Device for detecting low-concentration ammonia nitrogen in water

Abstract

The utility model discloses a device for detecting low-concentration ammonia nitrogen in water. The device comprises a spectrophotometer main body, a sample tank, a sample tank upper cover, a sample seat, a moving mechanism and an adjusting mechanism, the sample groove is formed in the upper end of the spectrophotometer main body; the sample groove upper cover is hinged to the upper end of the spectrophotometer main body and is used for covering the sample groove; the sample seat is arranged in the sample groove in a sliding mode, light paths used for detection are arranged on the inner walls of the two sides of the sample groove, at least three containing holes are formed in the upper end of the sample groove, the sample seat is driven to move in the sample groove through the moving mechanism, the adjusting mechanism is used for adjusting the moving mechanism, and the adjusting mechanism is arranged on the side wall of the spectrophotometer. The side wall of the spectrophotometer is provided with reference marks, the number of the reference marks is consistent with that of the placing holes, the reference marks are in one-to-one correspondence with the placing holes, and when the adjusting mechanism adjusts the moving mechanism to change the position of the sample seat, the cuvette needing to be detected can be accurately moved to a light path according to adjustment of the reference marks.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a device for detecting low-concentration ammonia nitrogen in water. Background Art

[0002] Ammonia nitrogen is one of the unconventional indicators specified in my country's "Sanitary Standard for Drinking Water" (GB 5749-2006). Its concentration limit is 0.5 mg / L, which is an important daily monitoring indicator for water treatment plants. In addition, ammonia nitrogen is also an important indicator for water environment quality monitoring. my country's "Surface Water Environmental Quality Standard" (GB 3838-2002) stipulates that the concentration limits of ammonia nitrogen in Class I and Class II surface water are 0.15 mg / L and 0.5 mg / L respectively. At present, water treatment plants and environmental monitoring departments mainly use the national standard Nessler reagent spectrophotometry (HJ535-2009) as a daily detection method for low-concentration ammonia nitrogen.

[0003] When using a spectrophotometer for detection, a detection comparison solution is required for reference, and multiple groups of test solutions also need to be detected. When using a spectrophotometer for detection, each time the sample slot cover is opened for detection, recalibration is required. Therefore, in the prior art, the comparison solution and multiple groups of test solutions are usually loaded into cuvettes and then placed on the sample seat in the sample slot at the same time to avoid opening the sample slot cover multiple times. However, there is usually only one light path in the sample slot of the spectrophotometer, and only the solution in one cuvette is detected at a time. Therefore, a pull rod is generally designed, and the handle of the pull rod is provided outside the spectrophotometer. The position of the sample seat is changed by pulling the pull rod, so that different cuvettes on the sample seat are located on the light path for detection.

[0004] However, in the prior art, due to the opacity of the sample slot and the sample slot cover, the situation inside the sample slot cannot be observed. Therefore, when the position of the sample holder is adjusted by the pull rod, deviations will occur and the cuvette to be tested cannot be moved completely and accurately to the optical path. Utility Model Content

[0005] In order to solve the above-mentioned deficiencies in the prior art, the utility model proposes a device for detecting low-concentration ammonia nitrogen in water.

[0006] In order to achieve the above technical effects, the utility model adopts the following scheme:

[0007] A low-concentration ammonia nitrogen detection device in water, comprising a spectrophotometer body, a sample slot, a sample slot upper cover, a sample holder, a moving mechanism and an adjusting mechanism;

[0008] The sample slot is provided at the upper end of the spectrophotometer body, and the sample slot upper cover is hingedly provided at the upper end of the spectrophotometer body to cover the sample slot;

[0009] The sample holder is slidably disposed in the sample slot, an optical path for detection is disposed in the sample slot, and at least three placement holes are provided at the upper end of the sample slot, and the at least three placement holes are evenly distributed along a direction perpendicular to the optical path;

[0010] The sample holder is driven to move in the sample slot by a moving mechanism, and the adjusting mechanism is used to adjust the moving mechanism. The adjusting mechanism is arranged on the side wall of the spectrophotometer. The side wall of the spectrophotometer is provided with reference marks whose number is consistent with the placement holes and corresponds one-to-one to the placement holes, and the reference marks are located on one side of the adjusting mechanism.

