Repair device for steam turbine rotor journal

Abstract

The invention belongs to the technical field of nuclear power station steam turbine journal repairing, and particularly relates to a repairing device for a steam turbine rotor journal. The grinding device comprises a transition support, a grinding tool support, a grinding tool side edge guide mechanism, an axial moving mechanism and a planet wheel mechanism. The grinding tool support of a door type structure is connected with the transition supports on the two sides, the grinding tool support enables the planet wheel mechanism to rotate around the rotor, the grinding tool side edge guiding mechanism bases are fixed to the two sides of the grinding tool support, and the axial moving mechanism is connected with the grinding tool side edge guiding mechanism. Automatic grinding of the rotor journal is controlled, the service life of the journal face can be prolonged, damage of foreign matter to the journal face can be reduced or avoided to the maximum degree, and stable operation of a unit is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant turbine journal repair technology, specifically relating to a turbine rotor journal repair device. Background Technology

[0002] Nuclear power plant sites have journals of different sizes. During unit commissioning and production, defects such as excessive roughness of journals were found. Manual grinding has problems such as uneven grinding and low efficiency. Therefore, it is necessary to invent an automatic grinding and repair device for turbine rotor journals. Summary of the Invention

[0003] The purpose of this invention is to provide a repair device for turbine rotor journals, which controls the automatic grinding of rotor journals, thereby improving the service life of the journal surface and minimizing or avoiding damage to the journal surface caused by foreign objects, thus ensuring the stable operation of the unit.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A repair device for a turbine rotor journal includes a transition bracket, a grinding tool bracket, a grinding tool side guide mechanism, an axial movement mechanism, and a planetary gear mechanism. The grinding tool bracket, with a portal frame structure, is connected to the transition brackets on both sides. The grinding tool bracket causes the planetary gear mechanism to rotate around the rotor. The base of the grinding tool side guide mechanism is fixed on both sides of the grinding tool bracket. The axial movement mechanism is connected to the grinding tool side guide mechanism. The axial movement of the axial movement mechanism is achieved by the rotation of the grinding tool side guide mechanism driven by the grinding tool bracket.

[0006] The transition bracket includes a base plate, a support plate, and a connecting plate. Two transition brackets are placed on both sides of the journal, and the bottom is connected to the lower bearing pad with bolts. The support plates on both sides are connected to the grinding tool bracket with bolts, and the connection has a height adjustment function.

[0007] The grinding tool holder includes an aluminum alloy bracket, linear guide rail A, a speed-regulating motor, a servo motor, a speed-regulating motor drive belt, a servo motor drive toothed belt, a pulley, a driven shaft, a speed-regulating motor mounting plate, and a lead screw. The speed-regulating motor is fixed on the speed-regulating motor mounting plate and mounted on the aluminum alloy bracket via linear guide rails A on both sides. The servo motor is directly connected to the lead screw, which is connected to the extension plate below the speed-regulating motor mounting plate via a lead screw nut. The forward and reverse rotation of the servo motor drives the speed-regulating motor mounting plate to move back and forth. The driven shaft is mounted on the extension plate below the speed-regulating motor mounting plate via bearings. The speed-regulating motor drives the driven shaft to rotate via the speed-regulating motor drive belt, and the pulley rotates the planetary gear mechanism around the rotor via a hinged belt.

[0008] The side guide mechanism of the grinding tool includes an aluminum alloy part, a linear guide rail B, a ball screw, a transmission pulley, bearings, and a screw nut assembly. The aluminum alloy part is fixed to the linear guide rail B with bolts. The ball screw is mounted on the aluminum alloy part through two bearings. The servo motor drives the transmission pulley to rotate through the servo motor transmission toothed belt. The transmission pulley drives the ball screw to rotate. The screw nut assembly is moved horizontally through the linear guide rail B and the ball screw.

[0009] The axial movement mechanism includes an upper internal gear, a lower internal gear, and a support. The upper and lower internal gears are connected and fixed by positioning steps and bolts. The outer ring of the internal gear has four rows of gears, arranged symmetrically in pairs. A full-circle groove is left between each pair of gears for the planetary gear mechanism to be positioned by bearings. The internal gear is fixed to the support by fixing bolts. The support is connected to the screw and nut assemblies on the side guide mechanism of the two sets of grinding tools by bolts. The axial movement of the axial movement mechanism is achieved by the rotation of the ball screw driven by the servo motor. This ensures that the axial movement mechanism moves synchronously and smoothly on the journal with the servo motor, thereby controlling the entire device to grind back and forth within the designated area.

[0010] It also includes a locating ring, which is used when installing the upper and lower internal gears and is removed after installation.

[0011] It also includes 4 sets of tensioning wheels to ensure that the torque of the speed-regulating motor on the grinding tool holder is efficiently transmitted to the planetary gear mechanism through the flexible belt.

[0012] It also includes a left-right adjustment device to ensure that the entire device can be adjusted left and right when centered.

[0013] The planetary gear mechanism consists of an upper planetary gear mechanism and a lower planetary gear mechanism. The upper and lower planetary gear mechanisms are connected and fixed by positioning grooves, connecting parts and bolts to ensure that the concentricity of the upper and lower planetary gear mechanisms meets the requirements after connection. The planetary gear mechanism performs circular motion on the positioning step between the two rows of gears on the outer side of the inner gear of the axial moving mechanism through bearings.

[0014] Once the grinding area is determined, move the repair device to the starting position of the grinding area and press the zero button on the control interface to set this position as the 0 point of the axis. Move the repair device to the end point of the grinding area and record this data through the control interface as the end point of the automatic grinding axis. Set the automatic grinding speed and the number of grinding round trips to complete the specified number of grinding cycles in the designated area.

[0015] The beneficial effects achieved by this invention are as follows:

[0016] This invention solves the problem of uneven force during manual journal grinding by using a journal grinding and repair device, avoiding damage to the journal and protecting the integrity of the shaft body. Through the axial movement mechanism and planetary gear mechanism, different positions of the journal can be ground effectively, and the state of the journal can be observed as the axial movement mechanism moves. The planetary gear mechanism can stably output the grinding intensity, and the grinding intensity required for the journal can be set according to the needs, effectively solving the problem of positions that cannot be reached by manual grinding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the transition support of the present invention;

[0018] Figure 2 This is a schematic diagram of the grinding tool holder of the present invention;

[0019] Figure 3 This is a schematic diagram of the side guide mechanism of the grinding tool of the present invention;

[0020] Figure 4 This is a schematic diagram of the axial movement mechanism of the present invention;

[0021] Figure 5 This is a schematic diagram of the planetary gear mechanism of the present invention;

[0022] Figure 6 This is a schematic diagram (I) of the turbine rotor journal grinding tool of the present invention;

[0023] Figure 7 This is a schematic diagram (II) of the turbine rotor journal grinding tool of the present invention. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] A repair device for a turbine rotor journal includes a transition bracket 1, a grinding tool bracket 2, a grinding tool side guide mechanism 3, an axial movement mechanism 4, and a planetary gear mechanism 5.

[0026] The transition bracket 1 includes a base plate 1-1, a support plate 1-2, and a connecting plate 1-3. Two transition brackets are placed on both sides of the journal, and their bottoms are connected to the lower bearing pads via bolts. The support plates on both sides are bolted to the grinding tool bracket 2 for secure use, and the connection point is equipped with a height adjustment function.

[0027] The grinding tool bracket 2 includes an aluminum alloy bracket 2-1, two linear guide rails 2-2, one speed-regulating motor 2-3, one servo motor 2-4, one speed-regulating motor drive belt 2-5, two servo motor drive toothed belts 2-6, three pulleys 2-7, one driven shaft 2-8, a speed-regulating motor mounting plate 2-9, and a lead screw 2-10. The grinding tool bracket 2 has a portal frame structure and is connected to the two side transition brackets 1 by bolts, fixing the grinding tool above the journal. The speed-regulating motor 2-3 is fixed to the plate 2-9 and mounted on the aluminum alloy bracket 2-1 via the two side guide rails 2-2. The servo motor 2-4 is directly connected to the lead screw 2-10, which is connected to the extension plate below the plate via a lead screw nut. The forward and reverse rotation of the servo motor drives the plate forward and backward. The driven shaft 2-8 is mounted on the extension plate below the plate via bearings. The speed-regulating motor drives the driven shaft to rotate via the belt 2-5, and the pulley 2-7, via a hinged belt, causes the entire planetary gear mechanism 5 to rotate around the rotor.

[0028] The side guide mechanism 3 of the grinding tool comprises an aluminum alloy part 3-1, a linear guide rail 3-2, a ball screw 3-3, a transmission pulley 3-4, a bearing 3-5, and a screw-nut assembly 3-6. A set of turbine rotor journal grinding tools includes two sets of guide mechanisms. The base of the guide mechanism is fixed to both sides of the grinding tool bracket 2 by bolts. The aluminum alloy part 3-1 is fixed to the linear guide rail 3-2 by bolts, and the ball screw 3-3 is mounted on the aluminum alloy part 3-1 via two bearings 3-5. The servo motor 2-4 drives the transmission pulley 3-4 of the guide mechanism to rotate via the transmission belt 2-6. The transmission pulley 3-4 drives the ball screw 3-3 to rotate, which in turn drives the screw-nut assembly 3-6 to translate via the linear guide rail 3-2 and the ball screw 3-3.

