CN2180989Y - Portable brake driving mechanism proterty checking and testing apparatus - Google Patents
Portable brake driving mechanism proterty checking and testing apparatus Download PDFInfo
- Publication number
- CN2180989Y CN2180989Y CN 93245198 CN93245198U CN2180989Y CN 2180989 Y CN2180989 Y CN 2180989Y CN 93245198 CN93245198 CN 93245198 CN 93245198 U CN93245198 U CN 93245198U CN 2180989 Y CN2180989 Y CN 2180989Y
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- pressure transducer
- driving mechanism
- circuit
- detector
- sensor
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- Force Measurement Appropriate To Specific Purposes (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The utility model relates to a portable brake driving mechanism performance checking and testing apparatus, which comprises a sensor, a signal collecting, converting, operating, inputting and outputting circuit controlled by a single-chip computer and an output display device. A circuit signal trigger switch is installed on a brake pedal; a sensor is a pressure sensor mutually connected with a hydraulic oil pipe. The portable brake driving mechanism performance checking and testing apparatus adopts the SCM technology to record the transient process of the pressure of the hydraulic system of the brake driving mechanism along with time changes in the vehicle brake process under the support of software. Thus, the performance parameter of the brake driving mechanism can be reckoned up.
Description
The utility model belongs to the instrument of heavy-duty car and other engineering machinery braking system braking drive organ Performance Detection.
Existing automobile brake perfrmance detection method mainly contains two kinds, and a kind of is the bench test method, and a kind of is road test method.
The bench test method is on the brake tester of special use, measures the braking moment of each wheel.There are two problems in this method: (1) for the heavy type mining automobile: the maximum at present greatest axis load that brake tester allowed is 10000kg, and the mine truck of dead weight capacity more than 27 tons, back axle load surpasses 10000kg when unloaded.(2): brake tester can only detect the braking moment of each wheel, can't detect performance parameters such as braking response time, brake coordination time, and these parameters are very big to the length influence of braking distance.
Road test method is with the actual braking procedure medium velocity of fifth wheel instrument registration of vehicle and the relation of time relation and speed and distance.Or measure the parameters such as maximum deceleration of vehicle in the braking procedure with the retarded velocity instrument.Also there are two problems in this method: (1) for the heavy type mining automobile: actual road test road pavement condition and car brakeing initial velocity have certain requirement, and most of scenes can't reach this requirement.Mine truck is not owing to super wide, superelevation, allow highway again, and in fact the braking ability with road test method detection mine truck is difficult to carry out.(2): actual road test can only detect the braking ability of gross vehicle, can't detect the damping force of each wheel, and the damping force that particularly can't detect left and right wheels is poor, so can not solve the brake side-slipping problem.
Still there be not a kind of heavy type mining automobile brake perfrmance detection, particularly on-the-spot on-line detection method and instrument of being suitable in the prior art.
Braking system is made up of the two large divisions, and a part is a wheel drag, and another part is a braking drive organ.According to data and field statistics, in the fault of braking system, the fault of braking drive organ accounts for 90%.The time dependent transient process of the pressure of braking drive organ hydraulic system in the registration of vehicle braking procedure just can calculate the performance parameter of braking drive organ, also just can solve the detection problem to brake pump basically.
The purpose of this utility model is to propose a kind of portable braking ability detecting instrument technical scheme, can not travel in the automobile original place, does not go up under the situation of testing table, detects the performance parameter and the fault of braking drive organ.
Content of the present utility model comprises: sensor, and by signals collecting, conversion, computing and input, output circuit and an output display device of a computer on-slice control, the circuit signal trigger switch is installed on the braking footrest; Sensor is the pressure transducer that joins with hydraulic oil pipe, the external clamping type pressure transducer that pressure transducer is made up of piezoelectric crystal and positioning fixture, piezoelectric crystal and hydraulic pressure tube wall directly are abutted against, positioning fixture is the removable jew clip, comprise a pair of clamp, clamp one end connects with bearing pin, the other end has the screw of relative perforation, the female screw of available butterfly connects, but the section opposite position has the symmetrical grooves of proper covering liquid pressuring oil pipe outer wall in two clamps, and the groove inwall is lined with cushion, and piezoelectric crystal has two, crouch on cushion in its position embedding relatively respectively, pressure transducer is the plug-in type pressure transducer; The testing circuit structure is: sensor serial connection charge amplifying circuit, modulus conversion chip, single-chip microcomputer; Reset, starting circuit, signaling switch and crystal oscillating circuit are connected in series single-chip microcomputer respectively; Single-chip microcomputer and address memory, external data memory, output display device link.
Characteristics of the present utility model are to adopt singlechip technology, under software is supported, are recorded in the time dependent transient process of pressure of braking drive organ hydraulic system in the car brakeing process, can calculate the performance parameter of braking drive organ according to this.
