CN117347681B - DC resistance tester - Google Patents
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- CN117347681B CN117347681B CN202311656987.8A CN202311656987A CN117347681B CN 117347681 B CN117347681 B CN 117347681B CN 202311656987 A CN202311656987 A CN 202311656987A CN 117347681 B CN117347681 B CN 117347681B
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- 230000007246 mechanism Effects 0.000 claims abstract description 110
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000010891 electric arc Methods 0.000 claims abstract description 28
- 230000008030 elimination Effects 0.000 claims abstract description 7
- 238000003379 elimination reaction Methods 0.000 claims abstract description 7
- 230000035945 sensitivity Effects 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims description 23
- 239000012634 fragment Substances 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 13
- 230000008033 biological extinction Effects 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 10
- 238000004891 communication Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 230000007613 environmental effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 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
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- 238000005259 measurement Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a direct current resistance tester, which relates to the technical field of direct current resistance testers and comprises a protection box, wherein a control panel is arranged in the protection box, a display assembly is embedded in the control panel, an electric clamp assembly capable of regulating and controlling holding force is electrically connected to the upper surface of the control panel, a circuit board is arranged in the middle of an inner cavity of the protection box, the circuit board is fixed on the inner wall of the protection box through a support frame, and an arc elimination mechanism for keeping the sensitivity of an electronic element for heating the circuit board is arranged at the bottom of the circuit board. When the electric clamp assembly contacts the cable to generate an electric arc, the arc extinguishing mechanism can be matched with the supporting mechanism to eliminate the electric arc, so that the possible damage of the electric arc to equipment and personnel is avoided, the working safety is improved, the existence of the arc extinguishing mechanism increases the resistance of current, and accordingly heat is generated, the temperature of the arc extinguishing mechanism is improved, and the arc extinguishing capability of the arc extinguishing mechanism to the electric arc is enhanced.
Description
Technical Field
The invention relates to the technical field of direct current resistance testers, in particular to a direct current resistance tester.
Background
The invention discloses a direct current low-resistance tester, for example, with the publication number of CN112230059A, which comprises a box body and a base, wherein the box body comprises an outer shell and an inner shell, the outer surface of the inner shell is contacted with the outer surface of the outer shell, and a connecting mechanism is fixedly connected with the outer surface of the outer shell. This direct current low resistance tester, coupling mechanism includes the sliding tray, the internal surface sliding connection of sliding tray has the slide bar, slide bar one end fixedly connected with horizontal pole through setting up stop gear in the inside of fixed frame, first gag lever post in the cooperation stop gear, cooperation promotion groove and spacing groove, reuse second gag lever post and turning block upwards promote the second gag lever post and rotate through the turning block for one side of second gag lever post contacts with one side of first gag lever post, can dismantle fast and install the fixed frame through this structure, thereby can take off the filter screen fast, be convenient for wash it.
However, the resistance tester cannot be started up, messy codes, black screens or detection errors are too large in a low-temperature environment of a alpine region, so that the real reliability of data is affected, the direct current resistance tester cannot be started normally in a low-temperature environment in winter, and in the alpine region with high altitude, due to the specificity of environmental conditions, the high-altitude region is easy to generate electric arcs when measuring the direct current resistance, so that the accuracy of test values is affected, and therefore, the direct current resistance tester is provided to meet the demands.
Disclosure of Invention
The purpose of the present application is to provide a direct current resistance tester, which can effectively solve the problems set forth in the above background art.
In order to achieve the above purpose, the present application provides the following technical solutions: the utility model provides a direct current resistance tester, includes the guard box, the inside of guard box is provided with control panel, control panel's inside is inlayed and is had the display module, control panel's upper surface electric connection has the electricity that can regulate and control and hold the power to press from both sides the subassembly, the inner chamber middle part of guard box is provided with the circuit board, and the circuit board passes through the inner wall of support frame fixed guard box, the bottom of circuit board is provided with the electric arc elimination mechanism that keeps electronic component sensitivity for the circuit board intensification, the inner wall of guard box is provided with the heat preservation that keeps guard box inside temperature, the inner wall of guard box is provided with the power, the power passes through electric wire and circuit board electric connection;
the arc elimination mechanism comprises a temperature guide mechanism arranged at the bottom of the circuit board and used for conducting heat, an arc extinguishing mechanism used for eliminating the arc and generating heat is arranged at the bottom of the temperature guide mechanism, a supporting mechanism used for supporting the arc extinguishing mechanism and assisting the arc extinguishing mechanism to eliminate the arc is arranged at the bottom of the temperature guide mechanism, and a temperature control mechanism used for controlling the temperature of the arc extinguishing mechanism is arranged at one end of the arc extinguishing mechanism.
The display assembly comprises a mounting frame, a heating belt is arranged in the mounting frame, a liquid crystal screen is inlaid in the inner wall of the mounting frame, the heating belt is arranged in the mounting frame, a temperature controller is arranged on one side of the mounting frame, and the temperature controller is electrically connected with the heating belt.
The temperature conduction mechanism comprises a ceramic plate and a heat conduction plate, wherein the ceramic plate is arranged on a support frame at the bottom of the circuit board, and a plurality of heat conduction copper sheets are arranged between the ceramic plate and the heat conduction plate.
The supporting mechanism comprises an installation box installed at the bottom of the heat-conducting plate, a plurality of semi-arc pieces distributed in a rectangular array are arranged in the installation box, and a plurality of protruding pieces are arranged on the inner wall and the outer surface of the semi-arc pieces.
The arc extinction mechanism comprises a wire, the surface of wire is provided with a plurality of hemisphere piece that is equidistant distribution, the surface of hemisphere piece is provided with the ring piece, a plurality of the surface upper portion of hemisphere piece is provided with the copper line board jointly, the copper line board contacts with the heat conduction board bottom, the wire sets up the upper portion at a plurality of half arc piece.
The semi-arc piece is of a hemispherical arc structure, and the semi-arc piece is arranged between the two hemispherical pieces.
The temperature control mechanism comprises a ceramic shell, two bimetallic strips are arranged in the ceramic shell, contact strips are arranged on opposite surfaces of the two bimetallic strips, one ends of the two bimetallic strips are fixed on one side of the inner wall of the ceramic shell, and the other ends of the two bimetallic strips are electrically connected with a wire respectively.
The electric clamp assembly comprises a conductive wire electrically connected with a control panel, a rubber sleeve is wrapped on the outer surface of the conductive wire, a clamping grab handle is arranged at one end of the rubber sleeve, an installation groove is formed in the clamping grab handle, a clamping rod is installed in the installation groove in a rotating mode, torque springs are arranged on two sides of the clamping rod, and a groove is formed in one end of the clamping grab handle.
The inner wall of the clamping grab handle is provided with an installation box, an elastic sheet is slidably installed in the installation box, one side of the elastic sheet is provided with a partition board, and a spring is arranged on one side of the partition board and positioned in the installation box;
the inner wall of shell fragment is provided with a plurality of friction disc that is equidistant distribution, the surface of shell fragment is provided with the spring leaf and supports the shell fragment, the shell fragment passes through the spring leaf and supports shell fragment and centre gripping grab handle fixed connection, the draw-in groove has been seted up to the one end of shell fragment, and the draw-in groove is corresponding with the recess position.
In summary, the invention has the technical effects and advantages that:
when the electric clamp assembly is contacted with the cable to generate an electric arc, the arc extinguishing mechanism can be matched with the supporting mechanism to eliminate the electric arc, so that the possible damage of the electric arc to equipment and personnel is avoided, the working safety is improved, the existence of the arc extinguishing mechanism increases the resistance of current, so that heat is generated, the self temperature of the arc extinguishing mechanism is improved, the eliminating capability of the arc extinguishing mechanism to the electric arc is enhanced, the heat generated by the arc extinguishing mechanism is transferred to the temperature guide mechanism and then transferred to the circuit board by the temperature guide mechanism, the circuit board is guaranteed to work normally at low temperature, the service efficiency and the stability of the equipment are improved, the temperature control mechanism can cut off the power on of the arc extinguishing mechanism when the temperature of the arc extinguishing mechanism is overhigh, and the arc extinguishing mechanism is guaranteed not to continuously heat up so as to influence the normal working of the circuit board;
according to the invention, the elastic sheet can adapt to cables with different diameters to provide different clamping forces, the elastic sheet can be deformed to be better attached to the surface of the cable, the stability and accuracy of clamping are improved, the existence of the friction plate can prevent the elastic sheet from sliding down in the operation process, and the operation safety is improved.
The invention provides a dual heating method for heating heat and automatically heating a CPU by a temperature guide mechanism, wherein the heating method is characterized in that under normal conditions, the CPU heats the temperature of a heating element which supplies heat by the temperature guide mechanism, so that a proper temperature environment is provided for the operation of the CPU, and when the temperature of the heating element cannot ensure the working temperature of the CPU, the self-heating method of the CPU is adopted, and a constant temperature environment is provided for the operation of the CPU in a self-heating mode, so that the precision of measured data is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a DC resistance tester;
FIG. 2 is a perspective sectional view of a DC resistance tester;
FIG. 3 is a cross-sectional view of a three-dimensional connection structure of the display assembly;
FIG. 4 is an internal schematic diagram of a DC resistance tester;
FIG. 5 is a schematic diagram of a three-dimensional connection of a circuit board and an arc elimination mechanism;
FIG. 6 is a schematic view of a three-dimensional connection of an arc extinguishing mechanism;
FIG. 7 is a schematic view of a three-dimensional connection structure of the temperature guiding mechanism;
fig. 8 is a schematic view of a three-dimensional connection structure of the arc extinguishing mechanism and the supporting mechanism;
fig. 9 is a schematic view of a three-dimensional connection structure of the arc extinguishing mechanism;
fig. 10 is a schematic view of a three-dimensional connection structure of hemispherical pieces;
FIG. 11 is a schematic view of a three-dimensional connecting structure of a half-arc piece;
FIG. 12 is a schematic view of a three-dimensional connection structure of the temperature control mechanism;
FIG. 13 is a schematic view of a three-dimensional connection structure of the electrical clamp assembly;
FIG. 14 is an exploded view of a solid connection structure of the electrical clamp assembly;
FIG. 15 is a schematic view of a three-dimensional connection structure of a grip handle and a rubber sleeve;
FIG. 16 is a schematic view of a three-dimensional connection structure of a spring plate and a supporting spring plate;
FIG. 17 is a schematic view of a partial perspective connection of an electrical clamp assembly;
fig. 18 is a circuit diagram of a communication interface circuit.
In the figure: 1. a protection box; 2. a control panel; 3. a display assembly; 31. a liquid crystal panel; 32. a heating belt; 33. a mounting frame; 34. a temperature controller; 4. an electrical clamp assembly; 40. a clamping groove; 41. a rubber sleeve; 42. a conductive wire; 43. clamping the grab handle; 44. a clamping rod; 45. a spring plate; 46. a torque spring; 47. a groove; 48. a mounting groove; 49. a mounting box; 411. a friction plate; 412. a spring piece; 413. a supporting spring plate; 414. a spring; 415. a partition plate; 5. a circuit board; 6. a heat preservation layer; 7. an arc extinguishing mechanism; 71. a temperature guiding mechanism; 711. a ceramic sheet; 712. a thermally conductive copper sheet; 713. a heat conductive plate; 72. a temperature control mechanism; 721. a ceramic shell; 722. bimetallic strips; 723. a contact piece; 73. a support mechanism; 731. a mounting box; 732. a half arc piece; 733. a tab; 74. an arc extinguishing mechanism; 741. copper wire board; 742. a wire; 743. hemispherical pieces; 744. a ring piece; 8. and a power supply.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one: referring to fig. 1-18, a direct current resistance tester comprises a protection box 1, wherein a control panel 2 is arranged in the protection box 1, a display component 3 is embedded in the control panel 2, an electric clamp component 4 capable of regulating and controlling holding force is electrically connected to the upper surface of the control panel 2, a circuit board 5 is arranged in the middle of an inner cavity of the protection box 1, the circuit board 5 is fixed on the inner wall of the protection box 1 through a supporting frame, an arc elimination mechanism 7 for keeping the sensitivity of electronic elements when the temperature of the circuit board 5 rises is arranged at the bottom of the circuit board 5, a heat insulation layer 6 for keeping the temperature inside the protection box 1 is arranged on the inner wall of the protection box 1, a power supply 8 is arranged on the inner wall of the protection box 1, and the power supply 8 is electrically connected with the circuit board 5 through wires;
the arc extinguishing mechanism 7 includes a temperature guiding mechanism 71 provided at the bottom of the circuit board 5 for conducting heat, an arc extinguishing mechanism 74 for extinguishing an arc and generating heat is provided at the bottom of the temperature guiding mechanism 71, a supporting mechanism 73 for supporting the arc extinguishing mechanism 74 and assisting the arc extinguishing mechanism 74 in extinguishing the arc is provided at the bottom of the temperature guiding mechanism 71, and a temperature control mechanism 72 for controlling the temperature of the arc extinguishing mechanism 74 is provided at one end of the arc extinguishing mechanism 74.
It is worth to say that, under the low temperature environment of the alpine region, the ordinary direct current resistance tester can appear unable start, messy code, black screen or detect the error too big, and then influence the true reliability of data, under the lower temperature in winter, the CPU of direct current resistance tester often can appear unable normal start to in the alpine region of high altitude, because of the specificity of environmental condition, make the high altitude region have the production of electric arc when measuring direct current resistance easily and then influence the accuracy of test value, and the produced electric arc of the special high altitude region of environment is also different with plain region, mainly divide into following points:
air density: the air density of the high-altitude area is lower, so that the propagation speed and energy loss of the electric arc are different from those of the plain area, the electric arc can be easier to spread in the high-altitude area, and the energy attenuation is slower;
temperature influence: the low-temperature environment in the alpine region has influence on the generation and propagation of the electric arc, and under the low-temperature condition, the movement speed of electrons and ions in the electric arc is reduced, and the propagation speed and stability of the electric arc can be influenced;
humidity influence: the humidity in the alpine region is lower, and the moisture in the air is reduced, so that electric arcs can be generated more easily;
air pressure influence: the air pressure in the high-altitude area is lower, so that the propagation and extinction of the electric arc are affected, the electric arc can be extinguished more easily under the low-air pressure condition, and the probability of the re-generation of the electric arc can be increased;
wind speed influence: the wind power in the high altitude area is larger, the wind speed has influence on the propagation and stability of the electric arc, and the larger wind speed accelerates the extinction of the electric arc, but the electric arc is easier to generate.
In order to solve the problem that the low-temperature environment in the alpine region affects the direct current resistance tester, the electric clamp assembly 4 is clamped or drooping is placed on the cable when the electric clamp assembly is used, the electric clamp assembly 4 can be clamped on the cable with a larger contact area through the special structural design of the electric clamp assembly 4, the current transmission efficiency is improved, the resistance is reduced, the waste of energy is avoided, the current is transmitted to the arc extinguishing mechanism 74 through the electric clamp assembly 4, when the electric clamp assembly 4 contacts the cable to generate an arc, the arc extinguishing mechanism 74 can be matched with the supporting mechanism 73 to eliminate the generated arc, and heat is generated due to the fact that the arc extinguishing mechanism 74 is arranged to increase the resistance of the current when the current passes through the arc extinguishing mechanism 74, the heat generated by the arc extinguishing mechanism 74 is transmitted to the heat conducting mechanism 71, and the heat conducting mechanism 71 transmits the heat to the circuit board 5;
when the electric clamp assembly 4 contacts the cable to generate an arc, the arc extinguishing mechanism 74 can be matched with the supporting mechanism 73 to eliminate the arc, so that the possible damage of the arc to equipment and personnel is avoided, the working safety is improved, the existence of the arc extinguishing mechanism 74 increases the resistance of current, and heat is generated, the self temperature of the arc extinguishing mechanism 74 is improved, the arc eliminating capability of the arc extinguishing mechanism is enhanced, the heat generated by the arc extinguishing mechanism 74 is transferred to the temperature guide mechanism 71 and then transferred to the circuit board 5 by the temperature guide mechanism 71, the normal work of the circuit board at low temperature is ensured, the service efficiency and the stability of the equipment are improved, the temperature control mechanism 72 can cut off the power supply of the arc extinguishing mechanism 74 when the temperature of the arc extinguishing mechanism 74 is overhigh, and the normal work of the circuit board 5 is ensured not to be continuously heated up;
the circuit board 5 detects the resistance on the cable through the electric clamp assembly 4, and the temperature provided by the temperature guide mechanism 71 can ensure that the electronic components on the circuit board 5 can normally operate at a lower temperature;
the CPU on the circuit board 5 is used as the core part of the resistance tester, the working state of the CPU directly determines the working performance of the direct current resistance tester, and in a low-temperature environment, the problem that the low temperature cannot be started due to the fact that the common low-temperature characteristic of the CPU is poor is solved;
the CPU self-heating step is specifically as follows:
s1, starting power supply of a system;
s2, judging whether a main control CPU is started or not through an auxiliary controller;
s3, judging whether the temperature is higher than a safety value or not through a temperature detection unit;
s4, cutting off the power supply of the main control CPU and simultaneously starting heating through the heating unit;
s5, judging whether heating is overtime or not through the auxiliary controller.
