Large hydro-generator rotor hoisting anti-collision device and operation method

Abstract

A large hydro-generator rotor hoisting anti-collision device and operation method, including base, the vertical plate of base end part is equipped with multiple guide wheels, multiple guide wheels are inserted with anti-collision strip assembly, anti-collision strip assembly and guide wheel sliding fit, and anti-collision strip assembly is locked with base through locking part;Pressure sensor is arranged on anti-collision strip assembly;The other end of base is provided with rotor connecting mechanism, and the rotor connecting mechanism is used for detachably installed on the top end surface of rotor.The detachable anti-collision device is used for anti-collision and early warning, which replaces the existing manual work mode of pulling out the plug, not only reduces the operation risk, but also makes qualitative judgment on the collision position and quantitative judgment on the collision force, which helps to improve the work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of generator rotor hoisting and collision prevention, and in particular relates to a large-scale hydro-generator rotor hoisting and collision prevention device and an operating method. Background Art

[0002] The rotor is an important component of the hydro-generator. During the maintenance of the hydro-generator in a hydropower station, the motor rotor needs to be lifted out and reinstalled. However, the rotors of the hydro-generators in large hydropower stations usually have large geometric dimensions and equipment tonnage, and their lifting operations are difficult and risky.

[0003] For large hydroelectric generator sets, the allowable clearance between the rotor and stator during hoisting is relatively small, requiring a certain level of alignment accuracy. Furthermore, any compression or collision between the rotor and stator during hoisting can cause serious equipment damage. Therefore, physical protection must be implemented during the hoisting process to prevent direct compression and collision between the rotor and stator in the event of an accident.

[0004] Currently, during the lifting and reinstallation of the generator rotor, manual inserts are primarily used to monitor the gap between the stator and rotor and provide collision protection. During this process, the maintenance and construction team carries inserts and stands on the upper surface of the stator. During the rotor lifting process, the construction personnel need to constantly move the inserts up and down to ensure sufficient clearance between the rotor and the stator. If they find that the inserts are stuck and cannot be moved, they immediately raise their hands and call for help. After determining that the rotor has deviated from its direction, the lifting team will contact the bridge crane operator to fine-tune the rotor until the lifting and / or reinstallation are completed. The shortcomings of the above operation process are: 1. The staff stand outside the stator, and no protective measures are taken around the stator, which makes the staff's personal safety unprotected; 2. The manual operation of the inserts relies mainly on the operator's qualitative judgment, and the operation efficiency is low. Therefore, it is necessary to improve the existing anti-collision measures and collision warning measures. Summary of the Invention

[0005] In view of the technical problems existing in the background technology, the large-scale hydro-generator rotor hoisting anti-collision device and operation method provided by the present invention adopts a detachable anti-collision device for anti-collision and early warning, which replaces the existing working method of manually pulling the plug plate. It not only reduces the operation risk, but also can make a qualitative judgment on the collision position and a quantitative judgment on the collision force, which helps to improve work efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A large hydro-generator rotor hoisting anti-collision device includes a base, a plurality of guide wheels are installed on the vertical plate at the end of the base, an anti-collision bar assembly is inserted between the plurality of guide wheels, the anti-collision bar assembly is slidably engaged with the guide wheels, and the anti-collision bar assembly is locked to the base by a locking piece; a pressure sensor is provided on the anti-collision bar assembly; a rotor connecting mechanism is provided at the other end of the base, and the rotor connecting mechanism is used to be detachably mounted on the top surface of the rotor.

[0008] In a preferred embodiment, the rotor connection mechanism includes a universal adjustment foot connected to the bottom plate of the base, and the screw head of the universal adjustment foot is equipped with an adjustment handle, and the adjustment handle is used to adjust the extension amount of the universal adjustment foot; the rotor connection mechanism also includes a switch-type magnetic seat, a screw with a handle, a tailstock plate, a guide rod and a linear bearing with a locking box-type slider, the linear bearing with a locking box-type slider is installed on the base, the linear bearing with a locking box-type slider is connected to the tailstock plate through a guide rod, and a screw with a handle is provided on the tailstock plate, and the screw with a handle is connected to the switch-type magnetic seat.

[0009] In the preferred solution, the anti-collision bar assembly is composed of several anti-collision bars, and two adjacent anti-collision bars are detachably connected. Guide grooves that cooperate with the guide wheels are provided on both sides of the anti-collision bar. An adsorption magnet and a pressure sensor are provided on the back of the anti-collision bar. The adsorption magnet is used to adsorb on the outer cylindrical surface of the rotor; the contacts of the pressure sensor protrude from the surface of the anti-collision bar but are not higher than the adsorption surface of the adsorption magnet.

[0010] In a preferred solution, the pressure sensor is electrically connected to a wireless terminal module, which is mounted on a base. The wireless terminal module is used to receive the pressure signal from the sensor and transmit the pressure signal wirelessly to a router. The router is electrically connected to a server, and the server visualizes the pressure value through a display screen, which is used by the lifting operator as a reference for adjusting the rotor position and attitude during the lifting process.

[0011] In a preferred solution, 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 the mortise and tenon, and the connection between the mortise and tenon is locked by a top screw.

[0012] A method for operating a large hydro-generator rotor hoisting anti-collision device comprises the following steps:

[0013] Step 1: Before hoisting the rotor, place the anti-collision device on the top surface of the rotor. Adjust the installation posture of the anti-collision device by rotating the adjustment handle and the screw with a handle so that the base plate is parallel to the top surface of the rotor to ensure that the anti-collision bar assembly is perpendicular to the rotor end surface when inserted;

[0014] Step 2: Select the number of anti-collision bars to be installed according to the height of the rotor, and assemble several anti-collision bars into an anti-collision bar assembly;

[0015] Step 3: Install the anti-collision bar assembly. When the anti-collision bar assembly is inserted downward, the side with the adsorption magnet is facing the outer cylindrical surface of the rotor. Adjust the installation position of the anti-collision device so that the adsorption magnet of the anti-collision bar assembly is adsorbed on the outer cylindrical surface of the rotor.

[0016] Step 4: Lock the guide rod with a locking box-type slider linear bearing and turn on the switch-type magnetic seat switch to allow the anti-collision device to be adsorbed and fixed;

[0017] Step 5: Install multiple anti-collision devices on the top surface of the rotor according to the operation methods of steps 1-4, and evenly distribute the multiple anti-collision devices on the top surface of the rotor;

[0018] Step 6: When the rotor is hoisted and assembled, the wireless terminal module in each anti-collision device is only used to receive the signal transmitted by the pressure sensor installed on the anti-collision bar assembly of the anti-collision device; the position where the gap between the rotor and the stator is too small can be known by the signal information received by the wireless terminal modules installed on the anti-collision devices at different positions of the rotor;

[0019] In step seven, when the gap between the rotor and stator is too small, the pressure sensor is squeezed. When the threshold is exceeded, a display screen connected to the server issues an alarm. This provides a real-time early warning function. When the pressure value detected by the pressure sensor exceeds the limit, it indicates that the rotor is not hoisted smoothly. The anti-collision bar assembly also provides physical protection for the rotor, preventing direct collision between the rotor and stator.

[0020] This patent can achieve the following beneficial effects:

[0021] 1. This anti-collision device has a detachable function. When in use, multiple anti-collision devices are evenly installed on the top surface of the rotor along the circumference of the outer edge of the rotor. The required number of anti-collision devices 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 collision force, so that the staff can make appropriate adjustments.

[0022] 2. The anti-collision device is easy to disassemble, and the anti-collision bar assembly can be adaptively adjusted according to the height of the rotor, replacing the existing method of manually pulling the plug plate, reducing the operation risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples:

[0024] Fig. 1 It is a three-dimensional structural diagram of the present invention;

[0025] Fig. 2 A three-dimensional structural diagram of the anti-collision strip assembly of the present invention;

[0026] Fig. 3 This is a three-dimensional structural diagram of the anti-collision strip of the present invention;

[0027] Fig. 4 This is an effect diagram of the present invention.

[0028] In the figure: anti-collision device 3, base 301, universal adjustment foot 302, adjustment handle 303, linear bearing with locking box-type slider 304, guide rod 305, tailstock plate 306, switch-type magnetic base 307, screw rod with handle 308, guide wheel 309, set screw 310, wireless terminal module 311, anti-collision bar assembly 312, anti-collision bar 3121, top screw 3122, adsorption magnet 3123, pressure sensor 3124, tenon 31211, tenon groove 31212, guide groove 31213, slide groove 31214, stator 4, lifting work platform 5, rotor 6. DETAILED DESCRIPTION

[0029] Example 1:

[0030] The preferred solution is Figs. 1 to 4 As shown, a large hydro-turbine generator rotor hoisting anti-collision device includes a base 301, a universal adjustment foot 302, an adjustment handle 303, a linear bearing 304 with a locking box-type slider, a guide rod 305, a tailstock plate 306, a switch-type magnetic base 307, a screw with a handle 308, a guide wheel 309, a set screw 310, a wireless terminal module 311, and an anti-collision bar assembly 312. A plurality of guide wheels 309 are mounted on the vertical plate at the end of the base 301, and anti-collision bar assemblies 312 are inserted between the plurality of guide wheels 309. The anti-collision bar assemblies 312 slide in conjunction with the guide wheels 309 and are locked to the base 301 via a locking member. A pressure sensor 3124 or a micro switch is provided on the anti-collision bar assembly 312. A rotor connection mechanism is provided at the other end of the base 301.

[0031] In this embodiment, universal adjustment feet 302 are connected to the front ends of the bottom plate of the base 301 by threads, and an adjustment handle 303 is installed on the screw head of the universal adjustment foot 302. The extension amount of the universal adjustment foot 302 can be adjusted by rotating the adjustment handle 303. A linear bearing 304 with a locking box-type slider is installed on the bottom surface of the rear end of the bottom plate of the base 301. A guide rod 305 is installed in the linear bearing 304 with a locking box-type slider. The protruding end of the guide rod 305 is connected to a tailstock plate 306. The tailstock plate 306 can be pushed and pulled to adjust its position within the travel of the guide rod 305. The locking wrench on the linear bearing 304 of the slider can lock the guide rod 305, and the tailstock plate 306 is connected to the screw rod 308 with a handle through a thread, and the end of the screw rod 308 with a handle is connected to the switch type magnetic base 307 through a T-shaped slot. A wireless terminal module 311 is also installed on the bottom plate of the base 301, and several groups of guide wheels 309 are respectively installed on both sides of the vertical plate of the base 301. The anti-collision bar assembly 312 can be inserted from the top and guided by the guide wheel 309. After the anti-collision bar assembly 312 is inserted, it is locked by the set screw 310 installed on the vertical plate of the base 301.

[0032] Furthermore, the anti-collision bar assembly 312 is composed of several anti-collision bars 3121, and the adjacent anti-collision bars 3121 are detachably connected. Guide grooves 31213 that cooperate with the guide wheel 309 are provided on both sides of the anti-collision bar 3121. An adsorption magnet 3123 and a pressure sensor 3124 are provided on the back of the anti-collision bar 3121. The adsorption magnet 3123 is used to adsorb on the outer cylindrical surface of the rotor 6; the contacts of the pressure sensor 3124 protrude from the surface of the anti-collision bar 3121 but are not higher than the adsorption surface of the adsorption magnet 3123.

[0033] In this embodiment, the anti-collision bar assembly 312 is composed of a plurality of anti-collision bars 3121, the number of which is determined by the desired height of the rotor 6. The ends of the anti-collision bars 3121 have ball joints or other mortise and tenon structures for interlocking, and a top screw 3122 is installed at the joint between each pair of anti-collision bars to prevent the anti-collision bars 3121 from slipping. Preferably, the top and bottom ends of the anti-collision bars 3121 are respectively provided with a mortise and tenon 31211. Adjacent anti-collision bars 3121 are connected by the mortise and tenon 31211, and the connection between the mortise and tenon 31211 is locked by the top screw 3122.

[0034] The two sides of the anti-collision strip 3121 are provided with guide grooves 31213 that cooperate with the guide wheel 309; the front side of the anti-collision strip 3121 is provided with a slide groove 31214 that cooperates with the set screw 310; adsorption magnets 3123 are installed at both ends of one side of the back side of the anti-collision strip 3121. 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 friction force required to prevent the anti-collision strip 3121 from falling due to gravity; A micro switch or pressure sensor 3124 is installed in the middle of the back of the anti-collision bar 3121 through an installation slot. The contact of the micro switch or pressure sensor 3124 protrudes from the surface of the anti-collision bar 3121 but is not higher than the adsorption surface of the adsorption magnet 3123. Its purpose is that once the gap between the rotor 6 and the stator 4 is too small during the lifting process, the rotor 6 will press onto the anti-collision bar assembly 312, the anti-collision bar 3121 will be deformed, and the contact of the micro switch or pressure sensor 3124 will contact the surface of the rotor 6, triggering the issuance of an early warning signal.

[0035] Furthermore, the pressure sensor 3124 is electrically connected to the wireless terminal module 311, and the wireless terminal module 311 is installed on the base 301; the wireless terminal module 311 is used to receive the pressure signal of the sensor and transmit the pressure signal wirelessly to the router, the router is electrically connected to the server, and the server visualizes the pressure value through the display screen, which is used by the lifting operator as a reference for the rotor position and posture adjustment during the lifting process.

[0036] In this embodiment, the pressure sensor is model L10j. The wireless terminal module 311 is a Zigbee wireless terminal module. The pressure sensor outputs a 1.5-1.5 mV / V signal. An HDO7mV signal isolation transmitter is used to convert the mV signal into a standard 4-20 mA signal. This signal is then connected to the Zigbee wireless terminal module and sent to a server via a wireless network for centralized processing. A method for operating a large hydro-turbine generator rotor hoisting anti-collision device includes the following steps:

[0037] 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 adjustment handle 303 and the screw with handle 308 so that the bottom plate of the base 301 is parallel to the top surface of the rotor 6 to ensure that the anti-collision bar assembly 312 is perpendicular to the end surface of the rotor 6 when inserted downward;

[0038] Step 2: Select the number of anti-collision bars 3121 to be installed according to the height of the rotor 6, and assemble several anti-collision bars 3121 into an anti-collision bar assembly 312;

[0039] Step 3: Install the anti-collision bar assembly 312. When the anti-collision bar assembly 312 is inserted downward, the adsorption magnet 3123 is installed with one side facing the outer cylindrical surface of the rotor 6. Adjust the installation position of the anti-collision device so that the adsorption magnet 3123 of the anti-collision bar assembly 312 is adsorbed on the outer cylindrical surface of the rotor 6.

[0040] Step 4: Lock the guide rod 305 by the linear bearing 304 with a locking box-type slider and turn on the switch-type magnetic seat 307 to allow the anti-collision device to be adsorbed and fixed;

[0041] Step 5: Install multiple anti-collision devices on the top surface of the rotor 6 according to the operating methods of steps 1-4. The multiple anti-collision devices are evenly distributed on the top surface of the rotor 6.

[0042] Step 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 transmitted by the pressure sensor installed on the anti-collision bar assembly 312 of the anti-collision device; through the signal information received by the wireless terminal module 311 on the anti-collision device installed at different positions of the rotor 6, the position where the gap between the rotor 6 and the stator 4 is too small can be known.

[0043] Step seven, when the rotor 6 and stator 4 gap is too small, the pressure sensor is extruded, when exceeding the set threshold, the wireless terminal module 311 is used for receiving the pressure signal of the sensor and transmitting the pressure signal to the router in a wireless manner, the router is electrically connected with the server, the server visualizes the pressure value through the display screen, which is used as a reference for the lifting operator to adjust the position and posture of the rotor during the lifting process. When the pressure threshold is exceeded, the display screen connected with the server sends an alarm signal; for realizing the real-time early warning function, when the pressure value detected by the pressure sensor exceeds the limit, it proves that the rotor lifting is unstable; at the same time, the anti-collision strip assembly 312 is used for physical protection of the rotor 6, avoiding direct collision between the rotor 6 and the stator 4.

[0044] The above-described embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application. The protection scope of the present application should be based on the technical solutions recited in the claims, including equivalent replacement solutions of the technical features recited in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A large hydro-generator rotor hoisting anti-collision device, characterized by: The invention comprises a base (301), a plurality of guide wheels (309) are mounted on a vertical plate at the end of the base (301), an anti-collision bar assembly (312) is inserted between the plurality of guide wheels (309), the anti-collision bar assembly (312) and the guide wheel (309) are slidably matched, and the anti-collision bar assembly (312) is locked with the base (301) via a locking member; a pressure sensor (3124) is provided on the anti-collision bar assembly (312); a rotor connecting mechanism is provided at the other end of the base (301), and the rotor connecting mechanism is used to be detachably mounted on the top surface of the rotor (6); a plurality of anti-collision devices are mounted on the top surface of the rotor (6), and the plurality of anti-collision devices are evenly distributed on the top surface of the rotor (6); The anti-collision bar assembly (312) is composed of a plurality of anti-collision bars (3121), and two adjacent anti-collision bars (3121) are detachably connected. Guide grooves (31213) that cooperate with the guide wheel (309) are provided on both sides of the anti-collision bar (3121). An adsorption magnet (3123) and a pressure sensor (3124) are provided on the back of the anti-collision bar (3121). The adsorption magnet (3123) is used to be adsorbed on the outer cylindrical surface of the rotor (6); and the contact of the pressure sensor (3124) protrudes from the surface of the anti-collision bar (3121) but is not higher than the adsorption surface of the adsorption magnet (3123).

2. The large hydro-generator rotor hoisting anti-collision device according to claim 1 is characterized in that: The rotor connection mechanism includes a universal adjustment foot (302) connected to the bottom plate of the base (301), an adjustment handle (303) is installed on the screw head of the universal adjustment foot (302), and the adjustment handle (303) is used to adjust the extension amount of the universal adjustment foot (302); the rotor connection mechanism also includes a switch type magnetic seat (307), a handle 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 installed on the base (301), the locking box type slider linear bearing (304) is connected to the tailstock plate (306) through the guide rod (305), the tailstock plate (306) is provided with a handle screw (308), and the handle screw (308) is connected to the switch type magnetic seat (307).

3. The large hydro-generator rotor hoisting anti-collision device according to claim 1 is characterized in that: The pressure sensor (3124) is electrically connected to the wireless terminal module (311), and the wireless terminal module (311) is mounted on the base (301); the wireless terminal module (311) is used to receive the pressure signal of the sensor and transmit the pressure signal to the router in a wireless manner. The router is electrically connected to the server, and the server visualizes the pressure value through a display screen, which is used by the lifting operator as a reference for adjusting the rotor position and posture during the lifting process.

4. The large hydro-generator rotor hoisting anti-collision device according to claim 1 is 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), and two adjacent anti-collision strips (3121) are connected by a mortise and tenon joint through the mortise (31212) and the tenon (31211), and the connection between the mortise (31212) and the tenon (31211) is locked by a top screw (3122).

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