CN212844399U - Portable on-board test visual display system - Google Patents
Portable on-board test visual display system Download PDFInfo
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- CN212844399U CN212844399U CN202022134292.1U CN202022134292U CN212844399U CN 212844399 U CN212844399 U CN 212844399U CN 202022134292 U CN202022134292 U CN 202022134292U CN 212844399 U CN212844399 U CN 212844399U
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Abstract
The application provides a portable on-machine test visual display system, includes: the projector, the projection curtain and be used for the projector of fixed projector to support and adjust the support and the projection curtain that is used for fixed projection curtain supports and adjusts the support, wherein, the projection curtain supports to adjust the support and the projector supports and adjusts the support is tripod supporting structure, the bottom of every landing leg of support is the spheroid structure, with the spheroid structure as for on the unable adjustment base who has the ball chamber, thereby realize the multi-angle installation between unable adjustment base and the landing leg, the landing leg all can stretch out and draw back the regulation, and can make the projector can be from top to bottom to centre gripping or the bearing structure of projector and projection curtain, control, adjust around, the support of projector adjusts the pole also can realize the upper and lower of projector simultaneously, control, rotatory regulation, the fixed mechanical hand of projector is grabbed and can be realized the fine setting of projector angle. The system of the application can realize the accurate adjustment control of the sight path, the eyepoint and the view field angle.
Description
Technical Field
The application belongs to the technical field of airplane tests, and particularly relates to a portable onboard test visual display system.
Background
At present, in the on-board test process, when a tester operates an airplane to simulate flight, the tester needs to see a clear simulation visual picture with enough size right in front of the airplane to fly the airplane to a specified airspace. The simulation visual scene picture of the onboard test is displayed by a display with a certain size (usually, the size is not too large, such as 19 inches) placed on the boarding ladder, when a tester simulates flight, the head needs to be turned by 60 degrees to see the simulation visual scene picture on the display, and because the display has low resolution and small size, the simulation visual scene picture seen by the tester is not clear enough, so that the tester is difficult to accurately and comfortably control the airplane.
The traditional on-board visual display equipment needs to be arranged on the landing platform surface with limited space, occupies most space of the landing platform, and brings great trouble to workers for getting on and off the airplane. Meanwhile, the traditional visual display equipment installation mode has potential safety hazards of people falling off from the platform and tripping on cables.
Disclosure of Invention
It is an object of the present application to provide a portable on-board trial view display system that solves or mitigates at least one of the problems of the background art.
The technical scheme of the application is as follows: a portable on-board test vision display system, comprising:
the projector, the projection screen, a projector supporting and adjusting bracket for fixing the projector and a projection screen supporting and adjusting bracket for fixing the projection screen are both in a tripod structure;
the projection screen support adjusting bracket includes:
the device comprises a projection screen fixing base, projection screen supporting legs, a telescopic adjusting device, a projection screen upper base, a curtain longitudinal supporting rod and a curtain transverse supporting rod;
the projection screen supporting leg is arranged between the projection screen fixing base and the projection screen upper base, the telescopic adjusting device is arranged on the projection screen supporting leg, the length of the projection screen supporting leg can be changed through the telescopic adjusting device, the curtain longitudinal supporting rod can be arranged on the projection screen upper base in a pivoting mode, the curtain transverse supporting rod is pivoted with the curtain longitudinal supporting rod, and the projection screen is arranged on the curtain transverse supporting rod;
the projector support adjustment bracket includes:
the projector fixing base, the projector supporting legs, the projector upper base, the projector normal supporting rod, the projector transverse supporting rod and the projector mechanical gripper are arranged on the projector fixing base;
the projector supporting leg is arranged between bases on the projector fixing base and the projector, the projector supporting leg can realize the change in the length direction of the supporting leg, the projector normal supporting rod is movably arranged on the projector bases, the projector transverse supporting rod is movably arranged at one end of the projector normal supporting rod, the angle of the projector mechanical gripper is adjustable and is arranged at the end part of the projector transverse supporting rod, and the projector is supported through the projector mechanical gripper.
In a preferred embodiment of this application, the tip of projection screen landing leg has spherical structure, projection screen unable adjustment base has the ball chamber, realizes projection screen landing leg and projection screen unable adjustment base's multi-angle installation through the cooperation of spherical structure and ball chamber.
In a preferred embodiment of the present application, the projection screen fixing base is a split clamp, and the projection screen support legs of any size spherical structure can be fixed by replacing clamps of different models.
In a preferred embodiment of the present application, the telescopic adjusting apparatus includes: the lead screw, set up two support rings and the adjustable ring on the lead screw, in the tubular structure of landing leg was stretched into to the lead screw, adjusted through rotating the support ring the relative position of tubular structure, the adjustable ring setting is in the centre of two support rings, realizes dying the lock of support ring through rotating the adjustable ring.
In a preferred embodiment of the present application, the base on the projection screen includes: a body structure and be located respectively the projection curtain landing leg mount pad and the projection curtain branch mount pad of body structure both sides, projection curtain landing leg pin joint in projection curtain landing leg mount pad are equipped with the ratchet pivot on the projection curtain branch mount pad, and the vertical branch of curtain passes through pivot pin joint base on the projection curtain.
In a preferred embodiment of the present application, the end of the projector leg has a spherical structure, the projector fixing base has a spherical cavity, and the projector leg and the projector fixing base are mounted at multiple angles by the cooperation of the spherical structure and the spherical cavity.
In a preferred embodiment of the present application, the projector support leg includes a support leg outer cylinder and a support leg inner cylinder which can move relatively, a support leg locking nail is arranged through the support leg outer cylinder, and the support leg outer cylinder and the support leg inner cylinder can be relatively fixed through the support leg locking nail.
In a preferred embodiment of the present application, the projector upper base includes:
the body structure and be located respectively the projector landing leg mount pad and the projector branch mount pad of body structure both sides, projector landing leg pin joint in projector landing leg mount pad, the mobilizable connection in projector branch mount pad of projector normal direction branch pass projector branch mount pad through threaded connection spare in order to realize the fixed of projector normal direction branch and projector branch mount pad.
In a preferred embodiment of the present application, the end of the projector transverse strut has a spherical structure, the projector gripper has a spherical cavity, and the projector transverse strut and the projector gripper are mounted at multiple angles by the cooperation of the spherical structure and the spherical cavity.
In a preferred embodiment of the present application, the projector gripper includes:
the gripper comprises a gripper seat, a plurality of basic sections pivoted to the gripper seat and movable sections capable of moving relative to the basic sections, wherein the basic sections are uniformly distributed along the axis of the gripper seat, and the movable sections can be locked through connecting pieces penetrating through the basic sections, so that the movable sections and the basic sections are relatively fixed.
The utility model provides a portable on-machine experimental view display system is because projection curtain and projector all adopt adjustable tripod structure for as bearing structure for equipment can be stably fixed, has improved the reliability, can install and fix on the airstairs of multiple different structures simultaneously, has also improved the universal performance of equipment.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
Fig. 1 is a schematic view of a projection screen support adjusting bracket according to the present application.
Fig. 2 is a schematic view of a projection screen supporting leg and a projection screen fixing base according to the present application.
Fig. 3 is a schematic view of the telescopic adjustment device of the present application.
Fig. 4 is a schematic view of a base on the projection screen of the present application.
FIG. 5 is a schematic view of a curtain crossbar of the present application.
Fig. 6 is a schematic view of a projector support adjustment bracket of the present application.
Fig. 7 is a schematic view of an upper base of the projector according to the present application.
Fig. 8 is a schematic view of a projector gripper according to the present application.
Reference numerals:
1-projection screen supporting and adjusting bracket
11-projection screen fixing base
12-projection screen leg, 121-spherical structure
13-telescoping adjustment device, 131-adjusting ring, 132-support ring, 133-lead screw
14-upper base of projection screen, 141-supporting leg mounting base of projection screen, 142-supporting rod mounting base of projection screen and 143-ratchet wheel rotating shaft
15-curtain longitudinal support rod
16-rotating shaft
17-curtain transverse strut
2-projector supporting and adjusting bracket
21-projector fixing base
22-projector leg, 221-leg lock pin, 222-leg inner cylinder, 223-leg outer cylinder
23-projector upper base, 231-projector leg mount, 232-projector strut mount
24-projector strut, 241-projector normal strut, 242-projector transverse strut, 243-projector transverse strut mount
25-projector mechanical gripper, 251-gripper seat, 252-gripper base section, 253-gripper extension section, 254-gripper locking pin, 255-pivot section
3-projection screen
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
In order to make up the problem that the conventional on-board visual display system cannot enable testers to see a wider and clear visual scene right in front of an airplane, the application provides the visual system used in the on-board flight simulation test, the system can provide an extravehicular scene for a pilot during flight, the fidelity of a test environment is improved, and the flight immersion of the pilot is increased.
As shown in fig. 1 and 6, the portable on-board test visual display system provided by the present application includes: the projector comprises a projection screen, a projector/projector (not shown), a projection screen supporting and adjusting bracket 1 for supporting and fixing the projection screen, and a projector supporting and adjusting bracket 2 for supporting and fixing the projector, wherein the projection screen supporting and adjusting bracket 1 and the projector supporting and adjusting bracket 2 are both tripod structures.
Specifically, as shown in fig. 1, the projection screen supporting and adjusting bracket 1 includes: the projection screen comprises a projection screen fixing base 11, projection screen supporting legs 12, a telescopic adjusting device 13, a projection screen upper base 14, a projection screen longitudinal supporting rod 15 and a projection screen transverse supporting rod 17. Projection curtain landing leg 12 is connected with projection curtain unable adjustment base 11 and projection curtain upper base 14 respectively, and flexible adjusting device 13 sets up on projection curtain landing leg 12, can realize the change of projection curtain landing leg 12 length through flexible adjusting device 13, and the setting of curtain vertical branch 15 pivotable is base 14 on the projection curtain, and the pivot joint is passed through pivot 16 with curtain vertical branch 15 to curtain horizontal branch 17, and projection curtain 3 sets up on curtain horizontal branch 17.
In above-mentioned projection screen supports adjusts support 1, the tip of every projection screen landing leg 12 has spherical structure 121, and projection screen unable adjustment base 11 has the ball chamber, and the spherical structure of metal on the projection screen landing leg 121 is installed in the ball intracavity of projection screen unable adjustment base 11, can realize the multi-angle installation of projection screen landing leg and projection screen unable adjustment base through the cooperation in spherical structure 121 and ball chamber, as shown in fig. 2.
In this application, the projection screen fixing base 11 is a split clamp, the middle part of the split clamp is a spherical cavity, and the split clamp is fastened through a connecting piece. The projection screen fixing base 11 is connected with a fixing point on the airplane structure, so that the projection screen supporting and adjusting support 1 is fixed.
Continuing to refer to fig. 2 and fig. 3, the projection screen leg 12 has two tubular structures, the telescopic adjustment device 13 further includes a screw 33, two support rings 132 disposed on the screw, and an adjustment ring 131, the screw 133 extends into the two tubular structures of the projection screen leg 12, the support rings 132 are rotated to support and adjust the relative positions of the tubular structures, so that the support rings 132 move along the axial direction of the screw to adjust the length of the projection screen leg 12, the adjustment ring 131 is disposed between the two support rings 132, and the support rings 132 can be locked by rotating the adjustment ring 131.
As shown in fig. 4, the upper base 14 of the projection screen includes a body structure, and a leg mounting seat 141 and a leg mounting seat 142 of the projection screen respectively located at two sides of the body structure, the end of the leg 12 of the projection screen is pivotally connected to the leg mounting seat 141 of the projection screen, the leg mounting seat 132 of the projection screen is provided with a ratchet shaft 143, and the longitudinal support bar 15 of the screen is pivotally connected to the upper base 142 of the projection screen through the ratchet shaft 143.
It will be appreciated that in the above-described pivoted or articulated position of the present application, bearings may be provided to improve load bearing capacity or rotational smoothness.
After the tripod structure is installed, the projection screen transverse strut 15 and the projection screen longitudinal strut 17 are connected through the rotating shaft 16, as shown in fig. 5. After the connection is completed, the end of the projection screen longitudinal strut 15 is connected with the ratchet wheel rotating shaft 143 of the projection screen upper base 14, and is reinforced by bolts, and then the projection screen 3 is slowly lifted to a proper position.
Finally, the transverse strut 17 of the projection screen is rotated out clockwise to a proper position and the projection screen 3 is discharged.
The projector support adjusting bracket 2 shown in fig. 6 is an assembly view of a projector support adjusting bracket structure, and includes a projector fixing base 21, a projector leg 22, a projector upper base 23, a projector strut 24 (including a projector normal strut 241 and a projector lateral strut 242), and a projector gripper 25. The projector supporting leg 22 is arranged between the projector fixing base 21 and the projector upper base 23, the projector supporting leg 22 can change the length direction of the supporting leg, the projector normal supporting rod 241 is movably arranged on the projector upper base 23, the projector transverse supporting rod 242 is movably arranged at one end of the projector normal supporting rod 241, the projector mechanical claw 25 is angularly adjustable and arranged at the end of the projector transverse supporting rod 242, and the projector is supported by the projector mechanical claw.
The connection mode of the projector support leg 22 and the projector fixing base 21 is the same as the connection mode of the projection screen support leg 12 and the projection screen fixing base 11, and the description is omitted here.
The projector leg 22 comprises a leg outer cylinder 223 and a leg inner cylinder 222 which can move relatively, a leg locking nail 221 is arranged on the leg outer cylinder 223 in a penetrating mode, when the leg locking nail 221 is unscrewed, the leg outer cylinder 223 and the leg inner cylinder 222 can move relatively, so that the length of the projector leg 22 is changed, and the leg outer cylinder 223 and the leg inner cylinder 222 can be fixed relatively by screwing the leg locking nail 221. It is understood that the number of leg pins 221 provided on the leg outer cylinder 223 may be plural, for example, in the embodiment shown in fig. 6, the number of leg pins 221 provided on each leg outer cylinder 223 is two.
As shown in fig. 7, the projector upper base 23 includes a body structure, and a projector leg mounting seat 231 and a projector strut mounting seat 232 respectively located at two sides of the body structure, the projector leg 231 is pivotally connected to the projector leg mounting seat 231, the projector normal strut 241 is movably connected to the projector strut mounting seat 232, and when the projector normal strut 241 is adjusted to a proper position, the projector normal strut 241 and the projector strut mounting seat 232 can be fixed by a threaded connection through the projector strut mounting seat 232.
The projector normal strut 241 has a transverse strut mounting seat 243 at the end, the structure of the transverse strut mounting seat 243 is similar to that of the projector strut mounting seat 232, when the projector transverse strut 242 is adjusted to a proper position, the relative position of the projector normal strut 241 and the projector transverse strut can be fixed by a connecting piece penetrating through the transverse strut mounting seat 243.
As shown in fig. 8, the connection structure of the projector transverse strut 242 and the projector gripper is the same as the connection structure of the support leg and the fixed base, that is, the end of the projector transverse strut 242 has a spherical structure 244, the projector gripper 25 has a spherical cavity, and the projector transverse strut and the projector gripper are mounted in multiple angles by the cooperation of the spherical structure and the spherical cavity.
Finally, the mechanical gripper 25 of the projector comprises a gripper seat 251, a plurality of gripper base sections 252 pivotally connected to the gripper seat 251, and a gripper extension section 253 movable relative to the gripper base sections 252, wherein the plurality of gripper base sections 252 are uniformly distributed along the axis of the gripper seat 251 (i.e. the extension direction of the projector transverse strut 242 in fig. 6), and the gripper extension section 253 can be locked by a connecting member 254 passing through the gripper base sections, so that the gripper extension section 253 and the gripper base section 254 are relatively fixed. Furthermore, the base joint 252 is pivotally connected to the base 251 at a pivot 255, the plane of rotation being substantially perpendicular to the extension of the transverse strut 242 of the projector. It will be appreciated that the number of the base gripper segments 252 in this application should be at least three to enable a stable fixation of the projector, for example four in the illustrated embodiment.
