CN114252004A - Sleeve gear tooth side clearance measuring device and method based on resistance measurement - Google Patents
Sleeve gear tooth side clearance measuring device and method based on resistance measurement Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
- G01B7/146—Measuring on gear teeth
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Abstract
The invention belongs to the technical field of measurement of side clearance of a set gear, and particularly relates to a device and a method for measuring the side clearance of the set gear based on resistance measurement. The invention overcomes the defects of large operation workload, time consumption of reading and easy generation of thick measurement errors of the existing measurement method for manually adjusting the thickness of a feeler gauge tooth by tooth and performing the feeler measurement tooth by tooth. The invention has short measuring time, reading block of measuring result, stable measuring error and can reduce the error as much as possible by calibration before measurement.
Description
Technical Field
The invention belongs to the technical field of measurement of side clearance of a set gear, and particularly relates to a device and a method for measuring the side clearance of the set gear based on resistance measurement.
Background
The tooth side clearance is an important parameter of the tooth clutch, and due to the existence of tooth pitch processing error, concentricity error and installation error, the tooth side clearance of each tooth of the tooth clutch cannot be completely equal to the theoretical size, particularly, the tooth side clearance of a large-scale tooth clutch reaches the level of 1.6mm, the tooth side clearance error reaches the level of 0.3mm, and whether the tooth side clearances of the teeth at different positions on the circumference of the tooth clutch are uniform or not needs to be checked during actual use. The existing method for measuring the tooth side clearance of the tooth clutch sleeve mainly adopts a feeler gauge to measure and record tooth by tooth. When the reference circle of the teeth of the gear clutch is large and the number of the teeth of the gear clutch is large, the thickness of the feeler gauge is adjusted tooth by tooth, and the feeler gauge is plugged and measured tooth by tooth, so that time is consumed, in addition, the tightness degree of the feeler gauge is judged mainly by depending on hand feeling, the hand fatigue can be caused by long-time measurement, and the measurement error is increased.
Disclosure of Invention
The invention aims to overcome the defects of large operation workload, time consumption of reading and easy generation of thick measurement errors of the conventional measurement method for manually adjusting the thickness of a feeler gauge tooth by tooth and performing measurement on the feeler gauge tooth by tooth, and provides a device and a method for measuring the tooth side clearance of a set tooth based on resistance measurement.
A sleeve gear tooth side gap measuring device based on resistance measurement comprises a digital multimeter, a support sheet insulation plate, a resistance barrel, a spring pin and a spring; the support sheet is in a long and thin strip shape, and a support sheet conductive plate is embedded in a groove on the outer surface of the lower part of the support sheet; the resistance barrel is arranged at the front end of the support sheet and is positioned above the support sheet current-conducting plate; the resistance barrel is cylindrical, and the bottom of the resistance barrel is provided with a through hole; the spring pin is arranged in the resistance barrel, the head of the spring pin is matched with a through hole at the bottom of the resistance barrel, and the tail part of the spring pin with the elastic sheet is always in contact with the inner wall of the resistance barrel; the support sheet insulating plate is embedded in the support sheet conducting plate and is positioned below the resistance barrel; the spring is arranged between the support sheet insulating plate and the spring pin cavity; the front end of the supporting sheet extends into a tooth side gap of the set tooth to be measured, the bottom surface of the supporting sheet is in contact with the outer tooth of the set tooth to be measured, and the cambered surface of the head of the spring pin is in contact with the inner tooth of the set tooth to be measured;
one end of the digital multimeter is connected with the inner teeth of the sleeve teeth to be measured, and the other end of the digital multimeter is connected with the support piece conductive plate; when the elastic sheet at the tail part of the spring pin is contacted with different positions of the inner wall of the resistance barrel, the effective length of current flowing through the resistance barrel is changed, so that the resistance is changed, and the digital multimeter can accurately display the change of the resistance value; the resistance reading of the digital multimeter has positive correlation with the tooth side clearance of the set teeth to be measured.
