CN109142213B - Rocket sled slide rail sliding friction coefficient measuring device - Google Patents
Rocket sled slide rail sliding friction coefficient measuring device Download PDFInfo
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- CN109142213B CN109142213B CN201811301627.5A CN201811301627A CN109142213B CN 109142213 B CN109142213 B CN 109142213B CN 201811301627 A CN201811301627 A CN 201811301627A CN 109142213 B CN109142213 B CN 109142213B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention discloses a rocket sled sliding rail sliding friction coefficient measuring device which comprises a traction tackle, a balance weight tackle, a sliding rail and a vehicle-mounted data acquisition and processing system, wherein the balance weight tackle and the traction tackle are sequentially arranged on the sliding rail, the front end of the balance weight tackle is connected with the rear end of the traction tackle, the bottom of the balance weight tackle is provided with a test sliding plate, a vertical force sensor is arranged between the upper end surfaces of the balance weight tackle and the test sliding plate, a course force sensor is arranged between the rear end surfaces of the balance weight tackle and the test sliding plate, a ground magnet is arranged on the ground on one side of the sliding rail, Hall type speed sensors are equidistantly distributed on one side of the balance weight tackle along the length direction, the vehicle-mounted data acquisition and processing system is arranged on the balance weight tackle, and the vehicle-mounted data acquisition and processing system is respectively. The method and the device have the advantages of simple structure, convenience in operation, high measurement precision and relatively low cost.
Description
Technical Field
The invention relates to the technical field of aviation equipment measurement, in particular to a device for measuring sliding friction coefficient of a rocket sled sliding rail.
Background
At present, the domestic friction coefficient measuring technology is applied to railways, airport runways and highways, but all the domestic friction coefficient measuring technology belongs to rolling friction coefficient measurement, and sliding friction coefficient measuring equipment with engineering application capacity is almost blank, wherein the rocket sled sliding rail sliding friction coefficient measuring equipment is firstly developed at home.
Classical friction theory formula mu ═ fMassage deviceThe coefficient of friction is related to friction pair material and contact surface pressure, and the coefficient of friction is related to relative sliding speed, lubricating condition, surface temperature and other factors. Friction coefficient measuring equipment for accurately identifying influence parameters and calculating friction coefficient in engineering practiceThe key to the development.
The sliding friction coefficient of the rocket sled sliding rail is particularly important for calculating the rocket sled trajectory. In multiple important rocket sled tests in China, the working starting point of a test piece must be selected in the deceleration section of the rocket sled test, and because the deceleration of the deceleration section of the rocket sled is greatly influenced by the change of the friction coefficient of the sliding rail, the actual sliding distance of the deceleration section of the rocket sled is different from the estimated value of the trajectory by more than hundreds of meters, the conditions of speed index overrun and test invalidity of the starting point of the test piece are caused.
For the rocket sled sliding rail, the friction coefficient between the rocket sled sliding block and the sliding rail is also related to factors such as friction pair materials, sliding speed, surface pressure, surface temperature and the like. How to truly simulate the contact environmental parameters of the rocket sled sliding block and the sliding rail and quickly and accurately obtain the sliding friction coefficient is one of the difficulties of the device, but the technology is still blank at home at present.
The device for measuring the sliding friction coefficient of the rocket sled sliding rail can test the change rule of the friction coefficient along with factors such as speed, pressure, lubrication, temperature and the like, has the test capability of heavy load and high speed tests, and the PV value (the product of pressure and speed) of the device can reach more than 60 MPa.m/s. The device can meet the sliding friction coefficient testing capability under different friction pairs, different lubrication conditions and different temperature conditions, and has the advantages of high sampling rate, high processing speed, high precision and the like.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the device for measuring the sliding friction coefficient of the slide rail of the rocket sled, which is used for rapidly and accurately measuring the sliding friction coefficient between the slide block of the rocket sled and the slide rail.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a rocket sled slide rail sliding friction coefficient measuring device comprises a traction tackle, a balance weight tackle, a slide rail and a vehicle-mounted data acquisition and processing system, wherein the balance weight tackle and the traction tackle are sequentially arranged on the slide rail, the front end of the balance weight tackle is connected with the rear end of the traction tackle, a test slide plate is arranged at the bottom of the balance weight tackle, the balance weight tackle is in contact with the slide rail through the test slide plate, a vertical force sensor is arranged between the upper end faces of the balance weight tackle and the test slide plate, a course force sensor is arranged between the rear end faces of the balance weight tackle and the test slide plate, a ground magnet is arranged on the ground on one side of the slide rail, Hall speed sensors are equidistantly distributed on one side of the balance weight tackle along the length direction, when the balance weight tackle passes through the ground magnet, the Hall speed sensors pass through the upper portion of the ground magnet, the vehicle-mounted data, The course force sensor is connected with the Hall type speed sensor.
According to the technical scheme, the bottom of the counterweight pulley is provided with two limiting slide blocks, and the two limiting slide blocks are distributed on the front side and the rear side of the test sliding plate.
According to the technical scheme, the limiting sliding block is connected with the counterweight pulley through the hinged bolt.
According to the technical scheme, the bottom of the traction tackle is provided with the limiting slide block, and the limiting slide block is connected with the traction tackle through the hinged bolt.
According to the technical scheme, the bottom of the counterweight pulley is provided with the pair of guard plates, and the pair of guard plates are arranged on two sides of the sliding rail.
According to the technical scheme, the inner side of the guard plate is provided with the roller, and the guard plate is in contact with the sliding rail through the roller.
According to the technical scheme, the counterweight pulley is provided with a groove, the vehicle-mounted data acquisition and processing system is arranged in the groove, and the upper end of the groove is provided with the heat-insulation vibration-reduction plate.
The invention has the following beneficial effects:
the method comprises the following steps that a test sliding plate is used for simulating the contact environment parameters of a rocket sled sliding block and a sliding rail, the environment parameters are factors such as friction pair materials, sliding speed, surface pressure and surface temperature, and a vehicle-mounted data acquisition and processing system is used for detecting the inertia force and the friction force of the sliding plate through a course force sensor; when the counterweight pulley passes through a ground magnet arranged on the ground, the counterweight pulley senses the change of a magnetic field to generate a voltage signal to complete speed testing, and the sliding friction coefficient between the rocket sled sliding block and the sliding rail is quickly and accurately obtained through data processing and analysis. The test of the friction coefficient of the slide rail of the rocket sled can be met within the speed of 300m/s at most, and the application range is wide.
Drawings
FIG. 1 is a front view of a device for measuring sliding friction coefficient of a rocket sled rail according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
in the figure, 1-a limiting slide block, 2-a counterweight tackle, 3-a course force sensor, 4-a vertical force sensor, 5-a heat-insulation damping plate, 6-a vehicle-mounted data acquisition and processing system, 7-a test sliding plate, 8-a hinge bolt, 9-a traction tackle, 10-a Hall type speed sensor, 11-a ground magnet and 12-a slide rail.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 2, a rocket sled sliding rail sliding friction coefficient measuring device in one embodiment of the invention includes a traction tackle 9, a counterweight tackle 2, a sliding rail 12 and a vehicle-mounted data acquisition and processing system 6, the counterweight tackle 2 and the traction tackle 9 are sequentially arranged on the sliding rail 12, the front end of the counterweight tackle 2 is connected with the rear end of the traction tackle 9, the bottom of the counterweight tackle 2 is provided with a test sliding plate 7, the counterweight tackle 2 is in contact with the sliding rail 12 through the test sliding plate 7, a vertical force sensor 4 is arranged between the counterweight tackle 2 and the upper end face of the test sliding plate 7, a course force sensor 3 is arranged between the counterweight tackle 2 and the rear end face of the test sliding plate 7, a ground magnet 11 is arranged on the ground at one side of the sliding rail 12, hall type speed sensors 10 are equidistantly distributed along the length direction at one side of the counterweight tackle 2, when the counterweight tackle, the Hall type speed sensor 10 passes right above the ground magnet 11, the Hall type speed sensor 10 is arranged opposite to the ground magnet 11, the vehicle-mounted data acquisition and processing system 6 is arranged on the counterweight pulley 2, and the vehicle-mounted data acquisition and processing system 6 is respectively connected with the vertical force sensor 4, the course force sensor 3 and the Hall type speed sensor 10; simulating contact environment parameters of a rocket sled sliding block and a sliding rail 12 through a test sliding plate 7, wherein the environment parameters are friction pair materials, sliding speed, surface pressure, surface temperature and other factors, and a vehicle-mounted data acquisition and processing system 6 detects inertia force and friction force of the sliding plate 7 through a course force sensor 3; when the counterweight pulley 2 passes through a ground magnet 11 installed on the ground, the Hall type speed sensor 10 senses the change of the magnetic field to generate a voltage signal, and transmits the voltage signal to the vehicle-mounted data acquisition and processing system 6 to finish the speed test, and the vehicle-mounted data acquisition and processing system 6 integrates the data and then obtains the sliding friction coefficient between the test sliding plate 7 and the sliding rail 12 through data processing and analysis.
Further, the slide rail 12 is laid on the ground.
Further, 2 bottoms of counter weight coaster are equipped with two limiting slide blocks 1, and two limiting slide blocks 1 distribute in both sides around test slide 7.
Further, the limiting slide block 1 is connected with the counterweight pulley 2 through a hinged bolt 8.
Furthermore, the bottom of the traction tackle 9 is provided with a limiting slide block 1, and the limiting slide block 1 is connected with the traction tackle 9 through a hinged bolt 8.
Further, a pair of guard plates is arranged at the bottom of the counterweight pulley 2 and arranged at two sides of the slide rail 12.
Further, the inner side of the guard plate is provided with a roller, and the guard plate is contacted with the slide rail 12 through the roller.
Furthermore, a groove is formed in the counterweight pulley 2, the vehicle-mounted data acquisition and processing system 6 is arranged in the groove, and a heat-insulation vibration-reduction plate 5 is arranged at the upper end of the groove.
The working principle of the invention is as follows:
different positive pressure working conditions are simulated by loading the balancing weights with different masses, the positive pressure of the contact surface is tested by the high sampling rate sensor, and in order to eliminate additional friction force formed in the loading process, a ball mechanism is designed in a loading area to eliminate measurement errors; measuring the friction force of the test surface in real time by a course pressure sensor; the relative movement speed is measured in real time by an electromagnetic induction sensor carried by measuring equipment; surface lubrication is solved by coating a lubricant on the contact surface; and the real-time measurement data is transmitted to a special data acquisition and processing system of the measurement equipment by a uniform time origin to carry out later-stage friction coefficient analysis.
According to earlier research results, for the rocket sled sliding rail 12, the friction coefficient is actually mainly related to the product of the pressure and the speed of the sliding block and the lubrication condition between the friction pairs, and the calculation formula of the rocket sled sliding rail friction coefficient is as follows:
a) the coefficient of sliding friction under dry friction conditions was calculated as:
b) the theoretical model for calculating the dynamic friction coefficient under the lubricating condition is as follows:
therefore, the rocket sled sliding rail sliding friction coefficient measuring equipment mainly tests the pressure intensity and the relative sliding speed between the friction pairs (namely the sliding plate and the rail) to obtain the friction coefficient variation trend under different load and speed working conditions.
The device for measuring the sliding friction coefficient of the rocket sled sliding rail is connected with a rocket sled (or an automobile) through a traction tackle 9 and slides along the rocket sled sliding rail at a high speed under the traction of the rocket sled (or the automobile). The counterweight tackle 2 and the traction tackle 9 are connected with the limiting sliding blocks 1 through the hinge bolts 8 and are installed on the sliding rails, the structural weight of the counterweight tackle 2 is borne by the two limiting sliding blocks 1 and the test sliding plate 7 together, a vertical force is applied to the test sliding plate 7, and the magnitude of the vertical force is measured by the vertical force sensor 4; the test sliding plate 7 is arranged at the lower part of the counterweight pulley 2, the rear end surface of the test sliding plate is contacted with the course force sensor 3 arranged on the counterweight pulley 2, and the load measured by the course force sensor 3 comprises the inertia force and the friction force of the test sliding plate 7; a plurality of Hall type speed sensors 10 are equidistantly installed on the side surface of the body of the counterweight tackle 2, and when the counterweight tackle 2 passes through a ground magnet 11 installed on the ground, the Hall type speed sensors 10 sense the change of a magnetic field to generate voltage signals to finish speed testing; the test data of the course force sensor 3, the vertical force sensor 4 and the Hall type speed sensor 10 are simultaneously transmitted to the vehicle-mounted data acquisition and processing system 6, and the sliding friction coefficient between the test sliding plate 7 and the sliding rail can be obtained through data processing and analysis.
The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.
Claims (7)
1. A rocket sled sliding rail sliding friction coefficient measuring device is characterized by comprising a traction tackle, a balance weight tackle, a sliding rail and a vehicle-mounted data acquisition and processing system, wherein the balance weight tackle and the traction tackle are sequentially arranged on the sliding rail, the front end of the balance weight tackle is connected with the rear end of the traction tackle, the bottom of the balance weight tackle is provided with a test sliding plate, the balance weight tackle is contacted with the sliding rail through the test sliding plate, a vertical force sensor is arranged between the upper end surfaces of the balance weight tackle and the test sliding plate, a course force sensor is arranged between the rear end surfaces of the balance weight tackle and the test sliding plate, a ground magnet is arranged on the ground on one side of the sliding rail, Hall type speed sensors are equidistantly distributed on one side of the balance weight tackle along the length direction, when the balance weight tackle passes through the ground magnet, the Hall type speed sensors correspond to the, the vehicle-mounted data acquisition and processing system is respectively connected with the vertical force sensor, the course force sensor and the Hall type speed sensor.
2. The rocket sled sliding rail sliding friction coefficient measuring device according to claim 1, wherein two limiting sliding blocks are arranged at the bottom of the counterweight pulley, and the two limiting sliding blocks are distributed at the front side and the rear side of the test sliding plate.
3. The rocket sled sliding track sliding friction coefficient measuring device according to claim 2, wherein the limiting slide block is connected with the counterweight sled through a hinge bolt.
4. The rocket sled sliding rail sliding friction coefficient measuring device according to claim 1, wherein the bottom of the traction tackle is provided with a limiting slide block, and the limiting slide block is connected with the traction tackle through a hinge bolt.
5. The rocket sled sliding track sliding friction coefficient measuring device according to claim 1, wherein a pair of guard plates are arranged at the bottom of the counterweight pulley, and a pair of guard plates are arranged at two sides of the sliding track.
6. A rocket sled rail sliding friction coefficient measuring device according to claim 5 wherein the inside of the guard plate is provided with rollers, and the guard plate is in contact with the rail through the rollers.
7. The rocket sled sliding rail sliding friction coefficient measuring device according to claim 1, wherein the counterweight sled is provided with a groove, the vehicle-mounted data acquisition and processing system is arranged in the groove, and the upper end of the groove is provided with a heat insulation and vibration reduction plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811301627.5A CN109142213B (en) | 2018-11-02 | 2018-11-02 | Rocket sled slide rail sliding friction coefficient measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811301627.5A CN109142213B (en) | 2018-11-02 | 2018-11-02 | Rocket sled slide rail sliding friction coefficient measuring device |
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| CN109142213A CN109142213A (en) | 2019-01-04 |
| CN109142213B true CN109142213B (en) | 2021-03-23 |
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| CN201811301627.5A Active CN109142213B (en) | 2018-11-02 | 2018-11-02 | Rocket sled slide rail sliding friction coefficient measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112683775B (en) * | 2020-11-18 | 2022-10-25 | 中交公路规划设计院有限公司 | Steel shell concrete immersed tube tunnel push-out type final joint sliding track friction force testing system |
| CN112504600B (en) * | 2020-11-30 | 2022-09-27 | 中国工程物理研究院总体工程研究所 | Guide sliding shoe of rocket sled |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2168164C2 (en) * | 1998-12-22 | 2001-05-27 | Пиранишвили Георгий Константинович | Friction coefficient meter |
| JP2004037148A (en) * | 2002-07-01 | 2004-02-05 | Mitsubishi Alum Co Ltd | Sliding testing method |
| CN101339112A (en) * | 2008-08-19 | 2009-01-07 | 东南大学 | Machine tool guiding rail friction wear testing machine |
| CN103217267A (en) * | 2013-03-27 | 2013-07-24 | 南京理工大学 | Device and method for testing dynamic characteristics parameters of joint part of rolling-sliding combined guide rail |
| CN204586524U (en) * | 2015-03-03 | 2015-08-26 | 陕西理工学院 | Based on the automatic speed limit device of car of Hall element |
| CN107255618A (en) * | 2017-07-17 | 2017-10-17 | 北京强度环境研究所 | A kind of Large Launch Vehicle binding mechanism top load lubrication friction pilot system |
| CN207336263U (en) * | 2017-05-27 | 2018-05-08 | 南京工程学院 | Rolling guide joint dynamic Contact stiffness test platform |
| CN208060057U (en) * | 2018-01-08 | 2018-11-06 | 中广核核电运营有限公司 | Sliding block slide plate friction experiment device |
-
2018
- 2018-11-02 CN CN201811301627.5A patent/CN109142213B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2168164C2 (en) * | 1998-12-22 | 2001-05-27 | Пиранишвили Георгий Константинович | Friction coefficient meter |
| JP2004037148A (en) * | 2002-07-01 | 2004-02-05 | Mitsubishi Alum Co Ltd | Sliding testing method |
| CN101339112A (en) * | 2008-08-19 | 2009-01-07 | 东南大学 | Machine tool guiding rail friction wear testing machine |
| CN103217267A (en) * | 2013-03-27 | 2013-07-24 | 南京理工大学 | Device and method for testing dynamic characteristics parameters of joint part of rolling-sliding combined guide rail |
| CN204586524U (en) * | 2015-03-03 | 2015-08-26 | 陕西理工学院 | Based on the automatic speed limit device of car of Hall element |
| CN207336263U (en) * | 2017-05-27 | 2018-05-08 | 南京工程学院 | Rolling guide joint dynamic Contact stiffness test platform |
| CN107255618A (en) * | 2017-07-17 | 2017-10-17 | 北京强度环境研究所 | A kind of Large Launch Vehicle binding mechanism top load lubrication friction pilot system |
| CN208060057U (en) * | 2018-01-08 | 2018-11-06 | 中广核核电运营有限公司 | Sliding block slide plate friction experiment device |
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| CN109142213A (en) | 2019-01-04 |
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