CN114245051A - Intermediate frequency attenuator improves device convenient to operation - Google Patents
Intermediate frequency attenuator improves device convenient to operation Download PDFInfo
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- CN114245051A CN114245051A CN202111558809.2A CN202111558809A CN114245051A CN 114245051 A CN114245051 A CN 114245051A CN 202111558809 A CN202111558809 A CN 202111558809A CN 114245051 A CN114245051 A CN 114245051A
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- threaded rod
- intermediate frequency
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- frequency attenuator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
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Abstract
The invention discloses an intermediate frequency attenuator improving device convenient to operate, and particularly relates to the technical field of use of intermediate frequency attenuators, wherein the intermediate frequency attenuator improving device comprises a box body and a first fixing plate, and is characterized in that: corner fixed mounting on first fixed plate top has first slide bar, the top fixed mounting of first slide bar has first limiting plate, the surface sliding connection of first slide bar has the mounting bracket, the inside fixed mounting of mounting bracket has the second fixed plate, the central point department of putting of one side on first fixed plate top rotates and is connected with first threaded rod, the inside central point department of putting of mounting bracket top one side fixed mounting has first screw thread section of thick bamboo, first threaded rod and first screw thread section of thick bamboo threaded connection, rotate first threaded rod, the mounting bracket carries out the removal from top to bottom under the interact of the first screw thread section of thick bamboo in inside and first threaded rod, first slide bar carries out spacing effect for the mounting bracket at the interactive in-process of mounting bracket, prevent that the mounting bracket from rotating along with the rotation of first threaded rod.
Description
Technical Field
The invention relates to the technical field of use of intermediate frequency attenuators, in particular to an improved device of an intermediate frequency attenuator, which is convenient to operate.
Background
An intermediate frequency attenuator, an attenuator for attenuating the amplitude of the intermediate frequency of a first audio signal to a value below a desired value, which is connected to an image amplifier in order to avoid mutual interference between the image and the audio signal in a television of an internal carrier receiving system, is mainly used for: adjusting the size of a signal in the circuit; in the comparison method measuring circuit, the attenuation value of the measured network can be directly read; the impedance matching is improved, if some circuits require a relatively stable load impedance, an attenuator can be inserted between the circuit and the actual load impedance, so as to buffer the impedance change, and the prior art intermediate frequency attenuator improving device which is convenient to operate has the following problems:
1. the existing intermediate frequency attenuator is installed inside a carrier and then used, the existing internal structure for loading the intermediate frequency attenuator is fixed, when the intermediate frequency attenuator is used, a worker needs to stretch a hand into the carrier to take the intermediate frequency attenuator, and then the intermediate frequency attenuator can work by virtue of a fixing device, the intermediate frequency attenuator is likely to slide off in the taking process, or the worker stretches the hand into the carrier to operate the intermediate frequency attenuator, so that the intermediate frequency attenuator is inconvenient to operate;
2. the carriers which can be stretched can only be extended in a single direction and cannot be adjusted according to actual conditions, a sliding block is mostly arranged in the carriers, and the carriers cannot be fixed when used on uneven ground, and most of the carriers are manually intervened in a fixing mode, so that the operation of the intermediate frequency attenuator is influenced; to this end, we propose an improved device of the intermediate frequency attenuator, which is easy to operate, to solve the above problems.
Disclosure of Invention
The present invention is directed to an improved apparatus for an intermediate frequency attenuator, which is easy to operate, and solves the above-mentioned problems of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an intermediate frequency attenuator improves device convenient to operation, includes box body and first fixed plate, the edge fixed mounting on first fixed plate top has first slide bar, the top fixed mounting of first slide bar has first limiting plate, the surface sliding connection of first slide bar has the mounting bracket, the inside fixed mounting of mounting bracket has the second fixed plate, the central point of one side on first fixed plate top puts the department and rotates and is connected with first threaded rod, the inside central point of mounting bracket top one side puts a fixed mounting and has a screw thread section of thick bamboo, a first threaded rod and a screw thread section of thick bamboo threaded connection.
Preferably, a cross groove is formed in the second fixing plate, a cross sliding block is symmetrically and slidably connected to the inside of the cross groove, a second threaded rod is fixedly mounted at one end of the cross sliding block, a second threaded cylinder is mounted on the radial outer wall of the second threaded rod through matching of inner threads and outer threads, clamping plates are fixedly mounted at the top ends of the cross sliding block, one of the clamping plates is fixedly mounted on the inner wall of the clamping plate in a symmetrical mode, and inserting grooves are symmetrically formed in the inner wall of the clamping plate.
Preferably, the circular slot has been seted up to the inside of box body bottom, a plurality of draw-in groove has been seted up to the inner wall of circular slot, the inside rotation of circular slot is connected with the carousel, the first spout of a plurality of has been seted up to the inside of carousel, the inside fixed mounting of first spout has first spring, the one end fixed mounting of first spring has the flexible piece.
Preferably, the top end of the rotary table is symmetrically and fixedly provided with guide rails, guide grooves are formed in the guide rails, a second slide bar is connected to the inside of each guide groove in a sliding mode, and supporting blocks are fixedly arranged on one side of the top end of the second slide bar.
Preferably, one side fixed mounting that carousel top central point put department has first fixed block, first thread groove has been seted up to the inside of first fixed block, the inside threaded connection of first thread groove has the third threaded rod, the surperficial threaded connection of third threaded rod has the screw thread slider.
Preferably, first rotating groove has been seted up to the bilateral symmetry of box body bottom, the inside rotation in first rotating groove is connected with first rotating turret, the top fixed mounting of first rotating turret has first riser, the second rotating groove has been seted up to the adjacent both sides in first rotating groove, the inside rotation in second rotating groove is connected with the second rotating turret, the top fixed mounting of second rotating turret has the second riser.
Preferably, the second spout has all been seted up to the both sides of first riser, the inside sliding connection of second spout has the slider, the top fixed mounting of slider has the inserted block, the surperficial one side symmetry fixed mounting of second riser has first mount, the top hinge connection of first riser has the apron.
Preferably, one side on apron top has been seted up first and has been accomodate the groove, the equal fixed mounting in both sides of first storage inslot portion has the third rotating turret, the inside of third rotating turret rotates and is connected with the handle, the one end of apron rotates and is connected with the stationary blade, the fixed slot has been seted up to the opposite side of stationary blade.
Preferably, the second has been seted up to the bottom of apron and has been accomodate the groove, the inside rotation that the groove was accomodate to the second is connected with the support frame, one side fixed mounting that the groove was accomodate to the second has the second fixed block, the second thread groove has been seted up to the inside of second fixed block, the inside threaded connection of second thread groove has the fourth threaded rod, the one end of fourth threaded rod is rotated and is connected with the second mount.
Preferably, top fixed mounting that first riser surface central point put department has spacing, the central point of spacing puts the department and has seted up logical groove, the inside sliding connection who leads to the groove has the movable rod, the surperficial one end fixed mounting of movable rod has the second spring, the one end fixed mounting of movable rod has the fixed disk.
Compared with the prior art, the invention has the beneficial effects that:
1. the first threaded rod is rotatably arranged, and the mounting frame ascends or descends under the condition that the first threaded cylinder and the first threaded rod in the mounting frame interact with each other, so that the intermediate frequency attenuator on the surface of the second fixing plate is ejected out of the box body, the operating space of a worker is enlarged, and the operation of the worker is facilitated;
2. under the effect of the first rotating frame and the second rotating frame that set up, first riser and second riser can expand, go to rotate the direction of sliding that the carousel adjusted the second slide bar according to the circumstances of reality again to can reach and go to adjust according to actual conditions, rotate the third threaded rod again, the screw slider is driving first fixed plate and is sliding under the effect of third threaded rod.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic view of a third threaded rod according to the present invention.
FIG. 3 is a schematic view of the expanded structure of the present invention.
Fig. 4 is a schematic structural diagram of the mounting rack of the present invention.
Fig. 5 is an enlarged view of the structure at B in fig. 1.
FIG. 6 is a schematic view of the structure of the stop frame of the present invention.
Fig. 7 is a cross-sectional view of the turntable of the present invention.
FIG. 8 is a schematic view of the circular groove structure of the present invention.
Fig. 9 is an enlarged view of a structure a in fig. 1.
In the figure: 1. a box body; 2. a first rotating groove; 3. a first rotating frame; 4. a first vertical plate; 5. a second rotating groove; 6. a second rotating frame; 7. a second vertical plate; 8. a second chute; 9. a slider; 10. inserting a block; 11. a first fixing frame; 12. a fixing sheet; 13. fixing grooves; 14. a limiting frame; 15. a movable rod; 16. a second spring; 17. a through groove; 18. fixing the disc; 19. a circular groove; 20. a card slot; 21. a turntable; 22. a first chute; 23. a first spring; 24. a telescopic block; 25. a first receiving groove; 26. a third rotating frame; 27. a handle; 28. a cover plate; 29. a second receiving groove; 30. a support frame; 31. a second fixed block; 32. a fourth threaded rod; 33. a second thread groove; 35. a second fixing frame; 36. a guide rail; 37. a guide groove; 38. a second slide bar; 39. a support block; 40. a threaded slider; 41. a first fixed block; 42. a first thread groove; 43. a third threaded rod; 44. a first fixing plate; 45. a mounting frame; 46. a first slide bar; 47. a first limit plate; 48. a first threaded rod; 49. a first threaded barrel; 50. a second fixing plate; 51. a cross groove; 52. a crosshead shoe; 53. a second threaded rod; 54. a second threaded barrel; 55. a splint; 56. inserting a rod; 57. and (4) a slot.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 (b): as shown in fig. 1 to 9, the invention provides an improved device of a medium frequency attenuator, which is convenient to operate, and comprises a box body 1 and a first fixing plate 44, a first slide bar 46 is fixedly installed at a corner of the top end of the first fixing plate 44, a first limiting plate 47 is fixedly installed at the top end of the first slide bar 46, an installation frame 45 is slidably connected to the outer surface of the first slide bar 46, the installation frame 45 can limit the installation frame 45 by sliding along the first slide bar 46, a second fixing plate 50 is fixedly installed inside the installation frame 45, a first threaded rod 48 is rotatably connected to the central position of one side of the top end of the first fixing plate 44, a first threaded cylinder 49 is fixedly installed at the central position inside one side of the top end of the installation frame 45, the first threaded cylinder 49 interacts with the first threaded rod 48 to drive the installation frame 45 to move up and down, and the first threaded rod 48 is in threaded connection with the first threaded cylinder 49.
In order to fix the medium-frequency attenuators with different sizes, specifically, a cross slot 51 is formed in the second fixing plate 50, cross sliding blocks 52 are symmetrically and slidably connected to the inside of the cross slot 51, a second threaded rod 53 is fixedly mounted at one end of each cross sliding block 52, each cross sliding block 52 slides inside the cross slot 51 along with the rotation of a second threaded cylinder 54 on the surface of the corresponding second threaded rod 53, second threaded cylinders 54 are mounted on the radial outer walls of the two second threaded rods 53 in a matched mode through internal and external threads, clamping plates 55 are fixedly mounted at the top ends of the cross sliding blocks 52, an inserting rod 56 is symmetrically and fixedly mounted at one end of one clamping plate 55, in the process that the clamping plates 55 slide along with the cross sliding blocks 52, the inserting rod 56 is inserted into a slot 57, and a slot 57 is symmetrically formed above the inside of the other clamping plate 55.
In order to let the intermediate frequency attenuator can extend at different angles, it is concrete, circular recess 19 has been seted up to the inside of 1 bottom of box body, a plurality of draw-in groove 20 has been seted up to the inner wall of circular recess 19, the inside rotation of circular recess 19 is connected with carousel 21, carousel 21 rotates in the inside of circular recess 19, a plurality of first spout 22 has been seted up to the inside of carousel 21, when flexible piece 24 breaks away from the inside of draw-in groove 20, receive the inside of first spout 22 with flexible piece 24 under the effect of first spring 23, the inside fixed mounting of first spout 22 has first spring 23, the one end fixed mounting of first spring 23 has flexible piece 24.
In order to facilitate the first fixing plate 44 to slide out of the interior of the box body 1, specifically, guide rails 36 are symmetrically and fixedly mounted at the top end of the rotating disc 21, a guide groove 37 is formed in the guide rail 36, a second slide bar 38 is slidably connected in the guide groove 37, the second slide bar 38 slides in the guide groove 37, and a supporting block 39 is fixedly mounted at one side of the top end of the second slide bar 38.
Specifically, a first fixing block 41 is fixedly mounted on one side of the center position of the top end of the rotary table 21, a first thread groove 42 is formed in the first fixing block 41, a third thread rod 43 is connected to the inner thread of the first thread groove 42, the thread slider 40 slides along the third thread slider 40 when the third thread rod 43 is rotated, the thread slider 40 is fixedly connected to the bottom end of the first fixing plate 44, and the thread slider 40 is connected to the surface of the third thread rod 43 through threads.
In order to increase staff's that can be further operating space, it is concrete, first rotating turret 2 has been seted up to the bilateral symmetry of 1 bottom of box body, the inside rotation of first rotating turret 2 is connected with first rotating turret 3, the top fixed mounting of first rotating turret 3 has first riser 4, first riser 4 can rotate under the effect of first rotating turret 3, second rotating turret 5 has been seted up to the adjacent both sides of first rotating turret 2, the inside rotation of second rotating turret 5 is connected with second rotating turret 6, the top fixed mounting of second rotating turret 6 has second riser 7, second riser 7 rotates under the effect of second rotating turret 6.
In order to fix first riser 4 and second riser 7, it is concrete, second spout 8 has all been seted up to the both sides of first riser 4, the inside sliding connection of second spout 8 has slider 9, the top fixed mounting of slider 9 has an inserted block 10, inserted block 10 slides in the inside of second spout 8 under the effect of slider 9, a lateral symmetry fixed mounting on second riser 7 surface has first mount 11, the top hinge connection of first riser 4 has apron 28.
In order to fix apron 28, specifically, first groove 25 of accomodating has been seted up to one side on apron 28 top, the equal fixed mounting in both sides of first groove 25 of accomodating inside has third rotating turret 26, and the inside of third rotating turret 26 rotates and is connected with handle 27, and handle 27 can rotate to the inside of first groove 25 of accomodating under the effect of third rotating turret 26, and the one end of apron 28 rotates and is connected with stationary blade 12, and fixed slot 13 has been seted up to the opposite side of stationary blade 12.
In order to support apron 28, specifically, the second groove 29 of accomodating has been seted up to the bottom of apron 28, the inside rotation that the groove 29 was accomodate to the second is connected with support frame 30, support frame 30 is rotatable to the second and accomodates the inside of groove 29, one side fixed mounting that the groove 29 was accomodate to the second has second fixed block 31, second thread groove 33 has been seted up to the inside of second fixed block 31, the internal thread of second thread groove 33 is connected with fourth threaded rod 32, the one end of fourth threaded rod 32 is rotated and is connected with second mount 35, it can remove second mount 35 to rotate fourth threaded rod 32, thereby fix support frame 30.
Specifically, top fixed mounting that 4 surperficial central points of first riser put department has spacing 14, logical groove 17 has been seted up to the central point of spacing 14 and put the department, the inside sliding connection who leads to groove 17 has movable rod 15, movable rod 15 can move about in the inside that leads to groove 17, the surperficial one end fixed mounting of movable rod 15 has second spring 16, second spring 16 fastens movable rod 15, the one end fixed mounting of movable rod 15 has fixed disk 18, fixed disk 18 is fixed to apron 28 along with the inside of launching to fixed slot 13 under movable rod 15 and second spring 16's the effect.
The working principle is as follows: pulling the insert 10 to slide along the second sliding groove 8 under the action of the sliding block 9, so as to extract the insert 10 from the inside of the first fixing frame 11, under the action of the first rotating frame 3 and the second rotating frame 6, the first vertical plate 4 and the second vertical plate 7 can rotate, so that the first vertical plate 4 and the second vertical plate 7 can be unfolded, rotating the first threaded rod 48, the mounting frame 45 can slide up and down under the action of the first threaded barrel 49 and the first threaded rod 48 inside, the mounting frame 45 can limit under the action of the first sliding rod 46, rotating the second threaded barrel 54, the cross sliding block 52 can slide inside the cross groove 51 under the action of the second threaded rod 53 and the second threaded barrel 54, so as to drive the clamping plate 55 to move, so that the insert rod 56 can be inserted into the inside of the slot 57, rotating the third threaded rod 43, and the threaded sliding block 40 can slide along with the third threaded rod 43, thereby driving the first fixing plate 44 to move, the second sliding rod 38 slides in the guiding groove 37 during the movement of the first fixing plate 44, the fourth threaded rod 32 is rotated to drive the second fixing frame 35 to move, the fixing plate 12 is rotated to the inside of the limiting frame 14, and then the movable rod 15 is loosened, so that the movable rod 15 extends the fixing plate 18 to the inside of the fixing groove 13 under the action of the second spring 16 to fix.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An easy-to-operate intermediate frequency attenuator improvement device, comprising a box body (1) and a first fixing plate (44), characterized in that: the corner fixed mounting on first fixed plate (44) top has first slide bar (46), the top fixed mounting of first slide bar (46) has first limiting plate (47), the surface sliding connection of first slide bar (46) has mounting bracket (45), the inside fixed mounting of mounting bracket (45) has second fixed plate (50), the central point of first fixed plate (44) top one side puts the department and rotates and is connected with first threaded rod (48), the inside central point of mounting bracket (45) top one side puts fixed mounting of department and has first screw thread section of thick bamboo (49), first threaded rod (48) and first screw thread section of thick bamboo (49) threaded connection.
2. The medium frequency attenuator improving device convenient to operate as claimed in claim 1, wherein a cross groove (51) is formed in the second fixing plate (50), cross sliding blocks (52) are symmetrically and slidably connected to the inside of the cross groove (51), a second threaded rod (53) is fixedly installed at one end of each cross sliding block (52), second threaded cylinders (54) are installed on the radial outer walls of the two second threaded rods (53) in a matched mode through internal and external threads, clamping plates (55) are fixedly installed at the top ends of the cross sliding blocks (52), an inserting rod (56) is symmetrically and fixedly installed on the inner wall of one clamping plate (55), and inserting grooves (57) are symmetrically formed in the inner wall of the other clamping plate (55).
3. The medium frequency attenuator improving device convenient to operate as claimed in claim 1, wherein a circular groove (19) is formed in the inner portion of the bottom end of the box body (1), a plurality of clamping grooves (20) are formed in the inner wall of the circular groove (19), a rotating disc (21) is rotatably connected to the inner portion of the circular groove (19), a plurality of first sliding grooves (22) are formed in the inner portion of the rotating disc (21), a first spring (23) is fixedly installed in the first sliding grooves (22), and a telescopic block (24) is fixedly installed at one end of the first spring (23).
4. The easy-to-operate intermediate frequency attenuator improving device as recited in claim 3, wherein the top end of the rotary table (21) is symmetrically and fixedly installed with a guide rail (36), a guide groove (37) is opened inside the guide rail (36), a second slide bar (38) is slidably connected inside the guide groove (37), and a supporting block (39) is fixedly installed on one side of the top end of the second slide bar (38).
5. The easy-to-operate intermediate frequency attenuator improving device is characterized in that a first fixing block (41) is fixedly installed on one side of the center position of the top end of the rotating disc (21), a first thread groove (42) is formed in the first fixing block (41), a third threaded rod (43) is connected to the inner thread of the first thread groove (42), and a threaded sliding block (40) is connected to the surface thread of the third threaded rod (43).
6. The easy-to-operate intermediate frequency attenuator improvement device as claimed in claim 1, characterized in that the box body (1) bottom has first rotation slots (2) symmetrically formed on both sides thereof, the first rotation slots (2) have first rotation frames (3) rotatably connected to the inside thereof, the first rotation frames (3) have first vertical plates (4) fixedly mounted on the top ends thereof, the first rotation slots (2) have second rotation slots (5) formed on the adjacent sides thereof, the second rotation slots (5) have second rotation frames (6) rotatably connected to the inside thereof, and the second rotation frames (6) have second vertical plates (7) fixedly mounted on the top ends thereof.
7. The middle-frequency attenuator improving device convenient to operate as claimed in claim 6, wherein the first vertical plate (4) is provided with second sliding grooves (8) on both sides, the second sliding grooves (8) are connected with sliding blocks (9) in a sliding manner, the top ends of the sliding blocks (9) are fixedly provided with inserting blocks (10), one side of the surface of the second vertical plate (7) is symmetrically and fixedly provided with a first fixing frame (11), and the top end of the first vertical plate (4) is hinged with a cover plate (28).
8. The easy-to-operate intermediate frequency attenuator improving device as recited in claim 7, wherein a first accommodating groove (25) is formed at one side of the top end of the cover plate (28), third rotating frames (26) are fixedly mounted at both sides of the inside of the first accommodating groove (25), a handle (27) is rotatably connected to the inside of the third rotating frame (26), a fixing plate (12) is rotatably connected to one end of the cover plate (28), and a fixing groove (13) is formed at the other side of the fixing plate (12).
9. The improved device for the intermediate frequency attenuator convenient to operate as claimed in claim 8, wherein a second accommodating groove (29) is formed at the bottom end of the cover plate (28), the inside of the second accommodating groove (29) is rotatably connected with a supporting frame (30), a second fixing block (31) is fixedly mounted at one side of the second accommodating groove (29), a second thread groove (33) is formed inside the second fixing block (31), a fourth threaded rod (32) is connected to the inside of the second thread groove (33) in a threaded manner, and a second fixing frame (35) is rotatably connected to one end of the fourth threaded rod (32).
10. The easy-to-operate intermediate frequency attenuator improving device as recited in claim 7, wherein a limiting frame (14) is fixedly installed above the central position of the surface of the first vertical plate (4), a through groove (17) is opened at the central position of the limiting frame (14), a movable rod (15) is slidably connected inside the through groove (17), a second spring (16) is fixedly installed at one end of the surface of the movable rod (15), and a fixed plate (18) is fixedly installed at one end of the movable rod (15).
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| CN202111558809.2A CN114245051B (en) | 2021-12-20 | 2021-12-20 | Intermediate frequency attenuator improves device convenient to operation |
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| CN202111558809.2A CN114245051B (en) | 2021-12-20 | 2021-12-20 | Intermediate frequency attenuator improves device convenient to operation |
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| KR102148133B1 (en) * | 2019-10-10 | 2020-08-26 | (주)대성스텐 | Vibration Isolation for Case |
| CN212338766U (en) * | 2020-02-13 | 2021-01-12 | 怀化职业技术学院 | Photographic device |
| CN212420438U (en) * | 2020-04-30 | 2021-01-29 | 刘亚光 | Fixing device is used in mould processing |
| CN212244327U (en) * | 2020-05-20 | 2020-12-29 | 鹰潭明康通信技术有限公司 | Transportation equipment box of attenuator |
| CN212573211U (en) * | 2020-07-21 | 2021-02-19 | 武汉晨皓光通信科技有限公司 | Protection device for attenuator is connected |
| CN213989150U (en) * | 2020-11-11 | 2021-08-17 | 上海阙巨通讯设备有限公司 | Adjustable attenuator |
| CN213584107U (en) * | 2020-12-01 | 2021-06-29 | 南京睿耐特通信技术有限公司 | Adjustable attenuator convenient to overhaul |
| CN213812585U (en) * | 2020-12-21 | 2021-07-27 | 苏州道安自动化技术有限公司 | Automobile lamp brightness testing device |
| CN112782782A (en) * | 2020-12-30 | 2021-05-11 | 华清瑞达（天津）科技有限公司 | Microwave module automation calibration platform convenient to adjust |
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