CN103255454A - Repair process of scrapped piston rods - Google Patents
Repair process of scrapped piston rods Download PDFInfo
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- CN103255454A CN103255454A CN2013102270956A CN201310227095A CN103255454A CN 103255454 A CN103255454 A CN 103255454A CN 2013102270956 A CN2013102270956 A CN 2013102270956A CN 201310227095 A CN201310227095 A CN 201310227095A CN 103255454 A CN103255454 A CN 103255454A
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Abstract
The invention relates to a surface damage repair process and in particular relates to a repair process of scrapped piston rods of hydraulic servo cylinders in industries of metallurgy, chemical industry, mine and the like, cylinder rods with a big draw ratio, large-scale hydraulic cylinders and cylinder piston rods. The repair process is used for performing an iron and chromium double-layer electroplating process on the scrapped piston rods, so that double electroplating layers comprising an iron-plating layer and a chromium-plating layer are formed on the surface of each scrapped piston rod. The repair process comprises the following specific steps of: performing preplating treatment; plating iron, wherein the iron-plating layer has the thickness of 1-5 mm; and plating chromium, wherein the chromium-plating layer has the thickness of 0.03 to 0.05 mm. A double electroplating technology is adopted for repairing, so the repair cycle is short, the cost is low and the performance is reliable. The defects that the piston rods of the servo hydraulic cylinders, the piston rods of the hydraulic cylinders with a big draw ratio and hollow piston rods of plunger cylinders is complex in structure, high in required precision, complex in process, high in processing difficulty, easy to deform during heat treatment, long in processing cycle and high in cost and cannot be welded, and the requirement on the thickness of the plating layer cannot be met only by virtue of chromium plating are overcome.
Description
Technical field
The present invention relates to a kind of surface damage renovation technique, particularly relate to a kind of hydraulic servo cylinder that is mainly used in industries such as metallurgy, chemical industry, mine, the cylinder bar that length-to-diameter ratio is big, and the renovation technique of scrapping piston rod of other large hydraulic cylinder and cylinder piston rod.
Background technology
Hydro-cylinder is power element important in the hydraulic efficiency system, is widely used in the engineering machinery such as metallurgy, chemical industry, mine, building, transportation, and it is the device that fluid can be converted to the translational motion mechanical force.Piston rod is the vitals of hydro-cylinder, and it adopts 35,45 usually, highquality carbon steels such as 27Ci2MnA, 42CrMo are made.For wear resistance and the erosion resistance that improves piston rod, present domestic traditional technology is given the chrome-faced of piston rod.Owing to the reason of work and the influence of severe environment, the surface of piston rod defectives such as groove mark, pit occur very easily by serious quick-fried plating with pull, and causes hydraulic cylinder piston rod to move axially leakage of oil and makes it can't works better.And owing to the limitation of its chromium layer thickness and the reason of bonding force decline, can not satisfy the dimension precision requirement that piston rod is repaired again, particularly servo hydraulic cylinder piston rod construction technology is quite complicated, the user can only order to original production producer, it is long to order piston rod price height, cycle, has a strong impact on normally carrying out of production work.
In the production practice, for losing efficacy or approaching piston rod, especially the servo-hydraulic cylinder piston rod of scrapping, the piston rod that length-to-diameter ratio is big, owing to its structural manufacturing process complexity, price height, the cycle is long.The applicant attempts to adopt the method for processing welding to repair.Because of piston rod C(carbon) the content height, the hardness height, the fragility height, speed of cooling is fast, and the yielding carbon compound that is prone to cracks, so take the processing method of welding, has significant limitation, and operational risk is big, is difficult for successfully.
For piston rod to explore convenient, the rational repair process of a cover be construction machinery industry important topic always.Through the verification of applicant's preliminary search, still there is not the relevant report of this respect both at home and abroad so far.
Summary of the invention
Goal of the invention of the present invention is to solve the defective that prior art is repaired piston rod technology, provides a kind of hardness moderate, high-wearing feature, and strong bonding force, antiseptic property is strong, the double-deck reparation of scrapping piston rod of electroplating of the employing of stable mechanical property
Technology.
