Hole opening machining device for runner runner cone of water-turbine generator set

Abstract

A water-turbine generator set runner runner runner cone trepanning device comprises a boring machine, a boring machine supporting plate is arranged below the boring machine, two sets of front end fixing plates are vertically and fixedly clamped at the front end of the boring machine supporting plate, and two sets of rear end fixing plates are vertically and fixedly clamped at the rear end of the boring machine supporting plate. The front-end fixing plate and the rear-end fixing plate are fixed to the inner cylinder wall of the runner runner cone in an abutting mode through adjusting devices, and the inner cylinder wall of the runner runner cone is protected through protection pads in the middle. According to the device, on-site trepanning of the runner runner cone of the water-turbine generator set is achieved, the investment of disassembly and assembly and large equipment is reduced, and the adjustable boring machine supporting plate, the front end fixing plate and the rear end fixing plate are arranged, so that the device is suitable for machining round holes in different product sizes, and installation and disassembly are convenient; due to the arrangement of the adjusting device, the tool can be quickly loosened and switched to the next group of hole positions, so that the clamping time is saved, and the machining efficiency is improved; and by arranging the protection pad, the runner runner cone of the water-turbine generator set is further protected, and meanwhile stability and shock absorption are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine maintenance, in particular to a device for processing holes in a water discharge cone of a runner of a water turbine generator set. Background Art

[0002] Turbine stability is an important basis for the normal operation of hydropower units and the safety of power stations. At present, the stability of hydropower units is relatively complex and has many influencing factors. Among them, the low-frequency pressure pulsation problem caused by the vortex belt of the tailwater tube is the most prominent. Studies have found that drilling holes in the runner discharge cone can effectively reduce the pressure pulsation level of the tailwater tube and improve the operation stability of the unit; at the same time, drilling holes in the runner discharge cone can allow the water flow to be discharged more smoothly, recover part of the water flow energy, and improve the efficiency of water energy utilization. According to the requirements of a power station, it is necessary to implement on-site drilling and transformation of the runner discharge cone of a certain unit to realize on-site technical transformation and processing of the runner discharge cone. Due to the complex structure of the turbine runner, the large size and the difficulty of disassembly and assembly, the on-site hole drilling solution was adopted after research.

[0003] The dimensional accuracy and smoothness of the holes opened on site are poor, and cavitation is serious during online use, which affects the life of the turbine generator set impeller. It is difficult to disassemble and process it, and the transportation cost is high, the cycle is long, and it affects the operation of the generator set. Manual grinding makes it difficult to control the size and accuracy. The thickness of the impeller drain cone cylinder exceeds 40mm, the number of holes exceeds 48, and the construction period cannot be guaranteed. There is currently no mature experience to learn from. Therefore, a processing device for opening holes in the impeller drain cone of a turbine generator set is studied and designed to solve the processing problem of on-site hole opening. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a device for drilling holes of a water turbine generator set runner drain cone, so as to realize on-site drilling of holes of a water turbine generator set runner drain cone and be suitable for drilling holes of different product sizes.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a device for drilling holes in the runner drain cone of a hydro-turbine generator set, including a boring machine, a boring machine support plate is arranged below the boring machine, two groups of front end fixing plates are clamped and fixed on the front end of the boring machine support plate, and two groups of rear end fixing plates are also clamped and fixed on the rear end, the front end fixing plate and the rear end fixing plate are both fixed to the inner cylinder wall of the runner drain cone through an adjusting device, and a protective pad is used in the middle to protect the inner cylinder wall of the runner drain cone.

[0006] In a preferred embodiment, the boring machine is a portable boring machine, including a boring bar, on which a spindle box, a feed box, a power device and a tool rod are fixedly mounted, and a connecting flange is provided on the spindle box. The boring machine is fixed to the boring machine support plate by adjusting bolts and nuts through the connecting flange.

[0007] In the preferred solution, the boring machine support plate is provided with a plurality of bolt mounting holes, and the bolt mounting holes are arranged in two groups to ensure that the boring machine can be adjusted front and back while being installed with the boring machine connecting flange. The boring machine support plate is also provided with a plurality of lightening holes and fixing plate connecting holes.

[0008] In a preferred solution, the front end fixing plate includes a front connecting plate, and a front fixing plate is vertically fixed to the front end of the front connecting plate.

