CN114167098A - Method for adjusting clearance of active system of current ratio meter - Google Patents
Method for adjusting clearance of active system of current ratio meter Download PDFInfo
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- CN114167098A CN114167098A CN202111179188.7A CN202111179188A CN114167098A CN 114167098 A CN114167098 A CN 114167098A CN 202111179188 A CN202111179188 A CN 202111179188A CN 114167098 A CN114167098 A CN 114167098A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000002146 bilateral effect Effects 0.000 claims abstract description 3
- 238000012216 screening Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 239000010437 gem Substances 0.000 description 12
- 229910001751 gemstone Inorganic materials 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
Abstract
The invention relates to a clearance adjusting method for a movable system of an ammeter, which comprises the following steps: fixing the current ratio meter to be regulated by using a clamp, rotating the regulating bearing to enable a movable system of the current ratio meter to be in a state of larger gap, and enabling the pointer to rotate uniformly and flexibly without clamping stagnation and hysteresis; switching on a power supply to keep the current ratio meter in a working state, and enabling the pointer to swing in a bilateral symmetry mode at the midpoint position; rotating the adjusting bearing until the pointer begins to swing to generate a clamping stagnation phenomenon, and marking the position as a reference position of the clearance of the movable system; turning off the power supply, rotating the adjusting bearing to the back-off position calculated by the screw pitch p, electrifying to verify whether the state and the swing amplitude of the pointer meet the requirement of the clearance of the movable system, and if not, repeating the steps 2 to 4 until the clearance of the movable system meets the requirement; the mark here location is the callback location and checked. Compared with the prior art, the method is more accurate depending on hand feeling adjustment, and solves the problem of poor consistency and accuracy of the gap adjustment of the active system of the galvanometer.
Description
Technical Field
The invention relates to the field of performance test methods of aircraft instruments, in particular to a method for adjusting a clearance of a movable system of a current ratio meter.
Background
The structure and the characteristics of the current ratio meter are shown in figure 1, and the structure comprises the following components: pointer, bridge plate 1, adjusting bearing 8, support 7 and open magnetic screen 5. Two pairs of fixed coils Q13, Q24 intersecting at an angle of 120 degrees; as shown in figure 2, the movable system 2 is arranged in the movable system 2, the movable system 2 consists of a pointer, a connecting shaft 11, a rotary magnet 10 and an upper shaft tip 9 and a lower shaft tip 12, the shaft tips at two ends are respectively supported by a bridge plate 1 and a pair of jewel bearings 6 fixed on a damper, and only the movable system 2 can rotate freely. The moving system 2 performs accurate balancing by adjusting the position of the counterweight. The damper is made of copper material, and the rotating magnet 10 generates eddy current on the damper, and the magnetic field of the eddy current interacts with the rotating magnet 10 to apply a braking torque opposite to the moving direction of the rotating magnet 10 all the time, so that the damping effect is achieved (namely, only the swing amplitude is reduced, and finally the rotating magnet is stationary at a certain position). The open magnetic screen 5 is made of a soft magnetic material with high magnetic permeability. The magnetic field interference prevention device mainly has the functions of preventing the interference of an external magnetic field to the internal magnetic field of the current ratio meter and preventing the internal magnetic field of the current ratio meter from influencing the normal operation of other nearby meters. The current ratio meter has no mechanism for generating a reaction torque, and the movable portion of the current ratio meter is in an equilibrium state when the rotary magnet 10 stays in the direction of the resultant magnetic field. Because it has no conductive balance spring and moving coil, it is simple in structure, reliable in use, small in volume, and very suitable for use as aviation instrument for measuring signal strength.
The working principle of the current ratio meter is as follows: in operation, the input signal of the sensor is converted by the signal processing circuit to form signal current and drive the two sets of coils Q13 and Q24 to generate respective magnetic fields. The two groups of coils work in a differential mode, and the magnetic fields of the two groups of coils are synthesized to form corresponding signal magnetic fields. When the sensor signal is minimum, the signal magnetic field points to the 0-reticle direction; the signal magnetic field points in the direction of the largest reticle when the signal is at a maximum. Under the traction of the signal magnetic field, the pointer points to the direction of the signal magnetic field, and the function of indicating the signal size of the sensor is realized.
The gap of the active system 2 of the current ratio meter is related to the swing of the pointer: it is difficult to directly measure the gap size of the galvanometer moving system 2, but the gap size can be reflected by the swinging condition of the pointer in the working state of the galvanometer. As can be seen from figure 2, the active system 2 of the galvanometer has an upper and a lower tip, which are free to move within the jewel bearing 6 when mounted in the galvanometer. Under an ideal state (namely, the shaft tip is smooth and has no abrasion, and the jewel bearing has no crack or scratch), when the gap distance is reduced to a certain degree (if the upper shaft tip 9 is lightly touched with the jewel bearing 6, the shaft tip is not abraded, or the shaft tip is abraded by the jewel bearing) by rotating the adjusting bearing 8 at the upper end, the jewel bearing 6 obstructs the movement of the shaft tip to generate friction torque, and the swinging of the pointer of the galvanometer has clamping stagnation and hysteresis phenomena under the working state. Furthermore, the wear of the upper shaft tip 9 is increased by the close distance to the jewel bearing 6 when the subsequent vibratory screening is performed. When the clearance of the active system 2 of the current ratio meter is in a proper range, the upper shaft tip 9 is not subjected to friction torque, and the needle of the current ratio meter swings and rotates uniformly without stagnation under the working state. When the clearance of the galvanometer moving system 2 exceeds the proper range, although the pointer of the galvanometer still rotates uniformly and does not stop in the working state, when the galvanometer pointer is installed into a meter and then is subjected to vibration screening, the amplitude of the pointer swing is gradually increased along with the increase of time, and the fatigue degree of the pointer is increased until the pointer fracture fault occurs.
At present, the link of the gap of the active system of the galvanometer mainly depends on hand feeling adjustment, and because the experience and the feeling of operators are different and no more standard checking and inspecting means exists, the consistency and the accuracy of the gap adjustment are poorer even if a standard sample piece is used as a reference. Therefore, the adjustment of the clearance of the active system of the current ratio meter becomes an urgent problem to be solved.
Disclosure of Invention
The invention provides a clearance adjusting method for a movable system of a current ratio meter, which aims to solve the problems.
The invention achieves the above purpose through the following technical scheme, and the adjusting method comprises the following steps: s1, fixing the current ratio meter to be adjusted by using a clamp, rotating the adjusting bearing 8 to enable the movable system 2 to be in a state with larger clearance, and enabling the pointer to rotate uniformly and flexibly without clamping stagnation and hysteresis; s2, switching on the power supply to keep the current ratio meter in the working state, and swinging the pointer in bilateral symmetry at the midpoint position; s3, rotating the adjusting bearing 8 until the pointer begins to swing to generate a clamping stagnation phenomenon, and marking the position as a reference position of the clearance of the movable system 2; s4, turning off the power supply, rotating the adjusting bearing 8 to the back-off position calculated by the screw pitch p, electrifying to verify whether the pointer state and the swing amplitude meet the gap requirement of the movable system 2, if not, repeating the steps S2 to S4 until the requirement is met; s5, marking the position as the callback position and checking.
Preferably, the method for calculating the readjustment position by adjusting the pitch p of the bearing 8 is as follows: according to the required reasonable gap value delta, an auxiliary scribed line is drawn on the bridge plate 1 of the current ratio meter to divide the bridge plate into N equal parts, wherein N is an integer, and N is an even number, the position is adjusted back to the reference position in the step S3 to rotate counterclockwise by 2 equal parts and then rotate clockwise by 1 equal part.
Preferably, the method for verifying that the state and swing of the pointer meet the gap requirement includes: the pointer in the low, high and normal temperature state should rotate uniformly without stagnation; and the galvanometer is arranged on a finished meter, and the pointer swings to be less than or equal to +/-1 line in a small amplitude and swings to be less than or equal to +/-1.5 line in a large amplitude in the vibration screening process in 10 minutes.
Preferably, the reference position is marked by marking the reference position on the scribed line of the bridge plate 1 corresponding to the groove of the adjustment bearing 8.
Preferably, the method of turning on the power supply is to connect the current ratio meter with a signal generator, a driving circuit device and a dc stabilized power supply, the dc stabilized power supply outputs a voltage to the driving circuit device, the signal generator outputs a control signal to the driving circuit device, and the other end of the driving circuit device outputs a converted signal to the current ratio meter.
Preferably, after marking the set back position, it is checked whether the spacing between the reference position and the set back position is 1 quarter and whether the adjusting bearing 8 is locked.
Preferably, the reasonable value delta of the gap is determined by the results of the process vibration screening test which is carried out by loading current ratio meters of different gaps into a table.
Preferably, the pointer swing position, the amplitude and the frequency of the current ratio meter in the working state are all controlled by a signal generator.
The invention has the beneficial effects that:
the invention provides a method for adjusting clearance of a movable system in an amperemeter working state, which combines theoretical calculation of the pitch of an adjusting bearing and the angle of a bridge plate to obtain more accurate clearance corresponding relation and determines a reasonable range of the clearance size through experimental verification. The interval between the reference position and the readjustment position can be used for checking the clearance adjustment condition, and the consistency and the accuracy of the clearance adjustment are ensured. The problem that in the prior art, the hand feeling of field operators is used for adjusting the gap, and the experience and the feeling of the operators are different, so that the consistency and the accuracy are poor can be solved.
Drawings
FIG. 1 is a schematic view of a structure of a current ratio meter.
Fig. 2 is a schematic diagram of the structure of the mobile system.
Fig. 3 is a schematic view of the bridge plate divided equally by an angle.
Fig. 4 is a schematic diagram of system electrical connections.
FIG. 5 is a pin connection diagram of the driving circuit.
FIG. 6 is a graph comparing the results of process vibration screening performed by the current ratio meter with different gaps.
In fig. 1: 1. bridge plate, 2 moving system, 3 coil Q1, 4 coil Q2, 5 open magnetic screen, 6 jewel bearing, 7 support, 8 adjusting bearing.
In fig. 2: 9. the upper shaft point, 10 rotating magnets, 11 connecting shafts and 12 lower shaft points.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are illustrative of preferred embodiments of the invention, but the invention is not limited to the above embodiments, and any obvious modifications, substitutions or changes made by those skilled in the art without inventive faculty are within the scope of the invention.
The specific embodiment is as follows:
referring to fig. 1 and 2, the galvanometer moving system 2 consists of a pointer, a connecting shaft 11, a rotating magnet 10 and shaft tips (an upper shaft tip 9 and a lower shaft tip 12) at two ends, wherein the shaft tips are respectively supported by a galvanometer bridge plate 1 and a pair of jewel bearings 6 on a damper. The method utilizes the characteristics of the movable system 2, judges the reference position of the minimum gap between the jewel bearing 6 and the upper shaft tip 9 according to the friction force between the jewel bearing and the upper shaft tip 9 in the working state of the current ratio meter, and then adjusts the adjusting bearing back to the adjusting position calculated according to the thread pitch of the adjusting bearing, so as to meet the requirement of the gap of the movable system 2.
In order to determine the reasonable range of the clearance, 5 certain type current ratio meters with different clearance sizes of the movable system 2 are respectively installed on a finished table to carry out vibration screening tests, and the test results are shown in figure 6. When the gap is larger (about 0.03mm) or smaller (about 0.01mm), the swing amplitude of the pointer of the current ratio meter is increased to different degrees after vibrating for a period of time (less than or equal to 10min), namely, the small swing exceeds a plus or minus 1 reticle, and the large swing exceeds a plus or minus 1.5 reticle. And the change of the current ratio meter pointer swing is small when the gap is in the range of about 0.02 mm. From this, it was confirmed that the gap amount of 0.02mm is a reasonable range for this type current ratio meter.
Therefore, the gap is adjusted by adopting a method of determining a reference position and a back-off position by drawing an auxiliary scribed line on the current ratio bridge plate 1, the current ratio bridge plate 1 is divided into 16 equal parts, and the corresponding gap of the equal part obtained by dividing is about 0.02 mm. The calculation method comprises the following steps: the pitch p of the adjusting bearing is 0.35mm, the angle α between the scribes is 360/16-22.5 °, corresponding to the gap variation Δ: 0.35 × 22.5/360 ≈ 0.021875mm ≈ 0.02 mm. The bridge plate 1 is shown in an angular bisected schematic view in fig. 3.
As shown in fig. 4, in this embodiment, the regulating system is composed of a dc regulated power supply, a driving circuit device, and a signal generator. The driving circuit device is powered by adopting a mode that a direct current stabilized voltage supply outputs +15V voltage, and the signal generator outputs a control signal to the driving circuit device, and the internal connection schematic diagram of the signal generator is shown in figure 5. The other end of the driving circuit device outputs the converted signal to the current ratio meter. The swinging position, amplitude and frequency of the pointer under the working state of the current ratio meter are controlled by the signal generator.
The specific operation method comprises the following steps:
1. preparation before adjustment
The current ratio meter to be regulated is fixed by using a gap adjusting clamp, and the current ratio meter is connected with a signal generator, a circuit driving device and a direct current stabilized power supply according to the graph of fig. 4. The fastening nut is loosened, the adjusting bearing 8 is rotated to enable the moving system 2 to be in a free state with larger clearance, and at the moment, the pointer is rotated uniformly and flexibly without clamping stagnation and hysteresis. After the power is switched on, the signal generator is adjusted to enable the pointer of the current ratio meter to swing symmetrically left and right at the midpoint position, the swinging position, the amplitude and the frequency are controlled by the signal generator, and the current ratio meter is kept in the working state, wherein the reference value of the signal generator in the embodiment is direct current offset (offset)1.35V, alternating current amplitude (Ampl)0.3V and frequency (Freq) 0.5 Hz. The output of the signal generator can be properly adjusted according to the actual swinging condition of the pointer so as to facilitate the operation.
2. Determining a reference position
Firstly, an adjusting bearing 8 on the bridge plate is rotated clockwise by using an adjusting gap wrench, so that a jewel bearing 6 at the bottom of the adjusting bearing is lightly touched with an upper shaft tip 9 of a current ratio meter, and if the pointer swings and has obvious clamping stagnation, the reference position is marked on a reticle of the bridge plate 1 corresponding to a groove of the adjusting bearing 8.
3. Clearance adjustment
And (3) turning off a power supply, rotating the adjusting bearing 8 anticlockwise by 2 equal parts and then clockwise by 1 equal part by using a gap adjusting wrench according to the scribed line on the bridge plate 1, and adjusting the gap of the pointer to about 0.02 mm. And (3) switching on the power supply, wherein the rotating state and the swing amplitude of the pointer are the same as the preparation state before the gap is adjusted, and if the rotating state and the swing amplitude are not in accordance with the requirements, repeating the steps of preparation before the gap is adjusted, determining the reference position and adjusting the gap. Until the clearance adjustment meets the requirements.
4. Determining callback location
After the gap is adjusted to be qualified, the pointer should rotate uniformly without stagnation. Marking the scribed lines of the bridge plate 1 corresponding to the grooves on the adjusting bearing 8 at this time, namely, the adjusted positions.
5. Amperometric conditioning
Finishing a current ratio meter, using TB 06-9 point seal on an adjusting bearing, locking a special nut, and finishing the appearance.
6. Rechecking and inspecting
The interval between the reference position of the check mark and the callback position is equal to 1; the pointer should rotate uniformly and have no stagnation phenomenon in the working state. The inspection requirements are the same.
The test effect is as follows: after the current ratio meter for adjusting the clearance of the movable system is assembled into an indicator by the method, a vibration model test with the time of 6.5H (including functional vibration with the time of 1H and durable vibration with the time of 5.5H) is carried out according to the environmental technical requirements of finished accessories of certain airplanes, and the verification results are shown in Table 1.
It can be seen that when the gap of the active system of the current ratio meter is controlled to be in the range of 0.8 to 1.5 equal parts (i.e. about 0.02 mm), the pointer swings less and is stable during vibration. After the method is applied to a certain indicator which fails in the regular inspection, the indicator breakage fault does not occur when the regular inspection test is carried out again.
Claims (8)
1. A method for adjusting clearance of a movable system of a current ratio meter is characterized by comprising the following steps: s1, fixing the current ratio meter to be adjusted by using a clamp, rotating the adjusting bearing (8) to enable the movable system (2) to be in a state with larger clearance, and enabling the pointer to rotate uniformly and flexibly without clamping stagnation and hysteresis; s2, switching on the power supply to keep the current ratio meter in the working state, and swinging the pointer in bilateral symmetry at the midpoint position; s3, rotating the adjusting bearing (8) until the pointer begins to generate a clamping stagnation phenomenon, and marking the position as a reference position of the clearance of the movable system (2); s4, turning off the power supply, rotating the adjusting bearing (8) to the back-off position calculated by the screw pitch p, electrifying to verify whether the pointer state and the swing amplitude meet the requirement of the clearance of the movable system (2), if not, repeating the steps S2 to S4 until the requirement is met; s5, marking the position as the callback position and checking.
2. A galvanometer active system clearance adjustment method, according to claim 1, characterized in that said method of calculating the position of the adjustment back from the pitch p of the adjustment bearing (8) is: and according to the required reasonable gap value delta, drawing an auxiliary scribed line on the bridge plate (1) of the current ratio meter to divide the bridge plate into N equal parts, wherein N is an integer, and N is an even number, and the readjusted position is that the reference position in the step S3 rotates anticlockwise for 2 equal parts and then rotates clockwise for 1 equal part.
3. The method for adjusting clearance of an active system of a galvanometer according to claim 1, wherein the method for verifying that the state and swing of the pointer meet the clearance requirement is as follows: the pointer in the low, high and normal temperature state should rotate uniformly without stagnation; and the galvanometer is arranged on a finished meter, and the pointer swings to be less than or equal to +/-1 line in a small amplitude and swings to be less than or equal to +/-1.5 line in a large amplitude in the vibration screening process in 10 minutes.
4. A method of gap adjustment for a galvanometer moving system according to claim 1, characterized in that the reference position is marked on the scribe line of the bridge plate (1) corresponding to the adjustment bearing groove (8).
5. The method for adjusting clearance between an active system of a current ratio meter and a current ratio meter as claimed in claim 1, wherein the power is turned on by connecting the current ratio meter with a signal generator, a driving circuit device and a DC stabilized power supply, the DC stabilized power supply outputs voltage to the driving circuit device, the signal generator outputs control signal to the driving circuit device, and the other end of the driving circuit device outputs converted signal to the current ratio meter.
6. A galvanometer active system clearance adjustment method according to claim 1, characterized in that after marking the adjusted position, it is checked whether the spacing of the reference position from the adjusted position is 1 equal division and whether the adjustment bearing (8) is locked.
7. An ammeter gap adjustment method as claimed in claim 2, wherein the gap reasonable value Δ is determined by loading different gap ammeters into a table to perform a process vibration screening test.
8. A method for adjusting gap between movable systems of galvanometer according to claim 1, characterized in that the oscillating position, amplitude and frequency of the pointer of the galvanometer under working condition are controlled by the signal generator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111179188.7A CN114167098A (en) | 2021-10-09 | 2021-10-09 | Method for adjusting clearance of active system of current ratio meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111179188.7A CN114167098A (en) | 2021-10-09 | 2021-10-09 | Method for adjusting clearance of active system of current ratio meter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB392053A (en) * | 1932-09-19 | 1933-05-11 | Cyril Frank Elwell | An improved method of and means for measuring the modulation of electric currents |
| GB527039A (en) * | 1939-03-29 | 1940-10-01 | Hans Fraenkel | Improvements in and relating to electric measuring instruments |
| GB8917905D0 (en) * | 1988-11-09 | 1989-09-20 | Yazaki Corp | Cross coil type indicator |
| CN203259595U (en) * | 2013-03-20 | 2013-10-30 | 南昌工程学院 | Full-automatic digital megohmmeter |
| CN203605954U (en) * | 2013-11-27 | 2014-05-21 | 武汉航空仪表有限责任公司 | Quotient meter circuit |
| CN106989913A (en) * | 2017-05-24 | 2017-07-28 | 哈尔滨工业大学（威海） | Sliding block and the adjustable prismatic pair experimental simulation device of guide clearance |
| CN112781642A (en) * | 2020-12-30 | 2021-05-11 | 北京青云航空仪表有限公司 | Calibration method of pointer instrument |
-
2021
- 2021-10-09 CN CN202111179188.7A patent/CN114167098A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB392053A (en) * | 1932-09-19 | 1933-05-11 | Cyril Frank Elwell | An improved method of and means for measuring the modulation of electric currents |
| GB527039A (en) * | 1939-03-29 | 1940-10-01 | Hans Fraenkel | Improvements in and relating to electric measuring instruments |
| GB8917905D0 (en) * | 1988-11-09 | 1989-09-20 | Yazaki Corp | Cross coil type indicator |
| CN203259595U (en) * | 2013-03-20 | 2013-10-30 | 南昌工程学院 | Full-automatic digital megohmmeter |
| CN203605954U (en) * | 2013-11-27 | 2014-05-21 | 武汉航空仪表有限责任公司 | Quotient meter circuit |
| CN106989913A (en) * | 2017-05-24 | 2017-07-28 | 哈尔滨工业大学（威海） | Sliding block and the adjustable prismatic pair experimental simulation device of guide clearance |
| CN112781642A (en) * | 2020-12-30 | 2021-05-11 | 北京青云航空仪表有限公司 | Calibration method of pointer instrument |
Non-Patent Citations (2)
| Title |
|---|
| 林良清 等: "对05005型兆欧表流比计的改进", 《电子技术》, 31 December 1964 (1964-12-31), pages 22 - 23 * |
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