CN115753695A - Shielding carpet detection method based on light and insulation resistance - Google Patents
Shielding carpet detection method based on light and insulation resistance Download PDFInfo
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- CN115753695A CN115753695A CN202211504186.5A CN202211504186A CN115753695A CN 115753695 A CN115753695 A CN 115753695A CN 202211504186 A CN202211504186 A CN 202211504186A CN 115753695 A CN115753695 A CN 115753695A
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Abstract
A shielding blanket detection method based on light and insulation resistance is characterized in that a shielding blanket is laid on a machine body, a first detection assembly and a second detection assembly are used for detection, the second detection assembly is used for detecting the insulation resistance of each detection point, if the resistance value of each detection point is larger than or equal to 1000M omega, the shielding blanket is qualified, if the resistance value of each detection point is smaller than 700M omega, the shielding blanket is unqualified, if the resistance value of any detection point is larger than or equal to 700M omega and smaller than 1000M omega, a first detection assembly is used for detection, an optical generator is started, if the optical receiver receives light emitted by the optical generator, the shielding blanket is unqualified, otherwise, the shielding blanket is qualified.
Description
Technical Field
The invention relates to the technical field of live-wire work tools, in particular to a shielding blanket detection method based on light and insulation resistance.
Background
Live working refers to a working method for overhauling and testing high-voltage electrical equipment without power cut. Tools and instruments used in the live working process, such as shielding blankets, put high requirements on safety, particularly insulation. The tool must be tested before each operation. In the related prior art, two copper plates are used, the distance between the two copper plates is kept at 20mm, the two copper plates are placed on the upper surface of the shielding blanket to be detected, a certain voltage is applied between the two copper plates by using a megger, then the resistance between the two copper plates is measured, and the insulativity of the shielding blanket is further judged. Generally, if the insulation resistance is 700M Ω or more, the insulation property of the shielding blanket is determined to satisfy the requirement, and if the insulation resistance is less than 700M Ω, the insulation property of the shielding blanket is determined to not satisfy the requirement. In the following, holes, grommets, etc. in the masking blanket that allow light to pass through are referred to as through holes, and holes, grommets, etc. in the masking blanket that do not allow light to pass through are referred to as blind holes. The judgment reference of the insulation resistance of 700M omega is not sensitive to the through hole, in some cases, when the measured insulation resistance of the shielding blanket reaches 700M omega, the through hole still exists at the local part of the shielding blanket, so that greater potential safety hazards exist, the judgment reference of the insulation resistance is improved to 800M omega, 900M omega, 1000M omega or even 1100M omega, and the probability of misjudgment is too high.
The invention discloses a band steel hole identification and marking device and method based on laser, which comprises a hole on-line detection device and a marking device, wherein the marking device is arranged at one side edge of a band steel walking route, the hole on-line detection device is arranged adjacent to the marking device, a laser emission component of the hole on-line detection device is arranged above or below the band steel, a laser receiving component of the hole on-line detection device is arranged at the other side of the band steel and at a position corresponding to the laser emission component, and the hole on-line detection device sends a hole position detection signal to the marking device. When the shielding blanket is detected by adopting the on-line hole detection device, the on-line hole detection device is sensitive to the through holes and insensitive to the blind holes, so that the probability of missing detection is high.
In the prior art, the detection technology for judging the insulativity of the shielding blanket based on the insulation resistance and the light linear propagation principle has the condition of misjudgment or missing detection.
Disclosure of Invention
In view of the above, it is necessary to provide a method for detecting a shielding carpet based on light and insulation resistance.
