CN110329284B - Sand spreading device for rail transit - Google Patents
Sand spreading device for rail transit Download PDFInfo
- Publication number
- CN110329284B CN110329284B CN201910720089.1A CN201910720089A CN110329284B CN 110329284 B CN110329284 B CN 110329284B CN 201910720089 A CN201910720089 A CN 201910720089A CN 110329284 B CN110329284 B CN 110329284B
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- China
- Prior art keywords
- air passage
- sand
- air
- valve body
- piston
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- 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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- 239000004576 sand Substances 0.000 title claims abstract description 78
- 238000003892 spreading Methods 0.000 title description 4
- 244000035744 Hura crepitans Species 0.000 claims abstract description 33
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 29
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 12
- 238000007599 discharging Methods 0.000 abstract description 6
- 230000007306 turnover Effects 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C15/00—Maintaining or augmenting the starting or braking power by auxiliary devices and measures; Preventing wheel slippage; Controlling distribution of tractive effort between driving wheels
- B61C15/08—Preventing wheel slippage
- B61C15/10—Preventing wheel slippage by depositing sand or like friction increasing materials
- B61C15/102—Preventing wheel slippage by depositing sand or like friction increasing materials with sanding equipment of mechanical or fluid type, e.g. by means of steam
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Nozzles (AREA)
Abstract
The invention relates to the technical field of rail transit, in particular to a sand spraying device for rail transit, which comprises a sand spraying valve body, a valve port, a valve seat, a piston valve body, a piston rod and an elastic resetting piece, wherein the piston rod is fixed with the valve seat so as to drive an opening and closing valve opening of the valve seat, a second air passage used for penetrating the valve seat is arranged in the piston rod, the second air passage is communicated with an air inlet and a first air passage, and when the piston rod drives the valve seat to leave the valve port for a certain distance, the second air passage is communicated so as to blow air to the valve port and the first air passage is communicated so as to blow air to a sand outlet of a sand box. The invention has the advantages that: when the piston rod drives the valve seat to leave the valve port for a certain distance, the second air passage is communicated, air is blown to the valve port, so that the sand flow rate is accelerated, meanwhile, the first air passage is communicated, air is blown to the sand outlet of the sand box, the sand is blown by utilizing the movement of compressed air to turn over, and the sand discharging efficiency is improved while the hardening of the sand is prevented.
Description
Technical Field
The invention relates to the technical field of railway transportation, in particular to a sand spraying device for rail transit.
Background
The sanding device for rail transit is a device for improving the adhesion coefficient between wheel tracks so as to reduce the sliding risk of rail vehicles. At present, the sand box of the domestic sand spraying device is communicated with the atmosphere, moisture reversely enters the sand box through a sand spraying nozzle to increase moisture in the sand box, condensate water is formed in the process of temperature dip, and solidification hardening occurs. Therefore, an important research direction of the sanding device is to prevent sand hardening and improve sand production efficiency.
For this, chinese patent No. CN 107628040B discloses a sand spreader, through setting up air guide pipeline to set up the inlet port on air guide pipeline, can form compressed air in the air guide pipeline, when the sand flow hole was opened, compressed air formed the negative pressure under air guide pipeline's effect, sucked sand grain to the sand outlet of sand flow hole output, in order to improve sand outlet efficiency. Due to the negative pressure effect, the sand conveying speed of the sand spreader can be increased to a certain extent, but the intercommunication between sand and the atmosphere cannot be effectively isolated, and the sand cannot be ensured to be kept in a loose state.
In addition, the prior art document CN 109910924A discloses a hardening prevention sand spraying device for rail transit, wherein the sand spraying device is provided with a stirring device which is inserted into the bottom of a sand box, and wind power or electric power is adopted to enable the sand box to generate a motion effect, so that sand in the sand box is kept in a loose state by the motion, and hardening of the sand is prevented; the sand spreading valve adopts a mechanical locking device, so that moisture is effectively prevented from reversely entering the sand box. In the prior art, the sand is in a loose state in a stirring mode by arranging the stirring device, a mechanical locking device transversely arranged relative to the sand box is adopted, and sand blowing in the sand outlet pipe is controlled by arranging a third air channel of an air inlet of the joint part of the valve base body and the sand outlet pipe.
Disclosure of Invention
Problems to be solved by the invention
The invention provides a sand spreading device for rail transit, which aims to solve the problems that moisture reversely enters a sand box to cause hardening and the sand discharging efficiency is low in the prior art, and improves the sand discharging efficiency while preventing sand from hardening.
Solution for solving the problem
The present invention provides a sanding device for rail transit, comprising:
The sanding valve body is provided with an air inlet;
a valve port fixed to the sanding valve body;
the valve seat is used for opening and closing the valve port;
The piston valve body is provided with a first air passage communicated with the sand outlet of the sand box;
The piston rod is fixed with the valve seat to drive the valve seat to open and close the valve port, a second air passage used for penetrating through the valve seat is arranged in the piston rod, the second air passage is communicated with the air inlet and the first air passage, and when the piston rod drives the valve seat to leave the valve port for a certain distance, the second air passage is communicated to blow air to the valve port and the first air passage is communicated to blow air to the sand outlet of the sand box;
And the elastic reset piece is connected with the piston rod and resets the piston rod.
As a preferred embodiment of the present invention, the piston rod is provided to the piston valve body, and the piston valve body is provided with: the third air passage is communicated with the air inlet; and the fourth air passage is used for communicating or cutting off the third air passage and the second air passage, when the second air passage moves to be matched with the fourth air passage, the third air passage is communicated with the second air passage, and when the second air passage is separated from the fourth air passage, the third air passage is not communicated with the second air passage.
In a preferred embodiment of the present invention, a sealing plate is provided between the sanding valve body and the piston valve body, and the valve port penetrates through the sealing plate and is connected with the sealing plate in a sealing manner.
As a preferable mode of the invention, the end of the first air channel and the end of the fourth air channel are both provided with plugs at the positions communicated with air.
As a preferable mode of the invention, a piston chamber for communicating the second air path and the fourth air path is arranged between the elastic resetting piece and the piston rod, the piston chamber is increased when the air inlet is ventilated so as to drive the elastic resetting piece to lift, and the piston chamber is reduced when the air inlet is not ventilated and is reset through the elastic resetting piece.
As a preferable mode of the invention, a guide belt and a first sealing ring are arranged at the contact part of the elastic reset piece and the piston valve body, a relieving reset spring is arranged in the elastic reset piece, the relieving reset spring is in contact with a spring stop block fixed at the piston valve body, and the relieving reset spring is limited by the spring stop block.
In a preferred mode of the invention, the piston valve body is provided with a hole retainer ring along the top end of the spring stop, and the piston valve body is provided with an O-shaped sealing ring along the side part of the spring stop.
As a preferable mode of the invention, a cavity is arranged between the relieving reset spring and the piston valve body, the piston valve body is provided with a fifth air passage communicated with the cavity, and a respirator is arranged at the position where the fifth air passage is communicated with the atmosphere.
As a preferred mode of the invention, at least one second sealing ring is arranged at the contact position of the piston rod and the piston valve body.
As a preferable mode of the invention, the sanding device comprises an impact seat, wherein the impact seat is arranged on the sanding valve body, and the impact seat is positioned at the bottom of the sand box sand outlet.
As a preferable mode of the invention, a hammer-shaped structure connected with the piston rod is arranged above the piston rod, the hammer-shaped structure is inserted into the sand box, and the piston rod moves and drives the hammer-shaped structure to move in the sand box
Effects of the invention
(1) The sand scattering device adopts a vertical arrangement, namely a piston rod, a valve seat, a valve port and the like form a vertical arrangement mechanical locking structure, and can effectively isolate the intercommunication between sand and the atmosphere, thereby effectively keeping the humidity of air in a sand box;
(2) The air stirring structure is adopted, namely when the piston rod drives the valve seat to leave the valve port for a certain distance, the second air passage is conducted, air is blown to the valve port to accelerate the sand flowing rate, meanwhile, the first air passage is conducted, air is blown to the sand discharging port of the sand box, compressed air is utilized to move and blow to enable sand to turn over, and the sand discharging efficiency is improved while sand hardening is prevented;
(3) The invention adopts the pneumatic control valve with logic control, can isolate the intercommunication between sand and the atmosphere when sand is not scattered, and prevent moisture from entering; in the sanding process, the piston rod is firstly started, sand blowing is carried out, vibration caused by pressure fluctuation of the piston rod is avoided, and clamping stagnation is avoided;
(4) The hammer-shaped structure penetrating into the bottom of the sand box is arranged above the piston rod, sand in the sand box is vibrated, hardening is prevented, and sand discharging efficiency is improved.
Drawings
FIG. 1 is a schematic view of a sanding apparatus in a locked state;
FIG. 2 is a schematic view of the sanding apparatus in a sanded state;
Fig. 3 is a schematic structural view of a sanding apparatus having a hammer-type structure.
Description of the reference numerals
A sanding valve body 1; an air inlet 1-1; a valve port 2; a valve seat 3; a piston valve body 4; a piston rod 5; an elastic restoring member 6; relieving the return spring 6-1; a piston chamber 7; a sealing plate 8; a guide belt 9; a first seal ring 10; a spring stopper 11; a hole retainer ring 12; an O-ring seal 13; a respirator 14; an impact seat 15; a hammer-like structure 16; a second sealing ring 17.
A first air path a; a second air path b; a third air path c; a fourth air path d; and a fifth air path e.
Detailed Description
In the following, the technical solutions according to the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The directional terms appearing in the following description are those directions shown in the drawings and are not meant to be limiting as to the specific structure of the invention. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate by those skilled in the art.
Example 1
For a better understanding of the present invention, a detailed description of the sanding apparatus provided in accordance with embodiments of the present invention is provided below with reference to fig. 1-2.
The present invention provides a sanding device for rail transit, comprising: the sand spraying valve comprises a sand spraying valve body 1, a valve port 2, a valve seat 3, a piston valve body 4, a piston rod 5 and an elastic reset piece 6.
Specifically, the sanding valve body 1 is provided with an air inlet 1-1, and the air inlet 1-1 is used for communicating compressed air. The valve port 2 is fixed on the sanding valve body 1, and the valve port 2 is communicated with the sand outlet. The valve seat 3 is used for opening and closing the valve opening 2, and the valve seat 3 is positioned vertically above the valve opening 2 and can move up and down relative to the valve opening 2 so as to open and close the valve opening 2. The upper part of the sanding valve body 1 is provided with a piston valve body 4, the piston valve body 4 is provided with a first air path a communicated with a sand opening of the sand box, and when the first air path a is communicated, air is blown to the sand opening of the sand box, and the sand is stirred by compressed air.
The piston rod 5 is fixed with the valve seat 3 to drive the valve seat 3 to open and close the valve opening 2, as shown in fig. 1, the piston rod 5, the valve seat 3, the valve opening 2 and the like form a vertically arranged mechanical locking structure, and the intercommunication of sand and the atmosphere can be effectively isolated, so that the humidity of air in the sand box can be effectively maintained. The piston rod 5 is internally provided with a second air passage b which is used for penetrating through the valve seat 3, the second air passage b is communicated with the air inlet 1-1 and the first air passage a, when the piston rod 5 drives the valve seat 3 to leave the valve port 2 for a certain distance, the second air passage b is communicated to blow air to the valve port 2, and the first air passage is communicated a to blow air to the sand outlet of the sand box, so that the sand can be turned over by utilizing the movement of compressed air to blow while the sand flowing rate is accelerated, and the sand hardening is prevented and the sand outlet efficiency is improved. The piston rod 5 is reset by the elastic reset piece 6, and the elastic reset piece 6 is connected with the piston rod 5.
With continued reference to fig. 1, the piston rod 5 is disposed on the piston valve body and can move up and down in the piston valve body, and the piston valve body 5 is further provided with a third air channel c and a fourth air channel d, both of which are located on the left side of the piston rod 5 in fig. 1. The third air path c is communicated with the air inlet 1-1; the fourth air channel d is used for communicating or cutting off the third air channel c and the second air channel b, when the second air channel b moves to be matched with the fourth air channel d, the third air channel c and the second air channel b are communicated and perform sand blowing and stirring, so that the purpose of sand spraying is achieved, and when the second air channel b is separated from the fourth air channel d, the third air channel c and the second air channel b are not communicated, namely in a locking state.
A piston chamber 7 used for communicating the second air path b and the fourth air path d is arranged between the elastic resetting piece 6 and the piston rod 5, the piston chamber 7 is increased when the air inlet 1-1 is ventilated so as to drive the elastic resetting piece 6 to lift, and the piston chamber 7 is reduced when the air inlet 1-1 is not ventilated and is reset and locked through the elastic resetting piece 6. The quick locking and resetting is carried out through the elastic resetting piece 6. Fig. 1 is a schematic structural view of a sanding apparatus in a locked state, and fig. 2 is a schematic structural view of the sanding apparatus in a sanding state. In the process from the locking state of fig. 1 to the sanding state of fig. 2, the piston chamber 7 is enlarged, the elastic reset piece 6 is lifted, and compressed air is blown into the third air passage c, the fourth air passage d, the second air passage b and the first air passage a to accelerate the sand flowing rate and blow stirring sand.
In order to ensure the tightness of air passage control, the sand spraying device is provided with a plurality of sealing positions, and the tail ends of the first air passage a and the fourth air passage d are respectively provided with a plug at the communication position with air. A sealing plate 8 is arranged between the sanding valve body 1 and the piston valve body 4, the valve port 2 penetrates through the sealing plate 8 and is in sealing connection with the sealing plate 8, and the sanding valve body 1 at the valve port 2 and the piston valve body 4 are sealed through the sealing plate 8.
Referring to fig. 1, a plurality of sealing positions are arranged between the piston valve body 4 and the inner structure of the sanding device, a guide belt 9 and a first sealing ring 10 are arranged at the contact position of the piston valve body 4 and the elastic reset piece 6, a relieving reset spring 6-1 is arranged in the elastic reset piece 6, the relieving reset spring 6-1 is contacted with a spring stop block 11 fixed at the piston valve body 4, and the relieving reset spring 6-1 is limited through the spring stop block 11.
The piston valve body 4 is provided with a hole retainer ring 12 along the top end of the spring stop 11, and the piston valve body 4 is provided with an O-shaped sealing ring 13 along the side part of the spring stop 11. A cavity is arranged between the relieving reset spring 6-1 and the piston valve body 4, the piston valve body 4 is provided with a fifth air passage e communicated with the cavity, and a respirator 14 is arranged at the communication part of the fifth air passage e and the atmosphere.
The sealing structure between the piston rod 5 and the piston valve body 4 is that at least one second sealing ring 17 is arranged at the contact position of the piston rod 5 and the piston valve body 4.
The sanding device of the invention further comprises an impact seat 15, wherein the impact seat 15 is arranged on the sanding valve body 1, and the impact seat 15 is positioned at the bottom of a sand opening of the sand box.
Example two
In the second embodiment provided by the invention, the sanding device in the present embodiment is similar to the sanding device in the first embodiment in structure, and only distinguishing features will be described without further description.
Referring to fig. 3, in the sand spraying device of the second embodiment, a hammer-shaped structure 16 connected with the piston rod 5 is arranged above the piston rod 5, the hammer-shaped structure 16 extends into the sand box, and the piston rod 5 moves and drives the hammer-shaped structure 16 to move in the sand box, so that the hardening phenomenon of the sand box after unexpected water inflow can be effectively solved.
The working process of the sanding device of the invention is as follows:
referring to fig. 1, in order to put the sanding device in a locked state, in this state, the valve seat 3 and the valve port 2 are in a locked state, each air passage is non-conductive, and sand cannot enter the sand outlet.
Referring to fig. 2, when starting the sanding operation, the air inlet 1-1 provided by the compressed air sanding valve body 1 enters the third air passage c, and enters the piston rod 5 through the fourth air passage d, and due to the sealing action of the O-shaped sealing ring 13 at the side part of the spring stop block 11 and the second sealing ring 17 of the piston rod 5 in the initial position, the pressure in the piston cavity rapidly rises, the piston rod 5 moves upwards under the action of air pressure, and the piston rod 5 drives the valve seat 3 to open the valve port 2. When the valve port 2 is opened to a certain distance, namely Amm positions, the piston rod 5 rapidly moves to open the full stroke Bmm (B is more than A), the air passage on the piston rod 5 is communicated, two paths of air enter the piston rod 5, namely the second air passage B on the piston rod is communicated, the air is blown to the valve port 2, the first air passage is communicated a, the air is blown to the sand opening of the sand box, and the sand in the cavity is continuously flowed into and supplemented, so that the purpose of sanding is achieved.
Claims (7)
1. A sanding device for rail transit, the sanding device comprising:
A sanding valve body (1) is provided with an air inlet (1-1);
A valve port (2), wherein the valve port (2) is fixed on the sanding valve body (1);
a valve seat (3), wherein the valve seat (3) is used for opening and closing the valve port (2);
the piston valve body (4), the said piston valve body (4) has the first air passage (a) communicated with sand box lower sand port;
The piston rod (5) is fixed with the valve seat (3) so as to drive the valve seat (3) to open and close the valve port (2), a second air passage (b) used for penetrating the valve seat (3) is arranged in the piston rod (5), the second air passage (b) is communicated with the air inlet (1-1) and the first air passage (a), and when the piston rod (5) drives the valve seat (3) to leave the valve port (2) for a certain distance, the second air passage (b) is communicated to blow air to the valve port (2), and the first air passage (a) is communicated to blow air to a sand outlet of the sand box;
the elastic reset piece (6) is connected with the piston rod (5) and resets the piston rod (5);
the piston rod (5) is arranged on the piston valve body (4), and the piston valve body (4) is provided with:
the third air passage (c) is communicated with the air inlet (1-1);
A fourth air passage (d) for communicating or cutting off the third air passage (c) and the second air passage (b), wherein when the second air passage (b) moves to be anastomotic with the fourth air passage (d), the third air passage (c) is communicated with the second air passage (b), and when the second air passage (b) is separated from the fourth air passage (d), the third air passage (c) is not communicated with the second air passage (b);
A piston chamber (7) for communicating the second air path (b) and the fourth air path (d) is arranged between the elastic resetting piece (6) and the piston rod (5), the piston chamber (7) is increased when the air inlet (1-1) is ventilated so as to drive the elastic resetting piece (6) to lift, and the piston chamber (7) is reduced when the air inlet (1-1) is not ventilated and is reset through the elastic resetting piece (6);
The novel hammer type structure is characterized in that a hammer type structure connected with the piston rod is arranged above the piston rod, the hammer type structure penetrates into the sand box, and the piston rod moves and drives the hammer type structure to move in the sand box.
2. A sanding device for rail transit as claimed in claim 1, characterized in that a sealing plate (8) is arranged between the sanding valve body (1) and the piston valve body (4), and the valve port (2) penetrates the sealing plate (8) and is in sealing connection with the sealing plate (8).
3. The sanding device for rail transit as claimed in claim 1, characterized in that the contact of the elastic return element (6) with the piston valve body (4) is provided with a guide belt (9) and a first sealing ring (10), a release return spring (6-1) is arranged in the elastic return element (6), the release return spring (6-1) is in contact with a spring stop block (11) fixed at the piston valve body (4), and the release return spring (6-1) is limited by the spring stop block (11).
4. A sanding device for rail transit as claimed in claim 3, characterized in that the piston valve body (4) is provided with a hole collar (12) along the top end of the spring stopper (11), and the piston valve body (4) is provided with an O-ring (13) along the side of the spring stopper (11).
5. A sanding device for rail transit as claimed in claim 3, characterized in that a cavity is provided between the relief return spring (6-1) and the piston valve body (4), the piston valve body (4) is provided with a fifth air passage (e) communicating with the cavity, and a respirator (14) is provided at the place where the fifth air passage (e) communicates with the atmosphere.
6. Sanding device for rail transit according to claim 1, characterized in that the piston rod (5) is provided with at least one second sealing ring (17) in contact with the piston valve body (4).
7. A sanding apparatus for rail transit as claimed in claim 1, characterized in that it comprises an impact seat (15), said impact seat (15) being mounted to said sanding valve body (1) and said impact seat (15) being located at the bottom of said flask lower port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910720089.1A CN110329284B (en) | 2019-08-06 | 2019-08-06 | Sand spreading device for rail transit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910720089.1A CN110329284B (en) | 2019-08-06 | 2019-08-06 | Sand spreading device for rail transit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110329284A CN110329284A (en) | 2019-10-15 |
| CN110329284B true CN110329284B (en) | 2024-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910720089.1A Active CN110329284B (en) | 2019-08-06 | 2019-08-06 | Sand spreading device for rail transit |
Country Status (1)
| Country | Link |
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| CN (1) | CN110329284B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202213581U (en) * | 2011-01-24 | 2012-05-09 | 武汉铁路安通机车电器配件有限公司 | Vehicle sand-spraying device of railway locomotive |
| CN102943912A (en) * | 2012-11-23 | 2013-02-27 | 蔡光泉 | Signal valve capable of adjusting time |
| CN109910924A (en) * | 2019-04-18 | 2019-06-21 | 华铁西屋法维莱(青岛)交通设备有限公司 | Rail traffic anti-compaction sander |
| CN210363808U (en) * | 2019-08-06 | 2020-04-21 | 华铁西屋法维莱(青岛)交通设备有限公司 | Sanding device for rail transit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0519048U (en) * | 1991-08-24 | 1993-03-09 | 宏 坂本 | Anti-skid sand injection device for vehicles |
| CN201932727U (en) * | 2010-09-26 | 2011-08-17 | 鹤壁市通用机械电气有限公司 | Self-bring arch breaking device of vibration feeder |
| CN202575092U (en) * | 2012-05-30 | 2012-12-05 | 中联重科股份有限公司 | Storage bin and arch breaking device thereof |
| CN202704279U (en) * | 2012-08-23 | 2013-01-30 | 葛洲坝集团第五工程有限公司 | Discharging device of silo type roller-compacted sand storage hopper |
| CN208813187U (en) * | 2018-08-28 | 2019-05-03 | 上海国之鼎铁路机电有限公司 | Rail traffic gravity type sanding valve |
-
2019
- 2019-08-06 CN CN201910720089.1A patent/CN110329284B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202213581U (en) * | 2011-01-24 | 2012-05-09 | 武汉铁路安通机车电器配件有限公司 | Vehicle sand-spraying device of railway locomotive |
| CN102943912A (en) * | 2012-11-23 | 2013-02-27 | 蔡光泉 | Signal valve capable of adjusting time |
| CN109910924A (en) * | 2019-04-18 | 2019-06-21 | 华铁西屋法维莱(青岛)交通设备有限公司 | Rail traffic anti-compaction sander |
| CN210363808U (en) * | 2019-08-06 | 2020-04-21 | 华铁西屋法维莱(青岛)交通设备有限公司 | Sanding device for rail transit |
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| CN110329284A (en) | 2019-10-15 |
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