CN210600665U - Pipeline plugging device - Google Patents
Pipeline plugging device Download PDFInfo
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- CN210600665U CN210600665U CN201920770360.8U CN201920770360U CN210600665U CN 210600665 U CN210600665 U CN 210600665U CN 201920770360 U CN201920770360 U CN 201920770360U CN 210600665 U CN210600665 U CN 210600665U
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Abstract
The utility model relates to the technical field of sealing devices, in particular to a pipeline plugging device, which can rapidly plug leakage of leakage holes on a pipeline, reduce the leakage amount of substances in the pipeline, reduce resource loss, simultaneously avoid the need of closing the whole conveying system, reduce property loss caused by closing the conveying system, save plugging time, improve the pipeline sealing effect and improve the practicability and reliability; the pipeline comprises a pipeline and a leakage port, wherein the front end and the rear end of the pipeline are communicated with an external conveying device, and the leakage port is positioned at the top end of the pipeline and is communicated with the inner wall of the pipeline; the device also comprises an upper pressing plate, a lower pressing plate, a sliding bin, a stud, a connecting block, a sealing block, a connecting sleeve and an adjusting nut.
Description
Technical Field
The utility model relates to a sealing device's technical field especially relates to a pipeline plugging device.
Background
As is known, pipelines are mainly used as auxiliary devices for the transfer of gases, liquids and other flowable substances, which are mainly in communication with other valves, pressurizing devices, feeding devices or connecting devices, through which the flowable substance is pressurized and then transported to the destination location through the pipeline, and are widely used in modern transport equipment.
When the existing pipeline is used for conveying materials, the pipeline is often leaked, the whole conveying system needs to be closed after the pipeline leaks, then the leaked pipeline is welded, sealed or replaced, the conveying system is closed, production stagnation is easily caused, a large amount of property loss is caused, and when the pipeline is replaced, the leaked pipeline cannot be reused, so that material waste is caused. Therefore, in the actual production, the quick leakage stoppage of the leakage pipeline is very important, and the property loss is reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a through carrying out quick leaking stoppage to the leakage hole on the pipeline, reduce the leakage quantity of material in the pipeline, reduce the resource loss, need not to close whole conveying system simultaneously, reduce the loss of property that closes conveying system and lead to, save the leaking stoppage time, improve the pipeline sealing effect simultaneously, improve the pipeline plugging device of practicality and reliability.
The utility model discloses a pipeline plugging device, which comprises a pipeline and a leakage hole, wherein the front end and the rear end of the pipeline are communicated with an external conveying device, and the leakage hole is positioned at the top end of the pipeline and is communicated with the inner wall of the pipeline; the pipe fitting device also comprises an upper pressing plate, a lower pressing plate, a sliding bin, a stud, a connecting block, a sealing block, a connecting sleeve and an adjusting nut, wherein the upper pressing plate and the lower pressing plate are in a semicircular shape, the right end of the upper pressing plate and the right end of the lower pressing plate are rotatably connected through a rotating device, the left end of the upper pressing plate and the left end of the lower pressing plate are in clamping connection through a fastening device, the inner wall of the upper pressing plate and the inner wall of the lower pressing plate are both tightly attached to the outer wall of a pipeline, the bottom end of the sliding bin is connected with the middle part of the top end of the upper pressing plate, a first cavity is arranged inside the sliding bin, the bottom end of the first cavity is communicated with the inner wall of the upper pressing plate, the bottom end of the stud is positioned inside the first cavity, the bottom end of the stud is connected with the top end of the connecting block, the connecting block is in a square shape, the top end of the stud penetrates through the top end of the first cavity and the connecting sleeve and extends out of the upper portion of the sliding bin, the upper side of the stud can slide relative to the sliding bin and the connecting sleeve respectively, the adjusting nut is sleeved on the upper side of the stud in a threaded mode, and the bottom end of the adjusting nut is rotatably connected with the top end of the connecting sleeve.
The utility model discloses a pipeline plugging device, still including the monitoring storehouse, monitoring devices and gland, the right-hand member in monitoring storehouse is connected with the left end middle part in slip storehouse, the inside in monitoring storehouse is provided with the second cavity, the right-hand member of second cavity and the left end middle part intercommunication of first cavity, monitoring devices installs on the top right side in monitoring storehouse and communicates with the second cavity, the left end intercommunication of second cavity is provided with the maintenance mouth, the gland lid is adorned at the left end of maintenance mouth, the right-hand member of gland passes through first bolt fixed connection with the left end in monitoring storehouse.
The utility model discloses a pipeline plugging device still includes spring, spherical end cap and baffle, and the spring is located second cavity left side, and the left end of spring is connected with the right-hand member middle part of gland, and the right-hand member of spring is connected with spherical end cap's left end, and the baffle is vertical to be installed at the middle part of second cavity, and the through-hole that runs through about the middle part of baffle is provided with, and spherical end cap's right-hand member pastes tightly and carries out the shutoff to the left end of through-hole with the left end of through-hole, and the bottom left side intercommunication in monitoring storehouse is provided with.
The utility model discloses a pipeline plugging device, clamping device include punch holder, lower plate, second bolt and the nut of screwing, and the right-hand member of punch holder and the right-hand member of lower plate are connected with the left end of punch holder and the left end of lower plate respectively, and the bottom of second bolt is passed punch holder and lower plate and is stretched out to the below of lower plate, and the nut spiral shell dress cover of screwing is established at second bolt downside, and the top of the nut of screwing is pasted tightly with the bottom of lower plate.
The utility model discloses a pipeline plugging device, rotating device include last rotation block, lower rotation block and insert the axle, and the top of going up the rotation block is connected with the right-hand member rear side of top board, and the bottom of lower rotation block is connected with the right-hand member front side of holding down plate, and the rear end of inserting the axle passes the upside of lower rotation block and the downside of going up the rotation block, inserts axle and lower rotation block fixed connection, inserts axle and last rotation block rotatable coupling.
The utility model discloses a pipeline plugging device still includes the limiting plate, and the bottom of limiting plate is connected with the top of double-screw bolt.
The utility model discloses a pipeline plugging device still includes heating rod and energy supply device, and the bottom of heating rod is located the pipeline external world, and the top of heating rod is connected with energy supply device's bottom.
The utility model discloses a pipeline plugging device still includes the handle, and the bottom and the top of energy supply device of handle are connected.
The utility model discloses a pipeline plugging device still includes the switch, and the right-hand member of switch is connected with energy supply device's left end.
The utility model discloses a pipeline plugging device still includes the sealing washer, and the sealing washer is located the external world of sealed piece, and the top and the inside outside of top board of sealing washer are connected, the bottom and the contact of pipeline upside outer wall of sealing washer.
Compared with the prior art, the beneficial effects of the utility model are that: the rotary adjusting nut, adjusting nut and double-screw bolt spiral shell dress are connected, adjusting nut drives the double-screw bolt and moves down, the double-screw bolt promotes the connecting block and moves down, the connecting block drives sealed piece and moves down, the bottom of sealed piece contacts and compresses tightly sealedly with the top of leakage port, leak stoppage fast through the leak hole on the pipeline, reduce the leakage quantity of material in the pipeline, reduce resource loss, need not to close whole conveying system simultaneously, reduce the loss of property that the closed conveying system leads to, save the leaking stoppage time, improve the pipeline seal effect simultaneously, practicality and reliability are improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged schematic view of the sliding chamber of FIG. 1;
FIG. 3 is a schematic view of the bottom enlarged view of the upper platen of FIG. 1;
FIG. 4 is a right enlarged view of the upper platen of FIG. 1;
in the drawings, the reference numbers: 1. a pipeline; 2. a leakage port; 3. an upper pressure plate; 4. a lower pressing plate; 5. a sliding bin; 6. a stud; 7. connecting blocks; 8. a sealing block; 9. connecting sleeves; 10. adjusting the nut; 11. monitoring a bin; 12. a monitoring device; 13. a gland; 14. a first bolt; 15. a spring; 16. a spherical plug; 17. a baffle plate; 18. an upper splint; 19. a lower splint; 20. a second bolt; 21. screwing the nut; 22. an upper rotating block; 23. a lower rotation block; 24. inserting a shaft; 25. a heating rod; 26. an energy supply device; 27. a handle; 28. a switch; 29. a seal ring; 30. and a limiting plate.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, the pipeline leakage stopping device of the present invention comprises a pipeline 1 and a leakage port 2, wherein the front end and the rear end of the pipeline 1 are communicated with an external conveying device, and the leakage port 2 is located at the top end of the pipeline 1 and is communicated with the inner wall of the pipeline 1; the pipe fitting structure further comprises an upper pressing plate 3, a lower pressing plate 4, a sliding bin 5, a stud 6, a connecting block 7, a sealing block 8, a connecting sleeve 9 and an adjusting nut 10, wherein the upper pressing plate 3 and the lower pressing plate 4 are both in a semicircular shape, the right end of the upper pressing plate 3 is rotatably connected with the right end of the lower pressing plate 4 through a rotating device, the left end of the upper pressing plate 3 is connected with the left end of the lower pressing plate 4 through a fastening device in a clamping manner, the inner wall of the upper pressing plate 3 and the inner wall of the lower pressing plate 4 are both tightly attached to the outer wall of the pipe 1, the bottom end of the sliding bin 5 is connected with the middle part of the top end of the upper pressing plate 3, a first cavity is arranged inside the sliding bin 5, the bottom end of the first cavity is communicated with the inner wall of the upper pressing plate 3, the bottom end of the stud 6 is located inside the first cavity, the bottom end of the stud 6 is connected with the top end, the bottom end of the connecting block 7 is connected with the top end of the sealing block 8, the connecting sleeve 9 is installed in the middle of the top end of the sliding bin 5, the top end of the stud 6 penetrates through the top end of the first cavity and the connecting sleeve 9 and extends out of the upper portion of the sliding bin 5, the upper side of the stud 6 can slide relative to the sliding bin 5 and the connecting sleeve 9 respectively, the adjusting nut 10 is sleeved on the upper side of the stud 6 in a threaded mode, and the bottom end of the adjusting nut 10 is rotatably connected with the top end of the connecting sleeve; the rotary adjusting nut, adjusting nut and double-screw bolt spiral shell dress are connected, adjusting nut drives the double-screw bolt and moves down, the double-screw bolt promotes the connecting block and moves down, the connecting block drives sealed piece and moves down, the bottom of sealed piece contacts and compresses tightly sealedly with the top of leakage port, leak stoppage fast through the leak hole on the pipeline, reduce the leakage quantity of material in the pipeline, reduce resource loss, need not to close whole conveying system simultaneously, reduce the loss of property that the closed conveying system leads to, save the leaking stoppage time, improve the pipeline seal effect simultaneously, practicality and reliability are improved.
The utility model discloses a pipeline plugging device, still include monitoring storehouse 11, monitoring devices 12 and gland 13, the right-hand member of monitoring storehouse 11 is connected with the left end middle part of sliding bin 5, the inside of monitoring storehouse 11 is provided with the second cavity, the right-hand member of second cavity communicates with the left end middle part of first cavity, monitoring devices 12 are installed on the top right side of monitoring storehouse 11 and communicate with the second cavity, the left end intercommunication of second cavity is provided with the maintenance mouth, gland 13 lid dress is in the left end of maintenance mouth, the right-hand member of gland 13 and the left end of monitoring storehouse 11 are through first bolt 14 fixed connection; inside material in the pipeline got into first cavity through leaking the leakage mouth, inside material in the first cavity got into the second cavity, monitoring devices detected and sent alarm signal to the material in the second cavity, through setting up monitoring devices, can leak the pipeline and effectively monitor, through opening gland and first bolt, can clear up the inside of second cavity, improve the practicality.
The utility model discloses a pipeline plugging device, still include spring 15, spherical end cap 16 and baffle 17, spring 15 is located the second cavity left side, the left end of spring 15 is connected with the right-hand member middle part of gland 13, the right-hand member of spring 15 is connected with the left end of spherical end cap 16, baffle 17 is vertically installed in the middle part of second cavity, the middle part of baffle 17 is provided with the through-hole that runs through from side to side, the right-hand member of spherical end cap 16 pastes tightly and blocks up the left end of through-hole with the left end of through-hole, the bottom left side intercommunication of monitoring storehouse 11 is provided with the delivery pipe; when there is the material of carrying in the pipeline in the second cavity, the material in the second cavity promotes spherical end cap through the through-hole and removes left, and spherical end cap produces the compression effect to the spring, and the material flows to second cavity left side through the through-hole and through inside the delivery pipe discharge to external collection device, and when the inside idle work of second cavity, the spring promotes spherical end cap and carries out the shutoff to the left end of through-hole, prevents that external material from getting into second cavity right side through the delivery pipe, improves the practicality.
The utility model discloses a pipeline plugging device, clamping device include upper plate 18, lower plate 19, second bolt 20 and screw nut 21, the right-hand member of upper plate 18 and the right-hand member of lower plate 19 are connected with the left end of upper plate 3 and the left end of lower clamp plate 4 respectively, the bottom of second bolt 20 passes upper plate 18 and lower plate 19 and stretches out to the below of lower plate 19, screw nut 21 spiral shell cover is established at second bolt 20 downside, the top of screw nut 21 pastes tightly with the bottom of lower plate 19; through screwing the nut, the upper plate and the lower plate are clamped through the second bolt, the upper plate and the lower plate respectively drive the upper pressing plate and the lower pressing plate to clamp the outer wall of the pipeline, and the practicability is improved.
The utility model discloses a pipeline plugging device, rotating device include last rotating block 22, lower rotating block 23 and insert axle 24, the top of going up rotating block 22 is connected with the right-hand member rear side of top board 3, the bottom of lower rotating block 23 is connected with the right-hand member front side of holding down plate 4, the rear end of insert axle 24 passes the upside of lower rotating block 23 and the downside of last rotating block 22, insert axle 24 and lower rotating block 23 fixed connection, insert axle 24 and last rotating block 22 rotatable coupling; through setting up rotation block, lower rotation block and inserting the axle, but the tight and opening work of clamp of top board and holding down plate improves the practicality.
The utility model discloses a pipeline plugging device, still include limiting plate 30, the bottom of limiting plate 30 is connected with the top of double-screw bolt 6; through setting up the limiting plate, when can preventing that the double-screw bolt from moving downwards, the bottom of limiting plate and adjusting nut's top contact can prevent effectively that the top of double-screw bolt from breaking away from with adjusting nut, improve the practicality.
The utility model discloses a pipeline plugging device, which also comprises a heating rod 25 and an energy supply device 26, wherein the bottom end of the heating rod 25 is positioned outside the pipeline 1, and the top end of the heating rod 25 is connected with the bottom end of the energy supply device 26; manually take up energy supply unit, make the bottom of heating rod and the top contact of limiting plate, generate heat through energy supply unit control heating rod, the heating rod passes through the limiting plate with the heat, double-screw bolt and connecting block transmit to sealed piece on, make sealed piece soften, sealed piece bottom after softening is more abundant with the top contact of leakage opening, sealed piece improves the sealed effect of leakage opening, the artifical bottom that makes the heating rod simultaneously separates with the top of limiting plate, can end the heating to sealed piece, through setting up heating rod and energy supply unit, can soften the effect to sealed piece, heating rod and energy supply unit repeatedly usable simultaneously, the high practicality is improved.
The utility model discloses a pipeline plugging device, which also comprises a handle 27, wherein the bottom end of the handle 27 is connected with the top end of an energy supply device 26; through setting up the handle, can make things convenient for the manual work to take up energy supply device, reduce the risk that the heating rod of the state of generating heat caused the scald to the human body, improve the practicality.
The utility model discloses a pipeline plugging device, which also comprises a switch 28, wherein the right end of the switch 28 is connected with the left end of an energy supply device 26; through setting up the switch, can make things convenient for the manual work to open the heating rod through press switch, conveniently control the heating rod, improve the practicality.
