CN213209471U - Rolling brake measuring device - Google Patents
Rolling brake measuring device Download PDFInfo
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- CN213209471U CN213209471U CN202021443664.2U CN202021443664U CN213209471U CN 213209471 U CN213209471 U CN 213209471U CN 202021443664 U CN202021443664 U CN 202021443664U CN 213209471 U CN213209471 U CN 213209471U
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- wheel
- speed measuring
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Abstract
The utility model relates to a rolling braking measuring device, including arrestment mechanism and display mechanism, arrestment mechanism includes drum assembly, drive assembly. The roller assembly comprises a driving roller, a driven roller and a speed measuring roller, wherein the driving roller and the driven roller are arranged side by side at intervals, the speed measuring roller is arranged between the driving roller and the driven roller, and the driving roller and the driven roller support the outer ring of the automobile. The driving component drives the driving roller to rotate, and the driving roller drives the driven roller and the wheels to synchronously rotate. The upper and lower position of the speed measuring roller is adjustably supported against the bottom of the wheel to be driven by the wheel to rotate, and the speed measuring roller is provided with a speed measuring sensor to measure the rotation condition of the wheel. The display mechanism comprises a control circuit board which is in communication connection with the driving assembly and the speed measuring sensor so as to receive signals and send control instructions. The rolling brake measuring device can be used as a metering device which is independently operated to complete the detection of the brake items of the wheels, is provided with a display mechanism and displays test data in real time.
Description
Technical Field
The utility model relates to a vehicle braking measurement field, more specifically say, relate to a rolling braking measuring device.
Background
Among the automobile safety performance testing items, the brake performance test is a very important item. The braking performance is directly related to the driving safety of the automobile, so that good braking performance is an important guarantee for the safe driving of the automobile. Common braking force detection methods include a road test method and a bench test method. In the prior art, a commonly used brake test bed is divided into 3 types, namely a roller reaction type brake test bed, a flat plate type brake test bed and an inertia type brake test bed.
The drum reaction type brake table detects the braking performance of the vehicle by measuring the reaction force of the wheel braking force acting on the force measuring drum.
The current national standard GB7258 of Motor vehicle operation safety technical Condition stipulates: if the braking force measured by the automobile on the braking inspection table meets the condition that the ratio of the total sum of the braking force and the weight of the whole automobile is more than 60% when the automobile is unloaded and more than 50% when the automobile is fully loaded, the ratio of the shaft braking force of the main bearing shaft and the shaft load of the shaft meets the condition that the ratio is more than 60% when the automobile is unloaded and more than 50% when the automobile is fully loaded, the braking performance of the detected automobile is qualified.
The national standard GB211061 'Motor vehicle safety and technology inspection project and method' stipulates: the motor vehicle brake inspection is preferably carried out by using a roller reaction type brake inspection bench or a flat plate brake inspection bench, and the brake bench with corresponding bearing capacity is selected according to the axle load of the inspected vehicle.
In the State quality inspection administration supervision and management method of Motor vehicle safety inspection organization (State quality inspection administration No. 121) and corresponding qualification approval technical conditions of Security inspection organization, the equipment configuration of a motor vehicle detection line is definitely required: the digital secondary instrument is adopted and is provided with a data communication interface, so that networking control can be realized. "
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that, a rolling braking measuring device is provided.
The utility model provides a technical scheme that its technical problem adopted is: constructing a rolling braking measuring device, which comprises a braking mechanism and a display mechanism, wherein the braking mechanism comprises a roller assembly and a driving assembly;
the roller assembly comprises a driving roller, a driven roller and a speed measuring roller, wherein the driving roller and the driven roller are arranged side by side at intervals, and the speed measuring roller is arranged between the driving roller and the driven roller;
the driving assembly drives the driving roller to rotate, and the driving roller drives the driven roller and the wheels to synchronously rotate;
the speed measuring roller is adjustably abutted against the bottom of the wheel to be driven by the wheel to rotate, and a speed measuring sensor is arranged on the speed measuring roller to measure the rotation condition of the wheel;
the display mechanism comprises a control circuit board which is in communication connection with the driving assembly and the speed measuring sensor so as to receive signals and send control instructions.
Preferably, the driving assembly comprises a motor and a speed reducer connected between the motor output shaft and the driving roller, and the motor is in communication connection with the control circuit board.
Preferably, the braking mechanism further comprises a load cell for measuring the braking force transmitted to the speed reducer by the wheel when the wheel is braked, and the load cell is in communication connection with the control circuit board.
Preferably, the load cell is measured by a load lever connected to the retarder housing.
Preferably, the braking mechanism further comprises a displacement sensor for monitoring the displacement of the braking mechanism in the height direction in real time, and the displacement sensor is in communication connection with the control circuit board.
Preferably, the displacement sensors are mounted at both left and right ends of the braking mechanism.
Preferably, the brake mechanism further comprises an in-position photoelectric switch for detecting whether a wheel enters the roller assembly, and the in-position photoelectric switch is in communication connection with the control circuit board.
Preferably, the in-place photoelectric switch is arranged on one side of the roller assembly.
Preferably, the rolling braking measurement device further comprises a weighing frame for mounting the braking mechanism, a weighing sensor arranged on the lower side of the weighing frame, and a lifting mechanism for lifting the weighing frame, wherein the weighing sensor and the lifting mechanism are respectively in communication connection with the control circuit board.
Preferably, the rolling brake measuring device comprises two sets of brake mechanisms, which respectively measure two wheels of the vehicle.
Implement the utility model discloses a rolling braking measuring device has following beneficial effect: the rolling brake measuring device can be used as a metering device which is independently operated to complete the detection of the brake items of the wheels, is provided with a display mechanism and displays test data in real time.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a rolling braking measurement device in an embodiment of the present invention;
FIG. 2 is a diagram of the hardware connections and data routing of the control circuit board.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the rolling braking measuring device in a preferred embodiment of the present invention includes a braking mechanism and a display mechanism 8, wherein the braking mechanism includes a roller assembly and a driving assembly.
The roller assembly comprises a driving roller 3, a driven roller 4 and a speed measuring roller 5, wherein the driving roller 3 and the driven roller 4 are arranged side by side at intervals, the speed measuring roller 5 is arranged between the driving roller 3 and the driven roller 4, and the driving roller 3 and the driven roller 4 support the outer ring of the wheel of the automobile.
The driving component drives the driving roller 3 to rotate, and the driving roller 3 drives the driven roller 4 and the wheels to synchronously rotate;
the upper and lower positions of the speed measuring roller 5 are adjustably abutted against the bottom of the wheel so as to be driven by the wheel to rotate, and the speed measuring roller 5 is provided with a speed measuring sensor 6 so as to measure the rotation condition of the wheel;
preferably, the rolling brake measuring device includes two sets of brake mechanisms, which respectively measure the left and right wheels of the detected axle of the vehicle.
During detection, a detected automobile drives on the brake mechanism, and two wheels on a detected shaft of the automobile can be respectively positioned between the driving roller 3 and the driven roller 4 of the roller assemblies of the left brake mechanism and the right brake mechanism.
The driving assembly comprises a motor 1 and a speed reducer 2 connected between an output shaft of the motor 1 and a driving roller 3, the driving roller 3 is driven to drive wheels to rotate, the driving roller 3 is connected with a driven roller 4 through chains, gears or belt transmission, and the driving roller 3 can drive the driven roller 4 to rotate.
The speed measuring roller 5 is arranged between the driving roller 3 and the driven roller 4 of the same group of braking mechanisms, has small diameter, can rotate and float up and down to adjust the up-down position, and is kept at the highest position by a spring at ordinary times.
Because the speed measuring sensor 6 is arranged on the speed measuring roller 5, during inspection, the wheel of the detected vehicle is arranged on the driving roller 3 and the driven roller 4, the speed measuring roller 5 is pressed down and keeps reliable contact with the wheel, and the control device can obtain the rotation condition of the detected wheel through the speed measuring sensor 6.
The display mechanism 8 comprises a display screen 801, a box body 802 and a control circuit board, wherein the display screen 801 is arranged on the outer surface of the box body 802, the box body 802 is arranged at a proper position beside the brake mechanism, the control circuit board is arranged in the box body 802, the control circuit board is provided with a control circuit, and the display screen 801 can be one of a dot matrix screen, an LCD/LED display screen and a touch screen.
The control circuit board can be in communication connection with the driving assembly and the speed measuring sensor 6 so as to receive signals and send control instructions.
The rolling brake measuring device can be used as a metering device which is independently operated to complete the detection of the brake items of the wheels, is provided with a display mechanism and displays test data in real time.
The brake mechanism further comprises a load cell 7 for measuring the braking force of the wheel transmitted to the retarder 2 when the wheel is braked, the load cell 7 being in communication with the control circuit board, preferably the load cell 7 being measured by a load lever connected to the housing of the retarder 2.
The brake mechanism also comprises a displacement sensor used for monitoring the displacement of the brake mechanism in the height direction in real time, the displacement sensor is in communication connection with the control circuit board, and preferably, the displacement sensor is arranged at the left end and the right end of the brake mechanism.
The braking mechanism further comprises an in-place photoelectric switch used for detecting whether the wheels enter the roller assembly, the in-place photoelectric switch is in communication connection with the control circuit board, and the in-place photoelectric switch is arranged on one side of the roller assembly.
The rolling braking measuring device further comprises a weighing frame 9 for mounting the braking mechanism, a weighing sensor 10 arranged on the lower side of the weighing frame, and a lifting mechanism 11 for lifting the weighing frame, wherein the weighing sensor 10 and the lifting mechanism 11 are respectively in communication connection with the control circuit board.
The hardware connections and data flow of the control circuit board are shown in fig. 2.
In this embodiment of the system, the Micro Control Unit (MCU) of the system control circuit board may be a single chip microcomputer with embedded 8051, ARM, etc. general purpose cores, and its interior has on-chip flash memory (ROM), Random Access Memory (RAM), and Electrically Erasable Programmable Read Only Memory (EEPROM), an integrated a/D converter, a pulse counter, an external embedded network card chip, and provides a series of complete system peripherals and interfaces.
Millivolt-level voltage signals output by sensors for measuring force, weighing, displacement and the like are converted into standard analog quantity voltage signals of 0-5V and the like after being conditioned by signals such as amplification, filtering, potential translation and the like of a signal conditioning circuit, are sent into an analog port of the MCU for AD sampling, and are converted into digital signals through an A/D converter;
in the embodiment, a piecewise linear calibration method is selected to divide the input signal into a plurality of sections, calibration is performed in each inter-cell range according to an approximate linear relationship, and a calibration result is stored in the EEPROM of the MCU.
The display screen 801, the indicator light, the alarm and the human-computer interaction equipment are all connected with the general I/O interface of the MCU. The display screen 801 displays and prompts correspondingly, the detection indicator lamp is used for commanding a driver to operate the automobile to drive, the alarm is used for preventing measurement results from being wrong, and human-computer interaction equipment such as a keyboard, a touch screen and the like is used for interacting and judging input instructions.
The system software of the MCU can select 8051, Linux and other embedded single chip microcomputer operating systems, and the software modules comprise: a hardware device driver and an embedded Web server; and in the programming process, the hardware drive and the Web server source code are crossly compiled on an external PC machine through a crossly compiling environment.
All hardware equipment in the embedded single-chip microcomputer system is treated as files, a driver provides a mechanism for safely opening and closing equipment files, and when accessing hardware needing to be controlled in software, the driver of the hardware equipment is required to be called first.
The Web server of the embedded Ethernet chip integrates the functions of field equipment information acquisition and information release, is based on a TCP/IP bottom layer communication protocol, can provide an operation and control interface of equipment for any Web browser user legally accessing the network where the Web browser is located, and is communicated with the Web browser through an HTTP protocol.
The detection principle of the brake table is as follows:
during detection, a control system on the display mechanism 8 starts a detection program according to vehicle registration information and inspector information provided by a Web browser user; guiding a detected automobile to run on a brake mechanism, stopping wheels on a roller component, sending an interrupt signal by an in-place photoelectric switch, starting a lifting mechanism 11 in place and weighing, driving a driving roller 3 to drive the wheels to rotate by a motor 1, prompting a test driver to step on a brake pedal urgently according to a control system after the rotating speed of the wheels is stable, continuously driving the driving roller 3 to rotate by the motor 1, applying a torque opposite to the braking torque to the wheels, outputting an electric signal proportional to the braking force by a force transducer 7 under the stress, and enabling a speed measuring roller 5 to be in contact with the wheels and the rotating speed to be equal to the rotating speed of the wheels in real time; when the wheel to be detected is braked and the rotating speed is reduced to be close to locking, the control device enables the driving motor 1 to stop rotating according to the corresponding electric signal sent by the speed measuring sensor 6 so as to prevent the roller component from peeling off the tire and protect the driving motor 1, the rotating speed signal can also be used for measuring the slip rate, and the slip rate refers to the ratio of the rotating speed reduction value of the wheel after the brake pedal is stepped on to the rotating speed value of the wheel when the brake pedal is not stepped on.
The detection principle of the roller reaction type brake test bed is shown. When the roller reaction type brake detection platform detects, the automobile does not move, and the rollers drive the wheels to rotate, so that the static detection is realized.
The detection process comprises the following steps:
(1) firstly, a Web browser user provides information (license plate number, detection type, vehicle type, axle number and the like) of a detected vehicle and information of a tester and then starts a detection program; the Web browser user can be any legal user accessing a network where the secondary instrument is located, such as a detection line main control computer, a service terminal, a mobile terminal and the like;
(2) the detected vehicle runs straight and centered according to the prompt of the detection indicator lamp, wheels are arranged between the driving roller 3 and the driven roller 4, the transmission is arranged in a neutral gear, and a brake pedal is released;
(3) the in-place photoelectric switch sends out an in-place signal to the control system after detecting that the wheel enters the roller assembly, the display screen 801 prompts the vehicle to be in place, the lifting mechanism 11 lifts the brake mechanism according to a set detection program, when the shutdown condition according with GB21861 is met, the lifting is stopped, and the weighing sensor 10 of the weighing mechanism detects the axle load of the detected axle of the detected vehicle under the current condition;
(4) starting a motor 1 of a driving device to drive a roller assembly to rotate, starting sampling after stabilizing for several seconds and keeping enough sampling time, measuring an average value in the sampling process as a retarding force, a test driver gradually steps on a brake pedal to the bottom or steps on the brake pedal force specified in brake performance test according to the indication of a display screen 801, measuring the numerical value of the whole process of the brake force increase of the left wheel and the right wheel and the maximum brake force of the left wheel and the right wheel, sequentially testing each axle, operating a parking brake operating device on a parking brake shaft, and measuring the parking brake force numerical value. Calculating the braking rate, the difference percentage of the braking force of the left wheel and the right wheel, the braking rate of the whole vehicle and the percentage of the parking braking force of each axle;
(5) and after the detection is finished, lowering the brake detection table to prompt the vehicle to exit the detection area.
It is to be understood that the above-described respective technical features may be used in any combination without limitation.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A rolling braking measuring device is characterized by comprising a braking mechanism and a display mechanism (8), wherein the braking mechanism comprises a roller assembly and a driving assembly;
the roller assembly comprises a driving roller (3) and a driven roller (4) which are arranged side by side at intervals, and a speed measuring roller (5) arranged between the driving roller (3) and the driven roller (4), wherein the driving roller (3) and the driven roller (4) support the outer ring of the wheel of the automobile;
the driving component drives the driving roller (3) to rotate, and the driving roller (3) drives the driven roller (4) and the wheels to synchronously rotate;
the speed measuring roller (5) is vertically and adjustably abutted against the bottom of the wheel so as to be driven by the wheel to rotate, and a speed measuring sensor (6) is arranged on the speed measuring roller (5) so as to measure the rotation condition of the wheel;
the display mechanism (8) comprises a control circuit board which is in communication connection with the driving assembly and the speed measuring sensor (6) so as to receive signals and send control instructions.
2. The rolling brake measurement device according to claim 1, wherein the drive assembly comprises a motor (1) and a reducer (2) connected between an output shaft of the motor (1) and the driving drum (3), the motor (1) being in communication with the control circuit board.
3. The rolling brake measurement device according to claim 1, characterized in that the braking mechanism further comprises a load cell (7) for measuring the braking force of the wheel transmitted to the retarder (2) when the wheel is braked, the load cell (7) being in communication connection with the control circuit board.
4. Rolling brake measuring device according to claim 3, characterized in that the load cell (7) is measured by a load lever connected to the housing of the retarder (2).
5. The rolling brake measurement device of claim 1, wherein the brake mechanism further comprises a displacement sensor for monitoring the displacement of the brake mechanism in the height direction in real time, and the displacement sensor is in communication connection with the control circuit board.
6. The rolling brake measurement device of claim 5, wherein the displacement sensors are mounted at both left and right ends of the brake mechanism.
7. The rolling brake measurement device of claim 1, wherein the brake mechanism further comprises an in-position photoelectric switch for detecting whether a wheel enters the drum assembly, the in-position photoelectric switch being communicatively coupled to the control circuit board.
8. The rolling brake measurement device of claim 7, wherein the home position photoelectric switch is disposed on a side of the drum assembly.
9. The rolling brake measurement device according to any one of claims 1 to 8, further comprising a weighing frame (9) for mounting the brake mechanism, a weighing sensor (10) arranged on the lower side of the weighing frame, and a lifting mechanism (11) for lifting the weighing frame, wherein the weighing sensor (10) and the lifting mechanism (11) are respectively in communication connection with the control circuit board.
10. A rolling brake measurement device according to any one of claims 1 to 8, wherein the rolling brake measurement device comprises two sets of brake mechanisms, each measuring two wheels of the vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021443664.2U CN213209471U (en) | 2020-07-21 | 2020-07-21 | Rolling brake measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021443664.2U CN213209471U (en) | 2020-07-21 | 2020-07-21 | Rolling brake measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213209471U true CN213209471U (en) | 2021-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021443664.2U Active CN213209471U (en) | 2020-07-21 | 2020-07-21 | Rolling brake measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213209471U (en) |
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2020
- 2020-07-21 CN CN202021443664.2U patent/CN213209471U/en active Active
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