CN115138951B - Online repairing method for large hydraulic cylinder cracks - Google Patents
Online repairing method for large hydraulic cylinder cracks Download PDFInfo
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- CN115138951B CN115138951B CN202210915477.7A CN202210915477A CN115138951B CN 115138951 B CN115138951 B CN 115138951B CN 202210915477 A CN202210915477 A CN 202210915477A CN 115138951 B CN115138951 B CN 115138951B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 78
- 238000005520 cutting process Methods 0.000 claims abstract description 51
- 230000008439 repair process Effects 0.000 claims abstract description 31
- 238000005336 cracking Methods 0.000 claims abstract description 21
- 238000005498 polishing Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000011282 treatment Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000003921 oil Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000010727 cylinder oil Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Quality & Reliability (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an online repairing method for large hydraulic cylinder cracks, which comprises the steps of slowly dropping a main cylinder to the lowest position; a group of rib plates are welded at the upper and lower positions of the cracking position A of the main cylinder body at equal intervals, only the position B and the position C are welded between the rib plates and the main cylinder body, and the upper and lower positions of the crack in the middle of each rib plate are not welded at 100 mm; then a plasma cutting machine is selected to repair and cut the cracking part A of the cylinder body, the thickness of the main cylinder body is reserved to be 100mm, and a grinding head is used for repairing and grinding the cutting part after cutting is finished; and then welding the main cylinder body by adopting gas shield welding, after the cylinder body is welded, polishing the welding seam by using a hand-held polishing machine, and after polishing and flattening, detecting a flaw on the welding seam by using a hand-held ultrasonic flaw detector, wherein the flaw detection result has a crack position, and the crack position needs to be polished again for welding treatment. The invention has the advantages that the damaged hydraulic cylinder body is repaired on line, so that the original design capacity of the hydraulic cylinder is basically achieved, the repairing cost is reduced, the repairing efficiency is improved, and the normal operation of production is maintained.
Description
Technical Field
The invention belongs to the technical field of hydraulic cylinder repair of flatting machines, and particularly relates to an online repair method for cracking of a large hydraulic cylinder.
Background
The flattening machine is mainly used for flattening the steel plate with the thickness of 30-120 mm and the thickness of which is not up to standard by a heavy level, so that the flatness of the steel plate meets the requirements of clients. A flattening machine is provided with a main hydraulic cylinder, the weight of the main hydraulic cylinder is about 100T, the unit price of the main hydraulic cylinder is about 300 ten thousand yuan, and the main hydraulic cylinder needs to be replaced by renting a large hydraulic crane and stopping production for about 30 days, and the renting crane and the labor cost of workers are about 83 Mo Zuo. For the above reasons, the main hydraulic cylinder of the flattening machine is generally free of spare parts, so that the processing difficulty is great when a problem occurs. The maximum working pressure of the master cylinder is 32Mpa when working.
The flattening machine is shown in fig. 1, and is a structural schematic diagram of the flattening machine, and comprises a frame housing 1, a main cylinder plunger rod 2, a main cylinder body 4, a main cylinder pull rod screw 3, a main cylinder pressure head 5, a pressed steel plate 6, a lower frame platform 7, a main cylinder oil inlet 8 and a sealing ring 9. When the hydraulic leveling device works, the plunger rod of the main oil cylinder drives the pressure head of the main oil cylinder to move downwards, and pressure is acted on the pressed steel plate, so that the steel plate is leveled. Simultaneously, the inside of the main cylinder body is subjected to upward hydraulic pressure, and the contact part of the outside of the main cylinder body and the frame is subjected to downward resistance of the housing archway. For the above reasons, the master cylinder block had cracks at A, and 4/5 of the circumference had cracks.
Since there is no spare part of the master cylinder, the spare part processing needs at least more than 6 months, but the production cannot be stopped, and the steel plate contract needs to be delivered. Therefore, the main cylinder body must be repaired online, during online repair, the inner cavity of the cylinder body cannot be deformed, the sealing ring in the cylinder body cannot be damaged, the online repair difficulty is very high, and the online repair experience is never provided.
Disclosure of Invention
The invention aims to solve the problems of high repair difficulty, low efficiency and high cost of the hydraulic cylinder body of the existing flatting machine, and provides an online repair method for the large-scale hydraulic cylinder body, which can repair the damaged hydraulic cylinder body on line, so that the damaged hydraulic cylinder body basically reaches the original design capacity of the hydraulic cylinder, the repair cost is reduced, the repair efficiency is improved, and the normal operation of production is maintained.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the online repairing method for the large hydraulic cylinder body cracking comprises the following specific steps:
(1) The cylinder body falls down: the main cylinder pressure head is dropped onto the lower frame platform, accessories such as a connecting oil pipe and a main cylinder pull rod screw rod on the main cylinder body are removed, and the main cylinder body is slowly dropped to the lowest position;
(2) Welding lacing wires: a group of rib plates are welded at the cracking position A of the main cylinder body at equal intervals, the cracking position A is positioned between the upper end and the lower end of each rib plate, only the connecting position B of the upper end of each rib plate and the side wall of the main cylinder body and the connecting position C of the outer side of the lower end of each rib plate and the main cylinder body are welded between the rib plates and the main cylinder body, so that the upper part and the lower part of the cracking of the cylinder body are prevented from being separated and deformed, and meanwhile, the upper part and the lower part of the cracking in the middle of each rib plate are not welded at 100mm positions, so that crack repairing and welding are facilitated;
(3) Crack polishing: combining the crack depth of the cylinder body, selecting a plasma cutting machine to repair and cut the crack position A of the cylinder body, in the crack repair and cutting process, cleaning slag while repairing and cutting the crack, checking the crack, if no crack exists, and if the crack depth is larger than 160mm, continuing repairing and cutting the crack, and keeping the thickness of the main cylinder body by 100mm, so as to prevent the temperature from being directly transmitted to a sealing ring during cutting, causing damage to the sealing ring, repairing and grinding the cutting position by a grinding head after the cutting is finished, and repairing and grinding all cutting surfaces by the grinding head;
(4) Welding a cylinder body: the main cylinder body is welded by adopting gas shield welding, a cylinder body symmetrical sectional layered welding mode is adopted during welding, the length of a welding line at the position D1 is 120mm, the height of a first surfacing layer is 10 mm, after surfacing is finished, the angles of D2, D3, D4, D2, D3 and D4 and D1 are 180 degrees, 90 degrees and 270 degrees in sequence, the temperature of the cylinder body at the welding position is measured by a temperature measuring gun while welding, the temperature of the cylinder body is ensured not to exceed 150 ℃, the welded welding line is immediately insulated by heat insulation cotton, and the welding heat insulation is carried out layer by layer according to the sequence until all welding lines are welded to be flat;
(5) Flaw detection of welding seams of the cylinder body: after the cylinder body is welded, the welding line is polished by using a hand-held polishing machine, the welding line is detected by using a hand-held ultrasonic flaw detector after the polishing is leveled, and the flaw detection result has the crack position to be polished again for welding treatment, and the polishing and the welding are still carried out according to the methods in the step (3) and the step (4).
Further, in the step (2), the size of the rib plate is 16mm thick, 100mm wide and 250mm long, 23 rib plates are altogether, and the interval between two adjacent rib plates is 300mm.
Further, in the step (3), in the cutting process, the temperature measuring gun is used for measuring the cylinder body at the repair position, when the temperature of the main cylinder body reaches 200 ℃, cutting is stopped, and when the temperature of the main cylinder body is reduced to below 100 ℃, cutting is performed.
Further, in the step (3), in order to prevent less deformation during cutting, the cutting is performed in a circumferential opposite manner, that is, the cutting is performed sequentially at the 90-degree equal division positions on the circumference of the main cylinder body cracking position A, instead of continuously cutting from one point.
Further, in the step (3), during polishing, the crack is polished smoothly by a grinding head for the part which is cut to 160mm deep and still has the crack, and the crack is prevented from extending.
Further, in the step (4), if the measured cylinder temperature is not high, the weld length can be prolonged, and if 150 ℃ is reached, the welding is stopped.
