CN202583047U - Portable pavement friction coefficient measuring device - Google Patents
Portable pavement friction coefficient measuring device Download PDFInfo
- Publication number
- CN202583047U CN202583047U CN 201220228498 CN201220228498U CN202583047U CN 202583047 U CN202583047 U CN 202583047U CN 201220228498 CN201220228498 CN 201220228498 CN 201220228498 U CN201220228498 U CN 201220228498U CN 202583047 U CN202583047 U CN 202583047U
- Authority
- CN
- China
- Prior art keywords
- usb
- chip microcomputer
- key
- box body
- force
- 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.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The utility model discloses a portable pavement friction coefficient measuring device. The device comprises a measuring device box body, a circuit board is arranged in a measuring box body, a longitudinal key, a horizontal key, a power key and a display screen are arranged on the top surface of the measuring box body, a rubber imitating tire is arranged below the bottom surface of the measuring box body, pull rings and counterweight plate inserting slots are respectively arranged on the side surface of the measuring box body, the pull rings are arranged in the middles of the counterweight plate inserting slots, and a memory card inserting slot and a charging hole are formed in the box surface on which the pull rings and the counterweight inserting slots are arranged. A singlechip is arranged on a circuit board in the measuring box body and is connected with a key controller, two acceleration sensors, two force sensors, a display device and a power supply, and the singlechip is also connected with a USB (Universal Serial Bus) flash disc used for storing the data of a storage and collection module in real time by virtue of a USB device. By utilizing the device, the attachment coefficient of a road can be measured accurately, the bidirectional measurement of the portable pavement friction coefficient measuring device is solved, and the data are stored effectively.
Description
Technical field
The utility model relates to pavement skid resistance property detection range, relates in particular to a kind of portable test device for road friction coefficients.
Background technology
Surface friction coefficient is as a very important parameter in the pavement skid resistance property detection range, and extremely people pay attention to.So carrying out the skid resistance analysis of the measurement road pavement of friction factor, correct road pavement has very large effect.
Vertically surface friction coefficient all is an important indicator of estimating pavement skid resistance property with horizontal surface friction coefficient, in traffic accident analysis, also needs accurately to measure the vertical and horizontal surface friction coefficient.The friction factor checkout equipment can be divided into two kinds of fixed-point type friction factor tester and continous way friction factor testers (Continual Friction Measure Equipment) according to the difference of detection mode.The former mainly refers to the swinging friction coefficient appearance BPT (British Pendulum Tester) and the dynamic friction coefficient tester (DFT) of Britain.Its portability is relatively poor, also can't realize continuous storage.CFME can be divided into four kinds of fundamental types: locking wheel type (Locked Wheel Tester), side force type (Side Force Measurement), fixedly slip rate type (Fixed Slip Device) and variable slip rate type (Variable Slip Device).These equipment are trailer-type mostly, also are difficult to realize fast, measure easily.
Summary of the invention
The purpose of the utility model is to provide a kind of portable test device for road friction coefficients.It can effectively solve the single-measurement problem and the data storage problem of portable test device for road friction coefficients.
To achieve these goals, the utility model adopts following technical scheme to be achieved:
A kind of portable test device for road friction coefficients; Comprise the test casing; In the test casing, circuit board is arranged, described test box top has longitudinal key, cross key, power key, display screen, and test tank floor below is provided with imitative rubber tyre; On two vertical each other sides of test casing; Be respectively arranged with first draw ring, the first Weight plate slot, second draw ring, the second Weight plate slot, first, second draw ring lays respectively at the middle part of first, second Weight plate slot, also is provided with storage card slot and charging jack in the side of test casing;
Circuit board in the described test casing includes single-chip microcomputer, on single-chip microcomputer, is connected with button controller, two acceleration transducers, two force transducers, display and power supplys, wherein:
Button controller is connected through serial ports with single-chip microcomputer, and longitudinal key, cross key are selected control; Power key is connected with the power supply of circuit board;
Two acceleration transducers and two force transducers are connected to form data acquisition module through serial ports and single-chip microcomputer, and wherein first force transducer connects first draw ring, and second force transducer connects second draw ring;
The data message of the real-time video data acquisition module of display control display screen;
Single-chip microcomputer is used for the data of real-time storage acquisition module through the USB flash disk on the USB device Connection Card slot.
The utility model also has following other technologies characteristics:
Described two force transducers adopt the CLBS3 pull pressure sensor, can measure pulling force and normal force thereof simultaneously; Said two acceleration transducers adopt the MMA7260QT acceleration transducer.
Described first, second Weight plate slot is used to connect Weight plate.
Described single-chip microcomputer adopts the ATmega16L single-chip microcomputer.
Said USB device is the USB system, comprises usb host and USB peripheral hardware, and said usb host is single chip computer AT mega16L, and said USB is made as USB flash disk outward.
The utility model has compared with prior art solved the bidirectional measurement problem of portable test device for road friction coefficients, and has effectively realized the memory function of data.It is simple and compact for structure, and is easy to carry, and through trying out of applicant, its measuring accuracy is high, and usable range is wide, and is safe and reliable.
Description of drawings
Fig. 1 is the utility model outer profile synoptic diagram.Among Fig. 1,1, longitudinal key; 2, cross key; 3, power key; 4, display screen; 5, first draw ring; 6, the first Weight plate slot; 7, storage card slot; 8, charging jack; 9, imitative rubber tyre, 10, second draw ring, 11, the second Weight plate slot.
Fig. 2 is the hardware system structure synoptic diagram of the utility model.
Fig. 3 is the functional block diagram of device controller SL811HS in the usb host of the utility model.
Fig. 4 is the connection layout of single chip computer AT mega16L of the utility model and the device controller SL811HS in the usb host.
Below in conjunction with accompanying drawing the particular content of the utility model is done further explain.
Embodiment
Referring to Fig. 1 and Fig. 2, present embodiment provides a kind of portable test device for road friction coefficients, comprises the test casing, in the test casing, circuit board is arranged.
The test box top is provided with longitudinal key 1, cross key 2, power key 3 and display screen 4; Test tank floor below is provided with imitative rubber tyre 9; On two vertical each other sides of test casing; Be respectively arranged with first draw ring 5, the first Weight plate slot 6, second draw ring 10, the second Weight plate slot 11; First, second draw ring (5,10) lays respectively at the middle part of first, second Weight plate slot (6,11), also is provided with storage card slot 7 and charging jack 8 in the side of test casing;
Circuit board in the test casing includes single-chip microcomputer, on single-chip microcomputer, is connected with button controller, two acceleration transducers, two force transducers, display and power supplys, wherein:
Button controller is connected through serial ports with single-chip microcomputer, and longitudinal key 1, cross key 2 are selected control; The power supply of power key 3 and circuit board is connected;
Two acceleration transducers and two force transducers are connected to form data acquisition module through serial ports and single-chip microcomputer, and wherein first force transducer connects first draw ring, 5, the second force transducers and connects second draw ring 10;
The data message of display control display screen 4 real-time video data acquisition modules;
Single-chip microcomputer is used for the data of real-time storage acquisition module through the USB flash disk on the USB device Connection Card slot 7.
Imitative rubber tyre 9 is the road contact site of device and road engaged test, the locking situation of tire when being used for the simulated automotive braking.
In the present embodiment, single-chip microcomputer is selected the ATmega16L single-chip microcomputer, and it comprises 8 AVR microprocessors of high-performance, low-power consumption, advanced risc architecture, erasable 10,000 times of the EEPROM of 512 bytes, four-way PWM, 8 tunnel 10 ADC.This monolithic function is selected the acquisition mode of data acquisition module according to the state of button; The data message that real-time reception data acquisition module and storer sent; And these information are handled fast and accurately; Then these real time datas, curve are stored to storer, and the information after display screen output is handled.
Button controller comprises power key, and longitudinal key and cross key, and difference that can be through the manual control button selected the road surface measuring mode, and and then carries out data acquisition through the Single-chip Controlling data acquisition module.
Data acquisition module comprises two force transducers and acceleration transducer.Wherein force transducer adopts the CLBS3 pull pressure sensor, can measure pulling force and normal force thereof simultaneously; Said acceleration transducer adopts the MMA7260QT acceleration transducer, the acceleration of surveying instrument that can be correct, and its acceleration voltage signal is sent into velocity integrator handle, through velocity integrator real-time speed is amassed out, send into single-chip microcomputer and handle.This module has the measurement data acquisition mode of two kinds of surface friction coefficients; A kind of is the data acquisition modes of measuring vertical friction factor; Another kind is an acquisition mode of measuring the side-friction coefficient; Need to select, utilize force transducer and acceleration transducer to carry out real time data after the selection and measure, and import the information that it is measured into the single-chip microcomputer processing according to the difference of user key-press.
In the present embodiment, USB device is the USB system, comprises usb host and USB peripheral hardware; Usb host is single chip computer AT mega16L; USB is made as USB flash disk outward, and the data transmission of any USB all must be initiated and controlled by usb host, and the USB peripheral hardware can only be connected with usb host/device controller; Single-chip microcomputer need carry out the implementing reading and writing storage to USB flash disk through usb host; Device controller in the usb host is SL811HS chip (Fig. 3); It can be used as the interface controller of usb host or equipment; Support usb protocol 1.1, provide at full speed and 2 kinds of usb bus speed of low speed mode, the integrated SRAM of SIE, single port root Hub, USB transceiver and 256 bytes on the sheet; 3.3V WV, interface compatibility 5V voltage, hardware produce frame initial bag SOF and CRC5/16 verification automatically.This module is used the FAT file system, supports the USB flash disk plug and play, the each unlatching of metering system (laterally or vertically), and the module folder of will in USB flash disk, creating a file is set up a digital document then in file.The name of file adopts serial number to arrange, such as, open measurement pattern for the first time after; System creation volume file is called DATA1, then closes after measurement pattern opens this measurement pattern again, and the file of system creation is called DATA2; Never repeat; Avoid data to be capped, and data can not disappear yet behind the powered-down, different metering systems is used the different files name.Afterwards data in the USB flash disk are read out to obtain data on computers.
Power supply can provide stable WV for single-chip microcomputer.
Data message after display can be handled single-chip microcomputer shows through the display screen 4 on the test casing in real time.
Fig. 3 is the functional block diagram of device controller SL811HS in the usb host.SL811HS can support the USB control chip of data transmission at full speed, and this chip adopts 28 pin PLCC and two kinds of packing forms of 48 pin TQFP, and includes the master/slave controller of USB, supports the full-speed/low-speed data transmission, and can discern low speed or full speed equipment automatically.The interface that SL811HS provided is deferred to USB 1.1 standards, and processor interface provides data, address and control signal wire, conveniently is connected with single-chip microcomputer, DSP and embedded microprocessor, and receives the control of CPU.Interruptable controller is through detecting the state variation of various usb bus, as equipment connect waking up of people, equipment Suspend Mode etc., and, can understand the state of equipment through detecting interrupt status register with the performance of interruption form.RAM provides the buffer zone of data storage on the one hand, has defined various registers on the other hand again and has been used to control SL811HS, and outside CPU just can understand state and the relevant information of USB through visiting these registers.SIE realize data also, the string conversion.Integrated root Hub provides the tie point of USB device.It is that SL811HS provides clock that the clock generator module needs external crystal oscillator.
Fig. 4 is the connection layout of the device controller SL811HS in usb host single chip computer AT mega16L and the usb host.SL811HS is the system of 3.3V power supply, and ATmega16L is the system of 5V power supply, but the port of the two compatible the other side's high-low level each other.So data pin D0 ~ D7 of SL81lHS is direct and low eight bit address of single-chip microcomputer; Data bus pins PA0 ~ PA7 connects; Read-write strobe pin nRD, nWR then directly with the read-write line/RD of single-chip microcomputer ,/WR connects, the ATmega16L single-chip microcomputer arrives the buffer zone reading of data of SL811HS inside through interface; Divide two steps: earlier A0 is put 0, carry out write address through 8 bit address/data multiplex line; Again A0 is put 1, through 8 bit address/data multiplex alignment buffer area read-write data.M/S pin ground connection behind pull down resistor of SL8l1HS makes it work in the console controller pattern.In addition, the interrupt request singal of SL8l1HS is that high level is effective, is connected to external interrupt pin/INT0 of ATmega16L after then reverse.Native system does not adopt the inner phaselocked loop of SL811HS, directly uses the outside active crystal oscillator of 48MHz as the clock source.Memory module is a host computer system, on its pcb board socket is installed, and is used to USB flash disk tie point is provided.
Claims (5)
1. a portable test device for road friction coefficients comprises the test casing, in the test casing, circuit board is arranged, and it is characterized in that:
Described test box top has longitudinal key (1), cross key (2), power key (3), display screen (4); Test tank floor below is provided with imitative rubber tyre (9); On two vertical each other sides of test casing; Be respectively arranged with first draw ring (5), the first Weight plate slot (6), second draw ring (10), the second Weight plate slot (11); First, second draw ring (5,10) lays respectively at the middle part of first, second Weight plate slot (6,11), also is provided with storage card slot (7) and charging jack (8) in the side of test casing;
Circuit board in the described test casing includes single-chip microcomputer, on single-chip microcomputer, is connected with button controller, two acceleration transducers, two force transducers, display and power supplys, wherein:
Button controller is connected through serial ports with single-chip microcomputer, and longitudinal key (1), cross key (2) are selected control; Power key (3) is connected with the power supply of circuit board;
Two acceleration transducers and two force transducers are connected to form data acquisition module through serial ports and single-chip microcomputer, and wherein first force transducer connects first draw ring (5), and second force transducer connects second draw ring (10);
Display control display screen (4) is the data message of video data acquisition module in real time;
Single-chip microcomputer is used for the data of real-time storage acquisition module through the USB flash disk on the USB device Connection Card slot (7).
2. portable test device for road friction coefficients as claimed in claim 1 is characterized in that, described two force transducers adopt the CLBS3 pull pressure sensor, can measure pulling force and normal force thereof simultaneously; Said two acceleration transducers adopt the MMA7260QT acceleration transducer.
3. portable test device for road friction coefficients as claimed in claim 1 is characterized in that, described first, second Weight plate slot (6,11) is used to connect Weight plate.
4. portable test device for road friction coefficients as claimed in claim 1 is characterized in that, described single-chip microcomputer adopts the ATmega16L single-chip microcomputer.
5. portable test device for road friction coefficients as claimed in claim 1 is characterized in that said USB device is the USB system, comprises usb host and USB peripheral hardware, and said usb host is single chip computer AT mega16L, and said USB is made as USB flash disk outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228498 CN202583047U (en) | 2012-05-21 | 2012-05-21 | Portable pavement friction coefficient measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228498 CN202583047U (en) | 2012-05-21 | 2012-05-21 | Portable pavement friction coefficient measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202583047U true CN202583047U (en) | 2012-12-05 |
Family
ID=47252448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220228498 Withdrawn - After Issue CN202583047U (en) | 2012-05-21 | 2012-05-21 | Portable pavement friction coefficient measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202583047U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706799A (en) * | 2012-05-21 | 2012-10-03 | 长安大学 | Portable device and method for testing friction coefficient of pavement |
| CN109507105A (en) * | 2018-11-16 | 2019-03-22 | 长安大学 | A kind of road antiskid Performance Test System and its test method |
| CN110031396A (en) * | 2019-04-25 | 2019-07-19 | 河海大学常州校区 | A kind of confficient of static friction measuring device and method |
-
2012
- 2012-05-21 CN CN 201220228498 patent/CN202583047U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706799A (en) * | 2012-05-21 | 2012-10-03 | 长安大学 | Portable device and method for testing friction coefficient of pavement |
| CN102706799B (en) * | 2012-05-21 | 2014-12-03 | 长安大学 | Portable device and method for testing friction coefficient of pavement |
| CN109507105A (en) * | 2018-11-16 | 2019-03-22 | 长安大学 | A kind of road antiskid Performance Test System and its test method |
| CN109507105B (en) * | 2018-11-16 | 2021-06-15 | 长安大学 | Road anti-skid performance test system and test method thereof |
| CN110031396A (en) * | 2019-04-25 | 2019-07-19 | 河海大学常州校区 | A kind of confficient of static friction measuring device and method |
| CN110031396B (en) * | 2019-04-25 | 2021-08-24 | 河海大学常州校区 | Static friction coefficient measuring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102706799B (en) | Portable device and method for testing friction coefficient of pavement | |
| CN202583047U (en) | Portable pavement friction coefficient measuring device | |
| Karpov et al. | Designing the platform for monitoring and visualization orientation in Euler angles | |
| CN103150929A (en) | Magnetic field sensor-based vehicle parking state detection system | |
| CN202994144U (en) | Digital inclinator based on accelerometer | |
| CN202149871U (en) | Liquid density detection device | |
| CN202869645U (en) | Portable vibration measuring instrument based on Android platform mobile phone | |
| CN204457747U (en) | A kind of measurement mechanism of bit angle | |
| CN203704915U (en) | Digital wireless inclination angle measuring instrument | |
| CN204924842U (en) | Portable mining blow detector | |
| CN102607509A (en) | Method and device for measuring attitude dip angle of moving carrier based on floating point type DSP (digital signal processor) | |
| CN103383254A (en) | Ship-swaying dip angle measuring instrument | |
| CN201334903Y (en) | Indicator diagram and liquid level comprehensive test instrument | |
| CN102889915B (en) | Flowmeter and calorimeter asynchronous metering and detecting method and detecting system based on communication | |
| CN207894427U (en) | A kind of vehicle movement parameters measuring system | |
| CN203069179U (en) | Ultra-low power consumption dipmeter | |
| Liao et al. | Mixed traffic information collection system based on pressure sensor | |
| CN204347062U (en) | Cup type air velocity transducer threshold wind velocity check system | |
| CN202582600U (en) | Intelligent type reading instrument | |
| Hu et al. | STM32-Based Design of Racecar Running Status Monitoring System and Instrument Display | |
| CN204649977U (en) | Seismic intensity self-operated measuring unit | |
| CN205748687U (en) | Temperature hot-fluid is wireless scan tester | |
| CN202710601U (en) | Multifunctional acceleration motion measuring instrument | |
| CN204128735U (en) | One locates barograph automatically | |
| CN203259639U (en) | Helium optical pumping magnetometer data processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121205 Effective date of abandoning: 20141203 |
|
| RGAV | Abandon patent right to avoid regrant |