A multi-optical path ultra-micro detection device

Abstract

The present invention provides a multi-optical path ultra-trace detection device, comprising a first detection arm, a second detection arm, and an optical fiber head; further comprising: a mounting base having a travel groove; a positioning mechanism, comprising a positioning base slidably arranged on the mounting base through the travel groove, and a positioning rod that slides through the first detection arm and then abuts against the second detection arm, the positioning base having an inclined surface, the end of the positioning rod facing away from the second detection arm having a first state abutting against the inclined surface and a second state separated from the inclined surface, in the first state, the first detection arm, the second detection arm, the positioning base, and the positioning rod being relatively stationary, and in the second state, the positioning base slides from the lower end of the inclined surface toward the higher end thereof. The present invention solves the technical problems in the prior art of insufficiently wide concentration range and insufficiently accurate detection data.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and particularly to a multi-optical path ultra-micro detection device. Background Art

[0002] The surface tension of a trace amount of liquid is utilized to form an optical path between two optical fiber heads that are very close to each other, and the distance between the two optical fiber heads is the optical path. In order to expand the measurement range of the sample concentration, detection devices with two optical paths have been introduced on the market. These devices drive a detection arm by a motor to change the distance between the two optical fiber heads, enabling them to have two optical paths. However, the concentration range is not wide enough; at the same time, directly driving by the motor will result in inaccurate detected data.

[0003] Therefore, the Chinese utility model patent with the publication number CN202599827U proposes a three-optical path positioning device for a micro-spectrophotometer, specifically disclosing that "there is a moving part in the positioning device. The optical fiber base of the lower detection arm is fixed on the moving part and can move up and down with the moving part. The maximum moving distance is limited by the limit rods at the upper and lower ends of the positioning device. Two cams with different sizes are fixed on the motor shaft. When the motor rotates, the small cam pushes the moving part upward and downward, and the large cam pushes the moving part downward. The optical fiber base fixed on the moving part moves three times with the moving part, thereby realizing three-optical path positioning". The above device drives the optical fiber base located on the lower detection arm to move up and down through the moving part to form the adjustment and positioning of three optical paths. However, since the moving part is directly fixed on the optical fiber base, and since the optical fiber base needs to carry a trace amount of liquid, it is easy for the liquid to overflow during the up and down adjustment, resulting in inaccurate measurement accuracy. In addition, since the moving part is driven by two cams with different sizes to move, limited by the moving paths of the large and small cams, the above device can only present at most three optical paths, making the measurement (detection) range of the concentration still not wide enough. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a multi-optical path ultra-micro detection device, which solves the technical problems of insufficient concentration range and inaccurate detected data existing in the prior art.

[0005] According to an embodiment of the present invention, a multi-optical path ultra-micro detection device includes a first detection arm and a second detection arm hinged thereto, and corresponding optical fiber heads are provided on both the first detection arm and the second detection arm; it further includes:

[0006] An installation base, which is fixedly connected to the first detection arm and has a travel groove;

[0007] Positioning mechanism, the positioning mechanism includes a positioning base slidably arranged on the mounting base through the travel groove, and a positioning rod that slidably penetrates through the first detection arm and then abuts against the second detection arm. The positioning base has an inclined surface. One end of the positioning rod away from the second detection arm has a first state of abutting against the inclined surface and a second state of being separated from the inclined surface. In the first state, the first detection arm, the second detection arm, the positioning base, and the positioning rod are relatively stationary. In the second state, the positioning base slides from the low end to the high end of the inclined surface.

[0008] The technical principle of the present invention is as follows: during detection, the liquid is placed at the optical fiber head to detect its concentration; when it is necessary to adjust the concentration detection range, the positioning rod is in the second state, and then the positioning base slides a certain distance in the travel groove and then the positioning rod is in the first state.

