CN-224231795-U - Standard speed and acceleration generating device

Abstract

The utility model relates to the technical field of calibration of speed measuring devices, and provides a standard speed and acceleration generating device, which comprises a frame, a driving mechanism, a control mechanism and a shielding object, wherein the frame is provided with a first driving mechanism and a second driving mechanism; the frame comprises a cross beam and a guide rail, the guide rail is fixedly arranged on the cross beam, the driving mechanism comprises a servo motor, a driving wheel, a driving belt, a driven wheel, a sliding block, a first installation seat and a second installation seat, an output shaft of the servo motor is in transmission connection with a central hole of the driving wheel, the driving belt is wound on the driving wheel and the driven wheel, the sliding block is in sliding connection with the guide rail, the sliding block is fixedly connected with the driving belt, the control mechanism comprises a servo control driver, and the shielding object is fixedly arranged on the sliding block. The technical scheme has the beneficial effects or advantages that the test vehicle does not need to be manually driven, the traveling condition of the test vehicle is simulated by using the shielding object, the shielding object moves linearly at the set standard speed and standard acceleration, and the shielding object is used for calibrating the speed measuring device, so that the calibration efficiency is improved.

Inventors

• LAI ZHENGCHUANG
• DAI SHUANGJIAN
• HE CHAOPENG
• Huang Linjin

Assignees

• 福建省计量科学研究院（福建省眼镜质量检验站）

Dates

Publication Date

20260512

Application Date

20250609

Claims (9)

1. 1. A standard speed, acceleration generating device, comprising: the device comprises a frame, a driving mechanism, a control mechanism and a shielding object; the frame comprises a cross beam and a guide rail, and the guide rail is fixedly arranged on the cross beam; The driving mechanism comprises a servo motor, a driving wheel, a driving belt, a driven wheel, a sliding block, a first mounting seat and a second mounting seat, wherein the first mounting seat and the second mounting seat are respectively and fixedly arranged at the front end and the rear end of the cross beam, a machine body of the servo motor is fixedly arranged at the first mounting seat, an output shaft of the servo motor is in transmission connection with a central hole of the driving wheel, the driven wheel is rotatably arranged at the second mounting seat, the driving belt is wound on the driving wheel and the driven wheel, the sliding block is in sliding connection with the guide rail, and the sliding block is also fixedly connected with the driving belt; The control mechanism comprises a servo control driver, and the servo control driver is electrically connected with the servo motor; The shielding object is fixedly arranged on the sliding block.
2. 2. The device for generating standard speed and acceleration according to claim 1, wherein the control mechanism further comprises a first limit switch and a second limit switch, the first limit switch and the second limit switch are respectively and fixedly arranged at the front end and the rear end of the cross beam, and the first limit switch and the second limit switch are electrically connected with the servo control driver.
3. 3. The standard speed, acceleration generating device of claim 1, wherein the control mechanism further comprises a first computer, the first computer being electrically connected to the servo control driver.
4. 4. The device for generating standard speed and acceleration according to claim 1, wherein the frame further comprises a trapezoid column and a connecting plate, the upper ends of the trapezoid columns are fixedly connected with the lower surface of the cross beam, a plurality of trapezoid columns are arranged at intervals along the length direction of the cross beam, and the connecting plate is arranged between two adjacent trapezoid columns.
5. 5. The device for generating standard velocity and acceleration according to claim 4, wherein the frame further comprises a height adjusting assembly, the height adjusting assembly comprises a cup leg and an adjusting bolt, the lower end of the adjusting bolt is fixedly connected with the cup leg, the lower end of the trapezoid pillar is provided with an adjusting screw hole, and the upper end of the adjusting bolt is connected with the adjusting screw hole.
6. 6. The standard speed and acceleration generating device according to claim 1, wherein the driving mechanism further comprises a tensioning shaft, a rolling bearing and a pressing plate, a central hole of the driven wheel is fixedly connected with an outer ring of the rolling bearing, an inner ring of the rolling bearing is fixedly connected with the middle part of the tensioning shaft, horizontal strip-shaped holes are formed in the front side and the rear side of the second mounting seat, two ends of the tensioning shaft are respectively connected with the two horizontal strip-shaped holes in a sliding mode, and two ends of the tensioning shaft are respectively connected with the second mounting seat through the two pressing plates in a fixed mode.
7. 7. The device for generating standard speed and acceleration according to claim 1, further comprising a buffer mechanism, wherein the two buffer mechanisms are fixedly arranged on the first mounting seat and the second mounting seat, respectively, and the sliding block is located between the two buffer mechanisms.
8. 8. A standard speed, acceleration generating device according to claim 1, characterized in, that the cross beam is provided with a hollow structure along its length, through which the drive belt penetrates.
9. 9. The device of claim 1, wherein the shroud is defined by a top plate, a bottom plate, a left plate, and a right plate, the bottom plate being fixedly connected to the slide.

Description

Standard speed and acceleration generating device Technical Field The utility model relates to the technical field of calibration of speed measuring devices, in particular to a standard speed and acceleration generating device. Background The remote sensing detector for motor vehicle tail gas is an important device for detecting motor vehicle tail gas, and is widely adopted by environmental supervision departments as the basis for environmental monitoring and administrative punishment. The remote sensing detector for tail gas of motor vehicle is a measuring system for detecting pollutant discharged by motor vehicle running in a specified speed range by remote sensing under the condition of certain meteorological condition and road gradient. The working principle of the remote sensing detector is that the emitting end of the remote sensing detector host emits light beams, when a motor vehicle passes through, tail gas interferes with the light beams, the characteristics of the spectrum, the intensity and the like of light received by the receiving end can change, and the change can reflect the change of the concentration or the opacity of the measured pollutant. The remote sensing detector for motor vehicle tail gas is mainly composed of pollutant discharge measuring device, speed measuring device, road gradient measuring device, meteorological parameter measuring device, vehicle license plate recognition system, control management computer system, etc. The speed measuring device is used for measuring the running speed of the motor vehicle, the measuring principle is based on the rapid speed measuring principle of a shading method, namely, two photoelectric sensors with equal distance are arranged on a road, when the vehicle passes through the two photoelectric sensors, the two photoelectric sensors can record two time points respectively, and the speed measuring device calculates the running distance and time of the vehicle between the two time points, so that the speed of the vehicle is calculated. The pollutant emission measuring device, the speed measuring device, the road gradient measuring device and the meteorological parameter measuring device are used as measuring devices, and the measuring devices can be used as technical supports for law enforcement after being calibrated by a measuring technical mechanism. At present, according to the national measurement technical regulation JJF 1835-2020, the calibration method of the speed measuring device adopts a standard speedometer method, the standard speedometer is arranged on a test vehicle, the test vehicle uniformly passes through a monitoring area of the speed measuring device of the motor vehicle tail gas remote sensing detector according to the speed value of the corrected speed point, the standard speedometer measures and displays and records the actual speed value when the test vehicle passes through the monitoring area, and meanwhile, the speed measuring device measures the speed of the test vehicle. And comparing the measured speed values of the speed measuring device and the standard speedometer on the test vehicle to obtain the speed indication error of the speed measuring device, namely calibrating the speed measuring device of the motor vehicle tail gas remote sensing detector by using the standard speedometer on the test vehicle. The standard speed meter method has the following problems that (1) a test vehicle is controlled by a driver, the test vehicle is difficult to ensure to run at a constant speed when passing through a monitoring area of a speed measuring device, so that when the test vehicle is calibrated, the speed measured by the speed measuring device and the speed measured by the standard speed meter are difficult to perform one-to-one correspondence, and the speed indication error of the speed measuring device is difficult to accurately calculate, and (2) when the calibration of the acceleration indication error is performed, any three acceleration values in a (-1-2) m/s 2 range are selected as calibration points according to the rule requirements, but one calibration point is required to be smaller than 0m/s 2. However, it is difficult to control the accelerator to ensure that the acceleration of the vehicle is between (-1 to 2) m/s 2 when the vehicle passes through the monitoring area during actual test, and it is still impossible to ensure the repeated measurement of each acceleration calibration point, so that the acceleration indication error is difficult to measure during actual measurement, and (3) when the acceleration indication error calibration is performed, it is also difficult for a driver to control the accelerator to enable the vehicle to perform uniform acceleration movement when the vehicle passes through the monitoring area, that is, the corresponding relation of the acceleration during calibration is difficult to determine, and in sum, it is difficult to control the test vehicle to be in a stable uniform move