Large hydro-generator rotor hoisting anti-collision method

Abstract

An anti-collision method for hoisting of a rotor of a large hydro-generator comprises the steps that a plurality of anti-collision devices are installed on the top end face of the rotor, and the multiple anti-collision devices are evenly distributed on the top end face of the rotor; when the rotor is hoisted and assembled, the wireless terminal module in each anti-collision device is only used for receiving a signal transmitted by the pressure sensor arranged on the anti-collision strip assembly of the anti-collision device; according to signal information received by the wireless terminal modules on the anti-collision devices installed at different positions of the rotor, the position where the gap between the rotor and the stator is too small can be known, when the gap between the rotor and the stator is too small, the pressure sensor is extruded, and when a set threshold value is exceeded, an alarm signal is sent out, and a real-time early warning function is achieved. When the pressure value detected by the pressure sensor exceeds the limit, it is proved that the rotor is hoisted unstably; and meanwhile, the anti-collision strip assembly is used for playing a physical protection role on the rotor, so that direct collision between the rotor and the stator is avoided. The detachable anti-collision device is adopted for anti-collision and early warning and is used for replacing an existing working mode that an insertion plate is drawn manually, the operation risk is reduced, qualitative judgment can be made on the collision position, quantitative judgment can be made on the collision force, and the working efficiency can be improved.

Description

[0001] This invention is a divisional application of "Anti-collision device and operation method for lifting rotor of large hydro-generator" (application number: 2023102369630; application date: 2023-03-13). Technical Field

[0002] This invention belongs to the field of anti-collision technology for generator rotor hoisting, and specifically relates to a method for anti-collision during the hoisting of large hydro-generator rotors. Background Technology

[0003] The rotor is an important component of the hydro-generator. During the maintenance of the hydro-generator in a hydropower station, it is necessary to lift out and reinstall the generator rotor. The rotors of the hydro-generators in large hydropower stations usually have large geometric dimensions and equipment tonnage, making the lifting operation difficult and risky.

[0004] For large hydro-generator units, the allowable clearance between the rotor and stator is relatively small during hoisting, requiring a certain level of alignment accuracy. Furthermore, any squeezing or collision between the rotor and stator during hoisting can cause serious equipment damage. Therefore, physical protection must be provided for the rotor and stator during hoisting to prevent direct squeezing or collision in the event of an accident.

[0005] Currently, during the hoisting and reinstallation of the generator rotor, manual plate insertion is mainly used for gap monitoring and collision protection between the stator and rotor. In this process, the maintenance team stands on the stator base with the plate. During rotor hoisting, the workers must continuously move the plate up and down to ensure sufficient distance between the rotor and stator. If the plate becomes stuck and cannot be moved, they immediately raise their hands and report the issue. After assessing whether the rotor has deviated from its direction, the crane team contacts the bridge crane operator for fine-tuning until the hoisting and / or reinstallation is completed. The shortcomings of this operation are: 1. Workers stand outside the stator without any protective measures, compromising their personal safety; 2. Relying on manual plate manipulation relies heavily on qualitative judgment by the operators, resulting in low efficiency. Therefore, existing anti-collision and collision warning measures need to be improved. Summary of the Invention

[0006] In view of the technical problems existing in the background art, the present invention provides a method for anti-collision during the hoisting of a large hydro-generator rotor, which uses a detachable anti-collision device for anti-collision and early warning, to replace the existing method of manually pulling out the insert plate. This not only reduces the operational risk, but also enables qualitative judgment of the collision location and quantitative judgment of the collision force, which helps to improve work efficiency.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for preventing collisions during the hoisting of a large hydroelectric generator rotor employs a collision prevention device, which includes a collision prevention strip assembly and a wireless terminal module. The method comprises the following steps: Multiple anti-collision devices are installed on the top surface of the rotor, and the multiple anti-collision devices are evenly distributed on the top surface of the rotor; During rotor hoisting and assembly, the wireless terminal module in each anti-collision device is only used to receive signals emitted by the pressure sensors installed on the anti-collision strip assembly of that device. By analyzing the signal information received by the wireless terminal modules on the anti-collision devices installed at different locations on the rotor, the location where the clearance between the rotor and stator is too small can be determined. When the gap between the rotor and stator is too small, the pressure sensor is squeezed. When the pressure exceeds the set threshold, the display screen connected to the server issues an alarm signal to realize the real-time early warning function. When the pressure value detected by the pressure sensor exceeds the limit, it proves that the rotor is not hoisted stably. At the same time, the anti-collision strip assembly is used to provide physical protection for the rotor and avoid direct collision between the rotor and the stator.

[0008] Preferably, the method for installing a single anti-collision device on the top surface of the rotor is as follows: Before the rotor is hoisted, place this anti-collision device on the top surface of the rotor. Adjust the installation posture of this anti-collision device by rotating the adjustment handle and the screw with handle so that the base plate is parallel to the top surface of the rotor, so as to ensure that the anti-collision strip assembly is perpendicular to the end surface of the rotor when it is inserted. The number of anti-collision strips to be installed is selected according to the height of the rotor, and several anti-collision strips are assembled into an anti-collision strip assembly; Install the anti-collision strip assembly. When the anti-collision strip assembly is inserted, the side with the adsorption magnet faces the outer cylindrical surface of the rotor. Adjust the installation position of this anti-collision device so that the adsorption magnet of the anti-collision strip assembly is adsorbed onto the outer cylindrical surface of the rotor. The guide rod is locked by a linear bearing with a locking box and the magnetic base switch is turned on, so that the anti-collision device is attached and fixed.

[0009] Preferably, the anti-collision device further includes a base, and a plurality of guide wheels are installed on the upright plate at the end of the base. Anti-collision strip assemblies are inserted between the plurality of guide wheels, and the anti-collision strip assemblies slide in cooperation with the guide wheels.

[0010] Preferably, the anti-collision strip assembly is composed of several anti-collision strips spliced ​​together, and adjacent anti-collision strips are detachably connected.

[0011] Preferably, the anti-collision strip has guide grooves on both sides that cooperate with the guide wheel, and an adsorption magnet and a pressure sensor are provided on the back of the anti-collision strip. The adsorption magnet is used to adsorb onto the outer cylindrical surface of the rotor; the contact of the pressure sensor protrudes from the surface of the anti-collision strip but is not higher than the adsorption surface of the adsorption magnet.

[0012] Preferably, the upper and lower ends of the anti-collision strip are respectively provided with a mortise and tenon, and two adjacent anti-collision strips are connected by a mortise and tenon joint, and the connection between the mortise and tenon is locked by a set screw.

[0013] Preferably, the anti-collision strip assembly is locked to the base by a locking member; a pressure sensor is provided on the anti-collision strip assembly; a rotor connection mechanism is provided at the other end of the base, the rotor connection mechanism being used for detachable installation on the top surface of the rotor.

[0014] Preferably, the rotor connection mechanism includes a universal adjusting foot connected to the base plate, and an adjusting handle is installed on the screw head of the universal adjusting foot. The adjusting handle is used to adjust the extension amount of the universal adjusting foot.

[0015] Preferably, the rotor connection mechanism further includes a switchable magnetic base, a shank screw, a tailstock plate, a guide rod, and a lockable box-type slider linear bearing. The lockable box-type slider linear bearing is mounted on the base and connected to the tailstock plate via the guide rod. A shank screw is provided on the tailstock plate and is connected to the switchable magnetic base.

[0016] Preferably, the pressure sensor and the wireless terminal module are electrically connected, and the wireless terminal module is mounted on the base. The wireless terminal module is used to receive the pressure signal from the sensor and transmit the pressure signal wirelessly to the router. The router is electrically connected to the server, and the server displays the pressure value on the screen for use by the crane operator as a reference for adjusting the rotor position and attitude during the hoisting process.

[0017] This patent can achieve the following beneficial effects: 1. This anti-collision device is detachable. When in use, multiple anti-collision devices are evenly distributed and installed on the top surface of the rotor along the outer circumference of the rotor. The number of anti-collision devices required is determined by the protection needs. The anti-collision device can not only prevent the stator and rotor from colliding with each other and causing damage to the stator or rotor, but also monitor the collision position and the magnitude of the collision force, so as to facilitate the staff to make appropriate adjustments.

[0018] 2. This anti-collision device is easy to disassemble, and the anti-collision strip assembly can be adaptively adjusted according to the height of the rotor, replacing the existing method of manually pulling out the insert plate and reducing the risk of operation. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural diagram of the anti-collision device of the present invention; Figure 2 This is a three-dimensional structural diagram of the anti-collision strip assembly of the present invention; Figure 3 This is a three-dimensional structural diagram of the anti-collision strip of the present invention; Figure 4This is a diagram illustrating the effect of the anti-collision device of the present invention in use.

[0020] In the diagram: Anti-collision device 3, base 301, universal adjusting foot 302, adjusting handle 303, linear bearing with locking box type slider 304, guide rod 305, tailstock plate 306, switch-type magnetic seat 307, screw with handle 308, guide wheel 309, set screw 310, wireless terminal module 311, anti-collision strip assembly 312, anti-collision strip 3121, set screw 3122, adsorption magnet 3123, pressure sensor 3124, tenon 31211, tenon 31212, guide groove 31213, slide 31214, stator 4, hoisting operation platform 5, rotor 6. Detailed Implementation Example 1: Preferred solutions include Figures 1 to 4 As shown, this method employs an anti-collision device, which includes a base 301, universal adjusting feet 302, adjusting handle 303, a linear bearing with locking box-type slider 304, guide rod 305, tailstock plate 306, switch-type magnetic base 307, shank screw 308, guide wheel 309, set screw 310, wireless terminal module 311, and anti-collision strip assembly 312. Multiple guide wheels 309 are mounted on the upright plate at one end of the base 301. Anti-collision strip assemblies 312 are inserted between the guide wheels 309, and the anti-collision strip assemblies 312 slide against the guide wheels 309. The anti-collision strip assemblies 312 are locked to the base 301 by locking components. A pressure sensor 3124 or a micro switch is installed on the anti-collision strip assembly 312. A rotor connecting mechanism is provided at the other end of the base 301.

[0021] In this embodiment, universal adjusting feet 302 are threadedly connected to both sides of the front end of the base plate 301. Adjusting handles 303 are installed on the screw heads of the universal adjusting feet 302. Rotating the adjusting handles 303 adjusts the extension amount of the universal adjusting feet 302. A locking box-type linear bearing 304 is mounted on the bottom surface of the rear end of the base plate 301. A guide rod 305 is installed inside the locking box-type linear bearing 304. A tailstock plate 306 is connected to the extended end of the guide rod 305. The tailstock plate 306 can be pushed and pulled to adjust its position within the stroke range of the guide rod 305. The locking wrench on the linear bearing 304 can lock the guide rod 305. The tail plate 306 is connected to the shank screw 308 by thread. The end of the shank screw 308 is connected to the switch magnetic base 307 through a T-slot. The base plate 301 is also equipped with a wireless terminal module 311. Several sets of guide wheels 309 are installed on both sides of the upright plate of the base 301. The anti-collision strip assembly 312 can be inserted from the top and guided by the guide wheels 309. After the anti-collision strip assembly 312 is inserted, it is locked by the set screw 310 installed on the upright plate of the base 301. Furthermore, the anti-collision strip assembly 312 is composed of several anti-collision strips 3121 spliced ​​together, with adjacent anti-collision strips 3121 being detachably connected. The anti-collision strips 3121 are provided with guide grooves 31213 on both sides that cooperate with the guide wheels 309. The back of the anti-collision strips 3121 is provided with an adsorption magnet 3123 and a pressure sensor 3124. The adsorption magnet 3123 is used to adsorb onto the outer cylindrical surface of the rotor 6. The contact of the pressure sensor 3124 protrudes from the surface of the anti-collision strip 3121 but is not higher than the adsorption surface of the adsorption magnet 3123.

[0022] In this embodiment, the anti-collision strip assembly 312 is composed of several anti-collision strips 3121 spliced ​​together. The required number of splices is determined by the required height of the rotor 6 to be protected. The two ends of the anti-collision strips 3121 have ball heads or other forms of mortise and tenon structures that can be used for splicing with each other. A set screw 3122 is installed at the splice of every two anti-collision strips to prevent the anti-collision strips 3121 from slipping off. Preferably, the upper and lower ends of the anti-collision strips 3121 are respectively provided with mortise grooves 31212 and tenons 31211. Two adjacent anti-collision strips 3121 are connected by mortise and tenon joints of mortise grooves 31212 and tenons 31211, and the connection between mortise grooves 31212 and tenons 31211 is locked by set screws 3122.

[0023] The anti-collision strip 3121 has guide grooves 31213 on both sides that mate with the guide wheel 309; the front side of the anti-collision strip 3121 has a sliding groove 31214 that mates with the set screw 310; and two ends of the back side of the anti-collision strip 3121 are equipped with adsorption magnets 3123. When the adsorption magnets 3123 at both ends of a single anti-collision strip 3121 are attracted to the outer cylindrical surface of the rotor 6, the adsorption force provided by the adsorption magnets 3123 is only used to generate the frictional force required to prevent the anti-collision strip 3121 from falling due to gravity. A micro switch or pressure sensor 3124 is mounted on the middle of the back of the anti-collision strip 3121 via a mounting groove. The contact of the micro switch or pressure sensor 3124 protrudes from the surface of the anti-collision strip 3121 but does not exceed the adsorption surface of the adsorption magnet 3123. The purpose is that if the gap between the rotor 6 and the stator 4 is too small during hoisting, the rotor 6 will press against the anti-collision strip assembly 312, the anti-collision strip 3121 will deform, and the contact of the micro switch or pressure sensor 3124 will contact the surface of the rotor 6 and activate, triggering a warning signal.

[0024] Furthermore, the pressure sensor 3124 is electrically connected to the wireless terminal module 311, which is mounted on the base 301. The wireless terminal module 311 is used to receive the pressure signal from the sensor and transmit the pressure signal wirelessly to the router. The router is electrically connected to the server, and the server displays the pressure value on the screen for use by the crane operator as a reference for adjusting the rotor position and attitude during the hoisting process.

[0025] In this embodiment, the pressure sensor is an L10j type pressure sensor. The wireless terminal module 311 is a Zigbee wireless terminal module. The pressure sensor outputs a 1~1.5mV / V signal. An HDO7mV signal isolation transmitter converts the mV signal into a standard 4~20mA signal before connecting it to the Zigbee wireless terminal module. The signal is then sent to the server via the wireless network for unified processing.

[0026] A method for preventing collisions during the hoisting of a large hydroelectric generator rotor includes the following steps: Step 1: Before hoisting the rotor 6, place the anti-collision device on the top surface of the rotor. Adjust the installation posture of the anti-collision device by rotating the adjusting handle 303 and the screw with handle 308 so that the base plate 301 is parallel to the top surface of the rotor 6, so as to ensure that the anti-collision strip assembly 312 is perpendicular to the end surface of the rotor 6 when it is inserted. Step 2: Select the number of anti-collision strips 3121 to be installed according to the height of rotor 6, and assemble several anti-collision strips 3121 into anti-collision strip assembly 312; Step 3: Install the anti-collision strip assembly 312. When the anti-collision strip assembly 312 is inserted, the side with the adsorption magnet 3123 faces the outer cylindrical surface of the rotor 6. Adjust the installation position of this anti-collision device so that the anti-collision strip assembly 312 and the adsorption magnet 3123 are adsorbed onto the outer cylindrical surface of the rotor 6. Step 4: Lock the guide rod 305 by locking the linear bearing 304 with locking box type slider and turn on the switch type magnetic base 307 to make the anti-collision device adsorb and fix it. Step 5: Following the operation methods of steps 1-4, install multiple anti-collision devices on the top surface of rotor 6. The multiple anti-collision devices are evenly distributed on the top surface of rotor 6. Step six: During the hoisting and assembly of rotor 6, the wireless terminal module 311 in each anti-collision device is only used to receive signals emitted by the pressure sensor installed on the anti-collision strip assembly 312 of that anti-collision device; by using the signal information received by the wireless terminal modules 311 on the anti-collision devices installed at different positions on rotor 6, the location where the gap between rotor 6 and stator 4 is too small can be determined. Step 7: When the gap between rotor 6 and stator 4 is too small, the pressure sensor is compressed. When the pressure exceeds the set threshold, the wireless terminal module 311 receives the pressure signal from the sensor and transmits it wirelessly to the router. The router is electrically connected to the server, and the server displays the pressure value on a screen for crane operators to use as a reference for adjusting the rotor position and attitude during hoisting. When the pressure threshold is exceeded, the display screen connected to the server issues an alarm signal to achieve a real-time early warning function. When the pressure value detected by the pressure sensor exceeds the limit, it indicates that the rotor hoisting is unstable. At the same time, the anti-collision strip assembly 312 provides physical protection for rotor 6 to prevent direct collision between rotor 6 and stator 4.

[0027] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be defined as the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for preventing collisions during the hoisting of a large hydro-generator rotor, characterized in that, An anti-collision device is employed, which includes an anti-collision strip assembly (312) and a wireless terminal module (311); the method includes the following steps: Multiple anti-collision devices are installed on the top surface of the rotor (6), and the multiple anti-collision devices are evenly distributed on the top surface of the rotor (6); When the rotor (6) is hoisted and assembled, the wireless terminal module (311) in each anti-collision device is only used to receive the signal emitted by the pressure sensor installed on the anti-collision strip assembly (312) of that anti-collision device; by the signal information received by the wireless terminal module (311) installed on the anti-collision device at different positions on the rotor (6), the location where the gap between the rotor (6) and the stator (4) is too small can be determined. When the gap between the rotor (6) and the stator (4) is too small, the pressure sensor is squeezed. When the pressure exceeds the set threshold, an alarm signal is issued to realize the real-time early warning function. When the pressure value detected by the pressure sensor exceeds the limit, it proves that the rotor is not hoisted stably. At the same time, the anti-collision strip assembly (312) is used to provide physical protection for the rotor (6) to avoid direct collision between the rotor (6) and the stator (4).