A shielding blanket detection method based on light and insulation resistance is characterized in that a shielding blanket is laid on a machine body and is detected by adopting a first detection assembly and a second detection assembly, the machine body comprises a frame body, a bottom plate and a top plate, the top plate and the bottom plate are sequentially arranged on the frame body from top to bottom, the top plate and the bottom plate are arranged in parallel relatively, shading cloth is arranged on the peripheries of the bottom plate and the top plate, the bottom plate, the top plate and the shading cloth jointly form a lightless closed space, a first accommodating groove is formed in the upper surface of the bottom plate, the first detection assembly comprises a light generator, a light receiver and a convex lens group, the light receiver is arranged in the first accommodating groove, the light generator is arranged on the lower surface of the top plate and is located right above the light receiver, the convex lens group is arranged in the first accommodating groove, and the light emitted by the light generator is received by the light receiver after passing through the convex lens group; the second detection assembly comprises a handheld part and a resistance tester, the handheld part comprises an insulating tube, a first copper plate, a second copper plate, a first lead and a second lead, the first end of the first copper plate is connected with the insulating tube, the second end of the first copper plate is a free end, the first end of the second copper plate is connected with the insulating tube, the second end of the second copper plate is a free end, the resistance tester comprises a first joint and a second joint, the first end of the first lead is connected with the second end of the first copper plate, the second end of the first lead is connected with the first joint of the resistance tester, the first end of the second lead is connected with the second end of the second copper plate, and the second end of the second lead is connected with the second joint of the resistance tester; the detection method comprises the following steps:
marking a plurality of detection points on the upper surface of the shielding blanket, and detecting the insulation resistance of each detection point by using a second detection assembly;
the detection process of the second detection assembly is as follows:
the shading cloth is folded, the shading blanket is laid on the bottom plate of the first detection assembly, the resistance tester is started, the handheld part is moved to a detection point position, the lower surfaces of the first copper plate and the second copper plate are in contact with the upper surface of the shading blanket, the detection point position is located in the centers of the first copper plate and the second copper plate, and the resistance value measured by the resistance tester is read;
if the resistance value of each detection point is greater than or equal to 1000 MOmega, the shielding blanket is qualified;
if the resistance value of each detection point is smaller than 700M omega, the shielding blanket is unqualified;
if the resistance value of any detection point is larger than or equal to 700M omega and smaller than 1000M omega, adopting a first detection assembly for detection;
the detection process of the first detection assembly is as follows:
moving the shielding blanket to enable the detection point with the resistance value of more than or equal to 700M omega and less than 1000M omega to be positioned right below the light generator and right above the light receiver;
putting down the shading cloth to enable the shading blanket to be positioned in a sealed space without light formed by the bottom plate, the top plate and the shading cloth;
and starting the light generator, wherein if the light receiver receives the light emitted by the light generator, the shielding blanket is unqualified, otherwise, the shielding blanket is qualified.
Preferably, the resistance tester is used for measuring the resistance value between the first copper plate and the second copper plate.
Preferably, the resistance tester is a megger.
Preferably, the megger comprises an L end and an E end.
Preferably, the megger further comprises a display screen.
Preferably, the distance between the first and second copper plates is 20mm.
Preferably, the upper surface of the first copper plate and the upper surface of the second copper plate are in one plane.
Preferably, the first copper plate or the second copper plate is disposed near a bottom wall of the insulating tube.
Preferably, first copper and second copper structure are the same, first copper is including straight board, first arc, second arc, straight board, first arc, second arc are end to end in proper order, the axis direction of second arc is parallel with the upper surface of first copper, the axis direction of second arc is perpendicular with the upper surface of first copper.
Preferably, the first lead and the second lead are arranged in the insulating tube.
Compared with the prior art, the invention mainly uses the second detection component, prevents missed detection by improving the detection reference of the second detection component, eliminates the defects of high false judgment rate and high missed detection rate due to single use of the first detection component and effectively improves the detection efficiency of the shielding carpet by using the second detection component in an auxiliary verification mode by using the first detection component on the premise that the first detection component and the second detection component are coordinated with each other.
Drawings
Fig. 1 is a top view of the first detection assembly.
Fig. 2 isbase:Sub>A sectional view taken alongbase:Sub>A-base:Sub>A in fig. 1.
Fig. 3 is a sectional view taken along the direction C-C in fig. 1.
Fig. 4 is a partial enlarged view of the position of the top plate in fig. 2.
Fig. 5 is an enlarged partial view of the location of the baseplate in fig. 2.
Fig. 6 is an enlarged partial view of the location of the baseplate in fig. 3.
FIG. 7 is a top view of the second sensing assembly.
Fig. 8 is the second test assembly, not shown with the resistance tester.
Fig. 9 is a modified structure of the resistance tester.
In the figure: the detection device comprises a body 10, a frame body 11, a top plate 12, a bottom plate 13, a first detection assembly 20, a light generator 21, a unit parallel light source 211, a focusing reflector 2111, an LED lamp 2112, a light receiver 22, a photoresistor 221, a convex lens group 23, a first convex lens 231, a second convex lens 232, a second detection assembly 30, a handheld portion 31, an insulating tube 311, a first copper plate 312, a straight plate 3121, a first arc plate 3122, a second arc plate 3123, a second copper plate 313, a first lead 314, a second lead 315, a resistance tester 32, a first joint 321, a second joint 322, a detection resistor 323, a dry battery 324, an ammeter 325, a third lead 326 and a shielding blanket 40.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Referring to fig. 1 to 9, an embodiment of the present invention provides a method for detecting a shielding blanket based on light and an insulation resistor, in which a shielding blanket 40 is laid on a machine body, and a first detection assembly 20 and a second detection assembly 30 are used for detecting, where the machine body 10 includes a frame body 11, a bottom plate 13 and a top plate 12, the top plate 12 and the bottom plate 13 are sequentially disposed on the frame body 11 from top to bottom, the top plate 12 and the bottom plate 13 are disposed in parallel, light shielding cloth is disposed around the bottom plate 13 and the top plate 12, the bottom plate 13, the top plate 12 and the light shielding cloth together form a lightless closed space, a first accommodating groove is disposed on an upper surface of the bottom plate 13, the first detection assembly 20 includes a light generator 21, a light receiver 22 and a convex lens group 23, the light receiver 22 is disposed in the first accommodating groove, the light generator 21 is disposed on a lower surface of the top plate 12, the light generator 21 is disposed directly above the light receiver 22, the convex lens group 23 is further disposed in the first accommodating groove, and light emitted by the light receiver 22 is focused by the convex lens group 23; the second detection assembly 30 comprises a handheld part 31 and a resistance tester 32, wherein the handheld part 31 comprises an insulating tube 311, a first copper plate 312, a second copper plate 313, a first lead 314 and a second lead 315, the first end of the first copper plate 312 is connected with the insulating tube 311, the second end of the first copper plate 312 is a free end, the first end of the second copper plate 313 is connected with the insulating tube 311, the second end of the second copper plate 313 is a free end, the resistance tester 32 comprises a first joint 321 and a second joint 322, the first end of the first lead 314 is connected with the second end of the first copper plate 312, the second end of the first lead 314 is connected with the first joint 321 of the resistance tester 32, the first end of the second lead 315 is connected with the second end of the second copper plate 313, and the second end of the second lead 315 is connected with the second joint 322 of the resistance tester 32; the detection method comprises the following steps:
marking a plurality of detection points on the upper surface of the shielding blanket 40, and detecting the insulation resistance of each detection point by using the second detection component 30;
the second detecting assembly 30 detects as follows:
the shading cloth is folded, the shading blanket 40 is laid on the bottom plate 13 of the first detection component 20, the resistance tester 32 is started, the handheld part 31 is moved to a detection point, the lower surfaces of the first copper plate 312 and the second copper plate 313 are in contact with the upper surface of the shading blanket 40, the detection point is positioned in the center of the first copper plate 312 and the second copper plate 313, and the resistance value measured by the resistance tester 32 is read;
if the resistance value of each detection point is greater than or equal to 1000 MOmega, the shielding blanket 40 is qualified;
if the resistance value of each detection point is less than 700M omega, the shielding blanket 40 is unqualified;
if the resistance value of any detection point is greater than or equal to 700M omega and less than 1000M omega, the first detection assembly 20 is adopted for detection;
the first detecting component 20 detects as follows:
moving the shielding blanket 40 so that the detection point with the resistance value of 700M Ω to 1000M Ω is located right below the light generator 21 and right above the light receiver 22;
putting down the shading cloth to enable the shading blanket 40 to be positioned in a lightless closed space formed by the bottom plate 13, the top plate 12 and the shading cloth;
and (3) starting the light generator 21, and if the light receiver 22 receives the light emitted by the light generator 21, the shielding blanket 40 is unqualified, otherwise, the shielding blanket 40 is qualified.
The shading cloth is lifted, so that the shading blanket 40 can conveniently enter and exit the closed space. The light generated by the light generator 21 may also be laser light. The top surface of the light receiver 22 is lower than the upper surface of the base plate 13. The detection points may be random or designated, for example, the center point of the masking blanket 40 is used as an origin, and the center points of the corresponding four quadrants are designated as 4 detection points. The shielding blanket 40 passes through between the light generator 21 and the light receiver 22, if the shielding blanket 40 has a through hole, the light energy emitted by the light generator 21 is received by the light receiver 22, and an electric signal is sent to the singlechip, and the singlechip controls the alarm to give an alarm.
Compared with the prior art, the invention mainly uses the second detection component 30, prevents the missed detection by improving the detection reference of the second detection component 30, and eliminates the defect of high false judgment rate caused by singly using the first detection component 20 and the defect of high missed detection rate caused by singly using the second detection component 30 under the premise that the first detection component 20 and the second detection component 30 are mutually coordinated in a verification mode by using the first detection component 20 as an auxiliary, thereby effectively improving the detection efficiency of the shielding blanket 40.
Referring to fig. 7 to 9, further, the resistance tester 32 is used to measure the resistance value between the first copper plate 312 and the second copper plate 313.
The resistance tester 32 is a megohmmeter, also known as a megohmmeter, commonly used in the art. The resistance tester 32 designed by the present application can also be used, and referring to fig. 3, the resistance tester 32 includes a detection resistor 323, a dry battery 324, an ammeter 325, a first connector 321, a second connector 322, and a third wire 326, wherein the first connector 321 and the second connector 322 are connected by the third wire 326, and the detection resistor 323, the dry battery 324, and the ammeter 325 are connected in series with the third wire 326. When the detection resistor is used, the first connector 321 is connected with the first plug, the second connector 322 is connected with the second plug, the resistance value of the detection resistor 323 is constant, and the resistance value between the first copper plate 312 and the second copper plate 313 is indirectly measured through the current measured by the ammeter 325. The detection resistor 323 is preferably a sliding resistor to adjust the predetermined resistance value according to the accuracy requirement.
Referring to fig. 7-9, further, the resistance tester 32 is a megger.
Referring to fig. 7 to 9, further, the rocking meter includes an L end and an E end. The first plug is connected with the L end, and the second plug is connected with the E end. The resistance value between the first copper plate 312 and the second copper plate 313 is measured by a megger.
The first connector 321 of the resistance tester 32 is the L-terminal of the megger, and the second connector 322 of the resistance tester 32 is the E-terminal of the megger. A first U-shaped plug is installed at the second end of the first wire 314, and a first U-shaped plug is installed at the second end of the first wire 314.
Referring to fig. 7 to 9, further, the megger also includes a display screen. The display screen can display the resistance value of the insulation resistor to be tested.
Referring to fig. 7 to 9, further, the distance between the first and second copper plates 312 and 313 is 20mm.
Referring to fig. 7 to 9, further, the upper surface of the first copper plate 312 is in the same plane as the upper surface of the second copper plate 313.
Referring to fig. 7 to 9, further, the first copper plate 312 or the second copper plate 313 is disposed near the bottom wall of the insulating tube 311.
Referring to fig. 7 to 9, further, the first copper plate 312 and the second copper plate 313 have the same structure, the first copper plate 312 includes a straight plate 3121, a first arc plate 3122, and a second arc plate 3123, the straight plate 3121, the first arc plate 3122, and the second arc plate 3123 are sequentially connected end to end, an axial direction of the second arc plate 3123 is parallel to an upper surface of the first copper plate 312, and an axial direction of the second arc plate 3123 is perpendicular to the upper surface of the first copper plate 312.
The specific size of the straight plate 3121 is 60mm × 40mm × 10mm, the specific size of the first curved plate 3122 and the second curved plate 3123 is 100mm × 50mm × 20mm, the straight plate 3121 is connected with the first curved plate 3122 by bolts, and the first curved plate 3122 and the second curved plate 3123 are integrally formed. The specific dimensions of the insulating tube 311 are Φ 30 × 500mm.
In this embodiment, by providing the first arc-shaped plate 3122, during measurement, the first arc-shaped plate 3122 is in contact with the insulating shielding blanket 40, and a contact surface between the first arc-shaped plate 3122 and the insulating shielding blanket 40 is smooth, so as to avoid scratching the insulating shielding blanket 40.
Referring to fig. 7 to 9, further, the first and second wires 314 and 315 are disposed in the insulating tube 311.
Referring to fig. 1 to 7, further, the light receiver 22 includes a plurality of photo-resistors 221, the photo-resistors 221 are arranged in a row, the convex lens group 23 includes a plurality of first convex lenses 231, and a first convex lens 231 is disposed above each photo-resistor 221.
Referring to fig. 1 to 7, further, the convex lens group 23 includes a plurality of second convex lenses 232, the second convex lenses 232 are disposed above the first convex lenses 231, and the second convex lenses 232 and the first convex lenses 231 are disposed in a staggered manner.
Referring to fig. 1 to 7, further, the light generator 21 is a bar-shaped parallel light source, the light generator 21 includes a plurality of unit parallel light sources 211, the plurality of unit parallel light sources 211 are arranged in a row, and the unit parallel light sources 211 correspond to the photo resistors 221 one by one.
Referring to fig. 1 to 7, further, the unit parallel light source 211 includes a focusing mirror 2111, and an LED lamp 2112, the focusing mirror 2111 is disposed toward the corresponding photo resistor 221, and the LED lamp 2112 is installed in the focusing mirror 2111 to reflect a scattered light beam emitted from the LED lamp 2112 into a straight light beam by the focusing mirror 2111.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The modules or units in the device of the embodiment of the invention can be combined, divided and deleted according to actual needs.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A light and insulation resistance based shielding blanket detection method is characterized in that a shielding blanket is laid on a machine body and is detected by a first detection assembly and a second detection assembly, and the method comprises the following steps: the machine body comprises a frame body, a bottom plate and a top plate, the top plate and the bottom plate are sequentially arranged on the frame body from top to bottom, the top plate and the bottom plate are arranged in parallel relatively, shading cloth is arranged on the periphery of the bottom plate and the top plate, the bottom plate, the top plate and the shading cloth jointly form a lightless closed space, a first accommodating groove is formed in the upper surface of the bottom plate, the first detection assembly comprises an optical generator, an optical receiver and a convex lens group, the optical receiver is arranged in the first accommodating groove, an optical generator is arranged on the lower surface of the top plate and located right above the optical receiver, the convex lens group is further arranged in the first accommodating groove and is arranged above the optical receiver, and light emitted by the optical generator is focused by the convex lens group and then is received by the optical receiver; the second detection assembly comprises a handheld part and a resistance tester, the handheld part comprises an insulating tube, a first copper plate, a second copper plate, a first lead and a second lead, the first end of the first copper plate is connected with the insulating tube, the second end of the first copper plate is a free end, the first end of the second copper plate is connected with the insulating tube, the second end of the second copper plate is a free end, the resistance tester comprises a first joint and a second joint, the first end of the first lead is connected with the second end of the first copper plate, the second end of the first lead is connected with the first joint of the resistance tester, the first end of the second lead is connected with the second end of the second copper plate, and the second end of the second lead is connected with the second joint of the resistance tester; the detection method comprises the following steps:
marking a plurality of detection points on the upper surface of the shielding blanket, and detecting the insulation resistance of each detection point by using a second detection assembly;
the detection process of the second detection assembly is as follows:
the shading cloth is folded, the shading blanket is laid on the bottom plate of the first detection assembly, the resistance tester is started, the handheld part is moved to a detection point position, the lower surfaces of the first copper plate and the second copper plate are in contact with the upper surface of the shading blanket, the detection point position is located in the center of the first copper plate and the second copper plate, and the resistance value measured by the resistance tester is read;
if the resistance value of each detection point position is greater than or equal to 1000 MOmega, the shielding blanket is qualified;
if the resistance value of each detection point position is smaller than 700M omega, the shielding blanket is unqualified;
if the resistance value of any detection point position is larger than or equal to 700M omega and smaller than 1000M omega, a first detection assembly is adopted for detection;
the first detection assembly comprises the following detection processes:
moving the shielding blanket to enable the detection point with the resistance value of more than or equal to 700M omega and less than 1000M omega to be positioned right below the light generator and right above the light receiver;
putting down the shading cloth to enable the shading blanket to be positioned in a sealed space without light formed by the bottom plate, the top plate and the shading cloth;
and starting the light generator, wherein if the light receiver receives the light emitted by the light generator, the shielding blanket is unqualified, and otherwise, the shielding blanket is qualified.
2. The method of claim 1 for optical and insulation resistance based detection of a obscuring carpet: the resistance tester is used for measuring the resistance value between the first copper plate and the second copper plate.
3. The light and insulation resistance based shading carpet detection method according to claim 2, characterized by: the resistance tester is a megger.
4. The light and insulation resistance based shading carpet detection method according to claim 3, characterized by: the megger comprises an L end and an E end.
5. The light and insulation resistance based shading carpet detection method according to claim 4, characterized by: the megger also comprises a display screen.
6. The light and insulation resistance based shading carpet detection method according to claim 1, characterized by: the distance between the first copper plate and the second copper plate is 20mm.
7. The method of claim 1 for optical and insulation resistance based detection of a obscuring carpet: the upper surface of the first copper plate and the upper surface of the second copper plate are in a plane.
8. The method of claim 1 for optical and insulation resistance based detection of a obscuring carpet: the first copper plate or the second copper plate is arranged close to the bottom wall of the insulating tube.
9. The light and insulation resistance based shading carpet detection method according to claim 1, characterized by: first copper is the same with the second copper structure, first copper includes straight board, first arc, second arc, straight board, first arc, second arc are end to end in proper order, the axis direction of second arc is parallel with the upper surface of first copper, the axis direction of second arc and the last perpendicular surface of first copper.
10. The method of claim 1 for optical and insulation resistance based detection of a obscuring carpet: the first lead and the second lead are arranged in the insulating tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504186.5A CN115753695A (en) | 2022-11-28 | 2022-11-28 | Shielding carpet detection method based on light and insulation resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504186.5A CN115753695A (en) | 2022-11-28 | 2022-11-28 | Shielding carpet detection method based on light and insulation resistance |
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| Publication Number | Publication Date |
|---|---|
| CN115753695A true CN115753695A (en) | 2023-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211504186.5A Pending CN115753695A (en) | 2022-11-28 | 2022-11-28 | Shielding carpet detection method based on light and insulation resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115753695A (en) |
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2022
- 2022-11-28 CN CN202211504186.5A patent/CN115753695A/en active Pending
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