Detection instrument for detecting sulfide in water

Abstract

The invention relates to the technical field of detection instruments, and particularly discloses a detection instrument for detecting sulfides in water, the detection instrument comprises a quantification assembly, a mounting assembly, a moving assembly and a detection assembly, the quantification assembly is located on the left side of the mounting assembly, the moving assembly is located on the left side of the detection assembly, and the quantification assembly is located above the moving assembly; the mounting assembly is located above the detection assembly; the quantifying assembly comprises a fixing support, the mounting assembly comprises a fixing shell, a sliding groove is formed in one side of the fixing shell, and the right end of the fixing support is fixedly connected with the left end of the sliding groove. The quantifying assembly further comprises a sampling pump and a quantifying pump, the sampling pump and the quantifying pump are fixedly connected to the fixing support, and the sampling pump is located on the left side of the quantifying pump; a sampling pipeline is fixedly arranged on the sampling pump, the sampling pipeline is communicated with a sample, and a plurality of quantitative pipelines are fixedly arranged on the quantitative pump. The device can automatically move, add a reagent, rinse and wash, automatically screw a cover and move a reagent tube, and is simpler and more convenient in structure.

Description

Technical Field

[0001] The present invention relates to the technical field of detection instruments, and in particular to a detection instrument for detecting sulfide in water. Background Art

[0002] Sulfide in water can make the water smell like rotten eggs, corrosive and toxic. It is also an oxygen-consuming substance that can reduce dissolved oxygen in water and inhibit the activity of aquatic organisms. Sulfide in drinking water can easily dissipate from water into the air and produce a bad smell, and is very toxic. Sulfide can react with cytochromes and oxidases in the human body, making the enzymes inactive, affecting the cell oxidation process, causing cell tissue hypoxia, and endangering human life; hydrogen sulfide can not only corrode metals itself, but can also be oxidized into sulfuric acid by organisms in sewage, thereby corroding sewers.

[0003] There are two types of sulfide pollution sources in nature: one is natural pollution sources (volcanic eruptions, sulfur-containing mines, etc.); the other is industrial wastewater (industrial and mining enterprises containing a large amount of sulfides, such as coking, papermaking, mineral processing, printing, leather making, etc.), coal and the use of sulfur-containing substances. In order to protect the water environment, it is necessary to strengthen the detection of drinking water, surface water, and sewage discharge. The sulfides usually measured refer to water-soluble hydrogen sulfide, soluble sulfides present in suspended matter, and unionized organic sulfides.

[0004] The detection principle is: the target substance sulfide can react with a certain color developer N,N-dimethyl-p-phenylenediamine to generate a colored liquid. The same substance has different depths of color and different degrees of light absorption at different concentrations. Therefore, by detecting the degree of absorption of a substance in water to a specific wavelength of light, the concentration of the substance in the water can be determined.

[0005] The existing technology still has the following areas for improvement: existing instruments for detecting sulfide in water are usually manually operated, and sulfide itself is toxic and can produce harmful gases, posing a threat to human health. Manual operation will inevitably cause damage, and using a robot to move will cause the overall device to be too large, the structure to be too complicated, the footprint to be large, and it is more power-consuming and inconvenient. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a detection instrument for detecting sulfide in water, which can automatically move and add reagents and rinse, automatically screw on the cap and move the reagent tube, and has a simpler structure.

[0007] The purpose of the present invention can be achieved by the following technical solutions: A detection instrument for detecting sulfide in water, comprising a quantitative component, a mounting component, a moving component and a detection component, wherein the quantitative component is located on the left side of the mounting component, the moving component is located on the left side of the detection component, the quantitative component is located above the moving component, and the mounting component is located above the detection component; The quantitative component includes a fixed bracket, and the mounting component includes a fixed shell. A sliding groove is opened on one side of the fixed shell, and the right end of the fixed bracket is fixedly connected to the left end of the sliding groove.

[0008] Furthermore, the quantitative component further comprises a sampling pump and a quantitative pump, the sampling pump and the quantitative pump are both fixedly connected to the fixed bracket, and the sampling pump is located on the left side of the quantitative pump; A sampling pipeline is fixedly arranged on the sampling pump, and the sampling pipeline is connected with the sample. A plurality of quantitative pipelines are fixedly arranged on the quantitative pump, and the plurality of quantitative pipelines are respectively connected with a plurality of reagents.

[0009] Furthermore, the mounting assembly further comprises a rotating screw, a sliding block and a driving rod, one end of the rotating screw is fixedly provided with a driving motor, and the driving motor is fixedly connected to the right side of the interior of the fixed housing; The end of the rotating screw rod away from the driving motor is rotatably connected to the left side inside the fixed shell, and the sliding block is slidably connected to the rotating screw rod. The sliding block has an H-shaped structure, and the driving rod is fixedly connected to the front end of the sliding block. The groove of the sliding block is located in the sliding groove.

[0010] Furthermore, a push rod is slidably provided at the lower end of the driving rod, a rotating motor is fixedly provided at the lower end of the push rod, a fixture is fixedly provided at the lower end of the rotating motor, a mounting groove is provided at the lower end of the fixture, a suction plate is fixedly provided inside the fixture, a vacuum pump is fixedly provided outside the fixture, and the suction plate is connected to the vacuum pump through an exhaust pipe.

[0011] Furthermore, a power cord is fixedly provided on the upper end of the driving rod.

[0012] Furthermore, the moving component includes a sliding rail, a first moving block, a second moving block, a waste liquid tank and a moving tank, the first moving block and the second moving block are both slidably connected to the sliding rail, the waste liquid tank is fixedly connected to the upper end of the first moving block, a waste liquid bottle is detachably provided inside the waste liquid tank, and a first moving motor is fixedly provided on the first moving block.

[0013] Furthermore, a lower platform is fixedly provided on the upper end of the second moving block, an upper platform is fixedly provided on the lower end of the moving groove, a scissors fork is provided between the upper platform and the lower platform, the lower left end of the scissors fork is slidably provided on the lower platform, the upper left end of the scissors fork is slidably provided on the upper platform, the lower right end of the scissors fork is rotatably provided on the lower platform, and the upper right end of the scissors fork is rotatably provided on the upper platform.

[0014] Furthermore, a second moving motor is fixedly provided on the second moving block, a telescopic cylinder is rotatably provided on the upper platform, and the other end of the telescopic cylinder is rotatably connected to the scissor fork.

[0015] Furthermore, the detection component includes a detector, and a plurality of placement slots are provided on the detector. A reagent tube is provided in each of the placement slots, and a bottle cap is provided at the upper end of each reagent tube.

[0016] Furthermore, the inner diameter of the mounting groove matches the outer diameter of the bottle cap.

[0017] The beneficial effects of the present invention are: (1) By setting the mounting assembly, the technical effect that can be achieved is that a driving motor is fixedly arranged at one end of the rotating screw, the driving motor is fixedly connected to the right side of the interior of the fixed housing, the end of the rotating screw away from the driving motor is rotatably connected to the left side of the interior of the fixed housing, the sliding block is slidably connected to the rotating screw, the sliding block is in an H-shaped structure, the driving rod is fixedly connected to the front end of the sliding block, and the groove of the sliding block is located in the sliding groove; After completing the capping operation, stop rotating the motor, start the driving rod to retract the push rod upward. Since the bottle cap and the reagent tube are threadedly connected at this time, the bottle cap and the reagent tube can be driven to rise at the same time. Start the driving motor to drive the rotating screw to rotate, and the sliding block drives the driving rod to move right to the detector. The installation assembly can automatically screw the cap and move the reagent tube, which occupies a smaller area and is easier to operate. There is no need to use a robot to operate and move, thus reducing costs.

[0018] (2) By setting up the moving assembly, the technical effect that can be achieved is that the first moving block and the second moving block are both slidably connected to the sliding track, the waste liquid tank is fixedly connected to the upper end of the first moving block, a waste liquid bottle is detachably arranged inside the waste liquid tank, a first moving motor is fixedly arranged on the first moving block, a lower platform is fixedly arranged on the upper end of the second moving block, an upper platform is fixedly arranged on the lower end of the moving tank, a scissors fork is arranged between the upper platform and the lower platform, the lower left end of the scissors fork is slidably arranged on the lower platform, the upper left end of the scissors fork is slidably arranged on the upper platform, the lower right end of the scissors fork is rotatably arranged on the lower platform, and the upper right end of the scissors fork is rotatably arranged on the upper platform; The sampling pipeline is connected to the next sample, the first moving block drives the waste liquid tank to move to the lower end of the sampling pump, starts the sampling pump, and uses the next sample to rinse the sampling pump. The waste liquid after rinsing flows into the waste liquid bottle on the waste liquid tank. The moving component can automatically move the reagent tube and receive the waste liquid after rinsing, thereby improving the efficiency of adding samples and reagents. By controlling the reagent tube to move up and down, the auxiliary reagent tube moves to the detector.

[0019] (3) By setting up a quantitative component, the technical effect that can be achieved is that a sliding groove is opened on one side of the fixed shell, the right end of the fixed bracket is fixedly connected to the left end of the sliding groove, the sampling pump and the quantitative pump are both fixedly connected to the fixed bracket, the sampling pump is located on the left side of the quantitative pump, a sampling pipeline is fixedly arranged on the sampling pump, the sampling pipeline is connected to the sample, and a plurality of quantitative pipelines are fixedly arranged on the quantitative pump, and the plurality of quantitative pipelines are respectively connected to a plurality of reagents; The sampling pipeline is connected to the sample, and multiple quantitative pipelines are connected to different reagents respectively. The quantitative component can automatically add multiple reagents and samples, and automatically perform quantitative addition without manual addition operations, making quantification more accurate, improving experimental efficiency, reducing human errors, and ensuring the reliability and consistency of experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a front view of the present invention in a reagent adding state; Figure 2 It is a front view of the present invention in the state of screwing the cap; Figure 3 It is a front view of the quantitative component in the present invention; Figure 4 It is a front view of the installation assembly in the present invention; Figure 5 for Figure 4 A partial enlarged view of middle A; Figure 6 It is a left view of the sliding block in the present invention; Figure 7 It is a partial cross-sectional view of the waste liquid tank, the first moving block and the sliding track in the present invention; Figure 8 It is a partial cross-sectional view of the moving groove, the second moving block, the scissor fork and the sliding track in the present invention; Fig. 9 It is a front cross-sectional view of the scissors fork of the present invention; Fig.10 It is a top view of the detector in the present invention; Description of main component symbols: In the figure: 1. quantitative component; 11. sampling pump; 12. fixed bracket; 13. quantitative pump; 14. sampling pipeline; 15. quantitative pipeline; 2. Mounting assembly; 21. Sliding groove; 22. Fixed housing; 23. Driving motor; 24. Rotating screw; 25. Push rod; 26. Sliding block; 27. Driving rod; 28. Power cord; 29. ​​Exhaust pipe; 210. Vacuum pump; 211. Adsorption plate; 212. Fixer; 213. Rotating motor; 3. Moving assembly; 31. Sliding track; 32. First moving block; 33. Second moving block; 34. First moving motor; 35. Waste liquid tank; 36. Waste liquid bottle; 37. Second moving motor; 38. Moving tank; 39. Upper platform; 310. Telescopic cylinder; 311. Scissor fork; 312. Lower platform; 4. Detection component; 41. Detector; 42. Placement slot; 43. Bottle cap; 44. Reagent tube. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0023] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Reference Figures 1 to 10, is a detection instrument for detecting sulfide in water disclosed in the present invention, comprising a quantitative component 1, an installation component 2, a moving component 3 and a detection component 4, the quantitative component 1 is located on the left side of the installation component 2, the moving component 3 is located on the left side of the detection component 4, the quantitative component 1 is located above the moving component 3, and the installation component 2 is located above the detection component 4.

