CN112360582B - High-medium-pressure non-dummy shaft final assembly method for remanufacturing unit - Google Patents
High-medium-pressure non-dummy shaft final assembly method for remanufacturing unit Download PDFInfo
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- CN112360582B CN112360582B CN202011165082.7A CN202011165082A CN112360582B CN 112360582 B CN112360582 B CN 112360582B CN 202011165082 A CN202011165082 A CN 202011165082A CN 112360582 B CN112360582 B CN 112360582B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
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Abstract
A high-medium pressure non-dummy shaft final assembly method for a reconstruction unit relates to the field of assembly processes of large-scale equipment. The problem that the assembly period of a high-medium-pressure inner cylinder and an inner sleeve of a modification machine set is too long, the working efficiency is low, and the pull-out period is possibly caused by the conventional assembly method is solved. The novel high-medium-pressure part non-dummy shaft assembly method is adopted, a dummy shaft is not needed to be used for aligning all the sleeves, the time for aligning the inner cylinder and all the inner sleeves by the dummy shaft is saved, the dummy shaft is required to be hung and calibrated again when each inner sleeve is aligned, the dummy shaft is required to be arranged in place again when a product is replaced, the assembly requirements of the assembly are guaranteed by the aid of a new assembly process scheme, a large amount of assembly time is saved, and accordingly the overhaul period of an owner can be met, and the working efficiency is improved. The invention is suitable for assembling the high-medium pressure non-dummy shaft of the reconstruction unit.
Description
Technical Field
The invention relates to the field of assembly processes of large-scale equipment, in particular to a high-medium-pressure non-dummy shaft final assembly method for a modified unit.
Background
When a unit assembly is transformed for similar machine types, usually only a high-medium pressure inner cylinder and all internal sleeves are assembled, the high-medium pressure outer cylinder does not return to a factory due to the volume of the outer cylinder, the construction period and other reasons, the inner cylinder and the internal sleeves need to be assembled in the factory under the condition of no outer cylinder, the field overhaul period of the transformed unit is short, the processing period in the factory is short, the conventional dummy shaft is in delay due to the large probability of the assembly method in finding, and the field overhaul progress of the power plant is influenced.
In conclusion, the conventional assembling method is used for assembling the high-medium-pressure inner cylinder and the inner sleeve of the modification machine set for a too long period, so that the working efficiency is low, and the problem of delay is possibly caused.
Disclosure of Invention
The invention provides a high-medium-pressure final assembly method without a dummy shaft for a remanufacturing machine set, aiming at solving the problems that the conventional assembly method is utilized to assemble a high-medium-pressure inner cylinder and an inner sleeve of the remanufacturing machine set, the assembly period is too long, the working efficiency is low, and the delay is possibly caused.
The invention relates to a high-medium-pressure non-dummy shaft final assembly method for a modified unit, which comprises the following specific assembly methods:
firstly, preparing a proper assembly site, arranging a foundation pad box and plane jacks, uniformly arranging the jacks, dropping the lower half of a high-medium pressure inner cylinder on the pad box, leveling the lower half of the inner cylinder, adjusting the level of the lower half of the inner cylinder by adjusting the jacks, requiring that the longitudinal and transverse levels of the high-medium pressure inner cylinder are zero, and firmly pressing the inner cylinder and the pad box by using a pressing plate at a joint where the inner cylinder and an outer cylinder are matched after the level adjustment is qualified;
secondly, checking that the surfaces of the high-medium-pressure inner cylinder and the back arc measuring positions of each inner sleeve are smooth, harmless and free of polishing traces, accurately measuring back arc gaps when subsequent back arcs are centered, and positioning and tightening the support keys at the corresponding positions of the inner sleeves;
thirdly, placing the process gasket in position at the corresponding position of the lower half middle section of the high-pressure inner cylinder, lifting the inner sleeve, placing the inner sleeve on the supporting surface of the outer cylinder, adjusting the inner sleeve to be tightly attached to the axial sealing surface of the high-pressure inner cylinder, and adjusting the height difference between the inner sleeve and the middle section of the high-pressure inner cylinder to be consistent left and right;
measuring left and right gaps of the back arc and hanging an inner sleeve after the back arc is qualified, calculating the eccentricity of the positioning pin through a calculation formula, processing the radial pin according to the size, and inserting the processed radial pin into the corresponding position of the high-medium-pressure inner cylinder;
fifthly, arranging a cushion box and a plane jack according to the upper half size of the high-pressure inner cylinder, hoisting the upper half of the high-pressure inner cylinder, turning over to enable the upper half horizontal surface of the high-pressure inner cylinder to face upwards, and slowly falling into a preassembling table position; adjusting the upper half horizontal and vertical levels of the high-pressure inner cylinder by adjusting the plane jack, wherein the levelness is required to be zero degree;
step six, sleeving the inner sleeves with the half-top process concentric pins in place at the corresponding upper half positions of the high-pressure inner cylinder, and feeding the inner sleeves into the upper half inner part of the high-pressure inner cylinder in a half-safe manner and fixing the inner sleeves through radial pins;
step seven, sequentially hoisting the upper half part of each inner sleeve and the upper half part of each inner cylinder in corresponding positions of the lower half part, and screwing all the split bolts according to the designed torque to finish assembly;
furthermore, the appearance quality requirements of the measuring positions of the middle-high and middle-pressure inner cylinder and the back arcs of the inner sleeves in the second step are not seven harms, the steam seal teeth are not collided, damaged and inclined, and if the steam seal teeth are collided, damaged and inclined, the steam seal teeth are righted;
further, the specific method for measuring the back arc gap in the second step is as follows: the sizes of the inner sleeve and the lower radial pin groove and the sizes of the upper half pin hole and the lower half pin hole of the high-pressure inner cylinder are recorded, the process radial pin is arranged in the lower half of the high-medium-pressure inner cylinder, the process radial pin is installed according to a drawing, and a square ruler is used for checking that the radial pin is not inclined (note that the bottom of the pin is dead against the bottom of the hole);
furthermore, after the machined radial pins are inserted into the corresponding positions of the high-medium pressure inner cylinder in the fourth step, the mounting of the radial pins is checked to be free of deflection by using a square ruler, and the adjusted process gasket is positioned at the corresponding positions of the high-medium pressure inner cylinder; the clearance between the left back arc and the right back arc of the inner sleeve is equal after re-measurement, and the left height difference and the right height difference of the horizontal split surface of the inner sleeve and the high-pressure inner cylinder are consistent;
further, when the sixth step is executed, the height difference between the upper half of the inner sleeve and the horizontal split surface of the high-pressure inner cylinder is ensured to be consistent, and the back arc gaps between the upper half of the inner sleeve and the left and right sides of the upper half of the inner cylinder are measured and recorded;
comparing the gap value between the lower half inner sleeve and the lower half back arc of the high-pressure inner cylinder with the gap value between the upper half inner sleeve and the upper half back arc of the high-pressure inner cylinder to calculate the radial pin size of the upper half inner sleeve, processing the half product pin on each inner sleeve, returning to the re-inspection size after the radial pin size is qualified, then loading the radial pin size into the corresponding position of the upper half of the high-pressure inner cylinder, hanging the radial pin size into the upper half of each inner sleeve, and inspecting that the left and right back arc gaps are equal; after the product is qualified, the upper half sleeves are disassembled.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention overcomes the defects of the prior art, adopts a novel high-medium pressure part non-dummy shaft final assembly method without using a dummy shaft to center each part, saves the time for centering the inner cylinder and each inner sleeve by using the dummy shaft, needs to hoist and calibrate the dummy shaft again in each inner sleeve, needs to position the dummy shaft again when replacing a product pin, also ensures the assembly requirements of the final assembly by using the novel final assembly process scheme, saves a large amount of assembly time, can meet the overhaul period of an owner, and improves the working efficiency.
2. The invention has simple operation and convenient use.
Drawings
FIG. 1 is a cross-sectional view of a unit assembled using a modified high and medium pressure dummy shaft-free final assembly method of the present invention.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1, and the specific assembling method of the high-medium pressure dummy shaft-free final assembly of the modification unit in the present embodiment is as follows:
firstly, preparing a proper assembly site, arranging a foundation pad box and plane jacks, uniformly arranging the jacks, dropping the lower half 1 of the high-medium-pressure inner cylinder on the pad box, leveling the lower half of the inner cylinder, adjusting the level of the lower half of the inner cylinder by adjusting the jacks, requiring that the longitudinal and transverse levels of the high-medium-pressure inner cylinder are zero, and firmly pressing the inner cylinder and the pad box by using a pressing plate at a joint where the inner cylinder and the outer cylinder are matched after the level adjustment is qualified;
secondly, checking that the surfaces of the high-medium-pressure inner cylinder and the back arc measuring positions of each inner sleeve are smooth, harmless and free of polishing traces, accurately measuring back arc gaps when subsequent back arcs are centered, and positioning and tightening the support keys at the corresponding positions of the inner sleeves;
thirdly, placing the technical gasket in position at the corresponding position of the middle section of the lower half 1 of the high-pressure inner cylinder, lifting the inner sleeve, placing the inner sleeve on the supporting surface of the outer cylinder, adjusting the inner sleeve to be tightly attached to the axial sealing surface of the high-pressure inner cylinder, and adjusting the height difference between the inner sleeve and the middle section of the high-pressure inner cylinder to be consistent left and right;
measuring left and right back arc gaps and hanging an inner sleeve after the back arc is qualified, calculating the eccentricity of a positioning pin through a calculation formula, processing the radial pin 2 according to the size, and inserting the processed radial pin 2 into the corresponding position of the high and medium pressure inner cylinder;
fifthly, arranging a cushion box and a plane jack according to the upper half size of the high-pressure inner cylinder, hoisting the upper half of the high-pressure inner cylinder, turning over to enable the upper half horizontal surface of the high-pressure inner cylinder to face upwards, and slowly falling into a pre-assembly table position; the upper half horizontal and the vertical level of the high-pressure inner cylinder are adjusted by adjusting the plane jack, and the levelness is required to be zero degree;
step six, sleeving the inner sleeves with the half-top process concentric pins in place at the corresponding upper half positions of the high-pressure inner cylinder, feeding the inner sleeves into the upper half inner part of the high-pressure inner cylinder in a half-safe manner, and fixing the inner sleeves through the radial pins 2;
step seven, sequentially hoisting the upper half part of each inner sleeve and the upper half part of each inner cylinder in corresponding positions of the lower half part, and screwing all the split bolts according to the designed torque to finish assembly;
according to the specific embodiment, the novel high-medium-pressure part non-dummy shaft final assembly assembling method is adopted, a dummy shaft is not needed to be used for centering each part, the centering time of the inner cylinder and each inner sleeve by the dummy shaft is saved, the dummy shaft needs to be hoisted and calibrated again when each inner sleeve is centered, the dummy shaft needs to be positioned again when a product is replaced, the new final assembly process scheme also guarantees the assembling requirements of the final assembly, and a large amount of assembling time is saved, so that the overhaul period of an owner can be met, and the working efficiency is improved;
when using novel no dummy shaft assembly mode need pay attention to:
1. the inner sleeves are required to be centered and clamped strictly according to technological requirements and processed according to the concentricity of design requirements in the finish machining process;
2. during final assembly, the inner hole or the outer circle of the measuring position of the back arc of the inner sleeve is checked to be finish machined without polishing;
3. when in centering, the height difference between the left side and the right side of the inner sleeve split surface and the inner cylinder split surface needs to be checked, and the allowance is 0.10mm. The method can be used for centering by replacing a dummy shaft with a back arc clearance under the condition that the above conditions are met, otherwise, the centers of all sleeves cannot be ensured.
The second embodiment is as follows: the embodiment is described with reference to fig. 1, and the embodiment is a further limitation of the assembling method described in the first embodiment, and the assembling method for the high-medium pressure false-free shaft assembly of the modification machine set described in the embodiment has the advantages that in the second step, the appearance quality requirements of the back arc measuring positions of the medium-high pressure inner cylinder and each inner sleeve are not damaged, the steam seal teeth are not collided, damaged and tilted, and if the appearance quality requirements are not damaged, the steam seal teeth are righted;
in the second step, the appearance quality requirements of the high-medium-pressure inner cylinder and the inner sleeve back arc measuring positions are not affected by seven, the gland sealing teeth are not collided, damaged and tilted, and if the gland sealing teeth are not collided, damaged and tilted, the gland sealing teeth are righted, so that the appearance quality of the high-medium-pressure inner cylinder and the inner sleeve back arc measuring positions is ensured, and the assembly efficiency is improved.
The third concrete implementation mode: the present embodiment is described with reference to fig. 1, and the present embodiment is a further limitation of the assembling method described in the second embodiment, and the specific method for measuring the back arc clearance in the second step is as follows: the sizes of the inner sleeve upper and lower radial pin grooves and the sizes of the upper half pin hole and the lower half pin hole of the high-pressure inner cylinder are well recorded, the process radial pins are arranged in the lower half of the high-medium-pressure inner cylinder and are installed according to drawings, and a square is used for checking that the radial pins are not inclined;
according to the specific embodiment, the square is used for detecting that the radial pin is not inclined, the success rate of assembly is improved, and abrasion to parts is avoided.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the embodiment is a further limitation to the assembly method described in the first embodiment, and the high-medium pressure and non-dummy shaft assembly method for the remanufacturing machine set described in the fourth embodiment, after the machined radial pin 2 is inserted into the corresponding position of the high-medium pressure inner cylinder, the radial pin is checked to be installed without deflection by using a square ruler, and the adjusted process shim is positioned in the corresponding position of the high-medium pressure inner cylinder; the clearance between the left back arc and the right back arc of the inner sleeve is equal after re-measurement, and the left height difference and the right height difference between the inner sleeve and the horizontal split surface of the high-pressure inner cylinder are consistent.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1, which is a further limitation to the assembly method described in the first embodiment, and the high-medium pressure and non-dummy shaft assembly method for the retrofit set described in the present embodiment ensures that the height difference between the upper half of the inner sleeve and the horizontal mid-plane of the high-pressure inner cylinder is consistent when step six is executed, and actually measures and records the back arc gaps between the upper half of the inner sleeve and the left and right sides of the upper half of the inner cylinder;
comparing the gap value of the lower half back arc between the lower half inner sleeve and the high-pressure inner cylinder with the gap value of the upper half back arc between the upper half inner sleeve and the high-pressure inner cylinder to calculate the radial pin size of the upper half inner sleeve, processing a half product pin on each inner sleeve, returning to the checking dimension after the production, loading the pins into the corresponding position of the upper half of the high-pressure inner cylinder, hanging the pins into the upper half of each inner sleeve, and checking that the left back arc gap and the right back arc gap are equal; disassembling the upper half sleeves after the products are qualified;
in the sixth embodiment, when the step six is executed, the height difference between the upper half of the inner sleeve and the horizontal split surface of the high-pressure inner cylinder must be ensured to be consistent, otherwise, the outer surface and the inner surface of the part are abraded, and the assembly precision is reduced.
Claims (5)
1. The high-medium-pressure non-dummy shaft final assembly assembling method for the reconstruction unit is characterized by comprising the following steps of: the specific assembling method comprises the following steps:
firstly, preparing a proper assembly site, arranging a foundation pad box and plane jacks, uniformly arranging the jacks, dropping the lower half (1) of the high-medium pressure inner cylinder on the pad box, lapping a leveling ruler, adjusting the level of the lower half of the inner cylinder by adjusting the jacks, requiring that the longitudinal and transverse levels of the high-medium pressure inner cylinder are zero, and firmly pressing the inner cylinder and the pad box by using a pressing plate at a lap part where the inner cylinder is matched with the outer cylinder after the level adjustment is qualified;
checking that the surfaces of the high-medium pressure inner cylinder and the back arc measuring positions of the inner sleeves are smooth, harmless and free of polishing traces, accurately measuring back arc gaps when subsequent back arcs are centered, and positioning and tightening the support keys at the corresponding positions of the inner sleeves;
thirdly, placing the process gasket in position at the corresponding position of the middle section of the lower half (1) of the high-and-medium-pressure inner cylinder, hoisting the inner sleeve, placing the inner sleeve on the supporting surface of the outer cylinder, adjusting the inner sleeve to be tightly attached to the axial sealing surface of the high-pressure inner cylinder, and adjusting the height difference between the inner sleeve and the middle section of the high-pressure inner cylinder to be consistent left and right;
measuring left and right gaps of the back arc and hanging an inner sleeve after the back arc is qualified, calculating the eccentricity of the positioning pin through a calculation formula, processing the radial pin (2) according to the size, and inserting the processed radial pin (2) at the corresponding position of the high-medium pressure inner cylinder;
fifthly, arranging a cushion box and a plane jack according to the upper half size of the high-pressure inner cylinder, hoisting the upper half of the high-pressure inner cylinder, turning over to enable the upper half horizontal surface of the high-pressure inner cylinder to face upwards, and slowly falling into a pre-assembly table position; the upper half horizontal and the vertical horizontal of the high-pressure inner cylinder are adjusted by adjusting the plane jack;
step six, sleeving the inner sleeves with the half-top process concentric pins in place at the corresponding upper half positions of the high-pressure inner cylinder, feeding the inner sleeves into the upper half inner part of the high-pressure inner cylinder in a semi-safe manner, and fixing the inner sleeves through the radial pins (2);
and seventhly, hoisting the upper half parts of the inner sleeves and the upper half parts of the inner cylinders in corresponding positions of the lower half parts in sequence, and screwing all the middle split bolts according to the designed torque to finish assembly.
2. The high-medium pressure dummy shaft-free final assembly method of the remanufacturing machine set according to claim 1, wherein: and in the second step, the appearance quality requirements of the middle-high pressure inner cylinder and the back arc measuring positions of the inner sleeves are not influenced by seven, the steam seal teeth are not collided, damaged and inclined, and if the steam seal teeth are damaged, the steam seal teeth are righted.
3. The high-medium pressure dummy shaft-free final assembly method of the remanufacturing machine set according to claim 2, wherein: the specific method for measuring the back arc gap in the second step is as follows: and (3) making size records of the inner sleeve and the lower radius pin slot, the upper half pin hole and the lower half pin hole of the high-pressure inner cylinder, installing the process radial pin in the lower half of the high-pressure and medium-pressure inner cylinder according to a drawing, and checking whether the radial pin is deflected by using a square ruler.
4. The high-medium pressure dummy shaft-free final assembly method of the remanufacturing machine set according to claim 1, wherein: in the fourth step, after the processed radial pin (2) is inserted into the corresponding position of the high-medium pressure inner cylinder, the mounting of the radial pin is checked to be not inclined by using a square ruler, and the adjusted process gasket is put in place at the corresponding position of the high-medium pressure inner cylinder; the clearance between the left back arc and the right back arc of the inner sleeve is equal after re-measurement, and the left height difference and the right height difference between the inner sleeve and the horizontal split surface of the high-pressure inner cylinder are consistent.
5. The high-medium pressure dummy shaft-free final assembly method of the remanufacturing machine set according to claim 1, wherein: when the sixth step is executed, the height difference of the upper half of the inner sleeve and the horizontal split surface of the high-pressure inner cylinder is ensured to be consistent, and the back arc gaps on the left side and the right side of the upper half of the inner sleeve and the upper half of the inner cylinder are measured and recorded;
comparing the gap value between the lower half of the inner sleeve and the lower half of the back arc of the high-pressure inner cylinder with the gap value between the upper half of the inner sleeve and the upper half of the back arc of the high-pressure inner cylinder to calculate the size of the upper half radial pin of the inner sleeve, processing each inner sleeve half product pin, returning to the re-inspection size after the production, then loading the inner sleeve half product pin into the corresponding position of the upper half of the high-pressure inner cylinder, hanging the inner sleeve half product pin into the upper half of each inner sleeve, and inspecting that the left back arc gap and the right back arc gap are equal; and after the product is qualified, the upper half of each internal sleeve is disassembled.
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| CN114233689B (en) * | 2021-12-20 | 2023-06-30 | 沈阳透平机械股份有限公司 | Alignment method for horizontal split large compressor shell and partition plate |
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| GB263582A (en) * | 1925-10-30 | 1927-01-06 | Richardsons Westgarth & Co | Method of supporting steam turbines |
| SU1327625A1 (en) * | 1984-10-24 | 1997-01-27 | Производственное Объединение Турбостроения "Ленинградский Металлический Завод" | Method of assembling cylinders of steam turbine |
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