2. The method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 1, characterized in that: The method for installing a single anti-collision device on the top surface of the rotor (6) is as follows: Before the rotor (6) is hoisted, the anti-collision device is placed on the top surface of the rotor. The installation posture of the anti-collision device is adjusted by rotating the adjustment handle (303) and the screw with handle (308) so that the base plate (301) is parallel to the top surface of the rotor (6) to ensure that the anti-collision strip assembly (312) is perpendicular to the end surface of the rotor (6) when it is inserted. The number of anti-collision strips (3121) to be installed is selected according to the height of the rotor (6), and several anti-collision strips (3121) are assembled into an anti-collision strip assembly (312). Install the anti-collision strip assembly (312). When the anti-collision strip assembly (312) is inserted, the side with the adsorption magnet (3123) faces the outer cylindrical surface of the rotor (6). Adjust the installation position of this anti-collision device so that the adsorption magnet (3123) of the anti-collision strip assembly (312) is adsorbed onto the outer cylindrical surface of the rotor (6). The guide rod (305) is locked by a linear bearing (304) with a locking box and the switch of the magnetic base (307) is turned on, so that the anti-collision device is adsorbed and fixed.

3. The method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 2, characterized in that: The anti-collision device also includes a base (301), on which a plurality of guide wheels (309) are installed on the upright plate at the end of the base (301), and anti-collision strip assemblies (312) are inserted between the plurality of guide wheels (309), and the anti-collision strip assemblies (312) slide in cooperation with the guide wheels (309).

4. The method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 3, characterized in that: The anti-collision strip assembly (312) is composed of several anti-collision strips (3121) spliced ​​together, and two adjacent anti-collision strips (3121) are detachably connected.

5. The method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 4, characterized in that: The anti-collision strip (3121) has guide grooves (31213) on both sides that cooperate with the guide wheel (309). The back of the anti-collision strip (3121) is provided with an adsorption magnet (3123) and a pressure sensor (3124). The adsorption magnet (3123) is used to adsorb onto the outer cylindrical surface of the rotor (6). The contact of the pressure sensor (3124) protrudes from the surface of the anti-collision strip (3121) but is not higher than the adsorption surface of the adsorption magnet (3123).

6. The method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 5, characterized in that: The upper and lower ends of the anti-collision strip (3121) are respectively provided with a mortise (31212) and a tenon (31211). Two adjacent anti-collision strips (3121) are connected by a mortise and tenon joint of the mortise (31212) and the tenon (31211), and the connection between the mortise (31212) and the tenon (31211) is locked by a set screw (3122).

7. A method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 5, characterized in that: The anti-collision strip assembly (312) is locked to the base (301) by a locking member; a pressure sensor (3124) is provided on the anti-collision strip assembly (312); a rotor connection mechanism is provided at the other end of the base (301), which is used to be detachably installed on the top surface of the rotor (6).

8. A method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 7, characterized in that: The rotor connection mechanism includes a universal adjustment foot (302) connected to the base plate (301). The screw head of the universal adjustment foot (302) is equipped with an adjustment handle (303), which is used to adjust the extension amount of the universal adjustment foot (302).

9. A method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 8, characterized in that: The rotor connection mechanism also includes a switchable magnetic base (307), a shank screw (308), a tailstock plate (306), a guide rod (305), and a locking box type slider linear bearing (304). The locking box type slider linear bearing (304) is mounted on the base (301) and is connected to the tailstock plate (306) through the guide rod (305). The tailstock plate (306) is provided with a shank screw (308), which is connected to the switchable magnetic base (307).

10. A method for preventing collisions during the hoisting of a large hydro-generator rotor according to claim 1, characterized in that: The pressure sensor (3124) is electrically connected to the wireless terminal module (311), which is mounted on the base (301). The wireless terminal module (311) is used to receive the pressure signal from the sensor and transmit the pressure signal wirelessly to the router. The router is electrically connected to the server, and the server displays the pressure value on the screen for use by the crane operator as a reference for adjusting the rotor position and attitude during the hoisting process.

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