CN107796605B - Brake friction performance detection device and friction coefficient calculation method - Google Patents
Brake friction performance detection device and friction coefficient calculation method Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention discloses a brake friction performance detection device and a friction coefficient calculation method, wherein the brake friction performance detection device comprises a pressure sensor, a displacement sensor, a temperature sensor and a single chip microcomputer; as defined by the friction coefficient, μ = F/N, where N is the brake pressure, N is the spring force provided by the brake spring, detected by the second pressure sensor, F is the braking force, and F is the braking force obtained by converting the overturning moment of the electrohydraulic drum brake base to the floor, i.e., F =
D, in the formula
Is the braking torque, which is measured by the first pressure sensor, D is the distance between the left and right bases of the electrohydraulic drum brake, D is the distance between the two points of action, so μ =
the/DN. The invention can detect the friction coefficient and temperature change of the brake by utilizing the conversion processing of the pressure sensor, the temperature sensor, the displacement sensor and the singlechip, and can detect the stroke of the push rod of the electric hydraulic drum brake and the back distance of the friction plate by the displacement sensor, thereby detecting the friction performance of the brake in real time.
Description
Technical Field
The invention relates to a brake friction performance detection device and a friction coefficient calculation method, and belongs to the technical field of brake friction.
Background
The electro-hydraulic drum brake has high braking efficiency, is widely applied to large-scale load-carrying equipment such as cranes, belt conveyors and the like, is an important part necessary for speed and position regulation and reliable stop, and has the basic working principle that two symmetrically arranged brake shoes radially hold a brake wheel to generate braking torque by utilizing the cooperation of a hydraulic system and a mechanical system: when the brake is opened, the electric hydraulic thruster generates thrust to compress the spring, and the brake shoe loosens the brake disc; when the brake is closed, the pusher is unloaded, and the brake shoe holds the brake disc tightly under the action of the braking spring force so as to generate braking.
For example, the utility model with the patent number Z L201220150282. X designs a test bed for detecting the performance of the electro-hydraulic brake, but the test cost of the test bed is high and the test bed cannot be carried out on the working condition site, and the patent with the application number 201420740657.7 provides a real-time monitoring device for the electro-hydraulic brake, but only designs a device for alarming when the brake fails, and does not describe a method for judging the failure of the brake.
From the current research situation in the related subject field, great research progress is made on structural design, installation parameter adjustment and inertia simulation brake tests of the electric hydraulic drum brake, but research on-site detection of friction performance working conditions of the electric hydraulic drum brake is not sufficient.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the device and the method for detecting the friction performance of the electric hydraulic drum brake, which can realize on-line detection and data storage of the friction coefficient, the braking temperature, the braking distance of a friction plate and the stroke of a push rod of the brake under the working condition and can realize more comprehensive detection of the friction performance of the brake.
In order to achieve the purpose, the invention adopts the technical scheme that: a friction performance detection device and a friction coefficient calculation method for an electro-hydraulic drum brake comprise the electro-hydraulic drum brake, a first pressure sensor, two first displacement sensors, a second pressure sensor and a temperature sensor, the hydraulic brake system comprises a second displacement sensor and a single chip microcomputer, wherein the first pressure sensor is arranged at the bottom of an electric hydraulic drum brake, the two first displacement sensors are respectively arranged on a left brake arm and a right brake arm of the electric hydraulic drum brake, the second pressure sensor is arranged at the top end of a telescopic spring shaft of the electric hydraulic drum brake, a temperature sensor is arranged on the surface of a friction plate of the electric hydraulic drum brake, the second displacement sensor is arranged at the top end of a push rod of the electric hydraulic drum brake, and the first pressure sensor, the two first displacement sensors, the second pressure sensor, the temperature sensor and the second displacement sensor are electrically connected with the single chip microcomputer.
Further, the temperature sensor is adhered to the surface of the friction plate of the electrohydraulic drum brake by a heat-resistant resin.
Furthermore, an induction probe of the second displacement sensor is mounted at the top end of the electric hydraulic drum brake and moves along with the push rod.
Furthermore, the singlechip is also provided with a display screen.
Further, the device also comprises a computer, and the singlechip is electrically connected with the computer.
Furthermore, two parallel steel plates are arranged at the tail end of a telescopic spring shaft of the electric hydraulic drum brake, and a second pressure sensor is arranged between the two steel plates.
Furthermore, the single chip microcomputer and the computer are integrated in a box body.
The friction coefficient calculation method is defined by the friction coefficient, wherein mu = F/N, N is braking pressure, N is spring force provided by a braking spring and detected by a second pressure sensor, F is braking force, and F is obtained by converting overturning moment of an electric hydraulic drum brake base to a floor, namely F =
D, in the formula
Measured by the first pressure sensor, D is the distance between the left and right bases of the electrohydraulic drum brake, and D is the distance between the two points of action, so μ = g
DN, the detection of the friction coefficient is converted into the measurement of the spring force and the pressure of the brake base to the floor.
The friction coefficient calculation method is defined by the friction coefficient, wherein mu = F/N, N is braking pressure, N is spring force provided by a braking spring and detected by a second pressure sensor, F is braking force, and F is obtained by converting overturning moment of an electric hydraulic drum brake base to a floor, namely F =
D, in the formula
Measured by the first pressure sensor, D is the distance between the left and right bases of the electrohydraulic drum brake, and D is the distance between the two points of action, so μ = g
DN, the detection of the friction coefficient is converted into the measurement of the spring force and the pressure of the brake base to the floor.
Compared with the prior art, the invention utilizes the pressure and temperature sensors, converts the received data through the singlechip, can detect the change of the friction coefficient and the temperature of the electric hydraulic drum brake, and can detect the numerical values of the stroke and the braking back distance of the push rod of the brake through the displacement sensor, thereby more comprehensively detecting the friction performance of the brake; the device simple structure easily installs and conveniently carries, can carry out real-time detection to the frictional property of stopper, can effectively prevent the emergence of accident.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a friction coefficient calculation method according to the present invention;
FIG. 3 is a schematic view of a second pressure sensor of the present invention mounted thereon;
in the figure: 101-electric hydraulic drum brake, 102-first pressure sensor, 103, 104-first displacement sensor, 105-second pressure sensor, 106-temperature sensor, 107-second displacement sensor, 201-single chip microcomputer, 202-display screen, 203-computer, 204-box.
Detailed Description
The invention will be further explained with reference to the drawings.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention includes an electro-hydraulic drum brake 101, a first pressure sensor 102, two first displacement sensors 103, 104, a second pressure sensor 105, a temperature sensor 106, a second displacement sensor 107 and a single chip 201;
the first pressure sensor 102 is arranged at the bottom of the electric hydraulic drum brake 101 and is used for measuring the magnitude of the overturning force; the two first displacement sensors 103 and 104 are respectively arranged on the left brake arm and the right brake arm of the electric hydraulic drum brake 101, and can measure the braking back distance of the left friction plate and the right friction plate;
the second pressure sensor 105 is arranged at the top end of a telescopic spring shaft of the electric hydraulic drum brake 101, and an induction probe of the second pressure sensor is fixedly arranged at the top end of the electric hydraulic drum brake 101 and moves along with a push rod, so that the pressure borne by the electric hydraulic drum brake 101 can be measured;
a temperature sensor 106 is arranged on the surface of a friction plate of the electric hydraulic drum brake 101, a second displacement sensor 107 is arranged at the top end of a push rod of the electric hydraulic drum brake 101, and the stroke of the push rod of the electric hydraulic drum brake is measured; the first pressure sensor 102, the two first displacement sensors 103 and 104, the second pressure sensor 105, the temperature sensor 106 and the second displacement sensor 107 are electrically connected with the singlechip 201.
In order to better obtain temperature data of the friction plate, the temperature sensor 106 is adhered to the friction plate surface of the electrohydraulic drum brake 101 by a heat-resistant resin; in order to compare the braking back distances of the left and right friction plates of the electric hydraulic drum brake 101, the mounting positions of the first displacement sensors 103 and 104 are ensured to be corresponding;
the single chip microcomputer 201 is further provided with a display screen 202, the single chip microcomputer 201 receives data for operation processing, and the brake friction coefficient and the temperature data obtained through calculation are transmitted to the display screen 202, so that a more visual online detection effect is achieved; the computer 203 is additionally arranged, the single chip microcomputer 201 is electrically connected with the computer 203 and is integrated into the box body 204, the carrying is convenient, data processed by the single chip microcomputer 201 can be transmitted into the computer 203 through a development board interface, the data is processed and stored again through upper computer software, and finally a chart is formed on a display interface.
As shown in fig. 3, two parallel steel plates are arranged at the tail end of the telescopic spring shaft of the electrohydraulic drum brake 101, the second pressure sensor 105 is arranged between the two steel plates, and in order to ensure that the stress at different points of the second pressure sensor 105 is more uniform, the corresponding surfaces of the two parallel steel plates are required to be in good parallel contact.
As shown in fig. 2, a friction coefficient calculation method is defined by a friction coefficient, where μ = F/N, where N is a brake pressure, N is a spring force provided by a brake spring, detected by the second pressure sensor 104, and F is a braking force, and the braking force F is obtained by converting an overturning moment of the base of the electrohydraulic drum brake 101 to the floor, that is, F =
D, in the formula
For the overturning force, it is measured by the first pressure sensor 102, D is the distance between the left and right bases of the electrohydraulic drum brake 101, D is the distance between the two points of action, D and D are found by inquiry or measurement in the specification of the electrohydraulic drum brake 101, therefore, μ = g =
DN, the detection of the friction coefficient is converted into the measurement of the spring force and the pressure of the brake base to the floor.
Taking the brake drum rotating counterclockwise as an example, it is only necessary to install the first pressure sensor 102 on the side with the electro-hydraulic pusher, and when installing the first pressure sensor 102, the connecting bolt on the side should be appropriately loosened, and then the first pressure sensor 102 should be inserted between the contact surfaces; because the two contact surfaces on the installation side of the first pressure sensor 102 are subjected to pressure, the proper loosening of the connecting bolt between the side of the electric hydraulic drum brake 101 and the rack does not have great influence on the braking performance, under the action of the self weight and the installation stress of the electric hydraulic drum brake 101, the initial measured value of the first pressure sensor 102 is not only the gravity of the brake, but also includes partial stress generated by installation deformation, and the initial value is subtracted in a debugging program to obtain the actual braking torque.
The display screen 202 displays the friction coefficient and the brake temperature in real time, and can display the friction coefficient and the brake temperature in real time through the indicating instrument, and a change curve of the data is drawn in a waveform chart.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (8)
1. The brake friction performance detection device is characterized by comprising an electric hydraulic drum brake (101), a first pressure sensor (102), two first displacement sensors (103, 104), a second pressure sensor (105), a temperature sensor (106), a second displacement sensor (107) and a single chip microcomputer (201),
the first pressure sensor (102) is arranged at the bottom of the electric hydraulic drum brake (101), the two first displacement sensors (103, 104) are respectively arranged on the left brake arm and the right brake arm of the electric hydraulic drum brake (101),
the second pressure sensor (105) is arranged at the top end of the telescopic spring shaft of the electro-hydraulic drum brake (101),
the temperature sensor (106) is arranged on the surface of a friction plate of the electric hydraulic drum brake (101), the second displacement sensor (107) is arranged at the top end of a push rod of the electric hydraulic drum brake (101), and the first pressure sensor (102), the two first displacement sensors (103, 104), the second pressure sensor (105), the temperature sensor (106), the second displacement sensor (107) and the single chip microcomputer (201) are electrically connected.
2. A brake friction performance detecting apparatus according to claim 1, wherein said temperature sensor (106) is adhered to a friction plate surface of the electric hydraulic drum brake (101) by a heat-resistant resin.
3. A brake friction performance detecting device according to claim 1, characterized in that the inductive probe of the second displacement sensor (107) is mounted on the top end of the electric hydraulic drum brake (101) and moves with the push rod.
4. The brake friction performance detection device according to claim 1, characterized in that the single chip microcomputer (201) is further provided with a display screen (202).
5. The brake friction performance detection device according to claim 1, characterized by further comprising a computer (203), wherein the single chip microcomputer (201) is electrically connected with the computer (203).
6. A brake friction performance detecting device according to claim 1, characterized in that two parallel steel plates are provided at the end of the telescopic spring shaft of the electrohydraulic drum brake (101), and the second pressure sensor (105) is provided between the two steel plates.
7. The device for detecting the friction performance of the brake as recited in claim 5, wherein the single chip microcomputer (201) and the computer (203) are integrated in a box body (204).
8. A friction coefficient calculating method of a brake friction performance detecting apparatus according to any of claims 1 to 7, characterized in that, as defined by a friction coefficient, μ = F/N, where N is a brake pressure, N is a spring force provided by a brake spring detected by the second pressure sensor (105), F is a braking force, F is obtained by converting an overturning moment of a base of the electrohydraulic drum brake (101) against a floor,
i.e. F =
D, in the formula
Is the overturning force, which is measured by a first pressure sensor (102), D is the distance between the left and right bases of the electrohydraulic drum brake (101), D is the distance between the two points of action, so mu =
/DN。
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| CN201710845679.8A CN107796605B (en) | 2017-09-19 | 2017-09-19 | Brake friction performance detection device and friction coefficient calculation method |
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| CN201710845679.8A CN107796605B (en) | 2017-09-19 | 2017-09-19 | Brake friction performance detection device and friction coefficient calculation method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108373089B (en) * | 2018-04-19 | 2024-03-12 | 石家庄五龙制动器股份有限公司 | Brake torque true value detection sensor and brake torque true value detection method for hub type brake |
| CN109269790B (en) * | 2018-10-30 | 2020-07-17 | 贵州云尚物联科技股份有限公司 | Vehicle brake pad safety monitoring system and method based on Internet of things |
| CN111398162B (en) * | 2020-03-27 | 2021-02-26 | 中国汽车工程研究院股份有限公司 | Method for testing friction coefficient of air pressure disc type brake assembly of commercial vehicle |
| CN112196747A (en) * | 2020-10-28 | 2021-01-08 | 江门市英合创展电子有限公司 | Monitoring and control system of wind power generation equipment brake and wind power generation equipment |
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