CN114770322A - Split replacing method for runner chamber of vertical hydraulic turbine unit and measuring and polishing device for runner chamber - Google Patents
Split replacing method for runner chamber of vertical hydraulic turbine unit and measuring and polishing device for runner chamber Download PDFInfo
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- CN114770322A CN114770322A CN202210564416.0A CN202210564416A CN114770322A CN 114770322 A CN114770322 A CN 114770322A CN 202210564416 A CN202210564416 A CN 202210564416A CN 114770322 A CN114770322 A CN 114770322A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/02—Frames; Beds; Carriages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
- G01B5/12—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters internal diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
- G01B5/201—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring roundness
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The method for replacing the rotating wheel chamber split of the vertical hydraulic turbine set and the rotating wheel chamber measuring and polishing device comprises the following steps: manufacturing a new runner chamber, sectioning and cutting the new runner chamber, processing the combined segments, preparing the segments before installation, installing the segments, grouting and pouring, measuring and polishing the new runner chamber. The method realizes the efficient replacement of the runner chamber and the maintenance of the inner wall of the runner chamber, and the parameters of the runner chamber are accurately controlled. The device comprises two cross-shaped supports, a rotating shaft, two flange bearings, two sets of adjusting parts, a rotating frame, two limiting studs, a measuring and polishing mechanism, four precise linear guide rails and a precise sliding block; a new runner chamber in the vertical water turbine set is in a non-contact state with a cross-shaped bracket, and the cross-shaped bracket is welded with a water guide vane bottom ring and a tail water pipe in the vertical water turbine set; through the adjusting piece, the axis of the rotating shaft is superposed with the central line of the new runner chamber, and the flange bearing is positioned; the measuring head and the polishing head of the angle grinder point to the inner wall of the new runner chamber. The device has reasonable structure and convenient use.
Description
Technical Field
The invention belongs to the technical field of maintenance of vertical hydraulic turbine units, and particularly relates to a split replacement method for a runner chamber of a vertical hydraulic turbine unit and a runner chamber measuring and polishing device.
Background
Hydroelectric power station hydroelectric set's structural style is more, wherein: the vertical water turbine set (also called vertical axial flow water turbine set) has high efficiency, stable and reliable operation and low failure rate, however, an underwater overflowing component positioned at the lower part of the vertical water turbine set is easy to generate cavitation erosion and difficult to maintain, the cavitation erosion is difficult to find and process in time, the vertical water turbine set can be carefully checked only when being overhauled and disassembled, the general overhaul period is more than three years, once the cavitation erosion occurs, the cavitation erosion becomes more and more serious, and the corresponding cavitation erosion component is easy to damage.
Generally, a runner chamber in a vertical water turbine unit is poured in a concrete pit, the runner chamber is made of carbon steel, and cavitation is easily generated in the runner chamber during operation of the vertical water turbine unit, so that a gap between the runner chamber and a runner blade in the runner chamber is too large, and the efficiency of the vertical water turbine unit is reduced. Slight cavitation of the runner chamber can be filled by adopting a composite material, but the runner chamber can only be integrally replaced when the cavitation of the runner chamber is serious.
The design parameters of the runner chamber comprise center, inner diameter, roundness, cylindricity and the like, and the control requirement on the design parameters of the runner chamber is higher; the gap between a runner chamber and runner blades in the vertical water turbine set is about 2mm generally, the vertical water turbine set also comprises a water guide blade bottom ring and a tail water pipe which are arranged at an upper and a lower interval, and the upper side and the lower side of the runner chamber are respectively welded with the water guide blade bottom ring and the tail water pipe.
After all relevant parts in the vertical hydraulic turbine unit are installed, the runner chamber cannot be integrally taken out of the machine pit, in other words: when the runner chamber is replaced, the runner chamber cannot integrally enter the corresponding mounting position. Therefore, a stable, reliable and accurate method for replacing the rotating wheel chamber of the vertical hydraulic turbine set by dividing the rotating wheel chamber and a matched rotating wheel chamber measuring and polishing device are urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a split replacement method for a runner chamber of a vertical hydraulic turbine unit, which ensures that efficient replacement of the runner chamber and maintenance of the inner wall of the runner chamber are realized, so that parameters of the runner chamber are accurately controlled.
The invention also aims to solve the technical problem of providing the rotating wheel chamber measuring and polishing device used in the sectioning replacement method, which has a reasonable structure and is convenient to use.
In order to solve the technical problem, the invention provides a method for replacing a runner chamber of a vertical hydraulic turbine unit by sections, which comprises the following steps:
s1 manufacturing a new runner chamber:
the new runner chamber is made of stainless steel plates by hot rolling, is in a cylindrical shape with openings at the upper side and the lower side, and is provided with a plurality of horizontally arranged annular ribs on the outer cylindrical surface after stress is eliminated according to the conventional technology; the height and the outer diameter of the new runner chamber refer to the design parameters of the original runner chamber, and the thickness of the stainless steel plate increases the grinding allowance according to the thickness of the original runner chamber;
s2 new runner chamber split cutting:
1) the new runner chamber is at least averagely divided into three sections, the chord length of each section is smaller than the inner diameter of the original runner chamber, the lines for sectioning are longitudinally divided on the inner cylindrical surface and the outer cylindrical surface of the new runner chamber, and the inner sectioning line and the outer sectioning line are on the same longitudinal cutting plane passing through the central line of the new runner chamber;
2) welding three connecting assemblies on two circumferential sides of each outer split line along the height direction of the new runner chamber, wherein the three connecting assemblies are respectively positioned at the upper side, the middle part and the lower side of the height direction of the new runner chamber, each connecting assembly comprises two connecting pieces which are circumferentially and symmetrically arranged along the corresponding outer split line, each connecting piece is respectively welded with the outer cylindrical surface of the new runner chamber and the upper side surface of the ring rib, and each connecting assembly is positioned by a positioning pin and then fastened by a bolt;
3) cutting along each inner sectioning line, sectioning the new runner chamber along the longitudinal direction and at least averagely dividing the new runner chamber into three sections;
4) fastening bolts in sequence, and tightly connecting and combining the at least three cut segments;
s3, processing the combined split body:
machining the inner cylindrical surface of the combined split bodies by using a lathe, controlling the inner cylindrical error of each split body to be less than 2mm, controlling the maximum inner diameter to be less than the design value of an original runner chamber, and welding a first support channel steel on the upper side and the lower side of each split body respectively;
preparation before installation of the S4 split:
a working platform which meets various safety protection measures is built in the original runner chamber; removing an original runner chamber according to the size of a new runner chamber, chiseling concrete on the periphery of the original runner chamber to a required pouring space, drilling a plurality of grouting holes in a water guide vane bottom ring connected with the upper side of the original runner chamber in a vertical hydraulic turbine set, wherein the grouting holes are communicated with the pouring space, the distance between every two adjacent grouting holes is less than one meter, and washing the pouring space clean by water;
s5 installing a split:
