CN106697369A - Radial fastening device of high-strength hot rolled strip steel coil - Google Patents
Radial fastening device of high-strength hot rolled strip steel coil Download PDFInfo
- Publication number
- CN106697369A CN106697369A CN201611139398.2A CN201611139398A CN106697369A CN 106697369 A CN106697369 A CN 106697369A CN 201611139398 A CN201611139398 A CN 201611139398A CN 106697369 A CN106697369 A CN 106697369A
- Authority
- CN
- China
- Prior art keywords
- strip
- strength hot
- coil
- rolled strip
- electric cylinder
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B13/00—Bundling articles
- B65B13/02—Applying and securing binding material around articles or groups of articles, e.g. using strings, wires, strips, bands or tapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/24—Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B13/00—Bundling articles
- B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
- B65B13/20—Means for compressing or compacting bundles prior to bundling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
Abstract
The invention relates to the field of hot rolled strip steel packaging, in particular to a radial fastening device of a high-strength hot rolled strip steel coil. The radial fastening device comprises a radial fastening strip. The radial fastening strip comprises a large horizontal plate, middle connection plates, small horizontal plates and bolt holes. The large horizontal plate, the middle connection plates and the small horizontal plates are formed by cold-bending hot rolled strip steel. The middle connection plates and the small horizontal plates are each symmetrically arranged on the two sides of the large horizontal plate in a bent mode. The multiple bolt holes are formed in the small horizontal plates. Through the design of the radial fastening strip, an auxiliary storage table and an automatic transport mechanism, the degree of automation is increased, efficiency is improved, excessive manual participation is avoided, labor is saved, and the problem of casualties in the operation process is avoided.
Description
Technical field
The present invention relates to hot-strip packaging field, particularly radially fastening is filled a kind of high-strength hot-rolled strip coil of strip
Put.
Background technology
Hot-strip is drawn off to be transported to from coiling machine by coil stripping car and beaten after mill milling, coiling machine coil into coil of strip
Bundle seat, bundling is carried out by baler, and bundling passage is determined according to the width and thickness of strip；To high-strength hot-rolled during online production
Strip coil of strip carries out carrying out complement bundle with steel coil bundling band, causes coil of strip slow in hot rolling producing line step rate chain travelling speed, sternly
The about such production strip production capacity of recasting is limited, while increased the artificial frequency for changing Bundling strap, causes a large amount of Bundling straps
Consumption.But for variety steels such as low-temperature high-strength dual phase steel, steel for automobile crossbeam, pipeline steels, strip yield strength is high, only
Only relying on steel coil bundling band can not effectively fetter coil of strip, easily cause high-strength hot-rolled strip coil of strip in handling entrucking, unload
During cause tie to break, come off, coil of strip loose winding, the problems such as dissipate volume, coil of strip after loose winding to entrucking, handling, unload and after
Continuous processing is used and brings very big potential safety hazard.
The content of the invention
The invention provides a kind of high-strength hot-rolled strip coil of strip radial tightening device, the fastener can be saved preferably
About tie, and coil of strip can effectively be fettered in radial directions, eliminate coil of strip loose winding, dissipate volume problem, greatly improve
The packaging of high-strength hot-rolled coil of strip and transport, processing operating environment.
A kind of high-strength hot-rolled strip coil of strip radial tightening device, including a radial direction bracket, the radial direction bracket bag
Big level board, middle part connecting plate, pinnule and bolt hole are included, the big level board, middle part connecting plate, pinnule are a heat
Kicker shape strip clod wash is processed, and big level board both sides are symmetrically bent with middle part connecting plate and pinnule, small
Level board is provided with multiple bolts hole.
Further, also including an auxiliary mounting table, the auxiliary mounting table includes slide unit, slide rail, sliding block, rotation electricity
Machine, saddle, grip block, non-slipping block and connecting shaft, the slide rail are provided with sliding block, and two slider brackets set up slide unit, two
The gap of the high-strength hot-rolled strip coil of strip of a placement is provided between the slide unit, is provided with slide unit for placing radial direction bracket
Saddle, the grip block of one and cylinders is provided with saddle, be provided with non-slipping block on the grip block, saddle is by connection
Axle is connected with rotary electric machine, and the rotary electric machine is arranged on slide unit.
Further, also including an automatic transporting mechanism, the automatic transporting mechanism includes a mounting bracket, the mounting bracket
Two rollers are provided with, conveyer belt is installed on two rollers, the roller is connected with motor, the end position of conveyer belt transmission
Placement location inhales electric cylinder once, and the resorption electric cylinder is provided with an installing plate, and the installing plate is provided with adsorbing mechanism, passes
Band side is sent to be provided with the electronic cylinder component of boosting, the electronic cylinder component of boosting includes electric cylinder, connecting rod and guide plate, electric cylinder
Two connecting rods being separated by a certain distance are provided with, the connecting rod is provided with guide plate, and the gap between two guide plates is more than
The thickness of pinnule.
Further, the adsorbing mechanism is electromagnet.
Further, the adsorbing mechanism is sucker, and the sucker is connected with a vavuum pump.
Further, between the big level board and middle part connecting plate angle angle be 90 degree, the middle part connecting plate and
Angle is less than 90 degree between pinnule.
Further, the radial direction bracket is for the hot rolling strip strip bending of Q345B is formed by material.
Further, also including auxiliary mounting table and an automatic transporting mechanism, the auxiliary mounting table includes that two install
Bar, is provided with multiple cylinders for promoting radial direction bracket on the mounting bar, two mounting bar outsides are respectively provided with one
Automatic transporting mechanism, the automatic transporting mechanism includes a mounting bracket, and the mounting bracket is provided with two rollers, two rollers
On conveyer belt is installed, the roller is connected with motor, and the terminal position of conveyer belt transmission is placed with a resorption electric cylinder, described
Resorption electric cylinder is provided with an installing plate, and the installing plate is provided with adsorbing mechanism, and conveyer belt side is provided with boosting electric cylinder group
Part, the electronic cylinder component of boosting includes electric cylinder, connecting rod and guide plate, and electric cylinder is provided with two companies being separated by a certain distance
Extension bar, the connecting rod is provided with guide plate, thickness of the gap between two guide plates more than pinnule.
The beneficial effects of the invention are as follows：
If of the invention simple using radial direction bracket, Bundling strap is substituted, save tie cost, improve high-strength hot-rolled
Strip coil of strip fetters ability, eliminates coil of strip loose winding, dissipates volume problem, greatly improves the packaging and fortune of high-strength hot-rolled coil of strip
Defeated, processing operating environment；Coil of strip inwall is clinged to by Gravitative Loads bending fastening plates parallel-segment part, without manual intervention,
Reduce and carry out labour intensity；Fastening twisted plate is formed using hot rolling Q345 ranks strip cutting bending machining, it is ensured that fastening bending
Plate global consistency and security；Bolt length is equipped with according to coil of strip diameter, reduces fastening bolt holding time；Bolt and nut
Using standard size, it is easy to buying, it is time saving and energy saving, improve the high-strength hot-rolled packing of strip coil of strip efficiency and security；This hair
The design of bright radial direction bracket, auxiliary mounting table and automatic transporting mechanism, first enhances automaticity, improves effect
Rate, it is to avoid artificial excessive participation, save manpower, it is to avoid the Discussion on personnel casualty problem caused in operating process.
Brief description of the drawings
Fig. 1 is top view of the invention；
Fig. 2 is the three dimensional structure diagram of radial direction bracket；
Fig. 3 is the partial enlarged drawing at A in Fig. 1；
Fig. 4 is the partial enlarged drawing at B in Fig. 1；
Fig. 5 be radial direction bracket be arranged on coil of strip on when state diagram；
Fig. 6 is the second embodiment of the present invention.
In figure：1 radial direction bracket, 101 big level boards, 102 middle part connecting plates, 103 pinnules, 104 bolts hole, 2 pass
Send band, 3 rollers, the electronic cylinder component of 4 boostings, 401 electric cylinders, 402 connecting rods, 403 guide plates, 5 resorption electric cylinders, 6 installing plates,
7 adsorbing mechanisms, 8 slide units, 9 slide rails, 10 sliding blocks, 11 rotary electric machines, 12 saddles, 13 grip blocks, 14 non-slipping blocks, 15 connecting shafts, 16
Coil of strip.
Specific embodiment
As shown in Figures 1 to 4,
A kind of high-strength hot-rolled strip coil of strip radial tightening device includes a radial direction bracket 1, as shown in Fig. 2 this is radially
Bracket include big level board 101, middle part connecting plate 102, pinnule 103 and bolt hole 104, the big level board 101, in
Portion's connecting plate 102, pinnule 103 are processed for a hot rolling strip strip clod wash, and big level board both sides are symmetrically rolled over
It is curved to have middle part connecting plate and pinnule.
A kind of prioritization scheme, between the big level board 101 and middle part connecting plate 102 angle angle be 90 degree, it is described in
Angle is less than 90 degree between portion's connecting plate 102 and pinnule 103.
The big level board 101, middle part connecting plate 102, the material of pinnule 103 are Q345B.
Multiple bolts hole are provided with pinnule, the diameter of bolt hole is preferably 18mm.
When using, as shown in figure 5, after high-strength hot-rolled strip coil of strip is transported to step rate packing region by producing line, by footpath
Penetrated by core of steel coil near coil of strip bottom sides to bracket 1, by Action of Gravity Field so that the big level board of radial direction bracket 1
101 are fitted with coil of strip inwall, and another bottom of radial direction bracket 1 is arranged along coil of strip side outer wall, and cause pinnule
Bolt hole correspondence；
Six fastening bolts are inserted in the bolt hole of radial direction bracket 1 successively；And clamp nut is fastened to fastening bolt
On.
A kind of optimization design, also including an auxiliary mounting table.It is described auxiliary mounting table include slide unit 8, slide rail 9, sliding block 10,
Rotary electric machine 11, saddle 12, grip block 13, non-slipping block 14 and connecting shaft 15, the slide rail 9 are provided with sliding block 10, two sliding blocks
Support sets up slide unit 8, as shown in figure 1, between being provided with the high-strength hot-rolled strip coil of strip of a placement between two slide units 8
Gap, the coil of strip that can adjust the suitable various different in width of the distance between two slide units by sliding-rail sliding is used.On slide unit 8
Saddle 12 is provided with for placing radial direction bracket 1, when high-strength hot-rolled strip coil of strip is placed in gap, radial direction is fastened
Bar 1 is penetrated from core of steel coil so that two pinnules of radial direction bracket 1 are both placed on saddle, then high-strength hot-rolled
Strip coil of strip is moved down in the presence of straddle truck or other hanging devices by self gravitation effect, so that radially fastening
Bar 1 is brought into close contact with coil of strip, places another radial direction bracket and is arranged along coil of strip side outer wall, and causes two radial direction brackets
The bolt hole correspondence of pinnule, blending bolt is fastened.
A kind of optimization design, is provided with the grip block 13 of one and cylinders on saddle, is provided with the grip block 13
Non-slipping block 14, saddle is connected by connecting shaft 15 with rotary electric machine 11, and the rotary electric machine is arranged on slide unit, rotary electric machine
11 angles that can adjust saddle, when placing radial direction 1 angle of bracket and being improper, angle are adjusted using motor control, it is to avoid
The extruding accident that the manual adjustment radial direction bracket 1 is caused when coil of strip is pushed.Eliminate potential safety hazard.
More further, as shown in figure 1, also including an automatic transporting mechanism, the automatic transporting mechanism includes that one installs
Frame, the mounting bracket is provided with two rollers 3, and conveyer belt 2 is provided with two rollers 3, and the roller is connected with motor, passes
The terminal position with transmission is sent to be placed with a resorption electric cylinder, the resorption electric cylinder is provided with an installing plate 6, the installing plate
6 are provided with adsorbing mechanism 7, cause one of radial direction bracket 1 with other radial direction brackets 1 apart from change by adsorbing mechanism 7
Greatly, it is to avoid maloperation occur.
A kind of optimization design, the adsorbing mechanism 7 can be electromagnet, be adsorbed the radial direction bracket 1 by magneticaction
One segment distance.
A kind of optimization design, the adsorbing mechanism 7 can be sucker, and the sucker is connected with a vavuum pump, is imitated by negative pressure
Really, the radial direction bracket 1 is adsorbed into a segment distance.
Conveyer belt side is provided with the electronic cylinder component 4 of boosting, and the electronic cylinder component 4 of boosting includes electric cylinder 401, connecting rod
402 and guide plate 403, electric cylinder 401 is provided with two connecting rods 402 being separated by a certain distance, and the connecting rod 402 is provided with to be led
To plate 403, thickness of the gap more than pinnule 103 between two guide plates 403.
So the gap between two guide plates 403 can be utilized to cause radial direction bracket 1 by the flexible of electric cylinder 401
Moved along the distance stretched out of electric cylinder 401.
Fig. 6 is the second embodiment of the present invention, is with first embodiment difference, and the auxiliary mounting table includes two
Mounting bar 17, is provided with multiple cylinders 18 for promoting radial direction bracket on the mounting bar 17.Two mounting bars 17
Outside is respectively provided with an automatic transporting mechanism.
Coil of strip 16 is located at the gap between two mounting bars, and from the point of view of Fig. 6, the automatic transporting mechanism below mounting bar will
In the endoporus of radial direction bracket push-in coil of strip, then in the presence of cylinder 18, radial direction bracket compacting coil of strip inner surface is located at
Be pushed into another radial direction bracket on mounting bar by the automatic transporting mechanism above mounting bar, cylinder by the radial direction bracket be depressed into
Coil of strip flush with outer surface so that the bolt hole of two radial direction brackets is fixed to good so as to be convenient for people to installation bolt.
In addition to the technical characteristic described in specification, the known technology of those skilled in the art is.
Claims (8)
1. a kind of high-strength hot-rolled strip coil of strip radial tightening device, it is characterized in that, an including radial direction bracket, the radial direction is tight
Gu bar includes big level board, middle part connecting plate, pinnule and bolt hole, the big level board, middle part connecting plate, pinnule
For a hot rolling strip strip clod wash is processed, and big level board both sides are symmetrically bent with middle part connecting plate and small level
Plate, is provided with multiple bolts hole on pinnule.
2. a kind of high-strength hot-rolled strip coil of strip radial tightening device according to claim 1, it is characterized in that, also including one
Auxiliary mounting table, the auxiliary mounting table includes slide unit, slide rail, sliding block, rotary electric machine, saddle, grip block, non-slipping block and connection
Axle, the slide rail is provided with sliding block, and two slider brackets set up slide unit, and a placement high intensity is provided between two slide units
The gap of hot rolling belt steel roll, is provided with the saddle for placing radial direction bracket on slide unit, and one and cylinder are provided with saddle
Connected grip block, is provided with non-slipping block on the grip block, saddle is connected by connecting shaft with rotary electric machine, the rotation
Motor is arranged on slide unit.
3. a kind of high-strength hot-rolled strip coil of strip radial tightening device according to claim 2, it is characterized in that, also including one
Automatic transporting mechanism, the automatic transporting mechanism includes a mounting bracket, and the mounting bracket is provided with two rollers, two rollers
On conveyer belt is installed, the roller is connected with motor, and the terminal position of conveyer belt transmission is placed with a resorption electric cylinder, described
Resorption electric cylinder is provided with an installing plate, and the installing plate is provided with adsorbing mechanism, and conveyer belt side is provided with boosting electric cylinder group
Part, the electronic cylinder component of boosting includes electric cylinder, connecting rod and guide plate, and electric cylinder is provided with two companies being separated by a certain distance
Extension bar, the connecting rod is provided with guide plate, thickness of the gap between two guide plates more than pinnule.
4. a kind of high-strength hot-rolled strip coil of strip radial tightening device according to claim 3, it is characterized in that, the absorption
Mechanism is electromagnet.
5. a kind of high-strength hot-rolled strip coil of strip radial tightening device according to claim 3, it is characterized in that, the absorption
Mechanism is sucker, and the sucker is connected with a vavuum pump.
6. a kind of high-strength hot-rolled strip coil of strip radial tightening device according to claim 1, it is characterized in that, the flood
Angle angle is 90 degree between flat board and middle part connecting plate, and angle is less than 90 degree between the middle part connecting plate and pinnule.
7. a kind of high-strength hot-rolled strip coil of strip radial tightening device according to claim 1, it is characterized in that, the radial direction
Bracket is for the hot rolling strip strip bending of Q345B is formed by material.
8. a kind of high-strength hot-rolled strip coil of strip radial tightening device according to claim 1, it is characterized in that, also including one
Auxiliary mounting table and an automatic transporting mechanism, the auxiliary mounting table include two mounting bars, multiple are provided with the mounting bar
Cylinder for promoting radial direction bracket, two mounting bar outsides are respectively provided with an automatic transporting mechanism, the automatic transporting
Mechanism includes a mounting bracket, and the mounting bracket is provided with two rollers, and conveyer belt is provided with two rollers, and the roller connects
Motor is connected to, the terminal position of conveyer belt transmission is placed with a resorption electric cylinder, and the resorption electric cylinder is provided with an installing plate,
The installing plate is provided with adsorbing mechanism, and conveyer belt side is provided with the electronic cylinder component of boosting, and the electronic cylinder component of boosting includes
Electric cylinder, connecting rod and guide plate, electric cylinder are provided with two connecting rods being separated by a certain distance, and the connecting rod is provided with guiding
Plate, thickness of the gap more than pinnule between two guide plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611139398.2A CN106697369A (en) | 2016-12-12 | 2016-12-12 | Radial fastening device of high-strength hot rolled strip steel coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611139398.2A CN106697369A (en) | 2016-12-12 | 2016-12-12 | Radial fastening device of high-strength hot rolled strip steel coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106697369A true CN106697369A (en) | 2017-05-24 |
Family
ID=58936757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611139398.2A Pending CN106697369A (en) | 2016-12-12 | 2016-12-12 | Radial fastening device of high-strength hot rolled strip steel coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106697369A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725872A (en) * | 2018-05-28 | 2018-11-02 | 中冶华天南京工程技术有限公司 | A kind of automatic bounding system of energy-saving shaped steel and technique |
| CN109365566A (en) * | 2018-11-28 | 2019-02-22 | 涿州市诚达设备制造有限公司 | A kind of way moving suction and conveying devices for taking-up in strip producing line |
| CN109649710A (en) * | 2018-12-28 | 2019-04-19 | 广东伟创五洋智能设备有限公司 | Automatically enter case apparatus |
| CN110817514A (en) * | 2019-11-12 | 2020-02-21 | 安顿雷纳新材料(江苏)有限公司 | Graphite felt electrode applied to efficient energy storage battery and manufacturing method thereof |
| CN116142627A (en) * | 2023-02-10 | 2023-05-23 | 包头钢铁（集团）有限责任公司 | Auxiliary fixing clamp for protecting tail and head of steel tape |
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| CN2334717Y (en) * | 1998-07-31 | 1999-08-25 | 宝山钢铁(集团)公司 | Reinforcing device for bundling steel coil |
| WO2007074981A1 (en) * | 2005-12-29 | 2007-07-05 | Samjung Packing & Aluminum Co., Ltd. | Apparatus for packaging steel coil with protective sheet |
| CN200992354Y (en) * | 2006-12-20 | 2007-12-19 | 鞍钢附企科达设备有限公司 | Reinforcing belt for steel-roll bundling |
| CN201287835Y (en) * | 2008-09-04 | 2009-08-12 | 武汉北湖盛和包装科技有限公司 | Section bar fastener |
| CN201784898U (en) * | 2010-09-07 | 2011-04-06 | 宝钢发展有限公司 | O-shaped clamp for package of high-strength hot rolled steel coil |
| CN203712562U (en) * | 2014-02-24 | 2014-07-16 | 无锡市广润金属制品有限公司 | Fixing device for integrated metal strips |
| CN206336463U (en) * | 2016-12-12 | 2017-07-18 | 山东钢铁股份有限公司 | A kind of high-strength hot-rolled strip coil of strip radial tightening device |
-
2016
- 2016-12-12 CN CN201611139398.2A patent/CN106697369A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2334717Y (en) * | 1998-07-31 | 1999-08-25 | 宝山钢铁(集团)公司 | Reinforcing device for bundling steel coil |
| WO2007074981A1 (en) * | 2005-12-29 | 2007-07-05 | Samjung Packing & Aluminum Co., Ltd. | Apparatus for packaging steel coil with protective sheet |
| CN200992354Y (en) * | 2006-12-20 | 2007-12-19 | 鞍钢附企科达设备有限公司 | Reinforcing belt for steel-roll bundling |
| CN201287835Y (en) * | 2008-09-04 | 2009-08-12 | 武汉北湖盛和包装科技有限公司 | Section bar fastener |
| CN201784898U (en) * | 2010-09-07 | 2011-04-06 | 宝钢发展有限公司 | O-shaped clamp for package of high-strength hot rolled steel coil |
| CN203712562U (en) * | 2014-02-24 | 2014-07-16 | 无锡市广润金属制品有限公司 | Fixing device for integrated metal strips |
| CN206336463U (en) * | 2016-12-12 | 2017-07-18 | 山东钢铁股份有限公司 | A kind of high-strength hot-rolled strip coil of strip radial tightening device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725872A (en) * | 2018-05-28 | 2018-11-02 | 中冶华天南京工程技术有限公司 | A kind of automatic bounding system of energy-saving shaped steel and technique |
| CN108725872B (en) * | 2018-05-28 | 2020-06-30 | 中冶华天南京工程技术有限公司 | Energy-saving type automatic steel bundling system and process |
| CN109365566A (en) * | 2018-11-28 | 2019-02-22 | 涿州市诚达设备制造有限公司 | A kind of way moving suction and conveying devices for taking-up in strip producing line |
| CN109649710A (en) * | 2018-12-28 | 2019-04-19 | 广东伟创五洋智能设备有限公司 | Automatically enter case apparatus |
| CN110817514A (en) * | 2019-11-12 | 2020-02-21 | 安顿雷纳新材料(江苏)有限公司 | Graphite felt electrode applied to efficient energy storage battery and manufacturing method thereof |
| CN116142627A (en) * | 2023-02-10 | 2023-05-23 | 包头钢铁（集团）有限责任公司 | Auxiliary fixing clamp for protecting tail and head of steel tape |
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