CN207773290U - The anti-turning-up devices of semitrailer active - Google Patents
The anti-turning-up devices of semitrailer active Download PDFInfo
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- CN207773290U CN207773290U CN201820116083.4U CN201820116083U CN207773290U CN 207773290 U CN207773290 U CN 207773290U CN 201820116083 U CN201820116083 U CN 201820116083U CN 207773290 U CN207773290 U CN 207773290U
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Abstract
The utility model discloses a kind of anti-turning-up devices of semitrailer active, include four sets of hydraulic cylinders mounted on vehicle frame both sides, acceleration transducer, angular displacement sensor, synchronization hydraulic system and electric-control system, the acceleration transducer is for detecting the transverse acceleration of semitrailer in the process of moving, angular displacement sensor is used to detect the controllable angle in compartment, acceleration transducer and angular displacement sensor signal output end are connect with electric-control system signal input part, electric-control system signal output end connects synchronization hydraulic system control terminal, four sets of hydraulic cylinders are rectangular to be distributed in rear in compartment, the piston rod top of four sets of hydraulic cylinders is hinged with container bottom, the cylinder body tail end of four sets of hydraulic cylinders is hinged with vehicle frame；It detects the transverse acceleration threshold value of vehicle by acceleration transducer, then it is mainly turned on one's side from control system control Hydraulic Cylinder and is partly rotated to anti-obliquity direction, and then the rollover limit acceleration of vehicle itself is improved, play the role of actively preventing turning over, adapts to different operating modes.
Description
Technical field
The utility model is related to semitrailer technical field more particularly to a kind of anti-turning-up devices of semitrailer active.
Background technology
Semitrailer is that axle is placed in vehicle's center of gravity（When the uniform stand under load of vehicle）Below, and equipped with can will be horizontal and vertical
Power is transmitted to the trailer of the hookup of tractor.Semitrailer is usually three axis semitrailers, and type is divided into 11 rice barn columns half
Trailer, 13 rice barn columns, a lot of types such as low flat bed semi trailer.It is a kind of heavy type being connected with semi-mounted headstock by towing pin
Transport vehicle.
Storehouse grating semitrailer loading position uses the semitrailer of fence structure design.It is mainly used for agricultural and sideline product and other is light
The transport of bulky cargo object.1, vehicle and fence structure design technology combination user's series of lot rationally design, meet under load condition
Fully mitigate carriage weight, simple in structure to be applicable in, convenient disassembly reduces cost of investment for user, creates more profit values.
2, vehicle frame：The space frame structure made of longeron and whole penetration type crossbeam group weldering.Can the intensity of balanced vehicle frame, rigidity,
Toughness, bearing capacity is strong, is not permanently deformed.3, serial storehouse grating semi-trailing car frame is to wear girder structure, and longeron is using flat
Straight or gooseneck type.For web height from 400 to 500, longeron uses adopting automatic submerged arc welding, vehicle frame to use Shot Blasting, crossbeam
It penetrates longeron and welds entirety.4, suspension system：Using novel suspension system, intensity is high, and impact resistance is strong；Each axis axle load
Balance, system pull rod angle rationally design, during operation is frequently jolted, reduce the frictional slip on tire and ground away from
From effectively reducing tire wear, while adjustable drawbar, adjustable axle base effectively avoids the eccentric wear of tire from closing and gnaws wheel phenomenon.
But since semitrailer has centroid position high, quality and volume big, wheelspan is narrow relative to bodywork height, after
The features such as portion's motion amplification, and there is complicated coupled relation between tractor and semitrailer, cause in driving process easily
The dangerous working conditions such as shimmy, rollover and folding occur, for this purpose, mainly improving the rollover of vehicle using following system both at home and abroad at present
Stability：It rolls warning device, electric control system, roll stable control system, roll support system and axle low damage control
System processed etc., above-mentioned apparatus and system are the speeds or semitrailer transverse acceleration detected by electronic test equipment when turning
Threshold value turns in the output torque and axle for controlling engine by control system, vehicle rollover stability is improved to reach
Purpose, but belong to passive anti-turning-up devices, the stability of vehicle can only be adjusted in the intrinsic rollover limit of semitrailer
Section, adjustable range are limited.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of anti-turning-up devices of semitrailer active, pass through acceleration
Then the transverse acceleration threshold value of sensor detected vehicle is mainly turned on one's side from control system control Hydraulic Cylinder and is partly inclined to counter
Tilted direction rotates, and then improves the rollover limit acceleration of vehicle itself, plays the role of actively preventing turning over, and adjustable range is larger,
Adapt to different operating modes.
In order to solve the above technical problems, technical solution adopted in the utility model is：A kind of semitrailer is actively anti-to be turned
It sets, includes four sets of hydraulic cylinders, acceleration transducer, angular displacement sensor, synchronization hydraulic system and the electricity mounted on vehicle frame both sides
Control system, the acceleration transducer are used for detecting the transverse acceleration of semitrailer in the process of moving, angular displacement sensor
Controllable angle in detection compartment, acceleration transducer and angular displacement sensor signal output end connect with electric-control system signal input part
It connecing, electric-control system signal output end connects synchronization hydraulic system control terminal, and four sets of hydraulic cylinders are rectangular to be distributed in rear in compartment,
The piston rod top of four sets of hydraulic cylinders is hinged with container bottom, and the cylinder body tail end and vehicle frame of four sets of hydraulic cylinders are hinged.
The electric-control system includes microcontroller, acceleration detection module, controllable angle detection module, A/D conversion modules, driving
Circuit, proportion electro-magnet, acceleration display panel and danger detector, the acceleration transducer pass through acceleration detection module
Single-chip microcomputer signal input terminal is connected with A/D conversion modules, the angular displacement sensor is converted by Angular Displacement Detecting module and A/D
Module connects single-chip microcomputer signal input terminal, and single-chip microcomputer signal output end controls proportion electro-magnet by driving circuit, and acceleration is aobvious
Show panel and danger detector and single chip communication.
The acceleration detection module and controllable angle detection module are power amplification circuit, use three amplifiers
MC33274 constitutes power amplification circuit, and for differential input to be become Single-end output, output end connects A/D conversion modules.
The driving circuit includes triangular wave Signal generator of vibration, initial current initialization circuit and power amplification circuit,
Triangular wave Signal generator of vibration is for realizing the adjustment of frequency and amplitude, and initial current initialization circuit is for adjusting proportionality velocity modulation
The zero-bit dead zone size of valve avoids dead zone.
The microcontroller is AT89C51 microcontrollers, and acceleration display panel uses 4 seven segment digital tubes, and microcontroller is to solve
Code device SN74LSN chips are connect as interface with the interface of 4 seven segment digital tubes.
The synchronization hydraulic system include hydraulic pump, filter, unloading valve, the first three position four-way directional control valve, the two or three
Four-way reversing valve, the first ratio one-way speed-regulating valve, the second ratio one-way speed-regulating valve, the first flow divider, the second flow divider, the first liquid
Control check valve, the second hydraulic control one-way valve, third hydraulic control one-way valve, the 4th hydraulic control one-way valve, first hydraulic cylinder, second hydraulic cylinder,
Third hydraulic cylinder, the 4th hydraulic cylinder, first pressure recuperation valve and second pressure recuperation valve, first hydraulic cylinder and second hydraulic cylinder point
Not An Zhuan the first hinge joint of loading space both sides, third hydraulic cylinder and the 4th hydraulic cylinder are separately mounted to the second hinge joint of loading space two
Side, hydraulic pump outlet end install filter, hydraulic pump outlet end by hydraulic tube be separately connected the first three position four-way directional control valve and
The A mouths at the ends P of the second three position four-way directional control valve, the first three position four-way directional control valve connect first by the first ratio one-way speed-regulating valve
Flow divider, the first flow divider outlet end connect first hydraulic cylinder and third by the first hydraulic control one-way valve with third hydraulic control one-way valve
The rodless cavity of hydraulic cylinder, the B mouths of the first three position four-way directional control valve connect first hydraulic cylinder and second hydraulic cylinder by hydraulic tube
Rod chamber, the second A mouthfuls of three position four-way directional control valve connect the second flow divider by the second ratio one-way speed-regulating valve, and the second flow divider goes out
Mouthful end connects the rodless cavity of second hydraulic cylinder and the 4th hydraulic cylinder by the second hydraulic control one-way valve and the 4th hydraulic control one-way valve, and second
B mouthfuls of rod chambers that second hydraulic cylinder and the 4th hydraulic cylinder are connected by hydraulic tube of three position four-way directional control valve.
The first ratio one-way speed-regulating valve and the second ratio one-way speed-regulating valve structure are identical, the first ratio one-way speed-regulating valve
Including the first pressure recuperation valve and the first check valve being set up in parallel, the second ratio one-way speed-regulating valve includes first be set up in parallel
Pressure-compensated valve and the second check valve.
It is using advantageous effect caused by above-mentioned technical proposal：It detects the transverse direction of vehicle by acceleration transducer
Then acceleration rate threshold is mainly turned on one's side part to the rotation of anti-obliquity direction from control system control Hydraulic Cylinder, and then is improved
The rollover limit acceleration of vehicle itself plays the role of actively preventing turning over, and adjustable range is larger, adapts to different operating modes, effectively anti-
The only rollover in vehicle travel process, it is ensured that driving safety；Still further aspect, the control system of the utility model is with AT89C51
Microcontroller is core, by the flow area of control ratio one-way speed-regulating valve, realizes the control to four sets of hydraulic cylinder output speeds,
It shows with acceleration, the functions such as lateral deceleration detection, controllable angle inspection, danger warning.
Description of the drawings
Fig. 1 is the principles of the present invention block diagram；
Fig. 2 is synchronization hydraulic system schematic diagram；
Fig. 3 is sensor interface circuitry schematic diagram；
Fig. 4 is acceleration display panel interface circuit figure；
Fig. 5 is driver circuit schematic diagram；
Wherein：1, hydraulic pump；2, filter；3, unloading valve；4, the first three position four-way directional control valve；5, the second 3-position 4-way changes
To valve；6, the first ratio one-way speed-regulating valve；7, the second ratio one-way speed-regulating valve；8, the first flow divider；9, the second flow divider；10、
First hydraulic control one-way valve；11, the second hydraulic control one-way valve；12, third hydraulic control one-way valve；13, the 4th hydraulic control one-way valve；14, first
Hydraulic cylinder；15, second hydraulic cylinder；16, third hydraulic cylinder；17, the 4th hydraulic cylinder；18, loading space；20, first pressure recuperation valve；
21, second pressure recuperation valve.
Specific implementation mode
With reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that and described embodiment is only a part of the embodiment of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Many details are elaborated in the following description in order to fully understand the utility model, but this practicality is new
Type can also be implemented using other different from other manner described here, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of novel intension, therefore the utility model is not limited by following public specific embodiment.
The utility model discloses a kind of anti-turning-up devices of semitrailer active, include four sets of hydraulic pressure mounted on vehicle frame both sides
Cylinder, acceleration transducer, angular displacement sensor, synchronization hydraulic system and electric-control system, the acceleration transducer is for detecting
The transverse acceleration of semitrailer in the process of moving, angular displacement sensor are used to detect the controllable angle in compartment, acceleration transducer
It is connect with angular displacement sensor signal output end with electric-control system signal input part, the synchronous liquid of electric-control system signal output end connection
Pressure system control terminal, four sets of hydraulic cylinders are rectangular to be distributed in rear in compartment, piston rod top and the container bottom of four sets of hydraulic cylinders
Portion is hinged, and the cylinder body tail end and vehicle frame of four sets of hydraulic cylinders are hinged.
As shown in Figure 1, the electric-control system include microcontroller, acceleration detection module, controllable angle detection module, A/D turn
Block, driving circuit, proportion electro-magnet, acceleration display panel and danger detector are changed the mold, the acceleration transducer is by adding
Velocity measuring module connects single-chip microcomputer signal input terminal with A/D conversion modules, and the angular displacement sensor passes through Angular Displacement Detecting
Module connects single-chip microcomputer signal input terminal with A/D conversion modules, and single-chip microcomputer signal output end controls ratio electricity by driving circuit
Magnet, acceleration display panel and danger detector are and single chip communication.
Referring to attached drawing 3, the acceleration detection module and controllable angle detection module are power amplification circuit, use three
Amplifier MC33274 constitutes power amplification circuit, and for differential input to be become Single-end output, output end connects A/D moduluss of conversion
Block.
Referring to attached drawing 5, the driving circuit includes triangular wave Signal generator of vibration, initial current initialization circuit and power
Amplifying circuit, triangular wave Signal generator of vibration is for realizing the adjustment of frequency and amplitude, and initial current initialization circuit is for adjusting
The zero-bit dead zone size of whole proportional velocity regulating valve avoids dead zone.
Referring to attached drawing 4, the microcontroller is AT89C51 microcontrollers, and acceleration display panel uses 4 seven segment digital tubes,
Microcontroller is connect using decoder SN74LSN chips as interface with the interface of 4 seven segment digital tubes.
Referring to attached drawing 2, the synchronization hydraulic system includes that hydraulic pump 1, filter 2, unloading valve 3, the first 3-position 4-way change
To valve 3, the second three position four-way directional control valve 5, the first ratio one-way speed-regulating valve 6, the second ratio one-way speed-regulating valve 5, the first flow divider
8, the second flow divider 9, the first hydraulic control one-way valve 10, the second hydraulic control one-way valve 11, third hydraulic control one-way valve 12, the 4th fluid-control one-way
Valve 13, first hydraulic cylinder 14, second hydraulic cylinder 15, third hydraulic cylinder 16, the 4th hydraulic cylinder 17, first pressure recuperation valve 20 and
Two pressure-compensated valves 21, first hydraulic cylinder 14 and second hydraulic cylinder 15 are separately mounted to 18 first hinge joint both sides of loading space, third
Hydraulic cylinder 16 and the 4th hydraulic cylinder 17 are separately mounted to 18 second hinge joint both sides of loading space, and filter is installed in 1 outlet end of hydraulic pump
2,1 outlet end of hydraulic pump is separately connected the P of the first three position four-way directional control valve 3 and the second three position four-way directional control valve 5 by hydraulic tube
The A mouths at end, the first three position four-way directional control valve 3 connect the first flow divider 8, the first flow divider 8 by the first ratio one-way speed-regulating valve 6
Outlet end connects first hydraulic cylinder 14 and third hydraulic cylinder 16 by the first hydraulic control one-way valve 10 and third hydraulic control one-way valve 12
Rodless cavity, the B mouths of the first three position four-way directional control valve 3 have bar by what hydraulic tube connected first hydraulic cylinder 14 and second hydraulic cylinder 15
Chamber, the second 5A mouthfuls of three position four-way directional control valve connect the second flow divider 9 by the second ratio one-way speed-regulating valve 5, and the second flow divider 9 goes out
Mouth end passes through the second hydraulic control one-way valve 11 and the 4th hydraulic control one-way valve 13 connects the nothing of second hydraulic cylinder 15 and the 4th hydraulic cylinder 17
Rod cavity, the second 5B mouthfuls of three position four-way directional control valve connect the rod chamber of second hydraulic cylinder 15 and the 4th hydraulic cylinder 17 by hydraulic tube.
The first ratio one-way speed-regulating valve 6 is identical with 5 structure of the second ratio one-way speed-regulating valve, the unidirectional speed governing of the first ratio
Valve 6 includes the first pressure recuperation valve 20 and the first check valve being set up in parallel, and the second ratio one-way speed-regulating valve 5 includes being set up in parallel
First pressure recuperation valve 20 and the second check valve, when the transverse acceleration of semitrailer is not up to setting value, hydraulic pump passes through
Unloading valve carries out off-load, and when the transverse acceleration of version fork truck is up to or over setting value, unloading valve is closed, two sets three four
Electric change valve obtains electric, and the first three-position four-way electromagnetic directional valve is located at right position, and the second three position four-way directional control valve is located at left position, and
One hydraulic cylinder and third hydraulic cylinder synchronous are stretched out, and second hydraulic cylinder and the 4th hydraulic cylinder synchronous are retracted, can using hydraulic control one-way valve
With ensure in hydraulic system fault loading space will not unexpected unstability, and flow stream velocity can be adjusted using one-way speed-regulating valve
Section, it is more adaptable.
During concrete application, actively anti-turning-up devices are installed additional on existing semitrailer, the installation of semi-trailer frame both sides is anti-
Hydraulic cylinder support arm is turned over, four sets of hydraulic cylinders set up separately two-by-two in compartment both sides, and hydraulic cylinder support arm is turned in lower end with the anti-of corresponding position respectively
Hinged, hydraulic cylinder upper end is hinged with loading space respectively, and two hinge joints are arranged between loading space and vehicle frame, and hydraulic cylinder is separately positioned on hinge
Contact both sides, when acceleration transducer detects the transverse acceleration of vehicle up to or over setting value, hydraulic cylinder starts
Action pushes main inversion section to be rotated to anti-obliquity direction, while by controlling between vehicle body plane vertical line and ground perpendicular
Angle（Controllable angle）, to achieve the purpose that control rollover extreme lateral accelerations, and when hydraulic cylinder reaches setting overhang
When, hydraulic cylinder stop motion.
Claims (7)
1. a kind of anti-turning-up devices of semitrailer active, it is characterised in that：Include four sets of hydraulic cylinders, acceleration mounted on vehicle frame both sides
Sensor, angular displacement sensor, synchronization hydraulic system and electric-control system, the acceleration transducer are expert at for detecting semitrailer
Transverse acceleration during sailing, angular displacement sensor are used to detect the controllable angle in compartment, and acceleration transducer and angular displacement pass
Sensor signal output end is connect with electric-control system signal input part, and electric-control system signal output end connects synchronization hydraulic system control
End, four sets of hydraulic cylinders are rectangular to be distributed in rear in compartment, and the piston rod top and container bottom of four sets of hydraulic cylinders are hinged, four sets
The cylinder body tail end of hydraulic cylinder is hinged with vehicle frame.
2. the anti-turning-up devices of semitrailer active according to claim 1, it is characterised in that：The electric-control system includes monolithic
Machine, acceleration detection module, controllable angle detection module, A/D conversion modules, driving circuit, proportion electro-magnet, acceleration display surface
Plate and danger detector, the acceleration transducer connect single-chip microcomputer signal by acceleration detection module with A/D conversion modules
Input terminal, the angular displacement sensor connect single-chip microcomputer signal input terminal by Angular Displacement Detecting module with A/D conversion modules, single
Piece machine signal output end controls proportion electro-magnet by driving circuit, and acceleration display panel and danger detector are and microcontroller
Communication.
3. the anti-turning-up devices of semitrailer active according to claim 2, it is characterised in that：The acceleration detection module and can
It is power amplification circuit to control angle detection module, uses three amplifier MC33274 to constitute power amplification circuit, being used for will be differential defeated
Entering becomes Single-end output, and output end connects A/D conversion modules.
4. the anti-turning-up devices of semitrailer active according to claim 3, it is characterised in that：The driving circuit includes triangular wave
Signal generator of vibration, initial current initialization circuit and power amplification circuit, triangular wave Signal generator of vibration is for realizing frequency
The adjustment of rate and amplitude, initial current initialization circuit are used to adjust the zero-bit dead zone size of proportional velocity regulating valve or avoid dead zone.
5. the anti-turning-up devices of semitrailer active according to claim 4, it is characterised in that：The microcontroller is that AT89C51 is mono-
Piece machine, acceleration display panel use 4 seven segment digital tubes, and microcontroller is using decoder SN74LSN chips as interface, with 4
The interface of seven segment digital tubes connects.
6. the anti-turning-up devices of semitrailer active according to claim 5, it is characterised in that：The synchronization hydraulic system includes liquid
Press pump（1）, filter（2）, unloading valve（3）, the first three position four-way directional control valve（4）, the second three position four-way directional control valve（5）, first
Ratio one-way speed-regulating valve（6）, the second ratio one-way speed-regulating valve（5）, the first flow divider（8）, the second flow divider（9）, the first hydraulic control
Check valve（10）, the second hydraulic control one-way valve（11）, third hydraulic control one-way valve（12）, the 4th hydraulic control one-way valve（13）, the first hydraulic pressure
Cylinder（14）, second hydraulic cylinder（15）, third hydraulic cylinder（16）, the 4th hydraulic cylinder（17）, first pressure recuperation valve（20）With second
Pressure-compensated valve（21）, first hydraulic cylinder（14）And second hydraulic cylinder（15）It is separately mounted to loading space（18）First hinge joint two
Side, third hydraulic cylinder（16）With the 4th hydraulic cylinder（17）It is separately mounted to loading space（18）Second hinge joint both sides, hydraulic pump（1）Go out
Mouth end is installed by filter（2）, hydraulic pump（1）Outlet end is separately connected the first three position four-way directional control valve by hydraulic tube（3）With
Two three position four-way directional control valves（5）The ends P, the first three position four-way directional control valve（3）A mouths pass through the first ratio one-way speed-regulating valve（6）
Connect the first flow divider（8）, the first flow divider（8）Outlet end passes through the first hydraulic control one-way valve（10）With third hydraulic control one-way valve
（12）Connect first hydraulic cylinder（14）With third hydraulic cylinder（16）Rodless cavity, the first three position four-way directional control valve（3）B mouths pass through
Hydraulic tube connects first hydraulic cylinder（14）And second hydraulic cylinder（15）Rod chamber, the second three position four-way directional control valve（5）A mouthfuls pass through
Second ratio one-way speed-regulating valve（5）Connect the second flow divider（9）, the second flow divider（9）Outlet end passes through the second hydraulic control one-way valve
（11）With the 4th hydraulic control one-way valve（13）Connect second hydraulic cylinder（15）With the 4th hydraulic cylinder（17）Rodless cavity, the two or three four
Logical reversal valve（5）B mouthfuls connect second hydraulic cylinder by hydraulic tube（15）With the 4th hydraulic cylinder（17）Rod chamber.
7. the anti-turning-up devices of semitrailer active according to claim 6, it is characterised in that：The first ratio one-way speed-regulating valve
（6）With the second ratio one-way speed-regulating valve（5）Structure is identical, the first ratio one-way speed-regulating valve（6）Including the first pressure being set up in parallel
Force compensating valve（20）With the first check valve, the second ratio one-way speed-regulating valve（5）Including the first pressure recuperation valve being set up in parallel
（20）With the second check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820116083.4U CN207773290U (en) | 2018-01-24 | 2018-01-24 | The anti-turning-up devices of semitrailer active |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820116083.4U CN207773290U (en) | 2018-01-24 | 2018-01-24 | The anti-turning-up devices of semitrailer active |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207773290U true CN207773290U (en) | 2018-08-28 |
Family
ID=63211328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820116083.4U Expired - Fee Related CN207773290U (en) | 2018-01-24 | 2018-01-24 | The anti-turning-up devices of semitrailer active |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207773290U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114179720A (en) * | 2021-12-03 | 2022-03-15 | 中国煤炭科工集团太原研究院有限公司 | Carrier early warning system and carrier early warning method |
| CN116858573A (en) * | 2023-09-04 | 2023-10-10 | 山东梁山华宇集团汽车制造有限公司 | Semitrailer performance test platform |
-
2018
- 2018-01-24 CN CN201820116083.4U patent/CN207773290U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114179720A (en) * | 2021-12-03 | 2022-03-15 | 中国煤炭科工集团太原研究院有限公司 | Carrier early warning system and carrier early warning method |
| CN114179720B (en) * | 2021-12-03 | 2023-11-03 | 中国煤炭科工集团太原研究院有限公司 | Carrier early warning system and carrier early warning method |
| CN116858573A (en) * | 2023-09-04 | 2023-10-10 | 山东梁山华宇集团汽车制造有限公司 | Semitrailer performance test platform |
| CN116858573B (en) * | 2023-09-04 | 2023-11-21 | 山东梁山华宇集团汽车制造有限公司 | Semitrailer performance test platform |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |