A nuclear power plant conventional island main panel car device and a control method thereof

Abstract

A nuclear power conventional island main disc car device and a control method thereof relate to a nuclear power conventional island main disc car device and a control method thereof. The problem that the nuclear power conventional island main disc car is prone to tooth jamming and causes disc car input failure and affects the service life of the disc car is solved. The disc car motor output shaft drives the disc car device output shaft to rotate. The disc car pinion gear is sleeved on the disc car device output shaft. The disc car device output shaft is provided with a bearing seat. When the disc car pinion gear is disengaged from the disc car gear, the bearing seat and the disc car pinion gear form a closed oil cavity. The hydraulic control system controls the disc car pinion gear to move along the output shaft in the axial direction. The handle swings with the disc car pinion gear. The angular displacement sensor collects the angular displacement of the handle swing. The disc car gear is sleeved on the unit rotor shaft. The disc car pinion gear is driven by the hydraulic control system to move and engage with the disc car gear. The current transmitter is used to measure the real-time current signal of the disc car motor. The present application is suitable for the input use of the nuclear power conventional island main disc car.

Description

Technical Field

[0001] This invention relates to a main turning gear device for the conventional island of a nuclear power plant and its control method. Background Technology

[0002] Currently, the main turning gear unit in the conventional island of nuclear power plants is put into operation using soft-start control. When the turning gear is engaged, the turning gear motor is first soft-started. Under the control of the soft starter, the turning gear motor slowly increases its speed, causing the turning gear pinion to idle. The turning gear pinion moves axially under the action of hydraulic oil, and its end face is in contact with the end face of the turning gear large. The turning gear pinion rotates relative to the turning gear large. When the teeth of the turning gear pinion are directly aligned with the tooth grooves of the turning gear large, the turning gear pinion enters the turning gear large for a small displacement under the action of the continuous axial force provided by the hydraulic oil. At this time, the turning gear motor continues to run at a low speed. Due to the action of the stationary turning gear large, the turning gear pinion cannot make circular motion. The turning gear pinion will move axially relative to the turning gear large due to its internal helical spline structure and reach the fully meshed position. At this time, the turning gear motor increases its speed until the thyristors of the soft starter are fully turned on, and the motor operates at the mechanical characteristics of the rated voltage, achieving a smooth start. However, in rare cases, and with a certain probability, when the pinion moves axially and comes into contact with the end face of the large gear, the tooth edges of the pinion may come into contact with those of the large gear. The tooth edges may develop burrs and deformation due to the force, resulting in tooth jamming. When the burrs and deformation are too large, or accumulate excessively due to repeated engagements, the pinion may fail to mesh with the large gear, causing engagement failure. Even when tooth jamming occurs and the gears cannot successfully mesh, the gear motor continues to accelerate to its rated speed under logic control. During this process, the relative speed difference between the large and small gears increases, making meshing even more difficult. Under axial hydraulic pressure, "tooth sweeping" occurs, where the tooth edges of the pinion jam with multiple tooth edges of the large gear, causing significant deformation and wear on multiple teeth of the gear. Once the gears develop burrs or deformation, subsequent engagement becomes even more difficult. The collision of tooth edges further increases the burrs or deformation, and even if engagement is successful, there will be a brief period of jamming during gear meshing. Burrs or deformation on gears further reduce the probability of operation, eventually leading to failure of the turning gear and severely affecting its service life. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that the main turning gear of the conventional island of nuclear power plants is prone to jamming, which leads to the failure of turning gear engagement and affects the service life of the turning gear. The invention proposes a main turning gear device and its control method for the conventional island of nuclear power plants.

[0004] The nuclear power conventional island main turning gear device of the present invention includes a turning gear motor, a reduction gear pair, a turning gear output shaft, a turning gear pinion, a turning gear large gear, a bearing housing, a hydraulic circuit, a handle, an angular displacement sensor and a current transmitter;

[0005] The output shaft of the turning motor drives the output shaft of the turning device to rotate through a reduction gear pair. The turning pinion is sleeved on the output shaft of the turning device. The output shaft of the turning device is provided with an external helical spline, and the turning pinion is provided with an internal helical spline.

[0006] The output shaft of the turning device is also provided with a bearing seat. When the turning pinion and the turning gear are disengaged, the turning pinion and the bearing seat are inserted to form a closed oil chamber. The bearing seat is provided with an oil inlet and an oil outlet. The oil inlet and an oil outlet are connected to the hydraulic control system through a hydraulic oil circuit. The hydraulic control system is used to control the turning pinion to move axially along the output shaft.

[0007] The outer surface of the shaft head on one side of the pinion gear teeth of the rotary lobe is provided with a groove along the circumference, and one end of the handle is inserted into the groove via a shift fork;

[0008] The other end of the handle is movably connected to the housing via a bearing. When the small gear moves axially, the handle swings with the small gear.

[0009] The angular displacement sensor is used to collect the angular displacement of the handle's swing.

[0010] Below the small turning gear is a large turning gear, which is sleeved on the rotor shaft of the unit. The small turning gear moves and meshes with the large turning gear under the drive of the hydraulic control system.

[0011] The current transmitter is used to measure the real-time current signal of the turning gear motor.

[0012] Furthermore, the present invention also includes a controller, which uses the current signal output by the current transmitter to calculate the rate of change of the current of the turning motor in real time, and combines it with the handle angle signal output by the angular displacement sensor to determine whether the pinion of the turning gear is stuck during the meshing process, and then issues an alarm.

[0013] Furthermore, the present invention also includes a rotary encoder, which is used to acquire the angular displacement of the output shaft of the rotary motor and output the acquired angular displacement signal to the controller.

[0014] Furthermore, in this invention, the hydraulic control system includes an engagement valve, which is used to control whether the oil circuit supplies oil to the oil chamber.

[0015] Furthermore, in this invention, the angular displacement sensor is a Hall angle sensor.

[0016] The control methods for the main turning gear unit in the conventional island of a nuclear power plant include:

[0017] Step 1: The turning gear motor is controlled by frequency conversion control to engage the turning gear. The hydraulic control system supplies pressurized oil to the oil chamber, the turning gear pinion moves, and the handle swings. When the angle value of the angular displacement sensor is in [α1-1°, α2+1°], the rate of change of the current value output by the current transmitter is calculated in real time, and it is determined whether the rate of change of the current is greater than the threshold M, where M is 10A / s. α1 is the handle position angle value when the end faces of the turning gear pinion and the turning gear are in contact under hot conditions, and α2 is the handle position angle value when the end faces of the turning gear pinion and the turning gear are in contact under cold conditions.

[0018] Step 2: If the current change rate is less than the threshold M, the turning gear continues to engage. After the controller receives the turning gear engagement signal, it closes the engagement valve, and the frequency converter controls the turning gear motor to speed up to the rated speed of the turning gear, thus completing the turning gear engagement. If the current change rate is greater than the threshold M, it is determined that a gear jam has occurred, and step 3 is executed.

[0019] Step 3: Record the number of anomalies +1, and check if the number of anomalies equals 3;

[0020] Step 4: If the number of abnormalities is 3, stop the directional rolling stock and trigger an alarm to end the directional rolling stock commissioning; if the number of abnormalities is less than 3, proceed to Step 5.

[0021] Step 5: Close the engagement valve, stop the turning gear motor, and return to Step 1.

[0022] Furthermore, in this invention, the process of statically engaging the turning gear motor control using frequency conversion control in step one is as follows:

[0023] When the angle value of the angular displacement sensor is within the range of [α0, α2+1°], it is in the pinion engagement stage. The control motor rotates, causing the pinion speed to increase from zero to the low-speed threshold n. 11 And maintain a constant speed, the low speed threshold n 11 The range is 0.01-0.5 rpm; α0 is the handle position angle value when the crank is completely disengaged.

[0024] When the angle value of the angular displacement sensor is within the range of [α2+1°, α3], it belongs to the stage of sliding from the engagement of the pinion to the trigger engagement signal stage. The control motor speeds up the turning gear so that the rotational speed of the pinion increases to the intermediate speed threshold n. 21 And maintain a constant speed of operation, α3 is the handle position angle value when the handle is in the engaged position;

[0025] When the angle value of the angular displacement sensor is within the range of [α3, α3'], it belongs to the stage after triggering the engagement signal. The control motor speeds up to the rated speed, so that the pinion of the angular displacement sensor reaches the limit position. α3' is the angle value of the handle position when the handle is in the engagement limit position.

[0026] Furthermore, in this invention, the low-speed threshold is: n 1m =n 大齿轮 ·i1+n 0m m = 1 or 2, where 1 represents static and 2 represents dynamic, n 11 The low-speed threshold during static input, n 12 The low-speed threshold for dynamic input, i1 is the reduction ratio between the large and small gears of the turning gear, and n is the low-speed threshold. 大齿轮 The rotational speed of the large gear of the turning gear is when it is engaged; the rotational speed of the large gear is 0 when it is statically engaged. Static engagement n 01 The range is 0.01-0.5 rpm, with dynamic input n. 02 The range is 0.01-0.2 rpm;

[0027] Intermediate speed threshold of the pinion gear: n 2m =n 大齿轮 ·i1+n2, m=1 or 2, where 1 represents static and 2 represents dynamic, and n2 ranges from 1.5 to 3 rpm.