[0009] Compared with the prior art, the present invention has the following beneficial effects: the positioning rod slidably penetrates through the first detection arm and then abuts against the second detection arm, which is used to adjust the distance between the two optical fiber heads by changing the distance between the first detection arm and the second detection arm, so as to change the optical path. There is no need to directly act on the optical fiber head, making the detection data more accurate; in addition, the positioning base has an inclined surface, and the inclined surface is used to limit the positioning rod to position the adjusted optical path, that is: the positioning rod has a first state of abutting against the inclined surface and a second state of being separated from the inclined surface. In the first state, both ends of the positioning rod can respectively abut against the inclined surface and the second detection arm, so as to obtain a specific optical path. In the second state, it is convenient for the positioning base to slide in the travel groove, so as to change the abutting position of the positioning rod and the inclined surface, and then multiple optical paths can be formed, expanding the detection range of the liquid concentration. The sliding of the inclined surface can change the distance between the first detection arm and the second detection arm (i.e., the two optical fiber heads) through the positioning rod, so that it is not limited to two or three optical paths, and at the same time it is also convenient to position the positioning rod at any position, making the measurement data more accurate.

[0010] Preferably, the inclined surface includes a plurality of sequentially connected positioning segments, and at least one group of adjacent positioning segments are connected by a first guiding segment and a second guiding segment. Both the first guiding segment and the second guiding segment are arranged obliquely in the same direction as the inclined surface, and the first guiding segment is close to the high end of the inclined surface. The first guiding segment and the second guiding segment respectively have arc-shaped first bending regions and second bending regions. The center of the first bending region is arranged away from the first detection arm, and the center of the second bending region is arranged towards the first detection arm.

[0011] Preferably, the positioning section is provided with a first threaded hole for penetrating the positioning base, and a fine-tuning screw is threaded on the first threaded hole. In the first state, the end of the positioning rod facing away from the second detection arm abuts against the fine-tuning screw.

[0012] Preferably, the positioning base is provided with an integrated guide block, the mounting base is provided with a guide groove arranged along the length direction of the travel groove, and the guide block is slidably arranged in the guide groove.

[0013] Preferably, a second threaded hole is provided on the second detection arm, and a support pin is threadedly provided on the second threaded hole and is coaxially arranged with the positioning rod. In both the first state and the second state, the positioning rod is in contact with the support pin.

[0014] Preferably, a rack arranged along the length direction of the travel groove is fixedly provided on the positioning base, and a gear matched therewith is provided on the rack, and the gear is driven by a first motor provided on the mounting base.

[0015] Preferably, an adjusting rod is rotatably provided on the mounting base, one end of the adjusting rod is hinged to the positioning rod, and when the adjusting rod rotates with the rotation point between it and the mounting base as the center, the positioning rod switches between the first state and the second state.

[0016] Preferably, a cam for driving the adjusting rod to rotate is rotatably provided on the mounting base, and the cam is driven by a second motor fixed on the mounting base.

[0017] Preferably, the adjusting rod has a relief section matched with the cam on one end away from the positioning rod.

[0018] Preferably, the mounting base is provided with a strip-shaped opening arranged along the length direction of the positioning rod, and the adjusting rod passes through the strip-shaped opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a multi-optical path ultra-micro detection device in one embodiment of the present invention;

[0020] Figure 2 for Figure 1 The schematic diagram of the structure after some installation bases are omitted;

[0021] Figure 3 for Figure 1 The schematic diagram of the structure after the first and second detection arms and part of the mounting base are omitted;

[0022] Figure 4 Schematic diagram of the structure of a positioning base in one embodiment of the present invention;

[0023] Figure 5 This is a schematic structural diagram of a positioning rod in an embodiment of the present invention.

[0024] In the figure:

[0025] 1. First detection arm; 2. Second detection arm; 3. Optical fiber head; 4. Mounting base; 41. Travel groove; 42. Guide groove; 43. Strip-shaped opening; 5. Positioning base; 51. Inclined surface; 511. Positioning section; 512. First guiding section; 513. Second guiding section; 514. First bending area; 515. Second bending area; 516. Fine adjustment screw; 6. Positioning rod; 7. Guide block; 8. Support pin; 9. Rack; 10. Gear; 11. First motor; 12. Adjusting rod; 121. Yielding section; 13. Cam; 14. Second motor. Detailed implementation manners

[0026] It should be noted that in the description of the present invention, unless otherwise clearly defined and limited, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Next, the present invention will be further described in conjunction with the attached Figures 1-5 , drawings.

[0028] A multi-optical path ultra-micro detection device includes a first detection arm 1 and a second detection arm 2 hinged thereto. Corresponding optical fiber heads 3 are provided on both the first detection arm 1 and the second detection arm 2; it further includes:

[0029] A mounting base 4, which is fixedly connected to the first detection arm 1 and has a travel groove 41;

[0030] A positioning mechanism, which includes a positioning base 5 slidably disposed on the mounting base 4 through the travel groove 41, and a positioning rod 6 that slidably penetrates through the first detection arm 1 and abuts against the second detection arm 2. The positioning base 5 has an inclined surface 51. One end of the positioning rod 6 facing away from the second detection arm 2 has a first state of abutting against the inclined surface 51 and a second state of being separated from the inclined surface 51. In the first state, the first detection arm 1, the second detection arm 2, the positioning base 5, and the positioning rod 6 are relatively stationary. In the second state, the positioning base 5 slides from the low end to the high end direction of the inclined surface 51.

[0031] In this embodiment, as shown in Figure 1 and Figure 2 , a first detection arm 1 is fixedly provided on the mounting base 4, and a second detection arm 2 is hinged on the first detection arm 1. The opening and closing of the first detection arm 1 and the second detection arm 2 are used to drop liquid on the optical fiber head 3 for detection (since the above is prior art, it will not be elaborated here). In order to expand the concentration detection range, a positioning rod 6 is slidably penetrated through the first detection arm 1. One end of the positioning rod 6 abuts against the second detection arm 2. Thus, when the positioning rod 6 slides in the first detection arm 1, the distance between the first detection arm 1 and the second detection arm 2 can be changed, so that the distance between the two optical fiber heads 3 can be changed, and then multiple optical paths can be formed. Moreover, after the positioning rod 6 passes through the first detection arm 1, it abuts against the second detection arm 2. The second detection arm 2 hinged thereon is used to expose or cover the first detection arm 1. When the positioning rod 6 slides, the optical fiber head 3 located on the first detection arm 1 will not be affected by the positioning rod 6 and shake, avoiding the situation of liquid overflow. At the same time, by sliding the positioning rod 6 to switch multiple optical paths, the detection range is expanded while reducing the impact on the detection data. On the other hand, in order to position the positioning rod 6 with the adjusted optical path, a horizontally arranged travel groove 41 is opened on the mounting base 4, and a positioning base 5 is slidably provided in the travel groove 41. Since the length of the positioning rod 6 extending between the first detection arm 1 and the second detection arm 2 is adjustable, the top of the positioning base 5 has an inclined surface 51. As shown in Figure 3 and Figure 4 , the cooperation between the inclined surface 51 and the positioning rod 6 enables the positioning rod 6 to slide or abut on the inclined surface 51, that is: one end of the positioning rod 6 away from the second detection arm 2 has a first state of abutting against the inclined surface 51 and a second state of separating from the inclined surface 51. In the first state, both ends of the positioning rod 6 abut against the second detection arm 2 and the inclined surface 51 respectively, so that the two optical fiber heads 3 can be fixed at corresponding positions for liquid detection. In the second state, one end of the positioning rod 6 abuts against the second detection arm 2, and the other end of the positioning rod 6 abuts against the inclined surface 51 (that is, the other end of the positioning rod 6 is in a suspended state), so that the positioning base 5 can slide in the travel groove 41 and abut against the other end of the positioning rod 6. The setting of the inclined surface 51 can be adapted to the positioning rod 6, so that there are several optical paths between the two optical fiber heads 3.

[0032] The inclined surface 51 includes a plurality of sequentially connected positioning segments 511. At least one set of adjacent positioning segments 511 are connected by a first guiding segment 512 and a second guiding segment 513. Both the first guiding segment 512 and the second guiding segment 513 are arranged to be inclined in the same direction as the inclined surface 51. And the first guiding segment 512 is close to the high end of the inclined surface 51. The first guiding segment 512 and the second guiding segment 513 respectively have arc-shaped first bending regions 514 and second bending regions ........

[0033] In this embodiment, in order to enable the positioning rod 6 to slide or abut on the inclined surface 51, as Figure 4 shown, the inclined surface 51 includes a plurality of sequentially connected positioning segments 511. The positioning segment 511 serves as a fixed area for one optical path. At least one set of adjacent positioning segments 511 are connected by a first guiding segment 512 and a second guiding segment 513. The first guiding segment 512 and the second guiding segment 513 are arranged to be inclined in the same direction as the positioning segment 511, so that the positioning column can quickly transition from one positioning segment 511 to another positioning segment 511, and the operation is smoother. Moreover, the first guiding segment 512 and the second guiding segment 513 respectively have a first bending region 514 and a second bending region 515. The first bending region 514 and the second bending region 515 can further make the movement of the positioning column smoother and avoid jamming.

[0034] A first threaded hole for penetrating the positioning base 5 is formed in the positioning segment 511. A fine-tuning screw 516 is screwed on the first threaded hole. In the first state, one end of the positioning rod 6 away from the second detection arm 2 abuts against the fine-tuning screw 516.

[0035] In this embodiment, in order to make the detection data more accurate, a first threaded hole for penetrating the positioning base 5 is formed in each positioning segment 511. A fine-tuning screw 516 is screwed on the first threaded hole. Thus, by screwing the fine-tuning screw 516 in or out to change the length of its extension into the first threaded hole, when the positioning rod 6 abuts on the inclined surface 51, the positioning rod 6 can extend into the first screw hole and abut against the fine-tuning screw 516. During assembly, the extension amount of the fine-tuning screw 516 is adjusted according to actual needs, so as to determine the distance between the first detection arm 1 and the second detection arm 2 when the positioning rod 6 is located in the first threaded hole, that is: which optical path it is in.

[0036] An integral guiding block 7 is provided on the positioning base 5. A guiding groove 42 arranged along the length direction of the travel groove 41 is formed in the mounting base 4. The guiding block 7 is slidably arranged in the guiding groove 42.

[0037] In this embodiment, in order to enable the positioning base 5 to slide back and forth along its preset path, an integral guiding block 7 is provided on the positioning base 5, and a guiding groove 42 is formed on the mounting base 4 and arranged along the length direction of the travel groove 41. In this way, when the positioning base 5 slides on the mounting base 4, it can drive the guiding block 7 to slide in the guiding groove 42, so as to guide the positioning base 5.

[0038] A second threaded hole is formed on the second detection arm 2, and a support pin 8 coaxial with the positioning rod 6 is screwed on the second threaded hole. In the first state and the second state, the positioning rod 6 abuts against the support pin 8.

[0039] In this embodiment, in order to enable the positioning rod 6 to abut against the second detection arm 2, a support pin 8 is provided on the second detection arm 2. The support pin 8 is used to abut against the positioning rod 6. When the positioning rod 6 slides, it will cause the second detection arm 2 to rotate on the first detection arm 1. In order to enable the positioning rod 6 to always abut against the support pin 8, one end of the support pin 8 is set as an arc structure, so as to increase the contact surface between it and the positioning rod 6 and avoid the situation of dislocation with the positioning rod 6. Furthermore, in order to finely adjust the length of the support pin 8 extending between the first detection arm 1 and the second detection arm 2, a second threaded hole is formed on the second detection arm 2, and the support pin 8 is screwed on the second detection arm 2 through the second threaded hole. During assembly, the specific optical path can be determined according to the length of the fine adjustment screw rod 516 and the support pin 8 screwed in.

