CN208383987U - A kind of test device of rapid survey conductor resistance - Google Patents
A kind of test device of rapid survey conductor resistance Download PDFInfo
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- CN208383987U CN208383987U CN201821055605.0U CN201821055605U CN208383987U CN 208383987 U CN208383987 U CN 208383987U CN 201821055605 U CN201821055605 U CN 201821055605U CN 208383987 U CN208383987 U CN 208383987U
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Abstract
The utility model relates to a kind of test devices of rapid survey conductor resistance, including rack and mounting platform plate, the left and right both ends of mounting platform plate are symmetrically arranged with two electric current loading mechanisms, two electric current loading mechanisms are connect with the current terminal of instrument for measuring DC resistance, Liang Ge voltage measurement mechanism is symmetrically arranged between two electric current loading mechanisms, it is symmetrically arranged with two supporting mechanisms between Liang Ge voltage measurement mechanism, places sample in supporting mechanism and voltage measurement mechanism；It is equipped with loading mechanism fixed plate above Liang Ge voltage measurement mechanism, voltage measurement mechanism loading device is installed in loading mechanism fixed plate；Liang Ge voltage measurement mechanism loading device is connect with the voltage measuring terminal of instrument for measuring DC resistance；Rack side is equipped with operation control portion, and operation control portion and each electric current loading mechanism, voltage measurement mechanism, voltage measurement mechanism loading device are all connected with setting.The utility model test speed is fast, and measuring accuracy is high, measurement safety.
Description
Technical field
The utility model relates to a kind of test devices of rapid survey conductor resistance.
Background technique
It to guarantee engineering construction quality, needs to carry out necessary detection to used raw material, wherein to electric power, lead to
The resistance detection that conducting wire used in the engineerings such as letter, lightning protection carries out in unit length is exactly an important job.Currently,
There is specialized instrument for the resistance measurement of conducting wire, technologically advanced, precision is higher.But due to not dedicated
Conducting wire stress accommodation, there are large errors with physical length because being bent and distorting the length for causing to measure for conducting wire, based on this
The resistance of conducting wire also correspondingly there will be error in the unit length calculated, thus largely influence power testing result
Fairness, it would therefore be highly desirable to invent a kind of test device of rapid survey conductor resistance to make up deficiency in the prior art.
Utility model content
The technical problems to be solved in the utility model is just to provide a kind of test device of rapid survey conductor resistance, test
Speed is fast, and measuring accuracy is high.
In order to solve the above-mentioned technical problem, the utility model is achieved through the following technical solutions:
A kind of test device of rapid survey conductor resistance, including rack, the rack is equipped with mounting platform plate, described
The left and right both ends of mounting platform plate are symmetrically arranged with two electric current loading mechanisms, and two electric current loading mechanisms are surveyed with D.C. resistance
The current terminal connection of instrument is tried, is symmetrically arranged with Liang Ge voltage measurement mechanism, two voltage measurement machines between two electric current loading mechanisms
It is symmetrically arranged with two supporting mechanisms between structure, sample is placed on supporting mechanism, and the both ends of sample are separately positioned on voltage measurement
In mechanism；It is equipped with loading mechanism fixed plate above Liang Ge voltage measurement mechanism, voltage is installed in loading mechanism fixed plate
Measuring mechanism loading device；Liang Ge voltage measurement mechanism loading device is connect with the voltage measuring terminal of instrument for measuring DC resistance；
The rack side is equipped with operation control portion, the operation control portion and two electric current loading mechanisms, Liang Ge voltage measurement mechanism,
Liang Ge voltage measurement mechanism loading device is all connected with setting.
By using above-mentioned technical proposal, so that voltage measurement point distance is fixed, later period calculating is saved so as to reach
The time of D.C. resistance greatly improves direct current resistance m easurem ent precision and efficiency；And when measurement insulated cable, do not have to remove external insulation
Layer, the sample handling processes before dramatically saving direct current resistance m easurem ent, measurement safety, to people when effectively preventing sample treatment
A possibility that member damages；Support construction plays a supporting role to sample to be tested, effectively avoids sample bent and distortion, reduces
Measurement error improves the accuracy of test result；And voltage measurement mechanism is as sample voltage signal measurement apparatus, also to sample
With clamping action, guarantee that voltage measurement mechanism reliably with the conductive portions contact of sample, then is loaded in voltage measurement mechanism
Under the collective effect of device, the measurement of voltage value is carried out to sample conductor, guarantees the reliable and stable of measurement result.
