CN214865871U - Cleaning device for maintaining coking instrument - Google Patents

Cleaning device for maintaining coking instrument Download PDF

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Publication number
CN214865871U
CN214865871U CN202121402148.XU CN202121402148U CN214865871U CN 214865871 U CN214865871 U CN 214865871U CN 202121402148 U CN202121402148 U CN 202121402148U CN 214865871 U CN214865871 U CN 214865871U
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wall
rod
groove
coking
instrument
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Expired - Fee Related
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CN202121402148.XU
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Chinese (zh)
Inventor
徐震
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Individual
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Individual
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Abstract

The utility model provides a cleaning device is used in coking instrument maintenance. Coking instrument is maintained and is used cleaning device includes: an operating lever; the accommodating groove is formed in the top end of the operating rod; the groove is formed in the inner wall of the bottom of the accommodating groove; the long rod is slidably mounted on the inner wall of the groove, and one end of the long rod extends into the groove; the cleaning cylinder is arranged on the long rod; the two groove bodies are arranged on the outer wall of the long rod; the two side grooves are respectively formed in the inner wall of the groove; the two chambers are arranged on the operating rod; a moving barrel slidably mounted on an outer wall of the lever. The utility model provides a cleaning device is used in coking instrument maintenance has the simple operation, conveniently carries out thorough clearance, can carry out the advantage of the clearance of multi-angle to the instrument.

Description

Cleaning device for maintaining coking instrument
Technical Field
The utility model relates to a coking instrument maintains technical field, especially relates to a coking instrument maintains and uses cleaning device.
Background
Coking is a process of carbonizing organic matters, coking is short for residual oil coke, and during the coking process, carbonization data in coal needs to be monitored, and at the moment, a coking instrument needs to be used for detection during carbonization.
Coking instrument is using the in-process of coal dry distillation, coking instrument can receive production to influence and produce a large amount of dusts and the dirty and disorderly condition appears, consequently need the staff to carry out regular clearance to the instrument, otherwise can influence the normal use of instrument, can reduce the availability factor of instrument simultaneously, but at present when focusing the instrument and clearing up, can only clean through the rag, and the waste residue that produces when can have the coking in some managements of instrument bottom equally adheres to, then can be comparatively loaded down with trivial details during the clearance, can't carry out thorough clearance to the management of instrument, the dust waste residue that remains in some gaps of the outside of instrument simultaneously can't obtain effectual cleanness equally, thereby the cleaning efficiency of focusing the instrument reduces, and influence the effect of clearance, then the life of influence instrument in a certain degree in the past in the long term.
Therefore, it is necessary to provide a cleaning device for maintaining a coking instrument to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a cleaning device is used in coking instrument maintenance that thorough clearance, the clearance that can carry out the multi-angle are carried out to the instrument to simple operation, convenience.
In order to solve the technical problem, the utility model provides a cleaning device is used in coking instrument maintenance, include: an operating lever; the accommodating groove is formed in the top end of the operating rod; the groove is formed in the inner wall of the bottom of the accommodating groove; the long rod is slidably mounted on the inner wall of the groove, and one end of the long rod extends into the groove; the cleaning cylinder is arranged on the long rod; the two groove bodies are arranged on the outer wall of the long rod; the two side grooves are respectively formed in the inner wall of the groove; the two chambers are arranged on the operating rod; the moving cylinder is slidably mounted on the outer wall of the operating rod; the two inclined plane grooves are formed in the inner wall of the movable cylinder; the two pressure rods are respectively installed in the two cavities in a sliding mode, one ends, far away from each other, of the two pressure rods respectively extend into the two inclined plane grooves, and one ends, close to each other, of the two pressure rods respectively extend into the two side grooves; the rotating cylinder is installed on the outer wall of the operating rod in a threaded mode and is connected with the moving cylinder in a sliding mode; the placing groove is formed in the outer wall of the operating rod; the brushing plate is arranged in the placing groove.
Preferably, the cleaning cylinder is fixedly mounted on the outer wall of the long rod through a plurality of bolts.
Preferably, the inner walls of the two groove bodies are fixedly provided with non-slip pads, and one ends of the two pressing rods, which are close to each other, are fixedly provided with sanding pads.
Preferably, sliding plates are fixedly mounted on the outer walls of the two pressing rods, the two sliding plates are respectively in sliding connection with the inner walls of the two chambers, springs are sleeved on the two pressing rods, the ends, close to each other, of the two springs are respectively fixedly connected with the inner wall of one side, close to each other, of the two chambers, and the ends, far away from each other, of the two springs are respectively fixedly connected with the outer wall of one side, close to each other, of the two sliding plates.
Preferably, fixed mounting has the dwang on one side inner wall of standing groove, rotate on the dwang and install the board of brushing clearly, fixed mounting has the carousel on the dwang, a plurality of caulking grooves have been seted up on the carousel, the cavity has been seted up on the action bars, slidable mounting has the diving board in the cavity, fixed mounting has the ejector pin on one side outer wall of diving board, the one end of ejector pin extends to outside the action bars, fixed mounting has the embedded column on one side outer wall of diving board, the one end of embedded column extends to extend to corresponding in the standing groove in the caulking groove, the cover is equipped with the pressure spring on the ejector pin, the one end of pressure spring with one side inner wall fixed connection of cavity, the other end of pressure spring with one side outer wall fixed connection of diving board.
Preferably, an inner cavity is formed in the long rod, threaded rods are rotatably mounted on the inner wall of the top and the inner wall of the bottom of the inner cavity, the top end of each threaded rod extends out of the long rod, four limiting columns are fixedly mounted on the inner wall of the inner cavity, four sliding blocks are slidably mounted on the limiting columns, supporting rods are fixedly mounted on the tops of the four sliding blocks, one ends of the four supporting rods extend out of the long rod, two abutting blocks are slidably mounted on the inner wall of the inner cavity, the bottom end of each threaded rod penetrates through the two abutting blocks and is in threaded connection with the two abutting blocks, and two sides of the two abutting blocks are in contact with the outer wall of one side of each of the two supporting rods.
Preferably, four equal fixed mounting has a baffle, four on the one end of spacing post all the cover is equipped with the extension spring on the spacing post, four the one end of extension spring respectively with four one side outer wall fixed connection of baffle, four the other end of extension spring respectively with four one side outer wall fixed connection of sliding block.
Compared with the prior art, the utility model provides a cleaning device is used in coking instrument maintenance has following beneficial effect:
the utility model provides a coking instrument is maintained and is used cleaning device, when needs are cleared up the coking instrument, the staff can shift out in by the holding tank a clean section of thick bamboo, and can freely adjust the length of a clean section of thick bamboo and adjust, carry on spacing back to the stock, the staff can clear up the pipeline position in the instrument through a clean section of thick bamboo, and when clearing up the clearance department to some instruments, the staff can rotate the scrubbing board and clear up the operation, and the angle of regulation scrubbing board that can be nimble, equally after clean the completion, the staff can with clean section of thick bamboo with the scrubbing board income holding tank respectively and standing groove, thereby make things convenient for the staff to hand-carry.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of a cleaning device for maintaining a coking instrument, provided by the present invention;
FIG. 2 is an enlarged schematic view of portion A shown in FIG. 1;
FIG. 3 is an enlarged schematic view of portion B shown in FIG. 1;
FIG. 4 is a schematic side view of the placement tank shown in FIG. 1;
fig. 5 is a schematic view of a second embodiment of a cleaning device for maintaining a coking instrument provided by the present invention;
fig. 6 is an enlarged schematic view of the portion C shown in fig. 5.
Reference numbers in the figures: 1. an operating lever; 2. accommodating grooves; 3. a groove; 4. a long rod; 5. a cleaning cartridge; 6. a trough body; 7. a non-slip mat; 8. a side groove; 9. a chamber; 10. a pressure lever; 11. grinding a sand cushion; 12. moving the drum; 13. an inclined plane groove; 14. a rotating cylinder; 15. a placement groove; 16. rotating the rod; 17. cleaning the board; 18. a turntable; 19. caulking grooves; 20. a cavity; 21. a top rod; 22. embedding a column; 23. an inner cavity; 24. a threaded rod; 25. a limiting column; 26. a slider; 27. a stay bar; 28. and a contact block.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments.
First embodiment
Referring to fig. 1-4, in a first embodiment of the present invention, a cleaning device for maintaining a coking instrument includes: an operating lever 1; the accommodating groove 2 is formed in the top end of the operating rod 1; the groove 3 is formed in the inner wall of the bottom of the accommodating groove 2; the long rod 4 is slidably mounted on the inner wall of the groove 3, and one end of the long rod 4 extends into the groove 3; the outer wall of the cleaning cylinder 5 is provided with a soft brush, in the actual use process, the cleaning cylinder 5 extends into an instrument pipeline to effectively clean the instrument pipeline, and the cleaning cylinder 5 is arranged on the long rod 4; the two groove bodies 6 are arranged on the outer wall of the long rod 4; the two side grooves 8 are respectively formed in the inner wall of the groove 3, when the two pressure rods 10 are not abutted, the two abrasive pads 11 are respectively positioned in the two side grooves 8 and can move oppositely to enter the two groove bodies 6 when being abutted, so that the two abrasive pads 11 are in contact extrusion with the two anti-slip pads 7, and the positioning effect is realized; two chambers 9, wherein the two chambers 9 are both arranged on the operating rod 1; the two moving cylinders 12 are subjected to the limiting sliding effect, so that the two moving cylinders 12 can only move along the direction of the operating rod 1 and cannot rotate along with the rotation of the rotating cylinder 14; two inclined plane grooves 13, wherein the two inclined plane grooves 13 are formed in the inner wall of the movable cylinder 12; the two pressure rods 10 are respectively slidably mounted in the two chambers 9, the ends, far away from each other, of the two pressure rods 10 respectively extend into the two inclined plane grooves 13, the ends, close to each other, of the two pressure rods 10 respectively extend into the two side grooves 8, the ends, far away from each other, of the two pressure rods 10 are respectively and fixedly mounted with inclined plane blocks, and the inclined angles of the two inclined plane blocks are respectively the same as the inclined angles of the inner walls of the sides, far away from each other, of the two inclined plane grooves 13, so that the contact force is increased, and the two pressure rods 10 can smoothly move in opposite directions; the rotating cylinder 14 is installed on the outer wall of the operating rod 1 in a threaded mode, the rotating cylinder 14 is connected with the moving cylinder 12 in a sliding mode, external threads are arranged on the outer wall of the operating rod 1, an annular slide way is formed in one end, installed on the external threads, of the moving cylinder 12 in a threaded mode, of the rotating cylinder 14, an annular slide block is fixedly installed on one end of the rotating cylinder 14, and the annular slide block is connected with the inner wall of the annular slide way in a sliding mode; the placing groove 15 is formed in the outer wall of the operating rod 1; a cleaning and brushing plate 17, wherein the cleaning and brushing plate 17 is arranged in the placing groove 15.
In order to effectively fix the cleaning cylinder 5, in the present embodiment, it is preferable that the cleaning cylinder 5 is fixedly mounted on the outer wall of the long rod 4 by a plurality of bolts.
In order to increase the friction force between the two pressing rods 10 and the long rod 4, in the embodiment, preferably, the inner walls of the two groove bodies 6 are fixedly provided with the anti-slip pads 7, and the ends of the two pressing rods 10 close to each other are fixedly provided with the sanding pads 11.
In order to enable the two pressing rods 10 to be automatically separated from the long rod 4 and move out of the two groove bodies 6 when the two pressing rods 10 are not abutted, in the embodiment, preferably, sliding plates are fixedly mounted on outer walls of the two pressing rods 10, the two sliding plates are respectively in sliding connection with inner walls of the two cavities 9, springs are sleeved on the two pressing rods 10, one ends, close to each other, of the two springs are respectively fixedly connected with the inner wall, close to each other, of one side of the two cavities 9, and one ends, far away from each other, of the two springs are respectively fixedly connected with the outer wall, close to each other, of one side of the two sliding plates.
In order to effectively fix the brushing plate 17 and freely adjust the angle of the brushing plate 17, in this embodiment, it is preferable that a rotating rod 16 is fixedly mounted on the inner wall of one side of the placing groove 15, the rotating rod 16 is rotatably mounted with the brushing plate 17, a rotating disk 18 is fixedly mounted on the rotating rod 16, a plurality of embedded grooves 19 are formed on the rotating disk 18, a cavity 20 is formed on the operating rod 1, an elastic plate is slidably mounted in the cavity 20, an ejector rod 21 is fixedly mounted on the outer wall of one side of the elastic plate, one end of the ejector rod 21 extends out of the operating rod 1, an embedded column 22 is fixedly mounted on the outer wall of one side of the elastic plate, one end of the embedded column 22 extends into the placing groove 15 and extends into the corresponding embedded groove 19, a pressure spring is sleeved on the ejector rod 21, and one end of the pressure spring is fixedly connected with the inner wall of one side of the cavity 20, the other end of the pressure spring is fixedly connected with the outer wall of one side of the elastic plate.
In this embodiment:
when the coking instrument needs to be cleaned, firstly, a worker can move the long rod 4 out of the accommodating groove 2, so that the cleaning cylinder 5 is moved out of the accommodating groove 2, and then the long rod 4 is driven to move, in the moving process, the worker can extend the cleaning cylinder 5 to a proper length according to the specification of the instrument needing to be cleaned, then the worker can rotate the rotating cylinder 14, the rotating cylinder 14 rotates to drive the moving cylinder 12 to transversely move under the transmission of threads, so that the two inclined plane grooves 13 respectively abut against the two pressure rods 10, and then the two pressure rods 10 move oppositely, so that the two sand grinding cushions 11 are driven to move oppositely, finally the two sand grinding cushions 11 respectively enter the two groove bodies 6, and finally contact with the two anti-skid cushions 7, so that the long rod 4 is positioned, and the cleaning cylinder 5 is positioned, and meanwhile, the two sliding plates are driven to move oppositely by the opposite movement of the two pressure rods 10, thereby make two springs all be in the state of compression, the staff can clear up the pipeline position inside in the instrument through a clean section of thick bamboo 5 this moment to can adjust the instrument pipeline of different specifications is dealt with to the length position of a clean section of thick bamboo 5, through can withdraw a clean section of thick bamboo 5 after the clearance is accomplished in holding tank 2, make things convenient for the staff to hand-carry.
When cleaning some crack gaps of the instrument, a worker can transversely pull one end of the ejector rod 21, so that the ejector rod 21 transversely moves to drive the elastic plate to transversely move, at the moment, the ejector rod 21 transversely moves to drive the elastic plate to transversely move, the embedded column 22 is driven to transversely move simultaneously in the process of compressing the pressure spring, when the embedded column 22 moves out of the corresponding embedded groove 19, the embedded column 22 loses the limiting effect on the turntable 18, at the moment, the worker can rotate the cleaning plate 17, after the cleaning plate 17 rotates out of the placing groove 15, the turntable 18 is driven to rotate, at the moment, the worker can rotate the cleaning plate 17 to a proper position according to the cleaning requirement, and then the worker can loosen the ejector rod 21 after positioning the angle, under the resetting effect of the pressure spring, the embedded column 22 can reversely move along with the elastic plate, so that the embedded column 22 enters a new embedded groove 19, at this moment, the brushing plate 17 is limited again, so that workers can clean gaps between gaps of some instruments conveniently, different angles can be adjusted flexibly to clean different positions, and the workers can withdraw the brushing plate 17 again into the placing groove 15 after cleaning is completed, so that the workers can carry conveniently.
Compared with the prior art, the utility model provides a cleaning device is used in coking instrument maintenance has following beneficial effect:
when needs clear up the coking instrument, the staff can shift out in by holding tank 2 with a clean section of thick bamboo 5, and can freely adjust the length of a clean section of thick bamboo 5 and adjust, carry out spacing back to stock 4, the staff can clear up the pipeline position in the instrument through a clean section of thick bamboo 5, and when clearing up the clearance department to some instruments, the staff can rotate cleaning brush board 17 and clear up the operation, and the angle of regulation cleaning brush board 17 that can be nimble, after clean completion equally, the staff can with clean section of thick bamboo 5 with cleaning brush board 17 respectively in holding tank 2 and standing groove 15, thereby make things convenient for the staff to hand-carry.
Second embodiment:
based on the cleaning device for maintaining the coking instrument provided by the first embodiment of the application, the second embodiment of the application provides another cleaning device for maintaining the coking instrument. The second embodiment is merely a preferred way of the first embodiment, and the implementation of the second embodiment does not affect the implementation of the first embodiment alone.
The second embodiment of the present invention will be further explained with reference to the drawings and the embodiments.
Referring to fig. 5-6, in a second embodiment of the garbage can for facilitating garbage classification of the present invention: an inner cavity 23 is arranged on the long rod 4, threaded rods 24 are rotatably arranged on the inner wall of the top part and the inner wall of the bottom part of the inner cavity 23, the top end of the threaded rod 24 extends out of the long rod 4, the cleaning cylinder 5 is sleeved on the outer wall of the long rod 4, four limiting columns 25 are fixedly installed on the inner wall of the inner cavity 23, sliding blocks 26 are installed on the four limiting columns 25 in a sliding manner, supporting rods 27 are fixedly installed at the top ends of the four sliding blocks 26, one ends of the four supporting rods 27 extend out of the long rod 4, two contact blocks 28 are slidably mounted on the inner wall of the inner cavity 23, one end of each of the four support rods 27 is provided with an inclined plane, thereby increase the conflict power between two counterblock 28 and four vaulting poles 27, the bottom of threaded rod 24 runs through two respectively counterblock 28 and with two counterblock 28 threaded connection, two the both sides of counterblock 28 respectively with two one side outer wall of vaulting pole 27 contacts.
In order to make four vaulting poles 27 remove in can being automatic to inner chamber 23 when not receiving the conflict, in this embodiment, preferably, four equal fixed mounting has a baffle, four in one of spacing post 25 all overlap on the spacing post 25 and be equipped with the extension spring, four the one end of extension spring respectively with four one side outer wall fixed connection of baffle, four the other end of extension spring respectively with four one side outer wall fixed connection of sliding block 26.
In this embodiment:
when cleaning the instrument pipeline, the cleaning cylinder 5 may be mixed with a mixture of oil residue and water, at this time, the worker needs to frequently detach the cleaning cylinder 5 for cleaning, the worker can rotate the threaded rod 24, the threaded rod 24 rotates to drive the two contact blocks 28 to move upwards, so that the two contact blocks 28 are separated from one side outer wall of the four support rods 27 respectively, at this time, under the reset effect of the four tension springs, the four support rods 27 move towards the inner cavity 23 under the reset effect of the four tension springs, so that one ends of the four support rods 27 are separated from the inside of the cleaning cylinder 5, at this time, the positioning effect on the cleaning cylinder 5 is lost, the worker can remove and replace the cleaning cylinder 5, at the time of fixation, the worker can reversely rotate the threaded rod 24 to move the two contact blocks 28 downwards, and finally the two contact blocks 28 are contacted with one side outer wall of the four support rods 27 respectively, thereby make four vaulting poles 27 remove outside long-pending pole 4 respectively, and then contradict through four vaulting poles 27 to the inner wall of a clean section of thick bamboo 5 and support, drive four sliding block 26 lateral shifting simultaneously and tensile four extension springs, make four extension springs be in tensile state to this supports the fixed of accomplishing a clean section of thick bamboo 5 through the conflict to the inner wall of a clean section of thick bamboo 5, compares in the mode of bolt fastening in the first embodiment, more quick convenient, labour saving and time saving.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (7)

1. A cleaning device for maintaining a coking instrument is characterized by comprising:
an operating lever;
the accommodating groove is formed in the top end of the operating rod;
the groove is formed in the inner wall of the bottom of the accommodating groove;
the long rod is slidably mounted on the inner wall of the groove, and one end of the long rod extends into the groove;
the cleaning cylinder is arranged on the long rod;
the two groove bodies are arranged on the outer wall of the long rod;
the two side grooves are respectively formed in the inner wall of the groove;
the two chambers are arranged on the operating rod;
the moving cylinder is slidably mounted on the outer wall of the operating rod;
the two inclined plane grooves are formed in the inner wall of the movable cylinder;
the two pressure rods are respectively installed in the two cavities in a sliding mode, one ends, far away from each other, of the two pressure rods respectively extend into the two inclined plane grooves, and one ends, close to each other, of the two pressure rods respectively extend into the two side grooves;
the rotating cylinder is installed on the outer wall of the operating rod in a threaded mode and is connected with the moving cylinder in a sliding mode;
the placing groove is formed in the outer wall of the operating rod;
the brushing plate is arranged in the placing groove.
2. The coker meter maintenance cleaning device of claim 1, wherein the cleaning cartridge is fixedly mounted to the outer wall of the long rod by a plurality of bolts.
3. The cleaning device for maintaining the coking instrument according to claim 1, characterized in that anti-slip pads are fixedly mounted on the inner walls of the two tank bodies, and a sand grinding pad is fixedly mounted on one end of each of the two pressing rods, which is close to each other.
4. The coking instrument maintenance cleaning device according to claim 1, characterized in that sliding plates are fixedly mounted on outer walls of the two pressing rods, the two sliding plates are respectively slidably connected with inner walls of the two chambers, springs are sleeved on the two pressing rods, ends, close to each other, of the two springs are respectively fixedly connected with inner walls, close to each other, of the two chambers, and ends, far away from each other, of the two springs are respectively fixedly connected with outer walls, close to each other, of the two sliding plates.
5. The cleaning device for the maintenance of the coking instrument according to claim 1, characterized in that a rotating rod is fixedly installed on the inner wall of one side of the placing groove, the rotating rod is rotatably provided with a brushing plate, the rotating rod is fixedly provided with a rotating disc, the rotating disc is provided with a plurality of caulking grooves, the operating rod is provided with a cavity, an elastic plate is arranged in the cavity in a sliding way, the outer wall of one side of the elastic plate is fixedly provided with an ejector rod, one end of the ejector rod extends out of the operating rod, an embedded column is fixedly arranged on the outer wall of one side of the elastic plate, one end of each embedded column extends into the corresponding placing groove and extends into the corresponding embedded groove, a pressure spring is sleeved on the ejector rod, one end of the pressure spring is fixedly connected with the inner wall of one side of the cavity, and the other end of the pressure spring is fixedly connected with the outer wall of one side of the elastic plate.
6. The cleaning device for the maintenance of the coking instrument according to claim 1, characterized in that an inner cavity is formed in the long rod, threaded rods are rotatably mounted on the top inner wall and the bottom inner wall of the inner cavity, the top end of each threaded rod extends out of the long rod, four limiting columns are fixedly mounted on the inner wall of the inner cavity, sliding blocks are slidably mounted on the four limiting columns, supporting rods are fixedly mounted on the top ends of the sliding blocks, one ends of the supporting rods extend out of the long rod, two abutting blocks are slidably mounted on the inner wall of the inner cavity, the bottom end of each threaded rod penetrates through the two abutting blocks and is in threaded connection with the two abutting blocks, and two sides of the two abutting blocks are respectively in contact with one outer wall of the two supporting rods.
7. The cleaning device for the maintenance of the coking instrument according to claim 6, characterized in that a baffle is fixedly mounted at each of four limiting columns, a tension spring is sleeved at each of four limiting columns, one end of each tension spring is fixedly connected with one outer wall of each of four baffles, and the other end of each tension spring is fixedly connected with one outer wall of each of four sliding blocks.
CN202121402148.XU 2021-06-24 2021-06-24 Cleaning device for maintaining coking instrument Expired - Fee Related CN214865871U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121402148.XU CN214865871U (en) 2021-06-24 2021-06-24 Cleaning device for maintaining coking instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121402148.XU CN214865871U (en) 2021-06-24 2021-06-24 Cleaning device for maintaining coking instrument

Publications (1)

Publication Number Publication Date
CN214865871U true CN214865871U (en) 2021-11-26

Family

ID=78906017

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121402148.XU Expired - Fee Related CN214865871U (en) 2021-06-24 2021-06-24 Cleaning device for maintaining coking instrument

Country Status (1)

Country Link
CN (1) CN214865871U (en)

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20211126

CF01 Termination of patent right due to non-payment of annual fee