CN107442618A - A kind of processing unit (plant) of various shaped fishplate - Google Patents
A kind of processing unit (plant) of various shaped fishplate Download PDFInfo
- Publication number
- CN107442618A CN107442618A CN201710827883.7A CN201710827883A CN107442618A CN 107442618 A CN107442618 A CN 107442618A CN 201710827883 A CN201710827883 A CN 201710827883A CN 107442618 A CN107442618 A CN 107442618A
- Authority
- CN
- China
- Prior art keywords
- plate
- fixed
- limiting plate
- pellet
- limit assembly
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
Abstract
The invention provides a kind of technical scheme of the processing unit (plant) of various shaped fishplate, the front and rear of the bottom plate is separately provided for the V of various shaped fishplate to the front limit component and rear limit assembly fixed, and the top of the bottom plate is provided with for the U to various shaped fishplate to the upper limit assembly fixed；Not homonymy in the front limit component and in rear limit assembly is respectively arranged with elastic component, and the side in the upper limit assembly is provided with elastic component.The present invention enters positioning to compromising joint bar to be processed using front limit component, rear limit assembly and upper limit assembly and compressed, and the not homonymy in the front limit component and in rear limit assembly is respectively arranged with elastic component, side in the upper limit assembly is provided with elastic component, Bidirectional molding to workpiece can be completed by realizing one-time positioning, positioning precision is high, available for the quick production of high-volume.
Description
Technical field
The present invention relates to metal working technical area, especially a kind of processing unit (plant) of various shaped fishplate.
Background technology
Fish platee（Rail joint clamping plate）Clamping plate is commonly called as, connection function is played in track joint.Be divided into light rail, heavy rail and
Overweight rail.Fish platee is a kind of for connecting the securing member used between track and track.Various shaped fishplate is different from general
Logical fish platee, is the rail joint position for non-rail type of the same race in railway rail system.
Compromising joint bar is due to its unique function, and quantity is big, and specification is more, and for connecting different rail types, size then needs
To adjust accordingly, due to the particularity of its application, concern the security of train operation, then its product is proposed accordingly
Technical requirements, i.e., with preferable mechanical property（The rail connected better than it）, there is good resistance shear stress, impact
Stress, the performance indications such as antifatigue, wear-resisting.
The structural form of compromising joint bar is shown in Fig. 7, and difference is the bending of central part with common road clamping plate, is divided into vertical
To bending and transverse fold, its bending amount is different according to the docking demand of track.Production for its standardization brings restriction, is
The outward appearance, the uniformity of structure, stability with batch products are ensured, using the local forging method of transmission, is generally required repeatedly
Positioning, correction, examine.It is difficult to effectively control in standardized production management, the process of technique and final quality control etc..
This is the weak point present in prior art.
The content of the invention
The technical problems to be solved by the invention, aiming at the deficiency present in prior art, and provide a kind of special-shaped
The technical scheme of the processing unit (plant) of fish platee.
This programme is achieved by the following technical measures：A kind of processing unit (plant) of various shaped fishplate, including main floor,
The bottom plate to match with the lower surface of the compromising joint bar is provided with the main floor, the front portion of the bottom plate is with after
Portion is separately provided for the V of various shaped fishplate to the front limit component and rear limit assembly fixed, under described
The top of supporting plate is provided with for the U to various shaped fishplate to the upper limit assembly fixed；The front limit component
Along V to moving after being driven from the first drive mechanism, the rear left limit assembly is fixed on the main floor, the upper limit hyte
Part driven from the second drive mechanism after along U to moving；Not homonymy in the front limit component and in rear limit assembly is set respectively
It is equipped with elastic component, the side in the upper limit assembly is provided with elastic component.
Further improvement of the present invention also has, and the front portion of the main floor is fixed with right baffle-plate and right shell body, the left gear
Oil cylinder fixed plate is fixedly connected between plate and right shell body, hydraulic cylinder is fixed with the oil cylinder fixed plate, the hydraulic cylinder
Output shaft is fixedly connected with L-type sliding panel, and the L-type sliding panel is located at the top of the main floor.
Further improvement of the present invention also has, and the front limit component includes front left limiting plate, pellet IV, rubber cushion III, preceding
Right limit plate and pellet III, the front left limiting plate are fixed on the left side that the L-type slides front edge of board, build-in in the pellet IV
The front portion of the front left limiting plate is scheduled on, the rubber cushion III is between front left limiting plate and L-type sliding panel, the preceding right limit
Plate is slidably arranged on lead II, and the lead II is fixed on the right side that the L-type slides front edge of board, positioned at preceding right limit
Between plate and L-type sliding panel to return spring II is socketed with post II, the pellet III is embedded be fixed on front right limiting plate before
Portion.
Further improvement of the present invention also has, and the rear limit assembly includes rear left limiting plate, pellet II, rear right limit
Plate, pellet I and rubber cushion II, the rear left limiting plate are fixed on main floor, and the pellet II is embedded to be fixed on rear left limiting plate
Rear portion, the rear right limiting plate is slidably arranged on lead I, and the lead I is fixed on main floor, is limited positioned at rear right
Be provided with return spring I on lead I between position plate and main floor, the pellet I is embedded be fixed on rear right limiting plate after
Portion, the rubber cushion II is between rear right limiting plate and pellet I.
Further improvement of the present invention also has, and the upper limit assembly includes upper limit plate, pushes punch die, upper cylinder connection
Plate, the upper limit plate and one end docking fixation for pushing punch die, the upper limit plate oil with embedded be fixed on of punch die is pushed
In cylinder connecting plate, rubber cushion I is provided between the upper limit plate and upper cylinder connecting plate.
Further improvement of the present invention also has, and described push is provided with adjusting gasket between punch die and upper cylinder connecting plate.
Further improvement of the present invention also has, and proximity switch is provided with the outside of the right baffle-plate, the L-type sliding panel
Left side is provided with the positive stop strip to match with the proximity switch.
Further improvement of the present invention also has, and feather key is installed with the inside of the right baffle-plate.
This programme has the beneficial effect that：
（1）The present invention enters positioning using front limit component, rear limit assembly and upper limit assembly to compromising joint bar to be processed
And compression, and the not homonymy in the front limit component and in rear limit assembly is respectively arranged with elastic component, the upper limit
Side in component is provided with elastic component, and Bidirectional molding to workpiece can be completed by realizing one-time positioning, and positioning precision is high, can
For the quick production of high-volume；
（2）During using the present invention, processing can be matched according to the difference of the offsetting parameter of compromising joint bar in needs of production,
It is versatile to adapt to identical or approximate specifications and models；
（3）The present invention is simple to operate, and safe and reliable, repair rate is low.
As can be seen here, the present invention is compared with prior art, with prominent substantive distinguishing features and significantly progressive, its implementation
Beneficial effect be also obvious.
Brief description of the drawings
Fig. 1 is the structural representation of the specific embodiment of the invention.
Fig. 2 is Fig. 1 left view.
Fig. 3 is Fig. 2 A-A cross section structure diagrams.
Fig. 4 is Fig. 3 B-B cross section structure diagrams.
Fig. 5 is Fig. 3 D-D cross section structure diagrams.
Fig. 6 is Fig. 1 broken section structural representation.
Fig. 7 is the structural representation of compromising joint bar of the present invention.
In figure, 1 is main floor, and 2 be bottom plate, and 3 be upper limit plate, and 4 be fish tail plate blank material, and 5 be rear right limiting plate, and 6 are
Rear left limiting plate, 7 be pellet I, and 8 be L-type sliding panel, and 9 be right shell body, and 10 be right baffle-plate, and 11 be front left limiting plate, and 12 be pellet
IV, 13 be front right limiting plate, and 14 be pellet III, and 15 be upper cylinder gusset piece, and 16 be oil cylinder fixed plate, and 17 be hydraulic cylinder, and 18 are
Bolt, 19 is push punch die, and 20 be pellet II, and 21 be lead I, and 22 be return spring I, and 23 be lead II, and 24 be roundlet
Nut, 25 be rubber cushion I, and 27 be feather key, and 28 be bolt, and 29 be rubber cushion II, and 30 be rubber cushion III, and 31 be proximity switch bearing, 32
For proximity switch, 33 be positive stop strip, and 34 be screw, 35 return springs II, 36 for vertically to（U to）Hydraulic pressure device, 37 are
Adjusting gasket.
Embodiment
For the technical characterstic for illustrating this programme can be understood, below by an embodiment, and its accompanying drawing is combined, it is right
This programme is illustrated.
A kind of processing unit (plant) of various shaped fishplate, including main floor 1, it is provided with and the special-shaped fish on the main floor 1
The bottom plate 2 that the lower surface of tailgate matches, the front and rear of the bottom plate 2 are separately provided for various shaped fishplate
V to the front limit component and rear limit assembly fixed, the top of the bottom plate 2 is provided with for special-shaped fish
The U of tailgate is to the upper limit assembly fixed；The front limit component driven from the first drive mechanism after along V to fortune
Dynamic, the rear left limit assembly is fixed on the main floor 1, the upper limit assembly driven by the second drive mechanism after along U
To motion；Not homonymy in the front limit component and in rear limit assembly is respectively arranged with elastic component, the upper limit assembly
Interior side is provided with elastic component.
The front portion of the main floor is fixed with right baffle-plate 10 and right shell body 9, is connected between the right baffle-plate 10 and right shell body 9
Oil cylinder fixed plate 16 is fixed with, hydraulic cylinder 17, the output shaft and L-type of the hydraulic cylinder 17 are fixed with the oil cylinder fixed plate 16
Sliding panel 8 is fixedly connected, and the L-type sliding panel 8 is located at the top of the main floor 1.
The front limit component includes front left limiting plate 11, pellet IV 12, rubber cushion III 30, front right limiting plate 13 and pellet III
14, the front left limiting plate 11 is fixed on the left side of the front end of L-type sliding panel 8, the pellet IV 12 is embedded be fixed on it is described
The front portion of front left limiting plate 11, the rubber cushion III 30 is between front left limiting plate 11 and L-type sliding panel 8, the preceding right limit
Plate 13 is slidably arranged on lead II 23, and the lead II 23 is fixed on the right side of the front end of L-type sliding panel 8, is located at
Return spring II 35 is socketed with lead II 23 between front right limiting plate 13 and L-type sliding panel 8, in the pellet III 14
Build-in is anterior due to front right limiting plate 13.
Limit assembly includes rear left limiting plate 6, pellet II 20, rear right limiting plate 5, pellet I 7 and rubber cushion II 29 after described,
The rear left limiting plate 6 is fixed on main floor 1, the embedded rear portion for being fixed on rear left limiting plate 6 of the pellet II 20, after described
Right limit plate 5 is slidably arranged on lead I 21, and the lead I 21 is fixed on main floor 1, positioned at rear right limiting plate 5 with
Return spring I 22 is provided with lead I 21 between main floor 1, the pellet I 7 is embedded to be fixed on rear right limiting plate 5
Rear portion, the rubber cushion II 29 is between rear right limiting plate 5 and pellet I 7.
The upper limit assembly includes upper limit plate 3, pushes punch die 19, upper cylinder connecting plate 15, the upper limit plate and 3
One end docking for pushing punch die 19 is fixed, and the upper limit plate 3 and pushes that punch die 19 is embedded to be fixed in upper cylinder connecting plate 15,
Rubber cushion I 25 is provided between the upper limit plate 3 and upper cylinder connecting plate 15.It is described to push punch die 19 and upper cylinder connecting plate 15
Between be provided with adjusting gasket 37.
The left side of the right baffle-plate 10 is provided with proximity switch 32, and the left side of the L-type sliding panel 8 is provided with to be connect with described
The positive stop strip 33 that nearly switch 32 matches.The inner side of the right baffle-plate 10 is installed with feather key 27.The left side of whole device
Portion is constant, right part limiting plate in the horizontal direction（Front right limiting plate 13 and rear right limited block 5）, it is equipped with back
Position spring, they fluctuate when press work.This when, the leftmost side feather key 27 for
For the component in hydraulic cylinder direction, guide-localization orientation is served.
In actual use, the upper end of upper cylinder connecting plate 15 is connected with vertical to hydraulic pressure device 36, as
The compatible universal of the design organization, the hydraulic press of work can be vertically vertically oriented to hydraulic pressure device 36, or
Person is hydraulic cylinder lifting combination, not as constraint qualification, disclosure satisfy that the pressure of vertical direction pushes output and lifting, that is, is considered as
Meet to require.
Being connected between workpiece, can be the various ways such as hot charging is inlayed, standard component is connected or welds, no
As the restriction condition for constraining its inventive structure, to realize that its production function is used as final purpose.
Operation principle：
First stage, vertically drive upper limit plate 3 to hydraulic pressure device 36 and push punch die 19 and lifted, synchronous, hydraulic cylinder
17 drive its associate member front left limiting plate 11, front right limiting plate 13, pellet III 14, pellet IV 12 by L-type sliding panel 8
Integrally retreated Deng part, concede the upper material space of workpiece.Local pre-warmed fish tail plate blank material 4 is placed in subiculum by Y-direction blowing
On plate 2, the groove on bottom plate 2 is cambered identical with fish tail plate blank material 4, realizes quick pre-determined bit.
Second stage, for hydraulic cylinder 17 after confirming workpiece blank 4 in place, the output shaft of hydraulic cylinder 17 promotes L-type to slide
Plate 8, pellet II 6, pellet IV 12, pellet III 14 contact with workpiece blank 4 first, similarly, vertically to hydraulic pressure device
36 drive upper limit plates 3 and push punch die 19 and push, fish tail plate blank material 4 contacts with bottom plate 2, upper limit plate 3, realizes workpiece
Three direction moments positioning；
Second stage synchronization, vertically pushed to hydraulic pressure device 36, the upper end of workpiece blank 4 closely connects with upper limit plate 3
Touch, the top of upper limit plate 3 is provided with rubber cushion I 25, stress buffering during for workpiece instantaneous touch, realize jointly its U to
The spacing fixation in upper end；
When the output shaft of hydraulic cylinder 17 promotes the work of L-type sliding panel 8, positive stop strip 33 contacts with proximity switch 32, realizes row
The spacing of journey has positioning groove with stopping, on proximity switch 32, can adjust its according to the offsetting specification of different product and limit position
Put, while offsetting amount can be effectively accomplished, ensure that oil cylinder overtravel destroys workpiece, play safety protection function.
Phase III, U apply pressure to V to synchronous, and the oil cylinder piston of hydraulic cylinder 17 continues to promote, and rubber cushion II 29 exists
Stress effect is lower to occur elastic deformation, and pellet III 14 implements thrust, workpiece realize V to offsetting deformation；
Phase III synchronization, lower stamping die 19 contacts forging and stamping with fish tail plate blank material 4, realizes U to offsetting.The upper end of upper limit plate 3
Rubber cushion I 25 occur elastic deformation compensator or trimmer pressure, offsetting amount is by pushing the regulation between punch die 19 and upper cylinder connecting plate 15
Pad 37 realizes accurate adjustment；
Adjusting gasket 37 is the sheet metal in groups that does of compromising joint bar shaping, and width is to adapt in upper cylinder connecting plate 15
Recess width is defined, and different thickness is matched according to different offsetting amounts.
Fourth stage, roll forming, first stage step is repeated, is vertically risen to hydraulic pressure device 36, hydraulic cylinder
17 drive its associate member to retreat, and withdraw from the workpiece blank 4 being molded, and assemble next workpiece, realize circulation production.
Although above-mentioned the embodiment of invention is described with reference to accompanying drawing, not to the scope of the present invention
Limitation, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not required to
Various modifications or deformation that creative work can make are paid still within protection scope of the present invention.
Claims (8)
1. a kind of processing unit (plant) of various shaped fishplate, it is characterized in that：Including main floor, be provided with the main floor with it is described different
The bottom plate that the lower surface of shape fish platee matches, the front and rear of the bottom plate are separately provided for special-shaped fish tail
The V of plate is provided with for abnormal shape to the front limit component and rear limit assembly fixed, the top of the bottom plate
The U of fish platee is to the upper limit assembly fixed；The front limit component driven from the first drive mechanism after along V to fortune
Dynamic, the rear left limit assembly is fixed on the main floor, the upper limit assembly driven from the second drive mechanism after along U to
Motion；Not homonymy in the front limit component and in rear limit assembly is respectively arranged with elastic component, in the upper limit assembly
Side be provided with elastic component.
2. the processing unit (plant) of various shaped fishplate according to claim 1, it is characterized in that：The front portion of the main floor is fixed with
Right baffle-plate and right shell body, oil cylinder fixed plate is fixedly connected between the right baffle-plate and right shell body, is consolidated in the oil cylinder fixed plate
Surely there is hydraulic cylinder, the output shaft of the hydraulic cylinder is fixedly connected with L-type sliding panel, and the L-type sliding panel is located at the main floor
Top.
3. the processing unit (plant) of various shaped fishplate according to claim 1 or 2, it is characterized in that：The front limit component includes
Front left limiting plate, pellet IV, rubber cushion III, front right limiting plate and pellet III, the front left limiting plate are fixed on the L-type sliding panel
The left side of front end, the embedded front portion for being fixed on the front left limiting plate of the pellet IV, the rubber cushion III are located at front left limiting plate
Between L-type sliding panel, the front right limiting plate is slidably arranged on lead II, and the lead II is fixed on the L-type
Slide the right side of front edge of board, between front right limiting plate and L-type sliding panel to being socketed with return spring II on post II, it is described
Pellet III is embedded to be fixed on the spacing prelaminar part of front right.
4. the processing unit (plant) of various shaped fishplate according to claim 3, it is characterized in that：Limit assembly includes rear left after described
Limiting plate, pellet II, rear right limiting plate, pellet I and rubber cushion II, the rear left limiting plate are fixed on main floor, the pellet
The II embedded rear portion for being fixed on rear left limiting plate, the rear right limiting plate are slidably arranged on lead I, and the lead I is solid
It is scheduled on main floor, return spring I, the pellet I is provided with the lead I between rear right limiting plate and main floor
The embedded rear portion for being fixed on rear right limiting plate, the rubber cushion II is between rear right limiting plate and pellet I.
5. the processing unit (plant) of various shaped fishplate according to claim 3, it is characterized in that：The upper limit assembly includes the upper limit
Position plate, push punch die, upper cylinder connecting plate, the upper limit plate and one end docking fixation for pushing punch die, the upper limit plate
It is fixed on pushing punch die and embedding in upper cylinder connecting plate, rubber cushion I is provided between the upper limit plate and upper cylinder connecting plate.
6. the processing unit (plant) of various shaped fishplate according to claim 5, it is characterized in that：The punch die that pushes connects with upper cylinder
Adjusting gasket is provided between fishplate bar.
7. the processing unit (plant) of the various shaped fishplate according to claim 2 or 4 or 5 or 6, it is characterized in that：The right baffle-plate
Outside is provided with proximity switch, and the positive stop strip to match with the proximity switch is provided with the left of the L-type sliding panel.
8. the processing unit (plant) of the various shaped fishplate according to claim 2 or 4 or 5 or 6, it is characterized in that：The right baffle-plate
Inner side is installed with feather key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827883.7A CN107442618B (en) | 2017-09-14 | 2017-09-14 | Machining device for special-shaped fishplates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827883.7A CN107442618B (en) | 2017-09-14 | 2017-09-14 | Machining device for special-shaped fishplates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107442618A true CN107442618A (en) | 2017-12-08 |
| CN107442618B CN107442618B (en) | 2023-09-26 |
Family
ID=60496602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710827883.7A Active CN107442618B (en) | 2017-09-14 | 2017-09-14 | Machining device for special-shaped fishplates |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107442618B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108857895A (en) * | 2018-08-09 | 2018-11-23 | 中铁上海工程局集团有限公司 | Adjustable aligning steel rail clamping device and its application method |
| CN108856398A (en) * | 2018-05-31 | 2018-11-23 | 宁波信泰机械有限公司 | A kind of automotive trim strip small bend angle apparatus for bending |
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|---|---|---|---|---|
| JPH06320220A (en) * | 1993-07-09 | 1994-11-22 | Amada Co Ltd | Hydraulic press brake |
| CN105537487A (en) * | 2016-01-27 | 2016-05-04 | 山东远大特材科技股份有限公司 | Manufacturing method for special-shaped fishplate and dies |
| CN205362317U (en) * | 2015-12-05 | 2016-07-06 | 天津市顺达汽车零部件有限公司 | Novel stabilizer bar thermoforming device |
| CN106946167A (en) * | 2017-05-09 | 2017-07-14 | 徐州建机工程机械有限公司 | A kind of New-type plate fish tail board component |
| CN207430985U (en) * | 2017-09-14 | 2018-06-01 | 山东远大特材科技股份有限公司 | A kind of processing unit (plant) of various shaped fishplate |
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2017
- 2017-09-14 CN CN201710827883.7A patent/CN107442618B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06320220A (en) * | 1993-07-09 | 1994-11-22 | Amada Co Ltd | Hydraulic press brake |
| CN205362317U (en) * | 2015-12-05 | 2016-07-06 | 天津市顺达汽车零部件有限公司 | Novel stabilizer bar thermoforming device |
| CN105537487A (en) * | 2016-01-27 | 2016-05-04 | 山东远大特材科技股份有限公司 | Manufacturing method for special-shaped fishplate and dies |
| CN106946167A (en) * | 2017-05-09 | 2017-07-14 | 徐州建机工程机械有限公司 | A kind of New-type plate fish tail board component |
| CN207430985U (en) * | 2017-09-14 | 2018-06-01 | 山东远大特材科技股份有限公司 | A kind of processing unit (plant) of various shaped fishplate |
Non-Patent Citations (1)
| Title |
|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108856398A (en) * | 2018-05-31 | 2018-11-23 | 宁波信泰机械有限公司 | A kind of automotive trim strip small bend angle apparatus for bending |
| CN108857895A (en) * | 2018-08-09 | 2018-11-23 | 中铁上海工程局集团有限公司 | Adjustable aligning steel rail clamping device and its application method |
| CN108857895B (en) * | 2018-08-09 | 2023-05-12 | 中铁上海工程局集团有限公司 | Adjustable straightening steel rail clamping device and use method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107442618B (en) | 2023-09-26 |
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