1) firstly, removing a bolt of each connecting assembly, successively hoisting at least three segments into the mounting position of the original runner chamber, matching any two adjacent segments according to the positioning pins, fastening the bolts of the corresponding connecting assemblies, and connecting and combining the new runner chamber again so that at least three vertically-arranged seams are formed on the inner cylindrical surface and the outer cylindrical surface of the new runner chamber in the circumferential direction; after rechecking the inner diameter deviation value of the new runner chamber, horizontally moving the new runner chamber to respectively expose each seam of the outer cylindrical surface, welding each seam from the outer cylindrical surface in sequence to enable the new runner chamber to be in place, and then dismantling the first support channel steel on each segment;
2) the center degree and the levelness of a new runner chamber are adjusted to meet the design requirements by taking the center connecting line of a water guide vane bottom ring and a tail water pipe in the vertical water turbine unit as a reference; after the adjustment is finished, the upper side and the lower side of the new runner chamber are respectively in spot welding with a water guide vane bottom ring and a tail water pipe in the vertical water turbine unit, four welding spots are uniformly distributed on the upper side and the lower side of the new runner chamber in the circumferential direction, after the welding is finished, the centrality and the levelness of the new runner chamber are measured, if the deviation is greater than the design requirement, the welding spots need to be removed, the welding is carried out again after the adjustment, and the welding needs to be carried out symmetrically;
3) after the new runner chamber is subjected to 12 hours, rechecking the corresponding parameters of the central degree and the levelness of the new runner chamber; if the two parameters are normal, respectively welding a second support channel steel for connection at the corresponding position between the upper side and the lower side of each two adjacent segments; if the two parameters are abnormal, repeating the step 2) of installing the split bodies in the step S5 until the two parameters are normal, and then respectively welding a second supporting channel steel with a connecting effect at the corresponding position between the upper side and the lower side of each two adjacent split bodies;
finally, completing the welding work of each seam on the inner cylindrical surface of the new runner chamber, wherein the welding work is also symmetrical;
s6 grouting and pouring:
adopting a commercially available non-shrinkage cement grouting material, and sequentially grouting and pouring through the plurality of grouting holes; two persons operate during grouting and pouring, one person performs grouting, and the other person performs repeated vibration by extending a vibration pump into a grouting area from an adjacent grouting hole, so that grouting and pouring are guaranteed to be compact; grouting and pouring the grouting holes in turn, and circularly performing grouting and pouring until the grout is discharged from the adjacent grouting holes; plugging a plurality of grouting holes after grouting and pouring are finished; after 72 hours, removing the second supporting channel steel between the upper sides and the lower sides of every two adjacent segments, cleaning a new runner chamber, and polishing all welding seams and all welding spots to be level;
s7 measuring and polishing the new runner chamber:
1) according to the height of the new runner chamber, a plurality of horizontal cross sections for horizontal measurement are set on the inner wall of the new runner chamber by a commercially available laser theodolite, and at least 16 measuring points are uniformly distributed in the circumferential direction of each horizontal cross section;
2) two cross-shaped brackets of the runner chamber measuring and polishing device are respectively arranged at corresponding positions higher than and lower than the new runner chamber, and the two cross-shaped brackets are respectively welded with the water guide vane bottom ring and the tail water pipe; a rotating shaft which is vertically arranged is arranged between the central areas of the two cross-shaped brackets, and the axis of the rotating shaft is adjusted to be superposed with the central connecting line by taking the central connecting line of a water guide vane bottom ring and a draft tube in the vertical water turbine unit as a reference; finally, the installation of the rotating wheel chamber measuring and polishing device is completed, and the set value of a measuring rod of a measuring mechanism in the rotating wheel chamber measuring and polishing device is adjusted according to the designed inner diameter of the new rotating wheel chamber;
3) measuring and recording the data of each measuring point by adopting the measuring mechanism point by point; for the area with the inner diameter smaller than the designed value range, a grinding mechanism in the rotating wheel chamber measuring and grinding device is adopted for grinding; for the area with the inner diameter larger than the designed value range, firstly filling the area with a stainless steel welding rod, and then polishing the area by adopting the polishing mechanism; when polishing, checking cylindricity and roundness by using a straight ruler and an arc template; the measurement and the polishing are repeatedly and continuously carried out until the inner diameter, the cylindricity and the roundness of the new runner chamber meet the requirements;
4) and (3) removing the rotating wheel chamber measuring and polishing device, rechecking whether the center line of the new rotating wheel chamber, the center connecting line of the water guide vane bottom ring and the tail water pipe are collinear, and cleaning the replacing site of the new rotating wheel chamber to complete the split replacement of the rotating wheel chamber of the vertical water turbine unit.
For the sake of brevity and clarity, the following method for replacing the rotor chamber of the vertical hydraulic turbine set by dividing the rotor chamber is simply referred to as the present method.
For the present method:
in the step S1 of manufacturing the new runner chamber, the new runner chamber is made of stainless steel plates, so that the cavitation resistance of the new runner chamber is improved, the cavitation resistance of the new runner chamber is very excellent, the problem of cavitation of the runner chamber is fundamentally solved, the cavitation damage area is ensured to be thoroughly replaced, and the service life of the vertical water turbine set is prolonged; a plurality of horizontally arranged annular ribs are arranged on the outer cylindrical surface of the new runner chamber, so that the deformation of the new runner chamber caused by heating is avoided; the thickness of the stainless steel plate increases the grinding allowance according to the thickness of the original runner chamber, and the requirement of the grinding allowance of a new runner chamber is ensured;
in step S2, in the step of sectioning and cutting the new runner chamber, the new runner chamber is at least averagely sectioned into three sections, and the chord length of each section is smaller than the inner diameter of the original runner chamber, so that each section can be fully ensured to be successfully hoisted and enter the corresponding position of the original runner chamber of the vertical hydraulic turbine set; the three connecting assemblies are welded on the two circumferential sides of the outer sectioning line along the height direction of the new runner chamber, each connecting assembly is positioned by a positioning pin and then fastened by a bolt, the connecting assemblies are cut along the inner sectioning line, and the new runner chamber is sectioned longitudinally to form at least three sectioning bodies, so that the deformation of the new runner chamber after being cut and sectioned can be avoided;
in the step S3 of machining the combined segments, the inner cylindrical surface of the combined segments is machined by a lathe, and the inner cylindrical error of each segment is controlled to be less than 2mm, and the maximum inner diameter is controlled to be less than the design value of the original runner chamber, so that a precisely adjustable grinding allowance is left for subsequent measurement and grinding of a new runner chamber; a first supporting channel steel is welded on the upper side and the lower side of each segment, so that the relevant parameters of a new runner chamber are ensured not to change in the transportation and hoisting processes;
in the step S5 of mounting the segments, a second supporting channel steel for connection is welded at the corresponding position between the upper side and the lower side of each two adjacent segments, so that the new runner chamber can be temporarily reinforced and the size is stable;
in the step S7, measuring and polishing the new runner chamber, repeatedly and continuously measuring, filling and/or polishing the new runner chamber by using the measuring mechanism and the polishing mechanism in the installed runner chamber measuring and polishing device until the inner diameter, cylindricity and roundness of the new runner chamber all meet the requirements, thus ensuring the realization of the overhaul of the inner wall of the runner chamber and accurately controlling the parameters of the runner chamber; and finally, removing the rotating wheel chamber measuring and polishing device, rechecking whether the center line of the new rotating wheel chamber, the center connecting line of the water guide vane bottom ring and the tail water pipe are collinear, and cleaning the replacement site of the new rotating wheel chamber, so that the split replacement of the rotating wheel chamber of the vertical water turbine unit can be completed.
