CN214899411U - Box-type transformer dust collector - Google Patents
Box-type transformer dust collector Download PDFInfo
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- CN214899411U CN214899411U CN202121430700.6U CN202121430700U CN214899411U CN 214899411 U CN214899411 U CN 214899411U CN 202121430700 U CN202121430700 U CN 202121430700U CN 214899411 U CN214899411 U CN 214899411U
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- gear
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- fixedly arranged
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- 239000000428 dust Substances 0.000 title claims abstract description 59
- 239000002023 wood Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 5
- 241000883990 Flabellum Species 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 230000000295 complement effect Effects 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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Abstract
The utility model discloses a box transformer dust collector, its technical scheme is: the power distribution box comprises a box body, the fixed transformer body that is equipped with in box inner chamber bottom one side, the inside complementary unit that is equipped with of box, complementary unit includes the motor, inside the box was located to the motor, a fixed L shaped plate that is equipped with of box inner chamber lateral wall, the beneficial effects of the utility model are that: through complementary unit's design, can remove through the framework and drive first fixed plate and remove the indirect second fixed plate that drives and remove, consequently, can collect the dust when the framework removes and through the design of blade, can scrape into the dust and collect inside the frame, remove when the framework opposite then can carry out the inside effect of discharge box with the dust, the work content of not only having saved the manual work and having cleaned, and realize equipment integration, realize the effect of the inside dust removal of box, in order to solve in the past that equipment removes dust not thorough and the dust still exists in the inside problem of box.
Description
Technical Field
The utility model relates to a box transformer technical field, concretely relates to box transformer dust collector.
Background
The box-type transformer (generally referred to as a box transformer) is characterized in that the traditional transformer is intensively designed in a box-type shell, has small volume, light weight, low noise, low loss and high reliability, is widely applied to residential districts, business centers, light stations, airports, factories and mines, enterprises, hospitals, schools and other places, has the advantages of small occupied space, convenience in operation, high application benefits, flexible combination mode, high operation safety and the like, is widely applied to various fields, and becomes important power equipment which is indispensable in the construction of the current power engineering.
The prior art has the following defects: the existing box-type transformer dust removal device can only simply clean the top of the transformer inside a box body when the transformer is subjected to dust removal, meanwhile, dust after cleaning still exists in the box body, the effect of dust removal is difficult to thoroughly carry out, and when a worker opens a box door, the dust can be scattered out due to the influence of wind power, so that dust on the upper part of the surface of a transformer body can fall off, and dust removal is not in place.
Therefore, the invention is necessary to develop a box type transformer dust removal device.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a box transformer dust collector, design through complementary unit, can remove through the framework and drive first fixed plate and remove and drive the second fixed plate indirectly and remove, therefore, can collect the dust when the framework removes and through the design of blade, can scrape the dust and collect inside the frame, remove when the framework is opposite then can discharge the inside effect of box with the dust, the work content of artifical cleaning has not only been saved, and realize equipment integration, realize the inside effect of removing dust of box, in order to solve in the past equipment dust removal not thorough and the dust still exists in the inside problem of box.
In order to achieve the above object, the present invention provides the following technical solutions: a box-type transformer dust removal device comprises a box body, wherein a transformer body is fixedly arranged on one side of the bottom of an inner cavity of the box body, and an auxiliary mechanism is arranged inside the box body;
the auxiliary mechanism comprises a motor, the motor is arranged in the box body, an L-shaped plate is fixedly arranged on one side wall of an inner cavity of the box body, the motor is fixedly arranged at the top of the L-shaped plate, the motor is fixedly connected with a rotating rod through an output shaft, a reciprocating lead screw is fixedly arranged at one end of the rotating rod, a bearing seat is arranged outside the reciprocating lead screw, the reciprocating lead screw is connected with the bearing seat through a ball nut pair, a frame body is fixedly arranged at the bottom of the bearing seat, the auxiliary mechanism further comprises an auxiliary assembly and an auxiliary unit, the auxiliary assembly is arranged in the box body, and the auxiliary unit is arranged at the bottom of the box body;
the auxiliary assembly comprises a fixing rod, the fixing rod is arranged inside the box body, one end of the fixing rod extends to the inner portion of the rear side wall of the inner cavity of the box body and is connected with the box body through a bearing, a first gear is fixedly arranged on the outer portion of the fixing rod, and a first fixing plate and a second fixing plate are arranged at the top and the bottom of the first gear respectively.
