CN118422959B - A secondary locking system for lower side doors of universal open wagons - Google Patents
A secondary locking system for lower side doors of universal open wagonsInfo
- Publication number
- CN118422959B CN118422959B CN202410419083.1A CN202410419083A CN118422959B CN 118422959 B CN118422959 B CN 118422959B CN 202410419083 A CN202410419083 A CN 202410419083A CN 118422959 B CN118422959 B CN 118422959B
- Authority
- CN
- China
- Prior art keywords
- lock
- lower side
- diameter
- side door
- diameter section
- 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
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B83/00—Vehicle locks specially adapted for particular types of wing or vehicle
- E05B83/02—Locks for railway freight-cars, freight containers or the like; Locks for the cargo compartments of commercial lorries, trucks or vans
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B85/00—Details of vehicle locks not provided for in groups E05B77/00 - E05B83/00
- E05B85/20—Bolts or detents
Landscapes
- Lock And Its Accessories (AREA)
Abstract
The invention discloses a secondary locking system of a lower side door of a universal open wagon, which comprises a lower side door plate, a lower side door hinge and a hasp assembly, and further comprises a secondary opening prevention device, wherein the secondary opening prevention device comprises a lock seat, a lock pin and a lock iron, the lock seat is bilaterally symmetrical, the left side plate and the right side plate extend forwards to form a lock iron mounting groove, lifting lightening holes and lock iron mounting holes are respectively formed in the upper side and the lower side of the lock iron, the lock pin horizontally penetrates through the lock iron mounting holes and the left side plate and the right side plate of the lock seat so as to mount the lock iron in the lock iron mounting groove, the lock pin comprises a lock pin rotating shaft and a lock pin handle which is mounted at the left end of the lock pin rotating shaft and is in an initial vertical state, the lock pin rotating shaft comprises a thick diameter section 711 with the diameter larger than the diameter of the lock iron mounting hole and a thin diameter section with the diameter matched with the lock iron mounting hole, the distance between the thick diameter section 711 is smaller than the diameter of the thin diameter section, and the front side and the rear side of the lock iron mounting hole are symmetrically provided with limit protrusions, and the advantages of time saving and labor saving, reducing the cost, providing double unlocking guarantee, strict unlocking conditions, good locking effect and the like.
Description
Technical Field
The invention belongs to the technical field of opening prevention of an open wagon bottom side door, and particularly relates to a general open wagon bottom side door secondary locking system.
Background
In the aspect of open wagon application, the action principle of a door hasp for locking a lower side door is a gravity lock principle, when a gap is overlarge due to abrasion of the door hasp and a hinge of the lower side door, under the condition of vibration of a vehicle, a buckling iron can be rotated to open to cause locking failure of the door hasp, meanwhile, the vehicle needs to be unloaded through a dumper in the use process of the open wagon, the vehicle can turn over by 180 degrees, the buckling iron can be rotated to fail in the turning process to cause unexpected opening of the lower side door, the existing solution generally adopts iron wires to bind the lower side door hasp, the lower end of the hinge is prevented from losing limit due to vibration or turning rotation, so that the lower side door of the open wagon is opened, and great potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a secondary locking system of a lower side door of a universal open wagon, which is used for avoiding hidden danger of opening the lower side door of the open wagon and solving the problem of opening failure under specific working conditions such as vibration and overturning of the wagon caused by the existing adoption of a single gravity door locking hasp anti-opening measure.
The technical scheme adopted by the invention is as follows: the utility model provides a general open wagon lower side door secondary locking system, includes the lower side door plant of installing at open wagon side wall outer wall, the bilateral symmetry rotatable installation is folded paper and is installed on open wagon side beam and is used for the hasp subassembly of corresponding lower side door folding paper lower extreme to the bilateral mirror symmetry at open wagon side wall outer wall, still includes the installation on open wagon side beam and the centering secondary anti-open device of corresponding lower side door plant lower extreme, the secondary anti-open device includes lock seat, lockpin and lock iron, lock seat bilateral symmetry and left and right sides board forward extension form lock iron mounting groove, lock iron upper and lower is equipped with respectively and carries weight-reducing hole and lock iron mounting hole, the lock pin horizontally penetrates through the lock iron mounting hole and the left side plate and the right side plate of the lock seat so as to mount the lock iron in the lock iron mounting groove, the lock pin comprises a lock pin rotating shaft and a lock pin handle which is mounted at the left end of the lock pin rotating shaft and is in an initial vertical state, the lock pin rotating shaft comprises a thick diameter section with the diameter larger than the aperture of the lock iron mounting hole and a thin diameter section with the diameter matched with the lock iron mounting hole, planes are symmetrically arranged up and down on the thick diameter section, the distance between the planes is smaller than the diameter of the thin diameter section, and limit protrusions are symmetrically arranged in front of and behind the inner side surface of the lock iron mounting hole so as to form a narrow opening which is specially used for the narrowest part of the thick diameter section to pass through; when the rotary lock pin rotating shaft is rotated to the narrowest position of the thick diameter section and can pass through the narrow opening, unlocking can be realized by translating the lock iron from the thin diameter section to the thick diameter section, lifting the lock iron to pass through the narrow opening and then translating the lock iron back to the thin diameter section to rotate 180 degrees, and when the whole secondary anti-opening device rotates along with a vehicle, locking can be realized by blocking the lock iron from translating and limiting the thin diameter section to pass through the narrow opening through the thick diameter section.
As the scheme is preferable, the narrow opening formed by the limiting protrusion is larger than the narrowest distance between the thick-diameter sections and smaller than the diameter of the thin-diameter sections, so that the narrow opening can only be penetrated by the narrowest part of the thick-diameter sections, the size design is reasonable, the distance between the limiting protrusion and the top surface of the lock iron mounting hole is larger than the diameter of the thick-diameter sections, collision is effectively avoided, and the design size is reasonable.
Further preferably, the diameter of the small diameter section is 21mm, the diameter of the large diameter section is 25mm, the distance between the upper plane and the lower plane is 16mm, the inner width of the lock iron mounting hole is 23mm, the width of a narrow opening formed by the limiting protrusion is 18mm, and the design size meets the requirement.
Further preferably, the distance between the upper half part of the lock iron and the door plate of the lower side door is 10 mm-18 mm, and the door plate of the lower side door can expand outwards in the application process, so that a gap is reserved, and collision damage of the lock iron and the lower side door expanding outwards is avoided.
Further preferably, the lower side door hinge is arranged on the lower side door plate through a hinge seat, the hanging ring is arranged at the lower part of the lower side door hinge, the hasp assembly comprises a hasp seat and a hasp rotatably arranged on the hasp seat, the middle part of the hasp corresponds to the lower side door hinge and is of a semicircular arc-shaped plate-shaped structure, so that the lower end of the lower side door hinge is avoided and buckled, and the structure ring is buckled with each other, and the design is reasonable.
Further preferably, one end of the hasp seat is provided with a rotating shaft for installing the hasp, the other end of the hasp seat is provided with a hasp installation groove, the upper part of the hasp installation groove is provided with a threaded hole and is provided with a stud, when the hasp is rotated to be horizontally lapped on the hasp installation groove along the rotating shaft, the stud can be screwed into the threaded hole to limit the hasp to rotate so as to realize a locking function, and thus, the preliminary anti-opening measure of the lower side door of the open wagon is realized.
Further preferably, the upper corners and the lower corners of the limiting protrusions are provided with chamfers, so that collision with plane corners of the thick diameter end is avoided, and when the thick diameter section enters the narrow opening, the lock iron can be lifted by one hand, the lock pin handle is not required to be held by hands continuously, the operation task amount is reduced, and the design is ingenious.
The invention has the beneficial effects that:
(1) Compared with the prior art that the iron wire is adopted singly to bind the lower side door hasp for preliminary anti-opening measures, the scheme further realizes further anti-opening measures through the secondary anti-opening device, thereby realizing that when the lower side door hasp of the open wagon is totally opened and fails due to vibration or overturning of the wagon body, the lower side door is ensured not to be accidentally opened, the operation safety is greatly improved, the procedure of binding steel wires at the hasp part to enhance the stability is omitted, the time and the labor are saved, and the cost is reduced.
(2) The lock pin is characterized in that the plane is symmetrically arranged on the thick diameter section of the lock pin rotating shaft from top to bottom, the distance between the planes is smaller than the diameter of the thin diameter section, when the lock pin handle is in a vertical state, the plane of the thick diameter section is arranged up and down, therefore, the lock iron is limited on the thin diameter section, the design is reasonable, limiting protrusions are symmetrically arranged on the front side and the back side of the inner side of the lock iron mounting hole, a narrow opening which is specially used for the narrowest part of the thick diameter section to pass through is formed, when the lock pin handle is rotated from the vertical state to the horizontal state, the plane of the lock pin rotating shaft is synchronously rotated to be parallel to the narrow opening, so that unlocking can be realized by translating the lock iron from the thin diameter section to the thick diameter section and lifting the lock iron to pass through the narrow opening and then translating back to the thin diameter section by 180 degrees, unlocking steps are easy to operate, but unlocking conditions are required to meet the translation of the lock iron and move upwards, thus double unlocking guarantee is provided, unlocking conditions are strict, and the structure design is exquisite.
(3) When the vehicle is in a normal running state, the secondary locking device can vibrate, but as the inner diameter of the lock iron mounting hole is larger than the diameter of the small diameter section and smaller than the diameter of the large diameter section, the lock iron can be limited in the small diameter section by the large diameter section, so that the left and right directions of the lock iron are limited, and then as the distance between planes of the large diameter section is smaller than the diameter of the small diameter section, the narrowest part of the large diameter section can only be provided between limiting protrusions, and the small diameter section cannot be passed, so that the upper and lower directions of the lock iron can be limited, and the lock iron and the lock pin keep relatively static all the time under the action of gravity, so that the locking function is realized;
(4) When the vehicle rotates clockwise and anticlockwise on the tipper, the secondary locking device rotates synchronously, but rotates to any angle, the diameter of the small diameter section is larger than the gap between the limiting protrusions, so that the locking iron can be limited at one end of the locking iron mounting hole, even if the locking pin handle is overturned to the plane of the large diameter section to be parallel to the limiting protrusion surface under the action of gravity, the locking iron also needs a transverse force to move to the large diameter section of the locking pin to cause the locking iron to fail, and in the overturning process, the locking pin handle cannot keep a state for a long time due to the influence of gravity, so that the locking iron translation and locking iron up are simultaneously met when the locking iron is overturned, the unlocking condition is very harsh, and the unlocking cannot be completed under the action of external force, so that the locking function can be realized under the overturning working condition of the tipper, and the locking effect is good.
In conclusion, the method has the advantages of time saving, labor saving, cost reduction, double guarantee of unlocking, strict unlocking condition, good locking effect and the like.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a partial enlarged view at a of fig. 1.
Fig. 3 is a front view of the lock iron.
Fig. 4 is a schematic structural view of the lock pin.
Fig. 5 is a schematic structural view of the secondary anti-unlocking device in an unlocked state to rotate the lock pin handle to a horizontal state.
Fig. 6 is a schematic structural view of left translation of the lock iron when the secondary unlocking prevention device is in an unlocking state.
Fig. 7 is a schematic structural view of the lock iron lifting of the secondary unlocking prevention device in the unlocking state.
Fig. 8 is a schematic structural view of the right translation of the lock iron when the secondary unlocking prevention device is in an unlocking state.
Fig. 9 is a schematic structural view of the lock iron rotated 180 ° when the secondary unlocking prevention device is in an unlocking state.
Fig. 10 is a schematic structural view of the secondary anti-unlocking device in an unlocked state to rotate the latch handle to a vertical state.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
Referring to fig. 1-10, a secondary locking system for a lower side door of a general open wagon is composed of a lower side door plate 2 arranged on the outer wall of a side wall 1 of the open wagon, a lower side door hinge 3 which is bilaterally symmetrically and rotatably arranged on the outer wall of the side wall 1 of the open wagon, a hasp assembly 5 which is bilaterally mirror-symmetrically arranged on a side beam 4 of the open wagon and is used for hooping the lower end of the corresponding lower side door hinge 3, and a secondary anti-opening device which is arranged on the side beam 4 of the open wagon and is centered corresponding to the lower end of the lower side door plate 2.
The lower door hinge 3 is mounted on the lower door panel 2 by a hinge seat 31.
A hanging ring 32 is arranged at the lower part of the lower side door hinge 3.
The buckle assembly 5 is composed of a buckle base 51 and a buckle 52 rotatably mounted on the buckle base 51.
The middle part of the hasp 52 is in a semicircular arc-shaped plate-shaped structure corresponding to the lower side door hinge 3, so that the lower end of the lower side door hinge 3 is avoided and buckled.
One end of the buckle seat 51 is provided with a rotating shaft for installing the buckle 52, and the other end is provided with a buckle setting groove.
The upper part of the hasp setting groove is provided with a threaded hole and is provided with a stud.
When the buckle 52 rotates along the rotation axis to be horizontally lapped on the buckle mounting groove, the locking function can be realized by screwing the stud into the threaded hole to limit the rotation of the buckle 52.
The secondary unlocking prevention device consists of a lock seat 6, a lock pin 7 and a lock iron 8.
The lock base 6 is bilaterally symmetrical and the left and right side plates extend forward to form a lock iron seating groove 61.
Lifting lightening holes 82 and locking iron mounting holes 81 are respectively arranged on the upper part and the lower part of the locking iron 8.
The locking pin 7 horizontally passes through the locking iron mounting hole 81 and the left and right side plates of the locking base 6 to thereby mount the locking iron 8 in the locking iron seating groove 61.
The lock pin 7 is composed of a lock pin rotating shaft 71 and a lock pin handle 72 which is installed at the left end of the lock pin rotating shaft 71 and is initially in a vertical state.
The lock pin rotating shaft 71 is composed of a large diameter section 711 with a diameter larger than that of the lock iron mounting hole 81 and a small diameter section 712 with a diameter adapted to the lock iron mounting hole 81.
The thick diameter section 711 is provided with planes symmetrically up and down, and the distance between the planes is smaller than the diameter of the thin diameter section 712.
The inner side of the lock iron mounting hole 81 is provided with limit protrusions 811 symmetrically front and back, thereby forming a narrow opening dedicated to the narrowest part of the thick diameter section 711 to pass through.
The narrow opening width formed by the limit protrusion 811 is larger than the narrowest pitch of the thick-diameter section 711 and smaller than the diameter of the thin-diameter section 712.
The distance between the limit protrusion 811 and the top surface of the lock iron mounting hole 81 is larger than the diameter of the thick-diameter section 711.
And chamfers are arranged at the upper and lower corners of the limit protrusion 811.
The diameter of the small diameter section 712 is preferably 21mm, the diameter of the large diameter section 711 is preferably 25mm, the distance between the upper and lower planes is preferably 16mm, the inner width of the lock iron mounting hole 81 is preferably 23mm, and the width of the narrow opening formed by the limit protrusion 811 is preferably 18mm.
The distance between the upper half part of the lock iron 8 and the lower side door plate 2 is preferably 10 mm-18 mm.
Fig. 5-10 show the unlocking step of the secondary anti-unlocking device, which can be achieved by translating the lock iron 8 from the small diameter section 712 to the large diameter section 711 and lifting it up through the narrow opening and then translating back to the small diameter section 712 for 180 ° rotation when the rotating lock pin shaft 71 is rotated to the narrowest of the large diameter section 711 to pass through the narrow opening.
When the whole secondary opening preventing device rotates along with the vehicle, the large-diameter section 711 can block the translation of the lock iron 8 and the limit protrusion 811 can limit the small-diameter section 712 to pass through the narrow opening to realize locking.
When the vehicle runs, under the action of gravity, the lock pin handle 72 can rotate due to vibration and still keep a vertical downward state due to gravity, but because the inner diameter of the lock iron mounting hole 81 is larger than the diameter of the small diameter section 712 and smaller than the diameter of the large diameter section 711, the lock iron 8 can be limited in the small diameter section 712 by the large diameter section 711, so that the left and right directions of the lock iron 8 are limited, and then, because the distance between planes of the large diameter section 711 is smaller than the diameter of the small diameter section 712, the narrowest part of the large diameter section 711 can only pass through between limiting protrusions 811 and the small diameter section 712 cannot pass through, the upper and lower directions of the lock iron can be limited, and the lock iron and the lock pin can keep relative static under the action of gravity, so that the locking function is realized.
When the vehicle rotates clockwise and anticlockwise on the tipper, the secondary locking device rotates synchronously, but rotates to any angle, the diameter of the small diameter section 712 is larger than the gap between the limit protrusions 811, so that the lock iron 8 can be limited at one end of the installation hole of the lock iron 8, even if the lock pin handle 72 is overturned to the plane of the large diameter section 711 and the plane of the limit protrusions 811 under the action of gravity, the lock iron 8 needs a transverse force to move to the lock pin large diameter section 711 so as to lead the lock iron 8 to fail, and in the overturning process, the lock pin handle 72 cannot keep a state for a long time due to the influence of gravity, so that the translation of the lock iron 8 and the upward movement of the lock iron 8 are simultaneously satisfied when the vehicle is overturned, the unlocking condition is very harsh, and the unlocking cannot be completed under the action of external force, so that the locking function can be realized under the overturning working condition of the tipper.
Claims (7)
1. The utility model provides a general open wagon lower side door secondary locking system, including install in open wagon side wall (1) outer wall lower side door plant (2), bilateral symmetry rotatable mounting in open wagon side wall (1) outer wall lower side door hinge (3) and bilateral mirror symmetry install on open wagon side beam (4) and be used for the hasp subassembly (5) of the lower extreme of corresponding lower side door hinge (3), characterized by still including install on open wagon side beam (4) and the centering correspond lower side door plant (2) lower extreme secondary anti-opening device, secondary anti-opening device includes lock seat (6), lockpin (7) and lockiron (8), lock seat (6) bilateral symmetry and left and right sides board forward extension form lockiron setting groove (61), lockiron (8) upper and lower are equipped with respectively and carry lightening hole (82) and lockiron mounting hole (81), thereby lockpin (7) horizontal cross lockiron mounting hole (81) and lockseat (6) left and right sides board are thereby with lockiron (8) install lockiron (8) in lockseat (6) and centering correspond lower door plant (2) lower extreme, lockpin (71) diameter and diameter of lockpin (71) are installed in pivot section (71) diameter and diameter of lockpin (71) diameter of initial section diameter (71), the locking device is characterized in that planes are arranged vertically symmetrically on the thick-diameter section (711) and the distance between the planes is smaller than the diameter of the thin-diameter section (712), limiting protrusions (811) are symmetrically arranged on the front and rear sides of the inner sides of the locking iron mounting holes (81) so as to form narrow openings which are specially used for the narrowest part of the thick-diameter section (711) to pass through, when the rotating lock pin rotating shaft (71) reaches the narrowest part of the thick-diameter section (711) and can pass through the narrow openings, locking can be achieved by translating the locking iron (8) from the thin-diameter section (712) to the thick-diameter section (711) and lifting the narrow openings and then translating back to the thin-diameter section (712) to rotate 180 degrees, and when the secondary unlocking preventing device integrally rotates along with a vehicle, the translation of the locking iron (8) can be blocked by the thick-diameter section (711) and the limiting protrusions (811) to limit the thin-diameter section (712) to pass through the narrow openings.
2. The secondary locking system of the lower side door of the universal open wagon as set forth in claim 1, wherein the narrow opening width formed by the limit protrusion (811) is larger than the narrowest distance of the thick diameter section (711) and smaller than the diameter of the thin diameter section (712), and the distance between the limit protrusion (811) and the top surface of the locking iron mounting hole (81) is larger than the diameter of the thick diameter section (711).
3. The secondary locking system of a bottom side door of a universal open wagon according to claim 1, wherein the diameter of the small diameter section (712) is 21mm, the diameter of the large diameter section (711) is 25mm, the distance between the upper plane and the lower plane is 16mm, the inner width of the locking iron mounting hole (81) is 23mm, and the narrow opening width formed by the limiting protrusion (811) is 18mm.
4. The secondary locking system of the lower side door of the universal open wagon according to claim 1, wherein the distance between the upper half part of the locking iron (8) and the lower side door plate (2) is 10 mm-18 mm.
5. The secondary locking system of the lower side door of the universal open wagon according to claim 1, wherein the lower side door hinge (3) is hinged on the lower side door plate (2) through a hinge seat (31), a hanging ring (32) is arranged at the lower part of the lower side door hinge (3), the hasp assembly (5) comprises a hasp seat (51) and a hasp (52) rotatably arranged on the hasp seat (51), and the middle part of the hasp (52) is in a semicircular arc-shaped structure corresponding to the lower side door hinge (3) so as to avoid and buckle the lower end of the lower side door hinge (3).
6. The secondary locking system of the lower side door of the universal open wagon according to claim 5, wherein one end of the hasp seat (51) is provided with a rotating shaft for installing the hasp (52), the other end of the hasp seat is provided with a hasp installation groove, the upper part of the hasp installation groove is provided with a threaded hole, and the hasp seat is provided with a stud, and when the hasp (52) rotates to horizontally overlap the hasp installation groove along the rotating shaft, the stud can be screwed into the threaded hole to limit the hasp (52) to rotate to realize a locking function.
7. The secondary locking system of the lower side door of the universal open wagon according to claim 1, wherein the upper corner and the lower corner of the limiting protrusion (811) are provided with chamfers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410419083.1A CN118422959B (en) | 2024-04-09 | 2024-04-09 | A secondary locking system for lower side doors of universal open wagons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410419083.1A CN118422959B (en) | 2024-04-09 | 2024-04-09 | A secondary locking system for lower side doors of universal open wagons |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118422959A CN118422959A (en) | 2024-08-02 |
| CN118422959B true CN118422959B (en) | 2025-09-05 |
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ID=92306101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410419083.1A Active CN118422959B (en) | 2024-04-09 | 2024-04-09 | A secondary locking system for lower side doors of universal open wagons |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118422959B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118309325B (en) * | 2024-04-09 | 2025-09-05 | 中车沈阳机车车辆有限公司 | A universal open car lower side door anti-opening system for railway freight cars |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493723A (en) * | 2011-11-26 | 2012-06-13 | 包头北方创业股份有限公司 | Locking device for bottom side door of railway vehicle |
| AU2014350782A1 (en) * | 2013-11-15 | 2015-07-16 | Crrc Yangtze Co., Ltd. | Link type secondary locking device, hopper car bottom door and hopper car |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397356A (en) * | 2019-08-15 | 2019-11-01 | 瑞安市德乐五金配件有限公司 | A secondary locking bus lock |
| CN211088372U (en) * | 2020-01-19 | 2020-07-24 | 蜂巢能源科技有限公司 | Battery pack and vehicle with it |
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2024
- 2024-04-09 CN CN202410419083.1A patent/CN118422959B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493723A (en) * | 2011-11-26 | 2012-06-13 | 包头北方创业股份有限公司 | Locking device for bottom side door of railway vehicle |
| AU2014350782A1 (en) * | 2013-11-15 | 2015-07-16 | Crrc Yangtze Co., Ltd. | Link type secondary locking device, hopper car bottom door and hopper car |
Also Published As
| Publication number | Publication date |
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| CN118422959A (en) | 2024-08-02 |
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