Embodiment of the present utility model is as shown in drawings:
Fig. 1 is the design's cassette pressure transducer structural map, and wherein 1.1 is front views, and 1.2 is A-A cross section views of 1.1;
Fig. 2 is brake pump state when intact, the time dependent function relation figure of the pressure of hydraulic system;
Fig. 3 is the design's circuit structure block diagram;
Fig. 4 is the design's circuit connecting relation figure;
Number in the figure is represented:
Among Fig. 1:
1, bearing pin 2, clamp
3, cushion 4, piezoelectric crystal
5, oil pipe 6, bolt
7, adjusting nut
Among Fig. 2:
P, pressure t, time
Among Fig. 3,4:
(1), one-chip computer MCS-51
(2), pressure transducer
(3), charge amplifier
(4), modulus conversion chip A/D
(5), reset, starting circuit
(6), signaling switch
(7), address latch 74ls373
(8), external data memory 6264 RAM
(9), crystal oscillating circuit
(10), Tpup16A printer
In conjunction with the accompanying drawings the utility model is specified:
Referring to Fig. 1 is the structural representation of cassette pressure transducer, two clamp 2, one ends is arranged with bearing pins 1 hinge joint, and the other end has the screw of relative perforation, wherein wears bolt 6, and available adjusting nut 7 is fastening.Clamp 2 center section parts have the symmetrical grooves that just can coat oil pipe 5, and the groove inwall is lined with cushion 3, and embedding is crouched piezoelectric crystal 4 as the pressure transducer contact on it.During use clamp 2 is clipped on the oil pipe 5, the oil pressure that piezoelectric crystal 4 is contacted with oil pipe with its transmission of perception changes.Clamp generally is stuck in the nearly oil cylinder of oil pipe place and is advisable.
Under the intact situation of braking system state of the art, the time dependent funtcional relationship of the pressure of hydraulic system as shown in Figure 2 referring to Fig. 2,3,4.When time t=0, the driver steps on braking footrest, and signaling switch is connected, and instrument picks up counting.Through braking response time t
1After, pressure begins to rise, and through behind the brake coordination time t0, reaches maximal value.Behind the brake off, signaling switch disconnects, through braking releasing time t
3After, pressure gets back to zero.t
1, t
2, t
3With maximum pressure value P
MaxIt all is the important performance characteristic of braking drive organ.With these parameters and standard value contrast, just can determine the technology status and the fault of braking drive organ.
The circuit structure block diagram is as shown in Figure 3:
Electric quantity signal (a) records near the external clamping type sensor (2) on the pipeline of brake cylinder by being installed in the braking drive organ hydraulic system, change voltage signal and amplification into through charge amplifying circuit (3), under control signal (e, the c) control of single-chip microcomputer (1), open modulus conversion chip (4), with pressure on the number signal (b) input single-chip microcomputer (1).
Contact-making switch (d) is installed on the car brakeing pedal, when the engine neutral gear runs to the air drum of brake system or the pressure in the hydraulic energy storage device rises to setting, step on braking footrest and connect switch (d), single-chip microcomputer (1) is started working, start modulus conversion chip (4), adopt the pressure on the number signal into single-chip microcomputer and be stored in inside or external random access memory (8), every the regular hour, take a force value, up to the releasing of brake pedal, program curing is taked the pressure signal of some again.
After sampling finished, program curing calculated all force value according to the mechanics parameter of oil pipe 5 materials, made that the output result is consistent with input signal.
Operation circuit (g, m) between external data memory (8), address latch (7) and they and the single-chip microcomputer (1) stores effectively for single-chip microcomputer, transfer data information (h, k), address information (h, l) provide guarantee.
Under signal (i, j) control, information (f) after single-chip microcomputer (1) will be handled outputs to mini-printer (10), printer is determined the position of its corresponding point according to the corresponding relation of pressure and time, print pressure and time relation curve (shown in Figure 1), print maximum pressure value P according to result of calculation at last
MaxWith three characteristic time value t
1, t
2, t
3
Circuit connecting relation is as shown in Figure 4:
Electric quantity signal (a) is recorded by external clamping type piezoelectric sensor (2) and through the input of charge amplifier (3) end of oppisite phase, electric quantity signal is converted to voltage signal and amplifies back input modulus conversion chip (4) pin 13.
The contact-making switch d that is installed on the braking footrest is connected to initial sum termination time control circuit (6), inserts single-chip microcomputer (1) pin 12,13 then.
Single-chip microcomputer (1) pin 1-8 meets modulus conversion chip (4) pin 0-7, the pin 16,17 of single-chip microcomputer connects the pin 8,9 of modulus conversion chip (4) after anti-phase as the reading and writing control signal, single-chip microcomputer (1) pin (26) and address latch (7) pin 14 are received modulus conversion chip pin 10,12 respectively as gating signal simultaneously, and monolithic under-chassis 30 joins with co-ordination as clock signal and its pin 11.
Single-chip microcomputer 21-25 pin links to each other with data-carrier store (8) pin 20-16 and address latch (7) pin 8-15 links to each other as address selection with data memory (8) pin 0-7, monolithic under-chassis 32-39 link to each other with data memory (8) pin 8-15 carry out data transmission, the transport address signal that links to each other with address latch (7) pin 0-7, the transmission data link to each other with mini-printer (10) pin 0-7.
Monolithic under-chassis 26-28 and mini-printer (10) pin 8,9,10 joins to coordinate the work of printer and main frame.
Reset and starting circuit (5) access monolithic under-chassis 9.
Crystal oscillating circuit (9) inserts monolithic under-chassis 18,19.
Monolithic under-chassis 20,40 respectively ground connection and+the 5V power supply.
The leg of some other ground connection and power supply is in this not narration one by one.
The tester using method of the design embodiment is: near the external clamping type pressure transducer is installed on the pipeline of brake cylinder, trigger signal switch is installed on braking footrest in the braking drive organ hydraulic system.The engine of startup vehicle and the air drum (gas-liquid composite type) that neutral gear runs to brake system or the pressure in the hydraulic energy storage device (full hydraulic) rise to setting, then, step on braking footrest, the pressure of hydraulic system is started from scratch to rise and is also reached maximal value rapidly.The pressure of fluid makes oil pipe produce microdeformation, and its deflection and force value are directly proportional.The external clamping type pressure transducer is experienced the distortion of oil pipe and distortion is converted to the charge signal of piezoelectric crystal, changes voltage signal behind charge amplifier into.Magnitude of voltage is proportional to the pressure that the tubing deformation amount promptly is proportional to hydraulic system.Voltage signal is noted after amplification, filtering, A/D conversion.
Through the braking response time T
1After, pressure begins to rise and process brake coordination time T
2After, reach maximal value.Behind the brake off, signaling switch disconnects, and removes time T through braking
3Back pressure gets back to zero.t
1, t
2, t
3With maximum pressure value P
MaxIt all is the important performance characteristic of braking drive organ.These parameters and standard value are contrasted technology status and the fault that just can determine braking drive organ.The installation of external clamping type pressure transducer and signaling switch is all very convenient, and therefore, this instrument is applicable to on-the-spot online detection.
If the external clamping type pressure transducer is used the plug-in type pressure transducer instead, measuring accuracy will be higher.
Claims (5)
1, a kind of portable brake driving mechanism performance detector, comprise sensor, signals collecting, conversion, computing and input, output circuit and an output display device by a computer on-slice control is characterized in that the circuit signal trigger switch is installed on the braking footrest; Sensor is the pressure transducer that joins with hydraulic oil pipe.
2, detector as claimed in claim 1 is characterized in that the external clamping type pressure transducer that pressure transducer is made up of piezoelectric crystal and positioning fixture, and piezoelectric crystal and hydraulic pressure tube wall directly are abutted against.
3, detector as claimed in claim 2, it is characterized in that positioning fixture is the removable jew clip, comprise by a pair of clamp and forming, clamp one end connects with bearing pin, the other end has the screw of relative perforation, and the female screw of available butterfly connects, but the section opposite position has the symmetrical grooves of proper covering liquid pressuring oil pipe outer wall in two clamps, the groove inwall is lined with cushion, piezoelectric crystal have two positions relatively respectively embedding crouch on cushion.
4, detector as claimed in claim 1 is characterized in that pressure transducer is the plug-in type pressure transducer.
5, as the described detector of claim 1-4, it is characterized in that the testing circuit structure is: sensor serial connection charge amplifying circuit, modulus conversion chip, single-chip microcomputer; Reset, starting circuit, signaling switch and crystal oscillating circuit are connected in series single-chip microcomputer respectively; Single-chip microcomputer and address memory, external data memory, output display device link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93245198 CN2180989Y (en) | 1993-11-24 | 1993-11-24 | Portable brake driving mechanism proterty checking and testing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93245198 CN2180989Y (en) | 1993-11-24 | 1993-11-24 | Portable brake driving mechanism proterty checking and testing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2180989Y true CN2180989Y (en) | 1994-10-26 |
Family
ID=33818232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93245198 Expired - Fee Related CN2180989Y (en) | 1993-11-24 | 1993-11-24 | Portable brake driving mechanism proterty checking and testing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2180989Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591332A (en) * | 2014-10-24 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Anti-theft suspension support of cable |
| CN105591329A (en) * | 2014-10-23 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Pressure detection-type cable clamping hanging frame |
| CN105865699A (en) * | 2016-06-03 | 2016-08-17 | 北方工业大学 | Method and device for detecting unbalance of unmanned aerial vehicle brake system |
| CN106898058A (en) * | 2017-02-21 | 2017-06-27 | 成都雅骏新能源汽车科技股份有限公司 | A kind of data acquisition application apparatus of hydraulic braking system for automobile |
-
1993
- 1993-11-24 CN CN 93245198 patent/CN2180989Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591329A (en) * | 2014-10-23 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Pressure detection-type cable clamping hanging frame |
| CN105591332A (en) * | 2014-10-24 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Anti-theft suspension support of cable |
| CN105865699A (en) * | 2016-06-03 | 2016-08-17 | 北方工业大学 | Method and device for detecting unbalance of unmanned aerial vehicle brake system |
| CN106898058A (en) * | 2017-02-21 | 2017-06-27 | 成都雅骏新能源汽车科技股份有限公司 | A kind of data acquisition application apparatus of hydraulic braking system for automobile |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |