CN113680925A - Sensitive component testing system of protective relay - Google Patents
Sensitive component testing system of protective relay Download PDFInfo
- Publication number
- CN113680925A CN113680925A CN202110832465.3A CN202110832465A CN113680925A CN 113680925 A CN113680925 A CN 113680925A CN 202110832465 A CN202110832465 A CN 202110832465A CN 113680925 A CN113680925 A CN 113680925A
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- sensitive component
- groove
- protective relay
- testing
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- 230000001681 protective effect Effects 0.000 title claims abstract description 16
- 210000000078 claw Anatomy 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims description 21
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 244000208734 Pisonia aculeata Species 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims 3
- 241001330002 Bambuseae Species 0.000 claims 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 3
- 239000011425 bamboo Substances 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 11
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 description 9
- 238000005452 bending Methods 0.000 description 6
- 230000003139 buffering effect Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F1/00—Bending wire other than coiling; Straightening wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a sensitive component testing system of a protective relay, which structurally comprises a motor, a retaining plate, a holding layer, a stop block, a blanking rod and lifting columns, wherein the retaining plate is connected with two sides of the motor through the lifting columns, and is provided with a stop block, the restraint plate is connected with a draw-in layer and a blanking rod, the stop block comprises a side bearing platform, a sliding plate, a through groove, a positioning claw and a connecting plate, the bottom of the side bearing platform is in sliding fit with the motor through the sliding plate and is connected with the connecting plate, the connecting plate is connected with the through groove, the positioning claw is arranged in the through groove, the positioning claw is provided with a coupling device and a pressure-transferring structure which are matched with the bag cover, when the downward guide wire rod of unloading pole constantly twines to the device outside, will carry out syntropy tensioning along carrying the edge of antithetical couplet device and draw, rethread commentaries on classics pressure structure turns to and gathers together side by side, guarantees the edge rolling effect of wire rod.
Description
Technical Field
The invention relates to the field of sensitive components, in particular to a sensitive component testing system of a protective relay.
Background
The overcurrent and ground protection relay series clamping piece is an important clamping piece for circuit protection of a nuclear power station, is mainly used in a radiation type power grid which is directly grounded, resistance-grounded or impedance-grounded in a power system, and comprises a power supply board, a mainboard and a relay board, wherein the mainboard and the relay board are provided with components which play a main role in overcurrent protection of the relay, sensitive components such as a capacitor, a relay, a current transformer and the like, and when a wire outside the device is coiled, in order to tighten the coiling circle, the semicircle or the arc with any angle of the wire outside the device, the traditional sensitive component testing system for the protection relay can utilize the downward guide of a blanking rod to be continuously intertwined outside the device to change the diameter of the device so that the condition of contact overlapping of adjacent wires occurs, and the tensioning strength of the wire after the coiling of the wire is weak, the adjacent wires are loosened and wound disorderly and even extend out of the equipment body in a curved roll shape, and the wire rolling effect is reduced.
Disclosure of Invention
Aiming at the problems, the invention provides a sensitive component testing system of a protective relay, which structurally comprises a motor, a retaining plate, a holding layer, a stop block, a blanking rod and a lifting column, wherein the retaining plate is connected to two sides of the motor through the lifting column and provided with the stop block, the holding layer and the blanking rod are connected to the retaining plate, the stop block comprises a side bearing platform, a sliding plate, a through groove, a positioning claw and a connecting plate, the bottom of the side bearing platform is in sliding fit with the motor through the sliding plate and is connected with the connecting plate, the connecting plate is connected with the through groove, and the positioning claw is arranged in the through groove.
As a further improvement of the invention, the positioning claw comprises a transition turntable, a carrying device, a rotating and pressing structure, a bag cover, a supporting plate and a bullet, wherein the transition turntable is connected in the through groove and is connected with the supporting plate, the supporting plate is connected with the bullet, the bullet is in transition fit on the carrying device, and the carrying device is indirectly fit on the rotating and pressing structure through the bag cover.
As a further improvement of the invention, the bag cover is movably clamped with the transition turntable and indirectly matched in the through groove to indirectly guide the movement direction of the carrying device, so that the installation stability can be ensured.
As a further improvement of the invention, the carrying device comprises a pressing shaft, an insertion cylinder, a top shoulder, a separation hook and a clamping rod, wherein the pressing shaft is rotatably matched between the clamping rods, the clamping rod is connected in the insertion cylinder, and the insertion cylinder is connected to the separation hook and indirectly matched with the top shoulder.
As a further improvement of the invention, the separation hook is in transition fit with the warhead and is connected to the covering cover, so that the rolled wire can be effectively guided to be tensioned and shaped, and the advancing direction of the separation hook is restrained.
As a further improvement of the invention, the top shoulder comprises a rubber ring, a reinforcing groove, a ball, a running-in layer and a sheath, wherein the rubber ring is connected to the running-in layer and connected with the reinforcing groove, the running-in layer is connected to the isolating hook through the sheath, and the ball is matched in the reinforcing groove in a rolling manner.
As a further improvement of the invention, the pressure-transferring structure comprises a cross cavity, a guide way, an inclined strut, an auxiliary part and a traction wire, wherein the cross cavity is connected in the transition turntable and is connected with the traction wire, the traction wire is connected with the guide way, a pressure shaft is matched on the guide way in a rolling way, and the auxiliary part is arranged between the guide way and the guide way through the inclined strut.
As a further improvement of the invention, the auxiliary part comprises a filling pad, a pull-back rope, a round cover, swing pieces and an adapter, wherein the filling pad is connected in the round cover, the round cover is in transition fit between the swing pieces through the pull-back rope, the swing pieces are connected on the adapter and are in sliding fit in the inclined strut through the round cover, and the adapter is connected on the cross cavity.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
1. according to the wire rod rounding device, the positioning claw is provided with the coupling device and the pressure rotating structure, the coupling device and the pressure rotating structure are matched with the air bag cover, when the wire rod is guided downwards by the blanking rod to be continuously intertwined to the outside of a device, the wire rod is tensioned and pulled in the same direction along the edge of the coupling device, and then the wire rod is turned and gathered side by side through the pressure rotating structure, so that the wire rod rounding effect is ensured.
2. The ball effectively reduces the resistance of the bearing wire rod sliding on the grinding layer, so that the grinding layer can bear the pressure of the wire rod to form an inner arc bending moment tensioning effect, the force of the wire rod bouncing and rolling is conveniently absorbed, and an effective buffering effect is achieved.
3. The guide channel penetrates and slides in the bag cover, and the upper surface of the guide channel is of a stripe structure, so that the rolling extrusion of the pressing shaft is conveniently carried out, the space gap reservation effect when the pressing shaft presses downwards is realized, the buffering of the inertia acting force is ensured, and the coplanarity between the pressing shaft and the pressing shaft is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a sensitive component testing system of a protective relay according to the present invention.
Fig. 2 is a schematic plan view of the stopper of the present invention.
FIG. 3 is a schematic cross-sectional view of the positioning pawl of the present invention.
Fig. 4 is a schematic plan view of a portable device according to the present invention.
FIG. 5 is a side view of the shoulder of the present invention.
Fig. 6 is a schematic plan view of the pressure transfer structure of the present invention.
Fig. 7 is a schematic plan view of the auxiliary member of the present invention.
In the figure: motor-1, plate-2, bracket-3, block-4, blanking rod-5, lifting column-6, side bearing platform-41, slide plate-42, through groove-43, positioning claw-44, joint plate-45, transition rotary disc-441, carrying device-442, rotary-pressing structure-443, capsule-cover-444, support plate-445, bullet-446, press shaft-2 a1, insert cylinder-2 a2, top shoulder-2 a3, separating hook-2 a4, clamping rod-2 a5, rubber ring-a 31, reinforced groove-a 32, ball-a 33, grinding layer-a 34, sheath-a 35, cross cavity-3 b1, guide channel-3 b2, inclined bracket-3 b3, auxiliary piece-3 b4, traction line-3 b5, filling pad-b 41, A pull back rope-b 42, a round cover-b 43, a swinging piece-b 44 and an adapter-b 45.
Detailed Description
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-3, the invention provides a sensitive component testing system of a protective relay, which structurally comprises a motor 1, a retaining plate 2, a stopper layer 3, a stopper 4, a blanking rod 5, and a lifting column 6, wherein both sides of the motor 1 are hinged to the retaining plate 2 through the lifting column 6, the stopper 4 is disposed at the top, the inner side of the retaining plate 2 is fixedly connected with the retaining layer 3 and the blanking rod 5, the stopper 4 comprises a side bearing platform 41, a sliding plate 42, a through groove 43, a positioning claw 44, and a connecting plate 45, the bottom of the side bearing platform 41 is slidably fitted on the motor 1 through the sliding plate 42, the top is fixedly connected with the connecting plate 45, the through groove 43 is welded on the connecting plate 45, the positioning claw 44 is disposed in the through groove 43, the positioning claw 44 comprises a transition turntable 441, a carrying device 442, a pressure structure 443, a bag cover 444, a support plate 445, and a bullet head 446, the transition turntable is connected in the through groove 43, and the bottom fixedly connected with backup pad 445, the scarf joint is connected with warhead 446 on the backup pad 445, warhead 446 transition fit is on taking antithetical couplet device 442, take antithetical couplet device 442 through bag draw the cover 444 and cooperate in the commentaries on classics pressure structure 443 inboard indirectly, bag draw the cover 444 for crescent structure, its arc incision and transition carousel 441 activity block, and cooperate in leading the direction of motion of antithetical couplet device 442 indirectly, can guarantee to install stably, be provided with on locating pawl 44 and take antithetical couplet device 442 and turn pressure structure 443, utilize and take antithetical couplet device 442 and turn pressure structure 443 and draw the cover 444 cooperation of bag, when the downward guide wire rod of unloading pole 5 is constantly entangled to the device outside, will carry out syntropy taut traction along taking antithetical couplet device 442 edge, the rethread structure 443 turns to and returns and gathers up side by side, guarantees the effect of curling of wire.
Example 2
As shown in fig. 4-7, on the basis of embodiment 1, the invention combines the mutual cooperation of the following structural components, the carrying device 442 includes a pressing shaft 2a1, an inserting cylinder 2a2, a top shoulder 2a3, a separating hook 2a4, a clamping rod 2a5, the pressing shaft 2a1 is rotationally fitted between the clamping rods 2a5, the clamping rod 2a5 is inserted and embedded in the inserting cylinder 2a2, the inserting cylinder 2a2 is fixedly connected to the bottom of the separating hook 2a4 and indirectly fitted with the top shoulder 2a3, the separating hook 2a4 is transitionally fitted on the bullet head 446 at two sides in an arc shape and is sleeved on the back of a cover 444 at a bend, which can effectively guide the tightening setting of the coiled wire and restrict the traveling direction of the separating hook 2a4, the top shoulder 2a3 includes a31, a strengthening groove a5, a33, a wear-on a layer 34, a jacket 24 a31 a, a 599 a strengthening groove 31 is connected with a 599 and 31 a stiffening groove 599 is connected with a wear-on two sides, the grinding layer a34 is connected to the bent part of the separating hook 2a4 in a sleeved mode through a sheath a35, a ball a33 is matched with the inner circumference of the transition turntable 441 in a rolling mode in the reinforcing groove a32, the rolling structure 443 comprises a cross cavity 3b1, a guide channel 3b2, a cross bracket 3b3, an auxiliary piece 3b4 and a pull line 3b5, the cross cavity 3b1 is an equilateral triangle structure and is connected in the transition turntable 441 in a welded mode, the edge of the cross cavity is connected with the pull line 3b5 in a welded mode, the pull line 3b5 is fixedly connected with the guide channel 3b5 in an inclined mode, the guide channel 3b5 is matched with the pressing shaft 2a5 in a rolling mode, the auxiliary piece 3b5 is arranged between the guide channel and the guide channel 3b5 through the cross bracket 3b5, the auxiliary piece 3b5 comprises a filling pad b5, a pull rope b5, a circular cover b5, a swing piece b5 is fixedly connected between the circular cover b5, the circular cover b5 is matched with the swing piece b5 through the pull rope 5, swing piece b44 is articulated to be connected on adapter b45, and in the sloping frame 3b3 through dome b43 sliding fit, adapter b45 welded connection is on alternately chamber 3b1, because of ball a33 has effectively reduced the resistance of accepting the wire rod and sliding in running-in layer a34, make running-in layer a34 can accept the wire rod pressure and form inner arc bending moment tensioning effect, be convenient for absorb the power that the wire rod flicked the edge rolling, reach effectual cushioning effect, pass through the guide way 3b2 and alternate the slip in including the cover 444, and the upper surface is the stripe structure, be convenient for in proper position accept the roll extrusion of last shaft 2a1, space gap reservation effect when realizing last shaft 2a1 pushes down, the buffering of guarantee inertia effort, the coplanarity between the assurance.
The following is a description of the working principle of the sensitive component testing system of the protective relay in the above technical solution:
in the invention, when the wire rod is rolled outside the device in use, in order to avoid the condition that adjacent wire rods are overlapped in a contact manner due to the downward guiding of the blanking rod 5, a positioning claw 44 is arranged in the through groove 43, the rolled wire rod is continuously rolled between the top shoulders 2a3 through the ball a33 in the reinforcing groove a32 and is guided to be driven to the plane of the rubber ring a31 by virtue of the mutual friction force, the rubber ring a31 is positioned at the highest position of the grinding layer a34 and can be matched with the sheath a35 to intensively shake and flatten the rolled wire rod at the bending position of the separation hook 2a4 and pull and arrange the rolled wire rod on the grinding layer a34 in a pulling manner, meanwhile, the tip of the separation hook 2a4 is pushed to penetrate into the inside of the cross cavity 3b1 through the bottom of the guide channel 3b2 to ensure that the wire rod and the wire rod can mutually abut against each other, so that the separation hook 2a4 is forced to drive the bag cover 444 to sink and slide at the edge of the guide channel 3b2, the pressing shaft 2a1 is matched with the clamping roller 2a5 to face the wire flowing direction to smoothly roll and join to the stripe structure of the guide way 3b2, and the wires on the grinding layer a34 are further pushed to the inclined bracket 3b3 in parallel, so that when one side of the separation hook 2a4 rotates and is extruded to the bending part of the inclined bracket 3b3, the other separation hook 2a4 is limited by the bullet 446, the pressing shaft 2a1 can be guaranteed to roll to the 90-degree bending part of the inclined bracket 3b3, the inclined bracket 3b3 is stretched and deformed, the angle of the bending part is changed, the swinging piece b44 in the same plane can be guided to drive the wires carried by the round cover b43 to press towards the deformation direction of the inclined bracket 3b3 by taking the adapter b45 as a fulcrum in parallel, and the wires are gathered and butted together, and the tensioning strength after the wire is flexibly controlled to be rolled.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "side," and the like, as used herein, are used in an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Claims (8)
1. A sensitive component test system of a protective relay is characterized in that: its structure includes motor (1), is restricted board (2), includes layer (3), dog (4), unloading pole (5), lifts post (6), motor (1) both sides are connected with through lifting post (6) and are restricted board (2), and are provided with dog (4), be connected with on restricting board (2) and draw together layer (3) and unloading pole (5), dog (4) are including side cushion cap (41), slide (42), logical groove (43), positioning pawl (44), link up board (45), slide (42) sliding fit is passed through on motor (1) in side cushion cap (41) bottom, and is connected with link up board (45), be connected with logical groove (43) on link up board (45), be provided with positioning pawl (44) in logical groove (43).
2. The system for testing the sensitive component of the protective relay according to claim 1, wherein: the positioning claw (44) comprises a transition turntable (441), a carrying-connecting device (442), a rotary pressing structure (443), a bag-included cover (444), a support plate (445) and a bullet (446), wherein the transition turntable (441) is connected in the through groove (43) and is connected with the support plate (445), the support plate (445) is connected with the bullet (446), the bullet (446) is in transition fit on the carrying-connecting device (442), and the carrying-connecting device (442) is indirectly matched with the rotary pressing structure (443) through the bag-included cover (444).
3. The system for testing the sensitive component of the protective relay according to claim 2, wherein: the bag cover (444) is movably clamped with the transition rotary disc (441) and is indirectly matched in the through groove (43).
4. The system for testing the sensitive component of the protective relay according to claim 2, wherein: carry and ally oneself with device (442) including pressing axle (2a1), insert a section of thick bamboo (2a2), top shoulder (2a3), separate hook (2a4), press from both sides rod (2a5), press axle (2a1) normal running fit between pressing rod (2a5), press from both sides rod (2a5) to connect in inserting a section of thick bamboo (2a2), insert a section of thick bamboo (2a2) and connect on separating hook (2a4), and with top shoulder (2a3) indirect cooperation together.
5. The system for testing the sensitive component of the protective relay according to claim 4, wherein: the separating hook (2a4) is in transition fit with the bullet head (446) and is connected to the bag cover (444).
6. The system for testing the sensitive component of the protective relay according to claim 4, wherein: the top shoulder (2a3) comprises a rubber ring (a31), a reinforcing groove (a32), a ball (a33), a running-in layer (a34) and a jacket (a35), wherein the rubber ring (a31) is connected to the running-in layer (a34) and connected with the reinforcing groove (a32), the running-in layer (a34) is connected to the separating hook (2a4) through the jacket (a35), and the ball (a33) is matched in the reinforcing groove (a32) in a rolling mode.
7. The system for testing the sensitive component of the protective relay according to claim 2, characterized in that: the rotary pressing structure (443) comprises a cross cavity (3b1), a guide way (3b2), an inclined bracket (3b3), an auxiliary part (3b4) and a traction line (3b5), wherein the cross cavity (3b1) is connected in the transition turntable (441) and is connected with the traction line (3b5), the traction line (3b5) is connected with the guide way (3b2), a pressing shaft (2a1) is matched on the guide way (3b2) in a rolling mode, and the auxiliary part (3b4) is arranged between the guide way and the guide way through the inclined bracket (3b 3).
8. The system for testing the sensitive component of the protective relay according to claim 7, wherein: the auxiliary piece (3b4) comprises a filling pad (b41), a pull-back rope (b42), a round cover (b43), a swinging piece (b44) and an adapter (b45), wherein the filling pad (b41) is connected in the round cover (b43), the round cover (b43) is in transition fit between the swinging pieces (b44) through a pull-back rope (b42), the swinging pieces (b44) are connected on the adapter (b45) and are in sliding fit in a diagonal frame (3b3) through the round cover (b43), and the adapter (b45) is connected on a cross cavity (3b 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110832465.3A CN113680925A (en) | 2021-07-22 | 2021-07-22 | Sensitive component testing system of protective relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110832465.3A CN113680925A (en) | 2021-07-22 | 2021-07-22 | Sensitive component testing system of protective relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113680925A true CN113680925A (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110832465.3A Pending CN113680925A (en) | 2021-07-22 | 2021-07-22 | Sensitive component testing system of protective relay |
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| Country | Link |
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| CN (1) | CN113680925A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131119A (en) * | 1990-07-03 | 1992-07-21 | Yoshida Kogyo K.K. | Hook structure for integrally molded surface fastener |
| CN103503083A (en) * | 2011-10-27 | 2014-01-08 | 住友电装株式会社 | Wire-length-adjusting device provided with wire replacement mechanism |
| CN107128716A (en) * | 2017-06-16 | 2017-09-05 | 太仓鸿海精密机械有限公司 | A kind of coiler device |
| CN207415603U (en) * | 2017-11-16 | 2018-05-29 | 福建和其祖林业科技有限公司 | A kind of artificial plate trimming device with saw plate vehicle |
| CN113012878A (en) * | 2021-02-26 | 2021-06-22 | 南京留隍臣商贸有限公司 | Resistor with high stability |
-
2021
- 2021-07-22 CN CN202110832465.3A patent/CN113680925A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131119A (en) * | 1990-07-03 | 1992-07-21 | Yoshida Kogyo K.K. | Hook structure for integrally molded surface fastener |
| CN103503083A (en) * | 2011-10-27 | 2014-01-08 | 住友电装株式会社 | Wire-length-adjusting device provided with wire replacement mechanism |
| EP2772925A1 (en) * | 2011-10-27 | 2014-09-03 | Sumitomo Wiring Systems, Ltd. | Wire-length-adjusting device provided with wire replacement mechanism |
| CN107128716A (en) * | 2017-06-16 | 2017-09-05 | 太仓鸿海精密机械有限公司 | A kind of coiler device |
| CN207415603U (en) * | 2017-11-16 | 2018-05-29 | 福建和其祖林业科技有限公司 | A kind of artificial plate trimming device with saw plate vehicle |
| CN113012878A (en) * | 2021-02-26 | 2021-06-22 | 南京留隍臣商贸有限公司 | Resistor with high stability |
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Application publication date: 20211123 |
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