CN113188575A - Insulator creepage distance measuring instrument - Google Patents
Insulator creepage distance measuring instrument Download PDFInfo
- Publication number
- CN113188575A CN113188575A CN202110604398.XA CN202110604398A CN113188575A CN 113188575 A CN113188575 A CN 113188575A CN 202110604398 A CN202110604398 A CN 202110604398A CN 113188575 A CN113188575 A CN 113188575A
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- creepage distance
- measuring
- measuring instrument
- distance measuring
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- 239000012212 insulator Substances 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000005259 measurement Methods 0.000 abstract description 21
- 238000013461 design Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 15
- 230000003373 anti-fouling effect Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention provides an insulator creepage distance measuring instrument, which comprises: the device comprises a shell, a measuring unit, a control unit and a display unit; the control unit is mounted inside the shell; the display unit is electrically connected with the control unit; the control unit comprises a code disc and a detection control part; the measuring unit is connected with the coded disc; the coded disc is in photoelectric connection with the detection control part. Through the design of casing, measuring element, the control unit and display element for the detector is small and exquisite light more, carries easily. Meanwhile, the photoelectric connection design of the code disc and the detection control part is adopted, so that the measurement accuracy and simplicity are improved, and the measurement of the creepage distance is facilitated.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an insulator creepage distance measuring instrument.
Background
The pollution flashover accident of the power transmission and transformation equipment is one of the main accidents for the key prevention of the power system, because the accident seriously threatens the operation safety of the power grid. With the aggravation of environmental pollution, the antifouling grade of the power transformation equipment can not meet the requirement of field antifouling. In the operation and maintenance process of the power system, the external insulation creepage distance of the field equipment needs to be accurately measured and mastered so as to facilitate the antifouling treatment work of the field equipment.
At present, three methods for measuring the creepage distance of the insulator are mainly used, namely a traditional measuring method, a laser measuring method and a transmission measuring method. The traditional measuring method generally refers to traditional insulator creepage distance measuring methods such as a leather tape method, a thin line method and the like, and the principle is that a soft inelastic string or tape is used for directly or indirectly measuring creepage distance paths on the surface of an insulator, but the method has the defects of large measuring error, low precision, different measured data and low measuring efficiency;
the laser measurement method generally refers to the method of adopting a mechatronic device to control a point-emitting laser range finder to scan along the axial direction of an insulator so as to obtain an insulator model, an insulator contour line and a creepage distance parameter, but the method has the problems of difficult measurement of the insulator with a complex shape due to structural shielding, large volume and complex structure of the instrument, and thus the instrument is inconvenient to carry and complex to operate;
the principle of the method is that a driving wheel is connected with a driven wheel through a transmission belt, the driving wheel rolls along the surface of an insulator and drives the driven wheel through the transmission belt, and a measuring unit detects the rotation angle of the driven wheel so as to calculate the creepage distance.
Disclosure of Invention
In view of the above problems, the invention provides an insulator creepage distance measuring instrument, which is used for solving the problems of large measuring error, low measuring efficiency and inconvenience in carrying.
In order to solve the above problems, an embodiment of the present invention discloses an insulator creepage distance measuring instrument, including: the device comprises a shell, a measuring unit, a control unit and a display unit;
the control unit is mounted inside the shell; the display unit is electrically connected with the control unit;
the control unit comprises a code disc and a detection control part; the measuring unit is connected with the coded disc; the coded disc is in photoelectric connection with the detection control part.
Further, the measuring unit comprises a measuring connecting rod, a connecting piece and a transmission shaft sleeve;
the measuring connecting rod is rotatably connected to the inside of the transmission shaft sleeve; the connecting piece is arranged at the bottom of the measuring connecting rod.
Further, the cross section of the measuring head of the measuring connecting rod is circular.
Further, mounting hole sites are arranged on the coded disc; the mounting hole sites are connected with the connecting pieces.
Further, the detection control part comprises an encoder component, a main board and a power supply component;
the encoder assembly and the main board are both electrically connected with the power supply assembly.
Further, the encoder assembly comprises an encoder plate and an encoder structure;
the encoder plate is connected with the encoder structure.
Furthermore, an on-off key is arranged on the mainboard; the main board is electrically connected with the display unit;
the switch key and the display unit penetrate through the shell and are installed outside the shell.
Further, the power supply assembly comprises a battery and a battery cover;
the battery cover is arranged at the top of the battery; the battery cover is arranged between the battery and the mainboard.
Further, the control unit further comprises a brake assembly; the brake assembly comprises a permanent magnet and an electromagnet;
the permanent magnet is connected with the measuring unit; the electromagnet is electrically connected with the detection control part.
Further, the inside of the shell also comprises a transmission shaft support;
the measuring unit penetrates through the shell and is connected with the transmission shaft support; the transmission shaft supporting piece is provided with a fixed groove strip matched with the measuring unit.
Compared with the prior art, the invention has the following beneficial effects: through the design of casing, measuring element, the control unit and display element for the detector is small and exquisite light more, carries easily. Meanwhile, the photoelectric connection design of the code disc and the detection control part is adopted, so that the measurement accuracy and simplicity are improved, and the measurement of the creepage distance is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an insulator creepage distance measuring instrument according to the present invention.
The reference numbers in the drawings of the specification are as follows:
a housing 1; a measuring link 21; a connecting member 22; a driving sleeve 23; a code wheel 31; a main board 33; a power supply component; an encoder board 321; an encoder structure 322; a battery 341; a battery cover 342; a display unit 4; a brake assembly 5; a permanent magnet 51; an electromagnet 52; a propeller shaft support 6.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein, the percentages not specifically stated in the present invention are all weight percentages/mass percentages.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, a schematic structural diagram of an insulator creepage distance measuring instrument according to the present invention is shown, which may specifically include: a housing 1, a measuring unit, a control unit and a display unit 4;
the control unit is mounted inside the housing 1; the display unit 4 is electrically connected with the control unit;
the control unit comprises a code wheel 31 and a detection control part; the measuring unit is connected with the code disc 31; the code wheel 31 is in optical-electrical connection with the detection control part. More specifically, the housing 1 is mainly formed by screwing an upper housing 1 and a lower housing 1, and the coupled housings 1 are formed with coupling openings through which the measurement units pass. Wherein, a plurality of fixed thread columns are arranged in the lower shell 1 and are used for being in adaptive threaded connection with each unit in the shell 1; go up casing 1 and be equipped with a plurality of holes, display element 4 accessible hole exposes in casing 1 outside, makes things convenient for operating personnel to look over measured data, and various manual operation buttons of plus being connected with the control unit electricity also can expose in casing 1 outside through the hole, make things convenient for operating personnel to operate.
The code wheel 31 is a digital encoder for measuring angular displacement, and is a sensor for converting mechanical geometric displacement on an output shaft into pulse digital quantity, the measuring unit is fixedly connected with the code wheel 31 in a clamping or threaded connection manner, and the code wheel 31 is in an optical-electrical connection relationship with the detection control part. After the code wheel 31 rotates synchronously with the measuring unit, a plurality of pulse signals are output through a device composed of electronic elements such as light emitting diodes, and the pulse signals are received and detected by the detection control part and are decoded, so that the measuring distance measured by the measuring unit is obtained.
In the embodiment of the application, the design of the shell 1, the measuring unit, the control unit and the display unit 4 is disclosed, so that the detector is smaller and lighter and is easy to carry. Meanwhile, the coded disc 31 and the detection control part are in photoelectric connection design, so that the accuracy and the simplicity of measurement are improved, and the measurement of the creepage distance is facilitated.
Next, a further description will be given of an insulator creepage distance measuring instrument in the present exemplary embodiment.
As an example, the measuring unit comprises a measuring link 21, a connecting piece 22 and a driving sleeve 23;
the measuring connecting rod 21 is rotatably connected to the inside of the driving shaft sleeve 23; the connecting piece 22 is arranged at the bottom of the measuring link. The measuring head of the measuring link 21 is circular in cross section. More specifically, since the measuring head is rolled at the measuring position when the creepage distance is measured, the cross section of the measuring head is circular in order to ensure the smoothness and accuracy of rolling. In order to protect the service life of the measuring connecting rod 21, the measuring connecting rod 21 is arranged in the transmission sleeve; meanwhile, in order to prevent measurement errors caused by friction between the measurement connecting rod 21 and the driving shaft sleeve 23 in the measurement process, a cylindrical cavity matched with the measurement connecting rod 21 is formed in the driving shaft sleeve 23, and the influence of excessive friction on the rotation of the measurement connecting rod 21 is reduced.
As an example, the code wheel 31 is provided with a mounting hole site; the mounting hole locations are connected to the connectors 22. More specifically, since the connecting member 22 is disposed at the bottom of the measuring link 21, and the connecting member 22 is fixedly connected to the measuring link 21, when the measuring link 21 rotates, the connecting member 22 also rotates. In order to facilitate connection between code wheel 31 and connecting piece 22, a mounting hole is arranged on code wheel 31, and connecting piece 22 is clamped or in threaded connection with code wheel 31 through the mounting hole. It should be noted that the link 22 and the code wheel 31 are fixedly connected, and since the link 22 and the measuring link 21 are also fixedly connected, when the measuring link 21 rotates, the code wheel 31 also rotates.
As an example, the detection control section includes an encoder component, a main board 33, and a power supply component;
both the encoder assembly and the motherboard 33 are electrically connected to the power assembly. More specifically, the encoder assembly is mainly used for receiving and detecting signals sent from the code wheel 31, transmitting the received and detected signals to the main board 33, calculating and storing the signals by the main board 33, and finally transmitting the calculated data to the display unit 4 so as to display the measured data. In other embodiments, the encoder component is connected to the motherboard 33, and the power supply component is also directly connected to the motherboard, that is, the motherboard 33 is provided with a control signal interface and an external power interface of an external component, the encoder component is collected to the motherboard 33 through the control signal interface, the power supply component is connected to the motherboard 33 through the external power interface, and the power supply component directly supplies power to the motherboard 33 and indirectly supplies power to the encoder component through the motherboard 33.
As an example, the encoder assembly includes an encoder board 321 and an encoder structure 322;
the encoder board 321 is connected to the encoder structure 322. More specifically, the encoder board 321 is provided mainly for enhancing the fastening of the entire encoder assembly and fixing the position of the entire encoder assembly within the housing 1.
As an example, the main board 33 is provided with an on-off key; the main board is electrically connected with the display unit 4;
the switch key and the display unit 4 are installed outside the casing 1 through the casing 1. More specifically, the display unit 4 is an OLED display screen, and the on-off key is used to turn on and off the meter.
As an example, the power supply components include a battery 341 and a battery cover 342;
the battery cover 342 is mounted on the top of the battery 341; the battery cover 342 is disposed between the battery 341 and the main board 33. More specifically, the battery 341 in the power supply module is a lithium battery 341; since the main board 33 is mounted on the top of the battery 341, a battery cover 342 is mounted on the top of the battery 341 in order to protect the battery 341; meanwhile, the battery cover 342 also has a position fixing function, and the main board 33 is tightly fixed on the top of the battery 341 by screwing with the battery cover 342.
As an example, the control unit further comprises a brake assembly; the brake assembly comprises a permanent magnet and an electromagnet;
the permanent magnet is connected with the measuring unit; the electromagnet is electrically connected with the detection control part.
More specifically, the permanent magnet 51 is inserted inside the connecting member 22; the electromagnet 52 is electrically connected to the main board 33. The permanent magnet 51 and the electromagnet 52 are adapted to each other and mainly function to brake the rotation of the measuring link 21. In order to prevent the problem that the measurement data cannot be detected when the rolling speed of the measurement connecting rod 21 is too high, when the rolling speed of the measurement connecting rod 21 reaches a certain threshold value, the permanent magnet 51 and the electromagnet 52 brake the measurement connecting rod 21 through magnetic force, thereby ensuring the measurement accuracy. It should be noted that, because the electromagnet 52 is electrically connected to the main board 33, when the main board 33 detects that the rotation speed of the measurement link 21 exceeds a certain threshold, the electromagnet 52 is controlled to be energized, and at this time, the permanent magnet 51 and the electromagnet 52 inserted inside the connecting member 22 generate a resistance, thereby preventing or reducing the rotation speed of the measurement link 21.
In other embodiments, the interface of the electromagnet 52 is provided on the main board 33, the electromagnet 52 can be directly connected to the main board 33, the power supply assembly indirectly supplies power to the electromagnet 52 through the main board 33, the encoder assembly is also mounted on the main board 33, the encoder structure 322 is provided with a slot where the electromagnet 52 is disposed, and the electromagnet 52 is disposed.
As an example, the inside of the housing 1 further includes a propeller shaft support 6;
the measuring unit is connected to the drive shaft support 6 through the housing 1; the transmission shaft support 6 is provided with a fixed groove strip adapted to the measuring unit. More specifically, the outdrive 23 passes through the attachment opening of the housing 1 and is fixedly attached to the outdrive support 6 by means of a threaded connection, which increases the robustness of the outdrive 23 and thus ensures the measurement stability of the test linkage.
The operation process of the application is as follows: in the test range, the machine body is held by hand, a measuring head of the measuring connecting rod 21 is tightly attached to the insulator to be tested, and then the machine body is slid, so that the measuring head stably rolls on the surface of the insulator without sliding; at the moment, the test head rotates around the axis, the measuring connecting rod 21 rotates with the measuring head at the same angular speed, and the measuring connecting rod 21 rotates to drive the coded disc 31 to rotate; at this time, the encoder assembly detects the rotation of the code wheel 31, receives a signal transmitted from the code wheel 31, transmits the signal to the main board 33, the main board 33 calculates and stores the signal, and finally, the display unit 4 displays the measured data.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An insulator creepage distance measuring instrument, comprising: the device comprises a shell, a measuring unit, a control unit and a display unit;
the control unit is mounted inside the shell; the display unit is electrically connected with the control unit;
the control unit comprises a code disc and a detection control part; the measuring unit is connected with the coded disc; the coded disc is in photoelectric connection with the detection control part.
2. The insulator creepage distance measuring instrument according to claim 1, wherein the measuring unit includes a measuring link, a connecting member, and a driving bushing;
the measuring connecting rod is rotatably connected to the inside of the transmission shaft sleeve; the connecting piece is arranged at the bottom of the measuring connecting rod.
3. The insulator creepage distance measuring instrument of claim 2, wherein the measuring head of the measuring link has a circular cross section.
4. The insulator creepage distance measuring instrument according to claim 2, wherein the coded disc is provided with a mounting hole site; the mounting hole sites are connected with the connecting pieces.
5. The insulator creepage distance measuring instrument according to claim 1, wherein the detection control section includes an encoder component, a main board, and a power supply component;
the encoder assembly and the main board are both electrically connected with the power supply assembly.
6. The insulator creepage distance measuring instrument of claim 5, wherein the encoder assembly comprises an encoder plate and an encoder structure;
the encoder plate is connected with the encoder structure.
7. The insulator creepage distance measuring instrument according to claim 5, wherein an on-off key is provided on the main board; the main board is electrically connected with the display unit;
the switch key and the display unit penetrate through the shell and are installed outside the shell.
8. The insulator creepage distance measuring instrument of claim 5, wherein the power supply assembly comprises a battery and a battery cover;
the battery cover is arranged at the top of the battery; the battery cover is arranged between the battery and the mainboard.
9. The insulator creepage distance measuring instrument of claim 1, wherein the control unit further comprises a brake assembly; the brake assembly comprises a permanent magnet and an electromagnet;
the permanent magnet is connected with the measuring unit; the electromagnet is electrically connected with the detection control part.
10. The insulator creepage distance measuring instrument of any of claims 1 to 9, wherein the housing further comprises a drive shaft support inside;
the measuring unit penetrates through the shell and is connected with the transmission shaft support; the transmission shaft supporting piece is provided with a fixed groove strip matched with the measuring unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110604398.XA CN113188575A (en) | 2021-05-31 | 2021-05-31 | Insulator creepage distance measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110604398.XA CN113188575A (en) | 2021-05-31 | 2021-05-31 | Insulator creepage distance measuring instrument |
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| Publication Number | Publication Date |
|---|---|
| CN113188575A true CN113188575A (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110604398.XA Pending CN113188575A (en) | 2021-05-31 | 2021-05-31 | Insulator creepage distance measuring instrument |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206177245U (en) * | 2016-09-29 | 2017-05-17 | 深圳市迈测科技股份有限公司 | Electrooptical distance measuring device |
| JP2017106813A (en) * | 2015-12-10 | 2017-06-15 | 株式会社トプコン | Measuring apparatus |
| CN206613083U (en) * | 2016-12-03 | 2017-11-07 | 广东奥玛健身器材有限公司 | Magnet controlled treadmill |
| TWM558097U (en) * | 2017-08-17 | 2018-04-11 | Tung Keng Enterprise Co Ltd | Exercise equipment |
| CN207342100U (en) * | 2017-09-01 | 2018-05-11 | 东庚企业股份有限公司 | Sports equipment |
| CN208505333U (en) * | 2018-07-25 | 2019-02-15 | 江苏春秋重型机械有限公司 | A kind of motor encoder of measurable upper roller travel distance |
| CN110608643A (en) * | 2019-10-10 | 2019-12-24 | 深圳市瑞大科技有限公司 | Grating digital display distance measuring instrument |
| CN214666903U (en) * | 2021-05-31 | 2021-11-09 | 广州广华智电科技有限公司 | Insulator creepage distance measuring instrument |
-
2021
- 2021-05-31 CN CN202110604398.XA patent/CN113188575A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017106813A (en) * | 2015-12-10 | 2017-06-15 | 株式会社トプコン | Measuring apparatus |
| CN206177245U (en) * | 2016-09-29 | 2017-05-17 | 深圳市迈测科技股份有限公司 | Electrooptical distance measuring device |
| CN206613083U (en) * | 2016-12-03 | 2017-11-07 | 广东奥玛健身器材有限公司 | Magnet controlled treadmill |
| TWM558097U (en) * | 2017-08-17 | 2018-04-11 | Tung Keng Enterprise Co Ltd | Exercise equipment |
| CN207342100U (en) * | 2017-09-01 | 2018-05-11 | 东庚企业股份有限公司 | Sports equipment |
| CN208505333U (en) * | 2018-07-25 | 2019-02-15 | 江苏春秋重型机械有限公司 | A kind of motor encoder of measurable upper roller travel distance |
| CN110608643A (en) * | 2019-10-10 | 2019-12-24 | 深圳市瑞大科技有限公司 | Grating digital display distance measuring instrument |
| CN214666903U (en) * | 2021-05-31 | 2021-11-09 | 广州广华智电科技有限公司 | Insulator creepage distance measuring instrument |
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