[0009] In a preferred solution, a plurality of support plate connecting holes are provided on the front end fixing plate, and the front end fixing plate and the boring machine support plate are fixed together by bolts and nuts through the support plate connecting holes and the fixing plate connecting holes.

[0010] In a preferred solution, the front fixing plate is provided with an adjusting device mounting hole, and the adjusting device is installed in the adjusting device mounting hole and fixed on the inner cylinder wall of the runner drain cone.

[0011] In a preferred solution, the rear end fixing plate is similar in structure to the front end fixing plate, and a rear connecting plate and a rear fixing plate are provided which are vertically installed and fixed together.

[0012] In a preferred embodiment, the adjusting device includes an adjusting bolt, on which an adjusting nut and a locking nut are installed. The adjusting bolt is installed in the mounting hole of the adjusting device, and the locking nut is installed at the end of the adjusting bolt and fixed on the inner cylinder wall of the runner drain cone.

[0013] In a preferred solution, the locking nut head is provided with a serrated claw.

[0014] In a preferred embodiment, the protective pad is a thin copper sheet with a thickness of 0.5-2 mm.

[0015] The device for processing holes for the runner drain cone of a hydro-generator set provided by the utility model has the following beneficial effects:

[0016] 1. The utility model realizes the on-site processing of the hole opening of the runner discharge cone of the hydro-generator set, reduces the investment of disassembly and assembly and large equipment, ensures the size and accuracy of the hole opening, and solves the problem of severe cavitation at the hole opening;

[0017] 2. The utility model is provided with an adjustable boring machine support plate and a front fixing plate and a rear fixing plate, so that it is suitable for processing round holes on products of different sizes and is convenient for installation and disassembly;

[0018] 3. The setting of the adjustment device of the utility model enables it to be quickly loosened and switched to the next set of hole positions, thereby saving clamping time and improving processing efficiency;

[0019] 4. The utility model has a serrated locking nut on the head, which makes the adjustment device more firmly fixed to the inner wall of the runner drain cone, and further improves the stability and firmness of the device during boring processing, thereby further improving the quality of hole processing;

[0020] 5. The setting of the protective pad of the utility model further protects the water discharge cone of the runner of the hydro-generator set, and ensures the stable connection between the device and the water discharge cone. At the same time, the setting of the soft copper pad reduces the vibration during processing, ensures the processing quality, and protects the operators;

[0021] 6. The utility model has been successfully applied to the processing of on-site holes for the runner drain cone and has been promoted for use in other units. It has good processing quality, high efficiency and strong stability. The cavitation phenomenon is solved after it is put into use online, which improves the overall life of the runner of the hydro-turbine generator set. At the same time, it provides new solutions and valuable practical experience for subsequent turbine maintenance, and has high practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation examples:

[0023] Figure 1 It is a schematic diagram of the assembly of the utility model and the drain cone (the boring machine is not shown);

[0024] Figure 2 It is an assembly diagram of the support plate, front end fixing plate, rear end fixing plate and adjusting device of the boring machine of the utility model;

[0025] Figure 3 It is a front view of the boring machine of the utility model;

[0026] Figure 4 It is a left side view of the boring machine of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the support plate of the boring machine of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the front end fixing plate of the utility model;

[0029] In the figure: boring machine 1, boring machine support plate 2, front end fixing plate 3, rear end fixing plate 4, adjustment device 5, protection pad 6, boring bar 11, spindle box 12, feed box 13, power unit 14, tool rod 15, connecting flange 16, bolt mounting hole 21, lightening hole 22, fixing plate connecting hole 23, front connecting plate 31, front fixing plate 32, support plate connecting hole 33, adjustment device mounting hole 34, adjusting bolt 51, adjusting nut 52, locking nut 53. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0031] like Figures 1 to 6 As shown, a drilling processing device for a runner discharge cone of a hydro-turbine generator unit comprises a boring machine 1, a boring machine support plate 2 is arranged below the boring machine 1, two groups of front end fixing plates 3 are clamped and fixed on the front end of the boring machine support plate 2, and two groups of rear end fixing plates 4 are also clamped and fixed on the rear end, the front end fixing plate 3 and the rear end fixing plate 4 are both fixed on the inner cylinder wall of the runner discharge cone through an adjusting device 5, and a protective pad 6 is used in the middle to protect the inner cylinder wall of the runner discharge cone.

[0032] In this embodiment, the boring machine 1 is a portable boring machine, including a boring rod 11, on which a spindle box 12, a feed box 13, a power device 14 and a tool rod 15 are fixedly installed, and a connecting flange 16 is provided on the spindle box 12. The boring machine 1 is fixed to the boring machine support plate 2 by adjusting bolts and nuts through the connecting flange 16.

[0033] Furthermore, the boring machine support plate 2 is provided with a plurality of bolt mounting holes 21, and the bolt mounting holes 21 are arranged in two groups to ensure that the boring machine 1 can be adjusted forward and backward while being installed with the boring machine 1 connecting flange 16. The boring machine support plate 2 is also provided with a plurality of lightening holes 22 and fixing plate connecting holes 23.

[0034] Furthermore, the front end fixing plate 3 includes a front connecting plate 31 , and a front fixing plate 32 is vertically fixed to the front end of the front connecting plate 31 .

[0035] Furthermore, a plurality of support plate connection holes 33 are provided on the front end fixing plate 3, and the front end fixing plate 3 and the boring machine support plate 2 are fixed together by bolts and nuts through the support plate connection holes 33 and the fixing plate connection holes 23.

[0036] Furthermore, the front fixing plate 32 is provided with an adjusting device mounting hole 34 , and the adjusting device 5 is installed in the adjusting device mounting hole 34 and fixed on the inner cylinder wall of the runner drain cone.

[0037] Furthermore, the rear end fixing plate 4 is similar in structure to the front end fixing plate 3, and a rear connecting plate and a rear fixing plate are provided which are vertically installed and fixed together.

[0038] Furthermore, the adjusting device 5 includes an adjusting bolt 51, on which an adjusting nut 52 and a locking nut 53 are installed. The adjusting bolt 51 is installed in the adjusting device mounting hole 34, and the locking nut 53 is installed at the end of the adjusting bolt 51 and fixed on the inner cylinder wall of the runner drain cone.

[0039] Furthermore, the head of the locking nut 53 is provided with a serrated claw.

[0040] Furthermore, the protection pad 6 is a thin copper sheet, and the thickness of the thin copper sheet is 0.5-2 mm.

[0041] When used specifically, the steps and methods for on-site hole drilling using the hydro-generator runner drain cone drilling device are as follows:

[0042] Step 1: First select the boring machine 1, design and make the boring machine support plate 2, two sets of front fixing plates 3 and rear fixing plates 4, four sets of protection pads 6, and prepare four sets of adjusting bolts 51 and adjusting nuts 52 of the adjusting device 5 according to the selected boring machine 1, and keep them ready for use after acceptance;

[0043] Step 2: Use the guide chain to hoist the components of the device onto the platform set up inside the water discharge cone. Figure 1 Assemble the boring machine support plate 2, the front end fixing plate 3, the rear end fixing plate 4, and the adjustment device 5 in place;

[0044] Step 3: Install and fix the boring machine 1 and the boring machine support plate 2 together, use the guide chain to lift the entire device to the lowest processing hole position, and adjust the center of the boring bar 11 to be concentric with the center of the hole, install a special boring tool fixture on the boring machine 1, adjust the center of the fixture to ensure that it is concentric with the center of the hole, adjust the adjustment device 5 to contact the inner wall of the drainage cone, install the protection pad 6, lock the adjustment bolt 51 of the adjustment device 5 to ensure that it is firmly fixed to the inner wall of the drainage cone, and tighten the guide chain;

[0045] Step 4: Install the boring tool, set the boring machine 1 speed, feed rate, and cutting amount, and then conduct a boring test;

[0046] Step 5: After the trial cutting is qualified, set the speed, feed rate and cutting amount of boring machine 1, and then carry out formal processing;

[0047] Step 6: After a hole is processed, the boring bar 11 retracts, the adjusting screw 51 of the adjusting device 5 is loosened, the protective pad 6 is removed, the tooling is rotated to the next hole position, the boring machine 1 is adjusted, the center of the fixture is adjusted to ensure that it is concentric with the center of the hole, and the adjusting device 5 is adjusted to contact the inner wall of the drain cone, the protective pad 6 is installed, and the adjusting bolt 51 of the adjusting device 5 is locked to ensure that it is firmly fixed to the inner wall of the drain cone, and steps 4 to 5 are repeated;

[0048] Step 7: After the holes on the same layer are processed, use the guide chain to lift the entire device to the processing hole position, and adjust the center of the boring bar 11 to be concentric with the center of the hole, install a special boring tool fixture on the boring machine 1, adjust the center of the fixture to ensure that it is concentric with the center of the hole, adjust the adjusting device 5 to contact the inner wall of the drainage cone, install the protective pad 6, lock the adjusting bolt 51 of the adjusting device 5 to ensure that it is firmly fixed to the inner wall of the drainage cone, tighten the guide chain, and repeat steps 4 to 6 until all the holes on the drainage cone are processed and accepted.

[0049] In the preferred embodiment, the boring machine 1 is a portable boring machine, including a boring rod 11, on which a spindle box 12, a feed box 13, a power unit 14 and a tool rod 15 are mounted and fixed, and a connecting flange 16 is provided on the spindle box 12. The boring machine 1 is fixed to the boring machine support plate 2 by adjusting bolts and nuts through the connecting flange 16. The above arrangement enables the function of the boring machine 1 to be realized while being effectively connected and fixed to the boring machine support plate 2, thereby ensuring the accuracy of the boring.

[0050] In the preferred scheme, the boring machine support plate 2 is provided with a plurality of bolt mounting holes 21, and the bolt mounting holes 21 are arranged in two groups, so as to ensure that the boring machine 1 can be adjusted forward and backward while being installed with the connecting flange 16 of the boring machine 1, and the boring machine support plate 2 is also provided with a plurality of lightening holes 22 and fixing plate connecting holes 23; the above arrangement enables the boring machine support plate 2 to realize the supporting effect of the boring machine 1 while improving the application scope of the device, and is suitable for the processing of holes on parts of different sizes.

[0051] In the preferred scheme, the front end fixing plate 3 includes a front connecting plate 31, and a front fixing plate 32 is vertically fixed to the front end of the front connecting plate 31; a plurality of support plate connecting holes 33 are arranged on the front end fixing plate 3, and the front end fixing plate 3 and the boring machine support plate 2 are fixed together by bolts and nuts through the support plate connecting holes 33 and the fixing plate connecting holes 23; the above arrangement enables the front end fixing plate 3 and the boring machine support plate 2 to be effectively connected and fixed together, while providing an installation space for the adjustment device 5, and the structural design is conducive to quick installation and disassembly, convenient and quick switching to the next hole position, and saving processing and clamping time.

[0052] In the preferred solution, an adjustment device mounting hole 34 is provided on the front fixing plate 32, and the adjustment device 5 is installed in the adjustment device mounting hole 34 and fixed on the inner wall of the runner water discharge cone; the above arrangement enables the device to be stably fixed to the inner wall of the water discharge cone, while facilitating and quickly installing, disassembling and switching to the next hole position, saving processing and clamping time.

[0053] In the preferred solution, the rear end fixing plate 4 is similar in structure to the front end fixing plate 3, and a rear connecting plate and a rear fixing plate are vertically installed and fixed together; the above arrangement enables the functions of the connection and installation adjustment device 5 of the rear end fixing plate 4 to be realized, while being paired with the front end fixing plate 3 to facilitate the installation and operation of the boring machine 1, and has a simple structure, low cost, easy operation, and high reuse rate.

[0054] In the preferred solution, the adjusting device 5 includes an adjusting bolt 51, on which an adjusting nut 52 and a locking nut 53 are installed. The adjusting bolt 51 is installed in the adjusting device mounting hole 34, and the locking nut 53 is installed at the end of the adjusting bolt 51 and fixed on the inner wall of the runner water discharge cone. The above arrangement enables the adjusting function of the adjusting device 5 to be realized while the device can be fixed to the inner wall of the water discharge cone, thereby ensuring stability during the processing process, thereby improving the processing quality of the holes opened on the wall of the water discharge cone.

[0055] In the preferred embodiment, the head of the locking nut 53 is provided with a rectangular claw; the above arrangement not only makes the adjustment device 5 more firmly fixed to the inner wall of the runner drain cone, but also further improves the stability and firmness of the device during boring processing, thereby further improving the quality of hole processing.

[0056] In the preferred solution, the protection pad 6 is a thin copper sheet with a thickness of 0.5-2 mm. The above arrangement protects the runner discharge cone of the hydro-turbine generator set while ensuring a stable connection between the device and the discharge cone. At the same time, the setting of the soft copper pad reduces vibration during processing, ensures processing quality, and protects operators.

[0057] In summary, the device for drilling holes in the water discharge cone of the runner of the hydro-turbine generator set provided by the utility model realizes the on-site drilling of holes in the water discharge cone of the runner of the hydro-turbine generator set, reduces the investment in disassembly and assembly and large equipment, ensures the size and accuracy of the holes, and solves the problem of severe cavitation at the holes; by setting an adjustable boring machine support plate and a front fixing plate and a rear fixing plate, it is suitable for processing round holes on products of different sizes, and is convenient for installation and disassembly; by setting an adjusting device, it can be quickly loosened and switched to the next group of hole positions, thereby saving clamping time and improving processing efficiency; by setting a locking nut with a serrated head, it can be The device is fixed to the inner cylinder wall of the drain cone more firmly, and the stability of the device during the processing is enhanced; by setting the protective pad, the drain cone of the runner of the hydro-turbine generator set is further protected, and the connection between the device and the drain cone is guaranteed to be firm. At the same time, the soft copper pad reduces the vibration during processing, ensures the processing quality and protects the operators; the utility model has ingenious conception, exquisite design, simple and reliable structure, can be widely used in the processing of on-site hole opening of large equipment and parts, has strong practicality, good stability, wide application range, strong scalability, high promotion value, has high practical application value, and good economic and social benefits.

Claims

1. A device for processing holes in the runner drain cone of a hydro-generator set, characterized in that: The invention comprises a boring machine (1), a boring machine support plate (2) is arranged below the boring machine (1), two groups of front end fixing plates (3) are clamped and fixed at the front end and the rear end of the boring machine support plate (2), and two groups of rear end fixing plates (4) are clamped and fixed at the rear end, the front end fixing plate (3) and the rear end fixing plate (4) are both fixed to the inner cylinder wall of the runner water discharge cone through an adjustment device (5), and a protective pad (6) is used in the middle to protect the inner cylinder wall of the runner water discharge cone.

2. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 1, characterized in that: The boring machine (1) is a portable boring machine, comprising a boring bar (11), a spindle box (12), a feed box (13), a power device (14) and a cutter bar (15) being fixedly mounted on the boring bar (11), a connecting flange (16) being provided on the spindle box (12), and the boring machine (1) being fixedly mounted on a boring machine support plate (2) by means of the connecting flange (16) using adjusting bolts and nuts.

3. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 2, characterized in that: The boring machine support plate (2) is provided with a plurality of bolt mounting holes (21), and the bolt mounting holes (21) are arranged in two groups, so as to ensure that the boring machine (1) can be adjusted forward and backward while being mounted on the boring machine (1) connecting flange (16). The boring machine support plate (2) is also provided with a plurality of lightening holes (22) and fixing plate connecting holes (23).

4. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 3 is characterized in that: The front end fixing plate (3) comprises a front connecting plate (31), and a front fixing plate (32) is vertically fixed to the front end of the front connecting plate (31).

5. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 4, characterized in that: The front end fixing plate (3) is provided with a plurality of support plate connection holes (33), and the front end fixing plate (3) and the boring machine support plate (2) are fixed together by bolts and nuts via the support plate connection holes (33) and the fixing plate connection holes (23).

6. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 4, characterized in that: The front fixing plate (32) is provided with an adjusting device mounting hole (34), and the adjusting device (5) is mounted in the adjusting device mounting hole (34) and fixed on the inner cylinder wall of the runner drain cone.

7. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 4, characterized in that: The rear end fixing plate (4) has a similar structure to the front end fixing plate (3), and is provided with a rear connecting plate and a rear fixing plate which are vertically mounted and fixed together.

8. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 6, characterized in that: The adjusting device (5) comprises an adjusting bolt (51), an adjusting nut (52) and a locking nut (53) being mounted on the adjusting bolt (51), the adjusting bolt (51) being mounted in the adjusting device mounting hole (34), and the locking nut (53) being mounted at the end of the adjusting bolt (51) and fixed on the inner wall of the runner drain cone.

9. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 8, characterized in that: The head of the locking nut (53) is provided with a sawtooth-shaped claw.

10. The device for drilling holes for the runner drain cone of a hydro-generator set according to claim 1, characterized in that: The protection pad (6) is a thin copper sheet, and the thickness of the thin copper sheet is 0.5-2 mm.

Images