Further, in the step (5), installation and debugging are performed after welding is completed, equipment is tried out after the installation and debugging actions are normal, the working pressure of the hydraulic cylinder is controlled within 12MPa for the first week of trial, so that the sealing ring is prevented from being deformed and pulled by the inner cavity of the cylinder, the sealing ring is self-adjusted to be matched with the cylinder by small-pressure actions, and meanwhile whether oil seepage exists at a welding line is checked; after trial for one week, if the hydraulic cylinder normally operates, the working pressure is regulated to 20MPa, and if the hydraulic cylinder still can normally operate for one week, the working pressure is regulated to 25MPa, and the hydraulic cylinder is tried for one month; and if the hydraulic cylinder still operates normally after one month, the working pressure is regulated to 30MPa.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The invention adopts the plasma cutting machine to cut the cracking part A, the plasma cutting machine has high cutting speed and small deformation, and is superior to laser and flame for cutting thick plates;
(2) The invention adopts gas shielded welding, and the welding seam at the thickest part of the main cylinder body reaches 160mm, so the gas shielded welding has higher penetration than the traditional electric welding, and is stronger;
(3) The welded seam is immediately insulated by heat-insulating cotton, so that the aim of slow cooling is to reduce welding stress generated by overlarge temperature difference, ensure that bubbles in a molten pool effectively overflow, and stop the generation of air holes;
(4) The hydraulic cylinder can basically reach the original design capacity through online repair, thereby saving spare part cost, reducing repair cost, improving repair efficiency, prolonging the service life of the hydraulic cylinder and maintaining normal operation of production.
Drawings
FIG. 1 is a schematic view of a prior art flattening machine;
FIG. 2 is a schematic diagram of the main cylinder of the present invention during service;
FIG. 3 is a schematic diagram of welding a rib plate at a crack;
FIG. 4 is a schematic diagram of the crack weld distribution of the present invention;
FIG. 5 is a schematic diagram of a crack weld repair method according to the present invention.
Detailed Description
Example 1
In order that the invention may be more clearly understood, a method for repairing a crack of a large hydraulic cylinder in line with the present invention will be further described with reference to the accompanying drawings, wherein the specific embodiments described herein are for illustration only and not for limitation.
Referring to fig. 1, the flatting mill mainly includes a frame housing 1, a master cylinder plunger rod 2, a master cylinder body 4, a master cylinder pull rod screw 3, a master cylinder pressure head 5, a pressed steel plate 6, a lower frame platform 7, a master cylinder oil inlet 8 and a sealing ring 9, wherein the easy-to-crack position of the master cylinder body 4 is located at a point a, so that the crack position a is repaired on line, and the specific steps are as follows:
(1) The cylinder body falls down: referring to fig. 2, the main cylinder ram 5 is dropped onto the lower frame platform 7, accessories such as a connecting oil pipe and a main cylinder pull rod screw on the main cylinder body 4 are removed, and the main cylinder body 4 is slowly dropped to the lowest position;
(2) Welding lacing wires: referring to fig. 2, a group of rib plates 10 are welded at equal intervals at a cracking position A of a main cylinder body 4, the cracking position A is positioned between the upper end and the lower end of each rib plate 10, the size of each rib plate 10 is 16mm thick, 100mm wide and 250mm long, 23 rib plates are altogether, and the interval between two adjacent rib plates 10 is 300mm;
referring to fig. 3, only the connection part B between the upper end of the rib plate 10 and the side wall of the main cylinder body 4 and the connection part C between the outer side of the lower end of the rib plate 10 and the main cylinder body 4 are welded between the rib plate 10 and the main cylinder body 4, so that the upper part and the lower part of the cylinder body are prevented from being separated and deformed when being cracked, and the upper part and the lower part of a crack in the middle of each rib plate are not welded by 100mm, so that crack repairing and grinding welding are facilitated;
(3) Crack polishing: combining the crack depth of the cylinder body, selecting a plasma cutting machine to repair and cut the crack position A of the cylinder body, cleaning slag while repairing and cutting the crack in the crack repairing and cutting process, checking the crack, if no crack exists, no repair and cutting is performed, if the crack depth is larger than 160mm, no repair and cutting is performed on the crack at the position, and the thickness of the main cylinder body of 100mm must be reserved so as to prevent the temperature from being directly transmitted to the sealing ring during cutting, thereby damaging the sealing ring;
in the cutting process, a temperature measuring gun is used for measuring the cylinder body at the repair position, when the temperature of the main cylinder body reaches 200 ℃, cutting is stopped, and when the temperature of the main cylinder body is reduced to below 100 ℃, cutting is performed at the repair position;
in order to prevent less deformation during cutting, a circumferential top-facing mode is adopted for cutting, namely the circumference of the cracking part A of the main cylinder body is sequentially cut according to 90-degree equal parts instead of continuously cutting from one point, a grinding head is used for grinding the cutting part after the cutting is finished, the grinding head is used for grinding the crack when the cutting is 160mm deep but still has the crack, the crack is smoothly ground, the crack is prevented from extending, and all cutting surfaces are ground and leveled by the grinding head;
(4) Welding a cylinder body: referring to fig. 4 and 5, because the thickest welding seam of the main cylinder body reaches 160mm, the penetration depth of gas shielded welding is higher than that of the traditional electric welding, the welding of the main cylinder body is stronger by adopting gas shielded welding, a symmetrical segmented layered welding mode of the cylinder body is adopted during welding, one welding point D1 is selected firstly, the length of the welding seam at the position of D1 is 120mm, the height of a first surfacing layer is 10 mm, and after surfacing is finished, surfacing is sequentially carried out on D2, D3, D4, and angles formed by D2, D3, D4 and D1 are 180 degrees, 90 degrees and 270 degrees in sequence;
the temperature of the cylinder body at the welding position is measured by a temperature measuring gun at the same time of welding, so that the temperature of the cylinder body is not higher than 150 ℃, if the measured temperature of the cylinder body is not high, the length of a welding seam can be prolonged, if the measured temperature of the cylinder body reaches 150 ℃, welding is stopped, and the welded welding seam is immediately insulated by heat insulation cotton, so that the aim of slow cooling is achieved, the welding stress generated by overlarge temperature difference is reduced, effective overflow of bubbles in a molten pool is ensured, and the generation of air holes is stopped; then carrying out welding and heat preservation layer by layer according to the sequence until all the welding seams are welded flat;
(5) Flaw detection of welding seams of the cylinder body: after the cylinder body is welded, polishing the welding seam by using a hand-held polishing machine, detecting a flaw on the welding seam by using a hand-held ultrasonic flaw detector after polishing and flattening, wherein the flaw detection result has a crack part which needs to be polished again for welding treatment, and polishing and welding are still carried out according to the methods in the step (3) and the step (4);
(6) Trial: after welding is finished, mounting and debugging are carried out, equipment is tried out after the mounting and debugging actions are normal, the working pressure of the hydraulic cylinder is controlled within 12MPa for the first week, so that the sealing ring is prevented from being deformed and pulled by the inner cavity of the cylinder, the sealing ring is self-regulated to be matched with the cylinder by the action of small pressure, and meanwhile whether oil seepage exists at a welding line is checked; after trial for one week, if the hydraulic cylinder normally operates, the working pressure is regulated to 20MPa, and if the hydraulic cylinder still can normally operate for one week, the working pressure is regulated to 25MPa, and the hydraulic cylinder is tried for one month; and if the hydraulic cylinder still operates normally after one month, the working pressure is regulated to 30MPa.
After repairing the cracked part of the damaged cylinder body according to the method provided by the invention, the current working pressure is 30MPa, the normal service time is 1 year, the original design capacity of the hydraulic cylinder is basically achieved, meanwhile, the cost of 300 ten thousand yuan spare parts is saved, the spare parts do not need to be replaced by stopping production, the normal operation of production is ensured, and the time and the labor are saved.
In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (6)
1. The online repairing method for the large hydraulic cylinder body cracking comprises the following specific steps:
(1) The cylinder body falls down: the main cylinder pressure head is dropped onto the lower frame platform, the connecting oil pipe accessory and the main cylinder pull rod screw rod on the main cylinder body are removed, and the main cylinder body is slowly dropped to the lowest position;
(2) Welding lacing wires: a group of rib plates are welded at the cracking position of the main cylinder body at equal intervals, the cracking position is positioned between the upper end and the lower end of each rib plate, only the connection position between the upper end of each rib plate and the side wall of the main cylinder body and the connection position between the outer side of the lower end of each rib plate and the main cylinder body are welded, and meanwhile, the positions of the crack in the middle of each rib plate, which are 100mm up and down, are not welded;
(3) Crack polishing: combining the crack depth of the cylinder body, selecting a plasma cutting machine to repair and cut the crack position of the cylinder body, in the crack repair and cutting process, cleaning slag while repairing and cutting the crack, if no crack exists, repairing and cutting the crack no longer, if the crack depth is larger than 160mm, continuing repairing and cutting the crack at the position, keeping the thickness of the main cylinder body by 100mm, cutting in a circumferential top-cutting mode for preventing less deformation during cutting, namely cutting the crack position of the main cylinder body sequentially at the circumference of the crack position according to the 90-degree uniform position, and polishing the cut position by a grinding head after cutting, wherein all the cut surfaces are polished and leveled by the grinding head;
(4) Welding a cylinder body: the main cylinder body is welded by adopting gas shield welding, a cylinder body symmetrical sectional layered welding mode is adopted during welding, the length of a welding line at the position D1 is 120mm, the height of a first surfacing layer is 10 mm, after surfacing is finished, the angles of D2, D3, D4, D2, D3 and D4 and D1 are 180 degrees, 90 degrees and 270 degrees in sequence, the temperature of the cylinder body at the welding position is measured by a temperature measuring gun while welding, the temperature of the cylinder body is ensured not to exceed 150 ℃, the welded welding line is immediately insulated by heat insulation cotton, and the welding heat insulation is carried out layer by layer according to the sequence until all welding lines are welded to be flat;
(5) Flaw detection of welding seams of the cylinder body: after the cylinder body is welded, the welding line is polished by using a hand-held polishing machine, the welding line is detected by using a hand-held ultrasonic flaw detector after the polishing is leveled, and the flaw detection result has the crack position to be polished again for welding treatment, and the polishing and the welding are still carried out according to the methods in the step (3) and the step (4).
2. The large hydraulic cylinder cracking online repair method according to claim 1, wherein:
in the step (2), the size of the rib plates is 16mm thick, 100mm wide and 250mm long, 23 rib plates are altogether, and the interval between two adjacent rib plates is 300mm.
3. The large hydraulic cylinder cracking online repair method according to claim 1 or 2, characterized in that:
in the step (3), in the cutting process, a temperature measuring gun is used for measuring the cylinder body at the repair position, when the temperature of the main cylinder body reaches 200 ℃, cutting is stopped, and when the temperature of the main cylinder body is reduced to below 100 ℃, cutting is performed.
4. The large hydraulic cylinder cracking online repair method according to claim 1 or 2, characterized in that:
in the step (3), during polishing, the crack is polished smoothly by a grinding head for the crack which is cut to 160mm deep and still has the crack, and crack extension is prevented.
5. The large hydraulic cylinder cracking online repair method according to claim 1 or 2, characterized in that:
in the step (4), if the measured cylinder temperature is not high, the length of the welding line can be prolonged, and if the temperature reaches 150 ℃, the welding is stopped.
6. The large hydraulic cylinder cracking online repair method according to claim 1 or 2, characterized in that:
in the step (5), installation and debugging are carried out after welding is finished, equipment is tried out after the installation and debugging actions are normal, the working pressure of the hydraulic cylinder is controlled within 12MPa for the first week of trial, so that the sealing ring is prevented from being deformed and pulled by the inner cavity of the cylinder, the sealing ring is self-regulated to be matched with the cylinder by the action of small pressure, and meanwhile, whether oil seepage exists at a welding line is checked; after trial for one week, if the hydraulic cylinder normally operates, the working pressure is regulated to 20MPa, and if the hydraulic cylinder still can normally operate for one week, the working pressure is regulated to 25MPa, and the hydraulic cylinder is tried for one month; and if the hydraulic cylinder still operates normally after one month, the working pressure is regulated to 30MPa.
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| CN202210915477.7A CN115138951B (en) | 2022-08-01 | 2022-08-01 | Online repairing method for large hydraulic cylinder cracks |
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| CN115138951B true CN115138951B (en) | 2023-12-15 |
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| CN115846808B (en) * | 2022-11-10 | 2025-12-05 | 一重集团大连核电石化有限公司 | A method for repairing the sealing weld of the upper and lower components of a control rod drive mechanism |
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