CN201697862U - A contact type friction interface stick-slip characteristic online detection device - Google Patents

Abstract

The utility model relates to the research field of the stick-slip characteristic of a friction interface, and discloses a contact-type on-line detection device for the stick-slip characteristic of a friction interface. It includes a test bench (1), a one-dimensional electric translation stage (8), a first three-dimensional manual translation stage (2), a second three-dimensional manual translation stage (7) arranged on the experiment bench (1), and the first three-dimensional manual translation stage (7). The three-dimensional manual translation platform (2) and the second three-dimensional manual translation platform (7) are respectively located on both sides of the one-dimensional electric translation platform (8); the one-dimensional electric translation platform (8) is fixed with a clamping friction matrix (10) The base fixture (9); the loading mechanism (4) that clamps the friction slider (11) is fixed on the first three-dimensional manual translation platform (2); the second three-dimensional manual translation platform (7) is fixed with The jig (6) is provided with a stylus type displacement sensor (5) for measuring the displacement of the friction slider (11).

Description

A contact type friction interface stick-slip characteristic online detection device

technical field

The utility model relates to the research field of the stick-slip characteristic of a friction interface, in particular to a contact type on-line detection device for the stick-slip characteristic of a friction interface.

Background technique

Precision positioning technology is widely used in aerospace, MEMS, metrology science, optics and optoelectronics engineering, precision engineering, bioengineering and other fields. In particular, as the requirements for positioning accuracy in industrial fields such as ultra-precision machining, ultra-precision measurement and robot systems continue to increase, the research on precision positioning technology becomes more important. During the positioning process, due to the stick-slip force on the friction surface of the positioning platform and the guide rail, the movement will show a discontinuous stick-slip motion, that is, the crawling phenomenon, and this phenomenon seriously affects the positioning accuracy in precision positioning. Therefore, the friction between the positioning table and the guide rail is the key to the accuracy of precision positioning equipment.

Utility model content

The purpose of the utility model is to provide an online detection device for the stick-slip characteristic of a contact friction interface, which can detect the stick-slip phenomenon and related characterization parameters of different contact surfaces due to the surface stick-slip characteristic in sliding friction.

In order to achieve the above object, the utility model adopts the following technical solutions to achieve.

An on-line detection device for stick-slip characteristics of a friction interface, characterized in that it includes a test bench, a one-dimensional electric displacement stage, a first three-dimensional manual displacement stage, a second three-dimensional manual displacement stage, and the first three-dimensional The manual displacement stage and the second three-dimensional manual displacement stage are respectively located on both sides of the one-dimensional electric displacement stage; the substrate fixture for clamping the friction matrix is fixed on the one-dimensional electric displacement stage; the clamp is fixed on the first three-dimensional manual displacement stage A loading mechanism holding the friction slider; a jig is fixed on the second three-dimensional manual displacement table, and a stylus displacement sensor for measuring the displacement of the friction slider is arranged on the jig.

The further improvement and characteristics of the utility model are: the loading mechanism includes a protective cover, one end of which is fixed in the friction measurement sensor in the protective cover, and the other end of the friction measurement sensor is fixed with a slider clamp for clamping the friction slider; The measurement sensor includes a middle connection block, a left connection block fixed with the protective cover, and a right connection block fixed with the slider fixture. The first metal sheet beam, the second The sheet metal beam corresponds to the first sheet metal beam, and the surface of the second sheet metal beam is attached with a first strain gauge and a second strain gauge, and among the two sheet metal beams, one is placed horizontally and the other is placed vertically.

In the utility model, the one-dimensional electric displacement stage is fixed with a substrate fixture for clamping the friction substrate, the first three-dimensional manual displacement stage is fixed with a loading mechanism for clamping the friction slider, and the second three-dimensional manual displacement stage is fixed with a fixture , the jig is provided with a stylus displacement sensor for measuring the displacement of the friction slider; the handwheel of the first three-dimensional manual translation stage can drive the friction slider clamping and loading mechanism to move downward to make the friction slider and the friction substrate contact, and the electric translation stage Drive the friction matrix and the friction slider to make sliding contact, and the stylus displacement sensor measures the displacement of the friction slider; in addition, a friction measurement sensor is set in the loading mechanism, one end of the friction measurement sensor is fixed on the protective cover, and the other end is fixed with a clamping friction slider. The slider fixture of the block can simultaneously test the friction coefficient of the friction slider and the friction matrix and the displacement change of the friction slider online, characterize the stick-slip motion phenomenon in detail, and lay the foundation for the study of the stick-slip characteristics of the friction interface.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

Fig. 1 is a schematic diagram of the overall structure of a friction interface stick-slip characteristic detection device of the present utility model; Fig. 2 is a schematic diagram of the structure of a one-dimensional electric displacement platform; Fig. 3 is a schematic diagram of the structure of a second three-dimensional manual displacement platform; Fig. 4 is a load friction Schematic diagram of the structure of the first three-dimensional manual translation platform of the slider; Figure 5 is a schematic diagram of the explosion of the loading mechanism; in the figure: 1, the experimental platform; 2, the first three-dimensional manual translation platform; 3, the bracket; 4, the loading mechanism; 401, Protective sleeve; 402, friction measurement sensor; 402-1, left connection block; 402-2, middle connection block; 402-3, right connection block; 402-4, first metal sheet beam; 402-5, second metal Sheet beam; 402-6, first strain gauge; 402-7, second strain gauge; 403, slider fixture; 5, stylus displacement sensor; 501, extension rod; 502, measuring needle; 6, fixture ; 7, the second three-dimensional manual translation stage; 8, one-dimensional electric translation stage; 9, substrate fixture; 10, friction substrate; 11, friction slider.

Detailed ways

With reference to Fig. 1, it is a kind of friction interface stick-slip characteristic on-line detection device of the present utility model, mainly comprises experimental platform 1, is arranged on the one-dimensional electric displacement platform 8 on the experimental platform 1, the first three-dimensional manual displacement platform 2, the second The three-dimensional manual translation platform 7 , the first three-dimensional manual translation platform 2 , and the second three-dimensional manual translation platform 7 are respectively located on the left and right sides of the one-dimensional electric translation platform 8 .

In conjunction with Fig. 2, the one-dimensional electric translation platform 8 is made up of base, the track that is arranged on the base, the translation platform that slides along the track, the stepper motor that is arranged on one end of the base, and the lead screw that connects stepper motor and translation platform Composition, the stepping motor can drive the displacement table to move forward and backward through the lead screw. A base clamp 9 is provided on the displacement stage for clamping the friction base 10 .

Referring to FIG. 3 , a jig 6 is fixed on the second three-dimensional manual displacement table 7 , and a stylus displacement sensor 5 is clamped on the jig 6 . There is a measuring needle 502 at the front end of the extending rod 501 of the stylus displacement sensor 5 , and the measuring needle 502 can shrink freely in the extending rod 501 . When in use, turn the hand wheel of the second three-dimensional manual displacement table 7 to make the measuring needle 502 contact with the friction slider 11 , and the displacement of the friction slider 11 is measured by the stylus displacement sensor 5 .

Referring to Figures 4 and 5, the first three-dimensional manual translation platform 2 fixes the loading mechanism 4 through the bracket 3 thereon. The loading mechanism 4 includes a protective sheath 401 , a friction measurement sensor 402 fixed at one end in the protective sheath 401 , and a slider clamp 403 that clamps the friction slider 11 is fixed at the other end of the friction measurement sensor 402 .

The friction measurement sensor (402) is mainly composed of the middle connecting block 402-2, the left connecting block 402-1 fixed with the protective cover 401, the right connecting block 402-3 fixed with the slider clamp 403, and the left connecting block 402-1, Between the middle connection block 402-2 and the right connection block 402-3, a first metal sheet beam 402-4 and a second metal sheet beam 402-5 are sequentially arranged, corresponding to the first metal sheet beam 402-4 and the second metal sheet beam 402-4. A first strain gauge 402-6 and a second strain gauge 402-7 are attached to the surface of the sheet beam 402-5. Among the two sheet metal beams, the first sheet metal beam 402-4 is a single sheet beam placed horizontally for measuring the normal pressure between the friction slider and the friction matrix, and the second sheet metal beam 402-5 is placed vertically Double sheet beam for measuring the friction force between the friction slider and the friction substrate. The positions of the two sheet metal beams between the left connecting block 402-1, the middle connecting block 402-2, and the right connecting block 402-3 can be interchanged.

The loading mechanism 4 clamping the friction slider 11 is fixed on the first three-dimensional manual displacement table 2. When the handle of the first three-dimensional manual displacement platform 2 is rotated to drive the loading mechanism 4 to move down so that the friction slider 11 and the friction base 10 are in contact, the friction The first strain gauge 402-6 on the first sheet metal beam 402-4 in the measurement sensor 402 measures and obtains the contact normal pressure. When the friction base 10 slides, due to friction and stick-slip, the friction slider 11 will have a stick-slip motion in the direction of motion of the friction base 10, and the second strain gauge on the second metal sheet beam 402-5 of the friction measurement sensor 4 402-7 measures and obtains the friction force, and the displacement signal of the friction slider 11 is measured and obtained by the stylus displacement sensor 5 .

The experimental process using the above-mentioned online detection device for the stick-slip characteristics of the friction interface is described as follows: (1) Preparatory work before the experiment: build the experimental platform, connect the one-dimensional electric displacement platform to the computer through the controller, and set the parameters of the stepping motor ( speed, distance). The friction measurement sensor and the stylus displacement sensor are connected to the computer through the signal acquisition board, and the sampling frequency is set.

(2) Experimental process: After sampling first, turn the hand wheel of the first three-dimensional manual translation stage, so that the loading mechanism moves down slowly until the friction slider contacts the friction substrate, and then continues to move down to between the friction slider and the friction substrate A certain load is loaded, and the magnitude of the load can be obtained by the first strain gauge on the friction measurement sensor and displayed on the computer through the signal acquisition board. Then, rotate the hand wheel of the second three-dimensional manual displacement stage to make the measuring needle of the stylus displacement sensor contact with the friction slider and shrink to a certain extent. At this time, start the one-dimensional moving electric translation stage to drive the base body and the slider to slide and contact.

Repeat the test: when the one-dimensional electric translation platform stops after a full stroke, turn the hand wheel of the second three-dimensional manual translation platform to separate the measuring needle of the stylus displacement sensor from the friction slider, and unload the friction slider and the friction substrate. Return the one-dimensional motorized stage to the initial position. Then, proceed to the experimental procedure (2) to repeat the measurement.

Claims (2)

1. a friction interface stick-slip characteristic on-line detection device, it is characterized in that, comprises experiment platform (1), is arranged on the one-dimensional electric displacement platform (8) on the experiment platform (1), the first three-dimensional manual displacement platform (2 ), the second three-dimensional manual translation platform (7), the first three-dimensional manual translation platform (2), and the second three-dimensional manual translation platform (7) are respectively located on both sides of the one-dimensional electric translation platform (8); The one-dimensional electric displacement stage (8) is fixed with the substrate fixture (9) of clamping friction substrate (10); The described first three-dimensional manual displacement stage (2) is fixed with the clamping friction slider (11) A loading mechanism (4); a jig (6) is fixed on the second three-dimensional manual displacement table (7), and a stylus displacement sensor (5) for measuring the displacement of the friction slider (11) is arranged on the jig (6) ). 2. The on-line detection device for stick-slip characteristics of friction interface according to claim 1, characterized in that, the loading mechanism (4) comprises a protective cover (401), and a friction measurement sensor ( 402), the other end of the friction measurement sensor (402) is fixed with a slider clamp (403) for clamping the friction slider (11); The friction measurement sensor (402) includes a middle connection block (402-2), a left connection block (402-1) fixed with the protective cover (401), a right connection block (402-1) fixed with the slider clamp (403) 3), between the left connection block (402-1), the middle connection block (402-2), and the right connection block (402-3), the first metal sheet beam (402-4), the second metal sheet beam (402-5), corresponding to the surface of the first sheet metal beam (402-4) and the second sheet metal beam (402-5), the first strain gauge (402-6) and the second strain gauge (402-7) are attached ), and one of the two sheet metal beams is placed horizontally and the other vertically.

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