Optical fiber connector convenient to disassemble and assemble

Abstract

The invention relates to the related technical field of optical fiber connectors, in particular to an optical fiber connector convenient to disassemble and assemble, which comprises a positioning seat, a butt joint seat and a fastening seat, and is characterized in that the positioning seat is used for positioning a first-stage optical fiber and a second-stage optical fiber and comprises a first seat body, a threaded seat, a second seat body, a first-stage positioning piece and a second-stage positioning piece; the first seat body, the threaded seat and the second seat body are integrally formed, and mounting holes are formed in the first seat body, the threaded seat and the second seat body in a penetrating manner; the positioning seat is formed by combining the first seat body, the threaded seat, the second seat body, the first-stage positioning piece and the second-stage positioning piece, and the first-stage stress surface, the threaded hole and the second-stage stress surface are arranged on the inner side wall of the fastening seat, so that acting force is applied to the first-stage positioning piece and the second-stage positioning piece through the first-stage stress surface and the second-stage stress surface; therefore, when the fastening seat is screwed and fastened, the primary optical fiber and the secondary optical fiber can be positioned and butted, so that the disassembly and assembly efficiency of the optical fibers is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to optical fiber connectors, and in particular to an optical fiber connector which is easy to assemble and disassemble. Background Art

[0002] Fiber optic connector is a device for detachable (movable) connection between optical fibers. It precisely connects the two end faces of the optical fiber so that the light energy output by the transmitting optical fiber can be coupled to the receiving optical fiber to the maximum extent. The existing Chinese patent document with announcement number CN218886235U discloses an optical fiber connector that is easy to disassemble and assemble, and the scheme includes an optical fiber connector mounting shell, a fixed shaft is fixedly assembled on the optical fiber connector mounting shell, a first motor is fixedly assembled on the fixed shaft, an assembly rod is fixedly assembled on the output end of the first motor, a connecting rod is fixedly assembled on one end of the assembly rod, an assembly block is fixedly assembled on the connecting rod, the assembly block is fixedly assembled on the optical fiber connector movable shell, the assembly block is fixedly assembled on one side outer surface of the optical fiber connector movable shell, a limiting groove is arranged on the optical fiber connector movable shell, the fixed shaft is located in the limiting groove and the fixed shaft and the limiting groove are movably assembled, a limiting block is fixedly assembled on the optical fiber connector mounting shell, the optical fiber connector mounting shell is movably assembled with the optical fiber connector movable shell, and the optical fiber connector mounting shell is connected in the optical fiber connector movable shell; However, in the above scheme, the connector can only be installed on one end of the optical fiber at a time. Then, when the optical fibers are connected, a coupler is required to connect the connectors at both ends, resulting in low efficiency in actual assembly and disassembly. For this reason, the present invention proposes an optical fiber connector that is easy to disassemble and assemble to solve the above problem. Summary of the invention

[0003] The object of the present invention is to provide an optical fiber connector that is easy to assemble and disassemble, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: an optical fiber connector that is easy to assemble and disassemble, comprising: A positioning seat, the positioning seat is used to position the primary optical fiber and the secondary optical fiber, and the positioning seat includes a first seat body, a threaded seat, a second seat body, a primary positioning member and a secondary positioning member, the first seat body, the threaded seat and the second seat body are integrally formed, and mounting holes are formed through the first seat body, the threaded seat and the second seat body, and a screw seat is integrally formed at the outer end of the second seat body; A docking seat, wherein the docking seat is installed in the installation hole, and the cores of the primary optical fiber and the secondary optical fiber are docked through the core holes on the docking seat; A fastening seat, wherein the inner side wall of the fastening seat is formed with a primary stress-bearing surface, a threaded hole and a secondary stress-bearing surface, the first seat body and the second seat body are respectively provided with a primary mounting groove and a secondary mounting groove, the primary positioning member and the secondary positioning member are respectively movably installed in the primary mounting groove and the secondary mounting groove, and the primary positioning member and the secondary positioning member are both limited by the fastening seat, and the outer protective layers of the primary optical fiber and the secondary optical fiber are respectively positioned by the primary positioning member and the secondary positioning member.

[0005] Preferably, the cross-sections of the primary mounting groove and the secondary mounting groove are both convex-shaped, and the primary mounting groove and the secondary mounting groove are evenly circumferentially provided with a circle, and the primary positioning member is composed of a pressure seat, a primary force-bearing seat, a primary spring sheet and a pressing protrusion, and the pressure seat, the primary force-bearing seat, the primary spring sheet and the pressing protrusion are integrally formed.

[0006] Preferably, the pressure seat and the first-level force-bearing seat are movably arranged in the first-level mounting groove, the pressing protrusion is a protrusion structure with a semicircular cross-section, and the pressing protrusions are arranged in a row at equal intervals, and the first-level spring plates are arranged in a row at equal intervals on both sides of the first-level force-bearing seat, and the slope value of the outer wall of the first-level force-bearing seat is consistent with the slope value of the first-level force surface.

[0007] Preferably, when the fastening seat is actually installed, the threaded hole is screwed onto the threaded seat, and the first-level force-bearing seat is set against the first-level force-bearing surface. At this time, the first-level spring sheet is bent under pressure, and the pressure seat is pushed inward, so that the pressing protrusion is embedded in the outer protective layer of the first-level optical fiber, thereby forming a positioning effect on the first-level optical fiber.

[0008] Preferably, both side walls of the first-level mounting groove are provided with card slots, and a card is formed at the end of the first-level spring sheet. When the first-level positioning piece is actually installed, the card is engaged in the card slot, and when the first-level spring sheet is in a reset state, the end of the first-level force-bearing seat protrudes out of the outside of the first-level mounting groove.

[0009] Preferably, both sides of the first-level force-bearing seat are provided with air-avoiding grooves, and the air-avoiding grooves are arranged corresponding to the first-level spring pieces.

[0010] Preferably, the structure of the secondary positioning member is the same as that of the primary positioning member, and the installation method of the secondary positioning member is the same as that of the primary positioning member. The secondary positioning member is subjected to force by contacting with the secondary force-bearing surface, thereby forming a positioning effect on the outer protective layer of the secondary optical fiber.

[0011] Preferably, a guide groove is provided on the side wall of the mounting hole, and a guide protrusion is integrally formed on the outer side wall of the docking seat. When the docking seat is actually installed, the guide protrusion is embedded in the guide groove, the open end of the guide groove faces the first seat body, and the guide groove does not pass through the second seat body.

[0012] Preferably, a three-stage installation groove is provided on the first seat body, the cross-section of the three-stage installation groove is convex-shaped, and a three-stage positioning member is movably arranged in the three-stage installation groove, the three-stage positioning member includes a three-stage force-bearing seat, a stop seat and a three-stage spring sheet, the three-stage force-bearing seat, the stop seat and the three-stage spring sheet are integrally formed, and the installation method of the three-stage positioning member is the same as that of the first-stage positioning member, and when the fastening seat is actually tightened, the first-stage force-bearing face generates a force on the three-stage force-bearing seat, thereby pushing the stop seat to move inward, thereby forming a supporting and positioning effect on the end of the guide protrusion through the side of the stop seat.

[0013] Preferably, a locking groove is provided on the side wall of the port of the secondary force-bearing surface, and the locking groove is arranged in a circle. A four-level mounting groove is provided on the side wall of the screw seat, and a pressing seat is movably installed in the four-level mounting groove. The pressing seat is connected to the bottom of the four-level mounting groove through an elastic support member, and a locking block is integrally formed on the pressing seat. When the fastening seat is actually tightened and the elastic support member is in a reset state, the locking block is embedded in the locking groove, and when the pressing seat is completely pressed into the four-level mounting groove, the locking block is completely detached from the locking groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. An optical fiber connector that is easy to disassemble and assemble is provided, which is composed of a positioning seat, a docking seat and a fastening seat, and the positioning seat is provided to be composed of a first seat body, a threaded seat, a second seat body, a primary positioning member and a secondary positioning member, and a primary force-bearing surface, a threaded hole and a secondary force-bearing surface are provided on the inner side wall of the fastening seat, so that the primary force-bearing surface and the secondary force-bearing surface exert a force on the primary positioning member and the secondary positioning member, so that when the fastening seat is screwed and tightened, the primary optical fiber and the secondary optical fiber can be positioned and docked, thereby effectively improving the efficiency of optical fiber disassembly and assembly; 2. A three-level installation groove is opened on the first seat body, and a three-level positioning member composed of a three-level force-bearing seat, a stop seat, and a three-level spring piece is arranged in the three-level installation groove, so that a force is generated on the three-level force-bearing seat through the first-level force-bearing surface to push the stop seat to form a supporting effect on the end of the guide protrusion, thereby ensuring the stability of the docking seat and improving the connection stability of the first-level optical fiber and the second-level optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view along the third-level positioning member of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle; Figure 4 for Figure 2A magnified schematic diagram of the structure at B in the middle; Figure 5 It is a cross-sectional view of the present invention along the positions of the primary positioning member and the secondary positioning member; Figure 6 for Figure 5 A magnified schematic diagram of the structure at C in the middle; Figure 7 This is a schematic diagram of the positioning seat structure of the present invention; Figure 8 It is a schematic diagram of the structure of the fastening seat of the present invention; Fig. 9 This is a schematic diagram of the structure of the primary positioning member of the present invention; Fig.10 It is a schematic diagram of the structure of the secondary positioning member of the present invention; Fig.11 This is a schematic diagram of the structure of the three-level positioning member of the present invention; Fig.12 It is a schematic diagram of the docking seat structure of the present invention.

[0016] In the figure: positioning seat 1, docking seat 2, fastening seat 3, primary optical fiber 4, secondary optical fiber 5, mounting hole 6, screw seat 7, first seat body 8, threaded seat 9, second seat body 10, primary positioning member 11, secondary positioning member 12, primary force surface 13, threaded hole 14, secondary force surface 15, primary mounting groove 16, pressure seat 17, primary force seat 18, primary spring piece 19, pressing protrusion 20, card 21, wire core 22, wire core hole 23, guide groove 24, guide protrusion 25, tertiary mounting groove 26, tertiary positioning member 27, tertiary force seat 28, blocking seat 29, tertiary spring piece 30, air avoidance groove 31, locking groove 32, fourth mounting groove 33, pressing seat 34, elastic support member 35, locking block 36. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 12 The present invention provides the following three preferred embodiments: Embodiment 1: An optical fiber connector that is easy to disassemble and assemble, comprising a positioning seat 1, a docking seat 2 and a fastening seat 3, the positioning seat 1 is used to position the primary optical fiber 4 and the secondary optical fiber 5, and the positioning seat 1 comprises a first seat body 8, a threaded seat 9, a second seat body 10, a primary positioning member 11 and a secondary positioning member 12, the first seat body 8, the threaded seat 9, and the second seat body 10 are integrally formed, and the first seat body 8, the threaded seat 9, and the second seat body 10 are penetrated with a mounting hole 6, and the outer end of the second seat body 10 is integrally formed with a screw seat 7, the docking seat 2 is installed in the mounting hole 6, the primary optical fiber 4, the secondary optical The wire core 22 on the fiber 5 is docked through the wire core hole 23 on the docking seat 2. The inner side wall of the fastening seat 3 is formed with a primary stress surface 13, a threaded hole 14 and a secondary stress surface 15. The first seat body 8 and the second seat body 10 are respectively provided with a primary mounting groove 16 and a secondary mounting groove. The primary positioning member 11 and the secondary positioning member 12 are respectively movably installed in the primary mounting groove 16 and the secondary mounting groove, and the primary positioning member 11 and the secondary positioning member 12 are both limited by the fastening seat 3. The outer protective layers of the primary optical fiber 4 and the secondary optical fiber 5 are respectively positioned by the primary positioning member 11 and the secondary positioning member 12.

[0019] The cross-sections of the primary mounting groove 16 and the secondary mounting groove are both convex, and the primary mounting groove 16 and the secondary mounting groove are evenly arranged in a circle. The primary positioning member 11 is composed of a pressure seat 17, a primary force seat 18, a primary spring sheet 19 and a pressing protrusion 20. The pressure seat 17, the primary force seat 18, the primary spring sheet 19 and the pressing protrusion 20 are integrally formed. The pressure seat 17 and the primary force seat 18 are movably arranged in the primary mounting groove 16. The pressing protrusion 20 is a convex structure with a semicircular cross-section, and the pressing protrusion 20 is evenly spaced and arranged in a row. The primary spring sheet 19 is on the primary force seat 18. There is a row of evenly spaced threads on both sides of the first-level force-bearing seat 18, and the slope value of the outer wall of the first-level force-bearing seat 18 matches the slope value of the first-level force-bearing surface 13. When the fastening seat 3 is actually installed, the threaded hole 14 is screwed on the threaded seat 9, and the first-level force-bearing seat 18 is set against the first-level force-bearing surface 13. At this time, the first-level spring piece 19 is compressed and bent, and the pressure seat 17 is pushed inward, so that the pressing protrusion 20 is embedded in the outer protective layer of the first-level optical fiber 4, thereby forming a positioning effect on the first-level optical fiber 4. The pressing protrusion 20 is embedded in the outer protective layer of the optical fiber, which can form a meshing positioning effect, thereby ensuring the connection strength of the optical fiber docking point.

[0020] Both side walls of the primary mounting groove 16 are provided with card slots, and a card 21 is formed at the end of the primary spring piece 19. When the primary positioning member 11 is actually installed, the card 21 is engaged in the card slot. When the primary spring piece 19 is in the reset state, the end of the primary force-bearing seat 18 protrudes out of the outside of the primary mounting groove 16 and is embedded in the card slot through the card 21, thereby improving the installation convenience of the primary positioning member 11.

[0021] Both sides of the primary force bearing seat 18 are provided with avoidance grooves 31 , which are arranged corresponding to the primary spring pieces 19 , so that the staff can use tools to push the card 21 to ensure that the card 21 can be stably embedded in the card slot.

[0022] The structure of the secondary positioning member 12 is the same as that of the primary positioning member 11, and the installation method of the secondary positioning member 12 is the same as that of the primary positioning member 11. The secondary positioning member 12 is subjected to force by contacting with the secondary force-bearing surface 15, thereby forming a positioning effect on the outer protective layer of the secondary optical fiber 5. By setting an optical fiber connector that is easy to disassemble and assemble and is composed of a positioning seat 1, a docking seat 2 and a fastening seat 3, and the positioning seat 1 is set to be composed of a first seat body 8, a threaded seat 9, a second seat body 10, a primary positioning member 11 and a secondary positioning member 12, and a primary force-bearing surface 13, a threaded hole 14 and a secondary force-bearing surface 15 are set on the inner side wall of the fastening seat 3, so that the primary positioning member 11 and the secondary positioning member 12 are exerted with force through the primary force-bearing surface 13 and the secondary force-bearing surface 15, so that when the fastening seat 3 is screwed and tightened, the primary optical fiber 4 and the secondary optical fiber 5 can be positioned and docked, thereby effectively improving the disassembly and assembly efficiency of the optical fiber.

[0023] Embodiment 2: Based on Embodiment 1, a guide groove 24 is provided on the side wall of the mounting hole 6, and a guide protrusion 25 is integrally formed on the outer wall of the docking seat 2. When the docking seat 2 is actually installed, the guide protrusion 25 is embedded in the guide groove 24, and the open end of the guide groove 24 faces the first seat body 8, and the guide groove 24 does not pass through the second seat body 10.

[0024] The first seat body 8 is provided with a three-stage installation groove 26, the cross section of which is convex, and a three-stage positioning member 27 is movably provided in the three-stage installation groove 26, the three-stage positioning member 27 includes a three-stage force-bearing seat 28, a stop seat 29 and a three-stage spring sheet 30, the three-stage force-bearing seat 28, the stop seat 29 and the three-stage spring sheet 30 are integrally formed, and the installation method of the three-stage positioning member 27 is the same as the installation method of the first-stage positioning member 11, and when the fastening seat 3 is actually tightened, the first-stage force-bearing surface 13 generates a force on the three-stage force-bearing seat 28, thereby pushing the stop seat 29 The first seat 8 moves inward, thereby forming a supporting and positioning effect on the end of the guide protrusion 25 through the side of the stop seat 29. By opening a three-level installation groove 26 on the first seat body 8, and arranging a three-level positioning member 27 composed of a three-level force-bearing seat 28, a stop seat 29, and a three-level spring piece 30 in the three-level installation groove 26, a force is applied to the three-level force-bearing seat 28 through the first force-bearing surface 13 to push the stop seat 29 to form a supporting effect on the end of the guide protrusion 25, thereby ensuring the stability of the docking seat 2 and improving the connection stability of the first-level optical fiber 4 and the second-level optical fiber 5.

[0025] Embodiment 3: On the basis of embodiment 2, a snap-fit ​​groove 32 is provided on the side wall of the port of the secondary force-bearing surface 15, and the snap-fit ​​groove 32 is provided with a circle. A fourth-level mounting groove 33 is provided on the side wall of the screw seat 7, and a pressing seat 34 is movably installed in the fourth-level mounting groove 33. The pressing seat 34 is connected to the bottom of the fourth-level mounting groove 33 through an elastic support member 35. A snap-fit ​​block 36 is integrally formed on the pressing seat 34. When the fastening seat 3 is actually tightened, the elastic support member 35 is in a reset state. When the locking block 36 is embedded in the locking groove 32 and the pressing seat 34 is completely pressed into the fourth-level installation groove 33, the locking block 36 is completely disengaged from the locking groove 32, and the pressing seat 34 is pushed by the force of the elastic support member 35 to allow the locking block 36 to be embedded in the locking groove 32, thereby forming a self-locking effect on the fastening seat 3, thereby preventing the fastening seat 3 from loosening under the action of external vibration force, thereby affecting the docking stability of the primary optical fiber 4 and the secondary optical fiber 5.

[0026] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. An optical fiber connector that is easy to assemble and disassemble, characterized in that: include: A positioning seat (1), the positioning seat (1) being used to position a primary optical fiber (4) and a secondary optical fiber (5), and the positioning seat (1) comprising a first seat body (8), a threaded seat (9), a second seat body (10), a primary positioning piece (11) and a secondary positioning piece (12), the first seat body (8), the threaded seat (9) and the second seat body (10) being integrally formed, and a mounting hole (6) is formed through the first seat body (8), the threaded seat (9) and the second seat body (10), and a screw seat (7) is integrally formed on the outer end of the second seat body (10); A docking seat (2), the docking seat (2) being installed in the installation hole (6), and the wire cores (22) on the primary optical fiber (4) and the secondary optical fiber (5) are docked through the wire core holes (23) on the docking seat (2); A fastening seat (3), wherein the inner side wall of the fastening seat (3) is formed with a primary force-bearing surface (13), a threaded hole (14) and a secondary force-bearing surface (15); the first seat body (8) and the second seat body (10) are respectively provided with a primary installation groove (16) and a secondary installation groove; the primary positioning member (11) and the secondary positioning member (12) are respectively movably mounted in the primary installation groove (16) and the secondary installation groove; and the primary positioning member (11) and the secondary positioning member (12) are both limited by the fastening seat (3); and the outer protective layers of the primary optical fiber (4) and the secondary optical fiber (5) are respectively positioned by the primary positioning member (11) and the secondary positioning member (12).

2. The optical fiber connector that is easy to assemble and disassemble according to claim 1, characterized in that: The cross-sections of the primary installation groove (16) and the secondary installation groove are both convex-shaped, and the primary installation groove (16) and the secondary installation groove are evenly arranged with a circle. The primary positioning member (11) is composed of a pressure seat (17), a primary force-bearing seat (18), a primary spring sheet (19) and a pressing protrusion (20). The pressure seat (17), the primary force-bearing seat (18), the primary spring sheet (19) and the pressing protrusion (20) are integrally formed.

3. The optical fiber connector that is easy to assemble and disassemble according to claim 2, characterized in that: The pressure seat (17) and the first-level force-bearing seat (18) are both movably arranged in the first-level installation groove (16); the pressing protrusion (20) is a protrusion structure with a semicircular cross-section, and the pressing protrusions (20) are arranged in a row at equal intervals; the first-level spring plates (19) are arranged in a row at equal intervals on both sides of the first-level force-bearing seat (18); and the slope value of the outer wall of the first-level force-bearing seat (18) is consistent with the slope value of the first-level force-bearing surface (13).

4. The optical fiber connector that is easy to assemble and disassemble according to claim 3, characterized in that: When the fastening seat (3) is actually installed, the threaded hole (14) is screwed onto the threaded seat (9), the primary force-bearing seat (18) is arranged to abut against the primary force-bearing surface (13), and at this time, the primary spring sheet (19) is compressed and bent, and the pressure seat (17) is pushed inward, so that the pressing protrusion (20) is embedded in the outer protective layer of the primary optical fiber (4), thereby forming a positioning effect on the primary optical fiber (4).

5. The optical fiber connector that is easy to assemble and disassemble according to claim 4, characterized in that: Both side walls of the primary installation groove (16) are provided with a card slot, and a card (21) is formed at the end of the primary spring sheet (19). When the primary positioning member (11) is actually installed, the card (21) is engaged in the card slot, and when the primary spring sheet (19) is in a reset state, the end of the primary force bearing seat (18) protrudes outside the primary installation groove (16).

6. The optical fiber connector that is easy to assemble and disassemble according to claim 5, characterized in that: Both sides of the first-level force bearing seat (18) are provided with air avoidance grooves (31), and the air avoidance grooves (31) are arranged corresponding to the first-level spring pieces (19).

7. The optical fiber connector that is easy to assemble and disassemble according to claim 6, characterized in that: The structure of the secondary positioning member (12) is the same as that of the primary positioning member (11), and the installation method of the secondary positioning member (12) is the same as that of the primary positioning member (11). The secondary positioning member (12) is subjected to force by contact with the secondary force-bearing surface (15), thereby forming a positioning effect on the outer protective layer of the secondary optical fiber (5).

8. The optical fiber connector that is easy to assemble and disassemble according to claim 7, characterized in that: A guide groove (24) is formed on the side wall of the mounting hole (6), and a guide protrusion (25) is integrally formed on the outer side wall of the docking seat (2). When the docking seat (2) is actually installed, the guide protrusion (25) is embedded in the guide groove (24), the open end of the guide groove (24) faces the first seat body (8), and the guide groove (24) does not penetrate the second seat body (10).

9. The optical fiber connector that is easy to assemble and disassemble according to claim 8, characterized in that: The first seat body (8) is provided with a three-stage installation groove (26), the cross section of which is in the shape of a convex letter, and a three-stage positioning member (27) is movably arranged in the three-stage installation groove (26), the three-stage positioning member (27) comprising a three-stage force-bearing seat (28), a stop seat (29) and a three-stage spring sheet (30), the three-stage force-bearing seat (28), the stop seat (29) and the three-stage spring sheet (30) are integrally formed, and the installation method of the three-stage positioning member (27) is the same as the installation method of the first-stage positioning member (11), and when the fastening seat (3) is actually tightened, the first-stage force-bearing surface (13) generates a force on the three-stage force-bearing seat (28), thereby pushing the stop seat (29) to move inward, thereby forming a holding and positioning effect on the end of the guide protrusion (25) through the side of the stop seat (29).

10. The optical fiber connector that is easy to assemble and disassemble according to claim 9, characterized in that: A snap-fitting groove (32) is provided on the side wall of the port of the secondary force-bearing surface (15), and the snap-fitting groove (32) is provided with a circle. A fourth-level mounting groove (33) is provided on the side wall of the screwing seat (7), and a pressing seat (34) is movably installed in the fourth-level mounting groove (33). The pressing seat (34) is connected to the bottom of the fourth-level mounting groove (33) through an elastic support member (35), and a snap-fitting block (36) is integrally formed on the pressing seat (34). When the fastening seat (3) is actually tightened and the elastic support member (35) is in a reset state, the snap-fitting block (36) is embedded in the snap-fitting groove (32), and when the pressing seat (34) is completely pressed into the fourth-level mounting groove (33), the snap-fitting block (36) is completely separated from the snap-fitting groove (32).

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