Further, the support sheet is made of an insulating material; the surface layer of the support sheet conductive plate is coated with an insulating material; the surface of the spring pin, which is in contact with the support sheet conducting plate, and the surface of the spring pin, which is in contact with the through hole at the bottom of the resistance barrel are coated with insulating materials; the contact part of the elastic sheet at the tail part of the spring pin and the inner barrel wall of the resistance barrel, and the contact part of the cambered surface at the head part of the spring pin and the inner teeth of the sleeve teeth to be measured are not coated with insulating materials; the contact part of the spring and the support piece conductive plate is made of non-conductive materials.
Furthermore, the tail part of the spring pin is cylindrical, and elastic sheet mounting grooves are uniformly distributed along the circumferential direction of the tail part of the spring pin; the elastic sheets are respectively inserted into the elastic sheet mounting grooves at the tail part of the spring pin, so that the outward expansion trend is integrally formed; the elastic sheet has elasticity, and when the spring pin moves up and down, the elastic sheet is always in contact with the inner wall of the resistance barrel.
A method for measuring the side clearance of a set tooth based on resistance measurement comprises the following steps:
step 1: acquiring a resistance measurement value experiment data table of the corresponding digital multimeter when the front end of the supporting sheet is arranged in gaps with different distances through a calibration experiment;
step 2: the front end of a support sheet extends into a tooth side gap of the set tooth to be measured, the bottom surface of the support sheet is in contact with the outer tooth of the set tooth to be measured, and the cambered surface of the head of the spring pin is in contact with the inner tooth of the set tooth to be measured; connecting one end of a character multimeter with the inner teeth of the sleeve teeth to be measured, and connecting the other end of the character multimeter with the support piece current conducting plate;
and step 3: and (3) reading the resistance measurement value of the digital multimeter, and comparing the resistance measurement value with the experimental data table obtained in the step 1 to obtain the tooth side clearance measurement value of the set tooth to be measured.
Further, the method for performing the calibration experiment in the step 1 specifically comprises the following steps:
step 1.1: the front end of the support sheet is arranged between a movable measuring head and a fixed measuring head of the digital display micrometer, and the bottom surface of the support sheet and the cambered surface of the head part of the spring pin are respectively contacted with the movable measuring head and the fixed measuring head of the digital display micrometer; one end of a digital multimeter is connected with a fixed measuring head of the digital micrometer, and the other end of the digital multimeter is connected with a support piece conductive plate;
step 1.2: adjusting the distance between a movable measuring head and a fixed measuring head of the digital display micrometer to obtain the resistance measuring value of the digital multimeter, wherein the distance value between the movable measuring head and the fixed measuring head is directly obtained by a digital display window of the digital display micrometer;
step 1.3: and (3) repeatedly executing the step 1.2, and acquiring a resistance measurement value experiment data table corresponding to different distance values between the movable measuring head and the fixed measuring head.
The invention has the beneficial effects that:
according to the invention, the spring pin is arranged in the thickness direction of the sheet, when the gap is large, the spring pin automatically pops out, when the gap is small, the spring pin automatically retracts, one end of the spring pin is contacted with one tooth side of the sleeve tooth, the other end of the spring pin is arranged in the resistance barrel on the sheet, when the spring pin moves, the elastic sheet at the tail part of the spring pin is contacted with different positions in the cylindrical resistance barrel, and the size of popping out or retracting of the spring pin can be judged by measuring the resistance change of the resistance barrel through a digital multimeter. The invention has short measuring time, reading block of measuring result, stable measuring error and can reduce the error as much as possible by calibration before measurement.
Drawings
Fig. 1 is a set tooth structure diagram of a tooth clutch.
FIG. 2 is a schematic illustration of the backlash of the set teeth.
FIG. 3 is a longitudinal sectional view of a backlash measuring device of the present invention, the backlash being 1.25 mm.
Fig. 4 is a partially enlarged left side view of fig. 3.
FIG. 5 is a view showing a structure of a tail portion of a spring pin of the backlash measuring apparatus according to the present invention.
FIG. 6 is a longitudinal sectional view of a backlash measuring device of the present invention, the backlash being 1.5 mm.
Fig. 7 is a partially enlarged left side view of fig. 6.
