CN110823994A - Magnetic powder detecting device for detecting metal cracks - Google Patents
Magnetic powder detecting device for detecting metal cracks Download PDFInfo
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- CN110823994A CN110823994A CN201911247720.7A CN201911247720A CN110823994A CN 110823994 A CN110823994 A CN 110823994A CN 201911247720 A CN201911247720 A CN 201911247720A CN 110823994 A CN110823994 A CN 110823994A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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Abstract
The invention discloses a magnetic powder detection device for detecting metal cracks, which comprises a machine body and a buffer mechanism, wherein the top of the front end of the machine body is fixedly connected with a groove body, the top of the inside of the machine body is fixedly connected with a hydraulic telescopic rod, the end part of the hydraulic telescopic rod is fixedly connected with a fixed frame, the fixed frame is installed at the top end of the groove body, the inside of the machine body is fixedly connected with a guide plate, the end part of the guide plate is installed at the top of the inner end of the groove body, the outer side surface of the guide plate is provided with an accommodating groove, the buffer mechanism comprises a limit plate, the limit plate is installed inside the accommodating groove, the limit plate and the inner wall of the bottom of the accommodating groove are fixedly connected with a; through the limiting plate of design, the limiting plate contacts with the work piece of whereabouts in-process, and the limiting plate avoids under pivot and torsional spring effect with work piece straight line striking, and the work piece whereabouts in-process is more stable, safety.
Description
Technical Field
The invention belongs to the technical field of metal detection, and particularly relates to a magnetic powder detection device for detecting metal cracks.
Background
Metal is an important component of modern technology, and in order to ensure that the quality of the metal is qualified, crack defect detection must be carried out on the metal, and the metal crack detection device appearing on the market at present still has various defects and cannot meet the requirements of production and life.
The existing magnetic particle detecting device can generate larger acceleration when a workpiece is conveyed through a guide plate, so that the workpiece falls on the ground, and therefore the magnetic particle detecting device for detecting metal cracks is provided.
Disclosure of Invention
The invention aims to provide a magnetic powder detecting device for detecting metal cracks, which solves the problem that the existing magnetic powder detecting device proposed in the background art generates large acceleration when a workpiece is conveyed through a guide plate, so that the workpiece falls on the ground.
In order to achieve the purpose, the invention provides the following technical scheme: a magnetic powder detection device for detecting metal cracks comprises a machine body and a buffering mechanism, wherein a groove body is fixedly connected to the top of the front end of the machine body, a hydraulic telescopic rod is fixedly connected to the top of the inner portion of the machine body, a fixing frame is fixedly connected to the end portion of the hydraulic telescopic rod and is installed at the top end of the groove body, a guide plate is fixedly connected to the inner portion of the machine body, the end portion of the guide plate is installed at the top of the inner end of the groove body, an accommodating groove is formed in the outer side surface of the guide plate, the buffering mechanism comprises a limiting plate, the limiting plate is installed inside the accommodating groove, a rotating shaft is fixedly connected to the limiting plate and the inner wall of the bottom of the accommodating groove, the rotating shaft is installed inside the top end of the accommodating groove, an elastic sheet is fixedly connected to the limiting plate and the inner wall of the top of the accommodating, the torsional spring is installed in the accommodating groove, and the limiting plate is perpendicular to the accommodating groove.
Preferably, the outer wall of one side of the machine body is fixedly connected with an electric cabinet, the two sides of the front end of the machine body are fixedly connected with electric control buttons, the surface of the front end of the machine body is provided with a storage groove, the surface of the rear end of the machine body is provided with a discharge hole, and the other end of the guide plate is fixed at the bottom of the port of the discharge hole.
Preferably, a cover plate is arranged outside the port of the storage groove, a hinge is fixedly connected between the cover plate and the inner wall of the bottom of the storage groove, the outer side surface of the cover plate is flush with the front end surface of the machine body, and a handle is arranged on the outer side of the top end of the cover plate.
