CN111140586A - Anti-seismic anti-falling self-locking thread pair - Google Patents
Anti-seismic anti-falling self-locking thread pair Download PDFInfo
- Publication number
- CN111140586A CN111140586A CN201911426677.0A CN201911426677A CN111140586A CN 111140586 A CN111140586 A CN 111140586A CN 201911426677 A CN201911426677 A CN 201911426677A CN 111140586 A CN111140586 A CN 111140586A
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- retainer ring
- flange nut
- movable column
- nut
- fixed block
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- 230000002441 reversible effect Effects 0.000 claims abstract description 18
- 230000006835 compression Effects 0.000 claims abstract description 12
- 238000007906 compression Methods 0.000 claims abstract description 12
- 230000009471 action Effects 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Classifications
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/04—Locking of screws, bolts or nuts in which the locking takes place after screwing down with a member penetrating the screw-threaded surface of at least one part, e.g. a pin, a wedge, cotter-pin, screw
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/282—Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/32—Locking by means of a pawl or pawl-like tongue
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
The invention discloses an anti-seismic anti-drop self-locking thread pair, which comprises: 1. the device comprises a screw rod 2, a machine body 3, a connecting plate 4, a retainer ring 5, a forward ratchet 6, a flange nut 7, an external thread 8, a welding point 9, a rectangular groove 10, a reverse ratchet 11, a compression spring 12, a movable column 12-a and a fixed block. According to the invention, the movable column (12) or the fixed block (12-a) of the retainer ring (4) is clamped in the rectangular groove (9), cannot rotate radially and only can move axially, the forward ratchet (5) of the retainer ring (4) is tightly meshed with the reverse ratchet (10) of the flange nut (6), and the flange nut (6) can only rotate towards one direction and cannot be turned backwards, so that the flange nut (6) is always in a compression state on a connecting piece, and the flange nut has impact resistance and vibration resistance and is always in a tight connection state under the action of variable load.
Description
Technical Field
The invention relates to a thread, in particular to an anti-seismic anti-falling self-locking thread pair.
Background
In the prior art, in order to solve the self-loosening phenomenon that the threaded fastener is connected and probably appears when being impacted, vibrated or variable load and temperature variation are big, three kinds of theory of operation's locking anticreep mode has been adopted: the friction force is utilized to prevent looseness; locking and loosening prevention are directly realized by using mechanical elements; the movement relationship of the thread pair is damaged to prevent looseness. The common anti-loose method comprises a butt nut, a spring washer and a self-locking nut, wherein the butt nut is double-nut anti-loose, two nuts are used on a screw, and the thread clearance between the nuts and the screw is eliminated by means of the pretightening force between the two nuts, so that the friction force between the nuts and the screw is increased, and the aim of preventing loose to a certain extent is fulfilled. After the two nuts are screwed up in opposite directions, the screwing threads are always under the action of additional pressure and friction force. When the working load changes, the friction force still exists, and in the method, when the vibration is severe or the service life is long, the two nuts can be loosened, so that the disappearance of the pretightening force cannot play a role in preventing loosening, and the problem of nut loosening under the long-term vibration working condition cannot be solved; moreover, the nut cannot be used in occasions where the nut cannot be used; the use of two further nuts also results in increased costs.
The spring washer is used for pressing the screwing threads tightly by elastic counter force generated by flattening the cushion ring. Meanwhile, the tip of the bevel opening of the washer is propped against the bearing surfaces of the nut and the connected piece, so that the anti-loosening effect is achieved. The structure is simple, the looseness prevention is convenient, but the looseness prevention effect is poor due to the uneven elasticity of the gasket under the working conditions of impact and vibration, and the gasket cannot be used in the structure using the gasket and is generally used for the connection which is not important.
The self-locking nut is made into a non-circular closing-in or a radial closing-in after slotting on one end surface of the nut. When the nut is screwed down, the closing-in is expanded, and the screwing threads are tightly pressed by using the elasticity of the closing-in. Simple structure, looseness prevention is reliable, and can be assembled and disassembled for many times without reducing the looseness prevention performance. Suitable for more important couplings but not for structures using nuts.
The mechanical anti-loosening device mainly comprises a cotter pin and a groove nut, a stop washer and a series steel wire. The cotter pin and the groove nut are anti-loose, and the cotter pin penetrates into the small hole at the tail part of the bolt and the groove of the nut after the groove nut is screwed down. And the tail part of the cotter pin is broken off and is tightly attached to the side surface of the nut. The common nut can be used for replacing the groove nut, but the hole drilling is carried out after the nut is screwed down. It is suitable for connection in speed-regulating machinery with large impact and vibration. The stop washer is formed by respectively bending and tightly attaching a single-lug or double-lug stop washer to the side surfaces of the nut and the connected part, namely the nut can be locked after being screwed down. If the two bolts need to be locked in a duplex way, a duplex stop washer can be adopted to mutually brake the two nuts. Simple structure, convenient use and reliable looseness prevention.
The anti-loose of the series steel wire is to use a low carbon steel wire to penetrate into the holes at the screw heads, and to connect the screws in series to brake the screws mutually, and the penetrating direction of the steel wire must be noticed when in use. The locking device is suitable for connection of screw groups, is reliable in locking and is inconvenient to assemble and disassemble.
In summary, the conventional threaded fasteners are all realized by axial pretightening force generated during screwing. This gradual reduction in pretension can lead to loosening during severe vibrations. The loosening form of the bolt comprises three forms of transverse rotation, transverse translation, axial strain and the like, and the loosening forms can cause the self-loosening phenomenon of displacement between a screw or a nut and a bearing surface. The anti-loosening technology has been studied in large quantities at home and abroad, and various methods are adopted, for example: nylon self-locking nuts, metal self-locking nuts, spring washers, inner and outer spring washers, anaerobic glue, and the like. The anti-seismic anti-loosening mode adopted by the fastener in the prior art has respective advantages and respective application occasions, and simultaneously has the defects of different operating environments. Especially, in a complex vibration environment, a common screw used for adjustment and tuning in the communication (communication) and electronic industries is easy to loosen due to vibration and temperature change during transportation and work, so that the screw deviates from a working position, and an electric signal drifts, so that equipment cannot normally work or even is damaged.
The threaded connection has the advantages of simple structure, convenient assembly and disassembly and wide application. The defects are that the device is easy to lose efficacy and needs to be pre-tightened and anti-loose on occasions with larger stress and larger temperature difference. This drawback has always plagued the development and use of thread pairs. Furthermore, the surface of the connection piece must have a certain strength and hardness for the threaded connection, otherwise failure to achieve the required preload force can cause failure of the threads, which limits the use of the threaded connection. The effectiveness of a threaded workpiece depends on the accuracy of the thread making of the workpiece, the fit of the thread pair, sufficient pretension and the requirements on the surface quality and strength of the connection. The combination of the two methods makes the threaded connection easy to loosen and not become a hidden danger of equipment all the time. A large amount of manual periodic inspection and pre-tightening are required.
Disclosure of Invention
In order to solve the problem that the thread pair is easy to generate insufficient pretightening force or lose efficacy and other adverse conditions in the prior art, the invention discloses an anti-seismic anti-falling self-locking thread pair which is applied to all mechanical combinations for installing, locking, sealing, connecting, positioning and running the thread pair.
The technical scheme of the invention is as follows: the invention relates to an anti-seismic anti-drop self-locking thread pair, which comprises: 1. the device comprises a screw rod 2, a machine body 3, a connecting plate 4, a retainer ring 5, a forward ratchet 6, a flange nut 7, an external thread 8, a welding point 9, a rectangular groove 10, a reverse ratchet 11, a compression spring 12, a movable column 12-a and a fixed block. A rectangular groove (9) is reserved on any axial side of an external thread (7) of the screw (1), the width and the depth of the rectangular groove are equal, the length of the rectangular groove is larger than that of the external thread (7), the machine body (2) and the connecting plate (3) are parts which are required to be connected with a common screw and a nut, the rectangular groove is not an essential part of the invention, a plurality of forward ratchets (5) are uniformly distributed on the upper end surface of the retainer ring (4), the forward ratchets (5) have elastic plasticity and are in a bouncing state under a static condition, the forward ratchets are compressed and bent under the action of external force and can automatically bounce when the external force is lost, a reducing through hole is reserved at the radial position of the retainer ring (4), a movable column (12) is arranged on the inner side of the reducing through hole, a compression spring (11) is arranged outside the movable column (12), the outer end of the compression spring (, the movable column (12) is in a diameter-variable column shape, the outer end of the movable column is in a small diameter, and the end face of the movable column is a slope surface of 10-30 degrees, so that a special tool can be conveniently inserted to jack up the movable column (12) for disassembling the flange nut (6). The function of the fixed block (12-a) of the retainer ring (4) is the same as that of the movable column (12), the retainer ring (4) with the movable column (12) is matched with a special tool, the flange nut (6) can be detached, the screw rod (1) and the flange nut (6) can be reused, the retainer ring (4) with the fixed block (12-a) is provided, the flange nut (6) cannot be detached, and the screw rod (1) and the flange nut (6) cannot be separated permanently. One end face of the flange nut (6) is of a normal n-edge type of a common nut, the other end face of the flange nut is circular, reverse ratchets (10) are uniformly distributed on the circular end face, the reverse ratchets (10) are connected one by one, and the height and the shape of the reverse ratchets are completely the same as those of the forward ratchets (5).
Preferably, the check ring (4) with the movable column (12) and the check ring (4) with the fixed block (12-a) can be replaced and used according to occasions, under the condition that the thread pair is tightly connected, the check ring (4) with the movable column (12) can be detached and reused under the cooperation of a special tool, the check ring (4) with the fixed block (12-a) cannot be detached, the thread pair cannot be separated permanently, and the check ring cannot be continuously used only through destructive forced detachment.
Preferably, the movable column (12) or the fixed block (12-a) of the retainer ring (4) is clamped in the rectangular groove (9) and cannot rotate radially but only move axially, the forward ratchet (5) of the retainer ring (4) is tightly meshed with the reverse ratchet (10) of the flange nut (6), and the flange nut (6) can only rotate towards one direction but cannot rotate backwards, so that the flange nut (6) is always in a compression state on the connecting piece, and has shock resistance and vibration resistance, and under the action of variable load, the thread pair is always in a tight connection state.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the movable column (12) or the fixed block (12-a) of the retainer ring (4) is clamped in the rectangular groove (9), cannot rotate radially and only can move axially, the forward ratchet (5) of the retainer ring (4) is tightly meshed with the reverse ratchet (10) of the flange nut (6), and the flange nut (6) can only rotate towards one direction and cannot be turned backwards, so that the flange nut (6) is always in a compression state on a connecting piece, and the flange nut has impact resistance and vibration resistance and is always in a tight connection state under the action of variable load.
2. The invention adds the movable column (12) or the fixed block (12-a) which is clamped in the rectangular groove (9) and can not rotate radially, but can move axially, thereby solving the accidents caused by loosening, falling off and the like of common threaded connection in severe environments such as vibration, impact and the like, and eliminating the dependence on the pretightening force of threaded connection.
Drawings
FIG. 1 is a side view of the overall structure of the present invention
FIG. 2 is a side view of the retainer ring with the movable post according to the present invention
FIG. 3 is a top view of the retainer ring with movable post according to the present invention
FIG. 4 is a side view of the retainer ring with the retaining block of the present invention
FIG. 5 is a top view of the retainer ring with retaining block according to the present invention
FIG. 6 is a side view of the screw with rectangular groove of the present invention
FIG. 7 is a top view of a flange nut of the present invention
FIG. 8 is a side view of the flange nut of the present invention
FIG. 9 is a bottom view of the flange nut of the present invention
Fig. 10 shows a forward ratchet and a reverse ratchet according to the present invention.
Detailed Description
The inventive method is further explained below with reference to the drawing.
The movable column (12) and the fixed block (12-a) of the retainer ring (4) are clamped in the rectangular groove (9) and cannot radially rotate but only axially move, the forward ratchet (5) of the retainer ring (4) is tightly meshed with the reverse ratchet (10) of the flange nut (6), and the flange nut (6) can only rotate towards one direction but cannot be turned backwards, so that the flange nut (6) is always in a compression state on a connecting piece, and has shock resistance and vibration resistance, and a thread pair is always in a tight connection state under the action of variable load. The invention can make the thread pair self-lock without pretightening force and has no displacement. The requirement of threaded connection on pretightening force is reduced, the application range of the threaded connection on soft metal and low-strength objects is enlarged, the application field of the threaded connection is enlarged, the relative vibration and displacement of the thread pair caused by repeated stress of the thread pair are eliminated, and the stability and the reliability are improved.
Example (b):
the thread pair of the embodiment can complete various functions of the existing threads in normal work, and the manufacturing size, precision, tolerance, strength grade and the prior art standard requirement of the screw rod, the external threads and the flange nut of the thread pair are equal. The specific use method comprises the following steps: the connecting plate (3) is fixed on the machine body (2) in a sequence that firstly a screw rod (1) penetrates through a reserved round hole of the machine body (2), secondly the connecting plate (3) penetrates through the screw rod (1), then a check ring (4) penetrates through the screw rod (1), finally a flange nut (6) rotates clockwise to the screw rod (1) from the outer end of an external thread (7), after the flange nut (6) is combined with the check ring (4), the flange nut (6) is clamped by a spanner, the clockwise rotation continues, at the moment, a forward ratchet (5) of the check ring (4) is compressed and bent under the pressure of a reverse ratchet (10) of the flange nut (6), until the flange nut (6) cannot rotate, at the moment, the forward ratchet (5) of the check ring (4) is completely meshed with the reverse ratchet (10) of the flange nut (6), and the counterclockwise rotation is not completed, namely, the connection engineering of the screw rod (1) and the flange nut (6) is completed, the machine body (2) is firmly fixed with the connecting plate (3). If the retaining ring (4) is provided with the fixing block (12-a), the flange nut (6) and the retaining ring (4) cannot be separated permanently at the moment, and only destructive forced removal is carried out. If the retainer ring (4) is provided with the movable column (12), the flange nut (6) is to be disassembled, a special tool is inserted into the rectangular groove (9) to jack up the movable column (12), the movable column (12) is separated from the rectangular groove (9), the flange nut (6) is rotated anticlockwise by a spanner, and the retainer ring (4) is forced to rotate due to the fact that the reverse ratchet (10) of the flange nut (6) is completely meshed with the forward ratchet (5) of the retainer ring (4), and the flange nut (6) is completely disassembled.
Claims (3)
1. An anti-seismic anti-drop self-locking thread pair, comprising: 1. the device comprises a screw rod 2, a machine body 3, a connecting plate 4, a retainer ring 5, a forward ratchet 6, a flange nut 7, an external thread 8, a welding point 9, a rectangular groove 10, a reverse ratchet 11, a compression spring 12, a movable column 12-a and a fixed block. The method is characterized in that: a rectangular groove (9) is reserved on any axial side of an external thread (7) of the screw (1), the width and the depth of the rectangular groove are equal, the length of the rectangular groove is larger than that of the external thread (7), the machine body (2) and the connecting plate (3) are parts which are required to be connected with a common screw and a nut, the rectangular groove is not an essential part of the invention, a plurality of forward ratchets (5) are uniformly distributed on the upper end surface of the retainer ring (4), the forward ratchets (5) have elastic plasticity and are in a bouncing state under a static condition, the forward ratchets are compressed and bent under the action of external force and can automatically bounce when the external force is lost, a reducing through hole is reserved at the radial position of the retainer ring (4), a movable column (12) is arranged on the inner side of the reducing through hole, a compression spring (11) is arranged outside the movable column (12), the outer end of the compression spring (, the movable column (12) is in a diameter-variable column shape, the outer end of the movable column is in a small diameter, and the end face of the movable column is a slope surface of 10-30 degrees, so that a special tool can be conveniently inserted to jack up the movable column (12) for disassembling the flange nut (6). The function of the fixed block (12-a) of the retainer ring (4) is the same as that of the movable column (12), the retainer ring (4) with the movable column (12) is matched with a special tool, the flange nut (6) can be detached, the screw rod (1) and the flange nut (6) can be reused, the retainer ring (4) with the fixed block (12-a) is provided, the flange nut (6) cannot be detached, and the screw rod (1) and the flange nut (6) cannot be separated permanently. One end face of the flange nut (6) is of a normal n-edge type of a common nut, the other end face of the flange nut is circular, reverse ratchets (10) are uniformly distributed on the circular end face, the reverse ratchets (10) are connected one by one, and the height and the shape of the reverse ratchets are completely the same as those of the forward ratchets (5).
2. An anti-seismic anti-drop self-locking thread pair according to claim 1, characterized in that a movable column (12) or a fixed block (12-a) of the retainer ring (4) is clamped in a rectangular groove (9) and cannot radially rotate but can only axially move, a forward ratchet (5) of the retainer ring (4) is tightly engaged with a reverse ratchet (10) of the flange nut (6), and the flange nut (6) can only rotate in one direction and cannot be turned upside down, so that the flange nut (6) is always in a compression state on a connecting piece.
3. An anti-seismic anti-drop self-locking thread pair according to claim 1, characterized in that the retainer ring (4) with the movable column (12) and the retainer ring (4) with the fixed block (12-a) can be replaced and used according to the occasion, under the condition that the thread pair is tightly connected, the retainer ring (4) with the movable column (12) can be detached and reused under the cooperation of a special tool, the retainer ring (4) with the fixed block (12-a) can not be detached, and the thread pair can not be separated permanently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911426677.0A CN111140586A (en) | 2019-12-23 | 2019-12-23 | Anti-seismic anti-falling self-locking thread pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911426677.0A CN111140586A (en) | 2019-12-23 | 2019-12-23 | Anti-seismic anti-falling self-locking thread pair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111140586A true CN111140586A (en) | 2020-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911426677.0A Pending CN111140586A (en) | 2019-12-23 | 2019-12-23 | Anti-seismic anti-falling self-locking thread pair |
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| Country | Link |
|---|---|
| CN (1) | CN111140586A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963411A (en) * | 2021-02-25 | 2021-06-15 | 江苏荣光五金科技有限公司 | Stainless steel flange with built-in telescopic self-locking mechanism |
-
2019
- 2019-12-23 CN CN201911426677.0A patent/CN111140586A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963411A (en) * | 2021-02-25 | 2021-06-15 | 江苏荣光五金科技有限公司 | Stainless steel flange with built-in telescopic self-locking mechanism |
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