CN214441844U - Support roll of rolling mill - Google Patents
Support roll of rolling mill Download PDFInfo
- Publication number
- CN214441844U CN214441844U CN202120631929.XU CN202120631929U CN214441844U CN 214441844 U CN214441844 U CN 214441844U CN 202120631929 U CN202120631929 U CN 202120631929U CN 214441844 U CN214441844 U CN 214441844U
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- Prior art keywords
- fixedly connected
- wall
- side end
- arc
- square
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000005096 rolling process Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000004140 cleaning Methods 0.000 claims abstract description 49
- 238000003860 storage Methods 0.000 claims abstract description 29
- 238000005498 polishing Methods 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims description 17
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 238000005192 partition Methods 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 7
- 239000002893 slag Substances 0.000 abstract description 11
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 239000000428 dust Substances 0.000 description 8
- 238000005406 washing Methods 0.000 description 7
- 238000000151 deposition Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 244000309464 bull Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The utility model discloses a rolling mill backing roll, which comprises a base, wherein both sides of the outer wall of the top end of the base are fixedly connected with a lifting seat, the top end of the lifting seat is fixedly connected with a lifting rod, the top end of the lifting rod is fixed with a backing roll through a rotating shaft seat, the lower part of the backing roll is provided with a cleaning device, the cleaning device comprises a water storage tank, the outer wall of the top end of the water storage tank is fixedly connected with an arc clamping frame, the outer wall of the top end of the arc clamping frame is provided with an arc groove, the arc groove is matched with the backing roll for use, the right side end of the bottom end of the arc clamping frame is provided with a transfer case, both sides of the inner wall of the bottom end of the arc groove are fixedly connected with a cleaning nozzle, the other end of the cleaning nozzle is fixedly connected with the outer wall of the transfer case, the upper part of the inner wall of the left side end of the arc groove is fixed with a polishing block, the upper part of the inner wall of the right side end of the arc groove is fixed with a cleaning brush, the polishing block is matched with the cleaning brush and the backing roll for use, the cleaning brush, thereby preventing the slag from influencing the finish of the subsequent steel.
Description
Technical Field
The utility model relates to a rolling mill equipment technical field specifically is a rolling mill backing roll.
Background
The rolling mill is equipment for realizing the metal rolling process, and generally refers to equipment for completing the whole process of rolled material production, and can be divided into two rollers, four rollers, six rollers, eight rollers, twelve rollers, eighteen rollers and the like according to the number of rollers; the common rolling mill mainly comprises a roller, a frame, a roller spacing adjusting device, a roller temperature adjusting device, a transmission device, a lubricating system, a control system, a roller disassembling device and the like. Besides the main parts and devices of the common rolling mill, the precision rolling mill is additionally provided with a device for ensuring the rolling precision.
The existing rolling mill is in the rolling process, the supporting roll is required to be used for carrying out high-strength pressurization on steel, in the pressurizing process, a plurality of broken slag and dust can be adhered to the supporting roll, if the broken slag on the supporting roll is not cleaned in time, the influence on the smooth finish of a follow-up rolled plate can be caused, even harm can be caused to the roll body of the supporting roll, the existing rolling mill does not have the function of cleaning the supporting roll, most of the existing supporting rolls are integrally formed, the supporting roll is damaged and then is replaced more complexly, and therefore the existing rolling mill supporting roll has defects.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rolling mill backing roll to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a rolling mill backing roll, includes the base, base top outer wall both sides end fixedly connected with lift seat, lift seat top portion fixedly connected with lifter, the lifter top is fixed with the backing roll through the pivot seat, the backing roll below is equipped with cleaning device, cleaning device includes the storage water tank, storage water tank top outer wall fixedly connected with arc supporting frame, arc supporting frame top outer wall is equipped with the arc wall, the arc wall uses with the backing roll cooperation, arc supporting frame bottom end right side end is equipped with the transfer case, arc wall bottom inner wall both sides end fixedly connected with washs the shower nozzle, wash the shower nozzle other end and transfer case outer end wall fixed connection, arc wall left side end inner wall upper portion is fixed with the sanding block, arc wall right side end inner wall upper portion is fixed with the cleaning brush, the sanding block uses with the cleaning brush and the backing roll cooperation.
As a further aspect of the present invention: the interior fixedly connected with baffle of storage water tank, baffle outside end and the inboard end wall fixed connection of storage water tank, storage water tank right side end inner wall bottom fixedly connected with miniature pump, miniature pump left side end passes through pipeline and transit incasement end inner wall fixed connection.