Therefore, the method is suitable for replacing the original runner chamber, components such as the water guide vane bottom ring and the like on the upper side of the original runner chamber do not need to be removed, the replacement precision of the runner chamber is improved, the replacement workload of the runner chamber is saved, and the method has strong economical efficiency and practicability. Therefore, the method has the beneficial effects that: the efficient replacement of the runner chamber and the overhaul of the inner wall of the runner chamber are ensured, so that the parameters of the runner chamber are accurately controlled.
In order to solve the technical problem, the invention also provides a runner chamber measuring and polishing device used in the split replacing method, which comprises two horizontally-arranged and vertically-spaced cross-shaped brackets, a vertically-arranged rotating shaft, two horizontally-arranged flange bearings, two horizontally-arranged and vertically-spaced adjusting pieces, a vertically-arranged rotating frame, two horizontally-arranged and vertically-spaced limit studs, four vertically-arranged precise linear guide rails, four vertically-arranged precise sliding blocks, a horizontally-arranged measuring mechanism and a horizontally-arranged polishing mechanism;
a flange bearing and a set of adjusting parts for aligning the flange bearing are arranged in the central area of each cross-shaped support, each set of adjusting parts comprises four groups of adjusting bolts which are uniformly distributed along the circumferential direction of the cross-shaped support, each group of adjusting bolts penetrates through the cross-shaped support and is in threaded connection with the cross-shaped support, and the threaded end of each group of adjusting bolts is in contact with the outer cylindrical surface of the flange bearing;
the rotating shaft is correspondingly inserted and connected with the two flange bearings through the upper end and the lower end of the rotating shaft and then is arranged between the central areas of the two cross-shaped brackets;
the rotating frame is a transverse U-shaped flat frame, and the opening end of the rotating frame is arranged on the rotating shaft through two limiting studs;
two precision linear guide rails which are mutually spaced and parallel are arranged on each side of the thickness direction at the closed end of the rotating frame, and each precision linear guide rail is provided with a precision sliding block matched with the precision linear guide rail;
the two precise sliding blocks on one side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the measuring mechanism, the two precise sliding blocks on the other side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the polishing mechanism, so that the measuring mechanism is located on one side of the rotating frame in the thickness direction, the polishing mechanism is located on the other side of the rotating frame in the thickness direction, and the measuring mechanism and the polishing mechanism extend in the length direction of the rotating frame;
when this grinding device is measured with vertical hydraulic turbine group to runner room joins in marriage dress:
the mounting position of the upper cross-shaped bracket is higher than a new runner chamber in the vertical water turbine set, the mounting position of the lower cross-shaped bracket is lower than the new runner chamber, the new runner chamber is respectively in a non-contact state with the two cross-shaped brackets, and the two cross-shaped brackets are respectively welded with a water guide vane bottom ring and a tail water pipe in the vertical water turbine set;
the axis of the rotating shaft is superposed with the central line of the new runner chamber through two sets of adjusting pieces, and the flange bearing is positioned;
the measuring head of the measuring mechanism and the polishing head of the angle grinder of the polishing mechanism point to the inner wall of the new runner chamber.
For the sake of brevity and clarity, the rotating wheel chamber measuring and polishing device used in the above-mentioned split replacing method is simply referred to as the present device hereinafter.
In this device, measuring mechanism is located thickness direction one side of rotating turret, grinding machanism is located the thickness direction opposite side of rotating turret, and measuring mechanism and grinding machanism all extend along the length direction of rotating turret, measuring mechanism's measuring head, grinding machanism's angle mill head of polishing all points to the inner wall of the new runner room in the vertical hydraulic turbine unit, measuring mechanism, grinding machanism sets up ingeniously in the position, it is reasonable, only need 1 constructor, with the help of measuring mechanism, grinding machanism, can conveniently measure the construction to new runner room limit, the construction of polishing on the limit, therefore, this device's is rational in infrastructure.
The measuring principle of the device is the same as that of an electroacoustic loop measuring method, the device has high measuring precision, the measuring error is not more than 0.02mm, the measuring construction is simple and reliable, the measuring construction and the polishing construction are carried out simultaneously, and the measured relevant parameters (such as the inner diameter, the cylindricity and the roundness) of a new runner chamber can be read at any time; adopt this device, only need 1 constructor, its removal angle mill according to the indicated value of pilot lamp and percentage table, can conveniently measure the construction to new runner room limit, the construction of polishing simultaneously, only need can accomplish the measurement construction and the construction of polishing of new runner room in 2-3 days (nevertheless, if adopt bare-handed mode to carry out the measurement construction and the construction of polishing of new runner room, 3 constructors need 6-7 days time consuming, therefore, the efficiency of construction that the measurement of new runner room was polished has been improved by a wide margin, reduce the intensity of labour that the measurement of new runner room was polished by a wide margin, the control accuracy of new runner room correlation parameter has effectively been improved.
Therefore, the device has reasonable structure and convenient use.
Further, the measuring mechanism comprises a nylon seat, a measuring rod, a measuring head, a pressure spring, a limiting nut, a dial indicator touch plate, a clamping nut, an indicator light, a battery box, a dial indicator support, a support rod and a dial indicator;
the nylon seat and the measuring rod are both horizontally arranged;
the nylon seat is a cuboid with a horizontal step through hole in the interior, the length of the nylon seat is smaller than that of the measuring rod, and two precise sliding blocks on one side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the nylon seat;
setting the direction of the nylon seat, the step through hole and the measuring rod close to the closed end of the rotating frame as front, and setting the direction of the nylon seat, the step through hole and the measuring rod far away from the closed end of the rotating frame as back;
the measuring rod is sleeved with the nylon seat inside and outside by virtue of the step through hole, two ends of the measuring rod are positioned outside the nylon seat, external threads are arranged at the rear part of the measuring rod, and the measuring rod is in an electric insulation state with the rotating frame through the nylon seat;
the step through hole is formed by a small hole and a large hole which are communicated in the front and back and share the same axis, and an annular step surface is formed between the small hole and the large hole;
the indicator light, the battery box and the dial indicator support which are sequentially spaced from one another in the front-back direction are arranged on the outer side, away from the rotating frame, of the nylon seat;
the measuring head is arranged at the front end of the measuring rod, the limiting nut which is contacted with the rear end of the nylon seat is arranged in the middle of the measuring rod, and the dial indicator touch plate which is vertically arranged and extends towards the outer side of the nylon seat is arranged at the rear end of the measuring rod by virtue of the clamping nut which is screwed with the measuring rod;
the pressure spring is sleeved at the front part of the measuring rod, one end of the pressure spring is contacted with the step surface of the step through hole, and the other end of the pressure spring is contacted with the measuring head;
the branch that level was arranged and extended towards the percentage table touch panel is established on the percentage table support, and the percentage table is established at the end that branch kept away from the percentage table support, and the gauge outfit of percentage table contacts with the percentage table touch panel.
