CN112833272A - Pipeline universal vibration reduction and isolation device and using method thereof - Google Patents
Pipeline universal vibration reduction and isolation device and using method thereof Download PDFInfo
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- CN112833272A CN112833272A CN202110369912.6A CN202110369912A CN112833272A CN 112833272 A CN112833272 A CN 112833272A CN 202110369912 A CN202110369912 A CN 202110369912A CN 112833272 A CN112833272 A CN 112833272A
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- damping
- pipe
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- rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/035—Noise absorbers in the form of specially adapted hangers or supports
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a universal vibration-damping vibration isolator for a pipeline and a use method thereof, and the universal vibration isolator comprises an omega-shaped vibration-damping and vibration-damping block, a pipeline body, a support column, a base, a protective pad, a support rod, an adjusting pipe, a wing screw, a protective plate, an adjustable pipeline supporting hoop structure, a vibration-damping protective branch pipe structure and an adjustable protective stay rope structure, wherein the omega-shaped vibration-damping and vibration-damping block is screwed on the periphery inside the universal vibration isolator, the pipeline body is arranged inside the universal vibration isolator through the omega-shaped vibration-damping and vibration-damping block, one longitudinal end of the support column is in threaded connection with the middle part of the upper part of the base, the other longitudinal end of the support column is in threaded connection with the middle part of the lower. The anti-damage piece, the pipeline hoop, the adjustable rod, the connecting pipe, the fastening bolt and the transverse seat are arranged, so that the pipeline body with different diameters can be fixed and clamped conveniently, and the support stability is ensured.
Description
Technical Field
The invention belongs to the technical field of pipeline vibration damping and isolating equipment, and particularly relates to a universal vibration damping and isolating device for a pipeline and a using method of the universal vibration damping and isolating device.
Background
With the widespread use of pressure pipelines in industrial enterprises, some common problems associated with pipeline fluids are gradually valued.
At present, under the action of fluid with certain pressure and flow rate, unsteady pipe flow in a pipeline can cause the problems of vibration of a pipeline system and the like. The pipeline vibration is caused by complex reasons, and the pipeline vibration can generate certain influence on the safety and the service life of the pipeline, so that the pipeline vibration damping vibration isolator is applied to the pipeline universal vibration damping vibration isolator.
But the problem that the existing vibration reduction vibration isolator cannot fix pipelines with different diameters, and has poor vibration reduction and isolation effect and poor protection effect is also solved.
Therefore, the invention provides a universal vibration-damping vibration isolator for pipelines and a using method thereof, which are very necessary.
Disclosure of Invention
The invention provides a universal vibration-damping vibration isolator for pipelines and a using method thereof, which can solve the problem that the vibration-damping vibration isolator fixes pipelines with different diameters and can improve the problems of poor vibration-damping and vibration-damping effect and poor protection effect.
In order to achieve the above object, the present invention adopts the following technical solutions.
A universal vibration-damping vibration isolator for a pipeline comprises a universal vibration isolator, an omega-shaped damping vibration-damping block, a pipeline body, a support column, a base, a protective pad, a support rod, an adjusting tube, a thumb screw, a protective plate, an adjustable pipeline support hoop structure, a vibration-damping protective branch tube structure and an adjustable protective stay cord structure, wherein the omega-shaped damping vibration-damping block is connected with the periphery of the interior of the universal vibration isolator by screws; the pipeline body is arranged inside the universal vibration isolator through the omega-shaped damping vibration isolation block; one end of the support column in the longitudinal direction is in threaded connection with the middle part of the upper part of the base, and the other end of the support column is in threaded connection with the middle part of the lower part of the universal vibration isolator; the four corners of the bottom of the base are all glued with protective pads; one longitudinal end of the supporting rod is inserted into the adjusting pipe and is fastened and connected through a wing-shaped screw, and the other end of the supporting rod is connected to the middle part of the lower part of the protection plate through a bolt; the lower end of the support rod in the longitudinal direction is in threaded connection with the middle part of the upper part of the universal vibration isolator; the adjustable pipeline supporting hoop structure is connected with the universal vibration isolator; the vibration reduction protection branch pipe structure is connected with the base; the adjustable protective pull rope structure is connected with the protective plate; the adjustable pipeline supporting hoop structures are four in number and respectively comprise an anti-damage sheet, a pipeline hoop, an adjustable rod, a connecting pipe, a fastening bolt and a transverse seat, wherein the anti-damage sheets are glued on the inner wall of the pipeline hoop; the pipeline hoop is in threaded connection with the lower end of the adjustable rod; the adjustable rod is longitudinally inserted in the connecting pipe and is fastened and connected through a fastening bolt; the connecting pipe is connected with the outer end of the transverse seat through a bolt.
Preferably, the vibration reduction protection branch pipe structures are provided with two, each vibration reduction protection branch pipe structure comprises a protection sleeve, a buffer rod, a vibration reduction buffer spring, a baffle ring, a support liner pipe and a baffle block, and the protection sleeves are in threaded connection with the upper ends of the buffer rods; the outer wall of the buffer rod is sleeved with a buffer damping spring; the baffle ring is sleeved in an annular groove formed in the outer wall of the lower end of the buffer rod; the buffer rod is longitudinally inserted into the supporting liner tube; the left wall and the right wall of the upper part of the inner side of the supporting liner tube are both connected with check blocks through screws.
Preferably, the adjustable protective pull rope structure comprises a stop cap, a protective pull rope body, a linking pipe, an adjusting bolt, a draw hook and a pull ring, wherein the stop cap is connected to the upper end of the protective pull rope body through a screw; one end of the protective pull rope body is inserted in the connecting pipe and is fastened and connected through an adjusting bolt, and the other end of the protective pull rope body is tied with a drag hook; the draw hook is hung inside the pull ring.
Preferably, the anti-injury sheet is a rubber sheet, and the pipeline hoop is a semicircular aluminum alloy hoop.
Preferably, the transverse seats are connected to the upper part and the lower part of the left side of the universal vibration isolator and the upper part and the lower part of the right side of the universal vibration isolator through transverse bolts.
Preferably, the pipeline embracing ring is clasped to the upper part and the lower part of the outer side of the pipeline body through the injury-preventing sheets.
Preferably, the protective sleeve is a rubber sleeve and is sleeved outside the pipeline body.
Preferably, the buffer rod is an aluminum alloy rod, and the buffer damping spring is a cylindrical stainless steel spring and is positioned between the protective sleeve and the supporting liner tube.
Preferably, the lower longitudinal ends of the supporting liner tubes are in threaded connection with the middle parts of the left side and the right side of the upper part of the base.
Preferably, the pull ring is bolted to the upper part of the protective sleeve.
The utility model provides an universal damping isolator of pipeline, relaxs fastening bolt, adjusts adjustable pole at the inside shift position of connecting pipe, after the determination position, locking fastening bolt can embrace the ring through preventing hindering the piece through the pipeline and embrace the pipeline body, and locking fastening bolt at last guarantees the support stability, if the pipeline body takes place to vibrate.
The invention has the beneficial effects that:
the invention can solve the problem that the vibration-damping vibration isolator fixes pipelines with different diameters, and can improve the problems of poor vibration-damping and vibration-isolating effect and poor protection effect.
The specific beneficial effects of some specific components in the invention are as follows:
1. in the invention, the arrangement of the anti-damage sheet, the pipeline hoop, the adjustable rod, the connecting pipe, the fastening bolt and the transverse seat is favorable for fixedly clamping pipeline bodies with different diameters so as to ensure the support stability.
2. In the invention, the protective sleeve, the buffer rod, the buffer vibration-damping spring, the baffle ring, the support liner tube and the baffle block are arranged, thereby being beneficial to improving the vibration-damping and vibration-isolating capability.
3. According to the invention, the arrangement of the retaining cap, the protective pull rope body, the connecting pipe, the adjusting bolt, the drag hook and the pull ring is favorable for ensuring good protective effect, and the pipe can be stretched to avoid the sagging problem of the pipe.
4. In the invention, the arrangement of the universal vibration isolator and the omega-shaped damping vibration isolation block is beneficial to improving the vibration isolation and damping effect.
5. In the invention, the arrangement of the supporting column and the base is favorable for playing a good role in supporting stability.
6. According to the invention, the arrangement of the protective pad is favorable for playing a good anti-skid role.
7. According to the invention, the arrangement of the supporting rod, the adjusting pipe, the wing-shaped screw and the protection plate is beneficial to supporting and adjusting, and the protection effect is ensured.
8. According to the invention, the arrangement of the protection plate is beneficial to ensuring the protection capability.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic structural diagram of an adjustable pipe support hoop structure according to the present invention.
Fig. 3 is a structural schematic diagram of the vibration damping protective branch pipe structure of the invention.
Fig. 4 is a schematic structural view of an adjustable protection rope structure of the invention.
In the figure:
1. a universal vibration isolator; 2. an omega-shaped damping vibration isolation block; 3. a pipe body; 4. a support pillar; 5. a base; 6. a protective pad; 7. a support bar; 8. an adjusting tube; 9. a thumb screw; 10. a protection plate; 11. the adjustable pipeline supports the hoop structure; 111. a protective sheet; 112. looping a pipeline; 113. an adjustable lever; 114. a connecting pipe; 115. fastening a bolt; 116. a transverse seat; 12. a vibration damping protection branch pipe structure; 121. a protective sleeve; 122. a buffer rod; 123. a buffer damping spring; 124. a baffle ring; 125. supporting the liner tube; 126. a stopper; 13. the structure of the adjustable protective pull rope; 131. a blocking cap; 132. a protective pull rope body; 133. connecting the pipe; 134. adjusting the bolt; 135. pulling a hook; 136. and (4) a pull ring.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings.
As shown in fig. 1 and fig. 2, a universal vibration-damping and vibration-isolating device for a pipeline comprises a universal vibration-isolating device 1, an omega-shaped vibration-damping and vibration-isolating block 2, a pipeline body 3, a support column 4, a base 5, a protective pad 6, a support rod 7, an adjusting tube 8, a wing-shaped screw 9, a protective plate 10, an adjustable pipeline supporting hoop structure 11, a vibration-damping protective branch tube structure 12 and an adjustable protective pull rope structure 13, wherein the omega-shaped vibration-damping and vibration-isolating block 2 is in screwed connection with the periphery of the interior of the universal vibration-isolating device 1; the pipeline body 3 is arranged inside the universal vibration isolator 1 through the omega-shaped damping vibration isolation block 2; one end of the support column 4 in the longitudinal direction is in threaded connection with the middle part of the upper part of the base 5, and the other end of the support column is in threaded connection with the middle part of the lower part of the universal vibration isolator 1; the four corners of the bottom of the base 5 are all glued with protective pads 6; one longitudinal end of the supporting rod 7 is inserted in the adjusting pipe 8 and is fastened and connected through a wing-shaped screw 9, and the other end of the supporting rod is connected to the middle of the lower part of the protection plate 10 through a bolt; the lower end of the support rod 7 in the longitudinal direction is in threaded connection with the middle part of the upper part of the universal vibration isolator 1; the adjustable pipeline supporting hoop structure 11 is connected with the universal vibration isolator 1; the vibration-damping protection branch pipe structure 12 is connected with the base 5; the adjustable protective pull rope structure 13 is connected with the protective plate 10; the adjustable pipeline supporting hoop structures 11 are four in number and respectively comprise an anti-injury sheet 111, a pipeline hoop 112, an adjustable rod 113, a connecting pipe 114, a fastening bolt 115 and a transverse seat 116, wherein the anti-injury sheets 111 are glued on the inner wall of the pipeline hoop 112; the pipeline hoop 112 is in threaded connection with the lower end of the adjustable rod 113; the adjustable rod 113 is longitudinally inserted into the connecting pipe 114 and is fastened and connected by a fastening bolt 115; the connecting pipe 114 is connected to the outer end of the transverse seat 116 through a bolt, the fastening bolt 115 is loosened according to the pipeline bodies 3 with different diameters, the moving position of the adjustable rod 113 inside the connecting pipe 114 can be adjusted, the fastening bolt 115 is locked after the position is determined, the pipeline body 3 can be embraced through the pipeline embracing ring 112 through the injury prevention piece 111, and finally the fastening bolt 115 is locked, so that the supporting stability is ensured.
In this embodiment, referring to fig. 3, two vibration damping and protecting branch pipe structures 12 are provided, and each vibration damping and protecting branch pipe structure includes a protecting sleeve 121, a buffering rod 122, a buffering vibration damping spring 123, a baffle ring 124, a supporting liner pipe 125 and a stopper 126, where the protecting sleeve 121 is screwed on the upper end of the buffering rod 122; the outer wall of the buffer rod 122 is sleeved with a buffer damping spring 123; the baffle ring 124 is sleeved in an annular groove formed in the outer wall of the lower end of the buffer rod 122; the buffer rod 122 is longitudinally inserted into the interior of the supporting liner tube 125; support bushing pipe 125's two equal screwed connection in wall on the inboard upper portion have dog 126, if pipeline body 3 takes place the vibration, can make lag 121 drive buffer rod 122 move in buffering damping spring 123 is inside, buffer rod 122 moves in supporting bushing pipe 125 inside simultaneously to guarantee buffering damping effect, can play good vibration isolation effect to pipeline body 3 through universal isolator 1 and "omega" shape damping vibration isolation piece 2 simultaneously, guarantee the vibration isolation effect.
In this embodiment, referring to fig. 4, the adjustable protection rope structure 13 includes a stop cap 131, a protection rope body 132, a connecting tube 133, an adjusting bolt 134, a draw hook 135 and a pull ring 136, wherein the stop cap 131 is screwed to the upper end of the protection rope body 132; one end of the protection pull rope body 132 is inserted into the connecting pipe 133 and is fastened and connected through an adjusting bolt 134, and the other end is tied with a draw hook 135; the drag hook 135 articulate in the inside of pull ring 136, in order to guarantee the support stability of pipeline body 3, adjusting bolt 134 is loosened to the accessible, and handheld fender cap 131 removes the position of adjusting protection stay cord body 132 in linking pipe 133 is inside for protection stay cord body 132 pulling drag hook 135 and pull ring 136 move, hold the effect with guaranteeing to draw, lock adjusting bolt 134 at last, guarantee the protection effect.
In this embodiment, specifically, the damage prevention sheet 111 is a rubber sheet, and the pipe hoop 112 is a semicircular aluminum alloy hoop.
In this embodiment, specifically, the horizontal seats 116 are both connected to the upper and lower left sides of the universal vibration isolator 1 and the upper and lower right sides of the universal vibration isolator 1 by horizontal bolts.
In this embodiment, specifically, the pipe hoop 112 is clasped to the upper and lower parts of the outer side of the pipe body 3 through the injury-preventing piece 111.
In this embodiment, specifically, the protecting jacket 121 is a rubber jacket and is sleeved outside the pipeline body 3.
In this embodiment, specifically, the buffer rod 122 is an aluminum alloy rod, and the buffer damping spring 123 is a cylindrical stainless steel spring and is located between the protective sleeve 121 and the support liner 125.
In this embodiment, specifically, the lower ends of the supporting liner tubes 125 are screwed to the middle portions of the left and right sides of the upper portion of the base 5.
In this embodiment, specifically, the pull ring 136 is bolted to the upper part of the protection cover 121.
In this embodiment, specifically, the connecting pipes 133 are longitudinally bolted to the left and right ends of the fender panel 10.
In this embodiment, specifically, the protection pad 6 is a rubber pad.
In this embodiment, specifically, the protection plate 10 is made of an aluminum alloy plate.
In this embodiment, specifically, the protective pull rope body 132 is an oil wire rope or a hemp rope.
In the invention, according to the pipeline bodies 3 with different diameters, the fastening bolt 115 is loosened, the moving position of the adjustable rod 113 in the connecting pipe 114 can be adjusted, after the position is determined, the fastening bolt 115 is locked, namely the pipeline body 3 can be clasped by the pipeline clasping ring 112 through the injury-preventing sheet 111, finally the fastening bolt 115 is locked, the supporting stability is ensured, if the pipeline body 3 vibrates, the protective sleeve 121 can drive the buffer rod 122 to move in the buffer vibration-damping spring 123, and simultaneously the buffer rod 122 moves in the supporting liner tube 125 to ensure the buffer vibration-damping effect, meanwhile, the universal vibration isolator 1 and the omega-shaped buffer vibration-damping block 2 can play a good vibration-isolating role on the pipeline body 3 to ensure the vibration-isolating effect, in order to ensure the supporting stability of the pipeline body 3, the position of the protective pull rope body 132 in the connecting pipe 133 can be adjusted by loosening the adjusting bolt 134 and holding the blocking cap 131 by hand, so that the protective pull rope body 132 pulls the drag hook 135 and the pull ring 136 to act, the pulling effect is ensured, and finally the adjusting bolt 134 is locked, and the protective effect is ensured.
The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.
Claims (10)
1. The universal vibration damping and isolating device for the pipeline is characterized by comprising a universal vibration damping and isolating device (1), an omega-shaped damping and isolating block (2), a pipeline body (3), a supporting column (4), a base (5), a protecting pad (6), a supporting rod (7), an adjusting pipe (8), a wing-shaped screw (9), a protecting plate (10), an adjustable pipeline supporting and embracing ring structure (11), a vibration damping and protecting branch pipe structure (12) and an adjustable protecting pull rope structure (13), wherein the omega-shaped damping and isolating block (2) is connected with the periphery of the inside of the universal vibration damping and isolating device (1) in a screw connection mode; the pipeline body (3) is arranged inside the universal vibration isolator (1) through the omega-shaped damping vibration isolation block (2); one end of the support column (4) in the longitudinal direction is in threaded connection with the middle part of the upper part of the base (5), and the other end of the support column is in threaded connection with the middle part of the lower part of the universal vibration isolator (1); the four corners of the bottom of the base (5) are all glued with protective pads (6); one longitudinal end of the supporting rod (7) is inserted into the adjusting pipe (8) and is fastened and connected through a wing-shaped screw (9), and the other end of the supporting rod is connected to the middle of the lower part of the protection plate (10) through a bolt; the lower end of the support rod (7) in the longitudinal direction is in threaded connection with the middle part of the upper part of the universal vibration isolator (1); the adjustable pipeline supporting hoop structure (11) is connected with the universal vibration isolator (1); the vibration-damping protection branch pipe structure (12) is connected with the base (5); the adjustable protective pull rope structure (13) is connected with the protective plate (10); the adjustable pipeline supporting hoop structures (11) are four in number and respectively comprise an anti-injury sheet (111), a pipeline hoop (112), an adjustable rod (113), a connecting pipe (114), a fastening bolt (115) and a transverse seat (116), and the anti-injury sheet (111) is glued to the inner wall of the pipeline hoop (112); the pipeline hoop (112) is in threaded connection with the lower end of the adjustable rod (113); the adjustable rod (113) is longitudinally inserted into the connecting pipe (114) and is fixedly connected and arranged through a fastening bolt (115); the connecting pipe (114) is connected to the outer end of the transverse seat (116) through bolts.
2. The pipe gimbal vibration isolator as claimed in claim 1, wherein there are two of said vibration damping branch structure (12) and each of them comprises a boot (121), a damping rod (122), a damping spring (123), a retainer ring (124), a support liner (125) and a stopper (126), said boot (121) being screwed on the upper end of the damping rod (122); the outer wall of the buffer rod (122) is sleeved with a buffer damping spring (123); the baffle ring (124) is sleeved in an annular groove formed in the outer wall of the lower end of the buffer rod (122); the buffer rod (122) is longitudinally inserted into the support liner tube (125); the left wall and the right wall of the upper part of the inner side of the supporting liner tube (125) are both connected with a stop block (126) through screws.
3. The universal vibration damping isolator for pipelines as claimed in claim 1, wherein the adjustable protecting and pulling rope structure (13) comprises a blocking cap (131), a protecting and pulling rope body (132), a connecting pipe (133), an adjusting bolt (134), a draw hook (135) and a draw ring (136), wherein the blocking cap (131) is screwed on the upper end of the protecting and pulling rope body (132); one end of the protective pull rope body (132) is inserted into the connecting pipe (133) and is fixedly connected with the connecting pipe through an adjusting bolt (134), and the other end of the protective pull rope body is tied with a draw hook (135); the draw hook (135) is hung inside the draw ring (136).
4. The pipe universal vibration damping and isolating device as claimed in claim 1, wherein the injury preventing sheet (111) is a rubber sheet, and the pipe hoop (112) is a semi-circular aluminum alloy hoop.
5. The pipe universal vibration isolator according to claim 1, wherein the cross seats (116) are bolted on the upper and lower left sides of the universal vibration isolator (1) and the upper and lower right sides of the universal vibration isolator (1).
6. The pipe universal vibration damping and isolating device as claimed in claim 1, wherein the pipe hoop (112) is hooped on the upper and lower parts of the outer side of the pipe body (3) through the injury prevention sheets (111).
7. The pipe universal vibration damping isolator as claimed in claim 2, wherein the protective sleeve (121) is a rubber sleeve and is sleeved outside the pipe body (3), the damping rod (122) is an aluminum alloy rod, and the damping spring (123) is a cylindrical stainless steel spring and is located between the protective sleeve (121) and the support liner (125).
8. The vibration isolator as claimed in claim 2, wherein the lower longitudinal ends of the support bushings (125) are screwed to the middle portions of the left and right sides of the upper portion of the base (5).
9. The vibration isolator of claim 3 wherein the pull ring (136) is bolted to the upper portion of the boot (121).
10. The use method of the pipe universal vibration damping and isolating device according to claim 1, wherein the fastening bolts are loosened, the moving position of the adjustable rod inside the connecting pipe is adjusted, after the position is determined, the fastening bolts are locked, the pipe body can be clasped by the pipe hoop through the anti-injury sheet, and finally the fastening bolts are locked, so that the support stability is ensured, if the pipe body vibrates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110369912.6A CN112833272A (en) | 2021-04-07 | 2021-04-07 | Pipeline universal vibration reduction and isolation device and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110369912.6A CN112833272A (en) | 2021-04-07 | 2021-04-07 | Pipeline universal vibration reduction and isolation device and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112833272A true CN112833272A (en) | 2021-05-25 |
Family
ID=75930684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110369912.6A Withdrawn CN112833272A (en) | 2021-04-07 | 2021-04-07 | Pipeline universal vibration reduction and isolation device and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112833272A (en) |
-
2021
- 2021-04-07 CN CN202110369912.6A patent/CN112833272A/en not_active Withdrawn
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20220215 Address after: 710000 room 8002-1, Puhui Zhongjin International Center, No. 132, Wenjing Road, economic and Technological Development Zone, Xi'an, Shaanxi Province Applicant after: Shaanxi Lite Pipeline Technology Co.,Ltd. Address before: 450041 no.1417, unit 1, 14th floor, building 33, No.55, Zhongxin Road, Shangjie District, Zhengzhou City, Henan Province Applicant before: Henan Zhihui Technology Co.,Ltd. |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210525 |
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| WW01 | Invention patent application withdrawn after publication |