On-site trepanning device for runner runner cone of water-turbine generator set

Abstract

A field tapping device for a runner runner cone of a water-turbine generator set comprises a radius adjusting rod, a center positioning rod is sleeved on the radius adjusting rod, a cutting torch positioning device is detachably mounted at one end of the radius adjusting rod, a cutting torch is fixed in the cutting torch positioning device, and a hole is cut by positioning a center through the center positioning rod and positioning a radius through the radius adjusting rod. The center positioning rod comprises a positioning screw, a locking nut is installed on the positioning screw, a hole center positioning cone is fixedly installed at the front end of one end of the center positioning rod, the cutting torch positioning device comprises a connecting outer ring, a locking inner ring is sleeved with the connecting outer ring, a pulley device is installed on the periphery of the connecting outer ring, and a cutting torch fixing screw is detachably installed in the circumferential direction of the locking inner ring. 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 radius adjusting rod is arranged, so that the device is suitable for cutting round holes with different radiuses; and a pulley device is arranged, so that the distance between the gun nozzle and the workpiece is ensured in the cutting process, and the cutting moving process is smoother.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine maintenance, in particular to an on-site hole opening device for 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 downward, 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 transformation of the runner discharge cone of a unit to realize on-site technical transformation and processing of the runner discharge cone.

[0003] Due to the complex structure and large size of the turbine runner, it is difficult to disassemble and assemble. The runner drain cone is a cylindrical structure with a thickness of more than 40mm, making it extremely difficult to drill a hole. There is currently no mature experience to draw on. Therefore, a special project was launched to research and design a device for on-site drilling of holes in the runner drain cone of a hydro-turbine generator set to solve the problem of on-site drilling holes. Summary of the invention

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

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: an on-site hole drilling device for a runner drain cone of a hydro-turbine generator set, comprising a radius adjusting rod, a center positioning rod is mounted on the radius adjusting rod, a cutting torch positioning device is detachably installed at one end of the radius adjusting rod, the cutting torch is fixed in the cutting torch positioning device, and a hole is cut by locating the center through the center positioning rod and locating the radius through the radius adjusting rod.

[0006] In a preferred solution, the middle of the radius adjustment rod is a smooth rod, both ends of the rod are provided with external threads, and the middle smooth rod part is set to be rectangular.

[0007] In a preferred solution, the center positioning rod includes a positioning screw, a set of locking nuts are installed on the positioning screw, and a hole center positioning cone is fixedly installed at the front end of one end.

[0008] In the preferred solution, a waist groove is provided in the middle of the positioning screw, and the radius adjustment rod is inserted in the waist groove and slides back and forth. A group of locking nuts are respectively installed on both sides of the waist hole and locked on the rectangular smooth rod of the radius adjustment rod to fix the radius adjustment rod.

[0009] In a preferred solution, the cutting torch positioning device includes a connecting outer ring, a locking inner ring is sleeved inside the connecting outer ring, the locking inner ring rotates inside the connecting outer ring, and a cutting torch fixing screw is detachably mounted circumferentially on one end of the locking inner ring.

[0010] In a preferred solution, a plurality of bosses are provided on the outer periphery of the connecting outer ring, and internal threads are provided on the bosses, wherein one of the internal threaded holes is screwed to the external thread on the end of the radius adjustment rod to install and fix the cutting torch positioning device and the radius adjustment rod together.

[0011] In a preferred solution, a locking screw is installed in the internal threaded hole of another boss of the connecting outer ring, which is used to lock the locking inner ring installed on the connecting outer ring.

[0012] In a preferred solution, the connecting outer ring further has an internal threaded hole of a boss, in which a connecting screw is installed, and a pulley device is installed on the outer periphery of the connecting outer ring through the connecting screw.

[0013] In a preferred embodiment, the pulley device includes a slide rod with holes at both ends of the slide rod, and multiple holes are arranged at one end along the height direction of the slide rod, one of the holes is installed with a connecting screw, and the other end is set as a single hole, a roller is installed in the hole, and a pulley is rotatably installed on the roller.

[0014] In a preferred solution, the locking inner ring is made of high temperature resistant special engineering plastics.

[0015] The on-site hole-drilling device 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 is provided with a center positioning rod 2, which effectively positions and fixes the center of the cutting hole, making the cutting hole more accurate and regular;

[0017] 2. The utility model is provided with a radius adjustment rod, so that the radius can be determined and it is suitable for cutting circular holes of different radii, thereby improving the application range of the device;

[0018] 3. The utility model is provided with a pulley device, which ensures the distance between the gun nozzle and the workpiece during the cutting process and makes the cutting movement process smoother;

[0019] 4. The utility model pulley device has a multi-hole adjustable design in the height direction of the slide rod, which further improves its height adjustment range and has a wider range of applications;

[0020] 5. The structural design of the cutting torch positioning device of the utility model connects the outer ring and the locking inner ring, so that the two can be relatively fixed and rotated relative to each other, making the cutting process smoother, thereby further improving the cutting quality of the cutting hole and facilitating the operation of the operator, and the smooth cutting of the circular hole can be completed without moving;

[0021] 6. The utility model sets the high temperature resistant special engineering plastic material for the locking inner ring, so that the heat resistance and insulation of the device are guaranteed, thereby improving the safety and reliability of the device;

[0022] 7. The utility model realizes the on-site opening of the water discharge cone of the runner of the hydro-generator set, without the need for returning to the factory for processing, thus improving the maintenance efficiency and saving costs;

[0023] 8. The utility model realizes the rapid positioning of the cutting hole center, radius and cutting torch head height, thus improving the cutting efficiency;

[0024] 9. The utility model realizes the uniform cutting speed of the manual cutting torch and ensures the cutting quality;

[0025] 10. The utility model has been successfully applied to the opening of the runner drain cone and has been promoted for use in other units. It has good hole cutting quality, high cutting efficiency and strong stability, laying a solid foundation for ensuring the quality and efficiency of subsequent boring processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings and implementation examples:

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 It is a structural schematic diagram of the runner discharge cone of a hydro-generator set;

[0029] Figure 3 This is a schematic diagram of the structure of the radius adjustment rod of the utility model;

[0030] Figure 4 This is a structural schematic diagram of the center positioning rod of the utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the cutting torch positioning device of the utility model;

[0032] Figure 6 It is a front view of the cutting torch positioning device of the utility model;

[0033] In the figure: radius adjustment rod 1, center positioning rod 2, cutting torch positioning device 3, positioning screw 21, locking nut 22, positioning cone 23, connecting outer ring 31, locking inner ring 32, cutting torch fixing screw 33, locking screw 34, connecting screw 35, pulley device 36, slide rod 361, roller 362, pulley 363. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0035] like Figures 1 to 6 As shown, the on-site hole drilling device for the runner discharge cone of a hydro-turbine generator unit comprises a radius adjusting rod 1, on which a center positioning rod 2 is mounted, and a cutting torch positioning device 3 is detachably mounted at one end of the radius adjusting rod 1. The cutting torch is fixed in the cutting torch positioning device 3, and a hole is cut by locating the center through the center positioning rod 2 and locating the radius through the radius adjusting rod 1.

[0036] In this embodiment, the radius adjustment rod 1 has a smooth rod in the middle, external threads are arranged at both ends, and the smooth rod portion in the middle is arranged in a rectangular shape.

[0037] Furthermore, the center positioning rod 2 includes a positioning screw 21, a set of locking nuts 22 are installed on the positioning screw 21, and a hole center positioning cone 23 is fixedly installed at the front end of one end.

[0038] Furthermore, a waist groove is provided in the middle of the positioning screw 21, and the radius adjustment rod 1 is inserted in the waist groove and slides back and forth. A set of locking nuts 22 are respectively installed on both sides of the waist hole and locked on the rectangular polished rod of the radius adjustment rod 1 to fix the radius adjustment rod 1.

[0039] Furthermore, the cutting torch positioning device 3 includes a connecting outer ring 31, a locking inner ring 32 is mounted inside the connecting outer ring 31, the locking inner ring 32 rotates inside the connecting outer ring 31, and a cutting torch fixing screw 33 is detachably mounted on one end of the locking inner ring 32.

[0040] Furthermore, the outer circumference of the connecting outer ring 31 is provided with a plurality of bosses, and the bosses are provided with internal threads, one of which is threadedly connected with the external thread at the end of the radius adjustment rod 1, so that the cutting torch positioning device 3 and the radius adjustment rod (1) are installed and fixed together.

[0041] Furthermore, a locking screw 34 is installed in the internal threaded hole of another boss of the connecting outer ring 31 to lock the locking inner ring 32 installed on the connecting outer ring 31 .

[0042] Furthermore, the connecting outer ring 31 has an internal threaded hole of a boss, in which a connecting screw 35 is installed, and a pulley device 36 is installed on the outer periphery of the connecting outer ring 31 through the connecting screw 35 .

[0043] Furthermore, the pulley device 36 includes a slide rod 361, and holes are set at both ends of the slide rod 361. There are multiple holes at one end along the height direction of the slide rod 361, one of which is equipped with a connecting screw 35, and the other end is set to a single hole, in which a roller 362 is installed, and a pulley 363 is rotatably installed on the roller 362.

[0044] Furthermore, the locking inner ring 32 is made of high temperature resistant special engineering plastics.

[0045] When used specifically, the steps for drilling a hole using the on-site hole drilling device for the runner discharge cone of a hydro-turbine generator set are as follows:

[0046] Step 1: Make the cutting torch positioning device 3, which is divided into a connecting outer ring 31, a locking inner ring 32 and a pulley device 36. The connecting outer ring 31, the locking inner ring 32 and the pulley device 36 are processed according to the drawing. The inner diameter of the locking inner ring 32 is slightly larger than the outer diameter of the cutting torch head, and a screw hole is drilled on the upper part of the locking inner ring 32. A cutting torch fixing screw 33 is configured to fix the cutting torch. The inner diameter of the connecting outer ring 31 is slightly larger than the outer diameter of the locking inner ring 32, which is convenient for the tooling to rotate when cutting a circle. The locking screw 34 is installed on the connecting outer ring 31 to fix the locking inner ring 32, and the connecting screw 35 is installed to fix the pulley device 36;

[0047] Step 2: Make the radius adjustment rod 1, and process the radius adjustment rod 1 according to the drawing and set it aside for later use;

[0048] Step 3: Make the center positioning rod 2, select a screw rod with a slightly larger diameter than the radius adjustment rod 1, mill a long waist hole groove slightly larger than the radius adjustment rod 1 in the middle of the screw rod, and install the center positioning cone 23 of the hole at the lower end;

[0049] Step 4: Insert the radius adjustment rod 1 into the waist hole groove in the middle of the center positioning rod 2, and then install the locking nuts 22 at both ends of the center positioning rod 2 to lock the radius adjustment rod 1, screw the external thread at the end of the radius adjustment rod 1 into the internal thread hole of the outer ring 31 of the cutting torch positioning device 3, and set the device aside after it is qualified for debugging;

[0050] Step 5: Determine the hole position on the runner taper cone of the hydro-generator unit according to the drawing requirements, punch the center hole with a sample, and draw the cutting reference line with a ruler;

[0051] Step 6: First, use a carbon arc gouging machine to gouge a small hole outside the cutting line, and then use a handheld plasma cutting gun to cut from the planed hole to the edge of the cutting reference line;

[0052] Step 7: Install the cutting torch head into the locking inner ring 32 of the cutting torch positioning device 3, fix the cutting torch head with the fixing screw 33, loosen the upper locking nut 22, move the center positioning rod 2 back and forth on the radius adjustment rod 1 to make it coincide with the center hole punch, adjust the cutting radius, move the center positioning rod 2 up and down, adjust the cutting nozzle height, loosen the locking screw 34, and allow the locking inner ring 32 to rotate relatively in the connecting outer ring 31;

[0053] Step 8: Start the plasma cutting machine, adjust the cutting current and gas supply pressure range, place the positioning cone 23 on the positioning hole and position it firmly, then press the cutting torch switch to cut a circle along the reference line. Because it is a vertical cutting, one person needs to control the center positioning rod 2 to ensure that the positioning cone 23 does not slide out of the positioning hole, and the other person controls the cutting torch to slide and cut;

[0054] Step 9: After cutting a hole, turn off the cutting torch and repeat steps 5 to 8 to complete the cutting of the next hole.

[0055] In the preferred solution, the radius adjustment rod 1 is a smooth rod in the middle, with external threads set at both ends, and the middle smooth rod part is set to a rectangle; the above setting facilitates the center positioning rod 2 to slide on the radius adjustment rod 1 while facilitating the locking and fixation between the two. The setting of the external thread enables the radius adjustment rod 1 and the cutting torch positioning device 3 to be connected and fixed together.

[0056] In the preferred solution, the center positioning rod 2 includes a positioning screw 21, on which a set of locking nuts 22 are installed, and a hole center positioning cone 23 is fixedly installed at the front end; the above arrangement enables the positioning function of the center positioning rod 2 to be realized while effectively fixing it with the radius adjustment rod 1, thereby making the cutting hole size more accurate.

[0057] In the preferred scheme, a waist groove is provided in the middle of the positioning screw 21, and the radius adjustment rod 1 is inserted in the waist groove and slides back and forth. A group of locking nuts 22 are respectively installed on both sides of the waist hole and locked on the rectangular smooth rod of the radius adjustment rod 1 to fix the radius adjustment rod 1; the above arrangement enables the center positioning rod 2 and the radius adjustment rod 1 to be effectively connected and fixed, and can slide relative to each other, so that the cutting hole radius can be adjusted, thereby further improving the scope of application of the device.

[0058] In the preferred scheme, the cutting torch positioning device 3 includes a connecting outer ring 31, a locking inner ring 32 is mounted inside the connecting outer ring 31, the locking inner ring 32 rotates inside the connecting outer ring 31, and a cutting torch fixing screw 33 is detachably installed circumferentially on one end of the locking inner ring 32; the above arrangement allows the connecting outer ring 31 and the locking inner ring 32 to be relatively fixed while being able to rotate relative to each other, making the cutting process smoother, thereby further improving the cutting quality of the cutting hole and facilitating the operation of the operator, so that smooth cutting of the circular hole can be completed without moving; the arrangement of the cutting torch fixing screw 33 allows the cutting torch to be fixed in the locking inner ring 32, thereby improving the stability of the device in cutting holes.

[0059] In the preferred embodiment, a plurality of bosses are provided on the outer periphery of the connecting outer ring 31, and internal threads are provided on the bosses, one of which is threadedly connected to the external thread at the end of the radius adjustment rod 1, so that the cutting torch positioning device 3 and the radius adjustment rod 1 are installed and fixed together; the above arrangement enables the radius adjustment rod 1 and the cutting torch positioning device 3 to be effectively connected and fixed together.

[0060] In the preferred solution, a locking screw 34 is installed in the internal threaded hole of another boss of the connecting outer ring 31, which is used to lock the locking inner ring 32 installed on the connecting outer ring 31; the above arrangement allows the connecting outer ring 31 and the locking inner ring 32 to be relatively fixed when not in operation, so as to prevent the locking inner ring 32 from falling off from the connecting outer ring 31 along with the cutting torch, thereby facilitating transportation.

[0061] In the preferred solution, the connecting outer ring 31 has an internal threaded hole of a boss, in which a connecting screw 35 is installed, and a pulley device 36 is installed on the outer periphery of the connecting outer ring 31 through the connecting screw 35; the above arrangement ensures the distance between the gun nozzle and the workpiece during the cutting process, while making the cutting movement process smoother, thereby improving the cutting quality.

[0062] In the preferred embodiment, the pulley device 36 includes a slide bar 361, and holes are provided at both ends of the slide bar 361. There are multiple holes at one end along the height direction of the slide bar 361, in which a connecting screw 35 is installed, and a single hole is set at the other end, in which a roller 362 is installed, and a pulley 363 is rotatably installed on the roller 362. The above arrangement enables the function of the wheel changing device 36 to be realized. The multi-hole adjustable design of the slide bar 361 of the pulley device 36 in the height direction further improves the height adjustment range of the cutting torch head and the workpiece of the device, and has a wider range of applications.

[0063] In a preferred solution, the locking inner ring 32 is made of high-temperature resistant special engineering plastics; the above arrangement makes the device resistant to high temperatures and insulated at the same time, thereby improving the safety and reliability of the device and ensuring the safety of operators and equipment.

[0064] To sum up, the on-site hole drilling device for the runner drain cone of a hydro-turbine generator set provided by the utility model realizes the on-site hole drilling of the runner drain cone of the hydro-turbine generator set, reduces the investment in disassembly and assembly and large equipment, and the setting of the center positioning rod 2 of the device enables it to effectively locate and fix the cutting hole center; the setting of the radius adjustment rod 1 makes it suitable for cutting circular holes of different radii; the setting of the pulley device 36 ensures the distance between the gun nozzle and the workpiece during the cutting process while making the cutting movement process smoother; the multi-hole adjustable height design of the slide rod 361 of the pulley device 36 further improves its height adjustment range and has a wider range of application; the new model has ingenious conception, exquisite design, simple and reliable structure, can be widely used in on-site hole drilling of large equipment and parts, has strong practicality, good stability, wide range of application, strong scalability, high promotion value, and has high practical application value, good economic and social benefits.

Claims

1. On-site hole opening device for the runner discharge cone of a hydro-turbine generator set, characterized in that: The invention comprises a radius adjustment rod (1), a center positioning rod (2) is mounted on the radius adjustment rod (1), a cutting torch positioning device (3) is detachably mounted on one end of the radius adjustment rod (1), the cutting torch is fixed in the cutting torch positioning device (3), and a hole is cut by positioning the center through the center positioning rod (2) and positioning the radius through the radius adjustment rod (1).

2. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 1 is characterized in that: The radius adjustment rod (1) has a smooth rod in the middle, external threads are arranged at both ends, and the smooth rod portion in the middle is arranged in a rectangular shape.

3. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 2 is characterized in that: The center positioning rod (2) comprises a positioning screw (21), a set of locking nuts (22) are mounted on the positioning screw (21), and a hole center positioning cone (23) is fixedly mounted at the front end of one end.

4. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 3 is characterized in that: The positioning screw (21) is provided with a through waist groove in the middle, and the radius adjustment rod (1) is inserted into the waist groove and slides forward and backward. A set of locking nuts (22) are respectively installed on both sides of the waist hole and locked on the rectangular polished rod of the radius adjustment rod (1) to fix the radius adjustment rod (1).

5. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 4 is characterized in that: The cutting torch positioning device (3) comprises a connecting outer ring (31), a locking inner ring (32) is sleeved inside the connecting outer ring (31), the locking inner ring (32) rotates inside the connecting outer ring (31), and a cutting torch fixing screw (33) is detachably mounted on one end of the locking inner ring (32) in the circumferential direction.

6. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 5, characterized in that: The outer circumference of the connecting outer ring (31) is provided with a plurality of bosses, and the bosses are provided with internal threads, wherein one of the internal thread holes is threadedly connected to the external thread at the end of the radius adjustment rod (1), so that the cutting torch positioning device (3) and the radius adjustment rod (1) are installed and fixed together.

7. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 6, characterized in that: A locking screw (34) is installed in the internal threaded hole of another boss of the connecting outer ring (31) for locking the locking inner ring (32) installed on the connecting outer ring (31).

8. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 7, characterized in that: The connecting outer ring (31) further has an internal threaded hole of a boss in which a connecting screw (35) is installed, and a pulley device (36) is installed on the outer periphery of the connecting outer ring (31) via the connecting screw (35).

9. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 8, characterized in that: The pulley device (36) comprises a slide bar (361), and holes are arranged at both ends of the slide bar (361). A plurality of holes are arranged at one end along the height direction of the slide bar (361), a connecting screw (35) is installed in one of the holes, and a single hole is arranged at the other end, a roller (362) is installed in the hole, and a pulley (363) is rotatably installed on the roller (362).

10. The on-site hole-drilling device for the runner drain cone of a hydro-generator set according to claim 9, characterized in that: The locking inner ring (32) is made of high-temperature resistant special engineering plastics.

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