[0026] The quantitative component 1 includes a fixed bracket 12 , and the mounting component 2 includes a fixed shell 22 . A sliding groove 21 is provided on one side of the fixed shell 22 . The right end of the fixed bracket 12 is fixedly connected to the left end of the sliding groove 21 .

[0027] The quantitative component 1 further includes a sampling pump 11 and a quantitative pump 13 . The sampling pump 11 and the quantitative pump 13 are both fixedly connected to the fixed bracket 12 . The sampling pump 11 is located on the left side of the quantitative pump 13 .

[0028] A sampling pipe 14 is fixedly provided on the sampling pump 11 , and the sampling pipe 14 is connected to the sample. A plurality of quantitative pipes 15 are fixedly provided on the quantitative pump 13 , and the plurality of quantitative pipes 15 are respectively connected to a plurality of reagents.

[0029] The quantitative component 1 can automatically add a variety of reagents and samples, and automatically perform quantitative addition without manual addition operations, making the quantification more accurate, improving the efficiency of the experiment, reducing human errors, and ensuring the reliability and consistency of the experimental results.

[0030] The mounting assembly 2 further includes a rotating screw rod 24 , a sliding block 26 and a driving rod 27 . A driving motor 23 is fixedly disposed at one end of the rotating screw rod 24 . The driving motor 23 is fixedly connected to the right side of the interior of the fixed housing 22 .

[0031] One end of the rotating screw rod 24 away from the driving motor 23 is rotatably connected to the inner left side of the fixed shell 22, and the sliding block 26 is slidably connected to the rotating screw rod 24. The sliding block 26 has an H-shaped structure. The driving rod 27 is fixedly connected to the front end of the sliding block 26, and the groove of the sliding block 26 is located in the sliding groove 21.

[0032] A push rod 25 is slidably provided at the lower end of the driving rod 27, a rotating motor 213 is fixedly provided at the lower end of the pushing rod 25, a fixture 212 is fixedly provided at the lower end of the rotating motor 213, a mounting groove is provided at the lower end of the fixture 212, a suction plate 211 is fixedly provided inside the fixture 212, a vacuum pump 210 is fixedly provided outside the fixture 212, the suction plate 211 is connected to the vacuum pump 210 through an exhaust pipe 29, and a power cord 28 is fixedly provided at the upper end of the driving rod 27.

[0033] The installation assembly 2 can automatically screw on the cap and move the reagent tube 44, which occupies a smaller area and is easier to operate. It does not need to use a robot to operate and move, thus reducing costs.

[0034] The moving assembly 3 includes a sliding rail 31, a first moving block 32, a second moving block 33, a waste liquid tank 35 and a moving tank 38. The first moving block 32 and the second moving block 33 are both slidably connected to the sliding rail 31. The waste liquid tank 35 is fixedly connected to the upper end of the first moving block 32. A waste liquid bottle 36 is detachably provided inside the waste liquid tank 35. A first moving motor 34 is fixedly provided on the first moving block 32.

[0035] A lower platform 312 is fixedly provided at the upper end of the second moving block 33, an upper platform 39 is fixedly provided at the lower end of the moving groove 38, a scissors fork 311 is provided between the upper platform 39 and the lower platform 312, the lower left end of the scissors fork 311 is slidably provided on the lower platform 312, the upper left end of the scissors fork 311 is slidably provided on the upper platform 39, the lower right end of the scissors fork 311 is rotatably provided on the lower platform 312, and the upper right end of the scissors fork 311 is rotatably provided on the upper platform 39.

[0036] A second moving motor 37 is fixedly disposed on the second moving block 33 , and a telescopic cylinder 310 is rotatably disposed on the upper platform 39 . The other end of the telescopic cylinder 310 is rotatably connected to the scissor fork 311 .

[0037] The moving component 3 can automatically move the reagent tube 44 and receive the waste liquid after rinsing, thereby improving the efficiency of adding samples and reagents. By controlling the reagent tube 44 to move up and down, the reagent tube 44 is assisted to move to the detector 41.

[0038] The detection component 4 includes a detector 41, which is provided with sixteen placement slots 42, which are distributed in a matrix shape, each placement slot 42 is provided with a reagent tube 44, and each reagent tube 44 is provided with a bottle cap 43 at the upper end, and the inner diameter of the installation slot matches the outer diameter of the bottle cap 43.

[0039] The working principle and use process of the present invention are as follows: the sampling pipe 14 is connected to the sample, and the multiple quantitative pipes 15 are respectively connected to different reagents, the second moving motor 37 is started to drive the second moving block 33 to move to the bottom of the sampling pump 11, and the telescopic cylinder 310 is started to drive the upper platform 39 to rise, and the moving tank 38 rises accordingly, and the sampling pump 11 extracts a quantitative sample and adds it to the reagent tube 44 in the moving tank 38; The second moving motor 37 is started again to drive the second moving block 33 to move to the bottom of the quantitative pump 13. The quantitative pump 13 extracts different reagents and adds them to the reagent tube 44 in the moving tank 38, so that the samples in the reagent tube 44 react and become reaction liquid. Start the vacuum pump 210, the adsorption plate 211 adsorbs the bottle cap 43 in the installation groove through the exhaust pipe 29, start the driving rod 27, the push rod 25 moves downward and extends, and at the same time start the rotating motor 213 to drive the holder 212 to rotate, and the bottle cap 43 rotates while moving downward, so that the bottle cap 43 cooperates with the reagent tube 44 in the movable groove 38; After the capping operation is completed, the motor 213 is stopped, and the driving rod 27 is started to retract the push rod 25 upward. Since the bottle cap 43 and the reagent tube 44 are threadedly connected at this time, the bottle cap 43 and the reagent tube 44 can be driven to rise at the same time. At the same time, the telescopic cylinder 310 is started to drive the upper platform 39 to descend, and the moving groove 38 is lowered accordingly. The driving motor 23 is started to drive the rotating screw 24 to rotate, and the sliding block 26 drives the driving rod 27 to move right to the detector 41; The driving rod 27 is started, and the push rod 25 moves downward and extends, driving the reagent tube 44 to be placed in the placement groove 42, and then the vacuum pump 210 is turned off, and after the adsorption plate 211 stops adsorption, the push rod 25 retracts upward, completing a sample placement operation; At this time, the sampling pipe 14 is connected to the next sample, the first moving block 32 drives the waste liquid tank 35 to move to the lower end of the sampling pump 11, the sampling pump 11 is started, and the sampling pump 11 is rinsed with the next sample, and the waste liquid after rinsing flows into the waste liquid bottle 36 on the waste liquid tank 35; After rinsing is completed, the first moving block 32 drives the waste liquid tank 35 to move to the left, and the second moving block 33 drives the moving tank 38 to move to the left. The above steps are repeated until the placement tanks 42 in the detector 41 are all full, and then the detector 41 is started to detect sulfide in the water for the internal samples.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A detection instrument for detecting sulfide in water, characterized in that: The invention comprises a quantitative component (1), a mounting component (2), a moving component (3) and a detection component (4), wherein the quantitative component (1) is located on the left side of the mounting component (2), the moving component (3) is located on the left side of the detection component (4), the quantitative component (1) is located above the moving component (3), and the mounting component (2) is located above the detection component (4); The quantitative component (1) comprises a fixed bracket (12), and the mounting component (2) comprises a fixed shell (22). A sliding groove (21) is provided on one side of the fixed shell (22), and the right end of the fixed bracket (12) is fixedly connected to the left end of the sliding groove (21).

2. A detection instrument for detecting sulfide in water according to claim 1, characterized in that: The quantitative component (1) further comprises a sampling pump (11) and a quantitative pump (13), wherein the sampling pump (11) and the quantitative pump (13) are both fixedly connected to the fixed bracket (12), and the sampling pump (11) is located on the left side of the quantitative pump (13); A sampling pipe (14) is fixedly arranged on the sampling pump (11), and the sampling pipe (14) is connected to the sample. A plurality of quantitative pipes (15) are fixedly arranged on the quantitative pump (13), and the plurality of quantitative pipes (15) are respectively connected to a plurality of reagents.

3. The detection instrument for detecting sulfide in water according to claim 1, characterized in that: The mounting assembly (2) further comprises a rotating screw rod (24), a sliding block (26) and a driving rod (27); a driving motor (23) is fixedly arranged at one end of the rotating screw rod (24); and the driving motor (23) is fixedly connected to the right side inside the fixed housing (22); One end of the rotating screw rod (24) away from the driving motor (23) is rotatably connected to the left side inside the fixed housing (22); the sliding block (26) is slidably connected to the rotating screw rod (24); the sliding block (26) is in an H-shaped structure; the driving rod (27) is fixedly connected to the front end of the sliding block (26); and the groove of the sliding block (26) is located in the sliding groove (21).

4. A detection instrument for detecting sulfide in water according to claim 3, characterized in that: A push rod (25) is slidably arranged at the lower end of the driving rod (27), a rotating motor (213) is fixedly arranged at the lower end of the push rod (25), a fixture (212) is fixedly arranged at the lower end of the rotating motor (213), a mounting groove is provided at the lower end of the fixture (212), a suction plate (211) is fixedly arranged inside the fixture (212), a vacuum pump (210) is fixedly arranged outside the fixture (212), and the suction plate (211) is connected to the vacuum pump (210) through an exhaust pipe (29).

5. A detection instrument for detecting sulfide in water according to claim 4, characterized in that: A power line (28) is fixedly arranged on the upper end of the driving rod (27).

6. The detection instrument for detecting sulfide in water according to claim 1, characterized in that: The moving assembly (3) comprises a sliding track (31), a first moving block (32), a second moving block (33), a waste liquid tank (35) and a moving tank (38); the first moving block (32) and the second moving block (33) are both slidably connected to the sliding track (31); the waste liquid tank (35) is fixedly connected to the upper end of the first moving block (32); a waste liquid bottle (36) is detachably provided inside the waste liquid tank (35); and a first moving motor (34) is fixedly provided on the first moving block (32).

7. A detection instrument for detecting sulfide in water according to claim 6, characterized in that: A lower platform (312) is fixedly provided at the upper end of the second moving block (33), an upper platform (39) is fixedly provided at the lower end of the moving groove (38), a scissors fork (311) is provided between the upper platform (39) and the lower platform (312), the lower left end of the scissors fork (311) is slidably provided on the lower platform (312), the upper left end of the scissors fork (311) is slidably provided on the upper platform (39), the lower right end of the scissors fork (311) is rotatably provided on the lower platform (312), and the upper right end of the scissors fork (311) is rotatably provided on the upper platform (39).

8. The detection instrument for detecting sulfide in water according to claim 7, characterized in that: A second moving motor (37) is fixedly arranged on the second moving block (33), a telescopic cylinder (310) is rotatably arranged on the upper platform (39), and the other end of the telescopic cylinder (310) is rotatably connected to the scissor fork (311).

9. The detection instrument for detecting sulfide in water according to claim 4, characterized in that: The detection assembly (4) comprises a detector (41), wherein a plurality of placement slots (42) are provided on the detector (41), a reagent tube (44) is provided in each of the placement slots (42), and a bottle cap (43) is provided at the upper end of each reagent tube (44).

10. A detection instrument for detecting sulfide in water according to claim 9, characterized in that: The inner diameter of the mounting groove matches the outer diameter of the bottle cap (43).

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