CN206756411U - Air pump guide rail system vehicle instrument collision checking device - Google Patents
Air pump guide rail system vehicle instrument collision checking device Download PDFInfo
- Publication number
- CN206756411U CN206756411U CN201720138551.3U CN201720138551U CN206756411U CN 206756411 U CN206756411 U CN 206756411U CN 201720138551 U CN201720138551 U CN 201720138551U CN 206756411 U CN206756411 U CN 206756411U
- Authority
- CN
- China
- Prior art keywords
- cylinder body
- sliding block
- guide rail
- optoelectronic switch
- air pump
- 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.)
- Expired - Fee Related
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Abstract
A kind of air pump guide rail system vehicle instrument collision checking device is the utility model is related to, it is characterized in that：Including energy storage ejection module, instrument crash module and signal control module；The energy storage ejection module includes ejection cylinder body, launch in the inner chamber of cylinder body and be coaxially disposed piston and piston rod, the inner chamber for launching cylinder body is separated into ante-chamber and back cavity by piston, and piston rod is stretched out by the front end of ejection cylinder body ante-chamber, and the back cavity for launching cylinder body is connected with air supply system；The instrument crash module includes being fixedly connected with the external part of piston rod along the horizontal fixation sliding block for sliding and setting, fixed sliding block, and test-meter is installed on fixed sliding block；The signal control module includes signal generator, the first optoelectronic switch and the second optoelectronic switch, and the first optoelectronic switch and the second optoelectronic switch are arranged in below fixed sliding block in front and rear.The utility model can the operating mode such as vehicular meter is born in simulated roadway traffic accident power-off and impact, the checking of instrument impact test can be achieved without real train test, experimentation cost is low.
Description
Technical field
A kind of air pump guide rail system vehicle instrument collision checking device is the utility model is related to, belongs to automobile instrument experimental technique
Field.
Background technology
In vehicle travel process, acquisition of the driver for information such as speed, engine speed relies primarily on vehicular meter,
The digital instrument being currently widely used can accurately indicate speed in Current vehicle running, rotating speed number
Value, provides reference, it is ensured that traffic safety for driver.
Generally pass through monitor video, live vestige and vehicle-mounted with speed record function in road traffic accident identification
The travel speed when approach such as electronic equipment are to accident vehicle incident identifies, not yet in view of vehicular meter part, and one
Vehicular meter pointer stuck phenomenon in a little accidents often be present, i.e. speed pointer, rotating speed pointer points to special value, it is contemplated that car
Gauge pointer indicates in running accuracy, if there is ample evidence showing that when accident vehicle gauge pointer is stuck
Indicate travel speed when numerical value is vehicle incident or find both relevances, in being identified for road traffic accident
A new approach is opened up in speed identification.
In view of the above-mentioned problems, the research of some theory analysises thinks that the unexpected power-off of vehicular meter in the course of the work is possible to
The stuck of gauge pointer is caused, when vehicular meter is impacted, its pointer there may be different degrees of shake.The studies above
Only rest on the theoretical supposition stage, and generally all there is power-off and punching for vehicular meter stuck in some road traffic accidents
The operating mode hit, if the result according to theory analysis research, the instruction numerical value when instrument that is hit is stuck will be lost with reference to meaning
Justice.To clear above-mentioned query, it is necessary to design the difference that vehicular meter is born in test battery unit simulation road traffic accident
Operating mode, study its pointer it is stuck when instruction numerical value and actual travel speed between relation, with verify above-mentioned theory analysis grind
Study carefully result, form objective conclusion, the speed identification in being identified for road traffic accident provides reference.
The content of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of air pump guide rail system vehicle instrument
The collision checking operating mode such as device, vehicular meter is born in simulated roadway traffic accident power-off and impact, is tested by actual tests
The theory demonstrate,proved for the stuck problem of gauge pointer speculates, further clears in the case of gauge pointer is stuck in road traffic accident it
Indicate the relation between numerical value and actual vehicle speed.
According to technical scheme provided by the utility model, the air pump guide rail system vehicle instrument collision checking device, it is special
Sign is：Including energy storage ejection module, instrument crash module and signal control module；
Energy storage ejection module includes ejection cylinder body, launches that be coaxially disposed in the inner chamber of cylinder body can be axially movable
The inner chamber for launching cylinder body is separated into ante-chamber and back cavity by piston and piston rod, piston, and piston is fixedly connected with piston rod, piston rod
Stretched out by the front end of ejection cylinder body ante-chamber, the back cavity for launching cylinder body is connected with air supply system, is set on ejection cylinder body back cavity casing wall
Put unloading valve；
The instrument crash module is included along the horizontal fixation sliding block for sliding and setting, the external part of fixed sliding block and piston rod
It is fixedly connected, test-meter is installed on fixed sliding block；
The signal control module includes signal generator, the first optoelectronic switch and the second optoelectronic switch, and the first photoelectricity is opened
Close and the second optoelectronic switch is arranged in below fixed sliding block in front and rear.
Further, the air supply system includes air compressor, gas receiver and control valve, and air compressor passes through gas
Pipeline connects with gas receiver with control valve successively, forms air pressure passageway；After the tail end connection ejection cylinder body of the gas piping
Chamber.
Further, air gauge is set at the control valve.
Further, the fixed sliding block is slidably arranged on line slideway, and line slideway is horizontally disposed.
Further, bottom clamping screw is installed in the bottom of the fixed sliding block, installed on the top of fixed sliding block
Hold clamping screw；The test-meter is realized and fixed by screwing bottom clamping screw and upper end clamping screw.
Further, the head of the bottom clamping screw sets intermediate plate, and intermediate plate is relatively rotated with bottom clamping screw and set
Put and ensure intermediate plate and bottom clamping screw is relatively fixed in length direction.
Further, the first buffer stopper is set on the fixed sliding block, it is fixed on the stand in front of fixed sliding block to connect
Connect the second buffer stopper.
Further, locating piece is set in the line slideway, the position that the locating piece is set is in ejection cylinder for piston
The location of piston rod external part during stop after body；Second optoelectronic switch, the first optoelectronic switch and locating piece are in respectively
It is front and rear to be sequentially arranged.
Further, thrust block is set in the leading section of the ejection cylinder body ante-chamber.
Further, the ejection cylinder body is fixedly connected with stand, and one end of line slideway is fixedly connected with ejection cylinder body,
The other end of line slideway is fixedly connected with stand.
The utility model has advantages below：
（1）The checking of instrument impact test can be achieved without real train test, experimentation cost is low.
（2）By changing air pressure in pipeline, verification experimental verification can be carried out to the automobile instrument collision of different-energy rank.
（3）Experimental rig is compact-sized, and versatility is good, also the expansible impact test applied to other auto parts and components
In.
Brief description of the drawings
Fig. 1 is the structural representation of air pump guide rail system vehicle instrument described in the utility model collision checking device.
Fig. 2 is the fixed sliding block and line slideway assembly relation and optoelectronic switch position schematic diagram.
Fig. 3 is the structural representation of the bottom clamping screw.
Fig. 4 is the operating diagram of air pump guide rail system vehicle instrument described in the utility model collision checking device.
Fig. 4 A are the schematic diagram that unloading valve is in pressure-increasning state.
Fig. 4 B are the schematic diagram that unloading valve is in unloading condition.
Description of reference numerals：1- gas pipings, 2- stands, 3- gas receivers, 4- air compressors, 5- energy storage ejection module,
6- line slideways, 7- instrument crash module, 8- fix sliding block, 9- bottoms clamping screw, 9-1- intermediate plates, 10- signals control module,
The optoelectronic switches of 11- first, the optoelectronic switches of 12- second, the buffer stoppers of 13- second, 14- signal generators, 15- test-meters, on 16-
Hold clamping screw, the buffer stoppers of 17- first, 19- locating pieces, 20- ejection cylinder body, 21- thrust blocks, 22- piston rods, 23- pistons,
24- unloading valves, 25- control valves, 26- air gauges.
Embodiment
With reference to specific accompanying drawing, the utility model is described in further detail.
As shown in figure 1, air pump guide rail system vehicle instrument collision checking device described in the utility model includes energy storage ejection mould
Block 5, instrument crash module 7 and signal control module 10.
The energy storage ejection module 5 includes stand 2, air compressor 4, gas receiver 3, gas piping 1, control valve 25, gas
Press table 26, ejection cylinder body 20, piston 23, piston rod 22, thrust block 21 and unloading valve 24；The air compressor 4 passes through gas
Pipeline 1 connects with gas receiver 3, control valve 25, air gauge 26 successively, forms air pressure passageway, and air compressor 4 passes through gas piping
The back cavity of 1 connection ejection cylinder body 20；The ejection cylinder body 20 is cylindric, and ejection cylinder body 20 is fixedly connected with stand 2, is being launched
Piston 23 and piston rod 22 are coaxially disposed in the inner chamber of cylinder body 20, the inner chamber for launching cylinder body 20 is separated into ante-chamber with after by piston 23
Chamber, piston 23 are fixedly connected with piston rod 22, and piston 23 and piston rod 22 can be in ejection cylinder bodies 20 axially movable, piston
Bar 22 is stretched out by the front end of the ante-chamber of ejection cylinder body 20, and thrust block 21 is set in the leading section of the ejection ante-chamber of cylinder body 20；In the bullet
Penetrate setting unloading valve 24 on the casing wall of the rear end of cylinder body 20.
The instrument crash module 7 includes line slideway 6, locating piece 19, fixed sliding block 8, the first buffer stopper 17, bottom folder
Tight screw rod 9, the buffer stopper 13 of upper end clamping screw 16 and second；The line slideway 6 is horizontally disposed, one end of line slideway 6 with
Ejection cylinder body 20 is fixedly connected, and the other end of line slideway 6 is fixedly connected with stand 2；As shown in Fig. 2 the fixed sliding block 8 with
The external part connection of piston rod 22, and fixed sliding block 8 is slidably arranged on line slideway 6, and fixed sliding block 8 can be led along straight line
Rail 6 slides；Bottom clamping screw 9 is installed in the screw of the fixed bottom of sliding block 8, in the screw on the fixed top of sliding block 8
Upper end clamping screw 16 is installed；Test-meter 15 is placed on the fixed sliding block 8, screws bottom clamping screw 9 and upper respectively
End clamping screw 16 can realize the fixation to test-meter 15.The first buffer stopper of adhesion 17 on the fixed sliding block 8, solid
The second buffer stopper 13 is fixedly connected with the stand 2 in the front of fixed slider 8.
The signal control module 10 includes signal generator 14, the first optoelectronic switch 11 and the second optoelectronic switch 12, the
One optoelectronic switch 11 and the second optoelectronic switch 12 are respectively arranged at the fixed lower section of sliding block 8.The line slideway 6 is by piston rod 22
External part is fixed to position C, position D and position E is sequentially arranged between the second buffer stopper 13 on the line slideway 6 at the C of position
Locating piece 19 is set, and the first optoelectronic switch 11 and the second optoelectronic switch 12 are arranged at position D and position E in front and rear respectively（Such as
Shown in Fig. 4）；The signal generator 14 can be formed with test-meter 15, the first optoelectronic switch 11 and the second optoelectronic switch 12
Signal connects.
As shown in figure 3, the head of the bottom clamping screw 9 sets intermediate plate 9-1, intermediate plate 9-1 and the phase of bottom clamping screw 9
To rotating setting and ensureing that intermediate plate 9-1 and bottom clamping screw 9 are relatively fixed in length direction；Bottom clamping screw 9 screwed
Intermediate plate 9-1 does not rotate in journey, but produces displacement with screwing for bottom clamping screw 9, progressively clamps test-meter 15.
The unloading valve 24 can be at pressure-increasning state and unloading condition, as shown in Figure 4 A, during in pressure-increasning state, unloading valve
24 close, and the ejection back cavity of cylinder body 20 is closed；When as shown in Figure 4 B, in unloading condition, unloading valve 24 is opened, after launching cylinder body 20
Chamber and atmosphere.
The air compressor 4 can produce compressed air and store into gas receiver 3, and control valve 25 can control gas
The UNICOM of air pressure and gas piping 1 and the ejection back cavity of cylinder body 20 in pipeline 1, can need to set gas piping 1 according to experiment
In air pressure.
The ejection ante-chamber of cylinder body 20 and atmosphere, when launching the back cavity of cylinder body 20 and ante-chamber has pressure difference, piston 23
It can be axially moved in the ejection interior edge high pressure of cylinder body 20 to low pressure direction, and then drive the action of piston rod 22 to produce axial thrust,
Fixed sliding block 8 is promoted to be slided along line slideway 6.
, can be respectively to the first optoelectronic switch 11 and the second optoelectronic switch when fixed sliding block 8 is along 6 linear slide of line slideway
12 cause to block, and optoelectronic switch can produce trigger signal under by circumstance of occlusion, wherein the first optoelectronic switch 11 can produce one
Instant trigger signal, the second optoelectronic switch 12 can produce a delayed trigger signal, and time delay can sets itself.
The signal controller 14 can generate satisfactory speed, tach signal, drive the speed pointer of test-meter 15
Special value is pointed to engine speed indicators turn, while the first optoelectronic switch 11 can be received and the second optoelectronic switch 12 produces
Trigger signal, and test-meter 15 is powered off accordingly.
The operation principle of air pump guide rail system vehicle instrument collision checking device described in the utility model：
When checking test starts, test-meter 15 is fixed on fixed sliding block 8, and unloading valve 24 is in pressure-increasning state, fixed
Sliding block 8 is in position C, is contacted with locating piece 19, the dead-centre position after ejection cylinder body 20 of piston 23, it is ensured that now back cavity volume
Minimum, ante-chamber volume is maximum, and signal controller 14 produces analog signal driving test-meter 15 speed, engine speed pointer turns
Move and point to a certain numerical value.
It is later determined that operating condition of test, operating condition of test can be divided into power-off, shock, first power off to hit and first hit afterwards and power off four afterwards
Kind operating mode.
（1）When operating condition of test is powers off, the direct Control experiment instrument 15 of signal generator 14 powers off, testing crew record
The pointer of test-meter 15 indicates numerical value change, off-test.
（2）When operating condition of test is hits, the first optoelectronic switch 11 and the second optoelectronic switch 12 are closed, air
Compressor 4, which starts, to be produced compressed gas and stores into gas receiver 3, after control valve 25 controls gas piping 1 and ejection cylinder body 20
Chamber disconnects, the air pressure in the real-time display gas piping 1 of air gauge 26, and after reaching predetermined pressure, control valve 25 controls gas piping 1
Connected with the ejection back cavity of cylinder body 20, launch cavity pressure moment rise after cylinder body 20, promote the motion compresses of piston 23 ejection cylinder body 20
Ante-chamber, and then drive piston rod 22 to produce axial thrust and promote fixed sliding block 8 along the high-speed slide of line slideway 6, until test instrument
Table 15 contacts generation impact with the second buffer stopper 13, and the pointer of test-meter 15 instruction numerical value becomes during testing crew record experiment
Change, subsequent air compressor 4 is closed, and control valve 25 controls gas piping 1 to be disconnected with ejection cylinder body 20 back cavity, and unloading valve 24 switches
To unloading condition, the ejection back cavity of cylinder body 20 is identical with ante-chamber air pressure, and fixed sliding block 8 is replaced in into position C, off-test.
（3）When operating condition of test hits afterwards first to power off, the first optoelectronic switch 11 is opened, and the second optoelectronic switch 12 is closed,
Air compressor 4, which starts, to be produced compressed gas and stores into gas receiver 3, and control valve 25 controls gas piping 1 and ejection cylinder body
20 back cavities disconnect, the air pressure in the real-time display gas piping 1 of air gauge 26, and after reaching predetermined pressure, control valve 25 controls gas
Pipeline 1 connects with the ejection back cavity of cylinder body 20, launches cavity pressure moment rise after cylinder body 20, promotes the motion compresses of piston 23 ejection cylinder
The ante-chamber of body 20, and then drive piston rod 22 to produce axial thrust and promote fixed sliding block 8 to work as fixation along the high-speed slide of line slideway 6
When sliding block 8 moves to position D, the first optoelectronic switch 11 is blocked, and sends trigger signal to signal generator 14, signal occurs
Control experiment instrument 15 powers off after the reception signal of device 14, and then fixed sliding block 8 continues high-speed slide, until test-meter 15 and the
The contact of two buffer stoppers 13 produces impact, the pointer of test-meter 15 instruction numerical value change during testing crew record experiment, then
Air compressor 4 is closed, and control valve 25 controls gas piping 1 to be disconnected with ejection cylinder body 20 back cavity, and unloading valve 24 switches to off-load
State, the ejection back cavity of cylinder body 20 is identical with ante-chamber air pressure, and fixed sliding block 8 is replaced in into position C, off-test.
（4）When operating condition of test powers off afterwards first to hit, the first optoelectronic switch 11 is closed, and the second optoelectronic switch 12 is opened,
Air compressor 4, which starts, to be produced compressed gas and stores into gas receiver 3, and control valve 25 controls gas piping 1 and ejection cylinder body
20 back cavities disconnect, the air pressure in the real-time display gas piping 1 of air gauge 26, and after reaching predetermined pressure, control valve 25 controls gas
Pipeline 1 connects with the ejection back cavity of cylinder body 20, launches cavity pressure moment rise after cylinder body 20, promotes the motion compresses of piston 23 ejection cylinder
The ante-chamber of body 20, and then drive piston rod 22 to produce axial thrust and promote fixed sliding block 8 to work as fixation along the high-speed slide of line slideway 6
When sliding block 8 moves to position D, test-meter 15 contacted with the second buffer stopper 13 generation impact, while the second optoelectronic switch 12 by
To blocking, certain backward signal generator 14 that postpones sends trigger signal, Control experiment instrument after the reception signal of signal generator 14
Table 15 powers off, and the pointer of test-meter 15 instruction numerical value change, subsequent air compressor 4 close during testing crew record experiment
Close, control valve 25 controls gas piping 1 to be disconnected with ejection cylinder body 20 back cavity, and unloading valve 24 switches to unloading condition, launches cylinder body
20 back cavities are identical with ante-chamber air pressure, and fixed sliding block 8 is replaced in into position C, off-test.
Researcher can be directed to a variety of instruction numerical value, and a variety of impact strengths carry out experiment, the front and rear instrument of statistical analysis experiment
The numerical value of list index instruction, verifies foregoing theory analysis.
The utility model design energy storage ejection module 5 is used to generate and lay in air pressure and be converted into for launching instrument
Ejection force, instrument crash module 7 is set to be used for fixation test instrument 15, while Control experiment instrument 15 is transported at a high speed along assigned direction
Move and collide；The control signal that signal control module 10 exports common instrument is set up, driving gauge pointer rotates, and can mould
Intend being related under collision operating mode control signal output when power-off and impact.Realized jointly by the combined use of above-mentioned disparate modules
Verified for the impact test of the stuck problem of automobile meter pointer.
Claims (10)
1. a kind of air pump guide rail system vehicle instrument collision checking device, it is characterized in that：Module is launched including energy storage（5）, instrument touches
Hit module（7）With signal control module（10）；
Module is launched in the energy storage（5）Including launching cylinder body（20）, launch cylinder body（20）Inner chamber in be coaxially disposed can be along axle
To the piston of motion（23）And piston rod（22）, piston（23）Cylinder body will be launched（20）Inner chamber be separated into ante-chamber and back cavity, it is living
Plug（23）With piston rod（22）It is fixedly connected, piston rod（22）By ejection cylinder body（20）The front end of ante-chamber is stretched out, and launches cylinder body
（20）Back cavity be connected with air supply system, ejection cylinder body（20）Unloading valve is set on back cavity casing wall（24）；
The instrument crash module（7）Including sliding the fixation sliding block set along horizontal（8）, fixed sliding block（8）With piston rod
（22）External part be fixedly connected, in fixed sliding block（8）Upper installation test-meter（15）；
The signal control module（10）Including signal generator（14）, the first optoelectronic switch（11）With the second optoelectronic switch
（12）, the first optoelectronic switch（11）With the second optoelectronic switch（12）Fixed sliding block is arranged in front and rear（8）Lower section.
2. air pump guide rail system vehicle instrument collision checking device as claimed in claim 1, it is characterized in that：The air supply system bag
Include air compressor（4）, gas receiver（3）And control valve（25）, air compressor（4）Pass through gas piping（1）Successively and gas storage
Cylinder（3）And control valve（25）Connection, form air pressure passageway；The gas piping（1）Tail end connection ejection cylinder body（20）After
Chamber.
3. air pump guide rail system vehicle instrument collision checking device as claimed in claim 1, it is characterized in that：In the control valve
（25）Place sets air gauge（26）.
4. air pump guide rail system vehicle instrument collision checking device as claimed in claim 1, it is characterized in that：The fixed sliding block
（8）It is slidably arranged in line slideway（6）On, line slideway（6）It is horizontally disposed.
5. air pump guide rail system vehicle instrument collision checking device as claimed in claim 1, it is characterized in that：In the fixed sliding block
（8）Bottom installation bottom clamping screw（9）, in fixed sliding block（8）Top installation upper end clamping screw（16）；The experiment
Instrument（15）By screwing bottom clamping screw（9）With upper end clamping screw（16）Realize and fix.
6. air pump guide rail system vehicle instrument collision checking device as claimed in claim 5, it is characterized in that：The bottom clamps spiral shell
Bar（9）Head set intermediate plate（9-1）, intermediate plate（9-1）With bottom clamping screw（9）Relatively rotate and set and ensure intermediate plate（9-
1）With bottom clamping screw（9）It is relatively fixed in length direction.
7. air pump guide rail system vehicle instrument collision checking device as claimed in claim 1, it is characterized in that：In the fixed sliding block
（8）The first buffer stopper of upper setting（17）, in fixed sliding block（8）The stand in front（2）On be fixedly connected with the second buffer stopper（13）.
8. air pump guide rail system vehicle instrument collision checking device as claimed in claim 4, it is characterized in that：In the line slideway
（6）Locating piece is set（19）, the locating piece（19）The position of setting is piston（23）In ejection cylinder body（20）Lived afterwards during stop
Stopper rod（22）The location of external part；Second optoelectronic switch（12）, the first optoelectronic switch（11）And locating piece（19）Point
Front and rear it Cheng not be sequentially arranged.
9. air pump guide rail system vehicle instrument collision checking device as claimed in claim 1, it is characterized in that：In the ejection cylinder body
（20）The leading section of ante-chamber sets thrust block（21）.
10. air pump guide rail system vehicle instrument collision checking device as claimed in claim 4, it is characterized in that：The ejection cylinder body
（20）With stand（2）It is fixedly connected, line slideway（6）One end with ejection cylinder body（20）It is fixedly connected, line slideway（6）It is another
One end and stand（2）It is fixedly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720138551.3U CN206756411U (en) | 2017-02-16 | 2017-02-16 | Air pump guide rail system vehicle instrument collision checking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720138551.3U CN206756411U (en) | 2017-02-16 | 2017-02-16 | Air pump guide rail system vehicle instrument collision checking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206756411U true CN206756411U (en) | 2017-12-15 |
Family
ID=60609391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720138551.3U Expired - Fee Related CN206756411U (en) | 2017-02-16 | 2017-02-16 | Air pump guide rail system vehicle instrument collision checking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206756411U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644348A (en) * | 2017-02-16 | 2017-05-10 | 公安部交通管理科学研究所 | Air pump guide rail type vehicle instrument collision validation device |
| CN114878131A (en) * | 2022-07-11 | 2022-08-09 | 江苏金秋竹集团有限公司 | Protective door impact test device |
-
2017
- 2017-02-16 CN CN201720138551.3U patent/CN206756411U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644348A (en) * | 2017-02-16 | 2017-05-10 | 公安部交通管理科学研究所 | Air pump guide rail type vehicle instrument collision validation device |
| CN114878131A (en) * | 2022-07-11 | 2022-08-09 | 江苏金秋竹集团有限公司 | Protective door impact test device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171215 Termination date: 20210216 |