CN110641408A - Spring window breaker - Google Patents
Spring window breaker Download PDFInfo
- Publication number
- CN110641408A CN110641408A CN201911007667.3A CN201911007667A CN110641408A CN 110641408 A CN110641408 A CN 110641408A CN 201911007667 A CN201911007667 A CN 201911007667A CN 110641408 A CN110641408 A CN 110641408A
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- Prior art keywords
- rod body
- shell
- window breaker
- hole
- spring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B3/00—Devices or single parts for facilitating escape from buildings or the like, e.g. protection shields, protection screens; Portable devices for preventing smoke penetrating into distinct parts of buildings
Abstract
The invention discloses a spring window breaker, which uses a limit lever to keep the compression state of a compression spring and an impact block, and based on the lever principle, an external force device is used for providing a not very large force for a second rod body, so that the second rod body rotates around a first support, the first rod body can outwards withdraw from a through hole of the limit lever, the limit of the first rod body on the impact block is removed, and after the limit is removed, the impact block rapidly moves towards the glass direction under the action force of the compression spring to break the glass. Therefore, the requirement on a control module except the window breaker is low, the window breaker is easy to trigger for breaking a window, the accuracy and the reliability of the window breaker can be improved, the defect that the traditional spring window breaker is unstable in triggering under emergency is overcome, the limit state of the impact block under huge spring pressure can be easily released by utilizing the lever principle, the possibility that the impact block is locked is effectively reduced, and the device and the method are suitable for various complex environments.
Description
Technical Field
The invention belongs to the technical field of window breakers, and particularly relates to a spring window breaker.
Background
With the development of social economy in China, a traffic trip system is gradually huge, the number of various types of automobiles is increased rapidly, and people can go out conveniently. However, as the number of automobiles increases, traffic accidents caused by various reasons also emerge endlessly, which brings danger to the life and property safety of people.
Modern mass transit vehicles must be equipped with emergency safety devices, of which window breakers are one of the most important. As is known, most of the devices for breaking windows are provided on large-scale operation passenger cars, and most of the devices are safety hammers hung on windows of the windows, which is the most traditional window breaking device, but the biggest disadvantage of the device is that in the case of accidents (such as fire, falling onto a cliff or falling into water), passengers are in panic and cannot rapidly take the window breaking hammer and break the glass correctly and effectively, so that the optimal escape time is missed; in addition, a small number of vehicles are equipped with automatic or semi-automatic window breaking devices, among which window breakers based on spring power are currently common on the market.
Common spring window breakers all rely on the elasticity of spring to provide the energy of beating broken glass, and this elasticity that just needs the spring is enough big, but elasticity is bigger, and the striking piece is because of the high possibility that long-time static pressurized is locked, and the degree of difficulty that just in time and accurate triggered is just bigger under emergency.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the spring window breaker which is easy to trigger for breaking a window and can improve the accuracy and reliability of the window breaker.
In order to solve the technical problems, the invention solves the problems by the following technical scheme:
a spring window breaker comprises a shell and a limiting device, wherein the bottom of the shell is provided with an opening, an impact block and a compression spring are arranged in the shell, one end of the compression spring abuts against the top of the shell, and the other end of the compression spring abuts against the upper end face of the impact block; the limiting device comprises a limiting lever and a first support, the first support is arranged on the outer side wall of the shell, and a limiting lever through hole is formed in the side wall of the shell; the limiting lever comprises a first rod body and a second rod body, and one end of the first rod body is connected with one end of the second rod body to form an L shape; the other end of the first rod body penetrates through the limiting lever through hole and then extends into the shell, the part extending into the shell abuts against the lower end face of the impact block, the second rod body is hinged to the first support, and the second rod body abuts against an external force device;
when the external force device applies external force to the second rod body, the first rod body can be outwards withdrawn along the through hole of the limiting lever.
Further, the both sides of casing bottom are provided with the otic placode, external force device includes that atress changes the piece, sets up boss, the setting of terminal surface are in under the atress changes the piece clamp plate and the second support of atress commentaries on classics piece up end, the second support sets up on the lateral wall of casing, the one end of atress changes the piece with the second support is articulated, the clamp plate is L shape, the one end of clamp plate is fixed atress changes a piece up end, and the other end supports on the second body of rod, the boss with the up end contact of otic placode.
Furthermore, the external force device also comprises an electromagnet, the electromagnet is arranged above the stressed rotating block, and the stressed rotating block is made of magnetic materials.
Furthermore, the limiting device and the external force device are respectively installed on two sides opposite to the shell.
Furthermore, a cover sleeve is further arranged on the side wall of the shell, the bottom of the cover sleeve is in contact with the lug plate, the limiting device and the external force device are arranged in the cover sleeve, and one end of the electromagnet is fixed to the upper portion of the cover sleeve.
Furthermore, a plurality of compression springs are uniformly distributed between the impact block and the top of the shell, and a gap is formed between the impact block and the inside of the shell.
Further, the inner wall of the top of the shell is provided with a cylindrical boss, and the compression spring is sleeved on the cylindrical boss.
Furthermore, the bottom of the shell is connected with a bottom plate, the bottom plate seals the bottom opening of the shell, and a bottom plate through hole is formed in the bottom plate; the lower end face of the impact block is provided with a tip, the tip is arranged opposite to the through hole of the bottom plate, and the tip can extend out of the through hole of the bottom plate.
Further, the diameter of the through hole of the limit lever is far larger than the radial dimension of the first rod body along the through hole of the limit lever.
Further, the limiting lever through hole is positioned on a vertical central line of the side wall of the shell; the hinge point of the second rod body and the first support is far away from the connecting end of the second rod body and the first support, and the length of the connecting end of the second rod body and the first rod body is L1The hinge point of the second rod body and the first support is far away from the other end of the second rod body by the length L2，L1Less than L2。
Compared with the prior art, the invention has at least the following beneficial effects: the invention relates to a spring window breaker, which uses a limit lever to keep the compression state of a compression spring and an impact block, and is based on the lever principle, and an external force device is used for providing a not very large force for a second rod body to rotate around a first support, so that the first rod body can outwards withdraw from a through hole of the limit lever along the second rod body, the limit of the first rod body on the impact block is removed, and after the limit is removed, the impact block rapidly moves towards the glass direction under the action force of the compression spring to break the glass. Therefore, the requirement on a control module except the window breaker is low, the window breaker is easy to trigger for breaking a window, the accuracy and the reliability of the window breaker can be improved, the defect that the traditional spring window breaker is unstable in triggering under emergency is overcome, the limit state of the impact block under huge spring pressure can be easily released by utilizing the lever principle, the possibility that the impact block is locked is effectively reduced, and the device and the method are suitable for various complex environments.
Furthermore, the electromagnet is electrified, an upward acting force is applied to the stressed rotating block by the electromagnet, the stressed rotating block rotates upwards around the second support after being subjected to the upward acting force, the pressing plate further moves towards the direction close to the side wall of the shell, the pressing plate applies pressure to the second rod body, the second rod body rotates around the first support, according to the lever principle, the stressed rotating block can be rotated only by providing a not very large electromagnetic suction force, so that the limited lever is acted to release the impact block, the requirement on a control module outside the window breaker is low, and the manufacturing cost of the whole system can be reduced; in addition, under normal conditions, the impact block also has the effect of force on the limiting lever, and the impact block will react on the stressed rotating block, so that the stressed rotating block is close to the shell ear plate, and the stability of the device can be effectively maintained in the driving process of the automobile.
Furthermore, the two sides of the shell opposite to each other are respectively provided with a limiting device and an external force device, so that the impact block is stressed in balance, the use reliability is ensured, and the service life of the device is prolonged.
Further, the cover sleeve protects the limiting device and the external force device, and the limiting device and the external force device are prevented from being damaged by external factors.
Furthermore, a plurality of compression springs are uniformly distributed between the impact block and the top of the shell, so that the impact block is ensured to have enough impact force to crush the glass, and the uniformly distributed springs ensure that the impact block is stressed in a balanced manner; the striking piece is provided with the clearance with casing inside, avoids taking place the friction between striking piece and the casing, reduces the impact, influences the striking effect.
Furthermore, the inner wall of the top of the shell is provided with a cylindrical boss, the compression spring is sleeved on the cylindrical boss, and the cylindrical boss plays a role in fixing the compression spring.
Further, the bottom of casing is connected with the bottom plate, and the bottom opening of casing is sealed to the bottom plate, and the effect of bottom plate has two: one is used for connecting and fixing, and the shell, the bottom plate and the frame structure of the car window are fixedly connected through the connecting bolt, so that the window breaker is positioned at a position where glass is easy to break; the other one is a safety precaution function, the bottom plate is in compression fit with the bottom of the shell to seal the inner cavity of the shell, a bottom plate through hole is formed in the bottom plate, the top is arranged on the lower end face of the impact block and is opposite to the bottom plate through hole, the top of the impact block can break glass through the bottom plate through hole after the device is triggered, but the impact block cannot pop out of the window breaker due to the existence of the bottom plate, and the accident of accidentally injuring people can be prevented.
Furthermore, the diameter of the through hole of the limiting lever is far larger than the radial size of the first rod body along the through hole of the limiting lever, and the design ensures that the first rod body cannot prop against the hole wall of the through hole of the limiting lever after the device starts.
Furthermore, the through hole of the limiting lever is positioned on the vertical central line of the side wall of the shell, so that the first rod body abuts against the middle position of the impact block, and the stress is uniform; the length of the hinge point of the second rod body and the first support from the connecting end of the second rod body and the first rod body is L1The length of the hinge point of the second rod body and the first support from the other end of the second rod body is L2，L1Less than L2And is more labor-saving.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a perspective view of a spring window breaker of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is an exploded view of the structure of FIG. 1;
FIG. 4 is a front view of FIG. 1;
FIG. 5 is a left side view of FIG. 1;
FIG. 6 is a top view of FIG. 1;
fig. 7 is a bottom view of fig. 1.
In the figure: 1-a bottom plate; 11-a compression spring; 111-fastener piercing; 112-a backplane via; 2-a shell; 21-a threaded through hole; 22-limit lever perforation; 23-square sink tank; 24-ear plate; 25-ear panel fastener perforations; 26-a cylindrical boss; 3-covering the cover; 31-cover fastener perforation; 32-coil wire guide holes; 33-a cylindrical iron core; 4-a limit lever; 41-a first rod; 42-a second rod; 5-a stressed rotating block; 51-a boss; 52-a platen; 6-an electromagnetic coil; 7-a first support; 71-a first cylindrical pin; 8-a second support; 81-a second cylindrical pin; 9-a screw; 10-a strike block; 101-apex; 12-a bolt; 121-a nut; 122-a spacer.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As a specific embodiment of the present invention, referring to fig. 1 to 7, a spring window breaker includes a bottom plate 1, a compression spring 11, a housing 2, an impact block 10, a limit lever 4, a force-receiving rotation block 5 and an electromagnet, as shown in fig. 2 and 3, the housing 2 is rectangular, the bottom of the housing 2 is open, the impact block 10 and the compression spring 11 are installed in the housing 2, the shape of the impact block 10 is the same as the cross-sectional shape of the housing 2, four side walls of the impact block 10 are matched with the inner wall of the housing 2, and a gap is provided between the impact block 10 and the interior of the housing 2, so as to ensure that the impact block 10 can move along the housing 2. The one end of compression spring 11 supports at the top of casing 2, and the other end supports the up end at striking piece 10, and is preferred, and the equipartition is provided with four compression spring 11 between striking piece 10 and the 2 tops of casing, and the top inner wall of casing 2 corresponds fixedly connected with cylinder boss 26, and every compression spring 11 corresponds the cover and establishes on cylinder boss 26, that is to say, the diameter of cylinder boss 26 cooperatees with compression spring 11's internal diameter, and cylinder boss 26 plays fixed action to compression spring 11.
As shown in fig. 1 and 2, two opposite sides of the bottom of the housing 2 are connected with ear plates 24, each ear plate 24 is provided with two ear plate fastener through holes 25, the bottom of the housing 2 is connected with a bottom plate 1, and the bottom plate 1 has two functions: one is used for connecting and fixing, four threaded fastener through holes 111 are formed in the bottom plate 1, and the bolt 12 penetrates through the threaded fastener through holes 111 and the lug plate fastener through holes 25 to fixedly connect the shell 2, the bottom plate 1 and the frame structure of the vehicle window, so that the window breaker is positioned at a position where glass is easy to break; the other is a safety precaution function, the bottom plate 1 is in press fit with the bottom of the shell 2 to seal the inner cavity of the shell, a bottom plate through hole 112 is formed in the center of the bottom plate 1, an apex 101 is arranged on the lower end face of the impact block 10, and the apex 101 is made of hard alloy; the top tip 101 is arranged opposite to the through hole 112 of the bottom plate, and the top tip 101 can extend out of the through hole 112 of the bottom plate. After the device is triggered, the top 101 of the impact block 10 can break glass through the through hole 112 of the bottom plate, but the impact block 10 cannot pop out of the window breaker due to the existence of the bottom plate 1, so that the accident of accidentally injuring people can be prevented.
As shown in fig. 2 and 3, the limiting lever 4 and the first support 7 are respectively installed on the same side of the housing 2 connected with the ear plate 24, specifically, the side wall of the housing 2 is provided with a square sinking groove 23, and the first support 7 is inserted into the square sinking groove 23 and fixed by interference fit. The side wall of the shell 2 is provided with a limiting lever through hole 22, and the limiting lever through hole 22 is positioned on the vertical central line of the side wall of the shell 2. As shown in fig. 2, the limiting lever 4 includes a first rod 41 and a second rod 42, one end of the first rod 41 is connected to one end of the second rod 42 to form an L shape, the other end of the first rod 41 passes through the limiting lever through hole 22 and then extends into the casing 2, and the portion extending into the casing 2 abuts against the lower end surface of the impact block 10, and the second rod 42 is hinged to the first support 7 through a first cylindrical pin 71 to form a rotational connection.
In the invention, the limit lever 4 and the first support 7 form a lever principle, and in order to save labor in operation, the length of the hinge point of the second rod body 42 and the first support 7 from the connecting end of the second rod body 42 and the first rod body 41 is recorded as L1The length of the hinge point of the second rod 42 and the first support 7 from the other end of the second rod 42 is L2Preferably, let L1Less than L2. In order to ensure that the first rod 41 does not abut against the wall of the through hole 22 after the device is started, the diameter of the through hole 22 is much larger than the radial dimension of the first rod 41 along the through hole 22.
As shown in fig. 2 and 3, the second support 8 is further respectively mounted on the same side of the housing 2 connected with the ear plate 24, specifically, a square sinking groove 23 is formed in the side wall of the housing 2, the second support 8 is inserted into the square sinking groove 23 and fixed by interference fit, and the second support 8 is located below the first support 7. As shown in fig. 2, one end of the force-receiving rotary block 5 is hinged to the second support 8 through a second cylindrical pin 81, a boss 51 is disposed on the lower end face of the force-receiving rotary block 5, the boss 51 contacts with the upper end face of the ear plate 24, a pressing plate 52 is fixed on the upper end face of the force-receiving rotary block 5, preferably, the pressing plate 52 is L-shaped, one end of the pressing plate 52 is fixed on the upper end face of the force-receiving rotary block 5, and the other end abuts against the second rod 42. An electromagnet is fixed above the stressed rotating block 5, the electromagnet is formed by matching and fixing an electromagnetic coil 6 and a cylindrical iron core 33 on the inner wall of the cover sleeve 3, the type of the electromagnetic coil 6 is a common copper wire solenoid type, a wire of the coil is connected into an external control circuit through a coil wire hole 32 on the upper wall of the cover sleeve 3 to generate electromagnetic force capable of triggering the device to act on the stressed rotating block 5, and the stressed rotating block 5 is made of magnetic materials, for example, iron.
As shown in fig. 1 and 2, the cover 3 is mounted on the ear plate 24, the trigger device is entirely located in the cover 3, the cover 3 is fixed with the housing 2 by the screw 9, and the cover 3 is in surface contact with the ear plate 24 and the side wall of the housing 2, so that the cover can be completely fixed by only one screw fastener.
The working principle of the invention is as follows: the striking block 10 compresses the compression spring 11 to a proper length and then is clamped by the first rod body 41 penetrating through the limiting lever through hole 22, the triggering state of the striking block 10 is kept, after the striking block 10 is clamped by the first rod body 41, the downward acting force of the compression spring 11 is transmitted to the pressing plate 52 arranged on the stressed rotating block 5 through the second rod body 42, then the stressed rotating block 5 is pressed on the lug plate 24, and the whole triggering device is in a state to be triggered. When the window breaker needs to work in danger, the electromagnet is electrified, the electromagnet provides an upward acting force for the stressed rotating block 5, the stressed rotating block 5 rotates upwards around the second support 8 after receiving the upward acting force, the pressing plate 52 moves towards the direction close to the side wall of the shell 2, the pressing plate 52 applies pressure to the second rod body 42, the second rod body 42 rotates around the first support 7, the first rod body 41 retreats outwards along the limiting lever through hole 22, the limitation of the first rod body 41 on the impact block 10 is removed, after the limitation is removed, the impact block 10 rapidly moves towards the glass direction under the acting force of the compression spring 11, and the tip 101 is punched out from the through hole 112 of the bottom plate to break the glass.
The structure, size and other parameters of the limiting lever 4 and the stressed rotating block 5 in the trigger device are not unique, and the trigger device is not limited to the embodiment and can be designed in appearance to be more attractive and practical. In addition, the detachable first and second holders 7 and 8 may be replaced with a connection portion cast in the housing 2 itself, and the number of the compression springs 11 is not limited to 4. Having thus described the basic principles and principal features of the present invention, and its advantages, the present invention is not limited by the foregoing embodiments, and although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a spring breaks window ware which characterized in that: the device comprises a shell (2) and a limiting device, wherein the bottom of the shell (2) is provided with an opening, an impact block (10) and a compression spring (11) are arranged in the shell (2), one end of the compression spring (11) abuts against the top of the shell (2), and the other end of the compression spring abuts against the upper end face of the impact block (10); the limiting device comprises a limiting lever (4) and a first support (7), the first support (7) is arranged on the outer side wall of the shell (2), and a limiting lever through hole (22) is formed in the side wall of the shell (2); the limiting lever (4) comprises a first rod body (41) and a second rod body (42), and one end of the first rod body (41) is connected with one end of the second rod body (42) to form an L shape; the other end of the first rod body (41) penetrates through the limiting lever through hole (22) and then extends into the shell (2), the part extending into the shell (2) is abutted against the lower end face of the impact block (10), the second rod body (42) is hinged to the first support (7), and the second rod body (42) is abutted against an external force device;
when the external force device applies external force to the second rod body (42), the first rod body (41) can outwards withdraw from the limiting lever through hole (22).
2. The spring window breaker of claim 1, wherein: both sides of casing (2) bottom are provided with otic placode (24), external force device is in including atress commentaries on classics piece (5), setting boss (51), the setting of atress commentaries on classics piece (5) lower terminal surface are in clamp plate (52) and second support (8) of atress commentaries on classics piece (5) up end, second support (8) set up on the lateral wall of casing (2), the one end of atress commentaries on classics piece (5) with second support (8) are articulated, clamp plate (52) are L shape, the one end of clamp plate (52) is fixed atress commentaries on classics piece (5) up end, and the other end supports on the second body of rod (42), boss (51) with the up end contact of otic placode (24).
3. The spring window breaker of claim 2, wherein: the external force device further comprises an electromagnet, the electromagnet is arranged above the stress rotating block (5), and the stress rotating block (5) is made of magnetic materials.
4. A spring window breaker according to claim 3, wherein: the limiting device and the external force device are respectively arranged on two sides opposite to the shell (2).
5. A spring window breaker according to claim 3, wherein: still be provided with on the lateral wall of casing (2) cover (3), the bottom of cover (3) with otic placode (24) contact, stop device with external force device all sets up in cover (3), the one end of electro-magnet is fixed the upper portion of cover (3).
6. The spring window breaker of claim 1, wherein: striking piece (10) with the equipartition is provided with a plurality of between casing (2) top compression spring (11), striking piece (10) with casing (2) inside is provided with the clearance.
7. The spring window breaker of claim 1, wherein: the top inner wall of casing (2) is provided with cylinder boss (26), compression spring (11) cover is established on cylinder boss (26).
8. The spring window breaker of claim 1, wherein: the bottom of the shell (2) is connected with a bottom plate (1), the bottom plate (1) seals the bottom opening of the shell (2), and a bottom plate through hole (112) is formed in the bottom plate (1); the lower end face of the impact block (10) is provided with a tip (101), the tip (101) is arranged opposite to the through hole (112) of the bottom plate, and the tip (101) can extend out of the through hole (112) of the bottom plate.
9. The spring window breaker of claim 1, wherein: the diameter of the limiting lever through hole (22) is far larger than the radial size of the first rod body (41) along the limiting lever through hole (22).
10. The spring window breaker of claim 1, wherein: the limiting lever through hole (22) is positioned on the vertical central line of the side wall of the shell (2); the hinge point of the second rod body (42) and the first support (7) is far away from the connecting end of the second rod body (42) and the first rod body (41) by the length L1The hinge point of the second rod body (42) and the first support (7) is far away from the other end of the second rod body (42) by the length L2，L1Less than L2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911007667.3A CN110641408A (en) | 2019-10-22 | 2019-10-22 | Spring window breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911007667.3A CN110641408A (en) | 2019-10-22 | 2019-10-22 | Spring window breaker |
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| Publication Number | Publication Date |
|---|---|
| CN110641408A true CN110641408A (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911007667.3A Pending CN110641408A (en) | 2019-10-22 | 2019-10-22 | Spring window breaker |
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| CN (1) | CN110641408A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719452A (en) * | 2020-05-27 | 2020-09-29 | 安徽科创生产力促进中心有限公司 | Warning device for high-speed vehicle accident treatment |
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| CN206566367U (en) * | 2017-01-10 | 2017-10-20 | 郑州宇通客车股份有限公司 | A kind of window breaking device and the car using the window breaking device |
| CN109204215A (en) * | 2017-06-29 | 2019-01-15 | 南京理工大学 | There are two types of the window breakers of triggering mode for tool |
| CN211223349U (en) * | 2019-10-22 | 2020-08-11 | 长安大学 | Spring window breaker triggered by trigger |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719452A (en) * | 2020-05-27 | 2020-09-29 | 安徽科创生产力促进中心有限公司 | Warning device for high-speed vehicle accident treatment |
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