CN109186856B - Calibration method and measurement method for pressure value of starting friction torque measuring instrument - Google Patents
Calibration method and measurement method for pressure value of starting friction torque measuring instrument Download PDFInfo
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- CN109186856B CN109186856B CN201811278371.0A CN201811278371A CN109186856B CN 109186856 B CN109186856 B CN 109186856B CN 201811278371 A CN201811278371 A CN 201811278371A CN 109186856 B CN109186856 B CN 109186856B
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
The invention discloses a calibration method and a measurement method for a pressure value of a starting friction torque measuring instrument, belongs to the technical field of bearing detection, and aims to solve the problems that the existing starting friction torque measuring instrument is low in measuring efficiency, complicated in calculation process and inaccurate in pressure scale value after a glass container is damaged. Starting a measuring method of a friction torque measuring instrument pressure value, placing a measuring load device on a measured bearing, aligning scales on a rotary column to a base to fix a pointer, and placing an air pressure nozzle opposite to a pressure receiver; the pressure receiver rotates relative to the base by a value which is more than or equal to a scale value on a half base, the friction torque is qualified, otherwise, the friction torque is unqualified; ten marker points friction moments were measured. The calibration method comprises the following steps: and vertically downwards placing the air pressure nozzle at a position 20mm away from the precision electronic balance, opening the three-way valve to increase the air source pressure from 0.1g, obtaining an actual pressure value through the precision electronic balance, and calibrating the pressure scale value position of the glass container. The invention is used for detecting the bearing of the aeronautical instrument.
Description
Technical Field
The invention relates to a calibration method and a measurement method for a pressure value of a starting friction torque measuring instrument, and belongs to the technical field of bearing detection.
Background
The aviation instrument bearing has high requirement on the flexibility of bearing rotation, the starting friction torque technical index is used in the standard to determine whether the flexibility of bearing rotation meets the use requirement, and in order to quickly and accurately measure the starting friction torque, a calibration method and a quick measurement method of a glass container air pressure indicator on the instrument are provided.
The measuring instrument is driven by compressed air, the reading value of the moment is calculated according to the value displayed on the barometer, and the moment value is in g.cm. The measuring instrument comprises a movable ring with a nozzle, a base column, a glass container air pressure indicator, a measuring load device (consisting of a heavy hammer, a scale beam and a pressure receiver), a rotating column, a sleeve, measuring mark points (10 equally divided different positions), two air path valves and three support columns for adjusting the level, as shown in figures 1, 2, 3 and 4.
The measuring method comprises the following steps:
firstly, cleaning the bearing, then measuring friction torque, firstly aligning the 1 st scale on the rotary column with a fixed pointer of a base, rotating a movable ring of the base, and placing a nozzle at the opposite position of a pressure receiver of a load measuring device, so that the distance between the nozzle and the receiver is kept about 20mm (see figure two), but the center of the nozzle and the center of the pressure receiver are required to be in a straight line.
And step two, slowly opening the three-way valve to enable the pressure to be stably increased, recording the pressure value of the pressure indicator (see figure three) when the pressure receiver rotates to exceed a half scale, and calculating the starting friction torque value according to a formula Mtp (F multiplied by L) (g.cm).
Variable Mtp in the formula is starting friction torque; f-air pressure (g); the length of the L-arm is 8cm (the distance from the center of the pressure receiver to the center of the load rotating shaft, and the length is a fixed value).
And step three, closing the three-way valve to remove pressure, facing a scale 2 on the rotary column to a base pointer, slowly opening the three-way valve, measuring the starting friction moment of the 2 nd point, recording the pressure value, measuring 10 marking points on each set of bearing by using the same measuring method, recording the pressure values of the 10 marking points, and obtaining the average friction moment value of the 10 measuring points by calculation.
The existing method has the following defects:
1. the measurement efficiency is low, the calculation process is complicated, and the method is not suitable for engineering application;
2. because the glass container is easy to damage, the diameters of the tube walls of the glass container which is replaced after being damaged are not always completely identical, and the pressure value is inaccurate and the measurement result of the friction torque has errors due to calibration according to the original pressure indication scale of the instrument.
Disclosure of Invention
The invention aims to solve the problems that the existing starting friction torque measuring efficiency is low, the calculating process is complicated, and the pressure scale value after a glass container is damaged is inaccurate, and provides a calibration method and a measuring method for the pressure value of a starting friction torque measuring instrument.
The invention relates to a method for measuring the pressure value of a starting friction torque measuring instrument, which comprises the following specific processes:
step 1, acquiring an air pressure value F according to a friction torque standard value and the length of a force arm;
step 2, marking the position, corresponding to the air pressure value F and the liquid plane, on the glass container through an electronic balance;
step 3, calibrating the rotating column of the measuring instrument through the level meter to enable the measuring instrument to keep a horizontal state;
step 4, placing the measured bearing at a measuring position, stably placing a measuring load device on the bearing, keeping the distance between the air pressure nozzle and the pressure receiver at 20mm, enabling the centers of the nozzle and the pressure receiver to be on the same straight line, and slowly opening the three-way valve to enable the liquid level in the glass container to rise to a marking position not exceeding the air pressure value F;
step 5, measuring the friction torque of the measured bearing, stably placing the load measuring device above the measured bearing, aligning the scale 1 on the rotary column with a fixed pointer of the base, and placing the air pressure nozzle at the position 20cm opposite to the pressure receiver;
if the rotation of the pressure receiver relative to the base is larger than or equal to the scale value on the half base, the friction torque of the first mark point is qualified, otherwise, the friction torque of the first mark point is unqualified;
rotating a movable ring of the base, aligning the scale 2 on the rotary column with a fixed pointer of the base, and placing the air pressure nozzle at a position 20mm opposite to the pressure receiver;
if the rotation of the pressure receiver relative to the base is larger than or equal to the scale value on the half base, the friction torque of the second mark point is qualified, otherwise, the friction torque of the second mark point is unqualified;
and 6, continuously measuring the friction torque of the ten marking points according to the method in the step 4, wherein if the friction torque of the ten marking points is qualified, the friction torque of the measured bearing is qualified, and if not, the friction torque of the measured bearing is unqualified.
The invention discloses a calibration method of a pressure value of a starting friction torque measuring instrument, which comprises the following specific steps of:
and vertically downwards placing the air pressure nozzle at a position 20mm away from the precision electronic balance, slowly opening the three-way valve to gradually increase the air source pressure from 0.1g, obtaining an actual pressure value through the precision electronic balance, and calibrating the position of the pressure scale value of the glass container.
The invention has the advantages that: the calibration method for the pressure value of the starting friction torque measuring instrument can accurately calibrate the glass container air pressure indicator, and is quick and convenient to operate; the method for measuring the pressure value of the starting friction torque measuring instrument can accurately evaluate whether the friction torque is qualified or not, saves complicated operation links and measuring time, and greatly improves the detection efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a starting friction torque measuring instrument according to the present invention;
FIG. 2 is a schematic structural diagram of a friction torque measuring instrument started when a measured bearing is in a measuring state;
FIG. 3 is a schematic structural diagram of a starting friction torque measuring instrument in which a pressure receiver drives a measured bearing to rotate under the action of air pressure;
FIG. 4 is a schematic illustration of the calibration of the pressure scale values for glass containers.
Detailed Description
The first embodiment is as follows: the following describes the present embodiment with reference to fig. 1, fig. 2, and fig. 3, and the method for measuring the pressure value of the starting friction torque measuring instrument in the present embodiment includes the following specific processes:
step 1, acquiring an air pressure value F according to a friction torque standard value and the length of a force arm;
step 2, marking the position, corresponding to the air pressure value F and the liquid plane, on the glass container through an electronic balance;
step 3, calibrating the rotating column of the measuring instrument through the level meter to enable the measuring instrument to keep a horizontal state;
step 4, placing the measured bearing at a measuring position, stably placing a measuring load device on the bearing, keeping the distance between the air pressure nozzle and the pressure receiver at 20mm, enabling the centers of the nozzle and the pressure receiver to be on the same straight line, and slowly opening the three-way valve to enable the liquid level in the glass container to rise to a marking position not exceeding the air pressure value F;
step 5, measuring the friction torque of the measured bearing, stably placing the load measuring device above the measured bearing, aligning the scale 1 on the rotary column with a fixed pointer of the base, and placing the air pressure nozzle at the position 20cm opposite to the pressure receiver;
if the rotation of the pressure receiver relative to the base is larger than or equal to the scale value on the half base, the friction torque of the first mark point is qualified, otherwise, the friction torque of the first mark point is unqualified;
rotating a movable ring of the base, aligning the scale 2 on the rotary column with a fixed pointer of the base, and placing the air pressure nozzle at a position 20mm opposite to the pressure receiver;
if the rotation of the pressure receiver relative to the base is larger than or equal to the scale value on the half base, the friction torque of the second mark point is qualified, otherwise, the friction torque of the second mark point is unqualified;
and 6, continuously measuring the friction torque of the ten marking points according to the method in the step 4, wherein if the friction torque of the ten marking points is qualified, the friction torque of the measured bearing is qualified, and if not, the friction torque of the measured bearing is unqualified.
In the embodiment, the three-way valve does not need to be opened and closed repeatedly in the measuring process, so that the operation link and the measuring time are saved. If the liquid level in the glass container changes, the three-way valve is needed to adjust the position of the air pressure value F.
The second embodiment is as follows: this embodiment mode will be further explained as embodiment mode I, step 1The specific process of acquiring the air pressure value F is that the friction torque standard value Mtp and the force arm length L which are 8cm are substituted into a friction torque calculation formula Mtp which is F × L to obtain the air pressure value
In the present embodiment, the friction torque standard value Mtp is obtained by referring to technical standard specifications, and has a unit of g.cm, the air pressure value F has a unit of g, and the arm length is a distance between the center of the pressure receiver and the center of the load rotation axis, and is a fixed value of 8 cm.
The third concrete implementation mode: in this embodiment, the first embodiment is further described, and the specific process of maintaining the horizontal state of the measuring instrument in step 2 is as follows: the level gauge is placed on the upper end face of the rotating column of the measuring instrument, and the horizontal adjusting support column below the base is rotated to enable the balance point of the level gauge to be within the central range.
The fourth concrete implementation mode: in this embodiment, the first embodiment is further explained, before the start of the measurement, the start friction torque measuring instrument uses a precision electronic balance to calibrate the pressure scale value of the glass container
The fifth concrete implementation mode: the following describes the present embodiment with reference to fig. 4, and the specific method for calibrating the pressure scale value in the method for calibrating the pressure value of the starting friction torque measuring instrument in the present embodiment is as follows:
and vertically downwards placing the air pressure nozzle at a position 20mm away from the precision electronic balance, slowly opening the three-way valve to gradually increase the air source pressure from 0.1g, obtaining an actual pressure value through the precision electronic balance, and calibrating the position of the pressure scale value of the glass container.
The sixth specific implementation mode: in this embodiment, the fifth embodiment is further explained, and the calibrated pressure scale values of the glass container include 0.1g, 0.2g, and 0.3 g.
Claims (5)
1. The method for measuring the pressure value of the starting friction torque measuring instrument is characterized by comprising the following specific processes:
step 1, acquiring an air pressure value F according to a friction torque standard value and the length of a force arm;
step 2, marking the position, corresponding to the air pressure value F and the liquid plane, on the glass container through an electronic balance;
step 3, calibrating the rotating column of the measuring instrument through the level meter to enable the measuring instrument to keep a horizontal state;
step 4, placing the measured bearing at a measuring position, stably placing a measuring load device on the bearing, keeping the distance between the air pressure nozzle and the pressure receiver at 20mm, enabling the centers of the nozzle and the pressure receiver to be on the same straight line, and slowly opening the three-way valve to enable the liquid level in the glass container to rise to a marking position not exceeding the air pressure value F;
step 5, measuring the friction torque of the measured bearing, stably placing the load measuring device above the measured bearing, aligning the scale 1 on the rotary column with a fixed pointer of the base, and placing the air pressure nozzle at the position 20cm opposite to the pressure receiver;
if the rotation of the pressure receiver relative to the base is larger than or equal to the scale value on the half base, the friction torque of the first mark point is qualified, otherwise, the friction torque of the first mark point is unqualified;
rotating a movable ring of the base, aligning the scale 2 on the rotary column with a fixed pointer of the base, and placing the air pressure nozzle at a position 20mm opposite to the pressure receiver;
if the rotation of the pressure receiver relative to the base is larger than or equal to the scale value on the half base, the friction torque of the second mark point is qualified, otherwise, the friction torque of the second mark point is unqualified;
and 6, continuously measuring the friction torque of the ten marking points according to the method in the step 4, wherein if the friction torque of the ten marking points is qualified, the friction torque of the measured bearing is qualified, and if not, the friction torque of the measured bearing is unqualified.
2. The method for measuring the pressure value of the starting friction torque measuring instrument according to claim 1, wherein the step 1 of obtaining the air pressure value F specifically comprises the step of substituting a friction torque standard value Mtp and a force arm length L of 8cm into a friction torque calculation formula Mtp F × L to obtain the air pressure value
3. The method for measuring the pressure value of the starting friction torque measuring instrument according to claim 1, wherein the specific process of keeping the measuring instrument in the horizontal state in the step 2 is as follows: the level gauge is placed on the upper end face of the rotating column of the measuring instrument, and the horizontal adjusting support column below the base is rotated to enable the balance point of the level gauge to be within the central range.
4. The method for measuring the pressure value of the starting friction torque measuring instrument according to claim 1, wherein the starting friction torque measuring instrument calibrates the pressure scale value of the glass container by using a precision electronic balance before starting measurement.
5. The calibration method for the pressure value of the starting friction torque measuring instrument is characterized in that the specific method for calibrating the pressure scale value is as follows:
and vertically downwards placing the air pressure nozzle at a position 20mm away from the precision electronic balance, slowly opening the three-way valve to gradually increase the air source pressure from 0.1g, obtaining an actual pressure value through the precision electronic balance, and calibrating the position of the pressure scale value of the glass container.
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| CN201811278371.0A CN109186856B (en) | 2018-10-30 | 2018-10-30 | Calibration method and measurement method for pressure value of starting friction torque measuring instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111006864B (en) * | 2019-11-22 | 2022-04-05 | 中国航发西安动力控制科技有限公司 | Spline shaft flexibility detection method and detection tool |
| CN113310623B (en) * | 2021-06-08 | 2023-03-17 | 洛阳Lyc汽车轴承科技有限公司 | Hub bearing friction torque measurement equipment calibration device and calibration method |
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