After the power is on, the system supplies power to start, the power supply supplies power to the main control CPU, then the process is started, the auxiliary controller detects whether the main control CPU is started, if so, the process is ended, the system is started, if not, the process is started, the auxiliary controller detects the current temperature, if the temperature is higher than a safety value, the auxiliary controller does not operate, and the system is continued to wait for the system to start;
if the temperature is lower than the safety value, the process is started, the auxiliary controller cuts off the power supply of the main control CPU and simultaneously starts heating, then the process is started, the auxiliary controller judges whether the heating is overtime, if not, the process is returned, whether the temperature is in the safety range is continuously detected, after the temperature reaches the safety range, the process is returned, the power supply of the system is attempted to be supplied again, the system is started, if the heating is overtime, the process is directly returned, and the system is attempted to be started;
aiming at the technical problems of communication in the existing low-temperature environment, the heating of the communication module on the circuit board 5 is realized through the heat provided by the temperature guide mechanism 71, so that the problem that the communication module is not smooth due to the too low temperature is solved, meanwhile, according to the different level problems, a MAX3232E level conversion chip shown in figure 18 is adopted for realizing the communication between a singlechip and a microcomputer, the chip is used for carrying out point-to-point communication between the singlechip and the computer, two transmitting pins (TX 00 and TX 11) and two receiving pins (RX 00 and RX 11) are arranged, the UARTO and DART 1 can be respectively used, an ESD protection circuit of +/-15 kV is provided, the device is prevented from being damaged by electrostatic discharge, the communication is completed only by a pair of serial ports, the communication design difficulty is reduced, and meanwhile, the communication quality is guaranteed.
Embodiment two: the display assembly 3 shown in fig. 3 comprises a mounting frame 33, wherein a heating belt 32 is arranged in the mounting frame 33, a liquid crystal screen 31 is embedded in the inner wall of the mounting frame 33, the heating belt 32 is arranged in the mounting frame 33, a temperature controller 34 is arranged on one side of the mounting frame 33, and the temperature controller 34 is electrically connected with the heating belt 32.
Wherein, in the high altitude alpine region LCD screen 31 because of the problem that the display screen is fuzzy and trailing appears in the inside crystallization of lower LCD screen 31 of temperature, inlay LCD screen 31 in installing frame 33 and adopt temperature controller 34 control heating tape 32 heating, the heat transfer that will heat tape 32 produced is to LCD screen 31 on, temperature controller 34 in time carries out heating treatment to heating tape 32 when using, until LCD screen 31 temperature reaches the standard of normal demonstration, through the temperature control to LCD screen 31 solve LCD screen 31 fuzzy and trailing problem.
And (3) implementation: as shown in fig. 4-12, the arc extinguishing mechanism 74 includes a conductive wire 742, a plurality of hemispherical fins 743 distributed at equal intervals are provided on the outer surface of the conductive wire 742, a ring fin 744 is provided on the outer surface of the hemispherical fin 743, copper wire boards 741 are provided on the upper parts of the outer surfaces of the hemispherical fins 743, the copper wire boards 741 are in contact with the bottom of the heat conductive plate 713, and the conductive wire 742 is provided on the upper parts of the plurality of semi-arc fins 732.
The half arc piece 732 has a hemispherical arc structure, and the half arc piece 732 is disposed between the two hemispherical pieces 743.
It should be noted that, when an arc is generated, the current is transferred to the wire 742 through the electrical clamp assembly 4, the hemispherical sheets 743 on the wire 742 are distributed at equal intervals and are matched with the protruding structures of the ring sheets 744, so that the arc can be eliminated in the transfer of each hemispherical sheet 743, the hemispherical sheets 743 and the ring sheets 744 are metals with larger resistance, when the current passes through the wire 742, the hemispherical sheets 743 are slowly warmed up due to larger current passing resistance, and the copper wire sheet 741 further increases the resistance of the hemispherical sheets 743, so that the hemispherical sheets 743 and the copper wire sheet 741 quickly warm up to transfer heat to the heat conducting mechanism 71.
The special structural design of the hemispherical sheets 743 and the annular sheets 744 enables the electric arc to be transferred between the hemispherical sheets 743 and gradually eliminated, so that the measurement accuracy and safety are improved, the high resistance of the hemispherical sheets 743 and the annular sheets 744 enables the electric current to be quickly heated when passing through, the difficulty of electric arc generation is increased, and meanwhile, the heat can be quickly transferred to the temperature guide mechanism 71, so that the circuit board 5 is protected to work normally in a low-temperature environment;
the high resistance of the hemispherical sheet 743 and the annular sheet 744 can generate a large amount of heat when the current passes through, and the heat can be quickly transferred to the temperature guiding mechanism 71, so that the circuit board 5 can work normally at low temperature, the equipment can work normally at low temperature, and the reliability and stability of the equipment are improved.
The supporting mechanism 73 comprises a mounting box 731 mounted at the bottom of the heat conducting plate 713, a plurality of half arc pieces 732 distributed in a rectangular array are arranged in the mounting box 731, and a plurality of protruding pieces 733 are arranged on the inner wall and the outer surface of the half arc pieces 732.
When the hemispherical pieces 743 are used to eliminate the arc, the hemispherical pieces 743 are assisted by the protruding pieces 733 by the half arc pieces 732 provided between the hemispherical pieces 743 to eliminate the arc, and the half arc pieces 732 are formed in the shape shown in fig. 11 so as to be bonded to the hemispherical pieces 743 to eliminate the arc, and the half arc pieces 732 are formed of a ceramic material so as to support the hemispherical pieces 743 from contacting the mounting case 731.
The auxiliary of half arc piece 732 through lug 733 can help half sphere piece 743 to eliminate the electric arc better, has improved measuring accuracy and security, and half arc piece 732 is ceramic structure moreover, can prevent half sphere piece 743 to contact mounting box 731, has protected half sphere piece 743 not damaged.
The temperature-conducting mechanism 71 comprises a ceramic plate 711 and a heat-conducting plate 713, wherein the ceramic plate 711 is arranged on a support frame at the bottom of the circuit board 5, and a plurality of heat-conducting copper sheets 712 are arranged between the ceramic plate 711 and the heat-conducting plate 713;
after the heat is transferred to the heat conducting plate 713, the temperature is transferred to the ceramic plate 711 again through the heat conducting copper sheet 712, wherein the heat conducting copper sheet 712 is in the shape of letter "S" in fig. 7, which can increase the contact area with air, thereby heating the air in the protection box 1, and by heating the air inside the protection box 1 and the ceramic plate 711 in a double-layer manner, the circuit board 5 is operated at a proper temperature, thereby ensuring the accuracy of the detection value.
The temperature control mechanism 72 includes a ceramic shell 721, two bimetallic strips 722 are disposed inside the ceramic shell 721, contact strips 723 are disposed on opposite surfaces of the two bimetallic strips 722, one ends of the two bimetallic strips 722 are fixed on one side of an inner wall of the ceramic shell 721, and the other ends of the two bimetallic strips 722 are electrically connected with wires 742 respectively.
It should be noted that, when the current passes through the arc extinguishing mechanism 74 for a long time, the temperature of the arc extinguishing mechanism 74 will also rise gradually, the temperature on the arc extinguishing mechanism 74 will also be transmitted to the bimetal 722 through the wire 742, and after the bimetal 722 is heated, the bimetal 722 is deformed due to the different heated temperatures of the two metals, and the deformed bimetal 722 breaks the two contact plates 723, so that the circuit elements on the circuit board 5 are prevented from being damaged by the continuous temperature rise of the arc extinguishing mechanism 74.
Embodiment four: the electric clamp assembly 4 shown in fig. 13-17 comprises a conductive wire 42 electrically connected with the control panel 2, a rubber sleeve 41 is wrapped on the outer surface of the conductive wire 42, a clamping grab handle 43 is arranged at one end of the rubber sleeve 41, a mounting groove 48 is formed in the clamping grab handle 43, a clamping rod 44 is rotatably mounted in the mounting groove 48, torque springs 46 are arranged on two sides of the clamping rod 44, and a groove 47 is formed in one end of the clamping grab handle 43.
It should be noted that, in use, the clamping rod 44 is pinched to rotate in the mounting groove 48, the mounting groove 48 drives the torque spring 46 to rotate, and the inner wall of the clamping rod 44 is provided with an anti-slip groove.
The inner wall of the clamping grab handle 43 is provided with an installation box 49, a spring plate 45 is slidably installed in the installation box 49, one side of the spring plate 45 is provided with a partition plate 415, and a spring 414 is arranged on one side of the partition plate 415 and positioned in the installation box 49;
the inner wall of shell fragment 45 is provided with a plurality of friction disc 411 that are equidistant distribution, and the surface of shell fragment 45 is provided with spring leaf 412 and support shell fragment 413, and shell fragment 45 passes through spring leaf 412 and support shell fragment 413 and centre gripping grab handle 43 fixed connection, and draw-in groove 40 has been seted up to the one end of shell fragment 45, and draw-in groove 40 and recess 47 position are corresponding.
When the clamping lever 44 is opened, the user places the clamping handle 43 on the cable, the surface of the cable is arc-shaped, so that the elastic sheet 45 deforms when contacting the surface of the cable, the elastic sheet 45 deforms to drive the partition 415 to press the spring 414 to shrink, the elastic sheet 45 forms a shape which can be more attached to the surface of the cable, the friction plate 411 can prevent the elastic sheet 45 from sliding down, the spring piece 412 can provide elasticity for the elastic sheet 45, and one end of the clamping lever 44 is pinched inside the groove 47 and the clamping groove 40 when the cable is clamped, so that the clamping handle 43 is fixed on the surface of the cable;
and the elastic sheet 45 is the shape design of fig. 13-17, can let the elastic sheet 45 adapt to the cable of different diameters to provide different clamping forces, and the deformation of elastic sheet 45 can make it laminate on the surface of cable better, has improved the stability and the accuracy of centre gripping, and the existence of friction disc 411 can prevent that elastic sheet 45 from landing in the operation process, has improved the security of operation.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (4)
1. The utility model provides a direct current resistance tester, includes guard box (1), the inside of guard box (1) is provided with control panel (2), its characterized in that: the electronic device is characterized in that a display assembly (3) is embedded in the control panel (2), an electric clamp assembly (4) capable of adjusting and controlling holding force is electrically connected to the upper surface of the control panel (2), a circuit board (5) is arranged in the middle of an inner cavity of the protection box (1), the circuit board (5) is fixed to the inner wall of the protection box (1) through a supporting frame, an arc elimination mechanism (7) for keeping sensitivity of electronic elements when the temperature of the circuit board (5) rises is arranged at the bottom of the circuit board (5), a heat preservation layer (6) for keeping the temperature inside the protection box (1) is arranged on the inner wall of the protection box (1), a power supply (8) is arranged on the inner wall of the protection box (1), and the power supply (8) is electrically connected with the circuit board (5) through wires;
the electric arc elimination mechanism (7) comprises a temperature guide mechanism (71) arranged at the bottom of the circuit board (5) and used for conducting heat, an arc extinction mechanism (74) for eliminating electric arc and generating heat is arranged at the bottom of the temperature guide mechanism (71), a supporting mechanism (73) used for supporting the arc extinction mechanism (74) and assisting the arc extinction mechanism (74) in eliminating the electric arc is arranged at the bottom of the temperature guide mechanism (71), and a temperature control mechanism (72) for controlling the temperature of the arc extinction mechanism (74) is arranged at one end of the arc extinction mechanism (74);
the temperature guide mechanism (71) comprises a ceramic sheet (711) and a heat conduction plate (713), wherein the ceramic sheet (711) is arranged on a support frame at the bottom of the circuit board (5), and a plurality of heat conduction copper sheets (712) are arranged between the ceramic sheet (711) and the heat conduction plate (713);
the supporting mechanism (73) comprises a mounting box (731) arranged at the bottom of the heat conducting plate (713), a plurality of half-arc sheets (732) distributed in a rectangular array are arranged in the mounting box (731), and a plurality of protruding sheets (733) are arranged on the inner wall and the outer surface of each half-arc sheet (732);
the arc extinction mechanism (74) comprises a wire (742), a plurality of hemispherical plates (743) which are distributed at equal intervals are arranged on the outer surface of the wire (742), ring plates (744) are arranged on the outer surface of the hemispherical plates (743), copper wire plates (741) are arranged on the upper parts of the outer surfaces of the hemispherical plates (743) together, the copper wire plates (741) are in contact with the bottoms of the heat conducting plates (713), and the wire (742) is arranged on the upper parts of the plurality of semi-arc plates (732);
the half arc piece (732) is in a hemispherical arc structure, and the half arc piece (732) is arranged between the two hemispherical pieces (743).
2. The direct current resistance tester according to claim 1, wherein: the display assembly (3) comprises a mounting frame (33), a heating belt (32) is arranged in the mounting frame (33), a liquid crystal screen (31) is inlaid in the inner wall of the mounting frame (33), the heating belt (32) is arranged in the mounting frame (33), a temperature controller (34) is arranged on one side of the mounting frame (33), and the temperature controller (34) is electrically connected with the heating belt (32).
3. The direct current resistance tester according to claim 1, wherein: the temperature control mechanism (72) comprises a ceramic shell (721), two bimetallic strips (722) are arranged in the ceramic shell (721), contact strips (723) are arranged on opposite surfaces of the bimetallic strips (722), one ends of the bimetallic strips (722) are fixed on one side of the inner wall of the ceramic shell (721), and the other ends of the bimetallic strips (722) are electrically connected with leads (742) respectively.
4. The direct current resistance tester according to claim 1, wherein: the electric clamp assembly (4) comprises a conductive wire (42) electrically connected with the control panel (2), a rubber sleeve (41) is wrapped on the outer surface of the conductive wire (42), a clamping grab handle (43) is arranged at one end of the rubber sleeve (41), a mounting groove (48) is formed in the clamping grab handle (43), a clamping rod (44) is rotatably arranged in the mounting groove (48), torque springs (46) are arranged on two sides of the clamping rod (44), and a groove (47) is formed in one end of the clamping grab handle (43);
the inner wall of the clamping grab handle (43) is provided with an installation box (49), an elastic sheet (45) is slidably installed in the installation box (49), one side of the elastic sheet (45) is provided with a partition plate (415), and a spring (414) is arranged on one side of the partition plate (415) and positioned in the installation box (49);
the inner wall of shell fragment (45) is provided with a plurality of friction disc (411) that are equidistant distribution, the surface of shell fragment (45) is provided with spring leaf (412) and supports shell fragment (413), shell fragment (45) are through spring leaf (412) and support shell fragment (413) and centre gripping grab handle (43) fixed connection, draw-in groove (40) have been seted up to the one end of shell fragment (45), and draw-in groove (40) are corresponding with recess (47) position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311656987.8A CN117347681B (en) | 2023-12-06 | 2023-12-06 | DC resistance tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311656987.8A CN117347681B (en) | 2023-12-06 | 2023-12-06 | DC resistance tester |
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| CN117347681A CN117347681A (en) | 2024-01-05 |
| CN117347681B true CN117347681B (en) | 2024-02-13 |
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