Preferably, the electric current loading mechanism includes two guide rails being symmetricly set on mounting platform plate, the guide rail
On be equipped with sliding block, be equipped between the sliding block and be connected and fixed plate, be connected and fixed plate side equipped with electric pushrod connecting plate, it is described
It is connected and fixed plate and is equipped with fixed platform, electric current load head is installed, and for determining that electric current adds in the fixed platform
Carry the position feedback device of the relative position of head and sample end.
By using above-mentioned technical proposal, input mechanism of the electric current loading mechanism as sample current signal, when operation, will
Electric pushrod is connect with electric pushrod connecting plate, and the entire mechanism of electric pushrod Work Promote is moved along sliding block with what guide rail formed
Componental movement pushes electric current load head the current-carrying part of sample to, position feedback device is arranged, guarantee electric current load head with
The relative position of swatched end, so that it is guaranteed that measurement is accurate and reliable, it is compact-sized, it is stable and reliable in work.
Preferably, the board bottom portion that is connected and fixed is described equipped with the regulating mechanism for adjusting electric current load bar grease head highness
Regulating mechanism includes that screw thread is arranged in the adjusting screw rod being connected and fixed on plate, and the top of the adjusting screw rod is equipped with operation panel, institute
The bottom for stating adjusting screw rod is fixedly connected with guide rod connecting plate, on the guide rod connecting plate of the adjusting screw rod two sides respectively symmetrically
Equipped with two first guide rods, the first guide rod, which runs through, is connected and fixed plate, and the bottom of the first guide rod is fixed on guide rod company
The upper surface of fishplate bar is fixed on the lower surface of fixed platform at the top of the first guide rod.
By using above-mentioned technical proposal, adjusting screw rod can adjust electric current load according to the variation of sample diameter size
The height of head, it is ensured that the current-carrying part of electric current load head and sample is in reliable contact position, electric pushrod with it is electronic
The connection of push rod connecting plate, pushes entire mechanism to move along the movable part that sliding block is formed with guide rail, and electric current load head is pushed away
To the current-carrying part of sample, when practical operation, rotation process disk, adjusting screw rod is movable in a vertical direction, and drives guide rod connection
Plate is movable in a vertical direction, to drive two first guide rods to be movable in a vertical direction simultaneously, is realized and is loaded head to electric current
Height adjustment.
Preferably, the voltage measurement mechanism includes vertically symmetrically arranged two V-type fixture blocks, two V-type folders
Block one side abuts, and the another side deviated from is equipped with guiding mechanism, and the guiding mechanism close to mounting platform plate is fixed on mounting platform
On plate, the guiding mechanism far from mounting platform plate connects voltage measurement mechanism loading device.
By using above-mentioned technical proposal, voltage measurement mechanism is as sample voltage signal measurement apparatus, by upper and lower two pieces
V-type fixture block clamp sample after, guarantee measurement blade reliably with the conductive portions contact of sample, then the effect in loading device
Under, the insulated part for pushing firm banking to drive measurement knife incision sample stops incision until encountering conductor part after feedback；
Measurement blade has upper and lower two groups, and two groups of blades cut sample simultaneously, when all contact conductor parts, just carries out the survey of voltage value
The reliable and stable of the contact resistance between measurement blade and sample conductor can be effectively ensured in amount in this way.
Preferably, the guiding mechanism includes firm banking, is threaded through firm banking center for connecting the company of V-type fixture block
Connection mechanism is arranged with guide spring on the second guide rod through the second guide rod is equipped on four angles of the firm banking,
Guide spring is connected between V-type fixture block and firm banking, and is fixed on V-type fixture block at the top of the second guide rod, the second guiding
Bar bottom is movably arranged on firm banking by guide bearing.
By using above-mentioned technical proposal, the second guide rod, guide bearing and guide spring composition movable part cooperate work
Make, can be effectively ensured measurement blade it is mobile when and V-block relative position, while blade can be measured in load removal
It can quickly be removed from the insulated part of sample.
Preferably, the supporting mechanism includes fixed bottom plate, and the fixed bottom base plate is solid by connector attachment screw
It is scheduled on mounting platform plate, V-type supporting block is equipped with above the fixed bottom plate, is set between the V-type supporting block and fixed bottom plate
There is buffer gear.
By using above-mentioned technical proposal, supporting mechanism primarily serves the effect of support sample, since sample is more elongated,
If do not supported, sample to be tested middle section is easy to dented, has to the measurement result of D.C. resistance bigger
It influences, therefore, extension supporting mechanism prevents sample to be tested middle section dented, to improve the accuracy of measurement result.
Preferably, the buffer gear includes third guide rod, and the buffer spring being set on third guide rod,
In, third guide rod runs through fixed bottom plate, and the lower surface of V-type supporting block, third guide rod are fixed at the top of third guide rod
Bottom is fixed with limited block, and the buffer spring gear is connected between V-type supporting block and fixed bottom plate.
By using above-mentioned technical proposal, third guide rod, buffer spring and V-type supporting block composition movable part cooperate work
Make, when sample diameter difference can be effectively ensured, automatically adjust the height of supporting mechanism, to guarantee that sample is in horizontal
State.
Preferably, the operation control portion includes the mounting seat being fixedly mounted on the rack, is arranged in mounting seat
Omnidirectional mechanism, the frame on omnidirectional mechanism is set, and the two sides of the frame are respectively equipped with knob, are equipped among the frame
Panel is installed, the installation panel is equipped with man-machine interface and operation button.
By using above-mentioned technical proposal, the maincenter part of operation control portion motion control as a whole, the not only side of needs
Just operator's operation will also guarantee the convenience of sample observation, therefore, by the way that omnidirectional mechanism is arranged, to meet operation control
The movement at the comprehensive no dead angle in portion, meets need of work, and be also provided with knob on frame, it is effective to facilitate operator
It is mobile to hold operation control portion, it is easy to operate.
In conclusion the advantages of the utility model:
1, voltage measurement point distance is fixed, can achieve the time for saving later period calculating D.C. resistance, greatly improves direct current
Resistance measurement precision and efficiency；
2, compared with traditional measurement mode, when the utility model measures insulated cable, without removing external insulation layer and tying up electricity
Site, the sample handling processes before dramatically saving direct current resistance m easurem ent；
3, measurement safety, effectively prevents a possibility that damaging when sample treatment to personnel；
4, support construction plays a supporting role to sample to be tested, effectively avoids sample bent and distortion, reduces measurement error,
Improve the accuracy of test result；
5, voltage measurement mechanism also to sample have clamping action, guarantee voltage measurement mechanism reliably with the conduction of sample
Part contacts, then under the collective effect of voltage measurement mechanism loading device, and the measurement of voltage value is carried out to sample conductor, guarantees
Measurement result it is reliable and stable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram of electric current loading mechanism in the utility model；
Fig. 3 is the main view of electric current loading mechanism in the utility model；
Fig. 4 is the structural schematic diagram of voltage measurement mechanism in the utility model；
Fig. 5 is the main view of voltage measurement mechanism in the utility model；
Fig. 6 is the structural schematic diagram of supporting mechanism in the utility model；
Fig. 7 is the structural schematic diagram of operation control portion in the utility model.
Appended drawing reference:
1, sample；10, rack；11, mounting platform plate；20, electric current loading mechanism；21, guide rail；22, sliding block；23, it connects
Fixed plate；24, fixed platform；25, electric current loads head；26, position feedback device；28, electric pushrod connecting plate；27, it adjusts
Mechanism；271, adjusting screw rod；272, operation panel；273, guide rod connecting plate；274, the first guide rod；30, voltage measurement mechanism；
31, V-type fixture block；32, guiding mechanism；321, firm banking；322, bindiny mechanism；323, the second guide rod；324, guide spring；
325, guide bearing；40, supporting mechanism；41, fixed bottom plate；42, connector；43, V-type supporting block；44, buffer gear；441,
Third guide rod；442, buffer spring；50, voltage measurement mechanism loading device；60, operation control portion；61, mounting seat；62,
Omnidirectional mechanism；63, frame；64, it shakes hands；65, panel is installed；66, man-machine interface；67, operation button.
Specific embodiment
Embodiment:
It is flat to be equipped with installation in rack 10 for a kind of test device of rapid survey conductor resistance, such as Fig. 1, including rack 10
Platen 11 is symmetrically arranged with two electric current loading mechanisms 20, two electric current loading mechanisms 20 at the left and right both ends of mounting platform plate 11
It is connect with the current terminal of instrument for measuring DC resistance, Liang Ge voltage measurement mechanism is symmetrically arranged between two electric current loading mechanisms 20
30, and two supporting mechanisms 40 are symmetrically arranged between Liang Ge voltage measurement mechanism 30, sample 1 is placed on supporting mechanism 40, and
The both ends of sample 1 are separately positioned in voltage measurement mechanism 30；Loading mechanism is equipped with above Liang Ge voltage measurement mechanism 30
Fixed plate is equipped with voltage measurement mechanism loading device 50 in loading mechanism fixed plate；Liang Ge voltage measurement mechanism loading device
50 connect with the voltage measuring terminal of instrument for measuring DC resistance；Operation control portion 60, operation control portion are equipped in 10 side of rack
60 are all connected with and set with two electric current loading mechanisms 20, Liang Ge voltage measurement mechanism 30, Liang Ge voltage measurement mechanism loading device 50
It sets.
Such as Fig. 2, electric current loading mechanism 20 includes two guide rails 21 being symmetricly set on mounting platform plate 11, on guide rail 21
It is equipped with sliding block 22, is equipped between sliding block 22 and is connected and fixed plate 23,23 side of plate is connected and fixed and is equipped with electric pushrod connecting plate 28,
It is connected and fixed plate 23 and is equipped with fixed platform 24, electric current load head 25 is installed, and for determining electricity in fixed platform 24
The position feedback device 26 of the relative position at stream load head 25 and 1 end of sample.
Such as Fig. 3, it is connected and fixed 23 bottom of plate and is equipped with the regulating mechanism 27 for loading 25 height of head for adjusting electric current, adjust
Mechanism 27 includes that screw thread is arranged in the adjusting screw rod 271 being connected and fixed on plate 23, wherein the top of adjusting screw rod 271 is equipped with behaviour
Make disk 272, the bottom of adjusting screw rod 271 is fixedly connected with guide rod connecting plate 273, the guide rod connection of 271 two sides of adjusting screw rod
Two first guide rods 274 are respectively symmetrically equipped on plate 273, the first guide rod 274, which runs through, is connected and fixed plate 23, and the first guiding
The bottom of bar 274 is fixed on the upper surface of guide rod connecting plate 273, and the top of the first guide rod 274 is fixed on fixed platform 24
Lower surface.
When rotation process disk 272, adjusting screw rod 271 is movable in a vertical direction, and drives guide rod connecting plate 273 along Vertical Square
To movement, to drive two first guide rods 274 to be movable in a vertical direction simultaneously, the height to electric current load head 25 is realized
It adjusts.
Such as Fig. 4, voltage measurement mechanism 30 includes vertically symmetrically arranged two V-type fixture blocks 31, two V-type fixture blocks
31 one sides abut, and the another side deviated from is equipped with guiding mechanism 32, wherein the guiding mechanism 32 close to mounting platform plate 11 is fixed
On mounting platform plate 11, the guiding mechanism 32 far from mounting platform plate 11 connects voltage measurement mechanism loading device 50.
Such as Fig. 5, guiding mechanism 32 includes firm banking 321, is threaded through 321 center of firm banking for connecting V-type fixture block
31 bindiny mechanism 322, through being equipped with the second guide rod 323 on four angles of firm banking 321, on the second guide rod 323
It is arranged with guide spring 324, guide spring 324 is connected between V-type fixture block 31 and firm banking 321, and the second guide rod 323
Top is fixed on V-type fixture block 31, and 323 bottom of the second guide rod is movably arranged on firm banking 321 by guide bearing 325
On.
Such as Fig. 6, supporting mechanism 40 includes fixed bottom plate 41, and fixed 41 bottom of bottom plate is fixed by 42 attachment screw of connector
On mounting platform plate 11, it is equipped with V-type supporting block 43 above fixed bottom plate 41, is set between V-type supporting block 43 and fixed bottom plate 41
There is buffer gear 44.
Buffer gear 44 includes third guide rod 441, and the buffer spring 442 being set on third guide rod 441,
In, third guide rod 441 runs through fixed bottom plate 41, and the lower surface of V-type supporting block 43 is fixed at the top of third guide rod 441,
441 bottom of third guide rod is fixed with limited block, and the gear of buffer spring 442 is connected between V-type supporting block 43 and fixed bottom plate 41.
Such as Fig. 7, operation control portion 60 includes the mounting seat 61 being fixedly mounted in rack 10, is arranged in mounting seat 61
On omnidirectional mechanism 62, the frame 63 on omnidirectional mechanism 62 is set, and the two sides of frame 63 are respectively equipped with knob 64, in frame 63
Between be equipped with installation panel 65, installation panel 65 be equipped with man-machine interface 66 and operation button 67.
The maincenter part of operation control portion motion control as a whole, not only needs to facilitate operator's operation, also to protect
The convenience of sample observation is demonstrate,proved, therefore, by the way that omnidirectional mechanism is arranged, to meet the movement at the comprehensive no dead angle of operation control portion,
Meet need of work, and be also provided with knob 64 on frame 63, facilitates operator and effectively hold operation control portion shifting
It is dynamic, it is easy to operate.
Basic functional principle: when carrying out the test of 1 D.C. resistances of samples such as wire and cable, aerial insulated cable, first from original
The sample 1 that 1.4 meters of length or so is taken at material, sample 1 is placed on supporting mechanism 40 and voltage measurement mechanism 30, control electricity
The electric current load head 25 of stream loading mechanism 20 and the both ends of sample 1 come into full contact with, electric current loading mechanism 20 and D.C. resistance
The current terminal of tester connects；50 driving voltage measuring mechanism 30 of voltage measurement mechanism loading device, voltage measurement are controlled later
In voltage measurement blade incision sample introduction product 1 in mechanism 30, until with the conductive portions contact of sample 1, voltage measurement machine
Structure 30 is connect with the voltage measuring terminal of direct current resistance measurer；After the operation for completing two step of front, so that it may carry out the sample 1
Direct current resistance m easurem ent, test speed is fast, and measuring accuracy is high.
The utility model is suitable for rapid survey voltage rating 1KV to 35KV extrusion insulating power cable, voltage rating
10KV makes somebody a mere figurehead the D.C. resistance of the conductors such as edge rolling cable, voltage rating 1KV and following aerial insulated cable.
In addition to above preferred embodiment, for the utility model there are also other embodiments, those skilled in the art can root
It is made various changes and modifications according to the utility model, without departing from the spirit of the utility model, should belong to the utility model
Range defined in appended claims.
Claims (8)
1. a kind of test device of rapid survey conductor resistance, it is characterised in that: including rack, it is flat that the rack is equipped with installation
Platen, the left and right both ends of the mounting platform plate are symmetrically arranged with two electric current loading mechanisms, and two electric current loading mechanisms are and directly
The current terminal of leakage resistance tester connects, and is symmetrically arranged with Liang Ge voltage measurement mechanism, two electricity between two electric current loading mechanisms
Two supporting mechanisms are symmetrically arranged between pressure measuring mechanism, sample are placed on supporting mechanism, and the both ends of sample are separately positioned on
In voltage measurement mechanism；It is equipped with loading mechanism fixed plate above Liang Ge voltage measurement mechanism, pacifies in loading mechanism fixed plate
Equipped with voltage measurement mechanism loading device；Liang Ge voltage measurement mechanism loading device with the voltage measurement of instrument for measuring DC resistance
End connection；The rack side is equipped with operation control portion, and the operation control portion and two electric current loading mechanisms, two voltages are surveyed
Measuring mechanism, Liang Ge voltage measurement mechanism loading device are all connected with setting.
2. a kind of test device of rapid survey conductor resistance according to claim 1, it is characterised in that: the electric current adds
Mounted mechanism includes two guide rails being symmetricly set on mounting platform plate, is equipped with sliding block on the guide rail, between the sliding block
Equipped with plate is connected and fixed, plate side is connected and fixed equipped with electric pushrod connecting plate, the plate that is connected and fixed is equipped with fixed platform,
Electric current load head is installed in the fixed platform, and the relative position for determining electric current load head and sample end
Position feedback device.
3. a kind of test device of rapid survey conductor resistance according to claim 2, it is characterised in that: the connection is solid
Fixed board bottom is equipped with the regulating mechanism for adjusting electric current load bar grease head highness, and the regulating mechanism includes that screw thread is arranged in connection
The top of adjusting screw rod in fixed plate, the adjusting screw rod is equipped with operation panel, and the bottom of the adjusting screw rod, which is fixedly connected, leads
To bar connecting plate, two first guide rods are respectively symmetrically equipped on the guide rod connecting plate of the adjusting screw rod two sides, first leads
Run through to bar and be connected and fixed plate, and the bottom of the first guide rod is fixed on the upper surface of guide rod connecting plate, the first guide rod
Top is fixed on the lower surface of fixed platform.
4. a kind of test device of rapid survey conductor resistance according to claim 1-3, it is characterised in that: institute
Stating voltage measurement mechanism includes vertically symmetrically arranged two V-type fixture blocks, and two V-type fixture block one sides abut, deviate from
Another side is equipped with guiding mechanism, and the guiding mechanism close to mounting platform plate is fixed on mounting platform plate, far from mounting platform
The guiding mechanism of plate connects voltage measurement mechanism loading device.
5. a kind of test device of rapid survey conductor resistance according to claim 4, it is characterised in that: the Guiding machine
Structure includes firm banking, is threaded through firm banking center for connecting the bindiny mechanism of V-type fixture block, and four of the firm banking
Through the second guide rod is equipped on angle, guide spring is arranged on the second guide rod, guide spring is connected to V-type fixture block and consolidates
Determine between pedestal, and be fixed on V-type fixture block at the top of the second guide rod, the second guide rod bottom is arranged by guide bearing activity
On the fixed base.
6. a kind of test device of rapid survey conductor resistance according to claim 1, it is characterised in that: the support machine
Structure includes fixed bottom plate, and the fixed bottom base plate is fixed on mounting platform plate by connector attachment screw, the fixation
It is equipped with V-type supporting block above bottom plate, is equipped with buffer gear between the V-type supporting block and fixed bottom plate.
7. a kind of test device of rapid survey conductor resistance according to claim 6, it is characterised in that: the buffer
Structure includes third guide rod, and the buffer spring being set on third guide rod, wherein third guide rod runs through fixed bottom
Plate, and the lower surface of V-type supporting block is fixed at the top of third guide rod, third guide rod bottom is fixed with limited block, described
Buffer spring gear is connected between V-type supporting block and fixed bottom plate.
8. a kind of test device of rapid survey conductor resistance according to claim 1, it is characterised in that: the operation control
Portion processed includes the mounting seat being fixedly mounted on the rack, and the omnidirectional mechanism in mounting seat is arranged in, and is arranged in omnidirectional mechanism
On frame, the two sides of the frame are respectively equipped with knob, installation panel are equipped among the frame, is set on the installation panel
There are man-machine interface and operation button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821055605.0U CN208383987U (en) | 2018-07-04 | 2018-07-04 | A kind of test device of rapid survey conductor resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821055605.0U CN208383987U (en) | 2018-07-04 | 2018-07-04 | A kind of test device of rapid survey conductor resistance |
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| Publication Number | Publication Date |
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| CN208383987U true CN208383987U (en) | 2019-01-15 |
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ID=64963800
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821055605.0U Active CN208383987U (en) | 2018-07-04 | 2018-07-04 | A kind of test device of rapid survey conductor resistance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320408A (en) * | 2019-07-31 | 2019-10-11 | 贵州振华华联电子有限公司 | A kind of Miniature rotary switch measuring contact resistance device |
-
2018
- 2018-07-04 CN CN201821055605.0U patent/CN208383987U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320408A (en) * | 2019-07-31 | 2019-10-11 | 贵州振华华联电子有限公司 | A kind of Miniature rotary switch measuring contact resistance device |
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