[0029] The axial movement mechanism 4 includes an upper internal gear 4-1, a lower internal gear 4-2, a positioning ring 4-3, a left-right adjustment device 4-4, a tensioning wheel 4-6, and a bracket 4-8. The upper and lower internal gears 4-1 and 4-2 are connected and fixed via positioning steps and bolts 4-5. The outer ring of the internal gears has four rows of gears, arranged symmetrically in pairs, with a full-circle groove between each group of gears for positioning of the planetary gear mechanism via bearings. The positioning ring 4-3 is used for positioning during the installation of the upper and lower internal gears and must be removed after installation. The internal gears are fixed to the bracket 4-8 by fixing bolts 4-7. The bracket 4-8 is connected to the screw and nut assemblies 3-6 on the two sets of side guide mechanisms 3 by bolts. The axial movement of the axial movement mechanism is achieved by the rotation of the ball screw driven by a servo motor, ensuring that the axial movement mechanism 4 can move synchronously and smoothly on the journal following the servo motor, thereby controlling the entire tool to grind back and forth within a designated area. The mechanism also features four tensioning rollers 4-6 to ensure that the torque of the speed-regulating motor 2-3 on the grinding tool holder 2 is efficiently transmitted to the planetary mechanism 5 via the connecting belt. The device is equipped with a left-right adjustment mechanism 4-4 to ensure that the entire tool can be adjusted left and right when centered.

[0030] The planetary gear mechanism 5 consists of two parts, 5-1 and 5-2. The upper and lower planetary gear mechanisms are connected and fixed by positioning grooves, connectors, and bolts to ensure that the concentricity of the upper and lower half-ring planetary gear mechanisms meets the requirements after connection. Each set of planetary gear mechanisms 5 moves in a circular motion on the positioning step between the two rows of gears on the outer side of the internal gear of the axial movement mechanism 4 via bearings. Each journal repair device contains two sets of planetary gear mechanisms 5, and the two sets of planetary gears are arranged symmetrically on the left and right.

[0031] When installing the grinding tools on site, secure the transition brackets 1 on both sides with bolts. During use, the grinding tool bracket 2, the grinding tool side guide mechanism 3, and the upper half of the axial movement mechanism 4 are pre-connected and fixed together; simply connect and fix the grinding tool bracket 2 to the transition bracket 1. Slowly rotate the lower internal gear 4-2 downwards onto the lower bearing using the sling, and fix it to the upper internal gear 4-1 with bolts. The planetary gear mechanism 5 has an upper and lower ring structure. Slowly rotate the lower ring planetary mechanism to the underside of the rotor through the internal gear guide groove, then place the upper ring planetary mechanism on the upper side of the rotor. Finally, fix the upper and lower ring planetary gear mechanisms with connectors. Install the connecting belt through the rotor onto the planetary gear positioning groove, connecting them into a ring. Adjust the tension wheel to complete the installation of the connecting belt. Adjust the bolts on the planetary gears to adjust the tension of the sanding belt. Before connecting the power after installation, check the smoothness of the equipment by manually cranking the speed-regulating motor and the main screw handwheel.

[0032] The specific operation of the automated control is as follows: After installation, check the equipment for obvious jamming by hand-cranking the device before connecting the power. Through the control interface, rotate the corresponding axis to the grinding state. Once the grinding area is determined, use the hand-crank on the main screw to move the grinding device to the starting position of the grinding area. Press the zero button on the control interface to set this position as the 0 point of the axis. Then, use the hand-crank to move the grinding device to the end point of the grinding area. Record this data through the control interface as the end position of the automatic grinding axis. Set the automatic grinding speed and the number of grinding reciprocations, and press the start button to complete the specified number of grinding cycles in the designated area.

[0033] A repair device for turbine rotor journals includes a transition bracket, a grinding tool bracket, a grinding tool side guide mechanism, an axial movement mechanism, and a planetary gear mechanism. Through their coordinated use, this device can automatically grind and repair different journals, achieving precise and uniform grinding at various locations. Multiple metal mechanisms allow for the simultaneous installation of the transition bracket, grinding tool bracket, and grinding tool side guide mechanism, thus accommodating journal grinding needs. A gear structure efficiently transmits grinding torque to the planetary gear mechanism. The device can be adjusted according to the grinding and repair requirements of different journals, thereby satisfying the journal grinding needs.

