CN113399467A - Vertical roller universal shaft safety device and use method - Google Patents
Vertical roller universal shaft safety device and use method Download PDFInfo
- Publication number
- CN113399467A CN113399467A CN202110683398.3A CN202110683398A CN113399467A CN 113399467 A CN113399467 A CN 113399467A CN 202110683398 A CN202110683398 A CN 202110683398A CN 113399467 A CN113399467 A CN 113399467A
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- Prior art keywords
- bracket
- electric cylinder
- telescopic rod
- universal shaft
- cylinder telescopic
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/14—Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills
- B21B35/142—Yielding spindle couplings; Universal joints for spindles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention provides a safety device for a universal shaft of a vertical roller and a using method thereof.
Description
Technical Field
The application relates to the technical field of safety devices of metallurgical equipment, in particular to a safety device for a vertical roller universal shaft and a using method of the safety device.
Background
On a rod and wire processing production line, a vertical rolling mill is a common device. In order to ensure the quality and the rolling efficiency of rolled pieces, when the roller is damaged, the roller needs to be replaced. The transmission of vertical roll is mainly connected by the cardan shaft for transmission, and the roll and the cardan shaft need to be separated in the process of replacing the roll, and the cardan shaft needs to be supported by a hydraulic bracket to prevent falling. There are also prior art designs that prevent dropping by having the safety catch plate catch the carriage.
However, in the long-term use, the traditional universal shaft bracket of the vertical rolling mill is discovered, in the shutdown roll changing process, because the hydraulic system leaks, the pressure of the hydraulic cylinder is insufficient, the hydraulic cylinder is decompressed in the operation process to cause the bracket to be unfolded, the universal shaft is caused to fall, and the safety accident is caused. The safety clamping plate is difficult to buckle the bracket in the pressure loss process due to low radian and size precision. And because the vertical rolling mill is higher, when installing the safety card board, need carry out the operation of climbing, make the operating personnel be in danger situation.
Therefore, the use of the universal shaft bracket of the traditional vertical rolling mill faces a plurality of risks, the smooth production is influenced, equipment accidents can occur, and meanwhile, the harm to operators can be caused.
Disclosure of Invention
The embodiment of the application aims to provide a vertical roller cardan shaft safety device and a using method, wherein the cardan shaft bracket is mechanically locked in an interlocking mode of an electric cylinder, a proximity switch, an electric mortise lock and other components, so that the operation safety is ensured.
In a first aspect, the embodiment of the application provides a vertical roller cardan shaft safety device, which comprises a vertical roller, a cardan shaft and a bracket system, wherein the vertical roller is connected and driven through the cardan shaft; the bracket system comprises a bracket and a hydraulic cylinder, the bracket comprises a first bracket and a second bracket which are symmetrically arranged on two sides of the cardan shaft, and the first bracket and the second bracket can drive the cardan shaft to jointly lift through the hydraulic cylinder; an electric cylinder telescopic rod is arranged on the first bracket, an annular lock hole is formed in the top end of the electric cylinder telescopic rod, an opening is formed in the second bracket, and an electric mortise lock is arranged at the position of the opening; when the roller is replaced, the vertical roller is separated from the universal shaft, the first bracket and the second bracket support the universal shaft, the electric cylinder telescopic rod can be aligned to the opening and extend, when the annular lock hole in the top end of the electric cylinder telescopic rod reaches the opening position, the electric cylinder telescopic rod stops advancing, and meanwhile, the lock cylinder of the electric mortise lock is inserted into the annular lock hole in the top end of the electric cylinder telescopic rod, so that mechanical locking is achieved.
In the implementation process, the first bracket and the second bracket are symmetrically arranged on two sides of the universal shaft, the hydraulic cylinder drives the first bracket and the second bracket to move simultaneously, and in the process of supporting the universal shaft, the bracket is symmetrically arranged, so that the supporting process can be stably carried out, and deviation does not occur.
In the implementation process, the extending direction of the telescopic rod of the electric cylinder is perpendicular to the inserting direction of the lock cylinder of the electric mortise lock. Therefore, the condition that the lock cylinder of the electric mortise lock cannot be inserted into the annular lock hole due to the angle when the annular lock hole reaches the position of the opening hole is avoided.