Preferably, the inner wall of the top of the storage groove is fixedly connected with a magnetic seat, the inner side of the top end of the cover plate is fixedly connected with a magnetic buckle, the magnetic buckle and the magnetic seat correspond to each other and are arranged on a straight line, and the magnetic buckle and the end face of the magnetic seat are attached to each other.
Preferably, the square groove has been seted up to the organism in the bottom of discharge gate, the bottom inner wall fixedly connected with crosspiece of square groove, the square groove is provided with in the top of crosspiece and puts the thing board, the equal fixedly connected with flange of both sides outer wall of putting the thing board.
Preferably, the inner both sides of putting the thing board have all been seted up the circular slot, the inside of circular slot is provided with the reference column, the cross section of reference column is "T" font structure, the terminal surface of reference column and the inboard inner wall fixedly connected with fixed spring of circular slot.
Preferably, the inner walls of the two sides of the square groove are provided with limit grooves, the limit grooves correspond to the circular grooves and are on the same straight line, the port of the circular groove is fixedly connected with a limit ring, and the end part of the positioning column penetrates through the limit ring and is fixed in the limit groove.
Preferably, a bayonet is formed in the surface of the outer end of the object placing plate, a connecting hole is formed between the bayonet and the circular groove, the connecting hole is formed in the object placing plate, a pressing plate is arranged inside the inner end of the bayonet, and a reset spring is fixedly connected to the inner side wall of the pressing plate and the inner side wall of the bayonet.
Preferably, a thin rope is arranged inside the connecting hole, the bayonet, the connecting hole and the circular groove are communicated with each other, one end of the thin rope is fixed on the outer wall of the end part of the pressing plate, and the other end of the thin rope is fixed on the surface of the inner end of the positioning column.
Preferably, the draw-in groove has been seted up to the top inboard of square groove, the inboard inner wall fixedly connected with gasket of draw-in groove, put the inboard fixedly connected with of outer end of thing board and fix and detain, fixed knot just on a straight line with the draw-in groove mutual correspondence, fixed knot is installed in the inside of draw-in groove, the terminal surface of fixed knot is laminated with the surface of gasket each other.
Compared with the prior art, the invention has the beneficial effects that:
1. through the groove of accomodating, limiting plate, pivot, torsional spring and sheetmetal of design, solved current magnetic particle detecting device and can produce great acceleration when conveying the work piece through the deflector to lead to the work piece to fall the problem on ground, the limiting plate contacts with the work piece of whereabouts in-process, and the limiting plate avoids under pivot and torsional spring effect with work piece straight line striking, work piece whereabouts in-process is more stable, safety.
2. Through the storing groove and the apron of design, solved current magnetic particle detection device and need in time maintain repair in order to guarantee to be in the good operating condition of equipment, but the instrument that is used for maintaining repair all needs the problem of extra preparation, the maintenance is placed inside the storing inslot in advance with the instrument, and the apron is detained through magnetism and is fixed at the storing groove port with the magnetic force attraction of magnetism seat, is convenient for in time take the instrument to maintain repair.
3. Through putting thing board, crosspiece, reference column and the pressing plate of design, solved the problem that it surveyed to accomplish the work piece and is not convenient for collect the arrangement of current magnetic detection device, put the thing board daily accomodate inside the square groove through fixed the knot, put the collection that the thing board passes through the rotatory expansion work piece of reference column, and put the thing board and can control the flexible of reference column through the pressing plate, will put the thing board and lift off the arrangement of accomodating of the work piece of being convenient for.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a magnetic base according to the present invention;
FIG. 3 is a schematic view of a guide plate structure according to the present invention;
FIG. 4 is a schematic diagram of a stopper plate structure according to the present invention;
FIG. 5 is a schematic view of the discharge port of the present invention;
FIG. 6 is a schematic view of a storage board structure according to the present invention;
FIG. 7 is a schematic view of a pressing plate according to the present invention;
FIG. 8 is a schematic view of a positioning post structure according to the present invention;
fig. 9 is a schematic view of the fixing buckle structure of the present invention.
In the figure: 1. an electric cabinet; 2. a trough body; 3. an electronic control button; 4. a handle; 5. a hinge; 6. a cover plate; 7. a body; 8. a guide plate; 9. a fixed mount; 10. a hydraulic telescopic rod; 11. a storage tank; 12. a magnetic base; 13. a magnetic buckle; 14. a limiting plate; 15. a receiving groove; 16. an elastic sheet; 17. a rotating shaft; 18. a torsion spring; 19. a square groove; 20. a storage plate; 21. a crosspiece; 22. a limiting groove; 23. a discharge port; 24. a positioning column; 25. blocking edges; 26. a fixing buckle; 27. a bayonet; 28. a thin rope; 29. a return spring; 30. a pressing plate; 31. a circular groove; 32. a limiting ring; 33. fixing the spring; 34. connecting holes; 35. a card slot; 36. and (7) a gasket.
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. 1-9, the present invention provides a technical solution: a magnetic powder detection device for detecting metal cracks comprises a machine body 7 and a buffer mechanism, wherein a groove body 2 is fixedly connected to the top of the front end of the machine body 7, a hydraulic telescopic rod 10 is fixedly connected to the top of the inside of the machine body 7, a fixing frame 9 is fixedly connected to the end of the hydraulic telescopic rod 10, the fixing frame 9 is installed at the top end of the groove body 2, a guide plate 8 is fixedly connected to the inside of the machine body 7, the end of the guide plate 8 is installed at the top of the inner end of the groove body 2, an accommodating groove 15 is formed in the outer side surface of the guide plate 8, the buffer mechanism comprises a limiting plate 14, the limiting plate 14 is installed inside the accommodating groove 15, a rotating shaft 17 is fixedly connected to the inner walls of the bottoms of the limiting plate 14 and the accommodating groove 15, the rotating shaft 17 is installed inside the top end of the accommodating groove 15, an elastic sheet 16 is fixedly connected to the inner walls of the top, the torsion spring 18 is installed inside the receiving groove 15, and the stopper plate 14 is perpendicular to the receiving groove 15.
In order to facilitate the use of controlling of magnetic particle detection device, in this embodiment, preferably, one side outer wall fixedly connected with electric cabinet 1 of organism 7, the equal fixedly connected with electrical control button 3 in front end both sides of organism 7, storing groove 11 has been seted up on the front end surface of organism 7, discharge gate 23 has been seted up on the rear end surface of organism 7, the other end of deflector 8 is fixed in the port bottom of discharge gate 23.
In order to facilitate the control of the rotation and inclination of the cover plate 6, in this embodiment, preferably, the cover plate 6 is arranged outside the port of the storage tank 11, the hinge 5 is fixedly connected to the inner wall of the bottom of the cover plate 6 and the storage tank 11, the outer side surface of the cover plate 6 is flush with the front end surface of the machine body 7, and the handle 4 is arranged outside the top end of the cover plate 6.
In order to facilitate the cover plate 6 to be fixed at the end of the storage groove 11, in this embodiment, preferably, a magnetic seat 12 is fixedly connected to the inner wall of the top of the storage groove 11, a magnetic buckle 13 is fixedly connected to the inner side of the top end of the cover plate 6, the magnetic buckle 13 and the magnetic seat 12 correspond to each other and are in a straight line, and the end surfaces of the magnetic buckle 13 and the magnetic seat 12 are attached to each other.
In order to facilitate the collection and arrangement of the workpieces, in this embodiment, preferably, the machine body 7 has a square groove 19 formed in the bottom end of the discharge hole 23, the bottom inner wall of the square groove 19 is fixedly connected with a crosspiece 21, the square groove 19 is provided with a storage plate 20 inside the top end of the crosspiece 21, and the outer walls of two sides of the storage plate 20 are fixedly connected with flanges 25.