As a further aspect of the present invention: the arc wall bottom inner wall center department is equipped with the delivery port, and baffle left side end outer wall upper portion is equipped with filter equipment, baffle left side end wall upper portion and storage water tank left side end inner wall upper portion fixedly connected with bolster, and filter equipment bottom portion sets up on bolster, delivery port below fixedly connected with raceway, the raceway other end and storage water tank top inner wall left side fixed connection.
As a further aspect of the present invention: the filter device is provided with a guide plate below, the right side end of the guide plate is fixedly connected with the left side end wall of the partition plate, the left side end of the guide plate is fixedly connected with the inner wall of the left side end of the water storage tank, and a water through opening is formed in the joint of the partition plate and the right side end of the guide plate.
As a further aspect of the present invention: the left side end of the polishing block is fixedly connected with the upper portion of the inner wall of the left side end of the arc-shaped groove through a support frame, and the right side end of the cleaning brush is fixedly connected with the upper portion of the inner wall of the right side end of the arc-shaped groove through a support frame.
As a further aspect of the present invention: the backing roll includes the roll body, roll body both sides tip is equipped with square slot, through the square inserted block of the mode fixedly connected with of pegging graft in the square slot, the inside fixedly connected with four-way telescoping device of square inserted block, square slot inserted block up end, lower terminal surface, preceding terminal surface and rear end face are through the square cardboard of the mode fixedly connected with who cup joints, four-way telescoping device passes through telescopic link and the inboard end wall fixed connection of square cardboard, square slot is equipped with the draw-in groove with square cardboard junction, square cardboard uses with the draw-in groove cooperation.
As a further aspect of the present invention: one end fixedly connected with bull stick that square slot was kept away from to square inserted block, the bull stick other end rotates with the rotating shaft seat to be connected, the inboard end wall fixedly connected with lift slide rail of lift seat, the automatically controlled lifter plate of fixedly connected with on the lift slide rail, cleaning device bottom end portion and automatically controlled lifter plate top outer wall fixed connection.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses in, the piece of polishing that sets up can polish and glue the disintegrating slag of depositing on the roll body with the roll body behind the rolling steel and clear up, and the clean shower nozzle of setting can carry out water spray cleaning to the roll body, and the cleaning brush of setting can be scrubbed the dust of depositing to gluing on the roll body, can effectively glue the dust of depositing and clear up with the disintegrating slag to the backing roll through the above-mentioned mode to prevent that these disintegrating slag from causing the influence to the smooth finish of follow-up steel.
2. The utility model discloses in, when the user need dismantle the backing roll, the quadriversal telescoping device that sets up in the steerable square inserted block makes the telescopic link shrink for the draw-in groove in square cardboard and the square slot separates, can make things convenient for the workman to take off the backing roll like this, thereby makes the installation and the dismantlement of backing roll more convenient.
Drawings
FIG. 1 is a schematic view showing an external structure of a rolling mill supporting roll in a front view direction.
FIG. 2 is a side view of a cleaning device for a backup roll of a rolling mill.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
FIG. 4 is a schematic sectional view showing the front view direction of the supporting rolls in the supporting rolls of the rolling mill.
FIG. 5 is a schematic sectional view of a square insert block in a rolling mill support roll in a front view.
FIG. 6 is a perspective view of a square insert in a rolling mill backup roll in a front view.
In the figure: 1. a base; 2. a lifting seat; 3. a lifting rod; 4. a support roller; 4-1, a roller body; 4-2, a square slot; 4-3, rotating rod; 4-4, square inserting blocks; 4-4-1, a four-way expansion device; 4-4-2, a telescopic rod; 4-4-3, square snap-gauge; 5. a cleaning device; 5-1, a water storage tank; 5-2, a partition board; 5-3, a micro water pump; 5-4, arc-shaped clamping frames; 5-5, arc-shaped groove; 5-6, grinding blocks; 5-7, a support frame; 5-8, cleaning brush; 5-9, a transfer box; 5-10, cleaning the spray head; 5-11 parts of water outlet; 5-12 parts of water conveying pipe; 5-13, a filtering device; 5-14, a baffle; 6. lifting the slide rail; 7. an electrically controlled lifter plate.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1-3, a rolling mill supporting roller comprises a base 1, wherein lifting seats 2 are fixedly connected to two sides of the outer wall of the top end of the base 1, a lifting rod 3 is fixedly connected to the top end of the lifting seat 2, the lifting seat 2 and the lifting rod 3 are arranged to facilitate the adjustment of the height of the supporting roller 4, the supporting roller 4 is fixed to the top end of the lifting rod 3 through a rotating shaft seat, a cleaning device 5 is arranged below the supporting roller 4, the cleaning device 5 comprises a water storage tank 5-1, an arc-shaped holding frame 5-4 is fixedly connected to the outer wall of the top end of the water storage tank 5-1, an arc-shaped groove 5-5 is formed in the outer wall of the top end of the arc-shaped holding frame 5-4, the arc-shaped groove 5-5 is matched with the supporting roller 4 for use, a transfer box 5-9 is arranged at the right side end of the bottom end of the arc-shaped holding frame 5, cleaning nozzles 5-5 are fixedly connected to two sides of the inner wall of the bottom end of the arc-5, the other end of the cleaning spray head 5-10 is fixedly connected with the outer end wall of the transfer box 5-9, the upper part of the inner wall of the left side end of the arc-shaped groove 5-5 is fixedly provided with a polishing block 5-6, the upper part of the inner wall of the right side end of the arc-shaped groove 5-5 is fixedly provided with a cleaning brush 5-8, the arranged polishing block 5-6 can polish and clean the slag remained on the roller body 4-1, the arranged cleaning spray head 5-10 is used for washing the polished roller body 4-1, the arranged cleaning brush 5-8 is used for cleaning the washed roller body 4-1, the dust remained on the roller body 4-1 can be cleaned by the above method, the polishing block 5-6 is matched with the cleaning brush 5-8 and the supporting roller 4 for use, the inside of the water storage box 5-1 is fixedly connected with a partition plate 5-2, the outer side end of the partition plate 5-2 is fixedly connected with the inner side end wall of the water storage box 5-1, the bottom of the inner wall of the right side end of the water storage tank 5-1 is fixedly connected with a micro water pump 5-3, the left side end of the micro water pump 5-3 is fixedly connected with the inner wall of the bottom end of the transfer tank 5-9 through a pipeline, the center of the inner wall of the bottom end of the arc-shaped groove 5-5 is provided with a water outlet 5-11, the upper part of the outer wall of the left side end of the clapboard 5-2 is provided with a filtering device 5-13, the upper part of the left side end wall of the clapboard 5-2 and the upper part of the inner wall of the left side end of the water storage tank 5-1 are fixedly connected with a supporting cushion block, the bottom end part of the filtering device 5-13 is arranged on the supporting cushion block, a water delivery pipe 5-12 is fixedly connected below the water outlet 5-11, the other end of the water delivery pipe 5-12 is fixedly connected with the left side end of the inner wall of the top end of the water storage tank 5-1, and a guide plate 5-14 is arranged below the filtering device 5-13, the right side end of the guide plate 5-14 is fixedly connected with the left side end wall of the partition plate 5-2, the left side end of the guide plate is fixedly connected with the inner wall of the left side end of the water storage tank 5-1, a water through hole is arranged at the joint of the partition plate 5-2 and the right side end of the guide plate 5-14, the washed washing water can fall onto the filtering device 5-13 through the water outlet 5-11 and the water delivery pipe 5-12, the filtering device 5-13 can filter the crushed slag and dust mixed in the washing water, the filtered washing water can return to the micro water pump 5-3 through the guide plate 5-14, so that the water resource is efficiently utilized, and after one end of time, a user can draw out the filtering device 5-13 from the water storage tank 5-1 for cleaning, and the influence on the filtering effect caused by excessive impurities filtered on the filtering device 5-13 is prevented, the left side end of the polishing block 5-6 is fixedly connected with the upper part of the inner wall of the left side end of the arc-shaped groove 5-5 through a support frame 5-7, and the right side end of the cleaning brush 5-8 is fixedly connected with the upper part of the inner wall of the right side end of the arc-shaped groove 5-5 through a support frame.
Referring to fig. 4-6, the supporting roller 4 includes a roller body 4-1, square slots 4-2 are provided at both side ends of the roller body 4-1, square insertion blocks 4-4 are fixedly connected in the square slots 4-2 in an insertion manner, four-way expansion devices 4-4-1 are fixedly connected in the square insertion blocks 4-4, square snap-gauge plates 4-4-3 are fixedly connected in the upper end surface, the lower end surface, the front end surface and the rear end surface of the square insertion blocks in a sleeving manner, the four-way expansion devices 4-4-1 are fixedly connected with the inner side end walls of the square snap-gauge plates 4-4-3 through expansion rods 4-4-2, snap-grooves are provided at the joints of the square slots 4-4-3, the square snap-gauge plates 4-4-3 are used in cooperation with the snap grooves, one end of the square inserting block 4-4, which is far away from the square slot 4-2, is fixedly connected with a rotating rod 4-3, the other end of the rotating rod 4-3 is rotatably connected with a rotating shaft seat, when a user needs to disassemble the supporting roller 4, a four-way telescopic device 4-4-1 arranged in the square inserting block 4-4 can be controlled to enable the telescopic rod 4-4-2 to contract, so that the square clamping plate 4-4-3 is separated from a clamping groove in the square slot 4-2, the supporting roller 4 can be conveniently taken down by a worker, the end wall of the inner side of the lifting seat 2 is fixedly connected with a lifting slide rail 6, an electric control lifting plate 7 is fixedly connected onto the lifting slide rail 6, the bottom end part of the cleaning device 5 is fixedly connected with the outer wall of the top end of the electric control lifting plate 7, and the lifting slide rail 6 and the electric control lifting plate 7 are arranged so that the user can conveniently adjust the height of the cleaning device 5 according to the height of the supporting roller 4, make the utility model discloses the practicality is higher.
The utility model discloses a theory of operation is: mounting mode of the supporting roller 4: firstly, a rotating rod 4-3 at one side of a supporting roller 4 is connected with a rotating shaft seat on a lifting rod 3, then one end of the supporting roller 4 is inserted into a square insertion block 4-4 fixed at the other end of the rotating rod 4-3, after the insertion is finished, a four-way expansion device 4-4-1 in the square insertion block 4-4 is controlled to enable an expansion rod 4-4-2 to extend, a square clamping plate 4-4-3 on the end surface of the square insertion block 4-4 is clamped with a clamping groove in a square insertion groove 4-2, then the other end of the supporting roller 4 is connected with the rotating rod 4-3 at the other side in the same way, and then the rotating rod 4-3 at the other side is connected with the rotating shaft seat, so that the installation of the supporting roller 4 is finished;
after the supporting roller 4 is installed, the electric control lifting plate 7 is controlled to move up and down, so that the grinding blocks 5-6 and the cleaning brushes 5-8 arranged on the cleaning device 5 are contacted with the outer end wall of the roller body 4-1, when the end surface of the steel rolled by the supporting roller 4 is stuck with slag and dust, the arranged grinding block 5-6 can grind and clean the residual slag of the roller body 4-1, meanwhile, the arranged micro water pump 5-3 can convey cleaning water to the transfer box 5-9 through a pipeline, the transfer box 5-9 conveys the cleaning water to the cleaning spray head 5-10, the cleaning spray head 5-10 can wash the polished roller body 4-1, and then the arranged cleaning brush 5-8 can clean the washed roller body 4-1, so that residual dust on the roller body 4-1 can be cleaned in the above manner; the washed washing water can fall onto the filtering device 5-13 through the water outlet 5-11 and the water conveying pipe 5-12, the filtering device 5-13 can filter crushed slag and dust mixed in the washing water, the filtered washing water can return to the micro water pump 5-3 through the guide plate 5-14, so that water resources are efficiently utilized, after workers finish rolling steel, the filtering device 5-13 can be drawn out from the water storage tank 5-1 for cleaning, and the filtering effect is prevented from being influenced by excessive impurities filtered on the filtering device 5-13.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (7)
1. A rolling mill supporting roller comprises a base (1), wherein lifting seats (2) are fixedly connected with two sides of the outer wall of the top end of the base (1), a lifting rod (3) is fixedly connected with the top end of the lifting seat (2), and a supporting roller (4) is fixed at the top end of the lifting rod (3) through a rotating shaft seat, and is characterized in that a cleaning device (5) is arranged below the supporting roller (4), the cleaning device (5) comprises a water storage tank (5-1), an arc-shaped clamping frame (5-4) is fixedly connected with the outer wall of the top end of the water storage tank (5-1), an arc-shaped groove (5-5) is formed in the outer wall of the top end of the arc-shaped clamping frame (5-4), the arc-shaped groove (5-5) is matched with the supporting roller (4) for use, a transfer case (5-9) is arranged at the right side of the bottom end of the arc-shaped clamping frame (5-4), and cleaning nozzles (5-10) are fixedly connected with two sides of the inner wall of the bottom end of the arc-shaped groove (5-5), the other end of the cleaning spray head (5-10) is fixedly connected with the outer end wall of the transfer case (5-9), the upper part of the inner wall of the left side end of the arc-shaped groove (5-5) is fixedly provided with a polishing block (5-6), the upper part of the inner wall of the right side end of the arc-shaped groove (5-5) is fixedly provided with a cleaning brush (5-8), and the polishing block (5-6), the cleaning brush (5-8) and the supporting roll (4) are matched for use.
2. The support roll for the rolling mill as claimed in claim 1, wherein a partition plate (5-2) is fixedly connected in the water storage tank (5-1), the outer side end of the partition plate (5-2) is fixedly connected with the inner side end wall of the water storage tank (5-1), a micro water pump (5-3) is fixedly connected to the bottom of the inner wall of the right side end of the water storage tank (5-1), and the left side end of the micro water pump (5-3) is fixedly connected with the inner wall of the bottom end of the transit box (5-9) through a pipeline.
3. A supporting roll for a rolling mill according to claim 1, characterized in that a water outlet (5-11) is arranged at the center of the inner wall of the bottom end of the arc-shaped groove (5-5), a filtering device (5-13) is arranged on the upper part of the outer wall of the left side end of the partition plate (5-2), a supporting cushion block is fixedly connected with the upper part of the inner wall of the left side end of the water storage tank (5-1) on the upper part of the end wall of the left side end of the partition plate (5-2), the bottom end of the filtering device (5-13) is arranged on the supporting cushion block, a water conveying pipe (5-12) is fixedly connected below the water outlet (5-11), and the other end of the water conveying pipe (5-12) is fixedly connected with the left side end of the inner wall of the top end of the water storage tank (5-1).
4. A supporting roll for a rolling mill according to claim 3, characterized in that a guide plate (5-14) is arranged below the filtering device (5-13), the right side end of the guide plate (5-14) is fixedly connected with the left side end wall of the partition plate (5-2), the left side end of the guide plate is fixedly connected with the inner wall of the left side end of the water storage tank (5-1), and a water through opening is arranged at the joint of the partition plate (5-2) and the right side end of the guide plate (5-14).
5. A backup roll for a rolling mill according to claim 1, characterized in that the left side end of the sanding block (5-6) is fixedly connected with the upper part of the inner wall of the left side end of the arc-shaped groove (5-5) through a support frame (5-7), and the right side end of the cleaning brush (5-8) is fixedly connected with the upper part of the inner wall of the right side end of the arc-shaped groove (5-5) through a support frame.
6. The support roll for the rolling mill according to claim 1, characterized in that the support roll (4) comprises a roll body (4-1), square slots (4-2) are arranged at the two side ends of the roll body (4-1), square insertion blocks (4-4) are fixedly connected in the square slots (4-2) in an insertion manner, four-way expansion devices (4-4-1) are fixedly connected in the square insertion blocks (4-4), the upper end surface, the lower end surface, the front end surface and the rear end surface of each square slot insertion block are fixedly connected with square clamping plates (4-4-3) in a sleeved manner, the four-way expansion devices (4-4-1) are fixedly connected with the inner side end walls of the square clamping plates (4-4-3) through expansion rods (4-4-2), and clamping grooves are arranged at the joints of the square slots (4-4-3), the square clamping plate (4-4-3) is matched with the clamping groove for use.
7. The support roll for the rolling mill according to claim 6, wherein one end of the square plug block (4-4) far away from the square slot (4-2) is fixedly connected with a rotating rod (4-3), the other end of the rotating rod (4-3) is rotatably connected with a rotating shaft seat, the inner end wall of the lifting seat (2) is fixedly connected with a lifting slide rail (6), an electric control lifting plate (7) is fixedly connected with the lifting slide rail (6), and the bottom end part of the cleaning device (5) is fixedly connected with the outer wall of the top end of the electric control lifting plate (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120631929.XU CN214441844U (en) | 2021-03-29 | 2021-03-29 | Support roll of rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120631929.XU CN214441844U (en) | 2021-03-29 | 2021-03-29 | Support roll of rolling mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214441844U true CN214441844U (en) | 2021-10-22 |
Family
ID=78175508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120631929.XU Expired - Fee Related CN214441844U (en) | 2021-03-29 | 2021-03-29 | Support roll of rolling mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214441844U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117583288A (en) * | 2024-01-18 | 2024-02-23 | 江苏久尔重工股份有限公司 | Hollow roller cleaning equipment |
-
2021
- 2021-03-29 CN CN202120631929.XU patent/CN214441844U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117583288A (en) * | 2024-01-18 | 2024-02-23 | 江苏久尔重工股份有限公司 | Hollow roller cleaning equipment |
| CN117583288B (en) * | 2024-01-18 | 2024-04-05 | 江苏久尔重工股份有限公司 | Hollow roller cleaning equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211022 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |