CN110568288A - Device and method for diagnosing loosening of screw of terminal strip of switch cabinet - Google Patents
Device and method for diagnosing loosening of screw of terminal strip of switch cabinet Download PDFInfo
- Publication number
- CN110568288A CN110568288A CN201910873733.9A CN201910873733A CN110568288A CN 110568288 A CN110568288 A CN 110568288A CN 201910873733 A CN201910873733 A CN 201910873733A CN 110568288 A CN110568288 A CN 110568288A
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- screw
- force sensitive
- resistance value
- loosened
- screws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a device for diagnosing the looseness of a screw of a terminal block of a switch cabinet, which comprises a looseness detection module, wherein the looseness detection module comprises a plurality of spring pieces respectively penetrating through the bottoms of a plurality of screws, one ends of the spring pieces are provided with through holes and are fixed on terminal block metal sheets through screws, the other ends of the spring pieces are pressed on force sensitive resistors, the force sensitive resistors, a bulb and an ammeter are connected to two ends of a power supply in series, and the force sensitive resistors are mutually connected in parallel. The device also comprises a calculation analysis module connected with the ammeter and an output display module for displaying the diagnosis result. The invention also discloses a diagnosis method for the looseness of the screw of the terminal strip of the switch cabinet, which comprises the following steps: detecting the actual resistance value of the force sensitive resistor; measuring the current value of the branch where the force sensitive resistor is located, calculating the actual resistance value R of the force sensitive resistor according to the current value and the preset resistance value R0and comparing and judging whether the screw is loosened. The invention can visually judge the screws which are likely to be loosened and can also determine the loosened screws to quickly and effectively check the loosened screws.
Description
Technical Field
The invention relates to a device and a method for diagnosing loosening of screws of a terminal block of a switch cabinet, and belongs to the technical field of power systems.
background
a switch cabinet (i.e., a switch cabinet) is an electrical device, and is mainly used for opening, closing, controlling and protecting electrical equipment in the process of generating, transmitting, distributing and converting electric energy of an electric power system. The components in the switch cabinet mainly comprise a circuit breaker, a disconnecting switch, a load switch, an operating mechanism, a mutual inductor, various protection devices and the like. The terminal strip is an electrical component for connecting circuits in electrical equipment. The number of the wiring end points of each row of the wiring terminal row is different, the type of the wiring terminal row can be determined according to the requirements of engineering technical parameters, the connection mode comprises screw connection, welding, crimping, winding connection and the like, wherein the screw connection is the connection mode of a screw type wiring terminal row.
The wiring terminals on the terminal block of the switch cabinet are dense and various, the loosening of any one of the fastening screws can cause the fault of the power system, the potential safety hazard is generated, and the loosening screws are difficult to quickly and effectively find out due to the dense arrangement and the various quantity of the wiring terminals. Therefore, it is urgently needed to design a diagnosis device and a diagnosis method capable of simply, effectively and timely diagnosing whether the screw is loosened.
Disclosure of Invention
The invention aims to overcome the defect that the screw loosening of a terminal block in the prior art is difficult to detect quickly, effectively and timely, and provides a diagnosis device for the screw loosening of the terminal block of a switch cabinet, which has the following technical scheme:
The device for diagnosing the looseness of the screws of the terminal row of the switch cabinet comprises a looseness detection module, wherein the looseness detection module comprises a plurality of spring pieces which are respectively arranged at the bottoms of a plurality of screws in a penetrating mode, one ends of the spring pieces are provided with through holes and fixed on a metal sheet of the terminal row through screws, the other ends of the spring pieces are pressed on force sensitive resistors, the force sensitive resistors are connected with a bulb and an ammeter in series at two ends of a power supply, and the force sensitive resistors are mutually connected in parallel.
Further, the device also comprises a calculation and analysis module connected with the ammeter, and the calculation and analysis module receives the measurement of the ammeterCalculating the actual resistance value R of the force sensitive resistor, and when the actual resistance value R is smaller than the preset resistance value R of the force sensitive resistor0Time, screw loosening is indicated.
Preferably, the screw loosening detection device further comprises an output display module, the calculation analysis module outputs the calculation analysis result to the output display module, and the output display module displays the loosened screw number. .
The invention also discloses a diagnosis method for the looseness of the screw of the terminal strip of the switch cabinet, which comprises the following steps:
detecting the actual resistance value of the force sensitive resistor;
Measuring the current value of a branch where the force sensitive resistor is located, and calculating the actual resistance value R of the force sensitive resistor according to the current value;
The actual resistance value R of the force sensitive resistor is smaller than the preset resistance value R0indicating that the screw has loosened;
the actual resistance value R of the force sensitive resistor is greater than or equal to the preset resistance value R0Indicating that the screw is not loosened.
Further, the display device also comprises a display of the loosened or non-loosened state of the screw.
compared with the prior art, the invention has the following beneficial effects:
The invention can intuitively judge the screws which are likely to be loosened according to the brightness of the bulb, can quantitatively and accurately determine the screws which are loosened on an output display module, namely a display screen, can quickly and effectively find the screws which are loosened in a terminal row of a switch cabinet with dense wiring terminals and various quantities, and further can timely and effectively prevent the power system from being broken down due to the loosening of the screws. The principle adopted by the invention is simple and clear, and the use is convenient.
Drawings
FIG. 1 is a view showing the structure of a screw loosening diagnosis apparatus according to the present invention;
FIG. 2 is a schematic view of a spring plate according to the present invention;
FIG. 3 is a flow chart of a screw loosening diagnostic method of the present invention;
In the figure: 1-looseness detection module, 11-terminal row metal sheet, 12-screw, 13-spring sheet, 13 a-horizontal part, 13 b-inclined part, 13 c-through hole, 14-force sensitive resistor, 15-bulb, 16-ammeter, 17-power supply, 2-calculation analysis module and 3-output display module.
Detailed Description
the invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and 3, the device for diagnosing the looseness of the screw in the terminal strip of the switch cabinet comprises a looseness detection module 1, wherein the looseness detection module 1 comprises a plurality of spring pieces 13 respectively penetrating the bottoms of a plurality of screws 12, one ends of the spring pieces 13 are provided with through holes and fixed on a terminal strip metal sheet 11 through the screws 12, the other ends of the spring pieces are pressed on force sensitive resistors 14, the force sensitive resistors 14, a bulb 15 and an ammeter 16 are connected in series at two ends of a power supply 17, and the force sensitive resistors 14 are mutually connected in parallel. In this embodiment, the bulb 15 is preferably a small bulb.
Specifically, the device further comprises a calculation and analysis module 2 connected with the ammeter 16, wherein the calculation and analysis module 2 receives the current value measured by the ammeter 16, calculates the actual resistance value R of the force sensitive resistor 14, and when the actual resistance value R is smaller than the preset resistance value R of the force sensitive resistor 140indicating that the screw 12 is loose.
In this embodiment, the screw loosening device further includes an output display module 3, the calculation analysis module outputs the calculation analysis result to the output display module 3, and the output display module 3 displays the number of the loosened screw. .
specifically, in the present embodiment, the diagnosis result includes the number of loose screws and the number of screws.
during installation, the screw 12 is fastened on the terminal of the terminal block; the spring plate 13 is disposed between the terminal block metal plate 11 and the screw 12, one end of the spring plate 13 is pressed by the screw 12, and the other end is disposed on the force-sensitive resistor 14 and exerts a pressure thereon. The force sensitive resistor 14 is connected in series with the bulb 15, the ammeter 16 and the power supply 17. The n terminals on the terminal row are all arranged as above, and the corresponding n bulbs 15 and the ammeter 16 are connected in series and then connected in parallel to the power supply 17 of the device.
As shown in fig. 2, in the screw loosening diagnosis device, the spring piece 13 has a plate shape, the spring piece 13 includes a horizontal portion 13a and an inclined portion 13b, and the through hole 13c is provided in the horizontal portion 13 a. The spring plate 13 can be divided into a horizontal part 13a and an inclined part 13b according to whether an included angle exists with the horizontal plane, and the through hole 13c is used for the rod part of the screw 12 to penetrate.
preferably, the angle θ between the inclined portion 13b of the spring piece 13 and the horizontal plane is 15 °.
Referring to fig. 3, the method for diagnosing the screw loosening of the terminal block of the switch cabinet comprises the following steps:
Detecting the actual resistance value of the force sensitive resistor 14;
Measuring the current value of the branch where the force sensitive resistor 14 is located, and calculating the actual resistance value R of the force sensitive resistor 14 according to the current value;
The actual resistance value R of the force sensitive resistor 14 is smaller than the preset resistance value R0Indicating that the screw 12 has loosened;
The actual resistance value R of the force sensitive resistor 14 is greater than or equal to the predetermined resistance value R0Indicating that the screw 12 is not loosened.
Specifically, an indication of the loosened or non-loosened state of the screw 12 is also included. A predetermined resistance value R0The minimum resistance value of the force sensitive resistor 14 corresponding to the maximum loosening degree of the screw 12 is allowed if R is greater than or equal to R0The screw 12 is not loosened, if R< R0The screw 12 is loosened and the screw 12 needs to be retightened.
The following detailed description of the diagnosis method is given by taking an m-number screw (1 ≦ m ≦ n, n being the number of terminals to be tested on the terminal row of the switch cabinet) as an example, as shown in FIG. 1:
when the m-number screw on the terminal row loosens;
the compression action of the m-shaped screw on the spring piece 13 is reduced, so that the pressure of the spring piece 13 on the force-sensitive resistor 14 is reduced;
The resistance R of the force sensitive resistor 14 decreases;
The current of a circuit in series with the m-number screw is increased, the brightness of the corresponding m-number bulb is enhanced, and the m-number screw can be visually judged to be loosened;
The current value measured by the ammeter 16 is transmitted toThe calculation and analysis module 2, the calculation and analysis module 2 calculates the resistance R of the force sensitive resistor 14 according to the voltage and current values of the power supply 17, and the resistance R is compared with a preset value R0For comparison, R<R0and obtaining a diagnosis result, wherein the m-number screw is loosened.
The calculation analysis module 2 outputs the diagnosis result to the output display module 3, and the display screen displays that the m-number screw 12 is loosened.
As shown in fig. 1 and 3, the detection principle is as follows: the looseness detection module 1 detects the change of the tightness degree of the screw 12, namely the change of the pressing action of the screw 12 on the spring piece 13, and the change is converted into the change of the resistance value of the force-sensitive resistor 14 through the pressure action of the spring piece 13 on the force-sensitive resistor 14, so that the change is reflected as the current change and the brightness degree change of a bulb 15 in a series circuit of the force-sensitive resistor 14; the larger the resistance value is, the darker the bulb 15 is, and the calculation and analysis module 2 receives the current value measured by the ammeter 16 to perform calculation and analysis so as to judge whether the screw 12 is loosened. And transmits the diagnosis result to the output display module 3.
According to the invention, the screws 12 which are likely to be loosened can be intuitively judged according to the brightness of the bulbs 15, the display numbers of the screws 12 which are likely to be loosened can be accurately determined on the output display module 3, namely a display screen, and the loosened screws 12 can be quickly and effectively checked in the terminal rows of the switch cabinet with dense wiring terminals and a large number of wiring terminals, so that the power system can be prevented from being broken down in time and effectively. The principle adopted by the invention is simple and clear, and the use is convenient.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The device for diagnosing the looseness of the screws in the terminal row of the switch cabinet is characterized by comprising a looseness detection module, wherein the looseness detection module comprises a plurality of spring pieces which are respectively arranged at the bottoms of a plurality of screws in a penetrating mode, one ends of the spring pieces are provided with through holes and are fixed on metal sheets of the terminal row through screws, the other ends of the spring pieces are arranged on force sensitive resistors in a pressing mode, the force sensitive resistors, a bulb and an ammeter are connected to two ends of a power supply in series, and the force sensitive resistors are mutually connected in parallel.
2. The screw loosening diagnostic device according to claim 1, further comprising a calculation and analysis module connected to the ammeter, wherein the calculation and analysis module receives the current value measured by the ammeter, calculates an actual resistance value R of the force sensitive resistor, and when the actual resistance value R is smaller than a preset resistance value R of the force sensitive resistor0Time, screw loosening is indicated.
3. the screw loosening diagnostic apparatus according to claim 2, further comprising an output display module, wherein the calculation and analysis module outputs a result of the calculation and analysis to the output display module, and the output display module displays a screw number at which loosening has occurred.
4. the screw loosening diagnostic device according to claim 3, wherein the diagnostic result includes the number of screws that have loosened and a screw number.
5. the screw loosening diagnostic device according to any one of claims 1 to 4, wherein the spring plate is plate-shaped, the spring plate includes a horizontal portion and an inclined portion, and the through hole is provided on the horizontal portion.
6. The screw loosening diagnostic device of claim 5, wherein the angle θ between the inclined portion of the spring plate and the horizontal plane is 15 °.
7. the diagnosis method for the looseness of the screw of the terminal block of the switch cabinet is characterized by comprising the following steps of:
detecting the actual resistance value of the force sensitive resistor;
measuring the current value of the branch where the force sensitive resistor is located, and calculating the actual resistance value R of the force sensitive resistor according to the current value;
The actual resistance value R of the force sensitive resistor is smaller than the preset resistance value R0Indicating that the screw has loosened;
the actual resistance value R of the force sensitive resistor is greater than or equal to the preset resistance value R0Indicating that the screw is not loosened.
8. The diagnostic method of claim 7, further comprising displaying a loosened or non-loosened state of the screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873733.9A CN110568288A (en) | 2019-09-17 | 2019-09-17 | Device and method for diagnosing loosening of screw of terminal strip of switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873733.9A CN110568288A (en) | 2019-09-17 | 2019-09-17 | Device and method for diagnosing loosening of screw of terminal strip of switch cabinet |
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| CN110568288A true CN110568288A (en) | 2019-12-13 |
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| CN201910873733.9A Pending CN110568288A (en) | 2019-09-17 | 2019-09-17 | Device and method for diagnosing loosening of screw of terminal strip of switch cabinet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415430A (en) * | 2020-11-04 | 2021-02-26 | 合肥力高动力科技有限公司 | Diagnosis method for disconnection and connection looseness of Hall current sensor |
| CN116482437A (en) * | 2023-04-26 | 2023-07-25 | 南通大学 | Breakpoint detection device based on bidirectional detection method and application method thereof |
| CN117168294A (en) * | 2023-09-04 | 2023-12-05 | 大庆石油管理局有限公司 | Screw looseness alarm device based on displacement of motor of tower type pumping unit |
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| JP2006310165A (en) * | 2005-04-28 | 2006-11-09 | Kawamura Electric Inc | Ground-fault interruptor having screw loosening sensor |
| CN101183022A (en) * | 2007-11-11 | 2008-05-21 | 冷亮 | Easy high-performance solar water heater juice level indicator |
| CN102136367A (en) * | 2010-12-18 | 2011-07-27 | 桂林电力电容器有限责任公司 | Electric leading-out terminal of power capacitor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415430A (en) * | 2020-11-04 | 2021-02-26 | 合肥力高动力科技有限公司 | Diagnosis method for disconnection and connection looseness of Hall current sensor |
| CN112415430B (en) * | 2020-11-04 | 2022-09-06 | 合肥力高动力科技有限公司 | Diagnosis method for disconnection and connection looseness of Hall current sensor |
| CN116482437A (en) * | 2023-04-26 | 2023-07-25 | 南通大学 | Breakpoint detection device based on bidirectional detection method and application method thereof |
| CN116482437B (en) * | 2023-04-26 | 2023-10-31 | 南通大学 | Breakpoint detection device based on bidirectional detection method and application method thereof |
| CN117168294A (en) * | 2023-09-04 | 2023-12-05 | 大庆石油管理局有限公司 | Screw looseness alarm device based on displacement of motor of tower type pumping unit |
| CN117168294B (en) * | 2023-09-04 | 2024-04-30 | 大庆石油管理局有限公司 | Screw looseness alarm device based on displacement of motor of tower type pumping unit |
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Application publication date: 20191213 |