The measuring mechanism is reasonable in structure.
Further, the polishing mechanism comprises a vertical moving base, a linear guide rail arranged horizontally, a sliding block matched with the linear guide rail, a horizontal moving base, a plurality of clamps, an angle grinder, an adjusting nut, a spring and a connecting screw rod arranged horizontally;
setting the direction of the vertical moving base and the direction of the horizontal moving base close to the closed end of the rotating frame as front, and setting the direction of the vertical moving base and the direction of the horizontal moving base far away from the closed end of the rotating frame as back;
the vertical moving base and the horizontal moving base are both in a transverse L shape, the vertical moving base comprises a first front section and a first rear section which are connected in a front-back manner and have an included angle of 90 degrees, the horizontal moving base comprises a second front section and a second rear section which are connected in a front-back manner and have an included angle of 90 degrees, and the first rear section and the second rear section both extend towards the direction far away from the rotating frame;
the two precise slide blocks on the other side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the first front section of the vertical moving base;
the linear guide rail is arranged on the outer side, away from the rotating frame, of the first front section of the vertical moving base and is parallel to the rotating frame;
the front part of the second front section of the horizontal moving base is attached to the sliding block, the plurality of clamps are connected with the outer side, away from the rotating frame, of the second front section of the horizontal moving base, and the angle grinder is arranged on the outer side, away from the rotating frame, of the second front section of the horizontal moving base through the plurality of clamps;
the connecting screw rod penetrates through the first rear section of the vertical moving base and then is in threaded connection with the second rear section of the horizontal moving base, the rod body of the connecting screw rod, which is located between the first rear section and the second rear section, is sleeved with the spring and is screwed with the adjusting nut, and two ends of the spring are in contact with the first rear section and the adjusting nut.
The grinding mechanism is reasonable in structure.
Furthermore, the indicating lamp adopts a plurality of parallelly connected LED lamp pearls, and a section of 5# battery is assembled in the battery box. Thus, the indication reliability of the indicator lamp is improved
Further, the grinding tool of the angle grinder adopts an alloy grinding sheet. Therefore, dust pollution can be reduced, and the grinding efficiency can be improved.
Drawings
FIG. 1 is a process flow diagram of the present method.
Fig. 2 is a perspective view of the new runner chamber of the method after being split longitudinally into three split bodies.
Fig. 3 is a perspective view of the method of processing the assembled segments.
Fig. 4 is a perspective view of the method of installing the segments.
Fig. 5 is a perspective view of the present device.
Fig. 6 is another perspective view of the present device.
Fig. 7 is a perspective view of the apparatus and method with the new wheel chamber assembled.
Fig. 8 is a partially enlarged view of a portion a of fig. 7.
Fig. 9 is a schematic structural view of a measuring mechanism in the present apparatus.
Fig. 10 is a schematic view of the structure of the grinding mechanism in the present apparatus.
Fig. 11 is a schematic structural view of the device after the rotating shaft is respectively assembled with two cross-shaped brackets and a rotating frame.
In the drawings: 1. a new runner chamber; 1a, a ring rib; 1b, a split body; 2. a connecting member; 3a, a first support channel steel; a second support channel; 4. a rotating shaft; 5. a cross-shaped bracket; 6. adjusting the bolt; 7. a flange bearing; 8. a precision linear guide rail; 9. a measuring mechanism; 9a, a nylon seat; 9b. a measuring head; 9c, pressing a spring; 9d, an indicator light; 9e, a battery box; 9f, a dial indicator support; 9g, supporting rods; 9h, limiting the nut; 9i. a dial indicator; 9j, a dial indicator touch plate; 9k, clamping the nut; 9m. measuring rod; 9n. step through holes; 10. a rotating frame; 11. a polishing mechanism; 11a, a linear guide rail; 11b, a slide block; 11c, an angle grinder; 11d, a clamp; 11 da.u-shaped clips; 11db. locking screw; 11dc. wing nuts; horizontally moving the base; 11ea. second front section; 11eb. second rear section; adjusting the nut; 11g, a spring; vertically moving the base; 11ha. a first front section; 11hb. first rear section; 11i, connecting a screw rod; 12. a limiting stud; 13. and (4) a precision slide block.
Detailed Description
Referring to fig. 1-11, the method includes the steps of:
s1 preparation of new rotor chamber 1:
the new runner chamber 1 is made of stainless steel plates by hot rolling, is in a cylindrical shape with openings at the upper side and the lower side, and is provided with a plurality of horizontally arranged annular ribs 1a on the outer cylindrical surface after stress is eliminated according to the conventional technology; the height and the outer diameter of the new runner chamber 1 refer to the design parameters of the original runner chamber, and the thickness of the stainless steel plate increases the grinding allowance according to the thickness of the original runner chamber;
s2 new runner chamber 1 split cutting:
1) the new runner chamber 1 is averagely divided into three segments, the chord length of each segment 1b is smaller than the inner diameter of the original runner chamber, the lines for segmenting the segments are longitudinally divided on the inner cylindrical surface and the outer cylindrical surface of the new runner chamber 1, and the inner segment line and the outer segment line are on the same longitudinal cutting plane passing through the central line of the new runner chamber 1;
2) welding three connecting assemblies at two circumferential sides of each outer split line along the height direction of the new runner chamber 1, wherein the three connecting assemblies are respectively positioned at the upper side, the middle part and the lower side of the height direction of the new runner chamber 1, each connecting assembly comprises two connecting pieces 2 which are circumferentially and symmetrically arranged along the corresponding outer split line, each connecting piece 2 is respectively welded with the outer cylindrical surface of the new runner chamber 1 and the upper side surface of the annular rib 1a, and each connecting assembly is positioned by a positioning pin and then fastened by a bolt;
3) cutting along each inner sectioning line, sectioning the new runner chamber 1 along the longitudinal direction and averagely dividing the new runner chamber into three sectioning bodies 1 b;
4) then fastening bolts in sequence, and tightly connecting and combining the three cut split bodies 1 b;
s3, processing the combined segment 1 b:
machining the inner cylindrical surface of the combined split body 1b by using a lathe, controlling the inner cylindrical error of each split body 1b to be less than 2mm, controlling the maximum inner diameter to be less than the designed value of an original runner chamber, and welding a first support channel steel 3a on the upper side and the lower side of each split body 1b respectively;
s4 preparation before installation of segment 1 b:
a working platform which meets various safety protection measures is built in the original runner chamber; removing an original runner chamber according to the size of a new runner chamber 1, chiseling concrete on the periphery of the original runner chamber to a required pouring space, drilling a plurality of grouting holes in a water guide vane bottom ring connected with the upper side of the original runner chamber in a vertical hydraulic turbine set, wherein the grouting holes are communicated with the pouring space, the distance between every two adjacent grouting holes is less than one meter, and washing the pouring space clean by water;
s5 installation of segment 1 b:
1) firstly, removing a bolt of each connecting assembly, successively hoisting three split bodies 1b into the mounting position of the original runner chamber, matching any two adjacent split bodies 1b according to a positioning pin, fastening bolts of the corresponding connecting assemblies, and connecting and combining the new runner chamber 1 again so that three vertically-arranged seams are formed on the inner cylindrical surface and the outer cylindrical surface of the new runner chamber 1 in the circumferential direction; after the inner diameter deviation value of the new runner chamber 1 is rechecked, horizontally moving the new runner chamber 1 to respectively expose all seams of the outer cylindrical surface, welding all seams from the outer cylindrical surface in sequence to enable the new runner chamber 1 to be in place, and then dismantling the first support channel steel 3a on each segment 1 b;
2) the center degree and the levelness of the new runner chamber 1 are adjusted to meet the design requirements by taking the center connecting line of a water guide vane bottom ring and a tail water pipe in the vertical water turbine unit as a reference; after the adjustment is finished, the upper side and the lower side of the new runner chamber 1 are respectively in spot welding with a water guide vane bottom ring and a tail water pipe in the vertical water turbine unit, four welding spots are uniformly distributed on the upper side and the lower side of the new runner chamber 1 in the circumferential direction, after the welding is finished, the centrality and the levelness of the new runner chamber 1 are measured, if the deviation is greater than the design requirement, the welding spots need to be removed, the welding is carried out again after the adjustment, and the symmetrical operation is needed during the welding;
3) after the new runner chamber 1 is subjected to 12 hours, rechecking the corresponding parameters of the central degree and the levelness; if the two parameters are normal, respectively welding a second support channel steel 3b which plays a role in connection at corresponding positions between the upper side and the lower side of each two adjacent segments 1 b; if the two parameters are abnormal, repeating the step 2) of mounting the split body 1b in the step S5 until the two parameters are normal, and then respectively welding a second supporting channel steel 3b for connection at the corresponding positions between the upper side and the lower side of each two adjacent split bodies 1 b;
finally, completing the welding work of each seam on the inner cylindrical surface of the new runner chamber 1, wherein the welding work is also symmetrical;
s6 grouting and pouring:
adopting a commercially available shrinkage-free cement grouting material, and sequentially grouting and pouring through the plurality of grouting holes; two persons operate during grouting and pouring, one person performs grouting, and the other person performs repeated vibration by extending into a grouting area from an adjacent grouting hole through a vibration pump, so that grouting and pouring are guaranteed to be compact; grouting and pouring the grouting holes in turn, and circularly performing grouting and pouring until the grout is discharged from the adjacent grouting holes; plugging a plurality of grouting holes after grouting and pouring are finished; after 72 hours, removing the second supporting channel steel 3b between the upper side and the lower side of each two adjacent split bodies 1b, cleaning a new runner chamber 1, and polishing all welding seams and all welding spots to be level;
s7 measurement of the grinding new runner chamber 1:
1) according to the height of the new runner chamber 1, a plurality of horizontal cross sections for horizontal measurement are set on the inner wall of the new runner chamber 1 by a commercially available laser theodolite, and 16 measuring points are uniformly distributed on the circumference of each horizontal cross section;
2) two cross-shaped brackets 5 of the runner chamber measuring and polishing device are respectively arranged at corresponding positions higher than and lower than the new runner chamber 1, and the two cross-shaped brackets 5 are respectively welded with the water guide vane bottom ring and the tail water pipe; a rotating shaft 4 which is vertically arranged is arranged between the central areas of the two cross-shaped brackets 5, and the axis of the rotating shaft 4 is adjusted to be superposed with the central connecting line by taking the central connecting line of a water guide vane bottom ring and a draft tube in the vertical water turbine unit as a reference; finally, the installation of the rotating wheel chamber measuring and polishing device is completed, and the set value of a measuring rod 9m of a measuring mechanism 9 in the rotating wheel chamber measuring and polishing device is adjusted according to the design inner diameter of the new rotating wheel chamber 1;
3) measuring and recording the data of each measuring point by adopting the measuring mechanism 9; for the area with the inner diameter smaller than the designed value range, a grinding mechanism 11 in the rotating wheel chamber measuring and grinding device is adopted for grinding; for the area with the inner diameter larger than the designed value range, firstly filling the area with a stainless steel welding rod, and then polishing the area by adopting the polishing mechanism 11; when polishing, checking cylindricity and roundness by using a straight ruler and an arc template; the measurement and the polishing are repeatedly and continuously carried out until the inner diameter, the cylindricity and the roundness of the new runner chamber 1 meet the requirements;
4) and (3) removing the runner chamber measuring and polishing device, rechecking whether the connecting lines of the central line of the new runner chamber 1, the water guide vane bottom ring and the central line of the tail water pipe are collinear, and completing split replacement of the runner chamber of the vertical water turbine unit after cleaning the replacement site of the new runner chamber 1.
The non-shrinkage cement grouting material is characterized by comprising the following types: KK-52, manufacturer thereof: ningbo Huade New building materials Co. The vertical water turbine set, the water guide vane bottom ring, the primary runner chamber, the tail water pipe, the pouring space, the grouting hole and the working platform are not shown in the attached drawings; the working platform is a conventional technical part (i.e. the working platform is a conventional scaffold).
Referring to fig. 5-11, the device comprises two horizontally arranged cross-shaped supports 5 spaced up and down, a vertically arranged rotating shaft 4, two horizontally arranged flange bearings 7, two sets of horizontally arranged adjusting members spaced up and down, a vertically arranged rotating frame 10, two horizontally arranged limit studs 12 spaced up and down, four vertically arranged precise linear guide rails 8, four vertically arranged precise slide blocks 13, a horizontally arranged measuring mechanism 9, and a horizontally arranged grinding mechanism 11;
a flange bearing 7 and a set of adjusting parts for aligning the flange bearing 7 are arranged in the central area of each cross-shaped support 5, each set of adjusting parts comprises four groups of adjusting bolts 6 which are uniformly distributed along the circumferential direction of the cross-shaped support 5, each group of adjusting bolts 6 penetrates through the cross-shaped support 5 and is in threaded connection with the cross-shaped support 5, and the threaded end of each group of adjusting bolts 6 is in contact with the outer cylindrical surface of the flange bearing 7;
the rotating shaft 4 is correspondingly inserted and connected with the two flange bearings 7 through the upper end and the lower end thereof and then is arranged between the central areas of the two cross-shaped brackets 5;
the rotating frame 10 is a horizontal U-shaped flat frame, and the opening end of the rotating frame 10 is arranged on the rotating shaft 4 through two limiting studs 12;
two precision linear guide rails 8 which are mutually spaced and parallel are arranged on each side of the closed end of the rotating frame 10 in the thickness direction, and each precision linear guide rail 8 is provided with a precision sliding block 13 matched with the precision linear guide rail;
two precise slide blocks 13 on one side of the thickness direction of the rotating frame 10 are connected with the inner side, close to the rotating frame 10, of the measuring mechanism 9, two precise slide blocks 13 on the other side of the thickness direction of the rotating frame 10 are connected with the inner side, close to the rotating frame 10, of the polishing mechanism 11, so that the measuring mechanism 9 is located on one side of the thickness direction of the rotating frame 10, the polishing mechanism 11 is located on the other side of the thickness direction of the rotating frame 10, and the measuring mechanism 9 and the polishing mechanism 11 both extend along the length direction of the rotating frame 10;
this grinding device is measured to runner room and vertical hydraulic turbine unit when joining in marriage the dress:
the mounting position of the cross-shaped bracket 5 at the upper side is higher than a new runner chamber 1 in the vertical water turbine set, the mounting position of the cross-shaped bracket 5 at the lower side is lower than the new runner chamber 1, the new runner chamber 1 is in a non-contact state with the two cross-shaped brackets 5 respectively, and the two cross-shaped brackets 5 are welded with a water guide vane bottom ring and a tail water pipe in the vertical water turbine set respectively;
the axis of the rotating shaft 4 is coincided with the central line of the new runner chamber 1 through two sets of adjusting pieces, and the flange bearing 7 is positioned;
the measuring head 9b of the measuring mechanism 9 and the polishing head of the angle grinder 11c of the polishing mechanism 11 point to the inner wall of the new runner chamber 1.
The measuring mechanism 9 comprises a nylon seat 9a, a measuring rod 9m, a measuring head 9b, a pressure spring 9c, a limiting nut 9h, a dial indicator touch plate 9j, a clamping nut 9k, an indicator light 9d, a battery box 9e, a dial indicator support 9f, a supporting rod 9g and a dial indicator 9 i;
the nylon seat 9a and the measuring rod 9m are both horizontally arranged;
the nylon seat 9a is a cuboid with a horizontal step through hole 9n arranged inside, the length of the nylon seat 9a is smaller than that of the measuring rod 9m, and two precise sliding blocks 13 on one side of the rotating frame 10 in the thickness direction are connected with the inner side, close to the rotating frame 10, of the nylon seat 9 a;
setting the directions of the nylon seat 9a, the step through hole 9n and the measuring rod 9m close to the closed end of the rotating frame 10 as front, and setting the directions of the nylon seat 9a, the step through hole 9n and the measuring rod 9m far away from the closed end of the rotating frame 10 as back;
the measuring rod 9m is sleeved with the nylon seat 9a in an inner and outer mode through a step through hole 9n, two ends of the measuring rod 9m are located outside the nylon seat 9a, external threads are arranged at the rear portion of the measuring rod 9m, and the measuring rod 9m is in an electric insulation state with the rotating frame 10 through the nylon seat 9 a;
the step through hole 9n is formed by a small hole and a large hole which are communicated front and back and share the same axis, and an annular step surface is formed between the small hole and the large hole;
the indicator light 9d, the battery box 9e and the dial indicator support 9f which are sequentially spaced from one another from front to back are arranged on the outer side, away from the rotating frame 10, of the nylon seat 9 a;
a measuring head 9b is arranged at the front end of the measuring rod 9m, a limit nut 9h in contact with the rear end of a nylon seat 9a is arranged in the middle of the measuring rod 9m, and a dial indicator touch plate 9j which is vertically arranged and extends towards the outer side of the nylon seat 9a is arranged at the rear end of the measuring rod 9m by means of a clamping nut 9k in screwed connection with the measuring rod 9 m;
a pressure spring 9c is sleeved at the front part of the measuring rod 9m, one end of the pressure spring 9c is contacted with the step surface of the step through hole 9n, and the other end is contacted with the measuring head 9 b;
the supporting rod 9g which is horizontally arranged and extends towards the dial indicator touch plate 9j is arranged on the dial indicator support 9f, the dial indicator 9i is arranged at the end, far away from the dial indicator support 9f, of the supporting rod 9g, and the head of the dial indicator 9i is in contact with the dial indicator touch plate 9j.
The part numbers of the small hole, the large hole and the step surface are not shown in the drawing; the dial indicator 9i is commercially available.
The polishing mechanism 11 comprises a vertical moving base 11h, a linear guide rail 11a arranged horizontally, a sliding block 11b matched with the linear guide rail 11a, a horizontal moving base 11e, two clamps 11d, an angle grinder 11c, an adjusting nut 11f, a spring 11g and a connecting screw rod 11i arranged horizontally;
setting the direction of the vertical moving base 11h and the horizontal moving base 11e close to the closed end of the rotating frame 10 as front, and setting the direction of the vertical moving base 11h and the horizontal moving base 11e far away from the closed end of the rotating frame 10 as back;
the vertical moving base 11h and the horizontal moving base 11e are both in a transverse L shape, the vertical moving base 11h comprises a first front section 11ha and a first rear section 11hb which are connected in a front-back mode and have included angles of 90 degrees, the horizontal moving base 11e comprises a second front section 11ea and a second rear section 11eb which are connected in a front-back mode and have included angles of 90 degrees, and the first rear section 11hb and the second rear section 11eb both extend towards the direction far away from the rotating frame 10;
two precision slide blocks 13 on the other side of the rotating frame 10 in the thickness direction are connected with the inner side, close to the rotating frame 10, of a first front section 11ha of a vertical moving base 11 h;
the linear guide rail 11a is arranged on the outer side of the first front section 11ha of the vertical moving base 11h far away from the rotating frame 10 and is parallel to the rotating frame 10;
the front part of the second front section 11ea of the horizontal moving base 11e is attached to the sliding block 11b, the plurality of clamps 11d are connected with the outer side, away from the rotating frame 10, of the second front section 11ea of the horizontal moving base 11e, and the angle grinder 11c is arranged on the outer side, away from the rotating frame 10, of the second front section 11ea of the horizontal moving base 11e through the plurality of clamps 11 d;
the connecting screw rod 11i penetrates through the first rear section 11hb of the vertical moving base 11h and then is in threaded connection with the second rear section 11eb of the horizontal moving base 11e, a rod body of the connecting screw rod 11i, which is positioned between the first rear section 11hb and the second rear section 11eb, is sleeved with a spring 11g and is screwed with an adjusting nut 11f, and two ends of the spring 11g are in contact with the first rear section 11hb and the adjusting nut 11 f;
each of the grippers 11d comprises a horizontally arranged clevis 11da, locking screws 11db vertically penetrating the open end of the clevis 11da, and 2 wing nuts 11dc screwed to the upper and lower ends of the locking screws 11db, respectively, and contacting the open end of the clevis 11da, and the closed end of the clevis 11da is fixedly attached to the outer side of the second front section 11ea of the horizontally moving base 11e away from the turret 10. The clamp 11d is simple and reasonable in structure and good in clamping effect.
The angle grinder 11c is commercially available.
The indicating lamp 9d adopts a plurality of LED lamp pearls connected in parallel, and a section of 5# battery is assembled in the battery box 9e.
The grinding tool of the angle grinder 11c adopts an alloy grinding sheet.
What has been described above is just one embodiment of the present method, the present apparatus. It should be noted that, for a person skilled in the art, it is possible to make several variations and modifications apparent without departing from the principle of the method and the device, and these should also be considered as falling within the scope of the method and the device.
Claims (6)
1. The split replacing method for the runner chamber of the vertical hydraulic turbine set comprises the following steps:
s1 manufacturing a new runner chamber:
the new runner chamber is made of stainless steel plates and is hot-rolled into a shape, the shape of the new runner chamber is a cylinder with openings at the upper side and the lower side, and a plurality of horizontally arranged annular ribs are arranged on the outer cylindrical surface of the new runner chamber after stress is eliminated according to the conventional technology; the height and the outer diameter of the new runner chamber refer to the design parameters of the original runner chamber, and the thickness of the stainless steel plate increases the grinding allowance according to the thickness of the original runner chamber;
s2 new runner chamber split cutting:
1) the new runner chamber is at least averagely divided into three sections, the chord length of each section is smaller than the inner diameter of the original runner chamber, the lines for sectioning are longitudinally divided on the inner cylindrical surface and the outer cylindrical surface of the new runner chamber, and the inner sectioning line and the outer sectioning line are on the same longitudinal cutting plane passing through the central line of the new runner chamber;
2) welding three connecting assemblies on two circumferential sides of each outer split line along the height direction of the new runner chamber, wherein the three connecting assemblies are respectively positioned at the upper side, the middle part and the lower side of the height direction of the new runner chamber, each connecting assembly comprises two connecting pieces which are circumferentially and symmetrically arranged along the corresponding outer split line, each connecting piece is respectively welded with the outer cylindrical surface of the new runner chamber and the upper side surface of the ring rib, and each connecting assembly is positioned by a positioning pin and then fastened by a bolt;
3) cutting along each inner sectioning line, sectioning the new runner chamber along the longitudinal direction and at least averagely dividing the new runner chamber into three sections;
4) fastening bolts in sequence, and tightly connecting and combining the at least three cut segments;
s3, processing the combined split body:
machining the inner cylindrical surface of the combined split bodies by using a lathe, controlling the inner cylindrical error of each split body to be less than 2mm, controlling the maximum inner diameter to be less than the design value of an original runner chamber, and welding a first support channel steel on the upper side and the lower side of each split body respectively;
preparation before installation of the S4 split:
a working platform which meets various safety protection measures is built in the original runner chamber; removing an original runner chamber according to the size of a new runner chamber, chiseling concrete on the periphery of the original runner chamber to a required pouring space, drilling a plurality of grouting holes in a water guide vane bottom ring connected with the upper side of the original runner chamber in a vertical hydraulic turbine set, wherein the grouting holes are communicated with the pouring space, the distance between every two adjacent grouting holes is less than one meter, and washing the pouring space clean by water;
s5 installing split bodies:
1) firstly, removing a bolt of each connecting assembly, successively hoisting at least three segments into the mounting position of the original runner chamber, matching any two adjacent segments according to the positioning pins, fastening the bolts of the corresponding connecting assemblies, and connecting and combining the new runner chamber again so that at least three vertically-arranged seams are formed on the inner cylindrical surface and the outer cylindrical surface of the new runner chamber in the circumferential direction; after rechecking the inner diameter deviation value of the new runner chamber, horizontally moving the new runner chamber to respectively expose each seam of the outer cylindrical surface, welding each seam from the outer cylindrical surface in sequence to enable the new runner chamber to be in place, and then dismantling the first support channel steel on each segment;
2) the center degree and the levelness of a new runner chamber are adjusted to meet the design requirements by taking the center connecting line of a water guide vane bottom ring and a tail water pipe in the vertical water turbine unit as a reference; after the adjustment is finished, the upper side and the lower side of the new runner chamber are respectively in spot welding with a water guide vane bottom ring and a tail water pipe in the vertical water turbine unit, four welding spots are uniformly distributed on the upper side and the lower side of the new runner chamber in the circumferential direction, after the welding is finished, the centrality and the levelness of the new runner chamber are measured, if the deviation is greater than the design requirement, the welding spots need to be removed, the welding is carried out again after the adjustment, and the welding needs to be carried out symmetrically;
3) after the new runner chamber is subjected to 12 hours, rechecking the corresponding parameters of the central degree and the levelness; if the two parameters are normal, respectively welding a second support channel steel for connection at the corresponding position between the upper side and the lower side of each two adjacent segments; if the two parameters are abnormal, repeating the step 2) of installing the segments in the step S5 until the two parameters are normal, and then respectively welding a second support channel steel for connection at the corresponding positions between the upper side and the lower side of each two adjacent segments;
finally, completing the welding work of each joint of the inner cylindrical surface of the new runner chamber, wherein the welding work needs symmetrical operation;
s6 grouting and pouring:
adopting a commercially available shrinkage-free cement grouting material, and sequentially grouting and pouring through the plurality of grouting holes; two persons operate during grouting and pouring, one person performs grouting, and the other person performs repeated vibration by extending into a grouting area from an adjacent grouting hole through a vibration pump, so that grouting and pouring are guaranteed to be compact; grouting and pouring are carried out by the plurality of grouting holes in turn, and the grouting and pouring are carried out circularly until grout is discharged from the adjacent grouting holes; plugging a plurality of grouting holes after grouting and pouring are finished; after 72 hours, removing the second supporting channel steel between the upper sides and the lower sides of every two adjacent segments, cleaning a new runner chamber, and polishing all welding seams and all welding spots to be level;
s7 measurement of grinding new runner chamber:
1) according to the height of the new runner chamber, a plurality of horizontal cross sections for horizontal measurement are set on the inner wall of the new runner chamber by a commercially available laser theodolite, and at least 16 measuring points are uniformly distributed in the circumferential direction of each horizontal cross section;
2) two cross-shaped brackets of the runner chamber measuring and polishing device are respectively arranged at corresponding positions higher than and lower than the new runner chamber, and the two cross-shaped brackets are respectively welded with the water guide vane bottom ring and the tail water pipe; a rotating shaft which is vertically arranged is arranged between the central areas of the two cross-shaped brackets, and the axis of the rotating shaft is adjusted to be superposed with the central connecting line by taking the central connecting line of a water guide vane bottom ring and a draft tube in the vertical water turbine set as a reference; finally, the installation of the rotating wheel chamber measuring and polishing device is completed, and the set value of a measuring rod of a measuring mechanism in the rotating wheel chamber measuring and polishing device is adjusted according to the designed inner diameter of the new rotating wheel chamber;
3) measuring and recording data of each measuring point by adopting the measuring mechanism; for the area with the inner diameter smaller than the designed value range, a grinding mechanism in the rotating wheel chamber measuring and grinding device is adopted for grinding; for the area with the inner diameter larger than the designed value range, firstly filling the area with a stainless steel welding rod, and then polishing the area by adopting the polishing mechanism; when polishing, checking cylindricity and roundness by using a straight ruler and an arc template; the measurement and the polishing are repeatedly and continuously carried out until the inner diameter, the cylindricity and the roundness of the new runner chamber meet the requirements;
4) and (3) removing the rotating wheel chamber measuring and polishing device, rechecking whether the center line of the new rotating wheel chamber, the center connecting line of the water guide vane bottom ring and the tail water pipe are collinear, and cleaning the replacing site of the new rotating wheel chamber to complete the split replacement of the rotating wheel chamber of the vertical water turbine unit.
2. A wheel-chamber measuring grinding apparatus for use in the method of claim 1, characterized by:
the device comprises two horizontally-arranged and vertically-spaced cross-shaped supports, a vertically-arranged rotating shaft, two horizontally-arranged flange bearings, two sets of horizontally-arranged and vertically-spaced adjusting pieces, a vertically-arranged rotating frame, two horizontally-arranged and vertically-spaced limiting studs, four vertically-arranged precise linear guide rails, four vertically-arranged precise sliding blocks, a horizontally-arranged measuring mechanism and a horizontally-arranged grinding mechanism;
a flange bearing and a set of adjusting parts for aligning the flange bearing are arranged in the central area of each cross-shaped support, each set of adjusting parts comprises four groups of adjusting bolts which are uniformly distributed along the circumferential direction of the cross-shaped support, each group of adjusting bolts penetrates through the cross-shaped support and is in threaded connection with the cross-shaped support, and the threaded end of each group of adjusting bolts is in contact with the outer cylindrical surface of the flange bearing;
the rotating shaft is correspondingly inserted and connected with the two flange bearings through the upper end and the lower end of the rotating shaft and then is arranged between the central areas of the two cross-shaped brackets;
the rotating frame is a transverse U-shaped flat frame, and the opening end of the rotating frame is arranged on the rotating shaft through two limiting studs;
two precision linear guide rails which are mutually spaced and parallel are arranged on each side of the thickness direction at the closed end of the rotating frame, and each precision linear guide rail is provided with a precision slide block matched with the precision linear guide rail;
the two precise sliding blocks on one side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the measuring mechanism, and the two precise sliding blocks on the other side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the polishing mechanism, so that the measuring mechanism is located on one side of the rotating frame in the thickness direction, the polishing mechanism is located on the other side of the rotating frame in the thickness direction, and the measuring mechanism and the polishing mechanism extend in the length direction of the rotating frame;
this grinding device is measured to runner room and vertical hydraulic turbine unit when joining in marriage the dress:
the mounting position of the upper cross-shaped bracket is higher than a new runner chamber in the vertical water turbine set, the mounting position of the lower cross-shaped bracket is lower than the new runner chamber, the new runner chamber is respectively in a non-contact state with the two cross-shaped brackets, and the two cross-shaped brackets are respectively welded with a water guide vane bottom ring and a tail water pipe in the vertical water turbine set;
the axis of the rotating shaft is coincided with the central line of the new runner chamber through two sets of adjusting pieces, and the flange bearing is positioned;
the measuring head of the measuring mechanism and the polishing head of the angle grinder of the polishing mechanism point to the inner wall of the new runner chamber.
3. The wheel cell measuring and polishing device of claim 2, wherein:
the measuring mechanism comprises a nylon seat, a measuring rod, a measuring head, a pressure spring, a limiting nut, a dial indicator touch plate, a clamping nut, an indicator lamp, a battery box, a dial indicator support, a support rod and a dial indicator;
the nylon seat and the measuring rod are both horizontally arranged;
the nylon seat is a cuboid with a horizontal step through hole in the interior, the length of the nylon seat is smaller than that of the measuring rod, and two precise sliding blocks on one side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the nylon seat;
setting the direction of the nylon seat, the step through hole and the measuring rod close to the closed end of the rotating frame as front, and setting the direction of the nylon seat, the step through hole and the measuring rod far away from the closed end of the rotating frame as back;
the measuring rod is sleeved with the nylon seat inside and outside by virtue of the step through hole, two ends of the measuring rod are positioned outside the nylon seat, external threads are arranged at the rear part of the measuring rod, and the measuring rod is in an electric insulation state with the rotating frame through the nylon seat;
the step through hole is formed by a small hole and a large hole which are communicated front and back and share the same axis, and an annular step surface is formed between the small hole and the large hole;
the indicator light, the battery box and the dial indicator support which are sequentially spaced from one another from front to back are arranged on the outer side, away from the rotating frame, of the nylon seat;
the measuring head is arranged at the front end of the measuring rod, the limiting nut which is contacted with the rear end of the nylon seat is arranged in the middle of the measuring rod, and the dial indicator touch plate which is vertically arranged and extends towards the outer side of the nylon seat is arranged at the rear end of the measuring rod by virtue of the clamping nut which is screwed with the measuring rod;
the pressure spring is sleeved at the front part of the measuring rod, one end of the pressure spring is contacted with the step surface of the step through hole, and the other end of the pressure spring is contacted with the measuring head;
the branch that level was arranged and extended towards the percentage table touch panel is established on the percentage table support, and the percentage table is established at the end that branch kept away from the percentage table support, and the gauge outfit of percentage table contacts with the percentage table touch panel.
4. The wheel house measurement grinding apparatus of claim 2, wherein:
the polishing mechanism comprises a vertical moving base, a linear guide rail arranged horizontally, a sliding block matched with the linear guide rail, a horizontal moving base, a plurality of clamps, an angle grinder, an adjusting nut, a spring and a connecting screw rod arranged horizontally;
setting the direction of the vertical moving base and the horizontal moving base close to the closed end of the rotating frame as front, and setting the direction of the vertical moving base and the horizontal moving base far away from the closed end of the rotating frame as back;
the vertical moving base and the horizontal moving base are both in a transverse L shape, the vertical moving base comprises a first front section and a first rear section which are connected in a front-back manner and have an included angle of 90 degrees, the horizontal moving base comprises a second front section and a second rear section which are connected in a front-back manner and have an included angle of 90 degrees, and the first rear section and the second rear section both extend towards the direction far away from the rotating frame;
the two precise slide blocks on the other side of the rotating frame in the thickness direction are connected with the inner side, close to the rotating frame, of the first front section of the vertical moving base;
the linear guide rail is arranged on the outer side of the first front section of the vertical moving base, which is far away from the rotating frame, and is parallel to the rotating frame;
the front part of the second front section of the horizontal moving base is attached to the sliding block, the plurality of clamps are connected with the outer side, away from the rotating frame, of the second front section of the horizontal moving base, and the angle grinder is arranged on the outer side, away from the rotating frame, of the second front section of the horizontal moving base through the plurality of clamps;
the connecting screw rod penetrates through the first rear section of the vertical moving base and then is in threaded connection with the second rear section of the horizontal moving base, the connecting screw rod body between the first rear section and the second rear section is respectively sleeved with the spring and the adjusting nut in a screwing mode, and two ends of the spring are in contact with the first rear section and the adjusting nut.
5. The wheel cell measuring and polishing device of claim 3, wherein:
the indicating lamp adopts a plurality of parallelly connected LED lamp pearls, and the internal assembly of battery box is a section of 5# battery.
6. The wheel cell measuring and polishing device of claim 4, wherein:
the angle grinder adopts an alloy grinding sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210564416.0A CN114770322A (en) | 2022-05-23 | 2022-05-23 | Split replacing method for runner chamber of vertical hydraulic turbine unit and measuring and polishing device for runner chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210564416.0A CN114770322A (en) | 2022-05-23 | 2022-05-23 | Split replacing method for runner chamber of vertical hydraulic turbine unit and measuring and polishing device for runner chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114770322A true CN114770322A (en) | 2022-07-22 |
Family
ID=82409469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210564416.0A Pending CN114770322A (en) | 2022-05-23 | 2022-05-23 | Split replacing method for runner chamber of vertical hydraulic turbine unit and measuring and polishing device for runner chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114770322A (en) |
-
2022
- 2022-05-23 CN CN202210564416.0A patent/CN114770322A/en active Pending
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