Claims

1. A repair device for a steam turbine rotor journal, characterized in that: It includes a transition bracket, a grinding tool bracket, a grinding tool side guide mechanism, an axial movement mechanism, and a planetary gear mechanism. The gantry-type grinding tool bracket is connected to the transition brackets on both sides. The grinding tool bracket causes the planetary gear mechanism to rotate around the rotor. The base of the grinding tool side guide mechanism is fixed on both sides of the grinding tool bracket. The axial movement mechanism is connected to the grinding tool side guide mechanism. The axial movement of the axial movement mechanism is achieved by the rotation of the grinding tool side guide mechanism driven by the grinding tool bracket.

2. The turbine rotor journal repair device according to claim 1, characterized in that: The transition bracket includes a base plate, a support plate, and a connecting plate. Two transition brackets are placed on both sides of the journal, and the bottom is connected to the lower bearing pad with bolts. The support plates on both sides are connected to the grinding tool bracket with bolts, and the connection has a height adjustment function.

3. The turbine rotor journal repair device according to claim 1, characterized in that: The grinding tool holder includes an aluminum alloy bracket, linear guide rail A, a speed-regulating motor, a servo motor, a speed-regulating motor drive belt, a servo motor drive toothed belt, a pulley, a driven shaft, a speed-regulating motor mounting plate, and a lead screw. The speed-regulating motor is fixed on the speed-regulating motor mounting plate and mounted on the aluminum alloy bracket via linear guide rails A on both sides. The servo motor is directly connected to the lead screw, which is connected to the extension plate below the speed-regulating motor mounting plate via a lead screw nut. The forward and reverse rotation of the servo motor drives the speed-regulating motor mounting plate to move back and forth. The driven shaft is mounted on the extension plate below the speed-regulating motor mounting plate via bearings. The speed-regulating motor drives the driven shaft to rotate via the speed-regulating motor drive belt, and the pulley rotates the planetary gear mechanism around the rotor via a hinged belt.

4. The turbine rotor journal repair device according to claim 3, characterized in that: The side guide mechanism of the grinding tool includes an aluminum alloy part, a linear guide rail B, a ball screw, a transmission pulley, bearings, and a screw nut assembly. The aluminum alloy part is fixed to the linear guide rail B with bolts. The ball screw is mounted on the aluminum alloy part through two bearings. The servo motor drives the transmission pulley to rotate through the servo motor transmission toothed belt. The transmission pulley drives the ball screw to rotate. The screw nut assembly is moved horizontally through the linear guide rail B and the ball screw.

5. The turbine rotor journal repair device according to claim 4, characterized in that: The axial movement mechanism includes an upper internal gear, a lower internal gear, and a support. The upper and lower internal gears are connected and fixed by positioning steps and bolts. The outer ring of the internal gear has four rows of gears, arranged symmetrically in pairs. A full-circle groove is left between each pair of gears for the planetary gear mechanism to be positioned by bearings. The internal gear is fixed to the support by fixing bolts. The support is connected to the screw and nut assemblies on the side guide mechanism of the two sets of grinding tools by bolts. The axial movement of the axial movement mechanism is achieved by the rotation of the ball screw driven by the servo motor. This ensures that the axial movement mechanism moves synchronously and smoothly on the journal with the servo motor, thereby controlling the entire device to grind back and forth within the designated area.

6. The turbine rotor journal repair device according to claim 5, characterized in that: It also includes a locating ring, which is used when installing the upper and lower internal gears and is removed after installation.

7. The turbine rotor journal repair device according to claim 5, characterized in that: It also includes 4 sets of tensioning wheels to ensure that the torque of the speed-regulating motor on the grinding tool holder is efficiently transmitted to the planetary gear mechanism through the flexible belt.

8. The turbine rotor journal repair device according to claim 5, characterized in that: It also includes a left-right adjustment mechanism to ensure that the entire device can be adjusted left and right when centered.

9. The turbine rotor journal repair device according to claim 5, characterized in that: The planetary gear mechanism consists of an upper planetary gear mechanism and a lower planetary gear mechanism. The upper and lower planetary gear mechanisms are connected and fixed by positioning grooves, connecting parts and bolts to ensure that the concentricity of the upper and lower planetary gear mechanisms meets the requirements after connection. The planetary gear mechanism performs circular motion on the positioning step between the two rows of gears on the outer side of the inner gear of the axial moving mechanism through bearings.

10. The turbine rotor journal repair device according to claim 1, characterized in that: Once the grinding area is determined, move the repair device to the starting position of the grinding area and press the zero button on the control interface to set this position as the 0 point of the axis. Move the repair device to the end point of the grinding area and record this data through the control interface as the end point of the automatic grinding axis. Set the automatic grinding speed and the number of grinding round trips to complete the specified number of grinding cycles in the designated area.

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