[0040] A rack 9 arranged along the length direction of the travel groove 41 is fixedly provided on the positioning base 5, and a gear 10 matching with the rack 9 is provided on the rack 9. The gear 10 is driven by a first motor 11 provided on the mounting base 4.

[0041] In this embodiment, in order to enable the positioning base 5 to slide in the travel groove 41, a rack 9 sliding along the length direction of the travel groove 41 is fixedly provided on the positioning base 5. The rack 9 meshes with the gear 10, and the gear 10 is driven by a first motor 11 fixedly provided on the mounting base 4. In this way, when the positioning base 5 moves one optical path, the gear 10 rotates one circle, so that the positioning base 5 can slide more smoothly on the mounting base 4.

[0042] An adjusting rod 12 is rotatably provided on the mounting base 4. One end of the adjusting rod 12 is hinged to the positioning rod 6. When the adjusting rod 12 rotates with the rotation point of it and the mounting base 4 as the center, the positioning rod 6 is switched between the first state and the second state.

[0043] In this embodiment, in order to enable the positioning rod 6 to slide up and down in the first detection arm 1, an adjusting rod 12 is rotatably provided on the mounting base 4, and one end of the adjusting rod 12 is hinged to the positioning rod 6. When the other end of the adjusting rod 12 is pressed down or raised, the adjusting rod 12 can rotate with the rotation point between it and the mounting base 4 as the center of the circle, thereby driving the positioning rod 6 to slide up and down in the first detection arm 1, and then changing the distance between the two optical fiber heads 3; in this process, the positioning rod 6 can be switched between the first state and the second state, thereby being positioned on a certain optical path.

[0044] A cam 13 for driving the adjusting rod 12 to rotate is rotatably provided on the mounting base 4 . The cam 13 is driven by a second motor 14 fixed on the mounting base 4 .

[0045] In this embodiment, to enable the positioning rod 6 to move back and forth up and down and to position it via the inclined surface 51, the adjustment rod 12 is driven by a cam 13, which is driven by a second motor 14 fixed to the mounting base 4. Each rotation of the cam 13 results in a rotation of the gear 10, resulting in a smoother transition from one optical path to the next compared to a lead screw mechanism. Furthermore, the adjustment rod 12 has a clearance section 121 on the end away from the positioning rod 6 that is compatible with the cam 13. The clearance section 121 is compatible with the cam 13, thereby facilitating the rotation of the adjustment rod 12 on the mounting base 4 to drive the positioning rod 6 to move up and down.

[0046] The mounting base 4 is provided with a strip-shaped opening 43 arranged along the length direction of the positioning rod 6 , and the adjusting rod 12 passes through the strip-shaped opening 43 .

[0047] In this embodiment, in order to limit the adjustment rod 12, a strip-shaped opening 43 is opened on the mounting base 4, and the adjustment rod 12 is inserted into the strip-shaped opening 43 to limit the rotation path of the adjustment rod 12, so as to facilitate the positioning rod 6 to slide along the preset path.

[0048] In this embodiment, the spacing between the first detection arm 1 and the second detection arm 2 is changed by a sliding positioning rod 6, thereby changing the spacing between the two optical fiber heads 3 thereon, thereby being able to form multiple optical paths and expanding the concentration detection range; at the same time, the positioning rod 6 acts on the second detection arm 2, replacing the traditional situation where it is necessary to act on the optical fiber head 3, avoiding damage to the optical fiber head 3 and reducing liquid overflow; in addition, the positioning rod 6 is limited by a sliding inclined surface 51, so that the positioning rod 6 can stay at any position, thereby positioning the device at a certain optical path. Compared with traditional positioning devices, the structure and operation process are simpler, and the detection data is more accurate.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A multi - optical - path ultra - micro detection device, comprising a first detection arm (1) and a second detection arm (2) hinged thereto, wherein corresponding optical fiber heads (3) are provided on both the first detection arm (1) and the second detection arm (2); characterized in that, Further comprising: An installation base (4), the installation base (4) is fixedly connected to the first detection arm (1) and has a travel slot (41); A positioning mechanism, the positioning mechanism includes a positioning base (5) slidably disposed on the installation base (4) through the travel slot (41), and a positioning rod (6) that slidably penetrates through the first detection arm (1) and abuts against the second detection arm (2). The positioning base (5) has an inclined surface (51). One end of the positioning rod (6) facing away from the second detection arm (2) has a first state of abutting against the inclined surface (51) and a second state of being separated from the inclined surface (51). In the first state, the first detection arm (1), the second detection arm (2), the positioning base (5) and the positioning rod (6) are relatively stationary. In the second state, the positioning base (5) slides from the low end of the inclined surface (51) towards its high end; The inclined surface (51) includes a plurality of sequentially connected positioning segments (511). At least one group of adjacent positioning segments (511) are connected by a first guiding segment (512) and a second guiding segment (513). The first guiding segment (512) and the second guiding segment (513) are both arranged inclined in the same direction as the inclined surface (51). The first guiding segment (512) is close to the high end of the inclined surface (51). The first guiding segment (512) and the second guiding segment (513) respectively have an arc-shaped first bending region (514) and a second bending region (515). The center of the first bending region (514) is arranged away from the first detection arm (1), and the center of the second bending region (515) is arranged towards the first detection arm (1); A first threaded hole for penetrating the positioning base (5) is provided on the positioning segment (511). A fine adjustment screw (516) is threadedly installed on the first threaded hole. In the first state, one end of the positioning rod (6) facing away from the second detection arm (2) abuts against the fine adjustment screw (516); An integral guiding block (7) is provided on the positioning base (5). A guiding slot (42) arranged along the length direction of the travel slot (41) is provided on the installation base (4). The guiding block (7) is slidably disposed in the guiding slot (42).

2. The multi-optical path ultra-micro detection device according to claim 1, characterized in that, A second threaded hole is provided on the second detection arm (2). A support pin (8) arranged coaxially with the positioning rod (6) is threadedly installed on the second threaded hole. In the first state and the second state, the positioning rod (6) abuts against the support pin (8).

3. The multi-optical path ultra-trace detection device according to claim 1 or 2, characterized in that, A rack (9) arranged along the length direction of the travel slot (41) is fixedly provided on the positioning base (5). A gear (10) that mates with the rack (9) is provided on the rack (9). The gear (10) is driven by a first motor (11) provided on the installation base (4).

4. A multi-optical path ultra-trace detection device according to claim 1 or 2, characterized in that, An adjusting rod (12) is rotatably provided on the mounting base (4), one end of the adjusting rod (12) is hinged to the positioning rod (6), and when the adjusting rod (12) rotates with its rotation point with the mounting base (4) as the center, the positioning rod (6) switches between the first state and the second state.

5. The multi-optical path ultra-trace detection device according to claim 4, characterized in that, A cam (13) for driving the adjusting rod (12) to rotate is rotatably provided on the mounting base (4), and the cam (13) is driven by a second motor (14) fixed on the mounting base (4).

6. The multi - optical - path ultra - trace detection device according to claim 5, wherein, The end of the regulating rod (12) away from the positioning rod (6) has a relief section (121) adapted to the cam (13).

7. The multi-optical path ultra-micro detection device according to claim 5, characterized in that, The mounting base (4) is provided with a strip-shaped opening (43) arranged along the length direction of the positioning rod (6), and the adjusting rod (12) passes through the strip-shaped opening (43).

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