CN216815347U - Automobile front axle toe-in value measuring equipment - Google Patents
Automobile front axle toe-in value measuring equipment Download PDFInfo
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- CN216815347U CN216815347U CN202122742420.5U CN202122742420U CN216815347U CN 216815347 U CN216815347 U CN 216815347U CN 202122742420 U CN202122742420 U CN 202122742420U CN 216815347 U CN216815347 U CN 216815347U
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Abstract
The utility model provides a device for measuring a toe-in value of an automobile front axle, which comprises a device for measuring the toe-in value by a laser displacement sensor, a brake drum rotating device, a limit limiting device, a servo motor driving device, a motor for bearing the laser displacement sensor, a brake drum rotating motor, a man-machine interaction unit, a pulse transmission unit, a real-time toe-in value detection unit, a motor origin point returning unit and an electric control system. The utility model adopts the laser displacement sensor to measure the distance between the front edge and the rear edge of the brake drums at the two ends of the front axle in real time, the actually measured toe-in value can be compared with the standard toe-in value in real time and then error correction is continuously carried out until the actually measured toe-in value reaches the standard value, the accuracy of toe-in value measurement is completely ensured, and the measurement module and the correction module are matched to work into a whole, so that the operation is clear and simple, and the measurement is accurate and reliable.
Description
Technical Field
The utility model relates to the field of automobile front axle assembly, in particular to a device for measuring a toe-in value of an automobile front axle.
Background
The toe-in is one of 4 parameters for positioning the front wheel of the automobile, when the front axle is assembled, two brake drums need to be inclined outwards by an angle to form an outward splayed shape, and the difference between the distances of the front edge and the rear edge of the brake drums at two ends of the front axle is the toe-in value. The toe-in value is set for eliminating the bad tendency generated after the camber of the wheel, and the deviation of the automobile or the abrasion of the tire can be caused when the toe-in value does not reach the standard. In recent years, a method for measuring and detecting the automobile front axle toe-in value becomes a research hotspot problem in the automobile field, and a large theoretical research and application research result is obtained.
As for the technology of measuring the toe-in value of the front axle of the automobile, there are mainly measuring methods such as a tape measure method, a positioning plate measure method, a front wheel position finder and the like.
The tape measure method is that the front axle is arranged on a front axle measuring tool, the distance between the front edges of the two brake drums is measured by a tape measure, then the distance between the front edges and the rear edges of the two brake drums is measured by the tape measure, the difference between the rear edge measured value and the front edge measured value is calculated to obtain the toe-in value, the process is relatively simple and convenient, but the toe-in value measuring precision is low, the correction is time-consuming and labor-consuming, the labor cost is high, and the production rate is low.
The method for measuring the positioning plate is characterized in that the positioning plate with a Y-shaped structure is fixed on a hub of an automobile front axle, the method further comprises a detection rod for detecting the distance between the positioning plates, the distance between the front edge and the rear edge of the hub is detected through the detection rod, a toe-in value can be obtained, the method needs complex operations of manufacturing the measuring positioning plate, installing the measuring positioning plate and the like, and the problems of low measuring precision and low efficiency exist.
The measuring method of the front wheel locator adopts two tilt angle sensors, a CCD sensor and a transmitting light source, and needs another angle measuring device during measurement, and the measuring device has simple structure, high manufacturing cost, low precision and poor automation degree.
To date, the above methods still face some common problems to be solved. Such as how to improve the measurement accuracy of the toe-in value of the front axle, how to improve the production efficiency, how to effectively reduce the manufacturing cost, and the like.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The utility model aims to provide a device for measuring a toe-in value of an automobile front axle, and aims to solve the problems of low measurement precision, time and labor waste in correction, low production efficiency, high manufacturing cost and the like in the existing measurement of the toe-in value of the automobile front axle.
The technical scheme of the utility model is as follows:
a measuring device for a toe-in value of an automobile front axle comprises a device for measuring the toe-in value by a laser displacement sensor, a brake drum rotating device, a limit limiting device, a servo motor driving device, a motor for bearing the laser displacement sensor, a brake drum rotating motor, a man-machine interaction unit, a pulse transmission unit, a real-time toe-in value detecting unit, a motor origin point returning unit and an electric control system; the laser displacement sensor device for measuring the toe-in value is connected with the bearing laser displacement sensor motor, the bearing laser displacement sensor device is respectively connected with the laser displacement sensor and the servo motor driving device and is used for measuring the distance value between the front edge and the rear edge of the brake drum to obtain the toe-in value, the brake drum rotating motor is respectively connected with the servo motor driving device and the brake drum and is used for completing the position rotation of the brake drum to match the correction and measurement of the toe-in value, the limit limiting device is respectively connected with the laser displacement sensor measuring device and the brake drum rotating device and is used for controlling the limit position of the motor movement and the searching operation of origin regression, the servo motor driver device is respectively connected with the bearing laser displacement sensor motor and the brake drum rotating motor and is used for sending a driving instruction and receiving feedback information of the servo motor, the electric control system is respectively and electrically connected with the laser displacement sensor toe-in value measuring device, the servo motor driver device, the bearing laser displacement sensor motor, the brake drum rotating motor, the servo motor driving device, the human-computer interaction unit, the pulse transmission unit and the motor origin point returning unit.
The automobile front axle toe-in value measuring equipment is characterized in that the human-computer interaction unit is communicated with the system control board through an MODBUS RTU protocol. A user sets a standard toe-in value, a brake drum left measuring point and a brake drum right measuring point, a left turning standard and a right turning standard, a front axle model, an origin point returning button, an alarm releasing button, a motor selecting button and the like through a man-machine interaction unit, simultaneously displays a left end laser displacement sensor measuring value, a right end laser displacement sensor measuring value and an actually measured toe-in value in real time, and after the system control board receives an operation instruction of the user and meets a starting condition, equipment is started to measure the toe-in value of the front axle of the automobile. Through a friendly man-machine interaction operation interface, a user can select a corresponding front axle model according to actual requirements. The system control board is an ARM Cortex-M series microprocessor, in this embodiment an ARM Cortex-M3 series microprocessor.
The automobile front axle toe-in value measuring equipment comprises a pulse signal generator, a pulse signal differential driving circuit and a pulse signal differential circuit receiving circuit, wherein the pulse signal generator uses a motion control chip MCX314AL as a processor, is respectively connected with a system control board and the pulse signal differential driving circuit and is used for transmitting pulse signals and receiving motor feedback information, the pulse information differential driving circuit adopts an AM26LS31CD chip and is respectively connected with the MCX314AL and a servo motor driver and is used for transmitting driving pulses, the pulse signal differential circuit receiving circuit is respectively connected with the servo motor driver and the MCX314AL and is used for receiving the motor feedback information, and signals passing through the differential circuit always keep a differential form, so that the pulse signals are more stable and accurate.
The automobile front axle toe-in value measuring equipment is characterized in that the toe-in value real-time detecting unit adopts the laser displacement sensor to acquire the positions of the front edge and the rear edge of the brake drum at two ends of the automobile front axle in real time, the brake drum rotating motor rotates the brake drum device and is used for correcting the position of the brake drum to obtain a standard toe-in value, and the toe-in value acquired by the laser displacement sensor is subjected to data processing by the data processing module and then transmits actual toe-in value information to the electric control system in real time.
The automobile front axle toe-in value measuring equipment comprises a data processing module and a laser displacement sensor, wherein the data processing module comprises a level conversion unit, a data bidirectional asynchronous transmission unit and an analog-to-digital conversion (ADC) unit, the level conversion unit is connected with a motion control chip and used for converting 24V voltage into 3.3V voltage, the data bidirectional asynchronous transmission unit is respectively connected with the control panel and the laser displacement sensor, and the analog-to-digital conversion unit is respectively connected with the control panel and the laser displacement sensor and used for converting toe-in value digital signals collected by the laser displacement sensor into electric signals.
The automobile front axle toe-in value measuring equipment is characterized in that the motor origin point returning unit comprises a bearing laser displacement sensor motor origin point and a rotating brake drum motor origin point, the bearing laser displacement sensor motor origin point is that the bearing laser displacement sensor motor is connected with a limit limiting device, when a shading sheet on a laser displacement sensor passes through the origin point, the motor decelerates and continues to move to the origin point to stop, the origin point is the bearing laser displacement sensor motor origin point, the rotating brake drum motor origin point is that after the bearing laser displacement sensor returns to the origin point, the distance between the laser displacement sensor and a brake drum is compared with the distance set by the system, and errors are corrected to enable the rotating brake drum motor to return to the origin point.
The device for measuring the toe-in value of the front axle of the automobile is characterized in that the electric control system comprises a system control board, and a servo motor driving circuit, a power supply circuit, a reset circuit, a limit limiting circuit, a data processing module, a laser displacement sensor, a human-computer interaction unit and a motor origin point returning unit which are respectively and electrically connected with the system control board; the motor driving circuit is respectively connected with the motor for bearing the laser displacement sensor and the brake drum rotating motor, the power circuit is connected with the control system and used for supplying power to the system, the reset circuit is connected with the control panel and used for power-on reset of the system, the limit limiting circuit is respectively connected with the motor for bearing the laser displacement sensor and the brake drum rotating device, the laser displacement sensor is arranged on the motor for bearing the laser displacement sensor, and the human-computer interaction unit is communicated with the system control panel through an MODBUS RTU protocol.
The automobile front axle toe-in value measuring equipment further comprises a system protection unit, wherein the system protection unit comprises an overvoltage protection circuit connected with the control panel and the motion control chip MCX314AL, and an optical coupling isolation chip PS2805-4 is used for optical coupling electrical isolation and level conversion, so that the control panel and the motion control chip are prevented from being burnt out by high level.
The utility model has the beneficial effects that: the automobile front axle toe-in value measuring equipment provided by the utility model adopts the laser displacement sensor to measure the distance between the front edge and the rear edge of the brake drums at two ends of the front axle in real time, the actually measured toe-in value can be compared with the standard toe-in value in real time, and then error correction is continuously carried out until the actually measured toe-in value reaches the standard value, so that the accuracy of toe-in value measurement is completely ensured, and the measuring module and the correcting module are matched to work into a whole, so that the operation is clear and simple, and the measurement is accurate and reliable; in addition, various product types, front axle toe-in value standards and other corresponding buttons are designed in advance through the system and are arranged in the touch screen, and when the device is used, a user only needs to call the model of the front axle on a human-computer interaction interface, so that the device can automatically measure and correct the position of the brake drum to obtain the toe-in value meeting the requirements. An operator only needs to power on the system and select front axle products at the beginning, the whole measuring process is automatically completed by equipment, the degree of automation is high, the system can be used without special training, the operation is simplified to the maximum extent, the labor cost is saved, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of an automobile front axle toe-in value measuring device provided by the utility model.
Fig. 2 is a schematic structural diagram of an electrical control system provided by the present invention.
Fig. 3 is a structural diagram of a pulse transmission unit of a front axle toe value measuring device provided by the utility model.
Fig. 4 is a flowchart of a method for measuring a toe-in value of a front axle of an automobile according to the present invention.
Reference is made to the accompanying drawings in which: 1. a front axle left end brake drum; 2. a limit photoelectric switch; 3. a left end ball screw; 4. a laser displacement sensor; 5. a limit photoelectric switch; 6. the left end bears a servo motor of the laser displacement sensor; 7. sleeving points of the brake drum rotating device; 8. a brake drum rotation device lever; 9. a sector plate; 10. a bearing; 11. a rotating brake drum motor; 12. the right end bears a servo motor of the laser displacement sensor; 13. a limit photoelectric switch; 14. a laser displacement sensor; 15. a limit photoelectric switch; 16. a ball screw at the right end; 17. the brake drum at the left end of the front axle.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model provides an automobile front axle toe-in value measuring device, which comprises a front axle left end brake drum 1, a limit photoelectric switch 2, a left end ball screw 3, a laser displacement sensor 4, a limit photoelectric switch 5, a left end bearing laser displacement sensor servo motor 6, a brake drum rotating device sleeve point 7, a brake drum rotating device pull rod 8, a sector plate 9, a bearing 10, a rotating brake drum motor 11, a right end bearing laser displacement sensor servo motor 12, a limit photoelectric switch 13, a laser displacement sensor 14, a limit photoelectric switch 15, a right end ball screw 16, a front axle left end brake drum 17, a human-computer interaction unit (not shown in the figure) and an electric control system (as shown in fig. 2). The laser displacement sensors 4 and 14 are respectively connected with the motors 6 and 12 of the bearing laser displacement sensors, the devices 3 and 16 of the bearing laser displacement sensors are respectively connected with the laser displacement sensors 6 and 12 and a servo motor driving device (not shown in the figure) and used for measuring the distance value between the front edge and the rear edge of the brake drum to obtain a toe-in value, the brake drum rotating motor 11 is respectively connected with the servo motor driving devices 10, 9, 8 and 7 and used for completing the position rotation of the brake drum to match the correction and measurement of the toe-in value, the limit limiting devices 2, 5, 13 and 15 are respectively connected with the laser displacement sensor measuring devices 4 and 14 and used for controlling the limit position of the motor movement and the searching operation of the motor home-in point, and the servo motor driver device is respectively connected with the motors 6 and 12 of the bearing laser displacement sensors and the brake drum rotating motor 11, the electric control system is respectively electrically connected with the laser displacement sensor toe-in value measuring devices (2, 3, 4, 5 and 13, 14, 15 and 16), the servo motor driver device (not shown in the figure), the bearing laser displacement sensor motors (6 and 12), the brake drum rotating motor 11, the servo motor driving device (not shown in the figure), the human-computer interaction unit (not shown in the figure) and the pulse transmission unit (figure 3).
As shown in fig. 2, in another embodiment of the present invention, the electrical control system includes a system control board, and a servo motor driving circuit, a power circuit, a reset circuit, a limit limiting circuit, a data processing module, a laser displacement sensor and a human-computer interaction unit which are respectively electrically connected to the system control board; preferably, the system control board is an ARM Cortex-M series microprocessor, in this embodiment an ARM Cortex-M3 series microprocessor. The motor drive circuit respectively with bear laser displacement sensor motor and brake drum rotation motor and be connected, power supply circuit is connected with control system for supply power for the system, reset circuit is connected with the control panel electricity for system power-on reset, limit limiting circuit bears the motor with laser displacement sensor respectively and brake drum rotation device is connected, laser displacement sensor bears on the motor at laser displacement sensor, the human-computer interaction unit via MODBUS RTU agreement with system control panel communication. A user sets the model of the front axle of the automobile, the toe-in value standard and the like through the man-machine interaction unit, and the system control board starts the equipment to measure the toe-in value after receiving a user operation instruction and meeting the starting condition. Through a friendly man-machine interaction operation interface, a user can select a toe-in standard value corresponding to a required front axle type according to the requirement of the user, and the standard toe-in value selection range is 1-3mm in actual production.
Preferably, the device for measuring the toe-in value of the front axle of the automobile further comprises a system protection unit, wherein the system protection unit comprises an overvoltage protection circuit connected with the control board and the motion control chip MCX314AL, and an optical coupling isolation chip PS2805-4 is used for optical coupling electrical isolation and level conversion, so that the control board and the motion control chip are prevented from being burnt out by high level.
Preferably, the automobile front axle toe-in value measuring equipment further comprises a data processing module, wherein the data processing module comprises a level conversion unit, a data bidirectional asynchronous transmission unit and an analog-to-digital conversion (ADC) unit, the level conversion unit is connected with the motion control chip and used for converting 24V voltage into 3.3V voltage, the data bidirectional asynchronous transmission unit is respectively connected with the control board and the laser displacement sensors 4 and 14, and the analog-to-digital conversion unit is respectively connected with the control board and the laser displacement sensors and used for converting toe-in value digital signals collected by the laser displacement sensors into electric signals.
Preferably, the automobile front axle toe value measuring device further comprises a motor origin point returning unit, the motor origin point returning unit comprises a bearing laser displacement sensor motor origin point and a rotating brake drum motor origin point, the bearing laser displacement sensor motor origin point is that the bearing laser displacement sensor motor is connected with a limit limiting device, when a shading sheet on a laser displacement sensor passes through a near origin point, the motor decelerates and continues to move to the origin point and stops, the point is the bearing laser displacement sensor motor origin point, the rotating brake drum motor origin point is that the distance between the laser displacement sensor and the brake drum after the bearing laser displacement sensor returns to the origin point is compared with the distance set by the system, as shown in fig. 1, the left end measuring distance L1 is compared with the system set distance L3, the right end measuring distance L2 is compared with the system set distance L4, then rotating the brake drum, and continuously correcting the error by rotating the brake drum by the brake drum motor to meet the condition that L1= L3; and when L2= L4, the position of the motor is the origin of the brake drum rotating motor.
In another embodiment of the present invention, as shown in fig. 3, the pulse transmission unit includes a pulse signal generator, a pulse signal differential driving circuit, and a pulse signal differential circuit receiving circuit, the pulse signal generator uses a motion control chip MCX314AL as a processor, and is respectively connected with a system control board and the pulse signal differential driving circuit, and is used for processing the motor feedback information for transmission and reception of the pulse signal, the pulse information differential driving circuit uses an AM26LS31CD chip and is respectively connected with MCX314AL and a servo motor driver, and is used for transmission of the driving pulse, the pulse signal differential circuit receiving circuit is respectively connected with the servo motor driver and MCX314AL, and is used for receiving the motor feedback information, and the signal after passing through the differential circuit always maintains a differential form, so that the pulse signal is more stable and accurate.
Preferably, the device for measuring the toe-in value of the front axle of the automobile further comprises a real-time toe-in value detection unit, the real-time toe-in value detection unit adopts the laser displacement sensors (4 and 14) to collect the positions of the front edge and the rear edge of the brake drum at the two ends of the front axle of the automobile in real time, the brake drum rotating motor 11 rotates the brake drum rotating device to correct the actual toe-in value, and the toe-in value collected by the laser displacement sensors is subjected to data processing by the data processing module and then transmits the actual toe-in value information to the electric control system in real time.
The utility model also provides a working process corresponding to the device for measuring the toe-in value of the front axle of the automobile, which specifically comprises the following steps as shown in fig. 4:
step 1: powering on the system and starting the system;
step 2: the three servo motors return to the original points, and when the servo motors return to the original points, subsequent operation can be carried out;
and 3, step 3: and measuring the toe-in value in real time, tightening a lock nut when the set standard toe-in value is met, finishing the measuring process, and if the set condition is not met, rotating the brake drum to continue measuring the toe-in value until the set condition is met.
It is to be understood that the utility model is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the utility model as defined in the appended claims.
Claims (8)
1. A measuring device for a toe-in value of an automobile front axle is characterized by comprising a device for measuring the toe-in value by a laser displacement sensor, a brake drum rotating device, a limit limiting device, a servo motor driving device, a motor for bearing the laser displacement sensor, a brake drum rotating motor, a man-machine interaction unit, a pulse transmission unit, a real-time toe-in value detecting unit, a motor origin point returning unit and an electric control system; the device for measuring the toe-in value by the laser displacement sensor is connected with the motor for bearing the laser displacement sensor, the device for bearing the laser displacement sensor is respectively connected with the laser displacement sensor and the servo motor driving device and is used for measuring the distance value between the front edge and the rear edge of the brake drum to obtain the toe-in value, the brake drum rotating motor is respectively connected with the servo motor driving device and the brake drum device and is used for completing the position rotation of the brake drum to match the correction and measurement of the toe-in value, the limit limiting device is respectively connected with the laser measuring device and the brake drum rotating device and is used for controlling the limit position of the motor movement and the searching operation of origin regression, the servo motor driving device is respectively connected with the motor for bearing the laser displacement sensor and the brake drum rotating motor and is used for sending a driving command and receiving feedback information of the servo motor, and the electric control system is respectively connected with the device for measuring the toe-in value by the laser displacement sensor, The servo motor driving device, the motor for bearing the laser displacement sensor, the brake drum rotating motor, the servo motor driving device, the man-machine interaction unit, the pulse transmission unit and the motor return point are electrically connected.
2. The apparatus of claim 1, wherein the human-machine interaction unit communicates with the electrical control system via MODBUS RTU protocol, the electrical control system being a microprocessor STM32F103ZET6 chip of ARM Cortex-M3 series.
3. The automobile front axle toe-in value measuring device according to claim 1, wherein the pulse transmission unit comprises a pulse signal generator, a pulse signal differential driving circuit and a pulse signal differential circuit receiving circuit, the pulse signal generator uses a motion control chip MCX314AL as a processor, is respectively connected with a system control board and the pulse signal differential driving circuit, and is used for transmitting pulse signals and receiving motor feedback information, the pulse signal differential driving circuit adopts an AM26LS31CD chip, and is respectively connected with MCX314AL and a servo motor driver, and is used for driving pulse transmission, and the pulse signal differential circuit receiving circuit is respectively connected with the servo motor driver and MCX314AL, and is used for receiving motor feedback information.
4. The apparatus as claimed in claim 1, wherein the toe value real-time detecting unit uses the laser displacement sensor to collect the positions of the front edge and the rear edge of the brake drum at the two ends of the front axle of the vehicle in real time, and the brake drum rotating motor rotates the brake drum device for correcting the actual toe value.
5. The automobile front axle toe-in value measuring device according to claim 4, further comprising a data processing module, wherein the data processing module comprises a level conversion unit, a data bidirectional asynchronous transmission unit and an analog-to-digital conversion (ADC) unit, the level conversion unit is connected with the motion control chip and used for converting 24V voltage into 3.3V voltage, the data bidirectional asynchronous transmission unit is respectively connected with the control board and the laser displacement sensor, and the analog-to-digital conversion unit is respectively connected with the control board and the laser displacement sensor and used for converting toe-in value digital signals collected by the laser displacement sensor into electric signals.
6. The automobile front axle toe-in value measuring equipment according to claim 1, wherein the electrical control system comprises a system control board, and a servo motor driving circuit, a power supply circuit, a reset circuit, a limit limiting circuit, a data processing module, a laser displacement sensor and a human-computer interaction unit which are respectively and electrically connected with the system control board; the motor driving circuit is respectively connected with the motor for bearing the laser displacement sensor and the brake drum rotating motor, the power circuit is connected with the control system and used for supplying power to the system, the reset circuit is connected with the control panel and used for power-on reset of the system, the limit limiting circuit is respectively connected with the motor for bearing the laser displacement sensor and the brake drum rotating device, and the laser displacement sensor is arranged on the motor for bearing the laser displacement sensor.
7. The apparatus for measuring the toe-in value of the front axle of the automobile according to claim 6, further comprising a system protection unit, wherein the system protection unit comprises an overvoltage protection circuit connected with the control board and the motion control chip MCX314AL, and optical coupling electric isolation and level conversion are carried out by using an optical coupling isolation chip PS 2805-4.
8. The automobile front axle toe-in value measuring equipment as claimed in claim 7, further comprising a motor home point unit, wherein the motor home point unit comprises a bearing laser displacement sensor motor home point and a rotating brake drum motor home point, and the bearing laser displacement sensor motor home point is that the bearing laser displacement sensor motor is connected with a limit limiting device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122742420.5U CN216815347U (en) | 2021-11-10 | 2021-11-10 | Automobile front axle toe-in value measuring equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122742420.5U CN216815347U (en) | 2021-11-10 | 2021-11-10 | Automobile front axle toe-in value measuring equipment |
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| Publication Number | Publication Date |
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| CN216815347U true CN216815347U (en) | 2022-06-24 |
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|---|---|---|---|
| CN202122742420.5U Expired - Fee Related CN216815347U (en) | 2021-11-10 | 2021-11-10 | Automobile front axle toe-in value measuring equipment |
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| CN (1) | CN216815347U (en) |
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2021
- 2021-11-10 CN CN202122742420.5U patent/CN216815347U/en not_active Expired - Fee Related
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Effective date of registration: 20220923 Address after: Yuhua Campus, Yunnan Minzu University, Kunming City, Yunnan Province 650500 Patentee after: YUNNAN MINZU University Address before: 650504 Yunnan University for nationalities, wujiaying street, Chenggong District, Kunming City, Yunnan Province Patentee before: Fan Kangsheng |
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