Hoisting type cutting device based on volute seat ring of pumped storage power station

Abstract

The hoisting type cutting device comprises an operation platform located at the top of the volute seat ring, the periphery of the operation platform is fixedly connected with an external machine base, and a plurality of positioning mechanisms are annularly distributed on the periphery of the bottom of the operation platform; a measuring mechanism for horizontally positioning the cutting device is arranged on the inner side of the positioning mechanism; the positioning mechanism comprises a mounting frame fixedly connected to the bottom of the operation platform, a positioning frame is connected to the mounting frame through a lead screw transmission structure, the end of the positioning frame extends to the outer side of the mounting frame and is connected with a limiting block, and the limiting block is used for limiting the cutting device. The mounting difficulty of the cutting device can be reduced, and the positioning precision of the cutting device can be improved.

Description

Technical Field

[0001] The invention relates to a volute seat ring auxiliary processing device, in particular to a hoisting type cutting device based on a volute seat ring of a pumped storage power station. Background Art

[0002] The volute seat ring is an important part of the water guide mechanism of the pumped storage power station. The bottom ring, top cover, water guide bearing, guide vane and other parts of the turbine are based on the seat ring to adjust the horizontality and verticality, which directly affects the end clearance of the guide vane. This makes the volute seat ring have relatively high requirements for processing accuracy, which needs to be controlled within the error of 0.15mm. Once the deviation is too large, it will cause the coaxiality deviation of the unit to be too large. In severe cases, there will even be problems with the turbine and generator components not being able to be assembled.

[0003] On this basis, when manufacturers use cutting devices to cut the volute seat ring, they will use various measuring sensors to measure the horizontality and roundness of the cutting surface of the volute seat ring to ensure its processing accuracy. However, since the measuring sensors are all measured based on the cutting device, once the cutting device has concentricity and verticality problems, it will cause deviations in its processing and measurement benchmarks, which will seriously affect its processing accuracy and stability. Even if the cutting device is found to have deviations in the later stage, it is difficult for operators to recalibrate the cutting device during the cutting process. This requires that the accuracy of the installation position of the cutting device must be ensured during the early installation process.

[0004] The conventional installation method of the cutting device is to first hoist it into the middle cavity of the volute seat ring through a crane, and then fix it to the installation surface at the bottom of the cavity through a base. However, on the one hand, since its bottom installation surface is not cast based on the volute seat ring, the horizontality of its bottom installation surface does not meet the positioning requirements of the cutting device, that is, the operator is required to level the base according to the installation position of the cutting device during the installation process; on the other hand, since the cutting device does not directly contact the volute seat ring during the installation process, the operator cannot directly use the inner ring of the volute seat ring as the concentricity positioning reference of the cutting device. In addition, due to the limitations of the lifting process, the translation distance of the cutting device is also difficult to accurately control, whether it is crane control or manual traction, there is a large movement deviation. Under the above limitations, the current positioning method of the cutting device is very difficult and random, and the operator needs to continuously test and adjust to make the lifting position of the cutting device close to its error range.

[0005] Therefore, the existing hoisting and positioning method for the volute seat ring cutting device has the problems of difficult operation and low positioning accuracy. Summary of the invention

[0006] The purpose of the present invention is to provide a hoisting type cutting device based on a volute seat ring of a pumped storage power station, which can reduce the difficulty of installing the cutting device and improve the positioning accuracy of the cutting device.

[0007] The technical solution of the present invention is as follows: a hoisting cutting device based on a volute seat ring of a pumped-storage power station comprises an operating platform located at the top of the volute seat ring, the operating platform is fixedly connected to an external machine base on all sides, a plurality of positioning mechanisms are distributed in a ring shape around the bottom of the operating platform, a measuring mechanism for horizontally positioning the cutting device is provided on the inner side of the positioning mechanism; the positioning mechanism comprises a mounting frame fixedly connected to the bottom of the operating platform, a positioning frame is connected to the mounting frame via a screw transmission structure, an end of the positioning frame extends to the outside of the mounting frame and is connected to a limiting block, and the limiting block is used to limit the cutting device.

[0008] In the aforementioned hoisting cutting device based on the volute seat ring of the pumped-storage power station, the measuring mechanism includes two split kits, which are mounted on the outside of the cutting device and are detachably connected. An annular slide groove is formed on the top of the two kits, and an arc plate is snap-connected in the slide groove. A distance sensor is detachably connected to the arc plate. The arc plate is used for the distance sensor to rotate along the axis of the cutting device, and the distance sensor is used to detect the concentricity between the cutting device and the volute seat ring as the arc plate rotates.

[0009] In the aforementioned hoisting cutting device based on the volute seat ring of the pumped-storage power station, the screw transmission structure includes a screw rotatably connected to the mounting frame, the end of the screw is connected to a handwheel, and symmetrical guide rods are provided on both sides of the screw. The middle part of the positioning frame is connected to the screw via a screw nut, and the two sides of the positioning frame are slidably connected to the guide rods.

[0010] In the aforementioned hoisting cutting device based on the volute seat ring of the pumped-storage power station, the inner side of the limit block is rotatably connected to the positioning frame via a rotating shaft, and the outer side of the limit block is slidably connected to an L-shaped plug plate, the top of the plug plate forms an adjustment surface for horizontal positioning, and the outer side of the limit block forms a fitting surface for limiting.

[0011] In the aforementioned hoisting cutting device based on the volute seat ring of the pumped-storage power station, a spirit level is provided on the top of the positioning frame, one side of the spirit level is rotatably connected to the mounting frame, and a mounting hole is formed on the other side of the spirit level. An adjusting screw is provided in the mounting hole, and the end of the adjusting screw is threadedly connected to the mounting frame. An adjusting nut is provided in the middle of the adjusting screw, which is respectively located on the upper and lower sides of the spirit level. The end of the spirit level extends to the outside of the mounting hole and is used to fit the adjustment surface.

[0012] In the aforementioned hoisting cutting device based on the volute seat ring of the pumped storage power station, the distance sensor is a laser rangefinder with a light spot indication function. The distance sensor is connected to the arc plate by rotating in the vertical direction, and the plug plate is provided with a measuring point that cooperates with the distance sensor.

[0013] In the aforementioned hoisting cutting device based on the volute seat ring of the pumped-storage power station, the operating platform is formed by splicing profiles, and a ring-shaped first operating area is formed in the middle of the operating platform. A number of long second operating areas are distributed around the operating platform, and the positioning mechanism is located at the bottom of the second operating area; the first operating area and the second operating area are respectively detachably connected with a first pedal and a second pedal, and the second pedal is provided with a cover plate for the operator to install and take.

[0014] In the aforementioned hoisting type cutting device based on the volute seat ring of the pumped storage power station, the installation method of the hoisting type cutting device comprises the following steps:

[0015] ① Use a crane to hoist the cutting device into the middle cavity of the volute seat ring;

[0016] ② Install an operating platform above the cutting device, and weld and fix the operating platform and the external machine base on all sides;

[0017] ③ The measuring mechanism detects the concentricity between the cutting device and the volute seat ring, and adjusts the horizontal position of some limit blocks according to the eccentric state of the cutting device, so that the limit blocks can intercept and position the cutting device after moving into position;

[0018] ④ The cutting device is horizontally moved toward the limit block by a crane in a hoisting state, so that the side wall of the cutting device is completely in contact with the limit block after the movement; then the horizontal position of another part of the limit block is adjusted so that the limit block is in contact with the cutting device after the limit block is moved into place;

[0019] ⑤ The operator shall install and fix the cutting device under the limit state of the limit block.

[0020] Compared with the prior art, the present invention has the following characteristics:

[0021] (1) The present invention uses the structural coordination of the measuring mechanism and the positioning mechanism to enable the operator to adjust the horizontal position of each limit block according to the concentricity measurement data of the cutting device, and then use the limit block to limit the verticality and horizontal position of the cutting device, so that the cutting device can be quickly positioned by fitting the limit block in the hoisting state, thereby effectively improving its positioning accuracy and facilitating the operation of the operator;

[0022] (2) By defining the structure of the measuring mechanism, the operator can first fix the kit on the outside of the cutting device, and then detect the spacing distance between the cutting device and the inner ring of the volute seat ring by rotating the arc plate, so as to obtain the concentricity position relationship of the cutting device relative to the volute seat ring, thereby realizing its detection function and facilitating the operation of the operator;

[0023] (3) By limiting the structure of the positioning mechanism, after the operating platform is installed, the operator can first adjust the rotation angle of the limit block on the positioning frame according to the horizontality of the adjustment surface, and then quickly locate the horizontality of the level ruler based on the adjustment surface; thereby, the verticality and displacement accuracy of the limit block can be independent of the installation position of the operating platform, that is, the positioning accuracy of the limit block is effectively improved; on this basis, through the structural coordination of the level ruler, the positioning frame and the measuring mechanism, the operator can establish a rectangular coordinate system based on each limit block, and calculate the translation distance of each limit block based on the measurement result of the distance sensor, thereby further improving the detection and installation efficiency of the cutting device;

[0024] Therefore, the present invention can reduce the difficulty of installing the cutting device and improve the positioning accuracy of the cutting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 yes Figure 1 A-direction enlarged view;

[0027] Figure 3 yes Figure 1 B-direction enlarged view;

[0028] Figure 4 yes Figure 1 C-direction view.

[0029] The marks in the accompanying drawings are: 1-operating platform, 2-mounting frame, 3-positioning frame, 4-limiting block, 5-kit, 6-slide groove, 7-arc plate, 8-distance sensor, 9-rotating shaft, 10-plug plate, 11-level ruler, 12-adjusting screw, 13-first operating area, 14-second operating area, 101-adjusting surface, 402-fitting surface. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0031] Embodiment. A hoisting cutting device based on a volute seat ring of a pumped storage power station is constructed as follows Figure 1As shown, it includes an operating platform 1 located at the top of the volute seat ring, the operating platform 1 is fixedly connected to the external machine base on all sides, and a number of positioning mechanisms are distributed in a ring shape around the bottom of the operating platform 1. A measuring mechanism for horizontally positioning the cutting device is provided on the inner side of the positioning mechanism; the positioning mechanism includes a mounting frame 2 fixedly connected to the bottom of the operating platform 1, and a positioning frame 3 is connected to the mounting frame 2 via a screw transmission structure. The end of the positioning frame 3 extends to the outside of the mounting frame 2 and is connected to a limiting block 4, and the limiting block 4 is used to limit the cutting device.

[0032] The measuring mechanism includes two split kits 5, which are sleeved on the outside of the cutting device and connected by bolts at both ends. An annular slide groove 6 is formed on the top of the two kits 5, and an arc plate 7 is snap-connected in the slide groove 6. A distance sensor 8 is detachably connected to the arc plate 7. The arc plate 7 is used for the distance sensor 8 to rotate along the axis of the cutting device. The distance sensor 8 is used to detect the concentricity between the cutting device and the volute seat ring as the arc plate 7 rotates.

[0033] The screw transmission structure includes a screw that is rotatably connected to the mounting frame 2, a handwheel is connected to the end of the screw, symmetrical guide rods are provided on both sides of the screw, the middle part of the positioning frame 3 is connected to the screw via a screw nut, and the two sides of the positioning frame 3 are slidably connected to the guide rods.

[0034] The inner side of the limit block 4 is rotatably connected to the positioning frame 3 via the rotating shaft 9, the rotating shaft 9 and the limit block 4 are key-connected, the external thread of the rotating shaft 9 is connected with a round nut, and the round nut is used to rotationally limit the rotating shaft 9 after tightening, the external side of the limit block 4 is slidably connected with an L-shaped plug plate 10 via a T-shaped sliding groove, the top of the plug plate 10 forms an adjustment surface 101 for horizontal positioning, the outer side of the limit block 4 forms a fitting surface 402 for limiting, and the sliding direction of the plug plate 10 is arranged parallel to the fitting surface 402.

[0035] A level 11 is provided on the top of the positioning frame 3, one side of the level 11 is rotatably connected to the mounting frame 2, and a mounting hole is formed on the other side of the level 11. An adjusting screw 12 is provided in the mounting hole, and the end of the adjusting screw 12 is threadedly connected to the mounting frame 2. An adjusting nut is provided in the middle of the adjusting screw 12, which is respectively located on the upper and lower sides of the level 11. The end of the level 11 extends to the outside of the mounting hole and is used to fit the adjustment surface 101.

[0036] The distance sensor 8 is a laser rangefinder with a light spot indication function. The distance sensor 8 is connected to the arc plate 7 by rotating in the vertical direction. The distance sensor 8 is in a horizontal state when in a low position and in an inclined upward state when in a high position. A measuring point matching the distance sensor 8 is provided on the plug plate 10.

[0037] The operating platform 1 is formed by splicing profiles, and is connected with guardrails on all sides of the operating platform 1. A ring-shaped first operating area 13 is formed in the middle of the operating platform 1, and a plurality of long second operating areas 14 are distributed around the operating platform 1. The positioning mechanism is located at the bottom of the second operating area 14; the first operating area 13 and the second operating area 14 are respectively detachably connected with a first pedal and a second pedal, and the second pedal is provided with a cover for the operator to install and take; the middle of the operating platform 1 is fixedly connected to the cutting device via a connecting seat, and the connecting seat is installed after the cutting device is positioned.

[0038] The installation method of the hanging type cutting device comprises the following steps:

[0039] ① Use a crane to hoist the cutting device into the middle cavity of the volute seat ring, and install a base for supporting the cutting device at the bottom of the cavity;

[0040] ② Install the operating platform 1 above the cutting device, weld and fix the operating platform 1 around the external machine base, and then lay the second pedal on the operating platform 1 to leave space for operators to step on and operate. The first pedal and cover plate are not laid for the time being, so that the crane can pass through the operating platform 1 to hoist the cutting device and move it;

[0041] After the operating platform 1 is installed, the operator calibrates each positioning mechanism respectively; that is, the limit block 4 is first rotated and positioned by the cooperation of the level meter and the plug plate 10, so that the fitting surface 402 is kept in a vertical state after positioning and tightened; then the plug plate 10 is slid to fit with the level ruler 11, and the level ruler 11 is rotated according to the cooperation of the adjustment surface 101 and the adjustment nut, so that the level ruler 11 is in a horizontal state after being rotated into place;

[0042] ③ Two sets 5 are sleeved on the pillars in the middle of the cutting device and connected by bolts, and then the arc plate 7 with the distance sensor 8 is buckled into the slide groove 6 at the top of the set 5, so that the arc plate 7 can slide along the slide groove 6, and the height of the distance sensor 8 is consistent with the inner circle of the volute seat ring;

[0043] After the arc plate 7 is installed, the operator turns on the distance sensor 8 and rotates the arc plate 7 so that the distance sensor 8 faces each plug plate 10, and then detects the distance of the volute seat ring below the plug plate 10 in turn, thereby obtaining the offset size of the cutting device relative to the volute seat ring; after the measurement is completed, the operator turns the hand wheel to adjust the axial position of the limit block 4 according to the offset distance of the cutting device, so that it can intercept and position the cutting device after it is in place;

[0044] ④ Move the cutting device horizontally toward the limit block 4 in the hoisting state, so that the cutting device fits tightly with the limit block 4 on one side after hoisting; when the cutting device completely fits the limit block 4, it means that the cutting device reaches the concentric position, and then the operator controls the translation of the remaining limit blocks 4, so that each limit block 4 can squeeze the side wall of the cutting device from all sides, that is, prevent the cutting device from re-shifting during subsequent installation;

[0045] ⑤ Fine-tune the base according to the horizontal position of the cutting device, then use the crane to place the cutting device on the base in the limited state, and level the base according to the bottom installation surface of the cutting device, then fix the lower end of the cutting device on the base, and use the operating platform 1 to fix the upper end of the cutting device, and finally lay the first pedal and cover plate to complete the installation.

[0046] The present invention coordinates the structures of the operating platform 1, the positioning mechanism and the measuring mechanism so that the inner ring of the volute seat ring is used as the basic surface to locate the installation position of the cutting device, and then uses the positioning mechanism to hard limit the cutting device, so that the cutting device can be quickly moved to the positioning position and complete subsequent installation operations in the limited state, thereby effectively improving the installation efficiency and positioning accuracy of the cutting device and avoiding the cutting device from re-shifting after positioning.

Claims

1. A hoisting cutting device based on the volute seat ring of a pumped storage power station, characterized in that: The invention comprises an operating platform (1) located at the top of a volute seat ring, the operating platform (1) being fixedly connected to an external machine base around its periphery, a plurality of positioning mechanisms being distributed in a ring shape around the bottom of the operating platform (1), a measuring mechanism for horizontally positioning a cutting device being provided on the inner side of the positioning mechanism; the positioning mechanism comprises a mounting frame (2) fixedly connected to the bottom of the operating platform (1), a positioning frame (3) being connected to the mounting frame (2) via a screw transmission structure, an end of the positioning frame (3) extending to the outer side of the mounting frame (2) and connected to a limiting block (4), the limiting block (4) being used to limit the cutting device.

2. The hoisting cutting device based on the volute seat ring of the pumped storage power station according to claim 1 is characterized in that: The measuring mechanism comprises two separate sets (5), the two sets (5) are sleeved on the outside of the cutting device and are detachably connected, an annular slide groove (6) is formed on the top of the two sets (5), an arc plate (7) is buckled and connected in the slide groove (6), and a distance sensor (8) is detachably connected to the arc plate (7), the arc plate (7) is used for the distance sensor (8) to rotate along the axis of the cutting device, and the distance sensor (8) is used to detect the concentricity between the cutting device and the volute seat ring as the arc plate (7) rotates.

3. The hoisting cutting device based on the volute seat ring of the pumped storage power station according to claim 1 is characterized in that: The screw transmission structure comprises a screw which is rotatably connected to a mounting frame (2), the end of the screw is connected to a hand wheel, symmetrical guide rods are arranged on both sides of the screw, the middle of the positioning frame (3) is connected to the screw via a screw nut, and both sides of the positioning frame (3) are slidably connected to the guide rods.

4. The hoisting cutting device based on the volute seat ring of the pumped storage power station according to claim 2 is characterized in that: The inner side of the limit block (4) is rotatably connected to the positioning frame (3) via a rotating shaft (9); the outer side of the limit block (4) is slidably connected to an L-shaped plug plate (10); the top of the plug plate (10) forms an adjustment surface (101) for horizontal positioning; and the outer side of the limit block (4) forms a fitting surface (402) for limiting.

5. The hoisting cutting device based on the volute seat ring of the pumped storage power station according to claim 4 is characterized in that: A level ruler (11) is provided on the top of the positioning frame (3), one side of the level ruler (11) is rotatably connected to the mounting frame (2), the other side of the level ruler (11) forms a mounting hole, an adjusting screw rod (12) is provided in the mounting hole, the end of the adjusting screw rod (12) is threadedly connected to the mounting frame (2), the middle of the adjusting screw rod (12) is provided with adjusting nuts respectively located on the upper and lower sides of the level ruler (11), and the end of the level ruler (11) extends to the outside of the mounting hole and is used to fit the adjustment surface (101).

6. The hoisting cutting device based on the volute seat ring of a pumped storage power station according to claim 4 is characterized in that: The distance sensor (8) is a laser distance meter with a light spot indication function. The distance sensor (8) is rotatably connected to the arc plate (7) in a vertical direction. The plug plate (10) is provided with a measuring point that matches the distance sensor (8).

7. The hoisting cutting device based on the volute seat ring of a pumped storage power station according to claim 1 is characterized in that: The operating platform (1) is formed by splicing profiles, a first annular operating area (13) is formed in the middle of the operating platform (1), a plurality of second long strip operating areas (14) are distributed around the operating platform (1), and the positioning mechanism is located at the bottom of the second operating area (14); the first operating area (13) and the second operating area (14) are respectively detachably connected with a first pedal and a second pedal, and the second pedal is provided with a cover plate for an operator to install and remove.

8. The hoisting cutting device based on the volute seat ring of a pumped storage power station according to any one of claims 1 to 7, characterized in that: The installation method of the hanging type cutting device comprises the following steps: ① Use a crane to hoist the cutting device into the middle cavity of the volute seat ring; ② Install an operating platform above the cutting device, and weld and fix the operating platform and the external machine base on all sides; ③ The measuring mechanism detects the concentricity between the cutting device and the volute seat ring, and adjusts the horizontal position of some limit blocks according to the eccentric state of the cutting device, so that the limit blocks can intercept and position the cutting device after moving into position; ④ The cutting device is horizontally moved toward the limit block by a crane in a hoisting state, so that the side wall of the cutting device is completely in contact with the limit block after the movement; then the horizontal position of another part of the limit block is adjusted so that the limit block is in contact with the cutting device after the limit block is moved into place; ⑤ The operator shall install and fix the cutting device under the limit state of the limit block.

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