In order to facilitate recycling of the positioning column 24, in this embodiment, preferably, circular grooves 31 are formed in both sides of the inner end of the object placing plate 20, the positioning column 24 is arranged inside the circular groove 31, the cross section of the positioning column 24 is of a "T" shaped structure, and a fixing spring 33 is fixedly connected between the end surface of the positioning column 24 and the inner side inner wall of the circular groove 31.
In order to facilitate the rotation and expansion of the object placing plate 20, in this embodiment, preferably, the inner walls of the two sides of the square groove 19 are both provided with a limiting groove 22, the limiting groove 22 and the circular groove 31 correspond to each other and are on the same straight line, the port of the circular groove 31 is fixedly connected with a limiting ring 32, and the end of the positioning column 24 penetrates through the limiting ring 32 and is fixed in the limiting groove 22.
In order to facilitate the fixing of the pressing plate 30, in this embodiment, preferably, the outer end surface of the object placing plate 20 is provided with a bayonet 27, a connecting hole 34 is formed between the bayonet 27 and the circular groove 31, the connecting hole 34 is formed inside the object placing plate 20, the pressing plate 30 is arranged inside the inner end of the bayonet 27, and the inner wall of the pressing plate 30 and the inner wall of the bayonet 27 is fixedly connected with a return spring 29.
In order to facilitate the control of the displacement of the positioning column 24, in this embodiment, it is preferable that a thin rope 28 is provided inside the connecting hole 34, the bayonet 27, the connecting hole 34 and the circular groove 31 are communicated with each other, one end of the thin rope 28 is fixed to an outer wall of an end portion of the pressing plate 30, and the other end of the thin rope 28 is fixed to an inner end surface of the positioning column 24.
In order to facilitate the object placing plate 20 to be fixed inside the square groove 19, in this embodiment, preferably, the clamping groove 35 is formed in the inner side of the top of the square groove 19, the gasket 36 is fixedly connected to the inner side wall of the clamping groove 35, the fixing buckle 26 is fixedly connected to the inner side of the outer end of the object placing plate 20, the fixing buckle 26 and the clamping groove 35 correspond to each other and are on the same straight line, the fixing buckle 26 is installed inside the clamping groove 35, and the end face of the fixing buckle 26 is attached to the surface of the gasket 36.
The working principle and the using process of the invention are as follows: after the device is installed, the handle 4 controls the cover plate 6 to rotate and incline towards the outer side through the hinge 5, maintenance tools and replacement parts are placed in the storage groove 11 in advance, the cover plate 6 is fixed at the port of the storage groove 11 through the magnetic attraction of the magnetic buckle 13 and the magnetic seat 12, tools for timely taking are convenient to maintain and repair the machine body 7, the object placing plate 20 is stored in the square groove 19 through the fixing buckle 26 in daily life, the fixing buckle 26 is installed in the clamping groove 35 and is attached to the gasket 36 of the inner side inner wall, the object placing plate 20 rotates and expands through the positioning column 24 as a shaft, the object placing plate 20 is clamped with the crosspiece 21 of the inner wall at the bottom of the square groove 19 to be horizontally expanded, the object placing plate 20 is convenient for detecting and completing the collection of workpieces, the retaining edges 25 on the outer walls at two sides of the object placing plate 20 prevent the workpieces from sliding down, the pressing plate 30 inside the bayonet 27 at, the thin rope 28 slides inside the object placing plate 20 along the connecting hole 34, the positioning column 24 contracts to the inside of the circular groove 31 under the action of tensile force, the object placing plate 20 can be taken out from the inside of the square groove 19, the workpiece on the object placing plate 20 can be conveniently stored and sorted, the workpiece is detected and conveyed to the discharge hole 23 by the guide plate 8, the outer limiting plate 14 of the guide plate 8 is in contact with the workpiece in the falling process of the workpiece, the limiting plate 14 slows down the impact generated in the falling process of the workpiece, the limiting plate 14 rotates downwards and inclines through the rotating shaft 17, the limiting plate 14 upwards rotates and resets through the pushing of the torsion spring 18, the limiting plate 14 avoids being in linear collision with the workpiece, the elastic sheet 16 covers the top ports of the limiting plate 14 and the storage groove 15, and.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A magnetic particle detection device for surveying metal crack, including organism (7) and buffer gear, its characterized in that: the structure is characterized in that the top of the front end of the machine body (7) is fixedly connected with a groove body (2), the top of the inner part of the machine body (7) is fixedly connected with a hydraulic telescopic rod (10), the end part of the hydraulic telescopic rod (10) is fixedly connected with a fixing frame (9), the fixing frame (9) is arranged at the top end of the groove body (2), the inner part of the machine body (7) is fixedly connected with a guide plate (8), the end part of the guide plate (8) is arranged at the top of the inner end of the groove body (2), the outer side surface of the guide plate (8) is provided with a containing groove (15), the buffering mechanism comprises a limiting plate (14), the limiting plate (14) is arranged inside the containing groove (15), the limiting plate (14) and the inner wall of the bottom of the containing groove (15) are fixedly connected with a rotating shaft (17), the rotating shaft (17) is arranged inside the top end of the containing groove (15), the limiting plate (14, the inner bottom fixedly connected with torsional spring (18) of limiting plate (14), the other end of torsional spring (18) is fixed at the bottom inner wall of accomodating groove (15), torsional spring (18) are installed in the inside of accomodating groove (15), limiting plate (14) and take in between groove (15) mutually perpendicular.
2. The magnetic powder inspection device for inspecting metal cracks of claim 1, wherein: the utility model discloses a portable electronic device, including organism (7), the equal fixedly connected with electric cabinet (1) in one side outer wall fixedly connected with of organism (7), the equal fixedly connected with electric control button (3) in front end both sides of organism (7), storing groove (11) have been seted up on the front end surface of organism (7), discharge gate (23) have been seted up on the rear end surface of organism (7), the port bottom at discharge gate (23) is fixed to the other end of deflector (8).
3. The magnetic powder inspection device for inspecting metal cracks according to claim 2, wherein: the port outside in storing groove (11) is provided with apron (6), the bottom inner wall fixedly connected with hinge (5) of apron (6) and storing groove (11), the outside surface of apron (6) and the front end surface parallel and level each other of organism (7), handle (4) have been seted up in the top outside of apron (6).
4. The magnetic powder inspection device for inspecting metal cracks according to claim 3, wherein: the top inner wall fixedly connected with magnetism seat (12) of storing groove (11), inboard fixedly connected with magnetism in top of apron (6) is detained (13), magnetism is detained (13) and is corresponded each other and on a straight line with magnetism seat (12), the terminal surface of magnetism knot (13) and magnetism seat (12) is laminated each other.
5. The magnetic powder inspection device for inspecting metal cracks according to claim 2, wherein: organism (7) have seted up square groove (19) in the bottom of discharge gate (23), the bottom inner wall fixedly connected with crosspiece (21) of square groove (19), square groove (19) are provided with in the top of crosspiece (21) inside and put thing board (20), the equal fixedly connected with flange (25) of both sides outer wall of putting thing board (20).
6. The magnetic powder inspection device for inspecting metal cracks of claim 5, wherein: circular slot (31) have all been seted up to the inner both sides of putting thing board (20), the inside of circular slot (31) is provided with reference column (24), the cross section of reference column (24) is "T" font structure, the terminal surface of reference column (24) and the inboard inner wall fixedly connected with fixed spring (33) of circular slot (31).
7. The magnetic particle inspection device for inspecting metal cracks of claim 6, wherein: spacing groove (22) have all been seted up to the both sides inner wall of square groove (19), spacing groove (22) and circular slot (31) correspond each other and on a straight line, the port fixedly connected with spacing ring (32) of circular slot (31), the tip of reference column (24) runs through spacing ring (32) and fixes the inside at spacing groove (22).
8. The magnetic particle inspection device for inspecting metal cracks of claim 6, wherein: the article placing plate is characterized in that a bayonet (27) is formed in the outer end surface of the article placing plate (20), a connecting hole (34) is formed between the bayonet (27) and the circular groove (31), the connecting hole (34) is formed in the article placing plate (20), a pressing plate (30) is arranged inside the inner end of the bayonet (27), and a reset spring (29) is fixedly connected with the inner side wall of the pressing plate (30) and the inner side wall of the bayonet (27).
9. The magnetic powder inspection device for inspecting metal cracks of claim 8, wherein: a thin rope (28) is arranged inside the connecting hole (34), the bayonet (27), the connecting hole (34) and the circular groove (31) are communicated with each other, one end of the thin rope (28) is fixed to the outer wall of the end portion of the pressing plate (30), and the other end of the thin rope (28) is fixed to the inner end surface of the positioning column (24).
10. The magnetic powder inspection device for inspecting metal cracks of claim 5, wherein: draw-in groove (35) have been seted up to the top inboard of square groove (19), inboard inner wall fixedly connected with gasket (36) of draw-in groove (35), put the inboard fixedly connected with of outer end of thing board (20) and fix knot (26), fix knot (26) and draw-in groove (35) and correspond each other and on a straight line, the inside at draw-in groove (35) is installed in fixed knot (26), the terminal surface of fixed knot (26) is laminated each other with the surface of gasket (36).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911247720.7A CN110823994A (en) | 2019-12-09 | 2019-12-09 | Magnetic powder detecting device for detecting metal cracks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911247720.7A CN110823994A (en) | 2019-12-09 | 2019-12-09 | Magnetic powder detecting device for detecting metal cracks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110823994A true CN110823994A (en) | 2020-02-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911247720.7A Withdrawn CN110823994A (en) | 2019-12-09 | 2019-12-09 | Magnetic powder detecting device for detecting metal cracks |
Country Status (1)
| Country | Link |
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| CN (1) | CN110823994A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632740A (en) * | 2020-05-25 | 2020-09-08 | 上海佑艾健康科技有限公司 | Primary preparation machine for traditional Chinese medicine powder for health preservation |
| CN111740537A (en) * | 2020-05-27 | 2020-10-02 | 江苏金丰机电有限公司 | Integrated switched reluctance motor flywheel energy storage device |
| CN111789597A (en) * | 2020-06-17 | 2020-10-20 | 上海恒光警用器材有限公司 | Evidence obtaining device for flattening curved surface material evidence image |
| CN111815872A (en) * | 2020-08-13 | 2020-10-23 | 上海贵蓉国际物流有限公司 | Intelligent logistics cabinet and article circulation information management device |
| CN111982547A (en) * | 2020-08-21 | 2020-11-24 | 胡宗杨 | Controllable resistor experimental device for rail transit |
-
2019
- 2019-12-09 CN CN201911247720.7A patent/CN110823994A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632740A (en) * | 2020-05-25 | 2020-09-08 | 上海佑艾健康科技有限公司 | Primary preparation machine for traditional Chinese medicine powder for health preservation |
| CN111740537A (en) * | 2020-05-27 | 2020-10-02 | 江苏金丰机电有限公司 | Integrated switched reluctance motor flywheel energy storage device |
| CN111789597A (en) * | 2020-06-17 | 2020-10-20 | 上海恒光警用器材有限公司 | Evidence obtaining device for flattening curved surface material evidence image |
| CN111815872A (en) * | 2020-08-13 | 2020-10-23 | 上海贵蓉国际物流有限公司 | Intelligent logistics cabinet and article circulation information management device |
| CN111982547A (en) * | 2020-08-21 | 2020-11-24 | 胡宗杨 | Controllable resistor experimental device for rail transit |
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Application publication date: 20200221 |