CN110255367B - Lifting sling and production and processing method thereof - Google Patents
Lifting sling and production and processing method thereof Download PDFInfo
- Publication number
- CN110255367B CN110255367B CN201910629067.4A CN201910629067A CN110255367B CN 110255367 B CN110255367 B CN 110255367B CN 201910629067 A CN201910629067 A CN 201910629067A CN 110255367 B CN110255367 B CN 110255367B
- Authority
- CN
- China
- Prior art keywords
- lifting
- welding
- forging
- groove
- positioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000003672 processing method Methods 0.000 title claims abstract description 12
- 238000005242 forging Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims description 52
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000010891 electric arc Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 238000005204 segregation Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 14
- 238000010276 construction Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The lifting sling comprises a baffle plate and a lifting part, and is characterized in that the lifting part is of an oval structure and is convenient to put into a semicircular pin groove, a lifting through hole is formed in the middle of the lifting part and used for installing a lifting hook, a lifting groove is formed in the lower part of the lifting part and used for assembling a pin head, and an assembling port is formed in one side of the lifting part; the pin heads enter the hoisting groove through the assembly port, the hoisting part is locked by rotating a certain angle through the baffle plate, the installation is convenient, the hoisting tool can rotate in the hoisting process, the stress concentration is small, the locking is automatic, the unhooking is avoided, and the safety is higher; the product quality obtained by the split forging production and processing method is better, and the performance and the service life of the lifting sling are improved.
Description
Technical Field
The invention relates to the field of hanging and lifting, in particular to a lifting sling and a production and processing method thereof.
Background
Along with the development of construction technology, the hoisting mode of the concrete prefabricated member in the construction industry is changed, as shown in fig. 5, the round head pin is embedded in the concrete prefabricated member in advance, the round head pin is integrally embedded in the concrete prefabricated member, a semicircular pin groove is formed in the corresponding position of the concrete prefabricated member, the head of the round head pin can be exposed, an assembly space is reserved for hoisting, the hoisting tool in the prior art is a hemispherical locking device, the head of the round head pin is clamped, and the round head pin is fixed by bolts. The lifting appliance is inconvenient to install and uninstall, the bolt fixing safety is low, and the construction efficiency and the construction safety are affected.
Disclosure of Invention
In order to solve the problems, the invention provides a lifting sling and a production and processing method thereof, and provides a lifting sling convenient to assemble and disassemble and a production and processing method thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a promote hoist, includes separation blade and hoist and mount portion, hoist and mount portion sets up to oval structure, is convenient for put into semicircular pin groove, and the middle part of hoist and mount portion is provided with the hoist and mount through-hole for install the lifting hook, the lower part of hoist and mount portion is provided with the hoist and mount groove for the assembly pin head, one side of hoist and mount portion sets up the assembly mouth.
Further, the baffle and the hoisting part are arranged into an integrated structure, and the baffle is arranged at the opposite side of the assembly port.
Further, the lifting through holes are arranged in an oval structure.
Further, the hoisting groove is arranged to be of an arc-shaped structure.
Further, the lower part of the hoisting groove is provided with an arc-shaped opening.
The lifting sling is complex in structure, adopts a casting mode to manufacture a corresponding mould, then performs casting molding, cools and then takes out, and then performs finish machining to remove surface defects. However, due to the drawbacks of the casting process itself, the lifting sling has the following drawbacks:
1. The casting shrinkage cavity exists, the surface of the casting is rough and not smooth, the later finish machining difficulty is high, and the casting is cracked, spherical protrusions and casting burrs, which influence the cooperation with the terminal fittings;
2. the casting has poor mechanical property and poor anti-damage capability, and is easy to be brittle broken in the use process;
3. the casting has low fatigue resistance, is easy to generate fatigue cracks when frequently used, and has potential safety hazards;
4. due to the defects of the casting surface, the defects of foaming, flowering and acid attack are easy to occur after electroplating.
In view of the above problems, the inventors have devised to replace casting by forging. Forging is a processing method for applying pressure to a metal blank by using forging machinery to plastically deform the metal blank to obtain a forging with certain mechanical properties, a certain shape and a certain size, and one of two components of forging (forging and stamping). The defects of cast loosening and the like generated in the smelting process of metal can be eliminated through forging, the microstructure is optimized, and meanwhile, the mechanical properties of the forging are generally superior to those of the casting made of the same material due to the fact that a complete metal streamline is preserved.
