Optical fiber card connection structure and optical fiber sensor having the same

Abstract

The present invention relates to the technical field of photoelectric sensors, and in particular to an optical fiber clamping structure and an optical fiber sensor having the same. In the optical fiber clamping structure, a movable part with an axis structure is separately provided above the pressing part. The axis structure can movably pass through the frame of the optical fiber clamping structure to extend into the clamping cavity to drive the pressing part to press the optical fiber clamping ring; a first sealing ring is provided between the axis structure and the frame, thereby achieving a seal between the movable part and the frame, making the optical fiber clamping structure of the present invention suitable for waterproof requirements. The design of the axis structure facilitates the installation of the sealing ring, and the separate movable part further increases the convenience of assembling the sealing ring thereon. The optical fiber sensor is provided with the above-mentioned optical fiber clamping structure with a sealing structure at the optical fiber clamping structure, thereby improving the waterproof performance of the optical fiber sensor and the stability of the optical fiber clamping.

Description

Technical Field

[0001] The present invention relates to the technical field of photoelectric sensors, and in particular to an optical fiber card connection structure and an optical fiber sensor having the same. Background Art

[0002] A photoelectric sensor uses light to detect objects. It emits detection light and receives that light, or light reflected or transmitted by the object, to make a judgment. A fiber optic sensor is a photoelectric sensor based on optical fibers, using light as the carrier of sensitive information and optical fiber as the medium for transmitting that information. A fiber optic sensor primarily consists of a fiber optic sensing head and a fiber optic amplifier. The fiber optic sensor includes an output fiber and an input fiber, both of which are mounted to the amplifier's base using a snap-fit mechanism.

[0003] The existing fiber optic sensor's snap-in structure uses a fiber optic clamping lever to directly drive a movable bracket to compress an open fiber optic clamp ring, thereby locking and securing the optical fiber. However, this snap-in structure has poor sealing performance and, due to structural limitations, is not conducive to the assembly of the sealing ring. Therefore, this existing snap-in structure cannot meet specific waterproofing requirements. Furthermore, when the clamping lever is released, the existing fiber optic snap-in structure utilizes the rebound force of the fiber optic clamp ring to eject the movable bracket upward, thereby releasing the optical fiber. However, if the movable bracket structure is relatively complex or there is significant resistance, it may be impossible to release the optical fiber. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, thereby providing an optical fiber card connection structure and an optical fiber sensor having the same.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] The present invention provides an optical fiber clamping structure, which includes: a base and a frame, wherein the frame is tightly connected to the base, and a clamping cavity is provided between the frame and the base; an optical fiber clamping ring is arranged in the clamping cavity, and the optical fiber clamping ring has at least one cylindrical structure, and the side wall of the cylindrical structure has a transverse opening; a movable part has an axis structure, and the axis structure can movably pass through the frame and extend into the clamping cavity, and a first sealing ring is provided between the axis structure and the frame; a pressing part can be movably provided between the movable part and the optical fiber clamping ring, and the pressing part is suitable for being driven by the movable part to press the optical fiber clamping ring; the frame also has an optical fiber hole connected to the cylindrical structure frame.

[0007] In the optical fiber clamping structure provided by the present invention, the optical fiber clamping ring is integrally formed; wherein, two cylindrical structures are provided in sequence in the upper and lower directions, the lateral openings of the two cylindrical structures are in opposite directions, and the side wall of each opening located above extends laterally outward to form an extrusion section.

[0008] In the optical fiber clamping structure provided by the present invention, the front surface of the pressing member has a first arm and a second arm extending toward the direction of the optical fiber clamp ring, and the first arm and the second arm are respectively suitable for abutting against the extrusion sections of the two cylindrical structures; the back surface of the pressing member has an abutting surface facing the movable member and adapted to the movable member.

[0009] In the optical fiber clamping structure provided by the present invention, the optical fiber clamping ring also has a limiting structure, which is arranged on the back side of the opening of the cylindrical structure located above and extends outward; the second arm of the pressing member is also provided with a sliding groove that slides and matches with the limiting structure.

[0010] In the optical fiber clamping structure provided by the present invention, the shaft structure is provided with an annular groove, and the first sealing ring is assembled on the annular groove.

[0011] The optical fiber clamping structure provided by the present invention also includes a rotating lever, which is rotatably arranged above the movable part, and the rotating lever includes a wrench and a cam shaft as a rotating body; the cam shaft has a flat-bottomed groove on the side facing the wrench; the movable part also has an L-shaped frame, and the L-shaped frame is located at the top of the shaft structure; the L-shaped frame has a bottom surface suitable for abutting against the outer edge of the cam shaft, and a protrusion extending into the flat-bottomed groove; the rotating lever and the movable part have a first state of mutual cooperation and locking and a second state of loosening. In the first state, the outer edge of the cam shaft abuts against the bottom surface, pressing down the movable part, thereby tightening the optical fiber clamp; in the second state, the bottom of the flat-bottomed groove abuts against the protrusion, pulling the movable part upward, thereby loosening the optical fiber clamp.

[0012] Furthermore, in the optical fiber clamping structure provided by the present invention, the outer edge of the cam shaft abutting against the bottom surface has a V-shaped groove structure.

[0013] The optical fiber clamping structure provided by the present invention also includes a second sealing ring and a third sealing ring. The second sealing ring is arranged at the contact portion between the base and the frame; the third sealing ring is arranged on the back side of the frame, and the third sealing ring is arranged corresponding to the optical fiber through hole.

[0014] In the optical fiber clamping structure provided by the present invention, a sealing ring clamping groove is provided on the back side of the frame body, and the third sealing ring is arranged in the sealing ring clamping groove.

[0015] The optical fiber clamping structure provided by the present invention further includes a housing, which is arranged on the back side of the frame and covers and compresses the third sealing ring.

[0016] In the optical fiber clamping structure provided by the present invention, the frame body has an annular groove, and the second sealing ring is arranged in the annular groove.

[0017] The present invention also provides an optical fiber sensor, which includes a light emitting unit, a light receiving unit, two optical fibers, and the above-mentioned optical fiber clamping structure; the two optical fibers are respectively locked by the optical fiber clamping structure and correspond to the light emitting unit and the light receiving unit.

[0018] The optical fiber sensor provided by the present invention further comprises a housing, wherein the light emitting unit and the light receiving unit are arranged in the housing, and the side wall of the housing constitutes the base.

[0019] The technical solution of the present invention has the following advantages:

[0020] 1. The optical fiber clamp structure provided by the present invention features a separate movable member having a shaft structure disposed above the pressing member. This shaft structure can be movably passed through the frame of the optical fiber clamp structure to extend into the clamping cavity, driving the pressing member to compress the optical fiber clamp ring. A first sealing ring is provided between the shaft structure and the frame, thereby achieving a seal between the movable member and the frame, making the optical fiber clamp structure of the present invention suitable for waterproofing. The shaft structure design facilitates the installation of the sealing ring, and the separate movable member further enhances the ease of assembly of the sealing ring thereon.

[0021] 2. The optical fiber clamping structure provided by the present invention is characterized in that the outer edge of the cam shaft can be abutted against the movable part by rotating the rotary lever, thereby pressing the optical fiber clamping ring; when the rotary lever is rotated in the opposite direction, the flat-bottom groove of the cam shaft drives the protrusion of the movable part, thereby pulling the movable part upward, so that the pressing part releases the optical fiber clamping ring. At this time, since the movable part is driven upward by the cam shaft, only the pressing part pops up under the action of the rebound force of the optical fiber clamping ring, reducing the resistance that the optical fiber clamping ring needs to overcome to return to a relaxed state, thereby improving the stability of the optical fiber clamping.

[0022] 3. The optical fiber clamping structure provided by the present invention is further provided with a second sealing ring at the contact portion between the base and the frame, and a third sealing ring is further provided on the back side of the frame corresponding to the optical fiber through hole. The arrangement of the sealing ring further improves the sealing performance of the optical fiber clamping structure.