Preferably, the dwang external fixation is equipped with the second gear, the dwang bottom is equipped with square telescopic link, the fixed block that is equipped with in inner chamber of the box one side, square telescopic link extends to the block inside and passes through the bearing with the block and be connected, square telescopic link external fixation is equipped with the third gear, the third gear is located second gear bottom and meshes mutually with the second gear, the dwang runs through the L shaped plate and passes through the bearing with the L shaped plate and be connected, the fixed riser that is equipped with in inner chamber of the box top, reciprocal lead screw extends to the riser inside and passes through the bearing with the riser and be connected.
Preferably, the fixed backup pad that is equipped with in box inner chamber top, the dead lever extends to inside and passes through the bearing with the backup pad and be connected, first fixed plate bottom and second fixed plate top are fixed respectively and are equipped with first rack and second rack, first gear top and bottom and mesh with first gear respectively are located to first rack and second rack, a fixed blade that is equipped with of box inner chamber lateral wall, the blade rear side is all located with first fixed plate and second fixed plate to the backup pad, the fixed diaphragm that is equipped with in second fixed plate front side, the fixed push pedal that is equipped with in diaphragm bottom, the fixed collection frame that is equipped with in box inner chamber bottom.
Preferably, the push plate extends to the inside of the collecting frame and is in contact with the bottom of an inner cavity of the collecting frame, a discharging pipe is embedded in one side of the collecting frame and extends out of the bottom of the box body, a sliding block is fixedly arranged on the rear side of the second fixing plate, a sliding groove is formed in the rear side wall of the inner cavity of the box body, and the sliding block extends to the inside of the sliding groove.
Preferably, the square telescopic rod extends to the inside of the frame body and is connected with the frame body through a bearing, a first bevel gear is fixedly arranged at one end of the square telescopic rod, a movable rod is arranged on one side of the first bevel gear, the movable rod extends to the top of an inner cavity of the frame body and is connected with the frame body through a bearing, a plurality of fan blades are fixedly arranged on the outer portion of the movable rod, an air outlet is formed in one side of the frame body, a filter screen is fixedly arranged at the bottom of the frame body, one side of a first fixing plate is fixedly connected with one side of the filter screen, the first bevel gear and a second bevel gear are both arranged in the frame body, a connecting plate is fixedly arranged on the rear side wall of the inner cavity of the box body, and a third rack is fixedly arranged on the front side of the connecting plate.
Preferably, a moving plate is fixedly arranged on one side of the frame body, a connecting rod is arranged in the moving plate, the connecting rod extends out of the connecting plate and is connected with the moving plate through a bearing, a fourth gear is fixedly arranged on the outer portion of the connecting rod, and the fourth gear is arranged on the front side of the third rack and meshed with the third rack.
Preferably, a wood board is fixedly arranged at the bottom of the connecting rod, a brush is fixedly arranged at the bottom of the wood board, and the bottom of the brush is in contact with the top of the transformer body.
Preferably, the front side of the box body is provided with a movable door, the movable door is connected with the box body through a hinge, and the front side of the movable door is fixedly provided with a handle.
Preferably, the auxiliary unit comprises four supporting blocks, and the four supporting blocks are respectively fixedly arranged at four corners of the bottom of the box body.
Preferably, the auxiliary unit comprises four supporting rods, and the four supporting rods are respectively fixedly arranged at four corners of the bottom of the box body.
The utility model has the advantages that:
1. the utility model discloses a simple structural design, can drive the framework and move when the thread piece moves, the framework moves and drives the movable plate and move, the movable plate moves and drives the connecting rod and rotate, the connecting rod rotates and drives fourth gear rotation, fourth gear rotation indirectly drives the brush and rotates and cleans the dust to the transformer body, makes the dust raise, and the filter screen collects the dust simultaneously, on the one hand, can reach the effect of cleaning the dust, on the other hand, also can collect the dust;
2. the utility model discloses an auxiliary mechanism's design can move through the framework and drive first fixed plate and remove and indirectly drive the second fixed plate and remove, consequently, can collect the dust when the framework removes and through the design of blade, can scrape into the collection frame with the dust inside, remove when the framework is opposite then can carry out the inside effect of discharge box with the dust, not only saved the work content of artifical cleaning, realize equipment integration moreover, realize the effect of the inside dust removal of box.
Drawings
FIG. 1 is a perspective view of the overall structure provided by the present invention;
fig. 2 is a schematic view of the overall structure provided by the present invention;
fig. 3 is a top cross-sectional view of the fixing rod provided by the present invention;
fig. 4 is a schematic view of the overall structure of embodiment 2 provided by the present invention;
in the figure: the device comprises a box body 1, a transformer body 2, a motor 3, a 4L-shaped plate, a 5 rotating rod, a 6 reciprocating screw rod, a 7 bearing seat, a 8 frame body, a 9 fixing rod, a 10 first gear, a 11 first fixing plate, a 12 second fixing plate, a 13 square telescopic rod, a 14 third gear, a 15 second rack, a 16 transverse plate, a 17 collecting frame, a 18 connecting plate, a 19 connecting rod, a 20 fourth gear, a 21 movable door, a 22 supporting block and a 23 supporting rod.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
the auxiliary mechanism comprises a motor 3, the motor 3 is arranged in a box body 1, an L-shaped plate 4 is fixedly arranged on one side wall of an inner cavity of the box body 1, the motor 3 is fixedly arranged at the top of the L-shaped plate 4, the motor 3 is fixedly connected with a rotating rod 5 through an output shaft, one end of the rotating rod 5 is fixedly provided with a reciprocating screw rod 6, a bearing seat 7 is arranged outside the reciprocating screw rod 6, the reciprocating screw rod 6 is connected with the bearing seat 7 through a ball nut pair, a frame body 8 is fixedly arranged at the bottom of the bearing seat 7, the auxiliary mechanism further comprises an auxiliary assembly and an auxiliary unit, the auxiliary assembly is arranged in the box body 1, and the auxiliary unit is arranged at the bottom of the box body 1;
the auxiliary assembly comprises a fixing rod 9, the fixing rod 9 is arranged in the box body 1, one end of the fixing rod 9 extends into the rear side wall of the inner cavity of the box body 1 and is connected with the box body 1 through a bearing, a first gear 10 is fixedly arranged outside the fixing rod 9, and the top and the bottom of the first gear 10 are respectively provided with a first fixing plate 11 and a second fixing plate 12;
further, a second gear is fixedly arranged outside the rotating rod 5, a square telescopic rod 13 is arranged at the bottom of the rotating rod 5, a block body is fixedly arranged on one side of an inner cavity of the box body 1, the square telescopic rod 13 extends into the block body and is connected with the block body through a bearing, a third gear 14 is fixedly arranged outside the square telescopic rod 13, the third gear 14 is arranged at the bottom of the second gear and is meshed with the second gear, the rotating rod 5 penetrates through the L-shaped plate 4 and is connected with the L-shaped plate 4 through the bearing, a vertical plate is fixedly arranged at the top of the inner cavity of the box body 1, and the reciprocating screw rod 6 extends into the vertical plate and is connected with the vertical plate through the bearing, so that the square telescopic rod 13 can rotate conveniently and the reciprocating screw rod 6 can support conveniently;
furthermore, a supporting plate is fixedly arranged at the top of an inner cavity of the box body 1, the fixing rod 9 extends into the supporting plate and is connected with the supporting plate through a bearing, a first rack and a second rack 15 are fixedly arranged at the bottom of the first fixing plate 11 and the top of the second fixing plate 12 respectively, the first rack and the second rack 15 are respectively arranged at the top and the bottom of the first gear 10 and are meshed with the first gear 10, a blade is fixedly arranged on one side wall of the inner cavity of the box body 1, the supporting plate, the first fixing plate 11 and the second fixing plate 12 are arranged at the rear side of the blade, a transverse plate 16 is fixedly arranged at the front side of the second fixing plate 12, a pushing plate is fixedly arranged at the bottom of the transverse plate 16, and a collecting frame 17 is fixedly arranged at the bottom of the inner cavity of the box body 1, so that the fixing rod 9 is supported, the pushing plate is convenient to move, and dust is convenient to collect;
furthermore, the push plate extends into the collecting frame 17 and contacts with the bottom of the inner cavity of the collecting frame 17, a discharge pipe is embedded in one side of the collecting frame 17 and extends out of the bottom of the box body 1, a sliding block is fixedly arranged on the rear side of the second fixing plate 12, a sliding groove is formed in the rear side wall of the inner cavity of the box body 1, and the sliding block extends into the sliding groove, so that discharging is facilitated, and the second fixing plate 12 is convenient to support and move;
further, the square telescopic rod 13 extends into the frame body 8 and is connected with the frame body 8 through a bearing, a first bevel gear is fixedly arranged at one end of the square telescopic rod 13, a movable rod is arranged at one side of the first bevel gear, the movable rod extends to the top of an inner cavity of the frame body 8 and is connected with the frame body 8 through a bearing, a plurality of fan blades are fixedly arranged outside the movable rod, an air outlet is formed in one side of the frame body 8, a filter screen is fixedly arranged at the bottom of the frame body 8, one side of the first fixing plate 11 is fixedly connected with one side of the filter screen, the first bevel gear and the second bevel gear are both arranged in the frame body 8, a connecting plate 18 is fixedly arranged on the rear side wall of the inner cavity of the box body 1, a third rack is fixedly arranged on the front side of the connecting plate 18, the movable rod can rotate conveniently, and the first fixing plate 11 can be fixed conveniently;
furthermore, a moving plate is fixedly arranged on one side of the frame body 8, a connecting rod 19 is arranged inside the moving plate, the connecting rod 19 extends out of the connecting plate 18 and is connected with the moving plate through a bearing, a fourth gear 20 is fixedly arranged outside the connecting rod 19, and the fourth gear 20 is arranged on the front side of the third rack and is meshed with the third rack, so that the connecting rod 19 can rotate conveniently;
furthermore, a wood board is fixedly arranged at the bottom of the connecting rod 19, a brush is fixedly arranged at the bottom of the wood board, and the bottom of the brush is in contact with the top of the transformer body 2, so that the brush can rotate conveniently;
furthermore, a movable door 21 is arranged on the front side of the box body 1, the movable door 21 is connected with the box body 1 through a hinge, and a handle is fixedly arranged on the front side of the movable door 21 so as to facilitate pulling of the movable door 21;
further, the auxiliary unit comprises four supporting blocks 22, and the four supporting blocks 22 are respectively fixedly arranged at four corners of the bottom of the box body 1, so that the box body 1 is conveniently supported.
The utility model discloses a use as follows: when the utility model is used, firstly, the utility model is connected with an external power supply, when dust needs to be cleaned and collected, the motor 3 is turned on, the motor 3 rotates to drive the rotating rod 5 to rotate, the rotating rod 5 rotates to drive the reciprocating screw rod 6 to rotate, the reciprocating screw rod 6 rotates to drive the bearing seat 7 to move, the bearing seat 7 moves to drive the frame body 8 to move, the frame body 8 moves to drive the moving plate to move, the moving plate moves to drive the connecting rod 19 to move, the connecting rod 19 moves to drive the fourth gear 20 to rotate, the fourth gear 20 rotates to drive the moving rod to rotate, the moving rod rotates to drive the wood plate to rotate, the wood plate rotates to drive the brush to rotate, the brush rotates to raise dust, meanwhile, the second gear rotates to drive the third gear 14 to rotate, the third gear 14 rotates to drive the square telescopic rod 13 to rotate, the square telescopic rod 13 rotates to drive the first bevel gear to rotate, the first bevel gear rotates to drive the second bevel gear to rotate, the second bevel gear rotates to drive the movable rod to rotate, the movable rod rotates to drive the fan blades to rotate, the fan blades rotate to adsorb the raised dust, when the dust is adsorbed to the filter screen and contacts with the blade, the dust is scraped to the inside of the collecting frame 17 by the blade, at this time, the push plate moves to one side of the collecting frame 17, thereby achieving the effect of sweeping and collecting the dust, when the dust in the dust collector needs to be discharged, the filter screen removes and drives first fixed plate 11 and removes, first fixed plate 11 removes and drives first rack and remove, first rack removes and drives first gear 10 and rotate, first gear 10 rotates and drives second rack 15 opposite movement, second rack 15 removes and drives second fixed plate 12 and remove, second fixed plate 12 removes and drives diaphragm 16 and remove, diaphragm 16 removes and drives the push pedal and removes, the push pedal is removed and is pushed away the dust to 1 outsidely through the discharging pipe to the box, thereby reach and carry out the exhaust effect to inside dust.
The utility model discloses a use as follows: when using the utility model discloses the time, four branches 23 support box 1 to be convenient for the falling out of dust.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solutions described above. Therefore, any simple modifications or equivalent replacements made according to the technical solution of the present invention belong to the scope of the claimed invention as far as possible.
Claims (10)
1. The utility model provides a box transformer dust collector, includes box (1), its characterized in that: a transformer body (2) is fixedly arranged on one side of the bottom of the inner cavity of the box body (1), and an auxiliary mechanism is arranged in the box body (1);
the auxiliary mechanism comprises a motor (3), the motor (3) is arranged inside the box body (1), an L-shaped plate (4) is fixedly arranged on one side wall of an inner cavity of the box body (1), the motor (3) is fixedly arranged at the top of the L-shaped plate (4), the motor (3) is fixedly connected with a rotating rod (5) through an output shaft, a reciprocating lead screw (6) is fixedly arranged at one end of the rotating rod (5), a bearing seat (7) is arranged outside the reciprocating lead screw (6), the reciprocating lead screw (6) is connected with the bearing seat (7) through a ball nut pair, a frame body (8) is fixedly arranged at the bottom of the bearing seat (7), the auxiliary mechanism further comprises an auxiliary assembly and an auxiliary unit, the auxiliary assembly is arranged inside the box body (1), and the auxiliary unit is arranged at the bottom of the box body (1);
the auxiliary assembly comprises a fixing rod (9), the fixing rod (9) is arranged inside the box body (1), one end of the fixing rod (9) extends to the inner cavity rear side wall of the box body (1) and is connected with the box body (1) through a bearing, a first gear (10) is arranged on the fixing rod (9) in the outer portion, and a first fixing plate (11) and a second fixing plate (12) are arranged at the top and the bottom of the first gear (10) respectively.
2. The box-type transformer dust removing device according to claim 1, characterized in that: dwang (5) external fixation is equipped with the second gear, dwang (5) bottom is equipped with square telescopic link (13), box (1) inner chamber one side is fixed and is equipped with the block, square telescopic link (13) extend to the block inside and pass through the bearing with the block and be connected, square telescopic link (13) external fixation is equipped with third gear (14), third gear (14) are located second gear bottom and are meshed with the second gear mutually, dwang (5) run through L shaped plate (4) and are connected through the bearing with L shaped plate (4), box (1) inner chamber top is fixed and is equipped with the riser, reciprocal lead screw (6) extend to the riser inside and pass through the bearing with the riser and be connected.
3. The box-type transformer dust removing device according to claim 1, characterized in that: the fixed backup pad that is equipped with in box (1) inner chamber top, dead lever (9) extend to the backup pad inside and pass through the bearing with the backup pad and be connected, first fixed plate (11) bottom and second fixed plate (12) top are fixed respectively and are equipped with first rack and second rack (15), first gear (10) top and bottom and mesh mutually with first gear (10) are located respectively to first rack and second rack (15), box (1) inner chamber lateral wall is fixed and is equipped with the blade, the blade rear side is all located with first fixed plate (11) and second fixed plate (12) to the backup pad, second fixed plate (12) front side is fixed and is equipped with diaphragm (16), diaphragm (16) bottom is fixed and is equipped with the push pedal, box (1) inner chamber bottom is fixed and is equipped with collection frame (17).
4. The box-type transformer dust removing device according to claim 3, wherein: the push pedal extends to and collects frame (17) inside and contact with collection frame (17) inner chamber bottom, it inlays on one side of frame (17) and is equipped with the discharging pipe, the discharging pipe extends box (1) bottom, the fixed slider that is equipped with in second fixed plate (12) rear side, the spout has been seted up to box (1) inner chamber rear side wall, the slider extends to inside the spout.
5. The box-type transformer dust removing device according to claim 2, characterized in that: the utility model discloses a box, including box (8), square telescopic link (13), movable rod, box (8), frame (8), box (1), connecting plate (18) front side is fixed and is equipped with the third rack, square telescopic link (13) one end is fixed and is equipped with first bevel gear, first bevel gear one side is equipped with the movable rod, the movable rod extends to frame (8) inner chamber top and is connected through the bearing with frame (8), the movable rod external fixation is equipped with a plurality of flabellums, the air outlet has been seted up to frame (8) one side, the fixed filter screen that is equipped with in frame (8) bottom, first fixed plate (11) one side and filter screen one side fixed connection, inside frame (8) was all located to first bevel gear and second bevel gear, box (1) inner chamber rear side wall is fixed and is equipped with connecting plate (18), the fixed third rack that is equipped with in connecting plate (18) front side.
6. The box-type transformer dust removing device according to claim 5, wherein: the movable plate is fixedly arranged on one side of the frame body (8), a connecting rod (19) is arranged inside the movable plate, the connecting rod (19) extends out of the connecting plate (18) and is connected with the movable plate through a bearing, a fourth gear (20) is fixedly arranged outside the connecting rod (19), and the fourth gear (20) is arranged on the front side of the third rack and meshed with the third rack.
7. The box-type transformer dust removing device according to claim 6, wherein: the transformer is characterized in that a wood board is fixedly arranged at the bottom of the connecting rod (19), a brush is fixedly arranged at the bottom of the wood board, and the bottom of the brush is in contact with the top of the transformer body (2).
8. The box-type transformer dust removing device according to claim 1, characterized in that: the refrigerator is characterized in that a movable door (21) is arranged on the front side of the refrigerator body (1), the movable door (21) is connected with the refrigerator body (1) through a hinge, and a handle is fixedly arranged on the front side of the movable door (21).
9. The box-type transformer dust removing device according to claim 1, characterized in that: the auxiliary unit comprises four supporting blocks (22), and the four supporting blocks (22) are respectively fixedly arranged at four corners of the bottom of the box body (1).
10. The box-type transformer dust removing device according to claim 1, characterized in that: the auxiliary unit comprises four supporting rods (23), and the four supporting rods (23) are respectively fixedly arranged at four corners of the bottom of the box body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121430700.6U CN214899411U (en) | 2021-06-26 | 2021-06-26 | Box-type transformer dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121430700.6U CN214899411U (en) | 2021-06-26 | 2021-06-26 | Box-type transformer dust collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214899411U true CN214899411U (en) | 2021-11-26 |
Family
ID=78930695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121430700.6U Expired - Fee Related CN214899411U (en) | 2021-06-26 | 2021-06-26 | Box-type transformer dust collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214899411U (en) |
-
2021
- 2021-06-26 CN CN202121430700.6U patent/CN214899411U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211126 |