However, due to the complex structure of the lifting sling, the internal groove exists in the closed structure, the integral forging is obviously difficult to realize, the inventor performs multiple experiments and exploration to divide the lifting sling into two symmetrical parts along the symmetrical reference plane of the lifting sling, respectively forges the two symmetrical parts, and finally welds the two parts together, and the production and processing method of the lifting sling is provided, and comprises the following steps:
(1) Forging, namely respectively forging a split structure of the lifting sling according to a drawing design; the forging process adopts an intermediate frequency induction furnace for heating, the heating temperature range is controlled to be 1050-1150 ℃, the real-time temperature of the blank is measured by an infrared temperature measuring monitor, the blank in the temperature range of 1050-1150 ℃ is subjected to the next forging, the forging adopts a 2T die forging hammer for forging, the striking force of the blank is 40kJ, the striking speed is 3-4m/s, and the upper die cavity and the lower die cavity are cooled and lubricated by adopting graphite emulsion in the forging process.
(2) Processing a positioning structure, and adding a spherical positioning nest on a positioning matching surface of the split structure;
(3) Processing a welding groove, and processing the welding groove around the positioning matching surface;
(4) Assembling, namely assembling two split structures together through a spherical positioning nest, tightly attaching positioning matching surfaces of the split structures together, and assembling welding grooves of the positioning matching surfaces to form a welding groove;
(5) Welding, namely welding by adopting an argon arc welding WSM 400 type welding machine and adopting a low-alloy welding wire with the model of ER50-6 and the diameter of 1.2-1.6 mm; before welding, the butt welding machine is set as follows: firstly, regulating the pre-gas supply time to 6S, the argon gas flow speed to 10-15L/min, setting the arcing current to 100A, the slow-rise time to 5S, regulating the arcing current to 80A, and the constant current to 140A; to prevent sticking, the thrust current is increased to 100A; in order to ensure the stability of the electric arc, control the shape of a molten pool and control the input capacity, the peak value of the welding pulse current is adjusted to 160A, the pulse frequency is adjusted to 6-10 Hz, the stability of the electric arc is improved by keeping the firmness of the electric arc when the pulse is in high current, the high current is mixed with the low current, and the shape of the molten pool and the input heat are controlled; setting the arc-receiving current as 60A, and setting the gas-delay conveying time to 10S after welding; welding the split structures together along the welding groove;
(6) After welding, the whole normalizing treatment is carried out, the normalizing temperature is between 850 and 950 ℃, the normalizing time is set to be 1.5 to 2.5min/mm, and the internal stress and segregation phenomena generated by a welded junction structure are eliminated.
Further, the welding groove is provided as a V-groove.
Further, the number of spherical positioning sockets was set to 3.
The casting production mode of the lifting sling is changed into a split forging and integral welding mode, and the method has the following advantages:
1. the continuity and the integrity of a metal streamline structure are ensured by the product produced by the forging process;
2. Compacting segregation, loosening, air holes and slag inclusion defects in the raw materials;
3. the newly added V-shaped welding groove design ensures that welding materials are more fully filled, and the newly added spherical positioning nest design ensures that forgings are more tightly matched, so that the dislocation in the assembly and use processes is effectively avoided;
4. normalizing eliminates internal stress and segregation phenomena, improves heat treatment hardenability, remarkably improves anti-damage capability and enhances mechanical properties;
5. the fatigue strength is obviously improved, and no crack exists in the standard range;
6. The surface quality is obviously improved, the defects of air holes, cracks and the like generated by casting can not occur, and the electroplating is more attractive and the corrosion resistance is better.
Compared with the prior art, the invention has the following beneficial effects: the pin heads enter the hoisting groove through the assembly port, the hoisting part is locked by rotating a certain angle through the baffle plate, the installation is convenient, the hoisting tool can rotate in the hoisting process, the stress concentration is small, the locking is automatic, the unhooking is avoided, and the safety is higher; the product quality obtained by the split forging production and processing method is better, and the performance and the service life of the lifting sling are improved.
Drawings
The present invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the construction of a lifting sling;
FIG. 2 is a schematic cross-sectional view of a lifting sling;
FIG. 3 is a schematic view of a split construction of a forged lift spreader;
FIG. 4 is a schematic view of another split construction of the forged lift spreader;
FIG. 5 is a schematic view of the structure of a round head pin in a concrete preform;
FIG. 6 is a schematic structural diagram of a hoisting process;
In the accompanying drawings: 1. baffle 2, lifting part, 3, lifting through hole, 4, lifting groove, 5, assembly mouth, 6, arc opening, 7, location arch, 8, location nest, 9, groove.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described with reference to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 6 and specific embodiments.
As shown in fig. 1 and fig. 2, a lifting sling comprises a baffle plate 1 and a lifting part 2, wherein the lifting part 2 is of an oval structure and is convenient to put into a semicircular pin groove, a lifting through hole 3 is formed in the middle of the lifting part 2 and used for installing a lifting hook, a lifting groove 4 is formed in the lower portion of the lifting part 2 and used for assembling a pin head, and an assembling port 5 is formed in one side of the lifting part 2.
Further, the baffle plate 1 and the hoisting part 2 are arranged as an integrated structure, and the baffle plate 1 is arranged at the opposite side of the assembly opening 5.
Further, the hoist through hole 3 is provided in an elliptical structure.
Further, the hanging groove 4 is provided in an arc-shaped structure.
Further, the lower part of the lifting groove 4 is provided with an arc-shaped opening 6.
The production and processing method of the lifting sling comprises the following steps:
(1) Forging, namely respectively forging a split structure of the lifting sling according to a drawing design; the forging process adopts an intermediate frequency induction furnace for heating, the heating temperature range is controlled to be 1050-1150 ℃, an infrared temperature measuring monitor is used for measuring the real-time temperature of the blank, the blank in the temperature range of 1050-1150 ℃ is subjected to the next forging, the forging is performed by adopting a 2T die forging hammer, the striking force of the blank is 40kJ, the striking speed is 3-4m/s, the upper die cavity and the lower die cavity are cooled and lubricated by adopting graphite emulsion in the forging process, and 3 spherical positioning protrusions 7 are arranged on a positioning matching surface 10 of one split structure;
(2) Processing a positioning structure, as shown in fig. 3 and fig. 4, adding 3 spherical positioning sockets 8 on a positioning matching surface 10 of another split structure;
(3) Processing a welding groove, as shown in fig. 3 and fig. 4, processing a welding groove 9 around the positioning matching surface 10;
(4) The two split structures are assembled together through the spherical positioning nest 8 and the positioning bulge 7, the positioning matching surfaces 10 of the split structures are tightly attached together, and the welding grooves 9 of the positioning matching surfaces 10 are assembled to form V-shaped welding grooves;
(5) Welding, namely welding by adopting an argon arc welding WSM 400 type welding machine and adopting a low-alloy welding wire with the model of ER50-6 and the diameter of 1.2-1.6 mm; before welding, the butt welding machine is set as follows: firstly, regulating the pre-gas supply time to 6S, the argon gas flow speed to 10-15L/min, setting the arcing current to 100A, the slow-rise time to 5S, regulating the arcing current to 80A, and the constant current to 140A; to prevent sticking, the thrust current is increased to 100A; in order to ensure the stability of the electric arc, control the shape of a molten pool and control the input capacity, the peak value of the welding pulse current is adjusted to 160A, the pulse frequency is adjusted to 6-10 Hz, the stability of the electric arc is improved by keeping the firmness of the electric arc when the pulse is in high current, the high current is mixed with the low current, and the shape of the molten pool and the input heat are controlled; setting the arc-receiving current as 60A, and setting the gas-delay conveying time to 10S after welding; welding the split structures together along the welding groove;
(6) After welding, the whole normalizing treatment is carried out, the normalizing temperature is between 850 and 950 ℃, the normalizing time is set to be 1.5 to 2.5min/mm, and the internal stress and segregation phenomena generated by a welded junction structure are eliminated.
The working principle and the working process of the invention are as follows: when the lifting device is used, as shown in figure 6, the assembly port 5 is aligned with the pin head, the pin column passes through the arc-shaped opening 6, the pin head enters the lifting groove 4, the lifting part 2 is locked by rotating a certain angle through the baffle plate 1, then the lifting hook is arranged in the lifting through hole 3, the lifting operation can be carried out, and the pin head can rotate in the lifting groove 4; during unloading, the lifting part 2 is rotated by a certain angle through the baffle plate 1, and the lifting part 2 is taken out along the bending direction of the lifting groove 4, so that the lifting device is convenient and quick.
Compared with the prior art, the invention has the following beneficial effects: the pin heads enter the hoisting groove through the assembly port, the hoisting part is locked by rotating a certain angle through the baffle plate, the installation is convenient, the hoisting tool can rotate in the hoisting process, the stress concentration is small, the locking is automatic, the unhooking is avoided, and the safety is higher; the product quality obtained by the split forging production and processing method is better, and the performance and the service life of the lifting sling are improved.
By using the technical scheme of the invention or under the inspired by the technical scheme of the invention, a similar technical scheme is designed by a person skilled in the art, so that the technical effects are achieved, and the technical effects fall into the protection scope of the invention.
Claims (5)
1. The lifting sling comprises a baffle plate (1) and a lifting part (2), and is characterized in that the lifting part (2) is of an oval structure, a lifting through hole (3) is formed in the middle of the lifting part (2), a lifting groove (4) is formed in the lower portion of the lifting part (2), and an assembly port (5) is formed in one side of the lifting part (2);
The production and processing method for manufacturing the lifting sling comprises the following steps:
1) Forging, namely respectively forging a split structure of the lifting sling according to a drawing design; the forging process adopts an intermediate frequency induction furnace for heating, the heating temperature range is controlled to be 1050-1150 ℃, an infrared temperature measuring monitor is used for measuring the real-time temperature of a blank, the blank in the temperature range of 1050-1150 ℃ is subjected to the next forging, the forging is performed by adopting a 2T die forging hammer, the striking force of the blank is 40kJ, the striking speed is 3-4m/s, the upper die cavity and the lower die cavity are cooled and lubricated by adopting graphite emulsion in the forging process, and 3 spherical positioning protrusions (7) are arranged on a positioning matching surface (10) of one split structure;
2) Processing a positioning structure, and adding 3 spherical positioning sockets (8) on a positioning matching surface (10) of the other split structure;
3) A welding groove is processed, and a welding groove (9) is processed around the positioning matching surface (10);
4) The two split structures are assembled together through a spherical positioning nest (8) and a positioning bulge (7), positioning matching surfaces (10) of the split structures are tightly attached together, and welding grooves (9) of the positioning matching surfaces (10) are assembled into V-shaped welding grooves;
5) Welding, namely welding by adopting an argon arc welding WSM 400 type welding machine and adopting a low-alloy welding wire with the model of ER50-6 and the diameter of 1.2-1.6 mm; before welding, the butt welding machine is set as follows: firstly, regulating the pre-gas supply time to 6S, the argon gas flow speed to 10-15L/min, setting the arcing current to 100A, the slow-rise time to 5S, regulating the arcing current to 80A, and the constant current to 140A; to prevent sticking, the thrust current is increased to 100A; in order to ensure the stability of the electric arc, control the shape of a molten pool and control the input capacity, the peak value of the welding pulse current is adjusted to 160A, the pulse frequency is adjusted to 6-10 Hz, the stability of the electric arc is improved by keeping the firmness of the electric arc when the pulse is in high current, the high current is mixed with the low current, and the shape of the molten pool and the input heat are controlled; setting the arc-receiving current as 60A, and setting the gas-delay conveying time to 10S after welding; welding the split structures together along the welding groove;
6) After welding, the whole normalizing treatment is carried out, the normalizing temperature is between 850 and 950 ℃, the normalizing time is set to be 1.5 to 2.5min/mm, and the internal stress and segregation phenomena generated by a welded junction structure are eliminated.
2. The lifting sling as defined in claim 1, wherein the baffle (1) and the lifting part (2) are arranged as an integral structure, and the baffle (1) is arranged at the opposite side of the assembly opening (5).
3. A lifting sling as claimed in claim 1, characterised in that the lifting eye (3) is provided with an oval configuration.
4. A lifting appliance according to claim 1, characterized in that the lifting groove (4) is arranged in an arc-shaped configuration.
5. A lifting sling as claimed in claim 1, characterised in that the lower part of the lifting trough (4) is provided with an arc-shaped opening (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910629067.4A CN110255367B (en) | 2019-07-12 | 2019-07-12 | Lifting sling and production and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910629067.4A CN110255367B (en) | 2019-07-12 | 2019-07-12 | Lifting sling and production and processing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110255367A CN110255367A (en) | 2019-09-20 |
| CN110255367B true CN110255367B (en) | 2024-05-31 |
Family
ID=67925876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910629067.4A Active CN110255367B (en) | 2019-07-12 | 2019-07-12 | Lifting sling and production and processing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110255367B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115390538B (en) * | 2022-10-26 | 2023-01-17 | 山东神力索具有限公司 | Intelligent rigging manufacturing control method based on model optimization |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1518399A (en) * | 1966-04-12 | 1968-03-22 | Mitsubishi Heavy Ind Ltd | Welded joint for tanks and other containers |
| SU1563920A1 (en) * | 1988-04-26 | 1990-05-15 | Всесоюзный Научно-Исследовательский Институт Железнодорожного Транспорта | Method of resistance butt welding of rails |
| JPH10218553A (en) * | 1997-02-12 | 1998-08-18 | Hitachi Metals Ltd | Hoisting accessory |
| JP3165981U (en) * | 2010-12-02 | 2011-02-10 | 國基 林 | Multi-function hanger |
| CN210193190U (en) * | 2019-07-12 | 2020-03-27 | 山东神力索具有限公司 | Lifting sling |
-
2019
- 2019-07-12 CN CN201910629067.4A patent/CN110255367B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1518399A (en) * | 1966-04-12 | 1968-03-22 | Mitsubishi Heavy Ind Ltd | Welded joint for tanks and other containers |
| SU1563920A1 (en) * | 1988-04-26 | 1990-05-15 | Всесоюзный Научно-Исследовательский Институт Железнодорожного Транспорта | Method of resistance butt welding of rails |
| JPH10218553A (en) * | 1997-02-12 | 1998-08-18 | Hitachi Metals Ltd | Hoisting accessory |
| JP3165981U (en) * | 2010-12-02 | 2011-02-10 | 國基 林 | Multi-function hanger |
| CN210193190U (en) * | 2019-07-12 | 2020-03-27 | 山东神力索具有限公司 | Lifting sling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110255367A (en) | 2019-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110255367B (en) | Lifting sling and production and processing method thereof | |
| CN109434390B (en) | Processing method of large forging lifting hook | |
| CN105798560A (en) | Integral forging technique for blind hole flange type cardan joint | |
| CN101648333B (en) | Manufacturing method of large-tonnage combined lifting hook | |
| CN207209744U (en) | A kind of quenching hook frock for the heat treatment lifting of single flange main shaft | |
| CN104451100B (en) | A kind of seamless steel pipe heat treatment method | |
| CN112935205A (en) | 7xxx series aluminum alloy large-size hollow ingot production device and process thereof | |
| CN210884876U (en) | Hoisting tool for marine low-speed diesel engine cylinder liner | |
| CN104324972B (en) | A kind of production method of heavy caliber superhigh intensity steel seamless steel tube | |
| CN201304465Y (en) | Large-scale wind-powered chief axis end big flange continuous upsetting molding mould | |
| CN106755890A (en) | A kind of frock for solid rocket motor case heat treatment | |
| CN219950245U (en) | Semi-automatic hoisting tool for flange-free low-pressure casting top die | |
| CN110033907A (en) | A kind of spherical manufacturing method with channel-section steel cap of suspension insulator | |
| CN220702979U (en) | Multifunctional lifting appliance assembly | |
| CN104690199A (en) | Free forging method for blowout preventer body used for petroleum drilling and production | |
| CN214684177U (en) | Split type arc bottom ingot mould | |
| CN220596769U (en) | Hoisting tool for large-tonnage long shaft | |
| CN202321993U (en) | Device for interference hot-assembly and hoisting of ladle and hot-metal ladle trunnion | |
| CN212388088U (en) | Novel monopole electroslag furnace | |
| CN216945847U (en) | Special lifting appliance for electroslag false electrode | |
| CN211261746U (en) | High-plasticity high-speed steel preparation device | |
| CN216638621U (en) | Kaldo furnace hoist | |
| CN219907751U (en) | Centering and connecting device for furnace bottom and furnace body of movable furnace bottom converter | |
| CN218613527U (en) | Workpiece hanging tool for shot blasting machine | |
| CN215626196U (en) | Sling of auxiliary electrode for vacuum consumable electrode furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |