Hydraulic generator thrust block machining device and machining method

Abstract

The invention relates to the technical field of machining, in particular to a hydro-generator thrust collar machining device and method, the machining device is used for machining a thrust collar of a hydro-generator, the machining device comprises a placing assembly, a rotating assembly and a machining assembly, and the machining assembly is arranged on a rotating platform and used for machining the thrust collar; a rigid supporting system is formed by the machining base and the fixing support, the fixing gear serves as an accurate transmission datum point, and when the driving part drives the rotating platform to rotate around the fixing gear, the position of the corresponding tool assembly can be adjusted so that machining can be conducted on the peripheral face of the thrust block at all angles, and machining precision is improved. That is, the machining cutter keeps synchronous displacement with the workpiece on the rotating platform, the relative position of the cutter system and the workpiece is kept constant through the structure, and positioning deviation generated by movement of the workpiece in traditional split equipment is eliminated. The problem that in the prior art, on-site machining of a thrust block of a hydro-generator cannot be achieved is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical processing, in particular to a water turbine generator thrust head processing device and processing method. BACKGROUND

[0002] During the operation of the water turbine generator, the thrust head plays a key role, which transmits force between the main shaft through the key and the snap ring, and the inner hole and the main shaft are fixed by interference fit to fix the rotation center, mainly bearing the weight of the rotating part of the unit and the axial water thrust, which is a heavy, complex and high-precision part.

[0003] Generally, the water turbine generator set needs to be overhauled after 6 to 8 years of operation, and the processing of the thrust head becomes an important link of the overhaul, because the cooperation accuracy of the thrust head and the mirror plate and other parts may decrease after a long time of operation, which affects the stability and operation efficiency of the unit.

[0004] At present, the processing of the thrust head generally adopts the way of returning to the factory for repair, which not only has high transportation cost, especially for large thrust heads, the volume and weight are considerable, the transportation process is complex and expensive, and the repair cycle is long, which often prolongs the downtime of the unit, brings adverse effects to the power supply, and causes huge economic losses.

[0005] In addition, there is also a situation of using simple methods such as manual grinding on site, but this method requires very high operation skills of personnel, and the processing accuracy is difficult to effectively guarantee, it is difficult to achieve the required flatness, parallelism and other technical standards, and it cannot meet the strict accuracy requirements of the thrust bearing for the thrust head, which may cause vibration and other problems during the operation of the unit, affecting its safe and stable operation. SUMMARY

[0006] The main purpose of the present application is to provide a water turbine generator thrust head processing device and processing method, which aims to solve the problem that the water turbine generator thrust head cannot be machined on site in the prior art.

[0007] To achieve the above purpose, the present application provides a water turbine generator thrust head processing device, which is used for processing the thrust head of a water turbine generator, and comprises: A placing assembly comprising a processing base and a fixed support, the processing base is connected with the fixed support, and a fixed gear is arranged on the fixed support; A rotating assembly comprising a rotating platform and a driving part, the rotating platform is rotationally arranged on the fixed gear, the driving part is fixedly arranged on the rotating platform, and the output end of the driving part is matched with the fixed gear, and the thrust head is arranged on the rotating platform; A machining assembly is arranged on the rotating platform and used for machining the thrust head.

[0008] Optionally, the machining assembly comprises a feeding motor, a machining tool and a feeding assembly, the feeding motor and the feeding assembly are arranged on the rotating platform, the output end of the feeding motor is connected with the feeding assembly, the machining tool is arranged on the feeding assembly, and the feeding assembly is used for adjusting the distance between the machining tool and the machining surface of the thrust head.

[0009] Optionally, the feeding assembly comprises a feeding platform and a feeding screw rod, the feeding platform is connected with the machining tool, one end of the feeding screw rod is connected with the feeding motor, and the other end of the feeding screw rod is connected with the feeding platform.

[0010] Optionally, the machining tool at least comprises one of a cutting tool head, a milling tool head and a grinding tool head.

[0011] Optionally, the device further comprises a limiting assembly, the limiting assembly is symmetrically arranged with the machining assembly with the central axis of the rotating platform as a reference, and the limiting assembly is used for balancing the deviation caused by the machining assembly when the machining assembly is used for machining.

[0012] Optionally, the limiting assembly comprises an elastic rod, one end of the elastic rod is abutted against the rotating platform, the other end of the elastic rod is provided with a roller, and the elastic rod is abutted against the outer circumferential surface of the thrust head through the roller.

[0013] Optionally, the device further comprises a centering assembly, the center of the rotating platform and the fixed support is provided with a recess, the bottom of the recess is provided with a limiting groove, the centering assembly comprises a centering turntable, a driving screw rod and a plurality of centering clamping jaws, the centering turntable is rotationally arranged in the recess, at least one vortex-shaped notch is formed in the centering turntable, the end portions of the plurality of centering clamping jaws are penetrated through the vortex-shaped notch and are matched with the limiting groove, a blind hole is arranged on the centering turntable, a thread matched with the screw rod is arranged on the inner wall of the blind hole, in the process of hoisting and lowering the thrust head, the thrust head is abutted against the end portion of the driving screw rod to drive the centering turntable to rotate in the recess, so as to drive the plurality of centering clamping jaws to slide towards the center of the centering turntable.

[0014] Optionally, when the centering turntable is provided with a plurality of vortex-shaped notches, the plurality of vortex-shaped notches are symmetrically arranged in a circumferential array with the central axis of the centering turntable as a reference.

[0015] Optionally, a reset spring is arranged in the blind hole, and the reset spring is connected with the end portion of the driving screw rod.

[0016] To achieve the above object, the application further provides a machining method of a thrust head of a hydroelectric generator, which comprises the following steps: Machining device assembly: the machining device is assembled according to the field environment; Machining device positioning: the thrust head is hoisted above the rotating platform and then lowered until the lower end surface of the thrust head abuts against the upper end of the driving lead screw, and the lowering is continued to drive the driving lead screw to rotate along its axis and drive the centering turntable to rotate in the groove and drive the plurality of centering claws to slide toward the center of the centering turntable; Machining operation completion: the machining assembly is started to complete the machining of the thrust head according to the set parameters.

[0017] The machining device and machining method of the thrust head of the hydroelectric generator provided by the application form a rigid support system by the machining base and the fixed support, and the fixed gear is used as an accurate transmission reference point, so that the position of the corresponding cutter assembly can be adjusted when the driving part drives the rotating platform to rotate around the fixed gear, so as to machine the periphery of the thrust head at each angle, that is, the machining cutter synchronously displaces with the workpiece on the rotating platform, so that the relative position between the cutter system and the workpiece is kept constant, and the positioning deviation caused by the movement of the workpiece in the traditional split equipment is eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of the machining device in embodiment 1 of the application; Figure 2 Fig. 2 is a front view of the machining device in embodiment 1 of the application; Figure 3 Fig. 3 is a partial structural schematic view of the machining device in embodiment 1 of the application; Figure 4 Fig. 4 is a structural schematic view of the centering assembly in embodiment 1 of the application; Figure 5 Fig. 5 is a flow schematic view of the machining method in embodiment 2 of the application.

[0019] REFERENCE SIGNS: 1-thrust head, 2-placing assembly, 3-rotating assembly, 4-machining assembly, 5-limiting assembly, 6-centering assembly; 21-machining base, 22-fixed support, 23-fixed gear; 31-rotating platform, 32-driving part; 41-feeding motor, 42-machining tool, 43-feeding assembly; 431-feeding platform, 432-feeding screw rod; 51-elastic rod, 52-roller; 61-centering rotary table, 62-driving screw rod, 63-centering claw, 64-groove, 65-limiting slot, 66-volute-shaped notch, 67-blind hole.

[0020] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work under the premise of the present application, belong to the protection scope of the present application.

[0022] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0023] In the present application, unless otherwise explicitly specified and limited, the terms “connection”, “fixation” and the like should be understood in a broad sense. For example, “fixation” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0024] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0025] Embodiment 1: Please refer to the accompanying drawings Figures 1 to 4 The machining device for machining the thrust head 1 of the hydraulic generator is provided in the embodiment, and the machining device comprises: The placing assembly 2 comprises a machining base 21 and a fixed support 22, the machining base 21 is connected with the fixed support 22, and the fixed support 22 is provided with a fixed gear 23; The rotating assembly 3 comprises a rotating platform 31 and a driving part 32, the rotating platform 31 is rotationally arranged on the fixed gear 23, the driving part 32 is fixedly arranged on the rotating platform 31, the output end of the driving part 32 is matched with the fixed gear 23, and the thrust head 1 is arranged on the rotating platform 31; The machining assembly 4 is arranged on the rotating platform 31 and is used for machining the thrust head 1.

[0026] It should be noted that in the hydraulic generator set, the thrust head 1 is often used with the mirror plate, the thrust head 1 and the main shaft are connected through the key and the snap ring, the inner hole and the main shaft are fixedly connected through the interference fit to fix the rotating center, and mainly bear the weight of the rotating part of the unit and the axial water thrust; and the mirror plate is fixed on the lower surface of the thrust head 1 through the inner and outer two circles of the bolt, and together with the thrust head 1 forms the rotating part of the thrust bearing, and the function is to transmit the axial load of the unit to the thrust pad.

[0027] It should be further noted that the water turbine generator thrust head 1 needs to be regularly maintained as a key component, and the traditional return factory repair mode has the disadvantages of high transportation cost and long repair cycle, and the on-site manual machining faces the problem of difficult precision control. The large thrust head 1 is difficult to move due to its volume and weight, and it is difficult to guarantee the flatness and parallelism requirements by manual grinding, which affects the stability of the unit operation.

[0028] Based on the above problems, a water turbine generator thrust head 1 machining device is proposed in the embodiment, which forms a rigid support system by the machining base 21 and the fixed support 22, and the fixed gear 23 is used as an accurate transmission reference point. When the driving part 32 drives the rotating platform 31 to rotate around the fixed gear 23, the position of the corresponding cutter assembly can be adjusted to machine the outer peripheral surface of the thrust head 1 at different angles. The machining cutter 42 on the rotating platform 31 keeps synchronous displacement with the workpiece, which keeps the relative position between the cutter system and the workpiece constant and eliminates the positioning deviation caused by the movement of the workpiece in the traditional split equipment.

[0029] Based on the above content, the on-site high-precision machining of the thrust head 1 is realized, the transportation link is saved, the maintenance cycle is shortened by more than 60%, the mechanical transmission system replaces manual operation, the parallelism of the machined surface is improved to within 0.03 mm, and the synchronous motion design of the rotating platform 31 and the machining cutter 42 improves the machining efficiency by 3 times.

[0030] Compared with the traditional factory repair or manual grinding method, the operation process of the machining device in the embodiment is simple and clear, and the on-site staff can master the operation method after simple training without complex operation skills and professional knowledge, which greatly reduces the requirements for the operator. In the machining process, the automatic control function of the control system can realize accurate operation and adjustment of the cutting device, reduce manual intervention, improve the consistency and stability of the machining, and make the on-site machining of the thrust head 1 more convenient and efficient.

[0031] The machining device in the embodiment adopts high-precision rotating platform 31 and cutting device, and through reasonable structure design and accurate control system, the cutting precision of the thrust head 1 plane can be guaranteed to reach a high level in the machining process; the cutting depth, feed amount and other parameters can be accurately controlled, so as to realize fine machining of the thrust head 1 plane, so that the flatness, parallelism and other precision indexes can meet the assembly requirements of the thrust bearing, effectively improve the working performance and reliability of the thrust bearing, and compared with the manual grinding method, the machining precision is significantly improved, which provides a strong guarantee for the stable operation of the water turbine generator.

[0032] The machining device in the embodiment adopts combined design, which has strong universality and adaptability. The size and parameters of the fixed support 22, rotating platform 31 and cutting device can be flexibly adjusted and configured according to different water turbine generator thrust heads 1, which can meet the machining requirements of thrust heads 1 of various types and specifications. Whether it is a large or small water turbine generator, as long as there is a demand for on-site machining of the thrust head 1, the device can quickly adapt and be put into use, which is not limited by the type of equipment and the site conditions, and has a wide range of applications.

[0033] The stable structure of the fixing support 22 can effectively prevent the rotor and the machining device from overturning or shaking during the machining process, and ensure the stability of the whole system during the operation process; the high-precision rotation and reliable protection measures of the rotating platform 31 can avoid personal injury to the operator caused by abnormal vibration or accidental splashing of the rotating part.

[0034] The machining device has the advantages of simple operation, high precision, strong applicability, high safety and the like, overcomes the problems of great repair difficulty, limited on-site machining conditions, long construction period, high cost and difficult to achieve precision standard by manual processing in the prior art, provides an efficient, high-quality and convenient solution for on-site machining of the thrust head 1 of the hydroelectric generator, has remarkable economic and social benefits, and is expected to be widely applied in the field of hydroelectric generator maintenance in China, effectively solves the pain point problem of machining of the thrust head 1 of the hydroelectric generator, and improves the maintenance efficiency and operation reliability of the hydroelectric generator.

[0035] In some embodiments, the machining base 21 refers to a rigid base for carrying the whole device, and can be specifically implemented by a welded steel structure frame, is fixed to the ground by anchor bolts, and provides stable support for the system.

[0036] In some embodiments, the fixed gear 23 refers to an annular gear ring fixed on the support, and can be specifically implemented by an alloy steel gear subjected to carburizing and quenching, and serves as a transmission reference of the rotating platform 31.

[0037] In some embodiments, the rotating platform 31 refers to a circular workbench with a slewing bearing, and can be specifically implemented by a double-row spherical slewing bearing structure, the inner ring of which is engaged with the fixed gear 23 to form a rotary pair, and correspondingly, a planetary gear set or a reducer and the like can also be matched to optimize power transmission.

[0038] In some embodiments, the driving part 32 refers to a transmission mechanism for driving rotation, and can be specifically implemented by a servo motor with a reducer, which drives the platform to rotate by engaging with the fixed gear 23 through a pinion.

[0039] In some embodiments, the rotating platform 31 is preferably a two-half combined structure, the lower flat plate is fixedly supported by the floor, and the upper end is used for fixing the gear ring and the rotating ring; when designing, it is necessary to ensure that the distance between the upper end surface and the mating surface of the thrust head 1 is uniform, and the distance difference around is less than 0.02 mm; the rotating platform 31 requires high-precision rotation performance, can realize stable speed control, and can maintain high flatness and concentricity during rotation; generally, high-precision slewing bearing devices such as large ball bearings or roller bearings are used to ensure the stability and precision of rotation; at the same time, the rotating platform 31 is also provided with a driving motor and a speed change system to meet the speed adjustment requirements under different machining requirements, and to ensure the smooth progress of the cutting process.

[0040] In other embodiments, the machining assembly 4 is flexibly adjusted according to the specific size and machining requirements of the thrust head 1, generally including a cutting motor, a milling and grinding tool, and a corresponding feeding mechanism, etc. The cutting motor provides sufficient power to drive the milling and grinding tool to rotate at high speed for cutting; and the feeding mechanism is used to accurately control the feeding amount of the tool in the vertical direction, so as to realize the step-by-step machining of the plane of the thrust head 1, and achieve the required machining depth and surface roughness requirements; in addition, the cutting device is also equipped with a cooling system and a chip removal device to timely remove heat and chips during machining, prevent heat accumulation from causing deformation of the thrust head 1 or aggravation of tool wear, and at the same time keep the machining area clean, which is conducive to improving the machining quality.

[0041] In actual operation, first, the device is installed and debugged in place, the thrust head 1 to be machined is fixed on the rotating platform 31, and then appropriate cutting tools and cutting process parameters are selected according to the material, size and required machining accuracy of the thrust head 1. Start the rotating platform 31 and the machining assembly 4, and through the accurate control of the control system, the cutting tool mills and grinds the plane of the thrust head 1. During the machining process, the machining condition can be monitored in real time, and the cutting parameters can be adjusted as needed to ensure that the machining quality of the thrust head 1 meets the matching requirements of the corresponding mirror plate.

[0042] In this embodiment, the machining assembly 4 includes a feeding motor 41, a machining tool 42 and a feeding assembly 43, the feeding motor 41 and the feeding assembly 43 are arranged on the rotating platform 31, the output end of the feeding motor 41 is connected with the feeding assembly 43, the machining tool 42 is arranged on the feeding assembly 43, and the feeding assembly 43 is used to adjust the distance between the machining tool 42 and the machining surface of the thrust head 1.

[0043] It can be understood that the feeding motor 41 is preferably connected with the feeding screw through a shaft coupling, and when the motor is started, the screw is rotated to drive the feeding platform 431 to move linearly along the guide rail. The machining tool 42 is rigidly fixed on the feeding platform 431, and its position is adjusted synchronously with the movement of the feeding platform 431. During the rotation of the thrust head 1 with the rotating platform 31, the distance between the machining tool 42 and the workpiece surface is monitored in real time by a closed-loop control system and fed back to the feeding motor 41, forming a dynamic position compensation mechanism. The synchronous rotation of the rotating platform 31 and the machining assembly 4 eliminates the relative position deviation caused by the rotation of the workpiece, so that the tool always maintains a predetermined contact pressure with the surface of the thrust head 1 during the machining process.

[0044] It can also be understood that based on the above structure, the continuous and accurate feeding of the machining tool 42 on the surface of the rotating workpiece is realized, and the unevenness or local overcut phenomenon of the machined surface caused by manual operation is avoided. During the machining process, the tool position can be controlled by programming to realize multi-axis linkage, significantly improving the machining efficiency of the mirror surface or mating surface of the thrust head 1, while ensuring that the flatness and parallelism error is controlled within 0.02 mm, meeting the precision requirements of the thrust bearing on the mating surface.

[0045] In the embodiment, the feeding assembly 43 comprises a feeding platform 431 connected with the machining tool 42 and a feeding screw 432 connected at one end with the feeding motor 41 and at the other end with the feeding platform 431.

[0046] When the feeding motor 41 is started, its output shaft drives the feeding screw 432 to rotate around its own axis. The threads of the screw and the threaded hole in the feeding platform 431 form a screw pair, which converts the rotary motion into the linear displacement of the platform. Since the pitch of the screw is set to a fixed value, a certain linear displacement of the platform is generated for each unit angle of rotation, for example, a screw with a pitch of 5 mm can move the platform 5 mm per revolution. The machining tool 42 is rigidly fixed on the platform and moves synchronously with the platform, thereby realizing accurate adjustment of the distance between the tool and the machining surface of the thrust head 1. The axial force generated during the screw transmission is borne by the platform guide, avoiding the screw bearing radial load and ensuring transmission accuracy.

[0047] In some embodiments, the feeding screw 432 is a transmission component that converts rotary motion into linear motion, which can specifically adopt a ball screw or trapezoidal screw structure, and the outer surface of the screw is processed with precise threads.

[0048] In the embodiment, the machining tool 42 at least includes one of a cutting tool head, a milling tool head, and a grinding tool head.

[0049] During the machining process of the thrust head 1, the cutting tool head first performs rough machining on the workpiece to quickly remove excess material; the milling tool head then performs precise milling on the machining surface to correct the flatness and parallelism error; and the grinding tool head finally performs grinding treatment on the surface to eliminate microscopic unevenness. Various tools are used in sequence or alternately according to the requirements of the machining stage, and the tool position is adjusted by the feeding assembly 43 to realize the completion of rough machining, semi-finishing and finishing processes in the same device.

[0050] In the embodiment, the device further comprises a limiting assembly 5 symmetrically arranged with the machining assembly 4 with the central axis of the rotating platform 31 as the reference, which is used to balance the deviation of the thrust head 1 caused by the machining of the machining assembly 4.

[0051] It should be noted that when the machining tool 42 exerts a cutting force on the thrust head 1, the elastic rod 51 absorbs machining vibration by deforming itself, and the roller 52 is in rolling contact with the outer circumferential surface of the thrust head 1. During the rotation of the rotary platform 31, the symmetrically distributed limiting assemblies 5 continuously generate a restraining force in the direction opposite to the force exerted by the machining tool 42, forming a dynamic balance system. The pre-tightening force of the elastic rod 51 can be adjusted, for example, by changing the compression amount of the elastic rod 51 through a threaded adjusting mechanism, so as to control the contact pressure of the roller 52 on the thrust head 1, and ensure that the effective restraint can be maintained when the cutting depth of the machining tool 42 changes. Further, the machining assembly 4 is prevented from causing unilateral feeding of the thrust head 1 during machining, thereby reducing the unilateral stress vibration of the rotary platform 31 and further reducing the machining error.

[0052] In the embodiment, the symmetric arrangement refers to arranging the same structure of the limiting unit at the opposite position of the machining assembly 4 with the rotary center line of the rotary platform 31 as the reference. Specifically, the symmetric angle can be determined by calculating the force exerted by the machining tool 42, and a restraining force field opposite to the direction of the cutting force is formed.

[0053] In the embodiment, the limiting assembly 5 includes an elastic rod 51, one end of the elastic rod 51 abuts against the rotary platform 31, the other end of the elastic rod 51 is provided with a roller 52, and the elastic rod 51 abuts against the outer circumferential surface of the thrust head 1 through the roller 52. It should be noted that through the above structure, the radial deviation of the thrust head 1 during machining can be effectively inhibited, the lateral force can be absorbed by elastic deformation and the frictional resistance can be reduced, the relative position stability between the machining tool 42 and the machining surface of the thrust head 1 is ensured, and thus the machining precision and the equipment operation reliability are improved.

[0054] In the embodiment, the device further includes a centering assembly 6, the center of the rotary platform 31 and the fixed support 22 is provided with a groove 64, the bottom of the groove 64 is provided with a limiting groove 65, the centering assembly 6 includes a centering turntable 61, a driving lead screw 62 and a plurality of centering clamping jaws 63, the centering turntable 61 is rotationally arranged in the groove 64, at least one spiral slot 66 is formed in the centering turntable 61, the end portions of the plurality of centering clamping jaws 63 penetrate through the spiral slot 66 and are matched with the limiting groove 65, a plurality of blind holes 67 are arranged on the centering turntable 61, and the inner wall of the blind hole 67 is provided with a thread matched with the lead screw. During the hoisting and lowering of the thrust head 1, the thrust head 1 abuts against the end portion of the driving lead screw 62 to drive the centering turntable 61 to rotate in the groove 64, so as to drive the plurality of centering clamping jaws 63 to slide towards the center of the centering turntable 61.

[0055] It should be noted that when the thrust head 1 is hoisted and lowered, the gravity thereof directly acts on the end of the drive screw rod 62, and drives the centering turntable 61 to rotate around the axis through the threaded pair. The spiral notch 66 is in sliding fit with the end of the centering claw 63, and the rotation of the centering turntable 61 forces the claw to synchronously contract along the track of the limiting groove 65 towards the center, so as to clamp the outer edge of the thrust head 1 to complete automatic centering. In this process, the gravity of the thrust head 1 is converted into a driving source, and the positioning action can be realized without external power device, and the radial contraction amount of the claw is determined by the spiral angle and the number of rotation of the spiral notch 66.

[0056] It should be further noted that in the process of lowering the thrust head 1, the self-triggering centering positioning is realized through mechanical linkage, and the synchronous contraction action of the claw can eliminate the concentricity deviation of the thrust head 1 and the rotating platform 31. The centering can be completed within 30 seconds without manual intervention, the positioning accuracy can be controlled within 0.05 millimeters, and it is particularly suitable for rapid and accurate positioning of large thrust head 1 with a diameter of more than 2 meters, and effectively avoids the secondary positioning error caused by manual adjustment.

[0057] In some embodiments, the groove 64 is preferably an annular recess structure arranged at the center of the rotating platform 31 and the fixed support 22, which can be realized by machining an inner cavity, for accommodating the centering turntable 61 and providing a rotating space.

[0058] In some embodiments, the limiting groove 65 is a guide rail arranged at the bottom of the groove 64, which can be realized by wire cutting to form a continuous closed annular groove, for constraining the radial movement track of the centering claw 63. The specific structure is a straight line type guide rail in cross shape, and the midpoint of the cross shape is on the central axis of the rotating platform 31.

[0059] In some embodiments, the spiral notch 66 is a involute type groove arranged on the surface of the centering turntable 61, which can be realized by numerical control milling to form an Archimedes spiral groove, for converting the rotary motion into synchronous radial displacement of the claw.

[0060] In some embodiments, the blind hole 67 is an unpenetrated hole arranged at the central axis of the centering turntable 61, which can be realized by drilling process to form a cylindrical cavity with internal threads, for forming a threaded pair with the drive screw rod 62 to transmit rotary torque.

[0061] In the present embodiment, when the centering turntable 61 is provided with a plurality of spiral notches 66, the plurality of spiral notches 66 are arranged in a circumferential array symmetrically with the central axis of the centering turntable 61 as a reference.

[0062] In addition, when the thrust head 1 is lowered, the driving screw 62 drives the centering turntable 61 to rotate, and the symmetrically distributed spiral notches 66 enable the clamping jaws to be synchronously displaced under the constraint of the groove, and since the notches are uniformly arranged along the circumference, the guiding forces acting on the clamping jaws during movement are equal in size and symmetric in direction, thereby avoiding the difference in movement speed of the clamping jaws caused by uneven distribution of the notches. Such symmetric arrangement enables the movement trajectory of the clamping jaw assembly to always remain radially symmetric with respect to the central axis, thereby eliminating the positioning deviation caused by unilateral force.

[0063] In some embodiments, it is preferable to arrange one notch every 120 degrees within a 360-degree range, so as to ensure that each notch has geometric symmetry with respect to the central axis and eliminate movement interference.

[0064] In the present embodiment, a reset spring is arranged in the blind hole 67 and connected to the end of the driving screw 62. The automatic reset of the driving screw 62 is realized by the elastic restoring force of the reset spring, thereby eliminating the manual intervention link.

[0065] Embodiment 2: As shown in the accompanying drawings, the present embodiment provides a processing method for a hydroelectric generator thrust head 1, and the processing method comprises the following steps: Figure 5 Processing device assembly: Assemble the processing device according to the site environment; Processing device positioning: After the thrust head 1 is hoisted above the rotating platform 31 and then lowered, the lower end surface of the thrust head 1 abuts against the upper end of the driving screw 62, and the driving screw 62 is continuously lowered to rotate along its axis, thereby driving the centering turntable 61 to rotate in the groove 64 and driving the plurality of centering clamping jaws 63 to slide toward the center of the centering turntable 61; Processing operation completion: Start the processing assembly 4 to complete the mechanical processing of the thrust head 1 according to the set parameters. It should be noted that the thrust head 1 is hoisted out and fixed on the support frame, so as to ensure that the upper surface of the thrust head 1 is at a height from the ground that is convenient for the operator to process; then the fixed support 22 is assembled with the processing base 21 and firmly fixed on the foundation base; then the fixed gear 23 is installed on the upper end of the fixed support 22; then the rotating platform 31 is placed on the fixed gear 23; in addition, a corresponding annular slide wire is arranged below the fixed gear 23 to provide power energy for the rotating platform 31; a planar sliding block is arranged between the rotating platform 31 and the fixed gear 23, so as to facilitate the rotating movement of the rotating platform 31, and the perpendicularity of the rotating platform 31 to the generator main shaft and the parallelism of the rotating platform 31 to the thrust head 1 can be adjusted by adjusting the height of the planar sliding block to meet the design requirements.

[0066]

[0067] ​Install the rotating platform 31, then install the driving part 32, the gear with the planetary reducer in the driving part 32 is engaged with the fixed gear 23; install the machining assembly 4 on the rotating platform 31; hoist the thrust head 1 above the rotating platform 31 and then lower it until the lower end surface of the thrust head 1 abuts against the upper end of the driving screw 62, and continue to lower it to the set position. Check and set the machining parameters, and control the machining device to complete the machining of the thrust head 1 on site.

[0068] In addition, in the above machining process, it is also preferred to use a laser tracker and a three-coordinate measuring instrument to detect the form and position tolerances of the thrust head 1 and determine the turning allowance (the single-sided allowance is usually ≤1mm).

[0069] In addition, in the above machining process, it also includes building a constant-temperature dustproof workshop (temperature 20±2℃, humidity ≤60%).

[0070] In some embodiments, a probe system is used to monitor the size in real time during work, a closed-loop feedback is used to compensate for machining errors, and an electronic level is used to scan the planeness of the machined surface according to a meter-shaped path.

[0071] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A water turbine generator thrust head machining device characterized by, The machining device is used for machining a thrust head of a hydroelectric generator, and comprises: The placing assembly comprises a machining base and a fixing support, the machining base is connected with the fixing support, and the fixing support is provided with a fixing gear; The rotating assembly comprises a rotating platform and a driving part, the rotating platform is rotationally arranged on the fixing gear, the driving part is fixedly arranged on the rotating platform, the output end of the driving part is matched with the fixing gear, and the thrust head is arranged on the rotating platform; The machining assembly is arranged on the rotating platform and is used for machining the thrust head.

2. A hydrogenerator thrust head machining device as claimed in claim 1, characterized in that The machining assembly comprises a feeding motor, a machining tool and a feeding assembly, the feeding motor and the feeding assembly are arranged on the rotating platform, the output end of the feeding motor is connected with the feeding assembly, the machining tool is arranged on the feeding assembly, and the feeding assembly is used for adjusting the distance between the machining tool and the machining surface of the thrust head.

3. A hydrogenerator thrust head machining device as claimed in claim 2, characterized in that The feeding assembly comprises a feeding platform and a feeding screw rod, the feeding platform is connected with the machining tool, one end of the feeding screw rod is connected with the feeding motor, and the other end of the feeding screw rod is connected with the feeding platform.

4. A hydrogenerator thrust head machining device as claimed in claim 2, characterized in that The machining tool comprises at least one of a cutting tool head, a milling tool head and a grinding tool head.

5. A hydrogenerator thrust head machining device as claimed in claim 1, characterized in that The device further comprises a limiting assembly, the limiting assembly is symmetrically arranged with the machining assembly based on the central axis of the rotating platform, and the limiting assembly is used for balancing the deviation of the machining assembly caused by machining.

6. A hydrogenerator thrust head machining device as claimed in claim 5, characterized in that The limiting assembly comprises an elastic rod, one end of the elastic rod is abutted against the rotating platform, the other end of the elastic rod is provided with a roller, and the elastic rod is abutted against the outer circumferential surface of the thrust head through the roller.

7. A hydrogenerator thrust head machining device as claimed in claim 1, characterized in that The device further comprises a centering assembly, the centers of the rotating platform and the fixing support are provided with a groove, the bottom of the groove is provided with a limiting groove, the centering assembly comprises a centering turntable, a driving screw rod and a plurality of centering clamping jaws, the centering turntable is rotationally arranged in the groove, at least one vortex-shaped notch is formed in the centering turntable, the end portions of the plurality of centering clamping jaws penetrate through the vortex-shaped notch and are matched with the limiting groove, a plurality of blind holes are arranged on the centering turntable, the inner walls of the blind holes are provided with threads matched with the screw rod, and in the process of hoisting and placing the thrust head, the thrust head is abutted against the end portion of the driving screw rod to drive the centering turntable to rotate in the groove and drive the plurality of centering clamping jaws to slide toward the center of the centering turntable.

8. A hydrogenerator thrust head machining device as claimed in claim 7, characterized in that When the centering turntable is provided with a plurality of vortex-shaped notches, the plurality of vortex-shaped notches are symmetrically arranged in a circumferential array based on the central axis of the centering turntable.

9. A hydrogenerator thrust head machining device as claimed in claim 7, characterized in that The blind holes are provided with return springs connected with the end portions of the driving screw rod.

10. A method of machining a thrust head of a hydroelectric generator, characterized by, The machining method is based on the machining device for a thrust head of a hydroelectric generator according to any one of claims 7 to 9, and the machining method comprises the following steps: Assembling the machining device according to the field environment; Processing device positioning: after lifting the thrust head above the rotating platform and lowering it, the lower end surface of the thrust head is in abutment with the upper end of the driving lead screw, and the driving lead screw is continuously lowered to rotate along its axis to drive the centering turntable to rotate in the groove to drive the plurality of centering clamping jaws to slide towards the center of the centering turntable; Processing operation completion: start the processing assembly to complete the machining of the thrust head according to the set parameters.

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