CN116691744B - Bottom door opening and closing mechanism - Google Patents
Bottom door opening and closing mechanismInfo
- Publication number
- CN116691744B CN116691744B CN202310518506.0A CN202310518506A CN116691744B CN 116691744 B CN116691744 B CN 116691744B CN 202310518506 A CN202310518506 A CN 202310518506A CN 116691744 B CN116691744 B CN 116691744B
- Authority
- CN
- China
- Prior art keywords
- main shaft
- bottom door
- door opening
- closing mechanism
- connecting rod
- 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.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D7/00—Hopper cars
- B61D7/02—Hopper cars with discharge openings in the bottoms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D7/00—Hopper cars
- B61D7/14—Adaptations of hopper elements to railways
- B61D7/16—Closure elements for discharge openings
- B61D7/24—Opening or closing means
- B61D7/26—Opening or closing means mechanical
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Closing And Opening Devices For Wings, And Checks For Wings (AREA)
Abstract
The invention provides a bottom door opening and closing mechanism which comprises a bottom door, a main shaft and a connecting rod assembly, wherein the connecting rod assembly is used for connecting the bottom door and the main shaft, the main shaft can rotate under the action of external force and is driven to the connecting rod assembly to open and close the bottom door, a bearing seat is sleeved on the main shaft and can be connected with a vehicle body where the bottom door is located, a shaft shoulder is formed on the main shaft, a safety lock is arranged between the bearing seat and the shaft shoulder, the safety lock comprises a first elastic piece sleeved on the main shaft, and two ends of the first elastic piece are respectively abutted against and extruded with the bearing seat and the shaft shoulder. The invention has the beneficial effects that the self-locking stability of the bottom door of the railway wagon is improved by arranging the safety lock on the main shaft.
Description
Technical Field
The invention relates to the technical field of railway vehicle parts, in particular to a bottom door opening and closing mechanism suitable for a railway wagon.
Background
Railway trucks equipped with bottom door opening and closing mechanisms are becoming increasingly popular for the purpose of saving unloading time and improving unloading efficiency. As a key part of a vehicle, the bottom door opening and closing mechanism is mainly arranged at the bottom of a railway wagon, and when the vehicle runs, the bottom door bears part of the weight of cargoes, and simultaneously can bear huge vibration along with turning and jolting of the vehicle, the bottom door can further transmit the vibration to a main shaft of the bottom door opening and closing mechanism, so that the main shaft can move axially and/or vibrate circumferentially, and along with long-time use of the vehicle, the self-locking property of the main shaft to the bottom door opening and closing mechanism can be influenced, unexpected opening accidents of the bottom door can occur, and the driving safety is influenced. Therefore, the self-locking reliability of the bottom door is ensured, and abnormal door opening of the bottom door caused by factors such as vehicle vibration and the like is prevented.
Therefore, it is necessary to study a bottom door opening and closing mechanism suitable for a railway wagon to solve the above problems or to alleviate the effects of the above problems.
Disclosure of Invention
The invention provides a bottom door opening and closing mechanism which improves the self-locking stability of a bottom door of a railway wagon by arranging a safety lock on a main shaft.
The bottom door opening and closing mechanism can comprise a bottom door, a main shaft and a connecting rod assembly used for connecting the bottom door and the main shaft, wherein the main shaft can rotate under the action of external force and is driven to the connecting rod assembly to open and close the bottom door. The main shaft is sleeved with a bearing seat, the bearing seat can be connected with a car body where the bottom door is located, a shaft shoulder is formed on the main shaft, a safety lock is arranged between the bearing seat and the shaft shoulder, the safety lock comprises a first elastic piece sleeved on the main shaft, and two ends of the first elastic piece are respectively abutted to and extruded with the bearing seat and the shaft shoulder.
In one embodiment, the safety lock may further include a pressing piece sleeved on the spindle and circumferentially fixed to the spindle, wherein one side surface of the pressing piece abuts against one end of the first elastic member, and the other side surface of the pressing piece abuts against the side surface of the bearing seat. The pressing piece and two sides of the bearing seat, which are contacted with each other, are respectively provided with a first groove and a first protrusion which are matched with each other, and the first groove is matched with the first protrusion so that the main shaft is positioned on the bearing seat in the circumferential direction.
In one embodiment, the first groove is V-shaped, the width of the first groove varies along the radial direction of the main shaft, and the groove wall of the first groove smoothly transitions with the side surface of the pressing piece.
In one embodiment, the main shaft is fixedly sleeved with a shaft shoulder sleeve for mounting the pressing piece, the shaft shoulder sleeve and the pressing piece are both annular, a second protrusion is arranged on the outer peripheral surface of the shaft shoulder sleeve, and a second groove corresponding to the second protrusion is arranged on the inner peripheral surface of the pressing piece.
In one embodiment, the safety lock further comprises a fixed baffle plate, an adjusting baffle plate and an adjusting piece, wherein the fixed baffle plate and the adjusting baffle plate are respectively sleeved on the main shaft and are opposite to each other, the adjusting piece is used for adjusting the distance between the fixed baffle plate and the adjusting baffle plate, the fixed baffle plate is fixed at the shaft shoulder of the main shaft, and the adjusting baffle plate is abutted against one end, far away from the bearing seat, of the first elastic piece.
In one embodiment, the fixed baffle plate is provided with a plurality of threaded holes distributed along the circumferential direction, the adjusting baffle plate is provided with counter bores corresponding to the threaded holes one by one, the adjusting piece is provided with external threads matched with the threaded holes, and the adjusting piece is abutted to the counter bores of the adjusting baffle plate through the threaded holes.
In one embodiment, the connecting rod assembly may include a double-link rod and a connecting rod, the middle part of the double-link rod is fixedly sleeved on the main shaft, two ends of the double-link rod are respectively hinged with the connecting rod, and one end of the connecting rod, which is far away from the double-link rod, is hinged with the bottom door.
In one embodiment, the bottom door opening and closing mechanism may further include a touch arm provided at an end of the spindle, and the touch arm may rotate the spindle when touching and relatively moving with a touch table on the ground.
In one embodiment, the two ends of the main shaft are provided with the touch arms, the touch arms are provided with rollers, and the touch arms comprise door opening touch arms and door closing touch arms. The positions of the roller of the door-opening touch arm and the roller of the door-closing touch arm positioned on the same end of the main shaft are staggered in the axial direction and the circumferential direction of the main shaft.
In one embodiment, the bottom door opening and closing mechanism may further include a second elastic member provided at a side of the bottom door orthogonal to the axial direction of the spindle, the second elastic member being for connection with the vehicle body.
Compared with the prior art, the bottom door opening and closing mechanism provided by the invention has at least the following beneficial effects:
according to the bottom door opening and closing mechanism, the safety lock is arranged between the bearing seat and the shaft shoulder of the main shaft, so that the first elastic piece of the safety lock can effectively buffer the axial force applied to the main shaft, the axial displacement change of the main shaft is small, the axial positioning of the main shaft is realized, the axial movement of the main shaft during the running of a vehicle is effectively reduced, and the running safety and the self-locking stability of the bottom door are improved.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.
FIG. 1 is a schematic perspective view of a bottom door opening and closing mechanism according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structural connection of a security lock according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of a bearing housing according to an embodiment of the present invention;
FIG. 4 is a schematic perspective view of a compression plate corresponding to the bearing housing of FIG. 3;
FIG. 5 is a plan view of the hold-down tab of FIG. 4;
FIG. 6 is a schematic perspective view of a shoulder sleeve according to an embodiment of the present invention;
FIG. 7 is a plan view of the shoulder sleeve of FIG. 6;
FIG. 8 is a top view showing the closed state of the bottom door opening and closing mechanism according to the embodiment of the present invention;
fig. 9 is a front view showing a closed state of the bottom door opening and closing mechanism of the embodiment of the present invention;
fig. 10 is a front view of the open state of the bottom door opening and closing mechanism according to the embodiment of the present invention.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
Reference numerals:
The device comprises a 1-bottom door, a 2-main shaft, a 3-bearing seat, a 4-first elastic piece, a 5-pressing piece, a 6-fixed baffle piece, a 7-adjusting baffle piece, an 8-adjusting piece, a 9-first groove, a 10-first bulge, an 11-shoulder sleeve, a 12-second groove, a 13-second bulge, a 14-double link rod, a 15-link rod, a 16-touch arm, a 17-roller, a 18-hanger plate, a 19-support, a 20-second elastic piece and a 21-vehicle body.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1,2 and 8, the bottom door opening and closing mechanism of the present invention may include a bottom door 1, a main shaft 2, and a link assembly for connecting the bottom door 1 and the main shaft 2, wherein the main shaft 2 can be rotated by an external force and is driven to open and close the bottom door 1 by the link assembly. The main shaft 2 is sleeved with the bearing seat 3, the bearing seat 3 can be connected with a vehicle body 21 where the bottom door 1 is located, a shaft shoulder is formed on the main shaft 2, a safety lock is arranged between the bearing seat 3 and the shaft shoulder, the safety lock comprises a first elastic piece 4 sleeved on the main shaft 2, and two ends of the first elastic piece 4 are respectively abutted to and extruded with the bearing seat 3 and the shaft shoulder.
Specifically, the bottom door opening and closing mechanism is applied to a railway wagon, and the bottom door 1 is matched with the wagon body 21 of the railway wagon. The bottom door opening and closing mechanism can adopt a split type structure, namely, the two bottom doors 1 are included, and the connecting rod assembly can simultaneously open the two bottom doors 1 during unloading, so that the width size of unloading of the single bottom door opening and closing mechanism can be effectively increased, and the unloading efficiency is improved. The connecting rod assembly can receive the transmission of the main shaft 2, and realize the opening and closing of the bottom door 1. The main shaft 2 may include a first shaft section having a larger outer diameter in a middle portion and a second shaft section having a smaller outer diameter in both end portions, with a shoulder formed therebetween, and the first shaft section is for connection with the link assembly, and the second shaft section is for mounting the safety lock, the bearing housing 3, and the like. The bearing housing 3 facilitates the rotational connection of the spindle 2 with the vehicle body 21, so that the spindle 2 can be fixed in a radial position while rotating in its own axial direction. The safety lock is arranged between the bearing seat 3 and the shaft shoulder of the main shaft 2, and the safety lock respectively extrudes the bearing seat 3 and the shaft shoulder through the two ends of the first elastic piece 4, so that when the bottom door opening and closing mechanism receives axial force of axial movement along the main shaft 2, the axial force can be effectively buffered through the first elastic piece 4, so that the axial displacement change of the main shaft 2 is small, the axial positioning of the main shaft 2 is realized, the axial movement of the main shaft 2 during running of a vehicle is effectively reduced, and the running safety and the self-locking stability of the bottom door 1 are improved.
As shown in fig. 2 to 5, in an example, the safety lock may further include a pressing piece 5 sleeved on the main shaft 2 and fixed to the main shaft 2 circumferentially, wherein one side surface of the pressing piece 5 abuts against one end of the first elastic member 4, and the other side surface abuts against the side surface of the bearing seat 3. The pressing piece 5 and the bearing seat 3 are respectively provided with a first groove 9 and a first protrusion 10 which are matched with each other on two sides contacted with each other, and the first groove 9 and the first protrusion 10 are matched with each other so that the main shaft 2 can be positioned on the bearing seat 3 at the circumferential limit.
Specifically, the setting of compress tightly piece 5 can be favorable to the biography power between first elastic component 4 and the bearing frame 3 to compress tightly piece 5 under the extrusion of first elastic component 4, compress tightly piece 5 and the corresponding first recess 9 and the first protruding 10 of contact surface on the bearing frame 3 cooperate, make compress tightly piece 5 and bearing frame 3 spacing in the circumference, have certain stability, can offset the moment of torsion that produces main shaft 2 because of the vibration in the goods transportation, in order to realize main shaft 2 circumference location, and then effectively reduce the circumference of main shaft 2 and vibrate when the vehicle is running, improve the stability of driving safety and bottom door 1 auto-lock.
It should be noted that, when the first groove 9 (as shown in fig. 4) is provided on the pressing piece 5, the first protrusion 10 (as shown in fig. 3) is provided on the corresponding bearing seat 3, or when the first protrusion 10 is provided on the pressing piece 5, the first groove 9 is provided on the corresponding bearing seat 3. The number of the first grooves 9 is the same as that of the first protrusions 10, the positions are in one-to-one correspondence, and the shapes and the sizes are matched. The first groove 9 cooperates with the first protrusion 10, i.e. the first protrusion 10 is located in the first groove 9, and when the forces between the two to rotate circumferentially relative to each other are sufficiently large, the first protrusion 10 breaks through the limitation of the first groove 9, so that the pressing piece 5 rotates circumferentially relative to the bearing seat 3. That is, the first grooves 9 and the first protrusions 10 are only arranged to counteract torque generated to the main shaft 2 due to vibration during cargo transportation, and normal opening and closing of the bottom door 1 is not affected. Like this first recess 9 can adopt combined material to make with first protruding 10, can take place deformation to a certain extent, and can resume fast, also can be through the first protruding 10 of bearing frame 3 and the contact of compress tightly piece 5 and first recess 9 design into less size, and all smooth processing, make the frictional force between the two less, and then can not influence the normal switching of bottom door 1. Furthermore, the surface of the pressing piece 5, which is abutted against the first elastic piece 4, is smooth, the friction force is small, and when the pressing piece 5 rotates, the first elastic piece 4 is not driven to synchronously rotate.
As shown in fig. 3 to 5, in one example, the first groove 9 is V-shaped, the width of the first groove 9 varies along the radial direction of the spindle 2, and the groove wall of the first groove 9 smoothly transitions with the side surface of the pressing piece 5, and the structure of the first protrusion 10 is adaptively matched according to the first groove 9. The first recess 9 and the first protrusion 10 may be provided in other suitable structures according to the actual situation, just as a way of the first recess 9 and the first protrusion 10 cooperating to achieve the above-mentioned function.
As shown in fig. 4 to 7, in one example, a shoulder sleeve 11 for mounting the pressing piece 5 is fixedly sleeved on the main shaft 2, the shoulder sleeve 11 and the pressing piece 5 are both annular, a second protrusion 13 is provided on the outer circumferential surface of the shoulder sleeve 11, and a second groove 12 corresponding to the second protrusion 13 is provided on the inner circumferential surface of the pressing piece 5. The second protrusion 13 and the second groove 12 enable the pressing piece 5 and the shoulder sleeve 11 to be fixed in the circumferential direction and relatively movable in the axial direction, and further enable the pressing piece 5 and the main shaft 2 to be fixed in the circumferential direction and relatively movable in the axial direction. It should be noted that the shoulder sleeve 11 has a certain width, so as to prevent the pressing piece 5 from separating from the shoulder sleeve 11 when the spindle 2 and the pressing piece 5 axially move.
As shown in fig. 2, in an example, the safety lock may further include a fixed blocking piece 6 and an adjusting blocking piece 7 that are respectively sleeved on the main shaft 2 and are opposite to each other, and an adjusting piece 8 for adjusting a distance between the fixed blocking piece 6 and the adjusting blocking piece 7, where the fixed blocking piece 6 is fixed at a shaft shoulder of the main shaft 2, and the adjusting blocking piece 7 abuts against one end, away from the bearing seat 3, of the first elastic piece 4.
Specifically, the fixed separation blade 6 and the setting of adjusting separation blade 7 are favorable to first elastic component 4 to pass power with the shaft shoulder of main shaft 2 to the safety lock adjusts the distance between fixed separation blade 6 and the adjusting separation blade 7 through adjusting part 8, adjusts the degree of compressing tightly of first elastic component 4, in order to realize carrying out the regulation of the degree of deformation of extrusion to first elastic component 4. The fixed baffle 6 and the adjusting baffle 7 can be in a circular ring structure, and the inner ring is matched with the main shaft 2 in size. The first elastic member 4 may employ a compression spring.
In one example, the fixed baffle 6 is provided with a plurality of threaded holes distributed along the circumferential direction, the adjusting baffle 7 is provided with counter bores corresponding to the threaded holes one by one, the adjusting piece 8 is provided with external threads matched with the threaded holes, and the adjusting piece 8 is abutted in the counter bores of the adjusting baffle 7 through the threaded holes. In particular, the fixed stop 6 may be a flange and the adjusting member 8 may be an adjusting nut. The distance between the fixed baffle 6 and the adjusting baffle 7 is adjusted by the adjusting piece 8 through the length of the threaded hole, and the lengths of the adjusting pieces 8 through the fixed baffle 6 are consistent, so that the adjusting baffle 7 is prevented from tilting.
As shown in fig. 1 and 8 to 10, in one example, the link assembly may include a double link 14 and a link 15, wherein the middle part of the double link 14 is fixedly sleeved on the main shaft 2, two ends of the double link 14 are respectively hinged with the link 15, and one end of the link 15 away from the double link 14 is hinged with the bottom door 1.
Specifically, the two end structures of the double link rod 14 are central symmetry about the center of the double link rod 14, the double link rod 14 rotates along with the rotation of the main shaft 2 around the axis of the main shaft 2, and one side edge of the bottom door 1 of the general bottom door opening and closing mechanism is hinged with the vehicle body 21, so that the double link rod 14 between the main shaft 2 and the vehicle body 21, the connecting rod 15 and the bottom door 1 form a four-link rod 15 mechanism, the center point of the main shaft 2 can cross a self-locking line formed when the connecting point of the bottom door 1 and the connecting rod 15 and the connecting point of the connecting rod 15 and the double link rod 14 are in a horizontal line in the closing process of the bottom door 1, the mechanism realizes self-locking, namely the bottom door opening and closing mechanism can break through the self-locking dead point by itself, and the self-locking is realized, and the mechanism is safe and reliable. Moreover, the bottom door opening and closing mechanisms all adopt hinged connecting rod assemblies, so that the friction resistance in the opening and closing process of the bottom door 1 is effectively reduced.
As shown in fig. 1 and 2, in one example, the bottom door opening and closing mechanism may further include a touch arm 16 disposed at an end of the main shaft 2, where the touch arm 16 can rotate the main shaft 2 when touching and moving relative to a touch table on the ground.
Specifically, the bottom door opening and closing mechanism obtains stable motion inertia by means of the relative motion of the touch arm 16 and the ground touch table, the mechanism passing position (self-locking dead point) is good in accuracy, the stability of opening and closing the bottom door 1 is improved, the bottom door opening and closing mechanism and the ground touch table are matched to break through the self-locking dead point automatically, self-locking is achieved, and safety and reliability are achieved. The bottom door opening and closing mechanism does not need a wind source, is efficient and energy-saving, and has a simple and economical structure.
In one example, the two ends of the main shaft 2 are provided with touch arms 16, the touch arms 16 are provided with rollers 17, and the touch arms 16 comprise a door opening touch arm and a door closing touch arm. The positions of the roller 17 of the door-opening touching arm and the roller 17 of the door-closing touching arm on the same end of the main shaft 2 are staggered in the axial direction and the circumferential direction of the main shaft 2. Thus, the touch arm 16 adopts a bidirectional touch arm, and can realize bidirectional unloading by matching with a ground touch table, and unloading can be performed while walking, so that unloading efficiency can be improved.
Specifically, when the vehicle runs slowly, the roller 17 on the door opening touch arm at one end is touched on the door opening touch table, the double link rod 14 is driven to rotate clockwise under the slope guiding effect of the door opening touch table, the bottom door opening and closing mechanism breaks the self-locking dead point, the bottom door 1 is opened under the gravity effect of goods, and unloading is started until the goods are unloaded. The vehicle unloads while running the goods, and after the goods is unloaded, the roller 17 on the door closing touch arm at the same end is collided on the door closing touch table at different positions with the door opening touch table, and the double link rod 14 is driven to rotate anticlockwise under the action of the slope guiding force of the door closing touch table, so that the bottom door opening and closing mechanism passes over the self-locking dead point, and self locking is realized. Thus, when two ends of the main shaft 2 are provided with the two-way touch arms, two-way unloading can be realized.
As shown in fig. 1 and 9, in one example, the bottom door opening and closing mechanism may further include a second elastic member 20, the second elastic member 20 being provided on a side of the bottom door 1 orthogonal to the axial direction of the spindle 2, the second elastic member 20 being for connection with the vehicle body 21. The bottom door opening and closing mechanism adds the second elastic piece 20 on the bottom door 1, the self-locking capacity of the bottom door 1 is increased through the pressure of the second elastic piece 20, and the self-locking reliability of the bottom door 1 is improved. The second elastic member 20 may employ a compression spring.
As shown in fig. 1 and 8 to 10, the bottom door opening and closing mechanism may further include a hanger plate 18, one end of the hanger plate 18 is connected to the bearing housing 3, and the other end is connected to the vehicle body 21. The hanger plate 18 is used for fixing the bearing seat 3 and the vehicle body 21, so that the bottom door opening and closing mechanism is stably installed at the bottom of the vehicle body 21, and support is provided for opening and closing actions of the bottom door opening and closing mechanism. The bottom door opening and closing mechanism may further include a support 19, one end of the support 19 is hinged to a side of the bottom door 1 near the main shaft 2, and the other end is connected to the vehicle body 21. The support 19 is used for hinging one side of the bottom door 1 with the vehicle body 21, can provide a key hinging point for the bottom door opening and closing mechanism, is convenient for forming a four-bar linkage 15 mechanism, and can prevent the bottom door 1 from falling when the bottom door 1 is opened.
In summary, the invention can effectively reduce the vibration of the main shaft of the bottom door opening and closing mechanism when the vehicle runs, and improve the running safety and the self-locking stability of the bottom door. The invention has the advantages of no need of wind source, high efficiency, energy saving, simple and economic structure, simple and convenient production and manufacture, simple and easy installation and debugging, quick unloading efficiency, convenient operation, safety and reliability, and can be well adapted to the existing railway freight car.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310518506.0A CN116691744B (en) | 2023-05-09 | 2023-05-09 | Bottom door opening and closing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310518506.0A CN116691744B (en) | 2023-05-09 | 2023-05-09 | Bottom door opening and closing mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116691744A CN116691744A (en) | 2023-09-05 |
| CN116691744B true CN116691744B (en) | 2025-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310518506.0A Active CN116691744B (en) | 2023-05-09 | 2023-05-09 | Bottom door opening and closing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116691744B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103253279A (en) * | 2013-05-20 | 2013-08-21 | 南车长江车辆有限公司 | Bottom door opening and closing system |
| CN203713880U (en) * | 2013-11-15 | 2014-07-16 | 南车长江车辆有限公司 | Second-stage locking device, hopper car bottom door and hopper car |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5584251A (en) * | 1995-07-10 | 1996-12-17 | Keystone Industries, Inc. | Railway car outlet gate assembly with automatic lock |
| CN114148361A (en) * | 2021-12-01 | 2022-03-08 | 中车太原机车车辆有限公司 | Lantern ring structure, hopper car bottom door pin and hopper car bottom door |
-
2023
- 2023-05-09 CN CN202310518506.0A patent/CN116691744B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103253279A (en) * | 2013-05-20 | 2013-08-21 | 南车长江车辆有限公司 | Bottom door opening and closing system |
| CN203713880U (en) * | 2013-11-15 | 2014-07-16 | 南车长江车辆有限公司 | Second-stage locking device, hopper car bottom door and hopper car |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116691744A (en) | 2023-09-05 |
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