CN219084300U - Unmanned aerial vehicle focus detection device and system - Google Patents
Unmanned aerial vehicle focus detection device and system Download PDFInfo
- Publication number
- CN219084300U CN219084300U CN202223398093.7U CN202223398093U CN219084300U CN 219084300 U CN219084300 U CN 219084300U CN 202223398093 U CN202223398093 U CN 202223398093U CN 219084300 U CN219084300 U CN 219084300U
- Authority
- CN
- China
- Prior art keywords
- aerial vehicle
- unmanned aerial
- gravity
- detection
- detection part
- 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.)
- Active
Links
Images
Landscapes
- Testing Of Balance (AREA)
Abstract
The utility model relates to the field of aviation equipment detection, in particular to an unmanned aerial vehicle gravity center detection device and an unmanned aerial vehicle gravity center detection system. Unmanned aerial vehicle focus detection device includes: the connecting part is used for connecting or abutting on different positions of the unmanned aerial vehicle; and three gravity detection parts are respectively connected with one connecting part and are used for detecting the gravity value of the unmanned aerial vehicle at the connecting point. The gravity values of three different positions on the unmanned aerial vehicle are obtained through the three gravity detection parts, and the gravity center position of the unmanned aerial vehicle can be calculated in time through a general formula. Unmanned aerial vehicle focus detecting system includes unmanned aerial vehicle focus detection device, still includes: the data transmission module is connected with the gravity detection part of the unmanned aerial vehicle gravity center detection device; and the user terminal is connected with the data transmission module and is used for receiving the data detected by the gravity detection part.
Description
Technical Field
The utility model relates to the field of aviation equipment detection, in particular to an unmanned aerial vehicle gravity center detection device and an unmanned aerial vehicle gravity center detection system.
Background
Parameters such as the mass, the mass center or the gravity center of the unmanned aerial vehicle are critical to flight control, and the mass center or the gravity center is inaccurate in measurement, so that the flight test is easy to fail. Unmanned aerial vehicle flight test sites often fail to provide specialized mass centroid measurement equipment, and landing gear support testing methods are generally employed. However, the landing gear may be subject to incorrect positioning and design of the support points of the landing gear wheels due to the movement of the wheels when the landing gear is compressed by the assembly errors, which may result in inaccurate measurements of the landing gear support test method. There is therefore a need for a new device or system for measuring the centre of mass or centre of gravity of a drone that is fast and simple in construction, without the need for excessive transmission members.
Disclosure of Invention
The utility model aims to provide a gravity center detection device of an unmanned aerial vehicle, so as to try to solve the problems of inconvenient and inaccurate detection of the existing detection equipment, and the gravity center position of the unmanned aerial vehicle can be quickly obtained through a simple weight parameter acquisition mechanism by measuring at different supporting points.
An aspect of the present utility model provides an unmanned aerial vehicle center of gravity detection device, including:
the connecting part is used for connecting or abutting on different positions of the unmanned aerial vehicle; and
and the three gravity detection parts are respectively connected with one connecting part and are used for detecting the gravity value of the unmanned aerial vehicle at the connecting point.
The three gravity detection parts are arranged, the gravity values of three different positions on the unmanned aerial vehicle are obtained, the gravity center position of the unmanned aerial vehicle can be timely calculated through a general formula, the calculation formula can be preset in the user terminal, and three numerical values can be directly input during actual operation.
In some embodiments of the present application, the three gravity detection portions are a first detection portion, a second detection portion, and a third detection portion, which are arranged at intervals, respectively; the first detection part is used for being arranged on the symmetry plane of the unmanned aerial vehicle; the second detection part and the third detection part are respectively arranged on two sides of the symmetry plane and are symmetrically arranged.
Set up first detection portion on the unmanned aerial vehicle symmetry plane, second detection portion, third detection portion are used for arranging in the both sides and the symmetry setting of above-mentioned symmetry plane respectively, make things convenient for this unmanned aerial vehicle focus detection device to confirm the prequalification point of check point like this, conveniently carry out a lot of to not unidimensional unmanned aerial vehicle and detect.
In some embodiments of the present application, the connecting lines among the first detecting portion, the second detecting portion and the third detecting portion form an isosceles triangle.
In some embodiments of the present application, the unmanned aerial vehicle center of gravity detection device further comprises a level for arrangement on an upper side or a lower side of the unmanned aerial vehicle.
In some embodiments of the present application, the gravity detecting unit includes:
the top end of the lifter is connected with a connecting part arranged at the lower side of the unmanned aerial vehicle;
and the weighing platform of the checkweigher is connected with the bottom end of the lifter and used for supporting the unmanned aerial vehicle.
In other embodiments of the present application, the gravity detecting unit includes:
one end of the pull rope is connected with a connecting part arranged on the upper side of the unmanned aerial vehicle;
and the lifting hook of the hanging scale is connected with the other end of the pull rope and is used for suspending the unmanned aerial vehicle.
The gravity value after leveling is obtained in a mode of setting the pull rope and the hanging balance, and the gravity value can be obtained in a mode of inconvenient setting and supporting to carry out the arrangement of the scheme.
In some embodiments of the present application, the top end of the lifter is a stud, and the connecting portion is a threaded hole formed in the unmanned aerial vehicle; or the top end of the lifter is a conical top, and the connecting part is a conical groove matched with the conical top on the unmanned aerial vehicle; or the connecting part is a cushion block, a butt joint groove matched with the top end of the lifter is formed in the lower side of the cushion block, and a friction surface for abutting against the unmanned aerial vehicle is formed in the upper side of the cushion block.
The second aspect of the utility model also provides an unmanned aerial vehicle gravity center detection system, which comprises the unmanned aerial vehicle gravity center detection device of the first aspect and the improvement scheme thereof;
this unmanned aerial vehicle focus detecting system still includes:
the data transmission module is connected with a gravity detection part of the unmanned aerial vehicle gravity center detection device;
and the user terminal is connected with the data transmission module and is used for receiving the data detected by the gravity detection part.
Through adopting this unmanned aerial vehicle focus detecting system, the gravity value that obtains directly inputs user terminal in, and the user terminal directly calculates unmanned aerial vehicle focus position.
In some embodiments of the present application, the data transmission module includes a serial connector disposed on the gravity detection portion and connected to the user terminal through a cable.
In some embodiments of the present application, the data transmission module includes a bluetooth module, where the bluetooth module is disposed on a gravity detection unit, and the gravity detection unit is communicatively connected to the user terminal through the bluetooth module.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram for explaining a gravity center detection device of an unmanned aerial vehicle of embodiment 1;
fig. 2 is a schematic diagram for explaining a gravity center detection device of the unmanned aerial vehicle of embodiment 1;
fig. 3 is a schematic diagram for explaining the connection of the connection portion and the gravity detection portion in the unmanned aerial vehicle gravity center detection device of embodiment 1;
fig. 4 is a schematic diagram for explaining one connection manner of the connection portion and the gravity detection portion in the unmanned aerial vehicle gravity center detection device of embodiment 1;
fig. 5 is a schematic diagram for explaining another connection mode of the connection portion and the gravity detection portion in the unmanned aerial vehicle gravity center detection device of embodiment 1;
fig. 6 is a schematic diagram for explaining another connection mode of the connection portion and the gravity detection portion in the unmanned aerial vehicle gravity center detection device of embodiment 1;
fig. 7 is a schematic diagram for explaining each point of the calculated center of gravity of the unmanned aerial vehicle center of gravity detecting device of embodiment 1;
fig. 8 is a schematic diagram for explaining a gravity center detecting device of the unmanned aerial vehicle of embodiment 2;
fig. 9 is a schematic diagram for explaining an embodiment of the unmanned aerial vehicle gravity center detection system of example 3;
fig. 10 is a schematic diagram for explaining another embodiment of the unmanned aerial vehicle gravity center detection system of embodiment 3;
reference numerals: the system comprises a 1-unmanned aerial vehicle, a 100-connecting part, a 100 a-threaded hole, a 100 c-cushion block, a 2-gravity detecting part, a 210-lifter, a 220-checkweigher, a 230-stay cord, a 240-hanging balance, a 2 a-first detecting part, a 2 b-second detecting part, a 2 c-third detecting part, a 3-user terminal and a 4-level meter.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the utility model. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order not to obscure the utility model.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the utility model. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present utility model, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present utility model.
Example 1
Referring to fig. 1 to 3, an unmanned aerial vehicle gravity center detecting device includes a connecting portion 100 and three gravity detecting portions 2.
The connection portion 100 is used for connecting or abutting on different positions of the unmanned aerial vehicle 1; the three gravity detection portions 2 are respectively connected to one connection portion 100, and are used for detecting the gravity value of the unmanned aerial vehicle 1 at the connection point. By setting the three gravity detection parts 2, the gravity values of three different positions on the unmanned aerial vehicle 1 are obtained, the gravity center position of the unmanned aerial vehicle 1 can be timely calculated through a general formula, the calculation formula can be preset in the user terminal 3 in advance, and three numerical values can be directly input during actual operation.
Specifically, the three gravity detection units 2 are a first detection unit 2a, a second detection unit 2b, and a third detection unit 2c, which are arranged at intervals; the first detecting part 2a is configured to be disposed on a symmetry plane of the unmanned aerial vehicle 1; the second detecting portion 2b and the third detecting portion 2c are respectively disposed symmetrically on both sides of the symmetry plane. The first detection part 2a is arranged on the symmetry plane of the unmanned aerial vehicle 1, the second detection part 2b and the third detection part 2c are respectively arranged on two sides of the symmetry plane and symmetrically arranged, so that the unmanned aerial vehicle gravity center detection device can conveniently determine the pre-examination point of the detection point, and the unmanned aerial vehicle 1 with different sizes can be conveniently detected for a plurality of times. The point of contact between the first detection unit 2a and the unmanned aerial vehicle 1 is defined as point P1, the point of contact between the second detection unit 2b and the unmanned aerial vehicle 1 is defined as point P2, and the point of contact between the third detection unit 2c and the unmanned aerial vehicle 1 is defined as point P3.
The connecting lines among the first detection part 2a, the second detection part 2b and the third detection part 2c form an isosceles triangle, so that the unmanned aerial vehicle 1 can be stably supported conveniently. For example, the point P1 is arranged on the lower side of the nose, the origin of coordinates O is arranged at the front end of the point P1, and the points P2 and P3 are arranged on the lower side of the wing.
On the basis of the above scheme, this embodiment may further be optimized, and the unmanned aerial vehicle gravity center detecting device further includes a level 4, where the level 4 is configured to be disposed on an upper side or a lower side of the unmanned aerial vehicle 1. When setting up the spirit level 4, can fix spirit level 4 on unmanned aerial vehicle 1, also can directly place spirit level 4 in unmanned aerial vehicle 1 upside according to the range size of adjustment.
In some embodiments of the present application, the gravity detecting unit 2 includes a lifter 210 and a checkweigher 220. The top end of the lifter 210 is connected with a connecting part 100 arranged at the lower side of the unmanned aerial vehicle 1; the weighing platform of the checkweigher 220 is connected to the bottom end of the lifter 210, and is used for supporting the unmanned aerial vehicle 1. The lifter 210 is controlled to cooperate with the level 4 to perform leveling, after leveling, the numerical value of the checkweigher 220 is read to obtain a corresponding gravity value, and a mechanism similar to a gold-jack top can be adopted for the lifter, so that the mechanism is fixedly connected with the checkweigher 220.
The upper end of the mechanism is adapted and configured for the connection 100.
Referring to fig. 4, the connection portion 100 may be a threaded hole 100a formed in the unmanned aerial vehicle 1, and a corresponding stud is provided on the top of the lifter 210.
Referring to fig. 5, the tip of the lifter 210 may be a tapered tip, and the connection portion 100 may be a tapered groove 100b of the unmanned aerial vehicle 1 adapted to the tapered tip.
Referring to fig. 6, the connection portion 100 may be provided as a pad 100c that can be fixed to the unmanned aerial vehicle 1, or may be provided with a friction surface on an upper side thereof for abutting against the pad 100c of the unmanned aerial vehicle 1, where the pad 100c is provided with a corresponding straight surface or arc surface on an upper side thereof for corresponding to a nose and a wing of the unmanned aerial vehicle 1 according to different installation positions.
The elevator 210 is first placed in the middle of the checkweigher 220 and then the checkweigher 220 reading is cleared. According to the supporting point position of the unmanned aerial vehicle 1, the three lifters 210 and the corresponding checkweighers 220 are placed below the supporting point of the unmanned aerial vehicle 1, so that the unmanned aerial vehicle 1 can be supported. The level 44 is then placed on the horizontal reference surface of the unmanned aerial vehicle 1, and the unmanned aerial vehicle 1 is adjusted to a horizontal state by adjusting the heights of the three lifters 210. And finally, reading the data of the checkweigher 220, and calculating the mass of the unmanned aerial vehicle 1 to be tested and the mass center in the X, Y direction through a formula.
When in use, referring to fig. 7, three supporting points of the unmanned aerial vehicle 1 need to be designed in advance, the point P1 is positioned in the symmetrical plane of the machine body, and the point P2 and the point P3 are symmetrical with respect to the symmetrical plane of the machine body. The distances X1, X2, Y1, Y2 of points P1, P2, P3 with respect to reference point O are known in design. The lifter 210 main body described above is configured as a conical jack and has a height-adjustable function.
The weight M of the unmanned aerial vehicle 1 is calculated by the following formula:
M P ＝M P1 +M P2 +M P3 . Wherein M is P1 、M P2 、M P3 Checkweigher 220 readings for three support points P1, P2, P3, respectively.
The centroid X of the unmanned aerial vehicle 1 is calculated by the following formula:
X＝(M P1 *X1+(M P2 +M P3 )*X2)/M P
the centroid Y of the unmanned aerial vehicle 1 is calculated by the following formula:
Y＝(M P2 *Y1+M P3 *Y2)/M P
the unmanned aerial vehicle gravity center detection device is simple and reliable in structure, convenient to measure and accurate in result, and can measure the mass of an aircraft and the gravity center of X, Y at the same time.
Example 2
Referring to fig. 8, unlike the embodiment 1, the gravity detecting unit 2 includes a pulling rope 230 and a hanging scale 240, and one end of the pulling rope 230 is connected to a connection unit 100 disposed at an upper side of the unmanned aerial vehicle 1; the hanging hook of the hanging scale 240 is connected to the other end of the pulling rope 230, and is used for hanging the unmanned aerial vehicle 1.
Adopt foretell connecting portion 100 can adopt the lantern ring with the one end of stay cord 230 with the border tie-up of lantern ring can, the bottom midpoint of lantern ring is the strong point, connecting portion 100 can also be the screw hole 100a adaptation bolt on unmanned aerial vehicle 1, this bolt is connected to stay cord 230 one end, the other end is connected with the lifting hook, acquires the gravity value after the leveling through the mode that sets up stay cord 230 and hanging balance 240, can acquire the gravity value and carry out the arrangement of this scheme in inconvenient setting up the supporting mode.
Example 3
Referring to fig. 9, an unmanned aerial vehicle gravity center detection system includes an unmanned aerial vehicle gravity center detection device of embodiment 1 or embodiment 2 and its modification; this unmanned aerial vehicle focus detecting system still includes: the system comprises a data transmission module and a user terminal 3, wherein the data transmission module is connected with a gravity detection part 2 of an unmanned aerial vehicle gravity center detection device; the user terminal 3 is connected to a data transmission module, and is configured to receive the data detected by the gravity detection unit 2. Through adopting this unmanned aerial vehicle focus detecting system, the gravity value that obtains directly inputs user terminal 3 in, and user terminal 3 directly calculates unmanned aerial vehicle 1 focus position.
The user terminal 3 may be a PC, a mobile phone, a smart phone, or the like, and the data transmission module converts the data of the checkweigher 220 and transmits the converted data to the user terminal 3.
In this embodiment, one setting manner may be that the data transmission module includes a serial connector, and the serial connector is disposed on the gravity detection portion 2 and connected to the user terminal 3 through a cable. The checkweigher 220 is an electronic scale, and a serial connector is disposed on the electronic scale, and the serial connector is configured to be connected with the user terminal 3 by a corresponding cable.
Referring to fig. 10, in still another arrangement, the data transmission module includes a bluetooth module, the bluetooth module is disposed on the gravity detection unit 2, and the gravity detection unit 2 is communicatively connected to the user terminal 3 through the bluetooth module. The checkweigher 220 is an electronic scale, and the electronic scale is configured with the bluetooth module for wireless data transmission.
The foregoing detailed description of the utility model has been presented for purposes of illustration and description, and it should be understood that the foregoing is by way of illustration and example only, and is not intended to limit the scope of the utility model.
Claims (10)
1. Unmanned aerial vehicle focus detection device, its characterized in that includes:
the connecting part is used for connecting or abutting on different positions of the unmanned aerial vehicle; and
and the three gravity detection parts are respectively connected with one connecting part and are used for detecting the gravity value of the unmanned aerial vehicle at the connecting point.
2. The unmanned aerial vehicle center of gravity detection device according to claim 1, wherein,
the three gravity detection parts are respectively a first detection part, a second detection part and a third detection part which are arranged at intervals;
the first detection part is used for being arranged on the symmetry plane of the unmanned aerial vehicle;
the second detection part and the third detection part are respectively arranged on two sides of the symmetrical plane and are symmetrically arranged.
3. The unmanned aerial vehicle gravity center detecting apparatus according to claim 2, wherein,
the connecting lines among the first detection part, the second detection part and the third detection part form isosceles triangles.
4. The unmanned aerial vehicle center of gravity detection device according to claim 1, wherein,
the unmanned aerial vehicle further comprises a level, wherein the level is arranged on the upper side or the lower side of the unmanned aerial vehicle.
5. The unmanned aerial vehicle gravity center detecting apparatus according to any one of claims 1 to 4, wherein,
the gravity detection unit includes:
the top end of the lifter is connected with a connecting part arranged at the lower side of the unmanned aerial vehicle;
and the weighing platform of the checkweigher is connected with the bottom end of the lifter and is used for supporting the unmanned aerial vehicle.
6. The unmanned aerial vehicle gravity center detecting apparatus according to any one of claims 1 to 4, wherein,
the gravity detection unit includes:
one end of the pull rope is connected with a connecting part arranged on the upper side of the unmanned aerial vehicle;
and the lifting hook of the hanging scale is connected with the other end of the pull rope and is used for suspending the unmanned aerial vehicle.
7. The unmanned aerial vehicle center of gravity detecting device according to claim 5, wherein,
the top end of the lifter is provided with a stud, and the connecting part is provided with a threaded hole on the unmanned aerial vehicle; or alternatively, the process may be performed,
the top end of the lifter is a conical top, and the connecting part is a conical groove matched with the conical top on the unmanned aerial vehicle; or alternatively, the process may be performed,
the connecting portion is the cushion, the cushion downside sets up the butt joint groove with the top adaptation of riser, and this cushion upside sets up the friction surface that is used for the butt unmanned aerial vehicle.
8. The unmanned aerial vehicle gravity center detection system is characterized in that,
comprising the unmanned aerial vehicle gravity center detection device according to any one of claims 1 to 7;
further comprises:
the data transmission module is connected with the gravity detection part of the unmanned aerial vehicle gravity center detection device;
and the user terminal is connected with the data transmission module and is used for receiving the data detected by the gravity detection part.
9. The unmanned aerial vehicle center of gravity detection system of claim 8, wherein,
the data transmission module comprises:
the serial port connector is arranged on the gravity detection part and is connected with the user terminal through a cable.
10. The unmanned aerial vehicle center of gravity detection system of claim 8, wherein,
the data transmission module comprises:
the Bluetooth module is arranged on the gravity detection part, and the gravity detection part is in communication connection with the user terminal through the Bluetooth module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223398093.7U CN219084300U (en) | 2022-12-12 | 2022-12-12 | Unmanned aerial vehicle focus detection device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223398093.7U CN219084300U (en) | 2022-12-12 | 2022-12-12 | Unmanned aerial vehicle focus detection device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219084300U true CN219084300U (en) | 2023-05-26 |
Family
ID=86390720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223398093.7U Active CN219084300U (en) | 2022-12-12 | 2022-12-12 | Unmanned aerial vehicle focus detection device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219084300U (en) |
-
2022
- 2022-12-12 CN CN202223398093.7U patent/CN219084300U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109794964A (en) | The submissive performance testing device of static state applied to industrial robot | |
| CN103991765B (en) | Balance coefficient of elevator test macro and method | |
| CN107037235B (en) | Soft measurement method and measurement device for brake slip quantity | |
| US4601105A (en) | Vehicle measuring instrument | |
| CN219084300U (en) | Unmanned aerial vehicle focus detection device and system | |
| CN111076865B (en) | Longitudinal gravity center measuring method and device of coaxial helicopter | |
| CN201932851U (en) | Tower type crane and balance detection device thereof | |
| CN114166185A (en) | Building engineering manages and uses multi-functional auxiliary device | |
| CN205642730U (en) | Calibration arrangement for three fens force transducer | |
| CN107782499B (en) | Device and method for measuring mass center of irregular object based on 3D scanner | |
| CN111060269B (en) | Real-time visual measuring device and method for deflection of dynamic and static load test of lifting appliance | |
| CN108759801A (en) | It is suspended automatic to lift and survey automatically high straight line laser system | |
| CN108837429B (en) | Follow-up suspension type low-gravity simulation device for human body measurement and training | |
| CN109163847A (en) | A kind of rotor center of gravity measurement method and its measurement tooling | |
| CN113063577B (en) | Spraying pipe rack with pretightening force and using method | |
| CN211717573U (en) | Novel electronic balance | |
| CN109540385B (en) | One-dimensional centroid measuring device and method based on moment balance principle | |
| CN208653967U (en) | A kind of density self-operated measuring unit | |
| CN212008263U (en) | Device for measuring frictional resistance of horizontal rotating spherical hinge interface | |
| CN211528717U (en) | Automatic adjusting system for microgravity simulation unfolding test equipment | |
| CN114217275A (en) | Automatic leveling system and method for vehicle-mounted slope radar | |
| CN109540387B (en) | Axial centroid measuring device and method based on moment balance principle | |
| CN106989807B (en) | Aircraft weighing system | |
| CN2164038Y (en) | Checking device of brake force test desk | |
| CN207487655U (en) | A kind of horizontal verticality measuring tool of hand-held |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |