CN105742773A - Cavity filter and self-locking tuning assembly thereof - Google Patents
Cavity filter and self-locking tuning assembly thereof Download PDFInfo
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- CN105742773A CN105742773A CN201610109821.8A CN201610109821A CN105742773A CN 105742773 A CN105742773 A CN 105742773A CN 201610109821 A CN201610109821 A CN 201610109821A CN 105742773 A CN105742773 A CN 105742773A
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- self
- locking nut
- locking
- tuning
- presses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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Abstract
The invention discloses a self-locking tuning assembly for a cavity filter. The self-locking tuning assembly is used for being arranged on a cover plate of the cavity filter, is tightly connected with the cover plate and comprises a tuning screw rod and a press rivet self-locking nut, wherein the press rivet self-locking nut can be tightly fixed on the cover plate and is provided with a threaded hole, the threaded hole is adaptive to screw teeth of the tuning screw rod, a stamping groove is stamped in the outer side wall of the press rivet self-locking nut, a thread, corresponding to the position of the stamping groove, on the threaded hole in the inner side of the press rivet self-locking nut, radially protrudes to form an opening part by the stamping groove, and the opening part is used for squeezing the screw teeth of the tuning screw rod and increasing a rotation torque. The invention also discloses a cavity filter with the above self-locking tuning assembly. With the implementation of the cavity filter and the self-locking tuning assembly, provided by the invention, the process difficulty can be reduced, the production cost is reduced, secondary operation of the tuning screw rod is eliminated, the adjustment range is expanded, and the debugging efficiency of the filter is improved.
Description
Technical field
The present invention relates to domain of communication equipment, particularly relate to a kind of cavity body filter and self-locking tuning block thereof.
Background technology
In prior art, the tuning screw structure that in communication equipment cavity body filter, manual debugging uses, it usually needs undertaken locked by double nut.This kind of structure is due to the existence of thread pitch so that the pull-up that is susceptible in locking process screw rod, and debugging result changes and affects the adverse consequences of adjustment accuracy.Its mode made up relies primarily on that nut carries out after debugging completes a glue is locking by prior art, but this kind of mode cost of labor is higher.
Additionally, industry also has a small amount of structure applying Self-locking screw at present, for instance: grooving and two sections of screw threads staggered of turning on screw rod, when screwing in common self-clinching nut and using, two sections of screw threads that stagger pull open, and grooving position produces axial tensile force, thus increasing frictional force between thread, reach self-locking purpose；This kind of self-locking structure there is the problem that due to screw thread and to rotate grooving required precision high processing cost high, and individual precision difference easily causes that coupling mechanism force aspect is unstable and failure risk is big simultaneously；Nut thread all can not be rotated so that tuning range is limited, it is necessary to often changing different length screw rod, debugging efficiency is low additionally, due to two sections of screw threads.
Therefore, it is necessary to design the tuning screw that a kind of cost is low, it is convenient to assemble, can improve efficiency of assembling.
Summary of the invention
The technical problem to be solved is in that, it is provided that a kind of cavity body filter and self-locking tuning block thereof, reduces technology difficulty, reduces production cost, exempts the secondary locking operation of tuning screw；Increase range of accommodation, improve the efficiency of wave filter debugging.
In order to solve above-mentioned technical problem, The embodiment provides a kind of self-locking tuning block for cavity body filter, in order to be arranged on the cover plate that cavity body filter has and to be fastenedly connected with it, it is characterised in that including: tuning screw and the self-locking nut that presses on the cover board can be fastened；The self-locking nut that presses is provided with the screwed hole that the thread having with tuning screw is suitable, the press lateral wall of self-locking nut is stamped with stamped groove, stamped groove makes the radial projection in the screw thread threadingly hole on the screwed hole inside the self-locking nut that presses corresponding with its position form closing in portion, in order to extrude the thread of tuning screw and to increase turning moment.
Wherein, the self-locking nut that presses has elasticity, and when the thread of tuning screw screws in the screwed hole of the self-locking nut that presses, the radial direction of the screw thread extruding tuning screw thread in closing in portion is to carry out self-locking.
Wherein, the self-locking nut that presses is frustum, with by hydraulic cylinder determine stroke operation on the lateral wall of self-locking nut that presses once property stamp out Multi-step forming groove.
Wherein, the self-locking nut that presses includes just press self-locking nut and/or back-pressure riveting self-locking nut, just the pressing bottom of self-locking nut and/or back-pressure riveting self-locking nut is provided with bulge loop and/or groove, in order to enable malleation riveting self-locking nut and/or back-pressure riveting self-locking nut to be locked on the cover plate of cavity body filter.
Wherein, just pressing self-locking nut and back-pressure riveting self-locking nut is being connected as a single entity.
For solving above-mentioned technical problem, the present invention provides another kind of technical scheme, a kind of cavity body filter, including cavity, it is covered in the cover plate on cavity and may pass through cover plate the self-locking tuning block extending in cavity, it is characterized in that, self-locking tuning block includes: tuning screw and can fasten just press self-locking nut and/or back-pressure riveting self-locking nut on the cover board, just pressing self-locking nut and/or back-pressure riveting self-locking nut is being provided with the screwed hole that the thread having with tuning screw is suitable, just the pressing lateral wall of self-locking nut and/or back-pressure riveting self-locking nut is stamped with stamped groove, stamped groove makes the radial projection in the screw thread threadingly hole on the screwed hole inside just press self-locking nut and/or the back-pressure riveting self-locking nut corresponding with its position form closing in portion, in order to extrude the thread of tuning screw and to increase turning moment.
Wherein, just pressing self-locking nut and/or back-pressure riveting self-locking nut respectively in frustum, with by hydraulic cylinder determine stroke operation on the lateral wall of self-locking nut that presses once property stamp out Multi-step forming groove.
Wherein, just pressing self-locking nut and/or back-pressure riveting self-locking nut has elasticity, when the thread of tuning screw screws in the screwed hole of just pressing self-locking nut and/or back-pressure riveting self-locking nut, the radial direction of the screw thread extruding tuning screw thread in closing in portion is to carry out self-locking.
Wherein, tuning screw includes shaven head tuning screw and round end tuning screw, is provided with cutter groove in one end of tuning screw.
Cavity body filter provided by the present invention and self-locking tuning block thereof, have the advantages that
The first, owing to the lateral wall of the self-locking nut that presses is stamped with stamped groove, stamped groove makes the radial projection in the screw thread threadingly hole on the screwed hole inside the self-locking nut that presses corresponding with its position form closing in portion, when the thread of tuning screw screws in the screwed hole of the self-locking nut that presses, the screw thread in closing in portion can extrude the radial direction of tuning screw thread to carry out self-locking, it is possible to exempts secondary locking operation.Additionally it is possible to increase range of accommodation, improve the debugging efficiency of cavity body filter.
The second, the self-locking nut that presses is frustum, determine stroke operation by a hydraulic cylinder and just can stamp out Multi-step forming groove on the lateral wall of self-locking nut that presses, and the size in screw thread closing in portion can be controlled by regulating hydraulic cylinder crush stroke, and then control locking torque；More traditional self-locking screw rod, it is easier to control accuracy is more suitable for producing in enormous quantities, thus reducing cost.
3rd, just pressing self-locking nut and structure that back-pressure riveting self-locking nut is connected as a single entity so that at least two closing in portion can be set simultaneously, increase stability and the self-locking effect of tuning screw further.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of embodiment of the present invention cavity body filter.
Fig. 2 is the partial structurtes schematic diagram that the tuning screw of embodiment of the present invention self-locking tuning block assembles mutually with the self-locking nut that just presses.
Fig. 3 is the plan structure schematic diagram of the self-locking nut that presses of embodiment of the present invention chamber self-locking tuning block.
Fig. 4 is the structural representation that the tuning screw of embodiment of the present invention self-locking tuning block assembles mutually with the self-locking nut that just presses.
Fig. 5 is the tuning screw sectional structure schematic diagram with the self-locking nut assembling that just presses of embodiment of the present invention cavity body filter.
Fig. 6 is the tuning screw sectional structure schematic diagram with the assembling of back-pressure riveting self-locking nut of embodiment of the present invention cavity body filter.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
In conjunction with referring to shown in Fig. 1-Fig. 6, for the embodiment one of cavity body filter of the present invention.
nullCavity body filter in the present embodiment，As shown in Figure 1，Including cavity (chamber structure that zero component enclosing of cover plate 1 and other cavity body filter is formed)、It is covered in the cover plate 1 on cavity and may pass through cover plate 1 the self-locking tuning block extending in cavity，Self-locking tuning block includes: tuning screw 21 and just press self-locking nut 22 and the back-pressure riveting self-locking nut 23 that can be fastened on cover plate 1，Just pressing self-locking nut 22 and back-pressure riveting self-locking nut 23 is being provided with the screwed hole T that the thread 211 having with tuning screw 21 is suitable，Just the pressing lateral wall of self-locking nut 22 and back-pressure riveting self-locking nut 23 is stamped with stamped groove 221，Stamped groove 221 makes the radial projection of the screw thread T1 threadingly hole T on the screwed hole T inside just press self-locking nut 22 and the back-pressure riveting self-locking nut 23 corresponding with stamped groove 221 position form closing in portion (being made up of a plurality of screw thread T1)，In order to extrude the thread 211 of tuning screw 21 and to increase turning moment.
When being embodied as, tuning screw 21 includes shaven head tuning screw and round end tuning screw, it is also possible to is the screw rod of other Common Shape, is provided with to connect the thread 211 of the self-locking nut that presses in the periphery of tuning screw 21.Meanwhile, one end of tuning screw 21 is provided with to screw the cutter groove 212 of tuning screw 21, by using the instrument suitable with cutter groove 212 to screw, just can implement tuning screw 21 and the installation of the self-locking nut that presses and dismounting.
The self-locking nut that presses includes just press self-locking nut 22 and back-pressure riveting self-locking nut 23.In the present embodiment, as in figure 2 it is shown, the self-locking nut 22 that just pressing is roughly the same with the shape of back-pressure riveting self-locking nut 23, and it is connected as a single entity.Can only arranging according to the user demand that cavity body filter is actual in other embodiment and just pressing self-locking nut 22 or only arranging back-pressure riveting self-locking nut 23, assembling and specifically used mode are identical with the embodiment being simultaneously provided with positive and negative two self-locking nuts.
Specifically, the self-locking nut 22 that just pressing, in frustum, is formed through screwed hole T by punching press tapping production technology in the middle part of it, and the diameter dimension of this screwed hole T is suitable with the outside dimension of the thread 211 of tuning screw 21, as shown in Figure 3.
Just the pressing bottom of self-locking nut 22 is provided with bulge loop 222 and groove 223, and the effect of bulge loop 222 and groove 223 is that the self-locking nut 22 that makes just to press can be locked on the cover plate 1 of cavity body filter.In other embodiment, it is possible to bulge loop 222 be only set or groove 223 structure is only set realizes being fastenedly connected, it is also possible to using, for instance: fix, the common structure such as gluing and interference engagement realizes the self-locking nut 22 connection with cover plate 1 that just pressing.
Further, just the pressing lateral wall of self-locking nut 22 is stamped with a plurality of stamped groove 221, stamped groove 221 makes the radial direction of the screw thread T1 threadingly hole T on the screwed hole T inside the self-locking nut 22 that just presses corresponding with stamped groove 221 position, the namely direction projection of the central axis O of screwed hole T, thus forming closing in portion, the effect in closing in portion is to extrude the thread 211 of tuning screw 21 when the thread 211 of tuning screw 21 screws in the screwed hole T of the self-locking nut 22 that just presses and increase turning moment.
In the present embodiment, a plurality of stamped groove 221 is equidistantly uniformly arranged, its be by hydraulic cylinder determine stroke operation on the lateral wall of the self-locking nut that just presses once property punching press and go out.Also therefore, the self-locking nut 22 that just presses is set to frustum, it is possible to only by hydraulic cylinder determine stroke operation just can on the lateral wall of self-locking nut 22 that just presses once property stamp out Multi-step forming groove 221, thus the closing in portion that formation is made up of a plurality of screw thread T1.This structure is compared to tradition self-locking screw rod, it is easier to control accuracy and production in enormous quantities, and then can reduce cost.
Further, the present embodiment also includes a back-pressure riveting self-locking nut 23, the planform of back-pressure riveting self-locking nut 23 is roughly the same with the shape and structure of the above-mentioned self-locking nut 22 that just pressing, it is connected as a single entity with the self-locking nut 22 that just presses, two self-locking nuts 22,23 that press have the screwed hole T that central shaft is O, and both position and be clamped on by bulge loop 222 and groove 223 on cover plate 1.The lateral wall of back-pressure riveting self-locking nut 23 is stamped with a plurality of stamped groove, stamped groove makes the radial direction of the screw thread T1 threadingly hole T on the screwed hole T inside the back-pressure riveting self-locking nut 23 corresponding with stamped groove position, the namely direction projection of the central axis O of screwed hole T, thus forming closing in portion.When being embodied as, it is possible to determine stroke operation by twice hydraulic cylinder and carry out disposable punching press on the lateral wall of the positive and negative self-locking nut 22,23 that presses respectively, form Multi-step forming groove 221 respectively.
In other embodiment, cavity body filter can only assemble the self-locking nut 22 that just presses, and the self-locking nut 22 that just presses owing to assembling is positioned at the outside of cover plate 1, it is possible to plays the advantage that power is strong.Meanwhile, cavity body filter can also only assemble back-pressure riveting self-locking nut 23, and it can make the surface of cavity body filter without projection, thus reducing the volume of cavity body filter.
Further, the present embodiment also discloses a kind of self-locking tuning block comprising above-mentioned tuning screw 21 and can being fastened on cover plate 1 to press self-locking nut, and self-locking tuning block can be fixed on the cover plate 1 that cavity body filter has and be fastenedly connected with it.The self-locking nut that presses includes above-mentioned self-locking nut 22 and/or the above-mentioned back-pressure riveting self-locking nut 23 of just pressing, its concrete structure and assembling mode ibid, repeats no more.
nullCavity body filter in the present embodiment and self-locking tuning block thereof are in the specific implementation，In conjunction with referring to Fig. 4-Fig. 6，Noting presses from function towards tuning face avoids the generations such as burr affects electrical specifications，The self-clinching nut of corresponding different structure，Just press self-locking nut 22 and/or above-mentioned back-pressure riveting self-locking nut 23 are pressed to by the location structure of bulge loop 222 and groove 223 on the cover plate 1 of cavity body filter，Tuning screw 21 is screwed in the screwed hole T of just press self-locking nut 22 and/or above-mentioned back-pressure riveting self-locking nut 23，Owing to the stamped groove 221 of just press self-locking nut 22 and/or above-mentioned back-pressure riveting self-locking nut 23 makes the radial direction of the screw thread T1 threadingly hole T on the screwed hole T inside just press self-locking nut 22 and/or the above-mentioned back-pressure riveting self-locking nut 23 corresponding with stamped groove 221 position,The namely direction projection of the central axis O of screwed hole T，Thus forming closing in portion；And owing to just pressing self-locking nut 22 and/or back-pressure riveting self-locking nut 23 has certain elasticity, closing in portion can extrude the thread 211 of tuning screw 21 and increase turning moment, thus realizing self-locking；Additionally, closing in portion can make tuning screw 21 carry out tight and good contacting with self-locking tuning block, be conducive to improving the performance indications of cavity body filter, compared to traditional self-locking screw rod, it is easier to control accuracy is more suitable for producing in enormous quantities.
The cavity body filter of the present invention and self-locking tuning block thereof, have the advantages that
The first, owing to the lateral wall of the self-locking nut that presses is stamped with stamped groove, stamped groove makes the radial projection in the screw thread threadingly hole on the screwed hole inside the self-locking nut that presses corresponding with its position form closing in portion, when the thread of tuning screw screws in the screwed hole of the self-locking nut that presses, the screw thread in closing in portion can extrude the radial direction of tuning screw thread to carry out self-locking, it is possible to exempts secondary locking operation.Additionally it is possible to increase range of accommodation, improve the debugging efficiency of cavity body filter.
The second, the self-locking nut that presses is frustum, determine stroke operation by a hydraulic cylinder and just can stamp out Multi-step forming groove on the lateral wall of self-locking nut that presses, and the size in screw thread closing in portion can be controlled by regulating hydraulic cylinder crush stroke, and then control locking torque；More traditional self-locking screw rod, it is easier to control accuracy is more suitable for producing in enormous quantities, thus reducing cost.
3rd, just pressing self-locking nut and structure that back-pressure riveting self-locking nut is connected as a single entity so that at least two closing in portion can be set simultaneously, increase stability and the self-locking effect of tuning screw further.
Claims (9)
1. for a self-locking tuning block for cavity body filter, in order to be arranged on the cover plate that cavity body filter has and to be fastenedly connected with it, it is characterised in that including: tuning screw and the self-locking nut that presses that can be fastened on described cover plate；
The described self-locking nut that presses is provided with the screwed hole suitable with the thread that described tuning screw has, the lateral wall of the described self-locking nut that presses is stamped with stamped groove, described stamped groove make corresponding with its position described in the described screw thread that presses on the described screwed hole inside self-locking nut form closing in portion along the radial projection of described screwed hole, in order to extrude the described thread of described tuning screw and to increase turning moment.
2. the self-locking tuning block for cavity body filter as claimed in claim 1, it is characterized in that, the described self-locking nut that presses has elasticity, time in the described screwed hole of the self-locking nut that presses described in the described thread of described tuning screw screws in, the described screw thread in described closing in portion extrudes the radial direction of described tuning screw thread to carry out self-locking.
3. the self-locking tuning block for cavity body filter as claimed in claim 1 or 2, it is characterised in that described in the self-locking nut that presses be frustum, with by hydraulic cylinder determine stroke operation on the lateral wall of the described self-locking nut that presses once property stamp out Multi-step forming groove.
4. the self-locking tuning block for cavity body filter as claimed in claim 3, it is characterized in that, the described self-locking nut that presses includes just press self-locking nut and/or back-pressure riveting self-locking nut, the described bottom just pressing self-locking nut and/or described back-pressure riveting self-locking nut is provided with bulge loop and/or groove, described is just pressing self-locking nut and/or described back-pressure riveting self-locking nut is locked on the cover plate of cavity body filter in order to enabling.
5. the self-locking tuning block for cavity body filter as claimed in claim 3, it is characterised in that described just pressing self-locking nut and described back-pressure riveting self-locking nut is connected as a single entity.
null6. a cavity body filter，Including cavity、It is covered in the cover plate on described cavity and may pass through described cover plate the self-locking tuning block extending in described cavity，It is characterized in that，Described self-locking tuning block includes: tuning screw and just press self-locking nut and/or the back-pressure riveting self-locking nut that can be fastened on described cover plate，Described just pressing self-locking nut and/or described back-pressure riveting self-locking nut is provided with the screwed hole suitable with the thread that described tuning screw has，The described lateral wall just pressing self-locking nut and/or described back-pressure riveting self-locking nut is stamped with stamped groove，Described stamped groove makes the described screw thread on the described screwed hole inside described just pressing self-locking nut and/or the described back-pressure riveting self-locking nut corresponding with its position along the radial projection formation closing in portion of described screwed hole，In order to extrude the described thread of described tuning screw and to increase turning moment.
7. cavity body filter as claimed in claim 6, it is characterized in that, described self-locking nut and/or the described back-pressure riveting self-locking nut of just pressing respectively in frustum, with by hydraulic cylinder determine stroke operation on the lateral wall of the described self-locking nut that presses once property stamp out Multi-step forming groove.
8. cavity body filter as claimed in claim 7, it is characterized in that, described just pressing self-locking nut and/or described back-pressure riveting self-locking nut has elasticity, when the described thread of described tuning screw screws in the described screwed hole of described just pressing self-locking nut and/or described back-pressure riveting self-locking nut, the described screw thread in described closing in portion extrudes the radial direction of described tuning screw thread to carry out self-locking.
9. cavity body filter as claimed in claim 8, it is characterised in that described tuning screw includes shaven head tuning screw and round end tuning screw, is provided with cutter groove in one end of described tuning screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610109821.8A CN105742773B (en) | 2016-02-29 | 2016-02-29 | A kind of cavity body filter and its self-locking tuning block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610109821.8A CN105742773B (en) | 2016-02-29 | 2016-02-29 | A kind of cavity body filter and its self-locking tuning block |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105742773A true CN105742773A (en) | 2016-07-06 |
| CN105742773B CN105742773B (en) | 2019-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610109821.8A Active CN105742773B (en) | 2016-02-29 | 2016-02-29 | A kind of cavity body filter and its self-locking tuning block |
Country Status (1)
| Country | Link |
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| CN (1) | CN105742773B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356595A (en) * | 2016-09-19 | 2017-01-25 | 深圳三星通信技术研究有限公司 | Cavity filter |
| CN109786908A (en) * | 2019-03-11 | 2019-05-21 | 深圳市安特无线设备有限公司 | Tune the filter of cover board and the application cover board |
| CN115377635A (en) * | 2022-09-06 | 2022-11-22 | 大富科技(安徽)股份有限公司 | Filter |
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| CN2408299Y (en) * | 2000-01-30 | 2000-11-29 | 杨志清 | Elastic anti-loose nut |
| CN202888366U (en) * | 2012-10-12 | 2013-04-17 | 深圳市大富科技股份有限公司 | Filter cover plate and filter |
| US20140186134A1 (en) * | 2013-01-03 | 2014-07-03 | Chen-Mao Lin | Self-Locking Nut Assembly |
| CN104454908A (en) * | 2014-11-04 | 2015-03-25 | 贵州航天精工制造有限公司 | Axial compression thread self-locking nut and closing-in method thereof |
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2016
- 2016-02-29 CN CN201610109821.8A patent/CN105742773B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2408299Y (en) * | 2000-01-30 | 2000-11-29 | 杨志清 | Elastic anti-loose nut |
| CN202888366U (en) * | 2012-10-12 | 2013-04-17 | 深圳市大富科技股份有限公司 | Filter cover plate and filter |
| US20140186134A1 (en) * | 2013-01-03 | 2014-07-03 | Chen-Mao Lin | Self-Locking Nut Assembly |
| CN104454908A (en) * | 2014-11-04 | 2015-03-25 | 贵州航天精工制造有限公司 | Axial compression thread self-locking nut and closing-in method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356595A (en) * | 2016-09-19 | 2017-01-25 | 深圳三星通信技术研究有限公司 | Cavity filter |
| CN106356595B (en) * | 2016-09-19 | 2019-07-30 | 深圳三星通信技术研究有限公司 | A kind of cavity body filter |
| CN109786908A (en) * | 2019-03-11 | 2019-05-21 | 深圳市安特无线设备有限公司 | Tune the filter of cover board and the application cover board |
| CN109786908B (en) * | 2019-03-11 | 2024-02-23 | 深圳市安特无线设备有限公司 | Tuning cover plate and filter using same |
| CN115377635A (en) * | 2022-09-06 | 2022-11-22 | 大富科技(安徽)股份有限公司 | Filter |
| CN115377635B (en) * | 2022-09-06 | 2024-03-19 | 大富科技(安徽)股份有限公司 | Filter |
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|---|---|
| CN105742773B (en) | 2019-07-30 |
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