CN109365123B - Medium box capable of preventing orifice plate from deforming and assembling process thereof - Google Patents
Medium box capable of preventing orifice plate from deforming and assembling process thereof Download PDFInfo
- Publication number
- CN109365123B CN109365123B CN201811271039.1A CN201811271039A CN109365123B CN 109365123 B CN109365123 B CN 109365123B CN 201811271039 A CN201811271039 A CN 201811271039A CN 109365123 B CN109365123 B CN 109365123B
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- Prior art keywords
- plate
- nut
- orifice plate
- screw rod
- screw
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000011148 porous material Substances 0.000 claims description 48
- 125000006850 spacer group Chemical group 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000006148 magnetic separator Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000006246 high-intensity magnetic separator Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/025—High gradient magnetic separators
- B03C1/031—Component parts; Auxiliary operations
Landscapes
- Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a medium box capable of preventing orifice plate deformation and an assembly process thereof, the medium box sequentially comprises a lower top plate, a lower orifice plate, a middle orifice plate, an upper orifice plate and an upper top plate from bottom to top, wherein a plurality of lower spacing rings are arranged between the lower top plate and the lower orifice plate, and a plurality of upper spacing rings are arranged between the upper orifice plate and the upper top plate.
Description
Technical Field
The invention belongs to the technical field of vertical ring high gradient magnetic separators, and particularly relates to a medium box capable of preventing orifice plate deformation and an assembly process thereof.
Background
The medium box is a core component of the vertical ring high gradient magnetic separator, the quality of the medium box directly influences the mineral separation index, and the medium box of the high gradient magnetic separator has the following problems in the production process of a mineral separation plant: in the normal production process of the concentrating mill, the swivel of the vertical-ring high-gradient magnetic separator keeps uniform-speed circular motion, and when 'sundries' fall into the ore pulp tank, the swivel of the high-gradient magnetic separator can be prevented from running. Once the sundries scratch the medium box, the pore plate and the top plate deform, and the medium rods scatter, so that the mineral separation process performance is seriously affected.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a medium box capable of effectively preventing a pore plate from deforming, wherein the pore plate is prevented from deforming partially and a medium rod is prevented from scattering.
Another object of the present invention is to provide a process for assembling a media cassette that is resistant to deformation of an orifice plate.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a prevent medium box of orifice plate deformation, includes down roof, down orifice plate, well orifice plate, goes up the roof in proper order from bottom to top, a long limit department in top of going up the roof is equipped with the otic placode, the bottom of down roof is equipped with down the otic placode and down the otic placode corresponds with last otic placode, edge is equipped with a plurality of screw rods down, the orifice plate is interluded all around and is passed the screw rod setting in down the roof top down, be equipped with a plurality of spacer rings down between roof and the orifice plate down and down the spacer ring all is located one side near down the otic placode, the screw rod is interluded all around and is set up in down the orifice plate top, go up the orifice plate and interlude the screw rod setting in well orifice plate top all around, go up the roof and interlude screw rod setting in last orifice plate top all around, be equipped with a plurality of upper spacer rings and go up the spacer ring all and be located one side near the otic placode between upper orifice plate and the lower ring, it has spacer ring medium bar and spacer ring medium bar's middle part to pass down, in the corresponding spacer hole and the orifice plate.
Further, the bottom of screw rod is equipped with first nut and first nut is located the bottom of roof down, the top of roof is equipped with the second nut with screw rod complex down, the top of orifice plate is equipped with the third nut with screw rod complex down, the bottom of well orifice plate is equipped with the fourth nut with screw rod complex, the top of well orifice plate is equipped with the fifth nut with screw rod complex, the bottom of going up the orifice plate is equipped with the sixth nut with screw rod complex, the top of going up the orifice plate is equipped with the seventh nut with screw rod complex, the top of going up the roof be equipped with screw rod complex eighth nut.
Further, screw thread fastening glue is smeared on the screw rod.
Further, the lower top plate and the upper top plate are rectangular steel plates with a plurality of bolt holes at the peripheral edges.
Further, the lower orifice plate, the middle orifice plate and the upper orifice plate are rectangular steel plates provided with a plurality of through holes, and bolt holes are formed in the peripheral edges of the lower orifice plate, the middle orifice plate and the upper orifice plate.
Further, the number of the upper spacing ring and the lower spacing ring is 5 and the upper spacing ring and the lower spacing ring are corresponding.
Further, the outer diameter of the upper and lower spacer rings is 5.5mm, the inner diameter is 3.3mm, and the height is 4.4mm.
An assembly process of a medium box for preventing orifice plate deformation, comprising the following steps:
A. coating a screw locking glue on the screw rod, and screwing and installing a second nut on the lower part of the screw rod, so that the distance between the lower surface of the second nut and the end face of the lower end of the screw rod is less than or equal to 6mm;
B. The lower end of the screw rod provided with the second nut passes through the lower top plate, and then the first nut is arranged at the lower end of the screw rod and is screwed tightly;
C. fastening the second nut by using a wrench, installing 5 lower spacer rings at one long side edge of the lower top plate, sleeving the lower orifice plate on the screw rod so that the lower orifice plate is horizontally arranged on the second nut, installing a third nut and screwing the third nut;
D. a fourth nut is arranged in the middle of the screw rod, and the plane where the fourth nut is arranged is checked and confirmed to be parallel to the lower orifice plate;
E. sleeving the middle pore plate on a screw rod to enable the middle pore plate to be horizontally arranged on the fourth nut, installing the fifth nut and screwing the fifth nut;
F. a sixth nut is arranged on the upper part of the screw rod, the plane where the sixth nut is arranged is checked and confirmed to be parallel to the middle pore plate, the upper pore plate is sleeved on the screw rod so that the upper pore plate is horizontally arranged on the sixth nut, a seventh nut is arranged, and the seventh nut is screwed;
G. Installing 5 upper spacing rings at one long side of an upper pore plate, enabling 5 spacing ring dielectric rods to sequentially penetrate through the upper spacing rings, the upper pore plate, the middle pore plate, the lower pore plate and the lower spacing rings from top to bottom, enabling the lower ends of the spacing ring dielectric rods to prop against the upper surface of the lower top plate, enabling one dielectric rod to sequentially penetrate through the upper pore plate, the middle pore plate and the lower pore plate from top to bottom, and enabling the lower ends of the dielectric rods to prop against the upper surface of the lower top plate;
H. After the insertion of the dielectric rod is completed, sleeving an upper top plate on the screw rod so that the upper top plate is horizontally placed on the seventh nut, installing an eighth nut on the top of the upper top plate, and screwing the eighth nut;
I. and (3) welding an upper lug plate at the long edge of the top of the upper top plate, and welding a lower lug plate corresponding to the upper lug plate at the bottom of the lower top plate, so that the assembly is finished.
Compared with the prior art, the invention has the following beneficial effects: the invention relates to a medium box capable of preventing orifice plate deformation, which comprises a lower top plate, a lower orifice plate, a middle orifice plate, an upper orifice plate and an upper top plate, wherein a plurality of lower spacing rings are arranged between the lower top plate and the lower orifice plate, a plurality of upper spacing rings are arranged between the upper orifice plate and the upper top plate, the upper spacing rings and the lower spacing rings play a supporting role, when 'blocking' occurs in the process of driving a turntable to operate by a main shaft after ore pulp grooves of a pulsed high-gradient high-intensity magnetic separator enter 'foreign matters', the upper orifice plate and the lower orifice plate are impacted to deform and bend to the upper spacing rings and the lower spacing rings, and the upper spacing rings and the lower spacing rings are stressed to slide to the inner side surfaces of the upper top plate and the lower top plate of the medium box along the axial direction of a medium rod of the spacing rings.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the upper and lower spacer rings of the present invention;
FIG. 3 is a schematic view of the structure of the upper and lower top plates of the present invention;
FIG. 4 is a schematic diagram of the structure of the upper, middle and lower orifice plates of the present invention;
FIG. 5 is a schematic view of the positions of the upper and lower spacer rings of the present invention.
The reference numerals of the invention have the following meanings: 1. a lower top plate; 2. a lower orifice plate; 3. a middle pore plate; 4. an upper orifice plate; 5. an upper top plate; 6. an upper ear plate; 7. a lower ear plate; 8. a screw; 9. a lower spacer ring; 10. an upper spacer ring; 11. a spacer ring dielectric rod; 12. a dielectric rod.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1-5, a medium box for preventing orifice plate deformation sequentially comprises a lower top plate 1, a lower orifice plate 2, a middle orifice plate 3, an upper orifice plate 4 and an upper top plate 5 from bottom to top, wherein the lower top plate 1 and the upper top plate 5 are rectangular steel plates with a plurality of bolt holes at the peripheral edges, the lower orifice plate 2, the middle orifice plate 3 and the upper orifice plate 4 are rectangular steel plates with a plurality of through holes, the peripheral edges of the lower orifice plate 2, the middle orifice plate 3 and the upper orifice plate 4 are provided with bolt holes, an upper lug plate 6 is arranged at one long edge of the top of the upper top plate 5, a lower lug plate 7 is arranged at the bottom of the lower top plate 1 and corresponds to the upper lug plate 6, a plurality of screw rods 8 are arranged at the peripheral edges of the lower top plate 1, screw rods 8 are smeared with screw fastening glue, a first nut is arranged at the bottom end of each screw rod 8 and is positioned at the bottom of the lower top plate 1, a second nut matched with the screw rods 8 is arranged at the top of the lower top plate 1, the lower orifice plate 2 is penetrated through the screw rod 8 around and arranged above the lower top plate 1, the top of the lower orifice plate 2 is provided with a third nut matched with the screw rod 8, 5 lower spacer rings 9 are arranged between the lower top plate 1 and the lower orifice plate 2, the lower spacer rings 9 are all positioned on one side close to the lower ear plate 7, the middle orifice plate 3 is penetrated through the screw rod 8 around and arranged above the lower orifice plate 2, the bottom of the middle orifice plate 3 is provided with a fourth nut matched with the screw rod 8, the top of the middle orifice plate 3 is provided with a fifth nut matched with the screw rod 8, the upper orifice plate 4 is penetrated through the screw rod 8 around and arranged above the middle orifice plate 3, the bottom of the upper orifice plate 4 is provided with a sixth nut matched with the screw rod 8, the top of the upper orifice plate 4 is provided with a seventh nut matched with the screw rod 8, the upper orifice plate 5 is penetrated through the screw rod 8 around and arranged above the upper orifice plate 4, the top of the upper orifice plate 5 is provided with an eighth nut matched with the screw rod 8, 5 upper spacing rings 10 corresponding to the lower spacing rings 9 are arranged between the upper orifice plate 4 and the upper top plate 5, the upper spacing rings 10 are respectively positioned at one side close to the upper ear plate 6, the outer diameters of the upper spacing rings 10 and the lower spacing rings 9 are 5.5mm, the inner diameters of the upper spacing rings 10 and the lower spacing rings 9 are 3.3mm, the heights of the upper spacing rings are 4.4mm, spacing ring medium rods 11 are inserted between the upper spacing rings 10 and the lower spacing rings 9, the middle parts of the spacing ring medium rods 11 penetrate through the middle orifice plate 3, and medium rods 12 are inserted in corresponding through holes of the lower orifice plate 2, the middle orifice plate 3 and the upper orifice plate 4.
The assembly of the medium box for preventing the orifice plate from deforming comprises the following steps:
A. And (3) coating a thread locking adhesive on the screw rod 8, and screwing and installing a second nut on the lower part of the screw rod 8, so that the distance between the lower surface of the second nut and the end face of the lower end of the screw rod 8 is less than or equal to 6mm.
B. the lower end of the screw rod 8 provided with the second nut is provided with the first nut at the lower end of the screw rod 8 after penetrating through the lower top plate 1, and the first nut is screwed.
C. The second nut is fastened by a wrench, 5 lower spacer rings 9 are installed at one long side of the lower top plate 1, and the lower orifice plate 2 is sleeved on the screw rod 8 so that the lower orifice plate 2 is horizontally placed on the second nut, and a third nut is installed and screwed down.
D. a fourth nut is arranged in the middle of the screw rod 8, and the plane where the fourth nut is arranged is checked and confirmed to be parallel to the lower orifice plate 2.
E. the middle pore plate 3 is sleeved on the screw rod 8, so that the middle pore plate 3 is horizontally placed on the fourth nut, the fifth nut is installed, and the fifth nut is screwed.
F. A sixth nut is arranged on the upper portion of the screw rod 8, the plane where the sixth nut is arranged is parallel to the middle pore plate 3 through inspection, the upper pore plate 4 is sleeved on the screw rod 8 so that the upper pore plate 4 is horizontally arranged on the sixth nut, a seventh nut is arranged, and the seventh nut is screwed.
G. The 5 upper spacing rings 10 are arranged at one long side edge of the upper pore plate 4, the 5 spacing ring dielectric rods 11 sequentially penetrate through the upper spacing rings 10, the upper pore plate 4, the middle pore plate 3, the lower pore plate 2 and the lower spacing ring 9 from top to bottom, the lower ends of the spacing ring dielectric rods 11 are propped against the upper surface of the lower top plate 1, and one dielectric rod 12 sequentially penetrates through the upper pore plate 4, the middle pore plate 3 and the lower pore plate 2 from top to bottom, so that the lower ends of the dielectric rods 12 are propped against the upper surface of the lower top plate 1.
H. After the insertion of the dielectric rod 12 is completed, the screw rod 8 is sleeved with the upper top plate 5, so that the upper top plate 5 is horizontally placed on the seventh nut, an eighth nut is installed on the top of the upper top plate 5, and the eighth nut is screwed.
I. An upper lug plate 6 is welded at a long edge of the top of the upper top plate 5, a lower lug plate 7 corresponding to the upper lug plate 6 is welded at the bottom of the lower top plate 1, and the assembly is finished.
Claims (4)
1. A medium box for preventing orifice plate deformation, which is characterized in that: the utility model discloses a lower top plate (1), lower orifice plate (2), well orifice plate (3), go up orifice plate (4), go up roof (5) in proper order from the bottom up, a long limit department in top of going up roof (5) is equipped with down otic placode (6), the bottom of lower roof (1) is equipped with down otic placode (7) and goes up otic placode (6) corresponding, the edge all around of lower roof (1) is equipped with a plurality of screw rods (8), it has screw thread fastening glue to scribble on screw rod (8), screw rod (8) are crossed all around down orifice plate (2) and are set up in lower roof (1) top, be equipped with a plurality of lower spacer rings (9) and all be located one side near down otic placode (7) down between orifice plate (1) and lower orifice plate (2), screw rod (8) are crossed all around to well orifice plate (3) and are crossed screw rod (8) and are set up in lower orifice plate (2) top, screw rod (8) are crossed all around and are crossed screw rod (8) and are set up in well orifice plate (3) top, upper orifice plate (5) are crossed all around, top orifice plate (4) are crossed all around screw rod (5) and are located on one side (4) top of upper side (5) and are located on top of upper side (5) spacer rings (5), the upper spacing rings (10) and the lower spacing rings (9) are 5 and correspond to each other, a spacing ring medium rod (11) is inserted between the upper spacing rings (10) and the lower spacing rings (9) and penetrates through the middle part of the spacing ring medium rod (11), medium rods (12) are inserted in corresponding through holes of the lower pore plate (2), the middle pore plate (3) and the upper pore plate (4), a first nut is arranged at the bottom end of the screw (8) and positioned at the bottom of the lower top plate (1), a second nut matched with the screw (8) is arranged at the top of the lower top plate (1), a third nut matched with the screw (8) is arranged at the top of the lower pore plate (2), a fourth nut matched with the screw (8) is arranged at the bottom of the middle pore plate (3), a fifth nut matched with the screw (8) is arranged at the top of the middle pore plate (3), a sixth nut matched with the screw (8) is arranged at the bottom of the upper pore plate (4), a seventh nut matched with the screw (8) is arranged at the top of the upper pore plate (4), and an eighth nut matched with the screw (8) is arranged at the top of the screw (8); the assembly process comprises the following steps:
A. coating a thread locking adhesive on the screw rod (8), and screwing and installing a second nut on the lower part of the screw rod (8) so that the distance between the lower surface of the second nut and the end face of the lower end of the screw rod (8) is less than or equal to 6mm;
B. the lower end of a screw rod (8) provided with a second nut passes through the lower top plate (1), and then a first nut is arranged at the lower end of the screw rod (8) and is screwed;
C. Fastening the second nut by using a spanner, installing 5 lower spacing rings (9) on one long side edge of the lower top plate (1), sleeving the lower orifice plate (2) on the screw rod (8) so that the lower orifice plate (2) is horizontally arranged on the second nut, installing a third nut and screwing the third nut;
D. a fourth nut is arranged in the middle of the screw (8), and the plane where the fourth nut is arranged is checked and confirmed to be parallel to the lower orifice plate (2);
E. Sleeving the middle pore plate (3) on a screw (8) so that the middle pore plate (3) is horizontally arranged on the fourth nut, installing a fifth nut and screwing the fifth nut;
F. A sixth nut is arranged on the upper part of the screw rod (8), the plane where the sixth nut is arranged is checked and confirmed to be parallel to the middle pore plate (3), the upper pore plate (4) is sleeved on the screw rod (8) so that the upper pore plate (4) is horizontally arranged on the sixth nut, a seventh nut is arranged, and the seventh nut is screwed;
G. 5 upper spacing rings (10) are arranged on one long side edge of an upper pore plate (4), 5 spacing ring dielectric rods (11) sequentially penetrate through the upper spacing rings (10), the upper pore plate (4), a middle pore plate (3), a lower pore plate (2) and a lower spacing ring (9) from top to bottom, so that the lower ends of the spacing ring dielectric rods (11) are propped against the upper surface of a lower top plate (1), and one dielectric rod (12) sequentially penetrates through the upper pore plate (4), the middle pore plate (3) and the lower pore plate (2) from top to bottom, so that the lower ends of the dielectric rods (12) are propped against the upper surface of the lower top plate (1);
H. After the insertion of the dielectric rod (12) is completed, sleeving an upper top plate (5) on the screw (8) so that the upper top plate (5) is horizontally placed on the seventh nut, installing an eighth nut on the top of the upper top plate (5), and screwing the eighth nut;
I. An upper lug plate (6) is welded at one long edge of the top of the upper top plate (5), a lower lug plate (7) corresponding to the upper lug plate (6) is welded at the bottom of the lower top plate (1), and the assembly is finished.
2. A media cassette for preventing deformation of an orifice plate as recited in claim 1, wherein: the lower top plate (1) and the upper top plate (5) are rectangular steel plates with a plurality of bolt holes at the peripheral edges.
3. A media cassette for preventing deformation of an orifice plate as recited in claim 1, wherein: the lower orifice plate (2), the middle orifice plate (3) and the upper orifice plate (4) are rectangular steel plates provided with a plurality of through holes, and bolt holes are formed in the peripheral edges of the lower orifice plate (2), the middle orifice plate (3) and the upper orifice plate (4).
4. A media cassette for preventing deformation of an orifice plate as recited in claim 1, wherein: the outer diameter of the upper spacing ring (10) and the lower spacing ring (9) is 5.5mm, the inner diameter is 3.3mm, and the height is 4.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811271039.1A CN109365123B (en) | 2018-10-29 | 2018-10-29 | Medium box capable of preventing orifice plate from deforming and assembling process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811271039.1A CN109365123B (en) | 2018-10-29 | 2018-10-29 | Medium box capable of preventing orifice plate from deforming and assembling process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109365123A CN109365123A (en) | 2019-02-22 |
| CN109365123B true CN109365123B (en) | 2024-05-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811271039.1A Active CN109365123B (en) | 2018-10-29 | 2018-10-29 | Medium box capable of preventing orifice plate from deforming and assembling process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109365123B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110180676A (en) * | 2019-06-04 | 2019-08-30 | 甘肃酒钢集团西部重工股份有限公司 | A kind of anti-medium rod milling undermines the detachable media case assembly and production method of sideslip |
| CN110292993A (en) * | 2019-06-04 | 2019-10-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of detachable media box framework and its assembly technology |
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| CN203577987U (en) * | 2013-08-08 | 2014-05-07 | 淄博唯能机电科技有限公司 | No-welding medium box swivel device for gradient magnetic field magnetic separator |
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| CN107336751A (en) * | 2017-07-06 | 2017-11-10 | 安徽江山机械有限公司 | A kind of fender structure of absorbable muddy water Impact energy |
| CN107552227A (en) * | 2017-09-27 | 2018-01-09 | 甘肃酒钢集团西部重工股份有限公司 | Strong the magnetomechanical cartridge and its assembly technology of a kind of no-welding |
| CN209362703U (en) * | 2018-10-29 | 2019-09-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of cartridge of anti-orifice plate deformation |
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2018
- 2018-10-29 CN CN201811271039.1A patent/CN109365123B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200987996Y (en) * | 2006-11-03 | 2007-12-12 | 大连金龙建筑机械厂 | High strength medium box for magnetic concentration machine |
| CN103357495A (en) * | 2013-06-27 | 2013-10-23 | 广州粤有研矿物资源科技有限公司 | Assembled magnetic medium box of high-gradient magnetic separator |
| CN203346825U (en) * | 2013-06-27 | 2013-12-18 | 舟山市智海技术开发有限公司 | Double-layer highway buffering anti-collision guardrail |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109365123A (en) | 2019-02-22 |
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