CN113358555B - Test device and test method for measuring friction coefficient of sealing ring under different compression ratios - Google Patents
Test device and test method for measuring friction coefficient of sealing ring under different compression ratios Download PDFInfo
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- CN113358555B CN113358555B CN202110544723.8A CN202110544723A CN113358555B CN 113358555 B CN113358555 B CN 113358555B CN 202110544723 A CN202110544723 A CN 202110544723A CN 113358555 B CN113358555 B CN 113358555B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- 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
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Abstract
The invention discloses a test device and a test method for measuring friction coefficients of a sealing ring under different compression ratios, and belongs to the technical field of plane undercarriage tests. The method is used for researching and measuring the friction coefficient of the sealing ring under the conditions of different compression ratios, and provides a test basis for calculating the friction force of the sealing ring. The device comprises a base, a guide rail, a loading plate, a load sensor, an upper clamping plate, a lower clamping plate, a compression amount adjusting screw, a positive pressure sensor, a sealing ring fixing plate and a friction plate; the test device also comprises a linear driving mechanism for driving the loading plate to do linear reciprocating motion along the guide rail; the bottom surface of the sealing ring fixing plate is provided with a containing groove for containing the sealing ring, and the friction plate is detachably connected to the base and located below the sealing ring fixing plate. The scheme fills up the technical blank, realizes the purpose of adjustable compression ratio in the friction coefficient test process, and has the advantages of good test effect, accurate test result and the like.
Description
Technical Field
The invention relates to a test device and a test method for measuring friction coefficients of a sealing ring under the conditions of different compression ratios, and belongs to the technical field of plane undercarriage tests.
Background
The hydraulic buffer buffers and decelerates the object acting on the hydraulic buffer to stop by means of hydraulic damping, and plays a certain protection role. Wherein, the friction coefficient of the sealing ring has an important influence on the calculation of the friction force of the sealing ring.
The measurement of the friction coefficients of the sealing rings with different compression ratios has no related published experimental research report at present at home, and the research starts earlier at this aspect at home, but the disclosure content is very little; and there is no relevant research in the presently disclosed patents. Therefore, how to measure the friction coefficient of the seal ring under the condition of different compression ratios becomes a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
Aiming at the problems, the invention provides a test device and a test method for measuring the friction coefficient of the sealing ring under the conditions of different compression ratios, which are used for researching and measuring the friction coefficient of the sealing ring under the conditions of different compression ratios and providing test basis for the calculation of the friction force of the sealing ring.
The technical scheme of the invention is as follows: the device comprises a base, a guide rail 9, a loading plate 4, a load sensor 5, an upper clamp plate 6, a lower clamp plate 12, a compression quantity adjusting screw 10, a positive pressure sensor 14, a sealing ring fixing plate 13 and a friction plate 7;
the guide rail 9 is fixedly connected to the base, the loading plate 4 and the upper clamp plate 6 are both slidably connected to the guide rail 9, the lower clamp plate 12 is fixedly connected to the bottom surface of the upper clamp plate 6, one end of the load sensor 5 is fixedly connected to the loading plate 4, and the other end of the load sensor is fixedly connected to the upper clamp plate 6 or the lower clamp plate 12; the testing device also comprises a linear driving mechanism for driving the loading plate 4 to do linear reciprocating motion along the guide rail 9;
the sealing ring fixing plate 13 is connected below the lower clamp plate 12 through a compression amount adjusting screw 10 and a positive pressure sensor 14, the upper part of the compression amount adjusting screw 10 is rotatably connected with the lower clamp plate 12, the bottom end of the compression amount adjusting screw 10 is in threaded connection with the positive pressure sensor 14, and the positive pressure sensor 14 is fixedly connected with the sealing ring fixing plate 13; the bottom surface of the sealing ring fixing plate 13 is provided with a containing groove for containing a sealing ring, and the friction plate 7 is detachably connected to the base and is positioned below the sealing ring fixing plate 13.
The width of the containing groove is larger than the outer diameter of the sealing ring 15.
And the bottom surface of the lower clamping plate 12 is also fixedly connected with a positioning pin 11 parallel to the compression adjusting screw 10, and the bottom end of the positioning pin 11 penetrates into the sealing ring fixing plate 13.
The upper portion of the outer wall of the compression amount adjusting screw 10 is provided with a limiting ring which is connected with the upper portion of the outer wall of the compression amount adjusting screw into a whole, a groove used for containing the limiting ring is formed in the top surface of the lower clamping plate 12, and the upper clamping plate 6 is sleeved with the compression amount adjusting screw 10 and presses the limiting ring.
The linear driving mechanism comprises a motor 1, a coupler 2, a screw rod 3 and a nut 8, the motor 1 is fixedly connected to one side of the base, the screw rod 3 is hinged above the base, one end of the screw rod 3 is in linkage with an output shaft of the motor 1 through the coupler 2, and the screw rod 3 is parallel to the guide rail 9;
the nut 8 is sleeved with the screw rod 3 and is in threaded connection with the screw rod 3; the nut 8 is also fixedly connected with the loading plate 4.
The number of the guide rails 9 is two, and the two guide rails 9 are symmetrically arranged along the center of the base and are parallel to each other.
The test was carried out as follows:
the method comprises the following steps: selecting a friction plate and a sealing ring according to test requirements, and shearing the annular sealing ring to form a long strip-shaped test piece for later use;
step two: starting a motor without placing a test piece, and collecting the reading of a load sensor in the movement process;
step three: installing a test piece, adjusting a compression amount adjusting screw, and reversely pushing out the current compression rate of the sealing ring at the corresponding position by measuring the distance between the sealing ring fixing plate and the friction plate;
step four: starting a motor, and collecting readings of a load sensor and a positive pressure sensor in the movement process;
step five: subtracting the thrust when the test piece is not placed from the thrust, and calculating a corresponding friction coefficient by a coulomb friction force calculation method;
step six: and (5) after one group of tests are finished, repeating the fourth step and the fifth step, repeating the tests, collecting data obtained by each test, and processing the data.
When the device is used, thrust or pull can be applied to the lower clamping plate and the sealing ring fixing plate (13) through the linear driving mechanism and the loading plate, so that the friction force can be measured conveniently; the distance between the sealing ring fixing plate and the friction plate can be changed by rotating the compression force adjusting screw, so that the compression ratio of the sealing ring is changed by pressing the sealing ring, and the test environment is provided. Finally, the purpose of measuring the friction coefficient of the sealing ring under the conditions of different compression ratios is achieved, the technical blank is filled, the purpose of adjusting the compression ratio is achieved in the friction coefficient test process, and the device has the advantages of being good in test effect, accurate in test result and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present application,
figure 2 is a schematic structural view of the sealing ring clamp in the present case,
FIG. 3 is a left side view of FIG. 2;
in the figure, 1 is a motor, 2 is a coupling, 3 is a screw rod, 4 is a loading plate, 5 is a load sensor, 6 is an upper clamp plate, 7 is a friction plate, 8 is a nut, 9 is a guide rail, 10 is a compression amount adjusting screw, 11 is a positioning pin, 12 is a lower clamp plate, 13 is a sealing ring fixing plate, 14 is a positive pressure sensor, and 15 is a sealing ring.
Detailed Description
In order to clearly explain the technical features of the present patent, the following detailed description is given in conjunction with the accompanying drawings.
The invention is shown in figures 1-3, and comprises a base, a guide rail 9, a loading plate 4, a load sensor 5, an upper clamping plate 6, a lower clamping plate 12, a compression adjusting screw 10, a positive pressure sensor 14, a sealing ring fixing plate 13 and a friction plate 7;
the guide rail 9 is fixedly connected to the base, the loading plate 4 and the upper clamp plate 6 are both slidably connected to the guide rail 9, the lower clamp plate 12 is fixedly connected to the bottom surface of the upper clamp plate 6, one end of the load sensor 5 is fixedly connected to the loading plate 4, and the other end of the load sensor is fixedly connected to the upper clamp plate 6 or the lower clamp plate 12; the testing device also comprises a linear driving mechanism for driving the loading plate 4 to do linear reciprocating motion along the guide rail 9;
the sealing ring fixing plate 13 is connected below the lower clamp plate 12 through a compression amount adjusting screw 10 and a positive pressure sensor 14, the upper part of the compression amount adjusting screw 10 is rotatably connected with the lower clamp plate 12, the bottom end of the compression amount adjusting screw 10 is in threaded connection with the positive pressure sensor 14, and the positive pressure sensor 14 is fixedly connected with the sealing ring fixing plate 13; the bottom surface of the sealing ring fixing plate 13 is provided with a containing groove for containing a sealing ring, and the friction plate 7 is detachably connected to the base and is positioned below the sealing ring fixing plate 13.
When the device is used, pushing force or pulling force can be applied to the lower clamping plate and the sealing ring fixing plate 13 through the linear driving mechanism and the loading plate, so that the friction force can be measured conveniently; the distance between the sealing ring fixing plate and the friction plate can be changed by rotating the compression force adjusting screw, so that the compression ratio of the sealing ring is changed by pressing the sealing ring, and the test environment is provided. Finally, the purpose of measuring the friction coefficient of the sealing ring under the condition of different compression ratios is achieved, the technical blank is filled, the purpose of adjusting the compression ratio in the friction coefficient test process is achieved, and the device has the advantages of being good in test effect, accurate in test result and the like.
The width of the containing groove is larger than the outer diameter of the sealing ring 15. Thereby can make better, the more free production deformation of sealing washer in compression process, avoid it to receive space constraint for the actual use operating mode is more pressed close to in the experiment, and then makes the test result more accurate.
The gap between the sealing ring 15 and the side wall of the accommodating groove only influences the test result in the initial stage of the test, and after the sealing ring fixing plate moves stably, accurate friction force can be obtained by means of the load sensor.
The bottom surface of the lower clamping plate 12 is also fixedly connected with a positioning pin 11 parallel to the compression adjusting screw 10, and the bottom end of the positioning pin 11 penetrates into the sealing ring fixing plate 13. Therefore, in the process of changing the compression amount of the sealing ring, namely in the process of rotating the compression amount adjusting screw 10, the sealing ring fixing plate 13 can move up and down in a more stable straight line, so that the stability of the measuring result is ensured.
The upper portion of the outer wall of the compression amount adjusting screw 10 is provided with a limiting ring which is connected with the upper portion of the outer wall of the compression amount adjusting screw into a whole, a groove used for containing the limiting ring is formed in the top surface of the lower clamping plate 12, and the upper clamping plate 6 is sleeved with the compression amount adjusting screw 10 and presses the limiting ring. A rotatable connection between the compression-amount adjusting screw 10 and the lower clamp plate 12 is thereby achieved, so that the compression-amount adjusting screw 10 can, and only can, be moved in a relative rotational movement with respect to the lower clamp plate 12.
The linear driving mechanism comprises a motor 1, a coupler 2, a screw rod 3 and a nut 8, the motor 1 is fixedly connected to one side of the base, the screw rod 3 is hinged above the base, one end of the screw rod 3 is in linkage with an output shaft of the motor 1 through the coupler 2, and the screw rod 3 is parallel to the guide rail 9;
the nut 8 is sleeved with the screw rod 3 and is in threaded connection with the screw rod 3; the nut 8 is also fixedly connected with the loading plate 4. Therefore, after the motor is started, the output shaft of the motor rotates to drive the screw rod to rotate through the coupler, so that the nut and the loading plate are driven to stably perform linear reciprocating motion, and the purpose of applying thrust or pulling force to the lower clamping plate through the loading plate is finally achieved.
The number of the guide rails 9 is two, and the two guide rails 9 are symmetrically arranged along the center of the base and are parallel to each other. So that a more stable guiding action of the loading plate 4 and the upper clamping plate 6 can be achieved.
The test was carried out as follows:
the method comprises the following steps: selecting a friction plate and a sealing ring according to test requirements, and shearing the annular sealing ring to form a long strip-shaped test piece for later use;
step two: starting a motor without placing a test piece, and collecting the reading of a load sensor in the movement process by a computer;
step three: installing a test piece, placing the test piece in the accommodating groove in parallel to the length direction of the accommodating groove, adjusting a compression amount adjusting screw, and reversely pushing out the current compression rate of the sealing ring at the corresponding position by measuring the distance between the sealing ring fixing plate and the friction plate;
step four: starting a motor, and acquiring readings of a load sensor and a positive pressure sensor by a computer in a movement process so as to obtain the positive pressure and the thrust of a sealing ring in the movement process;
step five: subtracting the thrust when the test piece is not placed from the thrust, and calculating a corresponding friction coefficient by a coulomb friction force calculation method;
step six: and (4) after one group of tests are finished, repeating the fourth step and the fifth step, repeating the tests, collecting data obtained by each test, and performing data processing (usually performing 3-8 groups of tests), namely averaging the friction coefficients obtained by multiple tests.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. A test method for measuring friction coefficients of sealing rings under different compression ratios is characterized by being realized by a test device, wherein the test device comprises a base, a guide rail (9), a loading plate (4), a load sensor (5), an upper clamping plate (6), a lower clamping plate (12), a compression amount adjusting screw (10), a positive pressure sensor (14), a sealing ring fixing plate (13) and a friction plate (7);
the guide rail (9) is fixedly connected to the base, the loading plate (4) and the upper clamping plate (6) are slidably connected to the guide rail (9), the lower clamping plate (12) is fixedly connected to the bottom surface of the upper clamping plate (6), one end of the load sensor (5) is fixedly connected to the loading plate (4), and the other end of the load sensor is fixedly connected to the upper clamping plate (6) or the lower clamping plate (12); the testing device also comprises a linear driving mechanism for driving the loading plate (4) to do linear reciprocating motion along the guide rail (9);
the sealing ring fixing plate (13) is connected below the lower clamping plate (12) through a compression adjusting screw (10) and a positive pressure sensor (14), the upper part of the compression adjusting screw (10) is rotatably connected with the lower clamping plate (12), the bottom end of the compression adjusting screw (10) is in threaded connection with the positive pressure sensor (14), and the positive pressure sensor (14) is fixedly connected with the sealing ring fixing plate (13); the bottom surface of the sealing ring fixing plate (13) is provided with a containing groove for containing a sealing ring, and the friction plate (7) is detachably connected to the base and is positioned below the sealing ring fixing plate (13);
the test was carried out as follows:
the method comprises the following steps: selecting a friction plate and a sealing ring according to test requirements, and shearing the annular sealing ring to form a long strip-shaped test piece for later use;
step two: starting a motor without placing a test piece, and collecting the reading of a load sensor in the movement process;
step three: installing a test piece, adjusting a compression amount adjusting screw, and reversely pushing out the current compression rate of the sealing ring at the corresponding position by measuring the distance between the sealing ring fixing plate and the friction plate;
step four: starting a motor, and collecting readings of a load sensor and a positive pressure sensor in the movement process;
step five: subtracting the thrust when the test piece is not placed from the thrust, and calculating a corresponding friction coefficient by a coulomb friction force calculation method;
step six: and (5) after one group of tests are finished, repeating the fourth step and the fifth step, repeating the tests, collecting data obtained by each test, and processing the data.
2. The test method for measuring the friction coefficient of the sealing ring under the condition of different compression ratios as claimed in claim 1, wherein the width of the accommodating groove is larger than the outer diameter of the sealing ring (15).
3. The test method for measuring the friction coefficient of the sealing ring under the condition of different compression ratios according to claim 1, characterized in that a positioning pin (11) parallel to a compression amount adjusting screw (10) is fixedly connected to the bottom surface of the lower clamping plate (12), and the bottom end of the positioning pin (11) penetrates into the sealing ring fixing plate (13).
4. The test method for measuring the friction coefficient of the sealing ring under the condition of different compression ratios according to claim 1, wherein a limiting ring connected with the compression amount adjusting screw (10) is arranged at the upper part of the outer wall of the compression amount adjusting screw, a groove for accommodating the limiting ring is formed in the top surface of the lower clamping plate (12), and the upper clamping plate (6) is sleeved with the compression amount adjusting screw (10) and presses on the limiting ring.
5. The test method for measuring the friction coefficient of the sealing ring under the condition of different compression ratios according to claim 1, characterized in that the linear driving mechanism comprises a motor (1), a coupler (2), a screw rod (3) and a nut (8), the motor (1) is fixedly connected to one side of a base, the screw rod (3) is hinged above the base, one end of the screw rod (3) is in linkage with an output shaft of the motor (1) through the coupler (2), and the screw rod (3) is parallel to the guide rail (9);
the nut (8) is sleeved with the screw rod (3) and is in threaded connection with the screw rod (3); the nut (8) is also fixedly connected with the loading plate (4).
6. A test method for measuring the friction coefficient of a seal ring under the condition of different compression ratios according to claim 1, characterized in that the number of the guide rails (9) is two, and the two guide rails (9) are symmetrically arranged along the center of the base and are parallel to each other.
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| CN202110544723.8A CN113358555B (en) | 2021-05-19 | 2021-05-19 | Test device and test method for measuring friction coefficient of sealing ring under different compression ratios |
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| CN202110544723.8A CN113358555B (en) | 2021-05-19 | 2021-05-19 | Test device and test method for measuring friction coefficient of sealing ring under different compression ratios |
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| CN113358555B true CN113358555B (en) | 2023-02-10 |
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| CN113358555A (en) | 2021-09-07 |
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