Realize the foregoing invention purpose by the following technical solutions: a kind of renovation technique of scrapping piston rod, this renovation technique is the double-deck electroplating technology of implementing the iron chromatize to the piston rod of scrapping, makes the surface of scrapping piston rod form double-deck electrolytic coating, one deck plating iron layer, one deck Du Chrome layer, concrete steps comprise:
A, plating pre-treatment:
A. the piston rod of scrapping is carried out turning, polishing processing;
B. remove greasy dirt, the rust of the piston rod surface of scrapping;
B, plating iron
A. adopt the symmetric alternating current activation method that the piston rod of scrapping is carried out etching processing, the piston rod that to scrap is put into 35～45 ℃, the solution of ferrous chloride of pH value 0.6～0.9, relative concentration 1.21～1.23, utilize the symmetric alternating current surge, the surface to be plated of the piston rod that activation is scrapped, after treating that surface metal gloss obviously weakens, apply a rush current, make forward current density greater than negative current density, progressively regulate forward or negative current density then, make it last excessively to direct current electrode position, the plating iron layer thickness is 1～5 mm;
B. the piston rod that takes out after the plating iron cleans, and soaks 20min～30min in 5%～10% alkaline solution, washing, oven dry;
C, chromium plating
A. with grinding machine cylindrical grinding on the piston rod after the plating iron, reach tolerance of dimension f7, surface roughness Ra 0.4～0.2 μ m carries out hard chrome plating;
B. adopt efficient chromium plating liquid chromium plating, use high current density at 70A/dm
2Following chromium plating, the microhardness of the high HEFF-25 of hardness of chromium coating is HV900～1000, chromium coating thickness is 0.03～0.05 mm.
Further, described plating is less than 70A/dm in current density
2Environment under carry out.
Further, the technological specification of described solution of ferrous chloride: iron protochloride-350～400gL
-1, sodium-chlor-10～20gL
-1, manganous chloride-1～5gL
-1, boric acid-5～8gL
-1, pH value: 1～2, temperature: 30～55 ℃, anodic current density/Adm
-2: 15～30.
Further, the metallic impurity in the described efficient chromium plating liquid are less than 7.5g/L, and fluorochemical is smaller or equal to 0.2g/L, and chlorion is smaller or equal to 100mg/L.
Further, described efficient chromium plating liquid is to be added with one or more organic additives and the auxilliary chromium plating bath that adds a spot of mineral compound.
Further, described organic additive is CF-201 or CB-B additive, and mineral compound is chromic trioxide or sulfuric acid.
Further, described chromium coating has 400/cm crackle bar.
Adopt technique scheme, compared with prior art, remarkable advantage of the present invention is: for piston rod surface groove mark dark (1～5mm), area is bigger, and pit is serious, the cylinder bar that the hydraulic servo cylinder of quick-fried plating in blocks and length-to-diameter ratio are big, adopt double-deck electroplating technology to repair, repairing efficiency is short, and expense is low, dependable performance.Servo-hydraulic cylinder piston rod, hydraulic cylinder piston rod that length-to-diameter ratio is big have been solved, and the hollow piston bar of plunger case is because its complex structure, the precision prescribed height, complex process, difficulty of processing is big, and thermal treatment is yielding, process-cycle is long, the cost height can not weld, and can not satisfy the defective that the coating dimensional thickness requires again only according to chromium plating.The servo-hydraulic cylinder piston rod is made and is equivalent to 30% of original product price, and cost reduces by 40%～60%, and the life-span is improved 2～3 times.Have advantages such as energy-conservation, material-saving, environmental protection, high-quality.A kind of have higher hardness, high-wearing feature, erosion resistance, strong bonding force are provided, are convenient to processing, stable performance be suitable for all types of hydraulic cylinder piston rod re-manufacturing technologies.
Embodiment
The present invention will be further described below in conjunction with embodiment.
Present embodiment discloses a kind of all kinds of hydraulic cylinder piston rods that are specifically designed to, and especially for the structural manufacturing process complexity, precision is had relatively high expectations relatively, cost of manufacture height, the renovation technique of manufacturing again of the hydraulic servo cylinder piston rod that the cycle is long.Its design philosophy is: will scrap piston rod surface, remove defectives such as groove mark, pit, quick-fried plating through processing, utilize double-deck electroplating technology, elder generation's plating iron, on the basis of plating iron, hard chrome plating again, form double-deck electrolytic coating on the surface of scrapping piston rod, one deck plating iron layer, one deck Du Chrome layer makes and scraps piston rod and recovered.Its operation steps is:
1. plating pre-treatment:
A. the piston rod that will scrap carries out turning, polishing is handled.
B. remove greasy dirt, the rust of the piston rod surface of scrapping.
2. plating iron:
A. adopt the symmetric alternating current activation method that the piston rod of scrapping is carried out etching processing, the piston rod that to scrap is put into 35～45 ℃, the solution of ferrous chloride of pH value 0.6～0.9, relative concentration 1.21～1.23, the technological specification of solution of ferrous chloride: iron protochloride-350～400gL
-1, sodium-chlor-10～20gL
-1, manganous chloride-1～5gL
-1, boric acid-5～8gL
-1, pH value: 1～2, temperature: 30～55 ℃, anodic current density/Adm
-2: 15～30.Utilize the symmetric alternating current surge, the surface to be plated of the piston rod that activation is scrapped, after treating that surface metal gloss obviously weakens, apply a rush current, make forward current density greater than negative current density, progressively regulate forward or negative current density then, make it last excessively to direct current electrode position, the plating iron layer thickness is 1～5mm.
B. the piston rod that takes out after the plating iron cleans (NaOH or Na in 5%～10% alkaline solution
2CO
3) soak 20min～30min, washing, oven dry.
3. chromium plating
A. with grinding machine cylindrical grinding on the piston rod after the plating iron, reach tolerance of dimension f7, surface roughness Ra 0.4～0.2 μ m carries out hard chrome plating.
B. adopt efficient hard chrome plating, in current density 70 less than A/dm
2Environment under descend chromium plating, the microhardness of the high HEFF-25 of hardness of chromium coating is HV900～1000, chromium coating thickness is 0.03～0.05 mm.
Metallic impurity in the efficient chromium plating bath are less than 7.5g/L, and fluorochemical is smaller or equal to 0.2g/L, and chlorion is smaller or equal to 100mg/L.Add CF-201 additive-WR-1.1～2gL in the efficient chromium plating liquid
-1Or CB-B additive/mlL
-1-CR
3+＜4 and add mineral compound chromic trioxide (CrO3)-140～180gL
-1Or sulfuric acid (H2SO4)-0.4～1.0gL
-1, add 0.7% additive and mineral compound in the efficient chromium plating liquid by weight, add the mixture of 0.7 kilogram of additive and mineral compound in 100 kilograms of efficient chromium plating liquids, additive accounts for 80%, and mineral compound accounts for 20%.
Chromium coating has 400/cm crackle bar.
Principle of work of the present invention:
It is darker because of the groove mark size that the present invention is primarily aimed at piston rod, serious wear, and the limitation of chromium plating thickness, the problem that bonding force descends proposes.It is the restriction that is not subjected to thickness of coating because of it that renovation technique at first adopts plating iron, has not only remedied the defective of chromium plating, has very high hardness (HRC40～60) and wear resistance again.Chemical Composition similar to technically pure iron (Fe 99.5%, C≤0.04%), but the hardness ratio pure iron is high 5～10 times.This is owing to there being superfine crystal particle to strengthen, and is stress reinforced, the event of dispersion-strengthened.Since the purity height, good corrosion resistance, etch ratio ordinary low-carbon steel low 40%.Plating iron layer single face thickness can reach 1～5mm.Piston rod through turning, the polishing after, surface roughness Ra 0.4～0.2 μ m.The bonding force of plating iron layer and matrix is most critical, and the key factor that influences bonding force is the plating pre-treatment.Make plating piece surface cleaning and obviously exposed its crystal structure.At first carry out oil removing, rust, carry out etching processing then.Adopt the ferrous plating iron of low temperature chlorination, save the energy, it is fast to have sedimentation velocity, current efficiency height, characteristics such as coating hardness height (HRC40～60) ferrous oxidation is slow, and is relatively stable.
Chromium is a kind of silvery white metal, though electropotential is very negative, it has very strong purification performance, very fast purifying in atmosphere.The chromium layer is very stable in atmosphere, can keep its gloss for a long time.Highly stable in corrosive mediums such as alkali, nitric acid, sodium sulphite, carbonate and organic acid.Chromium layer hardness height, wear resistance is good, and reflecting power is strong, and better heat-resisting is arranged.Below 500 ℃, gloss and hardness have no significant change.Hard chrome plating is adopted according to the Working environment requirement in the hydraulic cylinder piston rod surface, and purpose is to utilize the high rigidity of chromium layer, wear resistance, and erosion resistance.To improve the piston rod wear resistance, prolong its work-ing life.
The present invention adopts efficient hard chrome plating, and it is that High Effi-Ciency.Etch Free means high-level efficiency and do not have corrosion that this technology abbreviates HEET(as).Fluorine-containing hardly in the plating bath, so do not corrode the low current density district of plating piece.When anodic current density is 60A/dm
2The time, its current efficiency can reach 25%, and efficient chromium plating liquid is to add one or more organic additives again and assist to add a spot of mineral compound on the basis of traditional chromium plating solution, and mineral compound is chromic trioxide (CrO3)-140～180gL
-1Or sulfuric acid (H2SO4)-0.4～1.0gL
-1, organic additive is CF-201 additive-WR-1.1～2gL
-1Or CB-B additive/mlL
-1-CR
3+＜4, make it obtain good performance.
Efficient chromed hardened process characteristic:
1, have higher current efficiency and settling velocity, cathode efficiency is
22%～27%, more traditional chromium plating liquid exceeds one times.Thereby the reduction current draw, because efficient hard chrome plating adopts higher current density, sedimentation velocity can significantly improve.
2, the microhardness of the high HEFF-25 of hardness of chromium layer is HV900～1000.
3, wear resistance generally can improve 20%, and sliding friction improves 25%.
4, chromium coating has higher crackle bar, is 400/cm.Because the chromium layer is the crackle tissue, thereby corrosion is disperseed, improve erosion resistance.
5, use high current density at 70A/dm
2Below electroplate.Generally can not produce coating and burn, and coarse phenomenon, fluoride not in this plating bath in addition, workpiece low current density district can not produce erosion.
6, the dispersive ability of plating bath is better than traditional chromium plating.
7, efficient chromium plating liquid of the present invention is to add one or more organic additives and assist on the basis of traditional chromium plating solution to add a spot of mineral compound.Metallic impurity in the chromium plating liquid of the present invention are lower than 7.5g/L, and fluorochemical is not more than 0.2g/L, and chlorion is no more than 100mg/L, and efficient chromium plating liquid adds 0.7% organic additive and mineral compound by weight.
For improving coating and matrix metal bonding force, in general increase with thickness of coating, the bonding force of coating and matrix metal reduces, and fragility increases, and part strength reduces.To bonding force play a decisive role be the plating pre-treatment.Should take suitable anodizing to remove surface contaminants and oxide film according to base material character especially, expose the matrix crystal structure, plating then could ensure bonding force.
Service test embodiment
Embodiment 1:
Hebei iron and steel group, 3200m
3Blast furnace TRT generating set, hydraulic servo is adjusted cylinder, amounts to 6, seriously pulls because of piston rod surface, closely scraps, and every is worth 150,000 yuans.Only piston rod is one 4.5 ten thousand yuan.
The piston rod material: 42CrMo quenched and tempered steel, Chemical Composition: C 0.42%, Mo 0.95%～1.5%, thermal treatment HBW 217～255, bar footpath Φ 75mm, long 800mm, axial bore Φ 15mm is elongated, outer round surface hard chrome plating δ=0.05mm, surface roughness Ra 0.2 μ m.This piston rod belongs to sensing control such as position, time, speed, and structural manufacturing process is complicated, and the user can only order to producer, price height not only, cycle long (one month) and have a strong impact on production.
According to the concrete degree of impairment of this piston rod, formulated personalized renovation technique scheme, its operation steps is as follows:
At first, piston rod is carried out turning, polishing processing, make this piston rod surface roughness reach Ra0.4 μ m, outside dimension Φ 72-0.1.
Secondly, carry out etching processing, adopt the symmetric alternating current activation method that the piston rod of scrapping is carried out etching processing, the piston rod that to scrap is put into 35～45 ℃, the solution of ferrous chloride of pH value 0.6～0.9, relative concentration 1.21～1.23, utilize the symmetric alternating current surge, the surface to be plated of the piston rod that activation is scrapped, after treating that surface metal gloss obviously weakens, apply a rush current, make forward current density greater than negative current density, progressively regulate forward or negative current density then, make it last excessively to direct current electrode position, plating iron thickness 2mm.
Then, the piston rod water that takes out after the plating iron cleans, and puts it into (NaOH or Na in 5%～10% the alkaline solution
2CO
3) soak 25min, wash oven dry again with water.
Then, chromium plating
With grinding machine cylindrical grinding on the piston rod of outside dimension after the plating iron: Φ 76, reach Φ 75-0.1 behind the cylindrical grinding, surfaceness 0.2 μ m carries out hard chrome plating;
Adopt efficient chromium plating liquid hard chrome plating, add chromic trioxide (CrO3)-140～180gL of 13.9% by weight in the efficient chromium plating liquid
-1With CF-201 additive-WR-1.1～2gL
-1, in current density 70 less than A/dm
2Environment under descend chromium plating, the microhardness of the high HEFF-25 of hardness of chromium coating is HV900～1000, hard chrome plating δ=0.05mm, mill back Φ 75f7(-0.04) mm, Ra0.2 μ m, Performance Detection after assembling: hardness HRC67～68.5, wear resistance improves 20%, and sliding friction improves 25%.Operating pressure 16MPa, experimental pressure: 24MPa, every index is all normal, zero leakage.Life cycle doubles.1.5 ten thousand yuan/of piston rod costs are equivalent to 1/3 of original cost.Repairing efficiency 10 days shortens 20 days than purchasing original paper.
Embodiment 2:
The southeast, Jiangsu iron and steel group: steel-making converter is repaired special-purpose telescopic hydraulic cylinder, totally 3 joints, and stroke reaches 15 meters, and wherein joint (2#) hollow cylindrical is seriously pulled zanjon 1.5mm, long 900mm, pit 20 many places that differ in size.Long 5.5 meters of this piston rod, hollow, material: 45, for preventing deformation can not be welded, repair through our double-deck electroplating technology technology, the normal use, 1 year, every index was all normal.(renovation technique is with embodiment 1)
Embodiment 3:
Tangshan plate of moderate thickness material company limited mill, the cold bed plunger case, totally 4, stroke: 1.5 meters, operating pressure 25MPa, the bar footpath: Φ 320mm(is hollow), long 1.6 meters, material: 45, cylindrical is pulled seriously, and the degree of depth/length and quantity do not wait.Through the reparation of our double-deck electroplating technology, present works better.(renovation technique is with embodiment 1)
Above-described embodiment has only been expressed the specific embodiment of the present invention, can not therefore be interpreted as limitation of the scope of the invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (7)
1. a renovation technique of scrapping piston rod is characterized in that, this renovation technique is the double-deck electroplating technology of the piston rod of scrapping being implemented the iron chromatize, makes the surface of scrapping piston rod form double-deck electrolytic coating, one deck plating iron layer, and one deck plating Chrome layer, concrete steps comprise:
A, plating pre-treatment:
A. the piston rod of scrapping is carried out turning, polishing processing;
B. remove greasy dirt, the rust of the piston rod surface of scrapping;
B, plating iron
A. adopt the symmetric alternating current activation method that the piston rod of scrapping is carried out etching processing, the piston rod that to scrap is put into 35～45 ℃, the solution of ferrous chloride of pH value 0.6～0.9, relative concentration 1.21～1.23, utilize the symmetric alternating current surge, the surface to be plated of the piston rod that activation is scrapped, after treating that surface metal gloss obviously weakens, apply a rush current, make forward current density greater than negative current density, progressively regulate forward or negative current density then, make it last excessively to direct current electrode position, the plating iron layer thickness is 1～5 mm;
B. the piston rod water that takes out after the plating iron cleans, and puts it in 5%～10% the alkaline solution to soak 20min～30min, and then washes oven dry with water;
C, chromium plating
A. with grinding machine cylindrical grinding on the piston rod after the plating iron, reach tolerance of dimension f7, surface roughness Ra 0.4～0.2 μ m carries out hard chrome plating;
B. adopt efficient chromium plating liquid chromium plating, use high current density at 70A/dm
2Following chromium plating, the microhardness of the high HEFF-25 of hardness of chromium coating is HV900～1000, chromium coating thickness is 0.03～0.05 mm.
2. the renovation technique of scrapping piston rod according to claim 1 is characterized in that, described plating is less than 70A/dm in current density
2Environment under carry out.
3. the renovation technique of scrapping piston rod according to claim 1 is characterized in that, the technological specification of described solution of ferrous chloride: iron protochloride-350～400gL
-1, sodium-chlor-10～20gL
-1, manganous chloride-1～5gL
-1, boric acid-5～8gL
-1, pH value: 1～2, temperature: 30～55 ℃, anodic current density/Adm
-2: 15～30.
4. the renovation technique of scrapping piston rod according to claim 1 is characterized in that, the metallic impurity in the described efficient chromium plating bath are less than 7.5g/L, and fluorochemical is smaller or equal to 0.2g/L, and chlorion is smaller or equal to 100mg/L.
5. the renovation technique of scrapping piston rod according to claim 4 is characterized in that, described efficient chromium plating liquid is to be added with one or more organic additives and the auxilliary chromium plating bath that adds a spot of mineral compound.
6. the renovation technique of scrapping piston rod according to claim 5 is characterized in that, described organic additive is CF-201 or CB-B additive, and mineral compound is chromic trioxide or sulfuric acid.
7. the renovation technique of scrapping piston rod according to claim 1 is characterized in that, described chromium coating has 400/cm crackle bar.
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|---|---|---|---|
| CN2013102270956A CN103255454A (en) | 2013-06-08 | 2013-06-08 | Repair process of scrapped piston rods |
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|---|---|---|---|
| CN2013102270956A CN103255454A (en) | 2013-06-08 | 2013-06-08 | Repair process of scrapped piston rods |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898576A (en) * | 2014-01-03 | 2014-07-02 | 淮北市宏跃液压维修有限公司 | Blind hold repairing process of hydraulic oil cylinder |
| CN106661749A (en) * | 2014-07-11 | 2017-05-10 | 萨夫罗克有限公司 | A chromium-containing coating, a method for its production and a coated object |
| CN106826091A (en) * | 2017-01-22 | 2017-06-13 | 西安必盛激光科技有限公司 | A kind of waste and old hydraulic vertical prop restorative procedure |
| CN106925862A (en) * | 2017-03-22 | 2017-07-07 | 朔州金华实业有限公司 | CO is carried out to hydraulic support column piston rod2The method that arc surfacing is repaired |
| CN109664066A (en) * | 2019-01-29 | 2019-04-23 | 中国建筑第二工程局有限公司 | Repairing method for hydraulic jacking oil cylinder of swing arm tower crane |
| US10443143B2 (en) | 2014-01-15 | 2019-10-15 | Savroc Ltd | Method for producing a chromium coating and a coated object |
| US10443142B2 (en) | 2014-01-15 | 2019-10-15 | Savroc Ltd | Method for producing chromium-containing multilayer coating and a coated object |
| CN111571116A (en) * | 2020-07-03 | 2020-08-25 | 杭州拉段机械科技有限公司 | Equipment capable of automatically repairing surface of hydraulic cylinder piston rod with strain |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898576A (en) * | 2014-01-03 | 2014-07-02 | 淮北市宏跃液压维修有限公司 | Blind hold repairing process of hydraulic oil cylinder |
| US10443143B2 (en) | 2014-01-15 | 2019-10-15 | Savroc Ltd | Method for producing a chromium coating and a coated object |
| US10443142B2 (en) | 2014-01-15 | 2019-10-15 | Savroc Ltd | Method for producing chromium-containing multilayer coating and a coated object |
| CN106661749A (en) * | 2014-07-11 | 2017-05-10 | 萨夫罗克有限公司 | A chromium-containing coating, a method for its production and a coated object |
| US10487412B2 (en) | 2014-07-11 | 2019-11-26 | Savroc Ltd | Chromium-containing coating, a method for its production and a coated object |
| CN106826091A (en) * | 2017-01-22 | 2017-06-13 | 西安必盛激光科技有限公司 | A kind of waste and old hydraulic vertical prop restorative procedure |
| CN106925862A (en) * | 2017-03-22 | 2017-07-07 | 朔州金华实业有限公司 | CO is carried out to hydraulic support column piston rod2The method that arc surfacing is repaired |
| CN109664066A (en) * | 2019-01-29 | 2019-04-23 | 中国建筑第二工程局有限公司 | Repairing method for hydraulic jacking oil cylinder of swing arm tower crane |
| CN111571116A (en) * | 2020-07-03 | 2020-08-25 | 杭州拉段机械科技有限公司 | Equipment capable of automatically repairing surface of hydraulic cylinder piston rod with strain |
| CN111571116B (en) * | 2020-07-03 | 2020-11-20 | 杭州拉段机械科技有限公司 | Equipment capable of automatically repairing surface of hydraulic cylinder piston rod with strain |
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Application publication date: 20130821 |