And the hole opening part of the second bracket is provided with a proximity switch, and when the annular lock hole at the top end of the electric cylinder telescopic rod reaches the hole opening position, the proximity switch controls the electric cylinder to be powered off to enable the electric cylinder telescopic rod to stop extending.
In the implementation process, after the electric cylinder is started, the electric cylinder telescopic rod extends towards the hole opening position, when the annular lock hole at the end part of the electric cylinder telescopic rod is located in the induction area of the proximity switch, according to actual setting, the proximity switch can control the electric cylinder to be powered off as required, and then the electric cylinder telescopic rod stops extending.
The universal shaft is characterized in that a surrounding clamping groove is formed in the lower portion of the universal shaft, L-shaped supporting hooks are arranged at the end portions of the first bracket and the second bracket, and the supporting hooks hook the clamping groove to support the universal shaft.
The bracket system also comprises an arc-shaped safety catch plate which is used for catching the back parts of the supporting hooks at the end parts of the first bracket and the second bracket.
In the above-mentioned realization process, set up safe cardboard, avoid the unhook to become flexible or unhook hooking the in-process that the draw-in groove held up the cardan shaft, realize dual fail-safe.
The radian of the safety clamping plate is matched with the circumference of the section of the universal shaft.
In the above-mentioned realization process, in order to make safety card board and cardan shaft laminating inseparable, avoid sliding or not hard up, need with the radian design of safety card board with the circumference looks adaptation of cardan shaft cross-section.
The proximity switch selects one of an inductive type, a capacitive type, a Hall type and an AC/DC type.
The first bracket and the second bracket are respectively provided with a hydraulic cylinder, and the hydraulic cylinders of the first bracket and the second bracket are driven by the PLC to move simultaneously.
In the implementation process, the hydraulic cylinders are synchronously driven through the PLC, the universal shafts are supported by the first bracket and the second bracket through force, and potential safety hazards caused by inclination or deviation are avoided.
In a second aspect, the embodiment of the present application provides a method for using a vertical roller cardan shaft safety device, where the method employs the above safety device, and includes the following steps:
step S1: after a roller replacing process is prepared, the vertical roller is controlled to be separated from the universal shaft, a PLC (programmable logic controller) controls a hydraulic cylinder to drive a first bracket and a second bracket to move simultaneously, and L-shaped support hooks at the end parts of the first bracket and the second bracket hook clamping grooves at the lower part of the universal shaft to support the universal shaft;
step S2: the electric cylinder is started, the electric cylinder telescopic rod on the first bracket is aligned with the opening on the second bracket to extend, when the annular lock hole in the top end of the electric cylinder telescopic rod reaches the opening position, the proximity switch controls the electric cylinder to be powered off to enable the electric cylinder telescopic rod to stop extending, and meanwhile, the lock cylinder of the electric mortise lock is inserted into the annular lock hole in the top end of the electric cylinder telescopic rod to realize mechanical locking.
In a third aspect, the embodiment of the application provides an application of the method in the shutdown roll change of the vertical rolling mill.
Has the advantages that:
in the implementation process, the invention provides a safety device for a vertical roller cardan shaft and a use method thereof, wherein the cardan shaft bracket is mechanically locked in a linkage mode of components such as an electric cylinder, a proximity switch, an electric mortise lock and the like, so that the operation safety is ensured.
Compared with the prior art, the method has the following beneficial effects:
1. after the universal shaft is supported by the bracket, the universal shaft bracket is safely locked and protected by adopting an interlocking mode of components such as an electric cylinder, a proximity switch, an electric mortise lock and the like, so that potential safety hazards caused by oil leakage and pressure loss of the hydraulic cylinder are avoided, and the safety of operators in operation is ensured.
2. The process of installing the safety clamping plate by manually climbing in the traditional technology is omitted through an electric control mode, manpower is saved, and the danger of high-altitude operation is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a vertical roll cardan shaft safety device provided in an embodiment of the present application.
Wherein, each reference mark is 1-vertical roller; 2-a cardan shaft; 3-a first bracket; 4-a second carrier; 5-an electric cylinder; 6-electric cylinder telescopic rod; 7-annular lockhole; 8-a proximity switch; 9-a card slot; 10-safety card.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Examples
Referring to fig. 1, the embodiment provides a vertical roller cardan shaft safety device, which comprises a vertical roller 1, a cardan shaft 2 and a bracket system, wherein the vertical roller 1 is in transmission connection through the cardan shaft 2; the bracket system comprises a bracket and a hydraulic cylinder, the bracket comprises a first bracket 3 and a second bracket 4 which are symmetrically arranged at two sides of the cardan shaft, and the first bracket 3 and the second bracket 4 can drive the cardan shaft 2 to be supported together through the hydraulic cylinder; the first bracket is provided with an electric cylinder 5 and an electric cylinder telescopic rod 6, the top end of the electric cylinder telescopic rod 6 is provided with an annular lock hole 7, the second bracket is provided with an opening (not shown in the figure), and the opening part is provided with an electric mortise lock; when the roller is replaced, the vertical roller 1 is separated from the universal shaft 2, the first bracket 3 and the second bracket 4 support the universal shaft 2, the electric cylinder telescopic rod 6 can be aligned to the opening and extend, when the annular lock hole 7 at the top end of the electric cylinder telescopic rod 6 reaches the opening position, the electric cylinder telescopic rod 6 stops advancing, and meanwhile, the lock cylinder of the electric mortise lock is inserted into the annular lock hole 7 at the top end of the electric cylinder telescopic rod 6, so that mechanical locking is realized.
In the implementation process, the first bracket 3 and the second bracket 4 are symmetrically arranged on two sides of the universal shaft 2, the hydraulic cylinder drives the first bracket 3 and the second bracket 4 to move simultaneously, and in the process of supporting the universal shaft 2, the brackets are symmetrically arranged, so that the supporting process can be stably carried out, and deviation does not occur.
In the implementation process, the extending direction of the electric cylinder telescopic rod 6 is perpendicular to the inserting direction of the electric mortise lock core. Therefore, the condition that the lock cylinder of the electric mortise lock cannot be inserted into the annular lock hole due to the angle when the annular lock hole 7 reaches the opening position is avoided.
The hole opening part of the second bracket is provided with a proximity switch 8, and when the annular lock hole 7 at the top end of the electric cylinder telescopic rod 6 reaches the hole opening position, the proximity switch 8 controls the electric cylinder 5 to be powered off to enable the electric cylinder telescopic rod 6 to stop extending.
In the implementation process, after the electric cylinder 5 is started, the electric cylinder telescopic rod 6 extends towards the hole opening position, when the annular lock hole 7 at the end part of the electric cylinder telescopic rod 6 is located in the sensing area of the proximity switch 8, according to actual setting, the proximity switch 8 controls the electric cylinder 5 to be powered off as required, and then the electric cylinder telescopic rod 6 stops extending.
The lower portion of the universal shaft 2 is provided with a surrounding clamping groove 9, the end portions of the first bracket 3 and the second bracket 4 are provided with L-shaped supporting hooks, and the supporting hooks hook the clamping groove 9 to support the universal shaft 2.
The carriage system further comprises an arcuate safety catch 10 (shown in phantom) for catching the back of the catch at the end of the first and second carriages 3, 4.
In the implementation process, the safety clamping plate 10 is arranged, so that the phenomenon that the supporting hook is loosened or falls off in the process of hooking the clamping groove to support the universal shaft is avoided, and double insurance is achieved.
The radian of the safety clamping plate is matched with the circumference of the section of the universal shaft.
In the above-mentioned realization process, in order to make safety card board and cardan shaft laminating inseparable, avoid sliding or not hard up, need with the radian design of safety card board with the circumference looks adaptation of cardan shaft cross-section.
The proximity switch selects one of an inductive type, a capacitive type, a Hall type and an AC/DC type.
The first bracket 3 and the second bracket 4 are respectively provided with a hydraulic cylinder, and the hydraulic cylinders of the first bracket 3 and the second bracket 4 are driven by a PLC to move simultaneously.
In the implementation process, the hydraulic cylinders are synchronously driven through the PLC, the first bracket 3 and the second bracket 4 are guaranteed to simultaneously exert force to support the universal shaft 2, and potential safety hazards caused by inclination or deviation are avoided.
The use method of the vertical roller universal shaft safety device is used for safety guarantee in shutdown roll change of a vertical rolling mill, wherein the method adopts the vertical roller universal shaft safety device and comprises the following steps:
step S1: after a roller replacing process is prepared, the vertical roller 1 is controlled to be separated from the universal shaft 2, the PLC controls a hydraulic cylinder to drive the first bracket 3 and the second bracket 4 to move simultaneously, and L-shaped support hooks at the end parts of the first bracket 3 and the second bracket 4 hook a clamping groove 9 at the lower part of the universal shaft 2 to support the universal shaft 2;
step S2: the electric cylinder 5 is started, the electric cylinder telescopic rod 6 on the first bracket 3 is aligned to the hole in the second bracket 4 to extend, when the annular lock hole 7 in the top end of the electric cylinder telescopic rod 6 reaches the hole opening position, the proximity switch 8 controls the electric cylinder 5 to be powered off to enable the electric cylinder telescopic rod 6 to stop extending, and meanwhile, the lock cylinder of the electric cylinder lock is inserted into the annular lock hole 7 in the top end of the electric cylinder telescopic rod 6 to realize mechanical locking.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A vertical roller cardan shaft safety device comprises a vertical roller, a cardan shaft and a bracket system,
the vertical roller is connected with the universal shaft for transmission;
the bracket system comprises a bracket and a hydraulic cylinder, the bracket comprises a first bracket and a second bracket which are symmetrically arranged on two sides of the cardan shaft, and the first bracket and the second bracket can drive the cardan shaft to jointly lift through the hydraulic cylinder;
an electric cylinder telescopic rod is arranged on the first bracket, an annular lock hole is formed in the top end of the electric cylinder telescopic rod, an opening is formed in the second bracket, and an electric mortise lock is arranged at the position of the opening;
the vertical roller is separated from the universal shaft when the roller is replaced, the first bracket and the second bracket support the universal shaft, the electric cylinder telescopic rod can be aligned with the opening to extend, when the annular lock hole in the top end of the electric cylinder telescopic rod reaches the opening position, the electric cylinder telescopic rod stops advancing, and meanwhile, the lock cylinder of the electric mortise lock is inserted into the annular lock hole in the top end of the electric cylinder telescopic rod, so that mechanical locking is achieved.
2. The safety device according to claim 1, wherein the opening portion of the second bracket is provided with a proximity switch, and when the annular locking hole at the top end of the electric cylinder telescopic rod reaches the opening position, the proximity switch controls the electric cylinder to be powered off to stop the extension of the electric cylinder telescopic rod.
3. The safety device according to claim 1, wherein a surrounding clamping groove is formed in the lower portion of the universal shaft, and L-shaped supporting hooks are arranged at the end portions of the first bracket and the second bracket and hook the clamping groove to support the universal shaft.
4. A security device according to claim 3, wherein the tray system further comprises an arcuate security catch for catching the back of the hook at the end of the first and second trays.
5. A security device according to claim 4, wherein the arc of the security card is adapted to the circumference of the section of the cardan shaft.
6. The safety arrangement according to claim 5, wherein the proximity switch is selected from one of inductive, capacitive, Hall, AC/DC.
7. The safety device according to claim 2, wherein a hydraulic cylinder is provided on each of the first and second brackets, and the hydraulic cylinders of the first and second brackets are driven to move simultaneously by a PLC.
8. A method of using a vertical roll cardan shaft safety device, said method employing the safety device of claim 7, comprising the steps of:
step S1: after a roller replacing process is prepared, the vertical roller is controlled to be separated from the universal shaft, a PLC (programmable logic controller) controls a hydraulic cylinder to drive a first bracket and a second bracket to move simultaneously, and L-shaped support hooks at the end parts of the first bracket and the second bracket hook clamping grooves at the lower part of the universal shaft to support the universal shaft;
step S2: the electric cylinder is started, the electric cylinder telescopic rod on the first bracket is aligned with the opening on the second bracket to extend, when the annular lock hole in the top end of the electric cylinder telescopic rod reaches the opening position, the proximity switch controls the electric cylinder to be powered off to enable the electric cylinder telescopic rod to stop extending, and meanwhile, the lock cylinder of the electric mortise lock is inserted into the annular lock hole in the top end of the electric cylinder telescopic rod to realize mechanical locking.
9. Use of the method according to claim 8 for changing rolls in a vertical rolling mill during standstill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110683398.3A CN113399467B (en) | 2021-06-18 | 2021-06-18 | Safety device for universal shaft of vertical roller and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110683398.3A CN113399467B (en) | 2021-06-18 | 2021-06-18 | Safety device for universal shaft of vertical roller and use method |
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| Publication Number | Publication Date |
|---|---|
| CN113399467A true CN113399467A (en) | 2021-09-17 |
| CN113399467B CN113399467B (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110683398.3A Active CN113399467B (en) | 2021-06-18 | 2021-06-18 | Safety device for universal shaft of vertical roller and use method |
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| CN202715620U (en) * | 2012-06-04 | 2013-02-06 | 福建乾达重型机械有限公司 | Cardan shaft bracket device |
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| CN203484412U (en) * | 2013-07-30 | 2014-03-19 | 宝山钢铁股份有限公司 | Rolling mill transmission shaft supporting device |
| CN203917399U (en) * | 2014-05-16 | 2014-11-05 | 中冶南方工程技术有限公司 | Be applicable to the spindle bracket of play axle |
| CN205362227U (en) * | 2016-01-11 | 2016-07-06 | 邯钢集团邯宝钢铁有限公司 | Rolling mill cardan shaft bracket |
| CN106698191A (en) * | 2015-11-16 | 2017-05-24 | 天津天铁冶金集团有限公司 | Tungsten carbide roller ring hoisting tool |
| CN110745691A (en) * | 2019-11-01 | 2020-02-04 | 中冶宝钢技术服务有限公司 | Method for repairing universal shaft of vertical rolling mill and special tool |
| CN112024608A (en) * | 2020-08-28 | 2020-12-04 | 中钢集团西安重机有限公司 | Shaft head holding device for replacing supporting plate on line and assembling method thereof |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1360714A (en) * | 1961-10-20 | 1964-05-15 | United Eng Foundry Co | Device for changing the rolls of a rolling mill |
| JPH0477585U (en) * | 1990-11-20 | 1992-07-07 | ||
| DE29712552U1 (en) * | 1997-07-16 | 1997-10-02 | Schloemann Siemag Ag | Hanging coupling for lifting devices, in particular for picking up and putting down heat insulation hoods |
| CN102389901A (en) * | 2011-11-02 | 2012-03-28 | 无锡五冶重工机械有限公司 | Cardan shaft bracket hydraulic device of rolling mill |
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| CN103191925A (en) * | 2013-03-28 | 2013-07-10 | 鞍钢股份有限公司 | Bidirectional locking method and mechanism for fixed arm of roll rack |
| CN203484412U (en) * | 2013-07-30 | 2014-03-19 | 宝山钢铁股份有限公司 | Rolling mill transmission shaft supporting device |
| CN203917399U (en) * | 2014-05-16 | 2014-11-05 | 中冶南方工程技术有限公司 | Be applicable to the spindle bracket of play axle |
| CN106698191A (en) * | 2015-11-16 | 2017-05-24 | 天津天铁冶金集团有限公司 | Tungsten carbide roller ring hoisting tool |
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| CN112024608A (en) * | 2020-08-28 | 2020-12-04 | 中钢集团西安重机有限公司 | Shaft head holding device for replacing supporting plate on line and assembling method thereof |
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| CN113399467B (en) | 2023-06-27 |
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