[0028] This invention monitors the angular displacement of the turning gear handle and the current of the turning gear motor simultaneously during the engagement of the pinion gear. It also monitors the rate of change of the turning gear current in the vicinity of the handle angle value corresponding to the contact state of the pinion and gear ends—that is, when the pinion and gear are about to mesh or have just meshed. If a sudden increase in current is detected, the controller receives a feedback signal, identifies a possible gear jamming during the turning gear engagement process, shuts off the hydraulic oil providing axial force, and waits for the pinion and gear to separate axially before re-engaging. If the turning gear fails to engage three times consecutively, the system alarms and shuts down, alerting on-site maintenance personnel for inspection. Maintenance personnel promptly grind burrs on the gears and address any minor gear deformations, reducing the probability of gear jamming and preventing the turning gear motor from continuing to accelerate and causing "gear sweeping" during engagement failures. This allows power plant personnel to promptly detect and address gear deformation or wear, extending the service life of the turning gear. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the turning gear;

[0030] Figure 2 This is a schematic diagram illustrating the principle of using an angular displacement sensor to reflect the state of the turning gear.

[0031] Figure 3 This is a schematic diagram showing the position of the large and small gear end faces when they are in contact under normal operating conditions.

[0032] Figure 4 This is a schematic diagram showing the top teeth of the large and small gears on the rotary table;

[0033] Figure 5This is a schematic diagram of the gear and handle positions during the operation of the gearbox. In the diagram, 40 represents the pinion fully disengaged, 41 represents the pinion engaged due to thermal expansion, 42 represents the pinion engaged due to cold, 43 represents the pinion engaged, 51 represents the large gear thermal expansion, 52 represents the large gear cold, 90 represents the handle position when fully disengaged, 91 represents the handle position when engaged due to thermal expansion, 92 represents the handle position when engaged due to cold, and 93 represents the handle position when engaged.

[0034] Figure 6 It is a graph showing the rotational speeds of the turning gear motor and pinion during the turning gear operation.

[0035] Figure 7 This is a flowchart of the control method for the turning gear. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0038] Specific Implementation Method 1: The following is combined with... Figures 1 to 6 This embodiment describes the main turning gear device for the conventional island of a nuclear power plant, which includes a turning gear motor 1, a reduction gear pair 2, a turning gear output shaft 3, a turning gear pinion 4, a turning gear large gear 5, a bearing housing 6, a hydraulic circuit 7, a handle 9, an angular displacement sensor 10, and a current transmitter.

[0039] The output shaft of the turning motor 1 drives the output shaft 3 of the turning device to rotate through the reduction gear pair 2. The turning pinion 4 is sleeved on the output shaft 3 of the turning device. The output shaft 3 of the turning device is provided with an external helical spline, and the turning pinion 4 is provided with an internal helical spline.

[0040] The output shaft 3 of the turning device is also provided with a bearing seat 6. When the turning pinion 4 is disengaged from the turning gear 5, it is inserted into the bearing seat 6 to form a closed oil chamber. The bearing seat 6 is provided with an oil inlet and outlet. The oil inlet and outlet are connected to the hydraulic control system through the hydraulic oil circuit 7. The hydraulic control system is used to control the turning pinion 4 to move along the output shaft axial direction.

[0041] The outer surface of the shaft head on one side of the pinion 4 of the rotary gear is provided with a groove along the circumference, and one end of the handle 9 is inserted into the groove through a shift fork;

[0042] The other end of the handle 9 is movably connected to the housing via a bearing. When the rotator pinion 4 moves axially, the handle 9 swings with the rotator pinion 4.

[0043] The angular displacement sensor 10 is used to collect the angular displacement of the swing of the handle 9;

[0044] Below the small turning gear 4, a large turning gear 5 is provided. The large turning gear 5 is sleeved on the rotor shaft of the unit. The small turning gear 4 moves and meshes with the large turning gear 5 under the drive of the hydraulic control system.

[0045] The current transmitter is used to measure the real-time current signal of the turning gear motor 1.

[0046] Furthermore, this embodiment also includes a controller, which uses the current signal output by the current transmitter to calculate the rate of change of the current of the turning motor 1 in real time, and combines it with the angle signal of the handle 9 output by the angular displacement sensor 10 to determine whether the turning pinion 4 is stuck during the meshing process, and then issues an alarm.

[0047] Furthermore, in this embodiment, a rotary encoder 8 is also included. The rotary encoder 8 is used to collect the angular displacement of the output shaft of the rotary motor 1 and output the collected angular displacement signal to the controller.

[0048] Furthermore, in this embodiment, the hydraulic control system includes an engagement valve, which is used to control whether the oil circuit supplies oil to the oil chamber.

[0049] In this embodiment, with the oil supply valve and oil supply pump in the hydraulic control system open, the engagement valve is opened, and the hydraulic control system supplies oil to the closed oil chamber formed by the turning pinion and the bearing seat. The oil pressure pushes the turning pinion to rotate along the helical spline, thereby realizing the axial movement of the turning pinion. Under the action of the continuous axial force provided by the hydraulic oil, the turning pinion engages with the turning gear by a small displacement. Due to the action of the stationary turning gear, it cannot make circular motion. The turning pinion will make axial movement relative to the turning gear due to the internal helical spline structure and reach the fully engaged position.

[0050] Furthermore, in this embodiment, the angular displacement sensor is a Hall angle sensor.

[0051] Specific Implementation Method Two: The method for controlling the main turning gear device of the conventional island of a nuclear power plant described in this implementation method is used to control the main turning gear device of the conventional island of a nuclear power plant as described in Specific Implementation Method One. The specific method includes:

[0052] Step 1: The gantry motor 1 is controlled by frequency conversion control to engage the gantry. The hydraulic control system supplies pressurized oil to the oil chamber, the gantry pinion 4 moves, and the handle 9 swings. When the angle value of the angular displacement sensor 10 is in [α1-1°, α2+1°], the rate of change of the output current value of the current transmitter is calculated in real time, and it is determined whether the rate of change of the current is greater than the threshold M, where M is 10A / s. α1 is the handle position angle value when the end faces of the gantry pinion 4 and the gantry gear 5 are in contact under hot conditions, and α2 is the handle position angle value when the end faces of the gantry pinion 4 and the gantry gear 5 are in contact under cold conditions.

[0053] Step 2: If the current change rate is less than the threshold M, the turning gear continues to engage. After the controller receives the turning gear engagement signal, it closes the engagement valve, and the frequency converter controls the turning gear motor to speed up to the rated speed of the turning gear, thus completing the turning gear engagement. If the current change rate is greater than the threshold M, it is determined that a gear jam has occurred, and step 3 is executed.

[0054] Step 3: Record the number of anomalies +1, and check if the number of anomalies equals 3;

[0055] Step 4: If the number of abnormalities is 3, stop the directional rolling stock and trigger an alarm to end the directional rolling stock commissioning; if the number of abnormalities is less than 3, proceed to Step 5.

[0056] Step 5: Close the engagement valve, control the turning gear motor 1 to stop running, and return to step 1.

[0057] Furthermore, in this embodiment, the process of controlling the turning gear motor 1 to engage the turning gear in step one using frequency conversion control is as follows:

[0058] When the angle value of the angular displacement sensor is within the range of [α0, α2+1°], it is in the pinion engagement stage. The control motor rotates, causing the pinion speed to increase from zero to the low-speed threshold n. 11 And maintain a constant speed, the low speed threshold n 11 The range is 0.01-0.5 rpm; α0 is the handle position angle value when the crank is completely disengaged.

[0059] When the angle value of the angular displacement sensor is within the range of [α2+1°, α3], it belongs to the stage of sliding from the engagement of the pinion to the trigger engagement signal stage. The control motor speeds up the turning gear so that the rotational speed of the pinion increases to the intermediate speed threshold n. 21 And maintain a constant speed of operation, α3 is the handle position angle value when the handle is in the engaged position;

[0060] When the angle value of the angular displacement sensor is within the range of [α3, α3'], it belongs to the stage after triggering the engagement signal. The control motor speeds up to the rated speed, so that the pinion of the angular displacement sensor reaches the limit position. α3' is the angle value of the handle position when the handle is in the engagement limit position.

[0061] Furthermore, in this invention, the low-speed threshold is: n 1m =n 大齿轮 ·i1+n 0m m = 1 or 2, where 1 represents static and 2 represents dynamic, n 11 The low-speed threshold during static input, n 12 The low-speed threshold for dynamic input, i1 is the reduction ratio between the large and small gears of the turning gear, and n is the low-speed threshold. 大齿轮 The rotational speed of the large gear of the turning gear is when it is engaged; the rotational speed of the large gear is 0 when it is statically engaged. Static engagement n 01 The range is 0.01-0.5 rpm, with dynamic input n. 02 The range is 0.01-0.2 rpm;

[0062] Intermediate speed threshold of the pinion gear: n 2m =n 大齿轮 ·i1+n2, m=1 or 2, where 1 represents static and 2 represents dynamic, and n2 ranges from 1.5 to 3 rpm.

[0063] This invention features a rotary encoder connected to the free shaft end of the turning motor, enabling more precise speed control. The turning pinion has a circular groove structure, and a fork at the end of the turning handle inserts into this groove. An angular displacement sensor is connected to the end of the turning handle's rotating shaft. The turning device can indirectly measure the position of the turning pinion and reflect the turning state through the angular displacement sensor. The turning device includes a data acquisition system that can collect data such as angular displacement and turning motor current. The device also includes a controller that utilizes a frequency converter to achieve frequency conversion control of the turning motor's speed.

[0064] When engaging the turning gear, the rotational speed of the pinion gear is controlled when it meshes with the large gear. By reducing the relative linear velocity between the large and small gears, the probability of engagement failure due to gear jamming is reduced in both static and dynamic engagement. During static engagement, the rotational speed of the pinion gear when it meshes with the large gear is an extremely small engagement speed n. 11 The range is 0.01-0.5 rpm. The rotational speed of the pinion gear during dynamic engagement is: n 12 =n 大齿轮 ·i1+n 02 , where n 02 The range is: 0.01-0.2 rpm, n 大齿轮 i1 represents the speed of the large gear when the dynamic turning gear is engaged, and i1 is the reduction ratio of the large and small gears of the turning gear.

[0065] To reduce setup time, the setup process can be divided into three stages, controlling the rotational speed of the turning gear motor. During static setup, the rotational speed of the pinion gear is controlled at a low-speed threshold n during the pinion meshing stage. 11After the pinion engages, it slides until the engagement signal is triggered, at which point the pinion speed is the intermediate speed threshold n. 21 After the engagement signal is triggered, the motor rapidly accelerates to the rated operating speed of the turning gear. During dynamic engagement, the turning gear motor speed can also be controlled in three stages using a frequency converter. This three-stage speed control ensures reliable turning gear engagement and allows the engagement action to be completed in a short time.

[0066] exist Figure 1 In the illustrated embodiment, the turning gear motor 1, the reduction gear pair 2, and the turning device output shaft 3 are connected in sequence. A turning gear pinion 4 is fitted on the outer side of the turning device output shaft 3. The turning gear pinion 4 has an internal helical spline and can slide axially on the turning device output shaft 3, which has an external helical spline. The reduction gear pair 2 generally has a large reduction ratio to meet the requirements of low-speed operation of the turbine rotor under turning conditions. The reduction gear pair 2 can be a worm gear drive or a multi-stage gear series drive. The multi-stage gear can be a parallel shaft gear drive or a combination of parallel shaft gears and bevel gears. A turning gear large gear 5 is installed on the rotor shaft below the turning gear pinion 4. The turning gear pinion 4 engages and disengages with the turning gear large gear 5 through sliding. When the turning is engaged, the engagement valve on the hydraulic circuit 7 opens, and the oil chamber is filled with oil, providing a sliding axial force for the turning gear pinion 4, causing it to move towards the engagement position. In the engaged state, the turning gear pinion 4 and the turning gear large gear 5 are fully engaged. In the disengaged state, the pinion gear 4 and the gear 5 of the turning gear are completely separated, maintaining a certain clearance. During turning operations, the pinion and gears are engaged, and the turning motor drives the rotor shaft to rotate at low speed, thereby eliminating rotor thermal bending. When turning is not required, such as during normal unit operation or start-up operation, the pinion and gears are disengaged, and the disengagement of the turning gear does not affect the unit's shaft system. A rotary encoder 8 is connected to the free shaft end of the turning motor 1, enabling more precise control of the turning motor speed.

[0067] exist Figure 2 In the illustrated embodiment, the pinion 4 of the turning gear has a circular groove structure. The fork at the end of the turning handle 9 is inserted into the groove of the pinion 4. As the pinion 4 slides, the turning handle 9 can swing left and right around the axis of its rotating shaft. An angular displacement sensor 10 is connected to the end of the axis of the rotating shaft of the turning handle 9. The protruding shaft of the angular displacement sensor 10 extends into the inner hole of the rotating shaft of the handle 9, and the end of the set screw holds the protruding shaft of the angular displacement sensor 10 in place. The housing of the angular displacement sensor 10 is connected to the fixed housing of the turning gear. When the handle 9 rotates, the protruding shaft of the angular displacement sensor 10 rotates simultaneously with the rotating shaft of the handle 9 at the same angle. The angular displacement of the swinging handle 9 can be measured by the angular displacement sensor 10, and the angular displacement value reflects the position of the pinion 4 of the turning gear.

[0068] exist Figures 3-4In the illustrated embodiment, the turning gear is engaged via frequency converter control. During static engagement, the turning gear motor operates at a low, uniform speed under the control of the frequency converter. The small turning gear rotates at a low speed, and its end face is pressed against the end face of the large turning gear under the continuous push of hydraulic oil, while it continues to rotate at a low speed. Normally, a portion of the end face of the small turning gear teeth 21 rests against the teeth 22 of the large turning gear, preventing gear jamming. In special cases, the edge of the small turning gear teeth 21 collides with the edge of the large turning gear teeth 22, affecting the engagement of the turning gear. When the small turning gear approaches the large turning gear, its speed v can be divided into a circular motion speed v1 and an axial motion speed v2. The magnitude of v1 depends on the turning gear motor speed, and the magnitude of v2 depends on the hydraulic oil pressure. The direction of the small turning gear speed v depends on the ratio of v1 to v2, a = arctan(v1 / v2). The smaller a is, the lower the probability of gear jamming. During static turning, the probability of gear jamming can be reduced by decreasing the rotational speed of the pinion when it engages with the gear, and by reducing the relative linear velocity between the large and small gears during engagement during dynamic turning, i.e., reducing v1. In this embodiment, the turning gear frequency converter can control the turning gear motor to run at a constant speed. During static operation, the rotational speed of the pinion when it engages with the large gear is controlled to be a minimum engagement speed n. 11 Dynamic turning gear engagement means starting the turning gear while the turbine rotor shaft is running. As the rotor coasts, its speed gradually decreases. Dynamic engagement of the turning gear occurs when the rotor speed falls below the rated turning gear speed. Because the rotor coasting speed gradually decreases during dynamic engagement, the linear velocity difference between the small and large turning gears gradually increases. Therefore, when the small turning gear is ready to engage, its relative speed to the large turning gear should be even lower. If the speed of the large gear is set to n when dynamic turning gear engagement is... 大齿轮 The pinion rotates at a speed of n. 11 If the reduction ratio of the large and small gears of the turning gear is i1, and the reduction ratio of the reduction gear pair is i2, then the rotational speed when the small gear of the turning gear is engaged is set to: n 11 =n 大齿轮 ·i1+n 01 The set speed of the geared motor is: nmotor = nspeed 11 •i2, the speed can be set via a frequency converter. Where n 01 The control accuracy of the turning motor under dynamic optimization and encoder operation needs to be considered.

[0069] exist Figures 5-6 In the illustrated embodiment, when the rotational speed of the pinion gear engaging the large gear is set to a low speed, the engagement time of the turning gear will be significantly extended, and the entire engagement action can take several minutes. During the engagement of the turning gear, after confirming that the pinion gear is engaged with the large gear, the rotational speed of the turning gear motor can be increased via a frequency converter, thereby accelerating the axial movement speed of the pinion gear and reaching the fully engaged position in a shorter time, and then turning at the rated speed.

[0070] When the turbine unit is in a cold state, the large gear of the turning gear is in the cold state position 52. At this time, when the end face of the small gear of the turning gear is in contact with the end face of the large gear, the small gear is in the cold state engagement position 42. The handle is in the cold state engagement position 92. Let the angular displacement sensor reading be α2 at this time. If the turbine rotor shaft undergoes thermal expansion after the unit starts running, when the thermal expansion reaches its maximum value, the large gear of the turning gear is in the thermal expansion position 51. At this time, when the end face of the small gear of the turning gear is in contact with the end face of the large gear, the small gear is in the thermal expansion engagement position 41. The handle is in the thermal expansion engagement position 91. Let the angular displacement sensor reading be α1 at this time. When the small gear of the turning gear is completely disengaged, its position is the completely disengaged position 40. The handle is in the completely disengaged position 90. Let the angular displacement sensor reading be α0 at this time. When the turning gear engagement signal is triggered after engagement, the position of the turning gear pinion is at pinion engagement position 43, and the handle is at engagement position 93. Let the angular displacement sensor reading be α3 at this time. When the turning gear pinion slides to its limit position, let the angular displacement sensor reading be α3', where α3'≈α3. From the above, it can be seen that during unit operation, regardless of whether it is in a cold state or any thermal expansion position, the angular displacement sensor reading range is within the [α1, α2] interval when the turning gears begin to mesh. Therefore, when the sensor reading reaches α2+1°, it is confirmed that the turning gear pinion has engaged the large gear, and no gear jamming occurred during engagement. The turning motor can then increase its speed, reducing the engagement time. That is, without gear jamming, the turning motor speed during the entire static engagement process is mainly divided into three segments: the first segment has an angle range of [α0, α2+1°], which is the pinion engagement stage. The turning motor increases its speed from zero to low speed and runs at a constant speed, controlling the turning gear pinion speed to a very small engagement speed n. 11 The second segment's angle range is [α2+1°, α3], which belongs to the stage after the pinion engages and slides to the trigger engagement signal. After the turning gear motor further increases its speed, it runs at a lower, uniform speed, controlling the turning gear pinion speed to a relatively small speed n. 21 The third segment has an angle range of [α3, α3'], which belongs to the stage after the trigger engagement signal. The turning motor quickly accelerates to the rated operating speed of the turning gear. When the turning gear pinion reaches its limit position and the angular displacement sensor reading is α3', the turning gear begins to drive the rotor shaft to rotate, and the angular displacement reading stabilizes at α3'.

[0071] Depending on the needs, the turning gear motor speed can also be controlled in three stages using a frequency converter during dynamic commissioning. This three-stage speed control ensures reliable turning gear commissioning and allows the commissioning action to be completed in a shorter time.

[0072] exist Figure 7 In the illustrated embodiment, the control method for static turning gear anti-jamming operation includes the following steps:

[0073] The turning gear is started using variable frequency control to activate the turning gear motor. Speed ​​adjustment is used to bring the pinion gear of the turning gear to a low-speed threshold n. 11 Engage the turning gear. Open the engagement valve to allow lubricating oil to provide axial thrust to the pinion gear, pushing its end face against the end face of the large gear. When the angle sensor value is within (α1-1°, α2+1°), calculate the rate of change of the current transmitter output current in real time and determine if the rate of change is greater than 10A / s. α1 is the handle position angle when the pinion gear 4 and the large gear 5 end faces are in contact under hot conditions, and α2 is the handle position angle when the pinion gear 4 and the large gear 5 end faces are in contact under cold conditions. If so, it is determined that a gear jamming has occurred, an alarm is triggered, the turning gear motor is stopped, and the hydraulic control system is stopped supplying oil to the oil chamber. If the rate of change of current is not greater than 10A / s, after the pinion gear is fully engaged, the turning gear control cabinet receives the turning gear engagement signal. At this time, close the engagement valve and use frequency converter start to accelerate the turning gear motor to the rated turning gear speed. Determine if the number of times the gear jamming has occurred has reached three. If so, issue another alarm and keep the turning motor and hydraulic control system in a stopped state. Otherwise, return to step one.

[0074] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A main turning gear device for the conventional island of a nuclear power plant, characterized in that, It includes a turning motor (1), a reduction gear pair (2), a turning device output shaft (3), a turning pinion (4), a turning gear (5), a bearing housing (6), a hydraulic circuit (7), a handle (9), an angular displacement sensor (10), and a current transmitter; The output shaft of the turning motor (1) drives the output shaft (3) of the turning device to rotate through the reduction gear pair (2). The turning pinion (4) is sleeved on the output shaft (3) of the turning device. The output shaft (3) of the turning device is provided with an external helical spline, and the turning pinion (4) is provided with an internal helical spline. The output shaft (3) of the turning device is also provided with a bearing seat (6). When the turning pinion (4) and the turning gear (5) are disengaged, the turning pinion (4) and the bearing seat (6) are inserted to form a closed oil chamber. The bearing seat (6) is provided with an oil inlet and outlet. The oil inlet and outlet are connected to the hydraulic control system through the hydraulic oil circuit (7). The hydraulic control system is used to control the turning pinion (4) to move along the output shaft axial direction. The outer surface of the shaft head on one side of the pinion gear (4) is provided with a groove along the circumference, and one end of the handle (9) is inserted into the groove through a shift fork; The other end of the handle (9) is movably connected to the housing via a bearing. When the slewing pinion (4) moves axially, the handle (9) swings with the slewing pinion (4). The angular displacement sensor (10) is used to collect the angular displacement of the swing of the handle (9); Below the small turning gear (4) is a large turning gear (5), which is sleeved on the rotor shaft of the unit. The small turning gear (4) moves and meshes with the large turning gear (5) under the drive of the hydraulic control system. The current transmitter is used to measure the real-time current signal of the turning gear motor (1); It also includes a controller, which uses the current signal output by the current transmitter to calculate the rate of change of the current of the turning motor (1) in real time, and combines the angle signal of the handle (9) output by the angular displacement sensor (10) to determine whether the turning pinion (4) is stuck during the meshing process.

2. The main turning gear device for the conventional island of a nuclear power plant according to claim 1, characterized in that, It also includes a rotary encoder (8), which is used to collect the rotational speed of the output shaft of the rotary motor (1) and output the collected rotational speed signal to the controller.

3. A main turning gear device for the conventional island of a nuclear power plant according to claim 1 or 2, characterized in that, The hydraulic control system includes a meshing valve, which is used to control whether the oil circuit supplies oil to the oil chamber.

4. The main turning gear device for the conventional island of a nuclear power plant according to claim 1, characterized in that, The angular displacement sensor (10) adopts a Hall angle sensor.

5. A method for controlling a turning gear, used to control the turning gear as described in claim 3, characterized in that, include: Step 1: The gantry motor (1) is controlled by frequency conversion control to start the gantry operation. The hydraulic control system supplies pressurized oil to the oil chamber, the gantry pinion (4) moves, and the handle (9) swings. When the angle value of the angular displacement sensor (10) is in [α1-1°, α2+1°], the change rate of the output current value of the current transmitter is calculated in real time, and it is determined whether the change rate of the current is greater than the threshold M, where M is 10A / s; α1 is the handle position angle value when the end face of the gantry pinion (4) and the gantry gear (5) is in contact under hot conditions, and α2 is the handle position angle value when the end face of the gantry pinion (4) and the gantry gear (5) is in contact under cold conditions. Step 2: If the rate of change of current is less than the threshold M, the turning gear continues to be engaged. After the controller receives the turning gear engagement signal, it closes the engagement valve and the frequency converter controls the turning gear motor to speed up to the rated speed of the turning gear, thus completing the turning gear engagement. If the rate of change of current is greater than the threshold M, it is determined that a jamming has occurred, and step three is executed; Step 3: Record the number of anomalies +1, and check if the number of anomalies equals 3; Step 4: If the number of abnormalities is 3, stop the directional rolling stock and trigger an alarm to end the directional rolling stock commissioning; if the number of abnormalities is less than 3, proceed to Step 5. Step 5: Close the engagement valve, control the turning motor (1) to stop running, and return to step 1.

6. The method for controlling the turning gear according to claim 5, characterized in that, In step one, the process of statically engaging the turning motor (1) using frequency conversion control is as follows: When the angle value of the angular displacement sensor is within the range of [α0, α2+1], it is in the pinion meshing stage. The control motor rotates, causing the pinion speed to increase from zero to the low-speed threshold n. 11 And maintain a constant speed, the low speed threshold n 11 The range is 0.01-0.5 rpm; α0 is the handle position angle value when the crank is completely disengaged; When the angle value of the angular displacement sensor is within the range of [α2+1, α3], it belongs to the stage of sliding from the engagement of the pinion to the trigger engagement signal stage. The control motor speeds up the turning gear so that the rotational speed of the pinion increases to the intermediate speed threshold n. 21 And maintain a constant speed of operation, α3 is the handle position angle value when the handle is in the engaged position; When the angle value of the angular displacement sensor is within the range of [α3, α3'], it belongs to the stage after triggering the engagement signal. The control motor speeds up to the rated speed, so that the pinion of the angular displacement sensor reaches the limit position. α3' is the angle value of the handle position when the handle is in the engagement limit position.

7. The method for controlling the turning gear according to claim 6, characterized in that, Low speed threshold: n 1m =n 大齿轮 ·i1+n 0m m = 1 or 2, where 1 represents static and 2 represents dynamic, n 11 The low-speed threshold during static input, n 12 The low-speed threshold for dynamic input, i1 is the reduction ratio between the large and small gears of the turning gear, and n is the low-speed threshold. 大齿轮 The speed of the large gear of the turning gear is when it is engaged; the speed of the large gear of the turning gear is 0 when it is statically engaged. (The static engagement value is n.) 01 The range is 0.01-0.5 rpm, with dynamic input n. 02 The range is 0.01-0.2 rpm; Intermediate speed threshold of the pinion gear: n 2m =n 大齿轮 ·i1+n2, m=1 or 2, where 1 represents static and 2 represents dynamic, and n2 ranges from 1.5 to 3 rpm.

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