In this application, support and adjust support 2 and projection curtain support and adjust support 1 and adopt similar project organization, be triangle-shaped supporting structure promptly, the landing leg is adjustable mechanism with the base, and the bottom of every landing leg is the spheroid structure, with the spheroid structure as for on the unable adjustment base who has the ball chamber to realize the multi-angle installation between unable adjustment base and the landing leg. The utility model discloses a projection screen support leg, including the body, the body is fixed with the fixed base, the screw structure has been installed additional on the projection screen support leg simultaneously, the adjusting device through manual rotatory lead screw can realize the extension and the shortening of landing leg, the projector landing leg is adjusted through extending structure.
The connection structure of base on the projection screen can produce displacement and rotation in different directions along with the length of landing leg and the change of angle to realized adjusting the position of projection screen. The projection screen longitudinal supporting rod and the projection screen transverse supporting rod can adjust the pitching of the support through the ratchet wheel rotating shaft fixed on the base, the projection screen transverse rod can be retracted and unfolded through the rotating shaft, and a screen of the projection screen is retracted and unfolded through the motor.
The fixing device of the projector is fixed by a mechanical paw which can be adjusted in multiple directions. The tops of the four claws of the manipulator are fixedly connected with the four mounting screw holes of the projector.
The application provides a portable on-machine test visual display system: because projection screen and projector all adopt adjustable tripod structure for as bearing structure, this provides the guarantee of reliability for the stable fixed of equipment. Meanwhile, the structural design can be installed and fixed on the airstairs with various different structures, and the general performance of the equipment is also improved.
The projection screen transverse supporting rod and the longitudinal supporting rod are connected by adopting a rotating shaft structure design, and the projection screen transverse supporting rod is in a withdrawing state before installation, so that the rotating torque in the installation process of the longitudinal supporting rod is reduced, and the installation is convenient for workers to install the projection screen transverse supporting rod. After the staff has installed the vertical branch of projection screen, lift up the vertical branch of projection screen to suitable angle, then release the horizontal branch of projection screen to suitable position, this structure has increased the flexibility of equipment use and the convenience of installation.
The adjustable function of the projector supporting and adjusting support enables the projector to be adjusted up and down, left and right, front and back, meanwhile, the supporting and adjusting rod of the projector can also achieve up and down, left and right and rotation adjustment of the projector, and the projector can be finely adjusted by being held by a fixed mechanical hand. The above conditions are combined, so that the accurate adjustment control of the sight path, the eyepoint and the view field angle can be realized.
The field angle and the resolution ratio of the visual scene can be greatly increased, the high-gain projection screen is adopted by the projection screen, the brightness and the contrast of the visual scene picture can be increased by the projection screen, and the definition of the visual scene picture is further improved, so that the airplane control personnel can see a wider and clear scene in the process of simulating flight.
This application adopts electronic lift light soft curtain in the upper place before aircraft nose, and high bright small and exquisite laser projector fixes on aircraft cabin side fixed bolster, can provide the flight view in the dead ahead for the pilot, has both guaranteed the wide field angle, can guarantee the safety of aircraft again. The projector and the fixing support of the electric soft screen are designed in a folding connecting rod type structure, so that the portability of the outfield test equipment is ensured, and the stability of the whole visual system structure can be ensured. The whole vision system can be fixedly connected on the airstairs with different models through clamps with different forms, so that the universality of the vision system is ensured, and the onboard flight simulation test of airplanes with various models can be supported.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A portable on-board test visual display system, comprising:
the projector, the projection screen, a projector supporting and adjusting bracket for fixing the projector and a projection screen supporting and adjusting bracket for fixing the projection screen are both in a tripod structure;
the projection screen support adjusting bracket includes:
the device comprises a projection screen fixing base, projection screen supporting legs, a telescopic adjusting device, a projection screen upper base, a curtain longitudinal supporting rod and a curtain transverse supporting rod;
the projection screen supporting leg is arranged between the projection screen fixing base and the projection screen upper base, the telescopic adjusting device is arranged on the projection screen supporting leg, the length of the projection screen supporting leg can be changed through the telescopic adjusting device, the curtain longitudinal supporting rod can be arranged on the projection screen upper base in a pivoting mode, the curtain transverse supporting rod is pivoted with the curtain longitudinal supporting rod, and the projection screen is arranged on the curtain transverse supporting rod;
the projector support adjustment bracket includes:
the projector fixing base, the projector supporting legs, the projector upper base, the projector normal supporting rod, the projector transverse supporting rod and the projector mechanical gripper are arranged on the projector fixing base;
the projector supporting leg is arranged between bases on the projector fixing base and the projector, the projector supporting leg can realize the change in the length direction of the supporting leg, the projector normal supporting rod is movably arranged on the projector bases, the projector transverse supporting rod is movably arranged at one end of the projector normal supporting rod, the angle of the projector mechanical gripper is adjustable and is arranged at the end part of the projector transverse supporting rod, and the projector is supported through the projector mechanical gripper.
2. The portable on-board experimental vision display system of claim 1, wherein the end of the projection screen leg has a spherical structure, the projection screen mount has a spherical cavity, and the projection screen leg and the projection screen mount are mounted at multiple angles by the spherical structure and the spherical cavity.
3. The portable on-board experimental vision display system of claim 2, wherein said screen mount base is a split clamp, and any size of spherical screen leg can be fixed by replacing different types of clamps.
4. The portable on-board test vision display system of claim 1, wherein said telescoping adjustment means comprises: the lead screw, set up two support rings and the adjustable ring on the lead screw, in the tubular structure of landing leg was stretched into to the lead screw, adjusted through rotating the support ring the relative position of tubular structure, the adjustable ring setting is in the centre of two support rings, realizes dying the lock of support ring through rotating the adjustable ring.
5. A portable on-board trial viewing display system as claimed in claim 1, wherein the projection screen upper mount comprises: a body structure and be located respectively the projection curtain landing leg mount pad and the projection curtain branch mount pad of body structure both sides, projection curtain landing leg pin joint in projection curtain landing leg mount pad are equipped with the ratchet pivot on the projection curtain branch mount pad, and the vertical branch of curtain passes through pivot pin joint base on the projection curtain.
6. The portable on-board test vision display system of claim 1, wherein the projector leg has a ball structure at an end thereof, and the projector mount base has a ball cavity, and the projector leg and the projector mount base are mounted at a plurality of angles by engagement of the ball structure and the ball cavity.
7. The portable on-board test vision display system of claim 1, wherein the projector leg includes a leg outer cylinder and a leg inner cylinder that are relatively movable, and a leg locking pin is provided through the leg outer cylinder, by which the leg outer cylinder and the leg inner cylinder can be relatively fixed.
8. The portable on-board test vision display system of claim 1, wherein the projector upper base includes:
the body structure and be located respectively the projector landing leg mount pad and the projector branch mount pad of body structure both sides, projector landing leg pin joint in projector landing leg mount pad, the mobilizable connection in projector branch mount pad of projector normal direction branch pass projector branch mount pad through threaded connection spare in order to realize the fixed of projector normal direction branch and projector branch mount pad.
9. The portable on-board test vision display system of claim 1, wherein the projector cross bar has a ball structure at its end and the projector gripper has a ball cavity, and the multi-angle mounting of the projector cross bar and the projector gripper is achieved by the cooperation of the ball structure and the ball cavity.
10. The portable on-board test vision display system of claim 9, wherein the projector gripper comprises:
the gripper comprises a gripper seat, a plurality of gripper basic sections pivoted to the gripper seat and gripper extension sections capable of moving relative to the gripper basic sections, wherein the gripper basic sections are uniformly distributed along the axis of the gripper seat, and the gripper extension sections can be locked through connecting pieces penetrating through the gripper basic sections, so that the gripper extension sections and the gripper basic sections are relatively fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022134292.1U CN212844399U (en) | 2020-09-25 | 2020-09-25 | Portable on-board test visual display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022134292.1U CN212844399U (en) | 2020-09-25 | 2020-09-25 | Portable on-board test visual display system |
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| Publication Number | Publication Date |
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| CN212844399U true CN212844399U (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022134292.1U Active CN212844399U (en) | 2020-09-25 | 2020-09-25 | Portable on-board test visual display system |
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| CN (1) | CN212844399U (en) |
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- 2020-09-25 CN CN202022134292.1U patent/CN212844399U/en active Active
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