FIG. 8 is a longitudinal sectional view of a backlash measuring device of the present invention, the backlash being 2.0 mm.
Fig. 9 is a partially enlarged left side view of fig. 8.
Fig. 10 is a plan view of fig. 3 (as viewed from the spring pin side).
Fig. 11 is a bottom view of fig. 3 (as viewed from the side of the support sheet conductive plate).
FIG. 12 is a schematic diagram of the digital micrometer.
FIG. 13 is a schematic diagram of a calibration experiment of the backlash measurement method of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
In fig. 1, the internal teeth 200 and the external teeth 210 of the gear component of the large-scale tooth clutch are both straight teeth, the tooth number, the module, the pressure angle and other key tooth shape parameters of the two teeth are completely equal, the axes are completely overlapped, the internal teeth 200 and the external teeth 210 are nested with each other in the axial direction to form a set gear pair, and the torque can be transmitted between the internal teeth 200 and the external teeth 210 in two directions.
In fig. 2, there are many teeth on the inner teeth 200 and the outer teeth 210, there are side clearances 220, 230 between each tooth, when there is a deviation between the axes of the inner teeth 200 and the outer teeth 210, the values of the side clearances 220 and the side clearances 230 are not equal, and by measuring the side clearances of the teeth with different numbers, it can be determined that the axes of the inner teeth 200 and the outer teeth 210 are deviated.
At present, the clearance between the tooth sides of the large-scale tooth type clutch set tooth is mostly measured by adopting a feeler gauge one by one, special checking equipment is not needed, the feeler gauge has the advantages of simplicity and flexibility, the defects are obvious, the thickness of the feeler gauge needs to be manually adjusted for many times when one tooth is measured, the measuring time is long, the tightness degree of the feeler gauge is sensed by hand feeling during measuring, and errors are easily generated. In order to overcome the defects that the operation workload is large, reading time is consumed, and thick measurement errors are easily generated in the conventional measurement method for manually adjusting the thickness of a feeler gauge tooth by tooth and performing the feeler measurement tooth by tooth, the invention provides a sleeve tooth side gap measurement device based on resistance measurement, which has the advantages of self-adaption of gaps, no need of manual adjustment, quick reading of measurement results and stable errors.
Example 1:
in fig. 3 and 4, an elongated support piece 300 made of an insulating material (e.g., engineering plastic) has a handle 310 mounted at one end for easy handling, and a resistance barrel 340 and a spring pin 350 mounted at the other end. The support sheet conductive plate 320 is embedded in a groove on the outer surface of the lower portion of the support sheet 300, and the surface layer of the support sheet conductive plate 320 is coated with materials such as insulating paint to realize electrical insulation. A cylindrical resistor barrel 340 is mounted over the support plate conductive plate 320 at the front end of support plate 300. The bottom of the resistance barrel 340 is provided with a through hole, the diameter of the through hole is smaller than that of the inner barrel wall of the resistance barrel 340, and the structure forms a step of a concentric circle. The head of the spring pin 350 of the ladder hollow shaft structure made of the conductive metal material is matched with the through hole at the bottom of the resistance barrel 340, and the tail of the spring pin 350 with the elastic fin is always in contact with the inner wall of the resistance barrel 340. The spring 360 is placed between the support plate insulation plate 330 at the front end of the support plate 300 and the spring pin cavity 390. The support sheet insulating plate 330 is embedded in the support sheet conductive plate 320. The surface of the spring pin 350 in contact with the support piece conductive plate 320 and the surface of the spring pin in contact with the through hole at the bottom of the resistor barrel 340 are coated with insulating paint and other materials to realize electrical insulation, the contact part of the tail elastic sheet 410 of the spring pin and the inner barrel wall of the resistor barrel 340 is free of insulating paint, and the contact part of the cambered surface at the head of the spring pin 350 and the inner teeth 200 is free of insulating paint. The contact part of the spring 360 and the supporting sheet conductive plate 320 is made of non-conductive material.
The digital multimeter 100 selects an ohmic gear, the multimeter anode wiring 120 is connected with the inner teeth 200, the multimeter cathode wiring 110 is connected with the support piece conductive plate 320, current returns to the negative pole of the multimeter from the positive pole of the multimeter through the multimeter anode wiring 120, the spring pin 350, the resistance barrel 340, the support piece conductive plate 320 and the multimeter cathode wiring 110 to form a passage, and the digital multimeter 100 displays the resistance value of the current passage on a dial plate through digital display. Because each link on the current path is a good electrical conductor, and the resistance barrel 340 is made of a material with a large resistance, when the tail of the spring pin 350 contacts with different positions of the inner wall of the resistance barrel 340, the effective length of the current flowing through the resistance barrel 340 changes, so that the resistance changes, and the digital multimeter 100 can accurately display the change of the resistance value.
Fig. 3 and 4 show that when the minimum clearance is measured, the cambered surface of the head of the spring pin 350 is in contact with the internal teeth 200, the tail of the spring pin 350 is in contact with the supporting sheet conductive plate 320, the length of current flowing through the resistance barrel 340 is shortest, and the multimeter resistance reading is also smallest.
Fig. 6 and 7 show that when the middle gap is measured, the arc surface of the head of the spring pin 350 is in contact with the inner teeth 200, the tail of the spring pin 350 leaves the support piece conductive plate 320 under the reset force of the spring 360, the length of current flowing through the resistance barrel 340 is increased, and the resistance reading of the multimeter is also increased.
Fig. 8 and 9 show that when the maximum gap is measured, the arc surface of the head of the spring pin 350 is in contact with the inner teeth 200, the tail of the spring pin 350 leaves the support piece conductive plate 320 under the action of the reset force of the spring 360, the spring pin 350 is limited by the shoulder at the bottom of the resistance barrel 340 and does not extend, the length of current flowing through the resistance barrel 340 is maximum, and the resistance reading of the multimeter is also maximum.
When tooth gaps 230 are different, multimeter 100 has different resistance readings, which have a positive correlation.
Fig. 10 and 11 are top and bottom views of fig. 3, the support sheet 300 is in the shape of an elongated strip, and the support sheet conductive plate 320 is mounted on the support sheet 300 and is flush with the support sheet 300. The spring pin 350 is mounted in the resistor barrel 340, and the resistor barrel 340 is located at the leftmost end of the support sheet 300.
In one embodiment of the present invention shown in fig. 3, the thickness of the support piece 300 is 1.2mm, the maximum moving distance of the spring pin 350 is 0.75mm, the measurement range of the backlash is 1.25mm-2.0mm, the resistance variation range is 16.6 Ω -256.3 Ω, and the error of the digital multimeter 100 in measuring the resistance is 0.8%, so that the calculation of the backlash by measuring the resistance has a higher accuracy, and if the measurement backlash is 2.0mm, the effective resistance length of the resistance barrel in the measurement loop is 0.8mm, and the measurement error is:
U＝0.8mm×0.8＝0.0064mm
since the thickness of the smallest plug piece of the feeler gauge is 0.02mm, the clearance smaller than 0.02mm cannot be distinguished when the feeler gauge is used for clearance measurement, and the measurement error is 0.02 mm. Therefore, the accuracy of measuring the tooth side clearance by adopting the resistance method is better than that of measuring by using a feeler gauge.
According to the invention, the spring pin is arranged on the sheet with the thickness of 1.2mm in the thickness direction, when the gap is large, the spring pin automatically pops out, when the gap is small, the spring pin automatically retracts, one end of the spring pin is contacted with one tooth side of the sleeve tooth, the other end of the spring pin is arranged in the resistor barrel on the sheet, when the spring pin moves, the elastic sheet at the tail part of the spring pin is contacted with different positions in the cylindrical resistor barrel, and the size of popping or retracting of the spring pin can be judged by measuring the change of the resistor barrel through a digital multimeter. The method has the advantages of short measurement time, measurement result reading block, stable measurement error and capability of minimizing the error through calibration before measurement.
Example 2:
further, in fig. 5, the tail of the cylindrical spring pin 350 is formed with a plurality of grooves 400 uniformly distributed on the circumference, so that the tail elastic sheet 410 of the spring pin tends to expand outward and has certain elasticity, thereby ensuring that the tail elastic sheet 410 of the spring pin always keeps contact with the inner wall of the resistor barrel 340 when the spring pin 350 moves up and down.
Example 3:
a method for measuring the side clearance of a set tooth based on resistance measurement comprises the following steps:
step 1: acquiring a resistance measurement value experiment data table of the digital multimeter 100 corresponding to the situation that the front end of the support sheet 300 is arranged in gaps with different distances through a calibration experiment;
step 2: the front end of the support sheet 300 extends into the tooth side gap 230 of the set tooth to be measured, the bottom surface of the support sheet 300 is contacted with the outer tooth 210 of the set tooth to be measured, and the arc surface of the head part of the spring pin 350 is contacted with the inner tooth 200 of the set tooth to be measured; connecting one end of a character multimeter 100 with the inner teeth 200 of the set teeth to be measured, and connecting the other end with a supporting sheet conductive plate 320;
and step 3: resistance measurements of digital multimeter 100 are read and compared to the experimental data sheet obtained in step 1 to obtain a measurement of the backlash 230 of the set of teeth to be measured.
Example 4:
further, the measurement accuracy of the invention can be further improved by adopting a calibration method, and the method for performing the calibration experiment in the step 1 specifically comprises the following steps: the micrometer is used for adjusting different gap values, the measurement is carried out through the measuring device disclosed by the invention, and the reading of the multimeter is recorded when different gaps exist, so that the calibration is realized.
In fig. 12, one micrometer 800 is provided with a coarse knob 820 and a fine knob 810, and when the coarse knob 820 and the fine knob 810 are rotated, the distance between the movable measuring head 830 and the fixed measuring head 840 changes, and a specific numerical value can be displayed through a digital display window 850, and the micrometer 800 can be calibrated through a measuring rod provided by itself or by using a block gauge.
In fig. 13, the distance between the movable measuring head 830 and the fixed measuring head 840 is adjusted by rotating the coarse knob 820 and the fine knob 810, and the invention is placed between the movable measuring head 830 and the fixed measuring head 840 for gap measurement, so as to obtain a resistance value table displayed by the invention when different gaps exist. Then the invention is adopted to measure the tooth side clearance of the clutch sleeve tooth, and the tooth side clearance can be reversely deduced through the resistance numerical value table.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a set tooth flank clearance measuring device based on resistance measurement which characterized in that: the resistance tester comprises a digital multimeter (100), a support sheet (300), a support sheet insulating plate (330), a resistance barrel (340), a spring pin (350) and a spring (360); the support sheet (300) is in a slender strip shape, and a support sheet conductive plate (320) is embedded in a groove on the outer surface of the lower part of the support sheet (300); the resistance barrel (340) is arranged at the front end of the support sheet (300) and is positioned above the support sheet conductive plate (320); the resistance barrel (340) is in a barrel shape, and the barrel bottom part of the resistance barrel (340) is provided with a through hole; the spring pin (350) is installed in the resistance barrel (340), the head of the spring pin (350) is matched with a through hole at the barrel bottom of the resistance barrel (340), and the tail of the spring pin (350) with the elastic sheet (410) is always in contact with the inner wall of the resistance barrel (340); the support sheet insulating plate (330) is embedded in the support sheet conductive plate (320) and is positioned below the resistance barrel (340); the spring (360) is mounted between the support sheet insulation plate (330) and the spring pin cavity (390); the front end of the support sheet (300) extends into a tooth side gap (230) of the set tooth to be measured, the bottom surface of the support sheet (300) is in contact with an outer tooth (210) of the set tooth to be measured, and the arc surface of the head of the spring pin (350) is in contact with an inner tooth (200) of the set tooth to be measured;
one end of the digital multimeter (100) is connected with the inner teeth (200) of the set teeth to be measured, and the other end of the digital multimeter is connected with the supporting sheet conductive plate (320); when the elastic sheet (410) at the tail part of the spring pin (350) is in contact with different positions of the inner wall of the resistance barrel (340), the effective length of current flowing through the resistance barrel (340) is changed, so that the resistance is changed, and the digital multimeter (100) can accurately display the change of the resistance value; the resistance reading of the digital multimeter (100) has a positive correlation with the tooth flank clearance (230) of the set of teeth to be measured.
2. A set tooth flank clearance measuring device based on resistance measurement as set forth in claim 1, wherein: the support sheet (300) is made of an insulating material; the surface layer of the support chip conducting plate (320) is coated with an insulating material; the surface of the spring pin (350) in contact with the support piece conducting plate (320) and the surface of the spring pin in contact with the through hole in the bottom of the resistance barrel (340) are coated with insulating materials; the contact part of the elastic sheet (410) at the tail part of the spring pin (350) and the inner barrel wall of the resistance barrel (340), and the contact part of the cambered surface at the head part of the spring pin (350) and the inner teeth (200) of the set teeth to be measured are not coated with insulating materials; the contact part of the spring (360) and the support sheet conductive plate (320) is made of non-conductive materials.
3. A set tooth flank clearance measuring device based on resistance measurement as set forth in claim 1, wherein: the tail part of the spring pin (350) is cylindrical, and elastic sheet mounting grooves (400) are uniformly distributed along the circumferential direction of the tail part of the spring pin (350); the elastic pieces (410) are respectively inserted into the elastic piece mounting grooves (400) at the tail parts of the spring pins (350), and the whole body has the outward expansion trend; the elastic sheet (410) has elasticity, and when the spring pin (350) moves up and down, the elastic sheet (410) is always in contact with the inner wall of the resistance barrel (340).
4. The measurement method of the sleeve tooth side clearance measurement device based on the resistance measurement is characterized by comprising the following steps of:
step 1: acquiring a resistance measurement value experiment data table of the digital multimeter (100) corresponding to the situation that the front end of the support sheet (300) is arranged in gaps with different distances through a calibration experiment;
step 2: the front end of a support sheet (300) extends into a tooth side gap (230) of the set tooth to be measured, the bottom surface of the support sheet (300) is in contact with an outer tooth (210) of the set tooth to be measured, and the arc surface of the head of a spring pin (350) is in contact with an inner tooth (200) of the set tooth to be measured; one end of a character multimeter (100) is connected with the inner teeth (200) of the set teeth to be measured, and the other end of the character multimeter is connected with the supporting sheet conductive plate (320);
and step 3: and (3) reading the resistance measurement value of the digital multimeter (100), and comparing the resistance measurement value with the experimental data table obtained in the step 1 to obtain a tooth side clearance (230) measurement value of the set tooth to be measured.
5. A method of measuring a set tooth flank clearance based on resistance measurement as claimed in claim 4, wherein: the method for performing the calibration experiment in the step 1 specifically comprises the following steps:
step 1.1: the front end of the support piece (300) is arranged between a movable measuring head (830) and a fixed measuring head (840) of the digital display micrometer (800), and the bottom surface of the support piece (300) and the arc surface of the head of the spring pin (350) are respectively contacted with the movable measuring head (830) and the fixed measuring head (840) of the digital display micrometer (800); one end of a digital multimeter (100) is connected with a fixed measuring head (840) of the digital micrometer (800), and the other end is connected with a support piece conducting plate (320);
step 1.2: adjusting the distance between a movable measuring head (830) and a fixed measuring head (840) of the digital micrometer (800) to obtain the resistance measurement value of the digital multimeter (100), wherein the distance value between the movable measuring head (830) and the fixed measuring head (840) is directly obtained by a digital display window (850) of the digital micrometer (800);
step 1.3: and (3) repeatedly executing the step 1.2, and acquiring resistance measurement value experiment data tables corresponding to different distance values between the movable measuring head (830) and the fixed measuring head (840).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116990562A (en) * | 2023-09-26 | 2023-11-03 | 国网江苏省电力有限公司泰州供电分公司 | Protection switch device for electric power measurement universal meter |
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| CN114252004B (en) | 2023-11-17 |
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