CN114705898A - Damage-proof ammeter based on contraction type and capable of conveniently storing cords - Google Patents
Damage-proof ammeter based on contraction type and capable of conveniently storing cords Download PDFInfo
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- CN114705898A CN114705898A CN202210344451.1A CN202210344451A CN114705898A CN 114705898 A CN114705898 A CN 114705898A CN 202210344451 A CN202210344451 A CN 202210344451A CN 114705898 A CN114705898 A CN 114705898A
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- rack
- balancing weight
- ammeter
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- ammeter body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/04—Housings; Supporting racks; Arrangements of terminals
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- General Physics & Mathematics (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention discloses a damage-proof ammeter capable of conveniently containing cords based on a contraction type, which comprises a balancing weight, wherein sliding rods are arranged on two sides of the top of the balancing weight, third springs are sleeved at the bottoms of the outer sides of two groups of sliding rods, and a base is arranged at the top of the outer side of each sliding rod in a sliding mode. According to the invention, the balancing weight is arranged at the bottom of the base, so that the integral gravity center of the ammeter body is arranged above the balancing weight, the ammeter body is more stable when placed and used, the toppling of the ammeter body when used is reduced, when the ammeter body falls accidentally, the balancing weight is always positioned below the ammeter body due to the larger balancing weight of the balancing weight, the balancing weight is firstly in contact with the ground, the balancing weight stops descending at the moment, the ammeter body continues to descend, the two groups of third springs are extruded through the base, the third springs generate elastic force to buffer the ammeter body, the impact force of the ammeter body is reduced, and the ammeter body is protected.
Description
Technical Field
The invention relates to the technical field of ampere meters, in particular to a damage-proof ampere meter based on a contraction type rope which can conveniently contain the rope.
Background
With the progress of science and technology and the continuous development of society, in the aspect of science and technology, a direct current ammeter is usually used for measuring current, so that the detection is convenient, great convenience is brought to the exploration of people, the types of the direct current ammeter are more and more diversified, and the current direct current ammeter can be known to basically meet the requirements of people.
The current ammeter has certain disadvantages when in use:
1. when the ammeter is used, because the structure of the ammeter is simple, when the ammeter falls off accidentally, internal parts are easily damaged, unnecessary loss of the ammeter is increased, and when the ammeter is protected, only a shell is simply added, but a large impact force still can be applied when the ammeter falls off;
2. meanwhile, the ammeter is generally connected with a connected wire, but when the ammeter is idle, the wire is directly wound on the outer side of the ammeter, so that the wire is directly exposed to the outside, the connection part of the wire and the ammeter is bent, and the wire is easily damaged due to the fact that an outer coating of the wire cracks;
3. when the ampere meter is idle, the transparent plastic cover is directly exposed to the outside, a large amount of dust can be generated, meanwhile, the transparent plastic cover can be oxidized and transformed, the transparent plastic cover is blurred, the reading is labor-consuming, the transparent plastic cover is easy to break when falling, and the damage to parts inside the pointer and the like is caused.
Disclosure of Invention
The invention aims to provide a damage-proof ammeter based on a contraction type rope, which can conveniently store the rope, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: can convenient storage cotton rope's loss prevention bad ampere meter based on contraction type, including the balancing weight, the both sides at balancing weight top are provided with the slide bar, and are two sets of the bottom cover in the slide bar outside is equipped with the third spring, the top in the slide bar outside slides and is provided with the base, the top of slide bar is provided with the second rack, the top of base is provided with the ampere meter body, the both sides of the positive one end bottom of ampere meter body are provided with accomodates the subassembly, the top of the positive one end of balancing weight is provided with display panel, the top of ampere meter body both sides is provided with the gear, the both sides of the positive one end top of balancing weight are provided with the piston rod, the both sides at balancing weight one end top are provided with and shield the subassembly.
Preferably, the storage assembly comprises a storage frame, a coil spring, a winding roll, a first annular rack, a rotating shaft, a first spring and a second annular rack, the storage frame is provided with two sets of two sides which are respectively located at the bottom of the front end of the ammeter body, the back end of the interior of the storage frame is provided with the rotating shaft, the winding roll is arranged at the middle position of the outer side of the rotating shaft, the coil spring is arranged at one end of the outer side of the rotating shaft, the first spring is sleeved at one end of the outer side of the rotating shaft, the second annular rack is arranged at one end of the back of the first spring, and the first annular rack is arranged at the middle position of the front end of the storage frame.
Preferably, the shielding component comprises an installation chute, an installation sliding block, a protection air bag, a baffle, a piston cylinder, a top plate, an air inlet pipe, a magnet, a second spring, an accommodating groove, a first rack and a pull rod, wherein the installation chute is provided with two groups of two sides which are positioned at the top of one end of the front side of the ammeter body, the installation sliding block is arranged in the installation chute in a sliding manner, the baffle is arranged at one end of the front side of the two groups of installation sliding blocks, the top plate is arranged at the top of the baffle, the piston cylinder is arranged at two sides of the bottom of the top plate, the air inlet pipe is arranged at one side of the two groups of piston cylinders which are close to each other, the protection air bag is arranged at the middle position of one end of the back side of the baffle, the accommodating groove is arranged at two sides of one end of the back side of the baffle, the pull rod is arranged in a sliding manner, the first rack is arranged at one end of the back side of the pull rod, the second spring is sleeved outside the pull rod, and a magnet is arranged in the middle of the bottom of the top plate.
Preferably, the piston cylinder is located right above the piston rod, and the piston rod and the piston cylinder are matched in a sliding mode.
Preferably, the top of ampere meter body is provided with the recess, and recess and intake pipe mutual adaptation.
Preferably, a limiting block is arranged at one end of the front face of the rotating shaft, and the second annular rack is sleeved on the second annular rack.
Preferably, the gear is located between the second rack and the first rack, and the gear is meshed with the second rack and the first rack.
Preferably, the cross sections of the mounting sliding groove and the mounting sliding block are T-shaped.
Preferably, the air inlet pipe consists of a long straight pipe and an L-shaped pipe, and the L-shaped pipe is connected with the protective air bag.
Preferably, the piston rod consists of a piston and a telescopic rod, and the bottom of the telescopic rod is fixedly connected with the ammeter body.
Compared with the prior art, the invention provides the damage-proof ammeter based on the contraction type and capable of conveniently containing the cord, and the ammeter has the following beneficial effects:
1. according to the invention, the balancing weight is arranged at the bottom of the base, so that the integral gravity center of the ammeter body is positioned above the balancing weight, the ammeter body is more stable when placed and used, the toppling of the ammeter body when used is reduced, when the ammeter body falls accidentally, the balancing weight is always positioned below the ammeter body due to the larger balancing weight of the balancing weight, the balancing weight is firstly contacted with the ground, the balancing weight stops descending at the moment, the ammeter body continues to descend, the two groups of third springs are extruded through the base, the third springs generate elastic force to buffer the ammeter body, the impact force of the ammeter body is reduced, and the ammeter body is protected;
2. the collecting frame is used for collecting the lead on the ammeter body, so that the lead is protected, the breakage of a circuit caused by continuous bending of the lead is prevented, the lead is collected, the neatness of the ammeter body is increased, the required length of the lead can be pulled out at will, the redundant length of the lead is reduced, the lead is directly connected to the outside, and the trouble caused to detection is reduced.
3. The display panel on the ammeter body can be protected through the top plate and the baffle plate, the display panel can be protected when the ammeter body is idle, meanwhile, when the ammeter body accidentally drops, the baffle plate can slide downwards to the front of the display panel through mutual transmission between the gear and the first rack to protect the display panel, the protection air bag can be inflated through cooperation between the piston rod and the piston cylinder while moving, complete wrapping protection is carried out on the display panel, and the protection effect is improved.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a front cross-sectional view of the receiving assembly of the present invention;
FIG. 3 is a side cross-sectional view of the receiving assembly of the present invention;
FIG. 4 is a rear cross-sectional view of the shield assembly of the present invention;
FIG. 5 is a side cross-sectional view of the shield assembly of the present invention;
fig. 6 is a back sectional view of the present invention.
In the figure: 1. a balancing weight; 2. a receiving assembly; 201. a storage frame; 202. a coil spring; 203. a wind-up roll; 204. a first annular rack; 205. a rotating shaft; 206. a first spring; 207. a second annular rack; 3. a shutter assembly; 301. installing a chute; 302. installing a sliding block; 303. a protective airbag; 304. a baffle plate; 305. a piston cylinder; 306. a top plate; 307. an air inlet pipe; 308. a magnet; 309. a second spring; 310. a receiving groove; 311. a first rack; 312. a pull rod; 4. a slide bar; 5. a display panel; 6. a gear; 7. a second rack; 8. a third spring; 9. a base; 10. an ammeter body; 11. a piston rod.
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.
Referring to fig. 1-6, the present invention provides the following technical solutions: can convenient storage cotton rope's loss prevention bad ampere meter based on contraction type, including balancing weight 1, the both sides at 1 top of balancing weight are provided with slide bar 4, the bottom cover in the two sets of slide bar 4 outsides is equipped with third spring 8, the top in the slide bar 4 outside slides and is provided with base 9, the top of slide bar 4 is provided with second rack 7, base 9's top is provided with ampere meter body 10, the both sides of the positive one end bottom of ampere meter body 10 are provided with accomodates subassembly 2, the top of 1 positive one end of balancing weight is provided with display panel 5, the top of 10 both sides of ampere meter body is provided with gear 6, the both sides of 10 back one end of ampere meter body are provided with piston rod 11, the both sides at 1 positive one end top of balancing weight are provided with shields subassembly 3, shield the protection to display panel 5.
As a preferable embodiment of the present embodiment: accomodate subassembly 2 including accomodating frame 201, coil spring 202, wind-up roll 203, first annular rack 204, pivot 205, first spring 206 and second annular rack 207, it is provided with two sets of both sides that are located ampere meter body 10 front one end bottom respectively to accomodate frame 201, it is provided with pivot 205 to accomodate the inside back one end of frame 201, the intermediate position department in the pivot 205 outside is provided with wind-up roll 203, the back one end in the pivot 205 outside is provided with coil spring 202, the front pot head in the pivot 205 outside is equipped with first spring 206, the back one end of first spring 206 is provided with second annular rack 207, it is provided with first annular rack 204 to accomodate the intermediate position department of the positive one end of frame 201, can collect the wire.
As a preferable embodiment of the present embodiment: the shielding component 3 comprises a mounting chute 301, a mounting slide block 302, a protective air bag 303, a baffle 304, a piston cylinder 305, a top plate 306, an air inlet pipe 307, a magnet 308, a second spring 309, a containing groove 310, a first rack 311 and a pull rod 312, wherein the mounting chute 301 is provided with two groups of two sides positioned at the top of one end of the front surface of the ammeter body 10, the mounting slide block 302 is arranged in the mounting chute 301 in a sliding manner, the baffle 304 is arranged at one end of the front surface of the two groups of mounting slide blocks 302, the top plate 306 is arranged at the top of the baffle 304, the piston cylinders 305 are arranged at two sides of the bottom of the top plate 306, the air inlet pipe 307 is arranged at one side of the two groups of piston cylinders 305 close to each other, the protective air bag 303 is arranged at the middle position of one end of the back surface of the baffle 304, the containing groove 310 is arranged at two sides of one end of the back surface of the baffle 304, the pull rod 312 is arranged in a sliding manner, the pull rod 312 is provided with the first rack 311, the outer side of the pull rod 312 is sleeved with a second spring 309, and the middle position of the bottom of the top plate 306 is provided with a magnet 308, so that the display panel 5 can be protected when falling.