[0023] 4. The optical fiber clamping structure provided by the present invention is provided with a limiting structure extending outward on the back side of the opening of the cylindrical structure located above, and a sliding groove that slides and matches with the limiting structure is provided on the second arm of the pressing member. Through the guiding and limiting effects of the limiting structure and the sliding groove, the pressing member is prevented from deviating outward, thereby increasing the stability of the action.

[0024] 5. The optical fiber sensor provided by the present invention is provided with the above-mentioned optical fiber clamping structure with a sealing structure at the optical fiber clamping structure, thereby improving the waterproof performance of the optical fiber sensor and the stability of the optical fiber clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic structural diagram of an optical fiber sensor provided in an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the internal structure of the optical fiber card connection provided in the embodiment of the present invention Figure 1 ;

[0028] Figure 3 Schematic diagram of the internal structure of the fiber card connection provided in the embodiment of the present invention Figure 2 ;

[0029] Figure 4 A schematic diagram of a base structure provided in an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of an optical fiber card connection structure provided in an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of the frame structure provided in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the structure of a rotary lever provided in an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of the structure of movable parts provided in an embodiment of the present invention;

[0034] Figure 9 A schematic diagram of the structure of a pressing member provided in an embodiment of the present invention;

[0035] Figure 10A schematic diagram of the structure of an optical fiber clamp provided in an embodiment of the present invention;

[0036] Figure 11 1. It is an assembly diagram of the optical fiber clamp, the pressing member and the movable member in an embodiment of the present invention;

[0037] Figure 12 FIG1 is an assembly diagram of an optical fiber clamp and a pressing member in an embodiment of the present invention;

[0038] Figure 13 This is a schematic diagram of the housing structure provided in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1-base (housing), 11-base slot, 12-fixing hole, 13-fiber through hole, 14-hinge seat, 15-panel, 16-cable, 2-frame, 21-second sealing ring slot, 22-card cavity wall, 221-frame fiber hole, 23-frame mounting hole, 24-frame hinge seat, 25-third sealing ring slot, 3-rotating lever, 31-wrench, 32-camshaft, 321-flat bottom groove, 322-hinge shaft, 323-V-shaped groove structure, 4-movable parts, 41-shaft Structure, 411-annular groove, 42-bottom surface, 43-protrusion, 44-first sealing ring, 5-pressure piece, 51-abutment surface, 511-extrusion surface, 52-first arm, 53-second arm, 531-sliding groove, 6-fiber clamp, 61-first cylindrical structure, 611-first extrusion section, 612-limiting structure, 62-second cylindrical structure, 621-second extrusion section, 7-housing, 71-housing fiber hole, 72-locking hole, 8-third sealing ring, 9-second sealing ring. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Example 1

[0045] This embodiment provides an optical fiber card connection structure, such as Figure 2-13 As shown, it includes a base 1 and a frame 2, the frame 2 is fastened to the base 1, and a clamping cavity is provided between the frame 2 and the base 1, and the clamping cavity can be defined by the clamping cavity wall 22 of the frame 2; wherein, the base 1 can also be provided with a base groove 11, and the base groove 11 can define the above-mentioned clamping cavity together with the clamping cavity wall 22. A fiber clamp 6 is provided in the clamping cavity, as shown in FIG. Figure 10 As shown, the optical fiber clamp 6 provided in this embodiment has two cylindrical structures, namely a first cylindrical structure 61 and a second cylindrical structure 62 arranged in sequence in the upper and lower directions. The two cylindrical structures respectively have a transverse opening, and the transverse opening directions are opposite. The side wall of each opening located above extends laterally outward to form an extrusion section, which includes a first extrusion section 611 and a second extrusion section 621. In order to make the cylindrical structure of the optical fiber clamp have good rebound performance, the optical fiber clamp can be selected to be integrally formed.

[0046] The optical fiber clamping structure provided in this embodiment also includes a movable part 4 and a pressing part 5. The movable part 4 has an axis structure 41, which can movably pass through the frame 2 and extend into the clamping cavity. When driven by an external force, the axis structure 41 of the movable part can move into the frame 2 to drive the pressing part 5 to press the optical fiber clamp 6. A first sealing ring 44 is provided between the axis structure 41 and the frame 2 to ensure that the axis structure can achieve a sealing effect during movement. In order to ensure the assembly stability of the first sealing ring 44 on the axis structure, preferably, an annular groove 411 can be provided on the axis structure, and the first sealing ring 44 is assembled on the annular groove 411. The pressing part 5 can be movably provided between the movable part 4 and the optical fiber clamp 6. The pressing part 5 is suitable for being driven by the movable part 4 to press the optical fiber clamp 6. The frame 2 also has an optical fiber hole 221 that is aligned with the cylindrical structure frame.

[0047] The optical fiber clamp structure provided in this embodiment features a separate movable member having a shaft structure disposed above the pressing member. This shaft structure can be movably passed through the frame of the optical fiber clamp structure to extend into the clamping cavity, driving the pressing member to compress the optical fiber clamp ring. A first sealing ring is provided between the shaft structure and the frame, thereby achieving a seal between the movable member and the frame, making the optical fiber clamp structure of the present invention suitable for waterproofing. The shaft structure design facilitates the installation of the sealing ring, and the separate movable member further increases the ease of assembly of the sealing ring thereon.

[0048] In the optical fiber clamping structure provided in this embodiment, the front face of the pressing member 5 includes a first arm 52 and a second arm 53 extending toward the optical fiber clamp 6. The first arm 52 and the second arm 53 are adapted to abut against the first extrusion section 611 and the second extrusion section 621, respectively. The back face of the pressing member 5 includes an abutment surface 51 facing the movable member 4 and adapted to mate with the movable member 4. The front face of the pressing member 5 includes an extrusion surface 511 facing the optical fiber clamp 6. The first arm 52 and the second arm 53 are located on either side of the extrusion surface 511. By squeezing the first and second cylindrical structures 61 and 62 of the optical fiber clamp 6 on both sides, the operational stability of the entire clamping structure can be improved. Preferably, in this embodiment, the tops of the first arm 52 and the second arm 53 both have chamfered structures. The upper surfaces of the first and second extrusion sections 611 and 621 both have guiding slopes corresponding to the chamfered structures, thereby more easily guiding the movement of the first and second arms.

[0049] The optical fiber card connection structure provided in this embodiment is as follows: Figure 7As shown, it also includes a rotating lever 3, which is rotatably arranged above the movable part 4, and the rotating lever 3 includes a wrench 31 and a camshaft 32 as a rotating body; the camshaft 32 has a flat-bottomed groove 321 on the side facing the wrench 31; the movable part 4 also has an L-shaped frame, and the L-shaped frame is located at the top of the shaft structure 41; the L-shaped frame has a bottom surface 42 suitable for abutting against the outer edge of the camshaft, and a protrusion 43 extending into the flat-bottomed groove; the rotating lever 3 can cooperate with the movable part 4, and the movable part 4 can be pressed downward or pulled upward by toggling the rotating lever 3. When the rotating lever 3 is toggled, the rotating lever 3 and the movable part 4 have a first state of mutual cooperation and locking, and a second state of loosening. In the first state, that is, when the rotating lever 3 presses the movable part 4 downward, the outer edge of the cam shaft abuts against the bottom surface 42, pressing the movable part 4 downward, thereby tightening the optical fiber clamp 6 to achieve optical fiber clamping. At this time, the outer edge of the cam shaft abutting against the bottom surface 42 is located at the outer edge of the longer diameter of the cam shaft 32; in the second state, that is, when the rotating lever 3 pulls the movable part 4 upward, the bottom of the flat-bottom groove 321 abuts against the protrusion 43, pulling the movable part 4 upward, thereby loosening the optical fiber clamp 6.

[0050] The optical fiber clamping structure provided in this embodiment is characterized in that the outer edge of the cam shaft can be abutted against the movable part by rotating the rotary lever, thereby pressing the optical fiber clamping ring; when the rotary lever is rotated in the opposite direction, the flat-bottom groove of the cam shaft drives the protrusion of the movable part, thereby pulling the movable part upward to cause the pressing part to release the optical fiber clamping ring. At this time, since the movable part is driven upward by the cam shaft, only the pressing part pops up under the rebound force of the optical fiber clamping ring, reducing the resistance that the optical fiber clamping ring needs to overcome to return to a relaxed state, thereby improving the stability of the optical fiber clamping.

[0051] Optionally, in the above-mentioned optical fiber clamping structure, there are hinge shafts 322 on both sides of the cam shaft 32, and the hinge shafts 322 are assembled between the base 1 and the frame 2; specifically, a hinge seat 14 is provided on the base 1, and a frame hinge seat 24 is provided on the frame 2. The two hinge seats are arranged correspondingly, forming a hinge through hole for the hinge shaft 322 to pass through.

[0052] In the optical fiber clamping structure provided in this embodiment, the outer edge of the cam shaft abutting against the bottom surface has a V-shaped groove structure 323, which can further improve the stability of the pressing process and prevent the cam shaft from automatically bouncing open due to sliding.

[0053] In the optical fiber clamping structure provided in this embodiment, the optical fiber clamp ring 6 further includes a limiting structure 612, which is disposed on the back side of the opening of the upper cylindrical structure and extends outward, that is, disposed on the back side of the opening of the first cylindrical structure 61. The second arm 53 of the pressing member 5 also includes a sliding groove 531 that slidably mates with the limiting structure 612. The guiding and limiting effects of the limiting structure and the sliding groove prevent the pressing member from deflecting outward, thereby increasing the stability of its operation.

[0054] The optical fiber clamping structure provided in this embodiment also includes a second sealing ring 9 and a third sealing ring 8. The second sealing ring 9 is arranged at the contact part between the base 1 and the frame 2. Specifically, the second sealing ring 9 can be placed in the second sealing ring clamping groove 21 on the frame 2, and the frame 2 can be assembled to the fixing hole 12 on the base 1 by passing the locking screw through the frame mounting hole 23. At this time, the frame 2 presses the second sealing ring 9 to improve its sealing effect; the third sealing ring 8 is arranged on the back side of the frame 2. Specifically, a third sealing ring clamping groove 25 is provided on the back side of the frame 2. The third sealing ring 8 is arranged in the third sealing ring clamping groove 25, and the third sealing ring 8 is in the shape of an "8" as a whole, which is arranged corresponding to the optical fiber through hole 13.

[0055] The optical fiber clamping structure provided in this embodiment further includes a shell 7, which is arranged on the back side of the frame body 2, covering and pressing the third sealing ring 8; specifically, the shell 7 has a shell optical fiber hole 71 corresponding to the optical fiber through hole for the optical fiber to pass through; the side wall of the shell 7 also has a locking hole 72, which cooperates with the card block on the side wall of the frame body 2 to fix the shell on the back side of the frame body 2 and press the third sealing ring 8.

[0056] The optical fiber clamping structure provided in this embodiment is provided with a second sealing ring at the contact portion between the base and the frame, and a third sealing ring is provided on the back side of the frame corresponding to the optical fiber through hole. The setting of the sealing ring further improves the sealing performance of the optical fiber clamping structure.

[0057] As an alternative implementation, the optical fiber clamping ring of the optical fiber clamping structure provided in this embodiment may also have a cylindrical structure with a transverse opening. Correspondingly, the pressing member also has an arm that can match the transverse opening.

[0058] Example 2

[0059] like Figure 1As shown, this embodiment provides a fiber optic sensor, including a light emitting unit, a light receiving unit, two optical fibers, and the optical fiber clamping structure described in Example 1; the two optical fibers are respectively locked by the optical fiber clamping structure and correspond to the light emitting unit and the light receiving unit.

[0060] The optical fiber sensor provided in this embodiment also includes a housing 1, within which the light emitting unit and light receiving unit are disposed. The housing 1 is enclosed by a panel. The housing 1 also includes a cable 16 for supplying power to the internal components of the housing 1. The sidewalls of the housing form the base. By providing the aforementioned optical fiber clamping structure with a sealing structure at the optical fiber clamping structure, the waterproof performance of the optical fiber sensor and the stability of the optical fiber clamping structure are improved.

[0061] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An optical fiber card connection structure, characterized in that: include: base; A frame body is firmly connected to the base, and a clamping cavity is formed between the frame body and the base; An optical fiber clamping ring is disposed in the clamping cavity, wherein the optical fiber clamping ring has at least one cylindrical structure, and a side wall of the cylindrical structure has a transverse opening; A movable member having a shaft structure, wherein the shaft structure can movably pass through the frame and extend into the clamping cavity, and a first sealing ring is provided between the shaft structure and the frame; a pressing member movably disposed between the movable member and the optical fiber clamp, wherein the pressing member is adapted to be driven by the movable member to compress the optical fiber clamp; The frame body is also provided with a frame body optical fiber hole which is in communication with the cylindrical structure.

2. The optical fiber card connection structure according to claim 1, characterized in that: The optical fiber clamp is integrally formed; wherein, two cylindrical structures are sequentially provided in the upper and lower directions, the transverse openings of the two cylindrical structures are in opposite directions, and the side wall of each opening located above extends laterally outward to form an extrusion section.

3. The optical fiber card connection structure according to claim 2, characterized in that: The front of the pressing member has a first arm and a second arm extending toward the optical fiber clamp, and the first arm and the second arm are respectively suitable for abutting against the two extrusion sections of the cylindrical structure; the back of the pressing member has an abutting surface facing the movable member and adapted to the movable member.

4. The optical fiber card connection structure according to claim 3, characterized in that: The optical fiber clamp further has a limiting structure, which is arranged on the back side of the opening of the cylindrical structure located above and extends outward; the second arm of the pressing member is also provided with a sliding groove that slidably matches the limiting structure.

5. The optical fiber card connection structure according to claim 1, characterized in that: The shaft structure is provided with an annular groove, and the first sealing ring is assembled on the annular groove.

6. The optical fiber card connection structure according to claim 1, characterized in that: It also includes a rotating lever, which is rotatably arranged above the movable member, and the rotating lever includes a wrench and a camshaft as a rotating body; the camshaft has a flat bottom groove on a side facing the wrench; The movable member further comprises an L-shaped frame, the L-shaped frame being located on the top of the shaft structure; the L-shaped frame having a bottom surface adapted to abut against the outer edge of the cam shaft, and a protrusion extending into the flat bottom groove; The rotating lever and the movable member have a first state in which they are locked together and a second state in which they are released. In the first state, the outer edge of the cam shaft abuts against the bottom surface, pressing down the movable member, thereby tightening the optical fiber clamp; In the second state, the bottom of the flat-bottomed groove abuts against the protrusion, pulling the movable member upward, thereby loosening the optical fiber clamp.

7. The optical fiber card connection structure according to claim 6, characterized in that: The outer edge of the camshaft abutting against the bottom surface has a V-shaped groove structure.

8. The optical fiber card connection structure according to claim 2, characterized in that: The base is provided with an optical fiber through hole; It also includes a second sealing ring, which is arranged at the contact portion between the base and the frame; And, a third sealing ring is arranged on the back side of the frame body, and the third sealing ring is arranged corresponding to the optical fiber through hole.

9. The optical fiber card connection structure according to claim 8, characterized in that: The back side of the frame body is provided with a sealing ring groove, and the third sealing ring is arranged in the sealing ring groove; The system further includes a shell, which is arranged on the back side of the frame, and the shell covers and presses the third sealing ring.

10. The optical fiber card connection structure according to claim 8, characterized in that: The frame body has an annular groove, and the second sealing ring is arranged in the annular groove.

11. An optical fiber sensor, characterized in that: It comprises a light emitting unit, a light receiving unit, two optical fibers, and the optical fiber clamping structure as claimed in claim 2; the two optical fibers are respectively locked by the optical fiber clamping structure and correspond to the light emitting unit and the light receiving unit.

12. The optical fiber sensor according to claim 11, wherein The device further comprises a shell, wherein the light emitting unit and the light receiving unit are arranged in the shell, and the side wall of the shell constitutes the base.

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