The utility model discloses a pipeline plugging device, still include the sealing washer 29, the sealing washer 29 is located the external world of seal block 8, the top of sealing washer 29 is connected with the inside outside of top board 3, the bottom of sealing washer 29 contacts with the upper side outer wall of pipeline 1; through setting up the sealing washer, can carry out secondary seal to the pipeline position of leaking, improve sealed effect, improve practicality and reliability.
The utility model discloses a pipeline plugging device, it is at the during operation, at first the manual work is through the handle take up the heating rod, open the switch, the heating rod produces the heat, the heating rod passes through the limiting plate, double-screw bolt and connecting block heat sealed piece, sealed piece is softened, take away from the heating rod through the handle, rotary adjusting nut, adjusting nut and double-screw bolt spiral shell dress are connected, adjusting nut drives double-screw bolt downstream, the double-screw bolt promotes the connecting block downstream, the connecting block drives sealed piece downstream, the bottom of sealed piece after softening and the top contact of leakage opening and compression seal can.
The installation mode, the connection mode or the arrangement mode of the pipeline leakage stopping device of the utility model are common mechanical modes, and the pipeline leakage stopping device can be implemented as long as the beneficial effects can be achieved; monitoring devices, energy supply devices and switches are commercially available.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A pipeline leakage plugging device comprises a pipeline (1) and a leakage opening (2), wherein the front end and the rear end of the pipeline (1) are communicated with an external conveying device, and the leakage opening (2) is positioned at the top end of the pipeline (1) and is communicated with the inner wall of the pipeline (1); the device is characterized by further comprising an upper pressing plate (3), a lower pressing plate (4), a sliding bin (5), a stud (6), a connecting block (7), a sealing block (8), a connecting sleeve (9) and an adjusting nut (10), wherein the upper pressing plate (3) and the lower pressing plate (4) are in a semicircular shape, the right end of the upper pressing plate (3) and the right end of the lower pressing plate (4) are rotatably connected through a rotating device, the left end of the upper pressing plate (3) and the left end of the lower pressing plate (4) are in clamping connection through a fastening device, the inner wall of the upper pressing plate (3) and the inner wall of the lower pressing plate (4) are tightly attached to the outer wall of the pipeline (1), the bottom end of the sliding bin (5) is connected with the middle of the top end of the upper pressing plate (3), a first cavity is arranged inside the sliding bin (5), the bottom end of the first cavity is communicated with the inner wall of the upper pressing plate (3), the bottom of double-screw bolt (6) is connected with the top of connecting block (7), the shape and the first cavity inner wall shape of connecting block (7) are the same and square, connecting block (7) can slide from top to bottom with first cavity, the bottom of connecting block (7) is connected with the top of sealed piece (8), the top middle part in slip bin (5) is installed in adapter sleeve (9), first cavity top and adapter sleeve (9) are passed and stretch out to the top in slip bin (5) on the top of double-screw bolt (6), the upside of double-screw bolt (6) respectively with slip bin (5) and adapter sleeve (9) slidable relatively, adjusting nut (10) spiral shell cover is established at double-screw bolt (6) upside, the bottom of adjusting nut (10) and the top rotatable coupling of adapter sleeve (9).
2. The pipeline leakage stoppage device as recited in claim 1, further comprising a monitoring bin (11), a monitoring device (12) and a pressing cover (13), wherein the right end of the monitoring bin (11) is connected with the middle part of the left end of the sliding bin (5), a second cavity is arranged inside the monitoring bin (11), the right end of the second cavity is communicated with the middle part of the left end of the first cavity, the monitoring device (12) is installed on the right side of the top end of the monitoring bin (11) and is communicated with the second cavity, a maintenance opening is arranged at the left end of the second cavity in a communicated manner, the pressing cover (13) is covered at the left end of the maintenance opening, and the right end of the pressing cover (13) is fixedly connected with the left end of the monitoring bin (11) through a first bolt (14).
3. The pipeline leakage stopping device as claimed in claim 2, further comprising a spring (15), a spherical plug (16) and a baffle (17), wherein the spring (15) is located on the left side of the second cavity, the left end of the spring (15) is connected with the middle part of the right end of the gland (13), the right end of the spring (15) is connected with the left end of the spherical plug (16), the baffle (17) is vertically installed in the middle of the second cavity, a through hole penetrating left and right is formed in the middle of the baffle (17), the right end of the spherical plug (16) is tightly attached to and blocks the left end of the through hole, and a discharge pipe is communicated with the left side of the bottom end of the monitoring bin (11).
4. The pipeline leakage stopping device as claimed in claim 3, wherein the clamping device comprises an upper clamping plate (18), a lower clamping plate (19), a second bolt (20) and a screwing nut (21), the right end of the upper clamping plate (18) and the right end of the lower clamping plate (19) are respectively connected with the left end of the upper clamping plate (3) and the left end of the lower clamping plate (4), the bottom end of the second bolt (20) penetrates through the upper clamping plate (18) and the lower clamping plate (19) and extends to the lower side of the lower clamping plate (19), the screwing nut (21) is sleeved on the lower side of the second bolt (20), and the top end of the screwing nut (21) is tightly attached to the bottom end of the lower clamping plate (19).
5. The pipeline leakage stoppage device according to claim 4, wherein the rotating device comprises an upper rotating block (22), a lower rotating block (23) and an inserting shaft (24), the top end of the upper rotating block (22) is connected with the rear side of the right end of the upper pressing plate (3), the bottom end of the lower rotating block (23) is connected with the front side of the right end of the lower pressing plate (4), the rear end of the inserting shaft (24) penetrates through the upper side of the lower rotating block (23) and the lower side of the upper rotating block (22), the inserting shaft (24) is fixedly connected with the lower rotating block (23), and the inserting shaft (24) is rotatably connected with the upper rotating block (22).
6. The pipeline leakage stoppage device according to claim 5, further comprising a limiting plate (30), wherein the bottom end of the limiting plate (30) is connected with the top end of the stud (6).
7. A pipeline leakage stopping device as claimed in claim 6, further comprising a heating rod (25) and an energy supply device (26), wherein the bottom end of the heating rod (25) is located outside the pipeline (1), and the top end of the heating rod (25) is connected with the bottom end of the energy supply device (26).
8. A pipeline plugging device according to claim 7, further comprising a handle (27), wherein the bottom end of the handle (27) is connected with the top end of the energy supply device (26).
9. The pipeline leakage stopping device as recited in claim 8, further comprising a switch (28), wherein the right end of the switch (28) is connected to the left end of the energy supply device (26).
10. The pipeline leakage stopping device as claimed in claim 9, further comprising a sealing ring (29), wherein the sealing ring (29) is located outside the sealing block (8), the top end of the sealing ring (29) is connected with the inner outer side of the upper pressure plate (3), and the bottom end of the sealing ring (29) is in contact with the outer wall of the upper side of the pipeline (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201920770360.8U CN210600665U (en) | 2019-05-27 | 2019-05-27 | Pipeline plugging device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201920770360.8U CN210600665U (en) | 2019-05-27 | 2019-05-27 | Pipeline plugging device |
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CN210600665U true CN210600665U (en) | 2020-05-22 |
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CN201920770360.8U Expired - Fee Related CN210600665U (en) | 2019-05-27 | 2019-05-27 | Pipeline plugging device |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111720746A (en) * | 2020-06-23 | 2020-09-29 | 绍兴市能源检测院 | Harmful gas pipeline leakage emergency treatment device for printing and dyeing industry |
CN112161201A (en) * | 2020-09-21 | 2021-01-01 | 湖南省大地泵业有限公司 | Sewage treatment equipment capable of preventing recontamination |
-
2019
- 2019-05-27 CN CN201920770360.8U patent/CN210600665U/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111720746A (en) * | 2020-06-23 | 2020-09-29 | 绍兴市能源检测院 | Harmful gas pipeline leakage emergency treatment device for printing and dyeing industry |
CN112161201A (en) * | 2020-09-21 | 2021-01-01 | 湖南省大地泵业有限公司 | Sewage treatment equipment capable of preventing recontamination |
CN112161201B (en) * | 2020-09-21 | 2023-01-24 | 湖南省大地泵业有限公司 | Sewage treatment equipment capable of preventing recontamination |
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Granted publication date: 20200522 Termination date: 20210527 |
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