As a preferable embodiment of the present embodiment: the piston cylinder 305 is located right above the piston rod 11, and the piston rod 11 and the piston cylinder 305 are slidably fitted to each other, so that the gas inside the piston cylinder 305 enters the inside of the protective airbag 303.
As a preferable embodiment of the present embodiment: the top of ampere meter body 10 is provided with the recess, and recess and the mutual adaptation of intake pipe 307 can place intake pipe 307, prevents to extrude intake pipe 307.
As a preferable embodiment of the present embodiment: a limiting block is arranged at one end of the front surface of the rotating shaft 205, and the second annular rack 207 is sleeved on the second annular rack 207 and can limit the rotating shaft 205.
As a preferable embodiment of the present embodiment: the gear 6 is located between the second rack 7 and the first rack 311, and the gear 6 is engaged with the second rack 7 and the first rack 311, so as to drive the second rack 7 to the first rack 311.
As a preferable embodiment of the present embodiment: the cross sections of the mounting sliding chute 301 and the mounting sliding block 302 are T-shaped, so that the baffle 304 is prevented from being separated.
As a preferable embodiment of the present embodiment: the intake pipe 307 is composed of a long straight pipe and an L-shaped pipe, and the L-shaped pipe is connected to the protective airbag 303, and can inflate the protective airbag 303.
As a preferable embodiment of the present embodiment: the piston rod 11 is composed of a piston and a telescopic rod, and the bottom of the telescopic rod is fixedly connected with the ammeter body 10 to convey gas inside the piston cylinder 305.
In embodiment 1, as shown in fig. 3 to 6, normally, the baffle 304 is located right in front of the display panel 5, the first rack 311 is meshed with the gear 6, when the ammeter body 10 needs to be used, the pull rod 312 is pulled to drive the first rack 311 to move towards the inside of the receiving groove 310, the first rack 311 and the gear 6 are away from each other and are disengaged, at this time, the baffle 304 can be pushed upwards by the mounting slider 302 sliding in the mounting chute 301, the display panel 5 is displayed for use, at the same time, the piston cylinder 305 and the piston rod 11 slide relatively, the gas inside the protective airbag 303 is pumped into the piston cylinder 305 through the air inlet pipe 307, then the pull rod 312 is released to cause the first rack 311 to be meshed with the gear 6 again, since the gear 6 needs to slide downwards outside the second rack 7, the ammeter body 10 moves downwards, but the ammeter body 10 is supported by the two sets of third springs 8 through the base 9, therefore, the baffle 304 is stably supported, and the influence of the sliding of the baffle 304 on the use is prevented.
Example 2, as shown in fig. 1 to 6, when the ammeter body 10 accidentally drops, due to the large counterweight of the counterweight block 1, the counterweight block 1 is always located below the ammeter body 10, so that the counterweight block 1 first contacts with the ground, at this time, the counterweight block 1 stops descending, the ammeter body 10 continues descending, the two sets of third springs 8 are extruded by the base 9, so that the third springs 8 generate elastic force to buffer the ammeter body 10, the impact force of the ammeter body 10 is reduced, the ammeter body 10 is protected, at the same time, the gear 6 rotates on the second rack 7 to drive the first rack 311 to move downward, the first rack 311 drives the baffle 304 to move downward by the pull rod 312, and at the same time, the piston cylinder 305 and the piston rod 11 slide relatively to extrude the gas inside the piston cylinder 305 into the protection airbag 303, so as to inflate and swell the protection airbag 303, the display panel 5 is wrapped and protected, and meanwhile, the magnets 308 are mutually adsorbed when being close to the ammeter body 10, and the top plate 306 is fixed, so that the ammeter body 10 is protected.
The working principle is as follows: firstly, under normal conditions, the baffle 304 is positioned right in front of the display panel 5, the first rack 311 is meshed with the gear 6, when the ammeter body 10 needs to be used, the pull rod 312 is pulled to drive the first rack 311 to move towards the inside of the accommodating groove 310, the first rack 311 and the gear 6 are away from each other to be disengaged, at this time, the baffle 304 can be pushed upwards, the display panel 5 is displayed for use, and the pull rod 312 is released to enable the first rack 311 to be meshed with the gear 6 again;
meanwhile, the air inlet pipe 307 slides along the outer side of the piston cylinder 305, is away from the first annular rack 204, relieves the limit on the rotating shaft 205, then pulls the conducting wire wound on the outer side of the winding roll 203 out of the interior of the storage frame 201, pulls out the required used length, then loosens the second annular rack 207, under the elastic force of the first spring 206, the second annular rack 207 and the first annular rack 204 are meshed with each other for limiting, during storage, the second annular rack 207 and the first annular rack 204 are separated from each other, under the elastic force of the coil spring 202, the rotating shaft 205 is enabled to rotate reversely, and the conducting wire is recovered;
when the ammeter body 10 accidentally drops, because the counterweight of the counterweight block 1 is large, the counterweight block 1 is always positioned below the ammeter body 10, so that the counterweight block 1 contacts with the ground first, at this time, the counterweight block 1 stops descending, the ammeter body 10 continues descending, two groups of third springs 8 are extruded through the base 9, the third springs 8 generate elastic force to buffer the ammeter body 10, the impact force of the ammeter body 10 is reduced, the ammeter body 10 is protected, meanwhile, the gear 6 rotates on the second rack 7 to drive the first rack 311 to move downwards, the first rack 311 drives the baffle 304 to move downwards through the pull rod 312, meanwhile, the piston cylinder 305 and the piston rod 11 slide relatively, the gas in the piston cylinder 305 is extruded to the inside of the protection airbag 303, the protection airbag 303 is inflated and inflated to be inflated and expanded to protect the display panel 5, meanwhile, the magnets 308 are attracted to each other when they approach the ammeter body 10, and fix the top plate 306, thereby protecting the ammeter body 10.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. Can convenient bad ampere meter of loss prevention that accomodates cotton rope based on contraction type, including balancing weight (1), its characterized in that: the utility model discloses a balance weight, including balancing weight (1), balancing weight (1) top, slide bar (4) outside, the top in slide bar (4) outside is slided and is provided with base (9), the top of slide bar (4) is provided with second rack (7), the top of base (9) is provided with ampere meter body (10), the both sides of the positive one end bottom of ampere meter body (10) are provided with accomodate subassembly (2), the top of the positive one end of balancing weight (1) is provided with display panel (5), the top of ampere meter body (10) both sides is provided with gear (6), the both sides of the back one end of ampere meter body (10) are provided with piston rod (11), the both sides at the positive one end top of balancing weight (1) are provided with and shield subassembly (3).
2. The collapse-proof ammeter based on contraction-type and capable of conveniently receiving a cord as claimed in claim 1, wherein: accomodate subassembly (2) including accomodating frame (201), wind spring (202), wind-up roll (203), first annular rack (204), pivot (205), first spring (206) and second annular rack (207), accomodate frame (201) and be provided with two sets of both sides that are located ampere meter body (10) front one end bottom respectively, accomodate the inside back one end in frame (201) and be provided with pivot (205), the intermediate position department in pivot (205) outside is provided with wind-up roll (203), the back one end in pivot (205) outside is provided with wind spring (202), the front pot head in pivot (205) outside is equipped with first spring (206), the back one end in first spring (206) is provided with second annular rack (207), the intermediate position department of accomodating frame (201) front one end is provided with first annular rack (204).
3. The collapse-proof ammeter based on contraction-type and capable of conveniently receiving a cord as claimed in claim 1, wherein: the shielding component (3) comprises an installation chute (301), installation sliding blocks (302), protective air bags (303), baffles (304), piston cylinders (305), a top plate (306), air inlet pipes (307), magnets (308), second springs (309), accommodating grooves (310), first racks (311) and pull rods (312), wherein the installation chute (301) is provided with two groups of two sides located at the top of one end of the front face of the ammeter body (10), the installation sliding blocks (302) are arranged inside the installation chute (301) in a sliding mode, the baffles (304) are arranged at one end of the front face of the two groups of installation sliding blocks (302), the top plate (306) is arranged at the top of the baffles (304), the piston cylinders (305) are arranged on two sides of the bottom of the top plate (306), the air inlet pipes (307) are arranged on one side, close to each other, the protective air bags (303) are arranged at the middle position of one end of the back face of the baffles (304), baffle (304) back one end both sides are provided with and accomodate groove (310), the inside slip of accomodating groove (310) is provided with pull rod (312), the back one end of pull rod (312) is provided with first rack (311), the outside cover of pull rod (312) is equipped with second spring (309), the intermediate position department of roof (306) bottom is provided with magnet (308).
4. The collapse-proof ammeter based on retractable cord capable of conveniently receiving cords as claimed in claim 3, wherein: the piston cylinder (305) is positioned right above the piston rod (11), and the piston rod (11) and the piston cylinder (305) are matched in a sliding mode.
5. The collapse-proof ammeter based on contraction-type and capable of conveniently receiving a cord as claimed in claim 1, wherein: the top of the ammeter body (10) is provided with a groove, and the groove is matched with the air inlet pipe (307).
6. The collapse-proof ammeter based on contraction that can conveniently receive a cord as claimed in claim 2, wherein: a limiting block is arranged at one end of the front face of the rotating shaft (205), and the second annular rack (207) is sleeved on the second annular rack (207).
7. The anti-damage ammeter based on retractable cord and capable of conveniently receiving cord as claimed in claim 1, wherein: the gear (6) is positioned between the second rack (7) and the first rack (311), and the gears (6) are meshed with the second rack (7) and the first rack (311).
8. The collapse-proof ammeter based on retractable cord capable of conveniently receiving cords as claimed in claim 3, wherein: the cross sections of the mounting sliding groove (301) and the mounting sliding block (302) are T-shaped.
9. The collapse-proof ammeter based on retractable cord capable of conveniently receiving cords as claimed in claim 3, wherein: the air inlet pipe (307) is composed of a long straight pipe and an L-shaped pipe, and the L-shaped pipe is connected with the protective air bag (303).
10. The collapse-proof ammeter based on contraction-type and capable of conveniently receiving a cord as claimed in claim 1, wherein: the piston rod (11) consists of a piston and a telescopic rod, and the bottom of the telescopic rod is fixedly connected with the ammeter body (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210344451.1A CN114705898A (en) | 2022-03-31 | 2022-03-31 | Damage-proof ammeter based on contraction type and capable of conveniently storing cords |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210344451.1A CN114705898A (en) | 2022-03-31 | 2022-03-31 | Damage-proof ammeter based on contraction type and capable of conveniently storing cords |
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| Publication Number | Publication Date |
|---|---|
| CN114705898A true CN114705898A (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210344451.1A Pending CN114705898A (en) | 2022-03-31 | 2022-03-31 | Damage-proof ammeter based on contraction type and capable of conveniently storing cords |
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| CN (1) | CN114705898A (en) |
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| CN212965136U (en) * | 2020-09-30 | 2021-04-13 | 美立华电力科技有限公司 | Ammeter with protection mechanism |
| CN213782503U (en) * | 2020-10-21 | 2021-07-23 | 浙江申宇科技股份有限公司 | High protection direct current screen for mine |
| CN214480948U (en) * | 2021-05-06 | 2021-10-22 | 山西鑫中毅科技有限公司 | Public security law enforcement record appearance with prevent falling structure |
| CN215875977U (en) * | 2021-08-06 | 2022-02-22 | 王园园 | Intracardiac branch of academic or vocational study low pressure pulse physiotherapy device |
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