[0011] According to a preferred technical solution, the moving mechanism includes a screw rod, the length direction of the screw rod is parallel to the sliding direction of the sample holder, the lower end of the sample holder has a screw hole matching the screw rod, the screw rod is arranged through the screw rod, the screw rod is rotatably arranged in the spectrophotometer, and one end of the screw rod is connected to the adjustment mechanism.

[0012] A preferred technical solution is that a cavity is further provided in the main body of the spectrophotometer below the sample slot, the length of the cavity is parallel to the length direction of the sample slot and the length of the cavity is not less than the length of the sample slot, a movable driving block is provided in the cavity, two parallel strip through holes are opened at the bottom of the sample slot, the strip through holes connect the sample slot and the cavity, the strip through holes are arranged along the length of the sample slot, the lower end of the sample holder is fixedly connected to the driving block by a slider matched in the strip through holes, the screw hole is provided on the driving block, and the two ends of the screw rod are rotatably mounted on the inner wall of the cavity.

[0013] According to a preferred technical solution, a guide rail parallel to the screw rod is provided at the bottom of the cavity, and the driving block is matched and mounted on the guide rail for sliding.

[0014] According to a preferred technical solution, the adjustment mechanism comprises a rotatable knob disposed on the outer wall of the spectrophotometer body, and one end of the screw rod penetrates the side wall of the spectrophotometer body and is fixedly connected to the center of the knob.

[0015] According to a preferred technical solution, the reference mark is a reference scale line, a plurality of reference scale lines are distributed around the knob, and the knob is provided with an indicator line for pointing to the reference scale line.

[0016] Compared with the prior art, the beneficial effects are:

[0017] The utility model has a simple structure and is easy to use. By arranging a corresponding reference mark beside the adjusting mechanism, when the adjusting mechanism adjusts the moving mechanism to change the position of the sample holder, the cuvette to be detected can be accurately moved to the optical path by adjusting according to the reference mark. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view schematic diagram of the utility model;

[0019] Figure 2 It is a side cross-sectional schematic diagram of the utility model;

[0020] Figure 3 It is a schematic top view of part of the structure of the utility model.

[0021] Figure numerals: 1. spectrophotometer body; 2. sample slot cover; 3. knob; 4. reference scale line; 5. indicator line; 6. sample slot; 7. sample seat; 8. placement hole; 9. cavity; 10. strip through hole; 11. screw rod; 12. drive block; 13. slider; 14. guide rail. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] A low-concentration ammonia nitrogen detection device in water, comprising a spectrophotometer body 1, a sample tank 6, a sample tank cover 2, a sample holder 7, a moving mechanism and an adjusting mechanism;

[0024] The main body 1 of the spectrophotometer is of the prior art, and is provided with a main device required for detection inside, and operating components such as a display window and buttons are provided on the surface;

[0025] The sample slot 6 is provided at the upper end of the spectrophotometer body 1, and the sample slot upper cover 2 is hingedly provided at the upper end of the spectrophotometer body 1 to cover the sample slot 6;

[0026] The sample holder 7 is slidably disposed in the sample slot 6, and a light path for detection is disposed in the sample slot 6. The upper end of the sample slot 6 has at least three placement holes 8, and the placement holes 8 are used to place the cuvette to be tested. The at least three placement holes 8 are evenly distributed along a direction perpendicular to the light path;

[0027] The aforementioned sample slot 6, the sample slot cover 2 and the optical path all adopt the existing technology;

[0028] The sample holder 7 is driven to move in the sample slot 6 by a moving mechanism, and the moving direction of the sample holder 7 is perpendicular to the direction of the optical path. The adjusting mechanism is used to adjust the moving mechanism. The adjusting mechanism is arranged on the side wall of the spectrophotometer. The side wall of the spectrophotometer is provided with reference marks whose number is consistent with the placement holes 8 and corresponds one-to-one to the placement holes 8. The reference marks are located on one side of the adjusting mechanism. When different cuvettes are located on the optical path, the positions of the sample holder 7 correspond to different reference marks.

[0029] By arranging a corresponding reference mark beside the adjusting mechanism, when the adjusting mechanism adjusts the moving mechanism to change the position of the sample holder 7, the cuvette to be detected can be accurately moved to the optical path by adjusting according to the reference mark.

[0030] A preferred technical solution is that the moving mechanism includes a screw rod 11, the length direction of the screw rod 11 is parallel to the sliding direction of the sample holder 7, the lower end of the sample holder 7 has a screw hole matching the screw rod 11, the screw rod 11 is arranged through the screw rod 11, the screw rod 11 is rotatably arranged in the spectrophotometer, and one end of the screw rod 11 is connected to the adjustment mechanism.

[0031] The adjusting mechanism is used to adjust the rotation of the screw rod 11 , thereby driving the sample holder 7 to move and change the position of the cuvette. The movement position of the sample holder 7 can be more easily located by driving the screw rod 11 .

[0032] A preferred technical solution is that a cavity 9 located below the sample slot 6 is further provided in the spectrophotometer body 1, the length of the cavity 9 is parallel to the length direction of the sample slot 6 and the length of the cavity 9 is not less than the length of the sample slot 6, a movable driving block 12 is provided in the cavity 9, two parallel strip through holes 10 are opened at the bottom of the sample slot 6, the strip through holes 10 connect the sample slot 6 and the cavity 9, the strip through holes 10 are arranged along the length of the sample slot 6, the lower end of the sample holder 7 is fixedly connected to the driving block 12 by a slider 13 matched in the strip through hole 10, the screw hole is provided on the driving block 12, and the two ends of the screw rod 11 are rotatably mounted on the inner wall of the cavity 9.

[0033] The screw rod 11 drives the driving block 12 to move, thereby adjusting the position of the sample holder 7 . The sliding block 13 matches the strip-shaped through hole 10 , so that the sample holder 7 can move stably.

[0034] According to a preferred technical solution, a guide rail 14 parallel to the screw rod 11 is provided at the bottom of the cavity 9 , and the driving block 12 is matched and mounted on the guide rail 14 to slide.

[0035] The guide rail 14 can further improve the stability of the movement of the sample holder 7 .

[0036] According to a preferred technical solution, the adjustment mechanism comprises a rotatable knob 3 disposed on the outer wall of the spectrophotometer body 1 , and one end of the screw rod 11 penetrates the side wall of the spectrophotometer body 1 and is fixedly connected to the center of the knob 3 .

[0037] The knob 3 is mounted on the outer wall of the spectrophotometer body by conventional technology and rotated. After being connected with the screw rod 11 , rotating the knob 3 can drive the screw rod 11 to rotate, thereby adjusting the position of the sample holder 7 .

[0038] In a preferred technical solution, the reference mark is a reference scale line 4 , a plurality of reference scale lines 4 are distributed around the knob 3 , and an indication line 5 for pointing to the reference scale line 4 is provided on the knob 3 .

[0039] Each reference scale line 4 corresponds to the position of a cuvette on the sample holder 7 on the optical path. When the knob 3 is rotated, the reference indicator line 5 and the reference scale line 4 can be used to intuitively observe which cuvette is on the optical path. When the knob 3 is rotated to point the indicator line 5 to different reference scale lines 4, different cuvettes are on the optical path.

[0040] In the description of the present utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present utility model and simplifying the description, and are not references or implications that the equipment or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limitations on the present utility model.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as references or implications of relative importance or implicit indications of the number of technical features being referenced. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. A device for detecting low concentration ammonia nitrogen in water, characterized in that: It comprises a spectrophotometer body (1), a sample slot (6), a sample slot upper cover (2), a sample holder (7), a moving mechanism and an adjusting mechanism; The sample slot (6) is provided at the upper end of the spectrophotometer body (1), and the sample slot upper cover (2) is hingedly provided at the upper end of the spectrophotometer body (1) for covering the sample slot (6); The sample holder (7) is slidably arranged in the sample slot (6), an optical path for detection is arranged in the sample slot (6), and at least three placement holes (8) are provided at the upper end of the sample slot (6), and the at least three placement holes (8) are evenly distributed along a direction perpendicular to the optical path; The sample holder (7) is moved in the sample slot (6) by a moving mechanism, the adjusting mechanism is used to adjust the moving mechanism, the adjusting mechanism is arranged on the side wall of the spectrophotometer, the side wall of the spectrophotometer is provided with reference marks whose number is the same as the placement holes (8) and which correspond one to one with the placement holes (8), and the reference marks are located on one side of the adjusting mechanism.

2. A low-concentration ammonia nitrogen detection device in water as claimed in claim 1, characterized in that: The moving mechanism comprises a screw rod (11), the length direction of the screw rod (11) is parallel to the sliding direction of the sample holder (7), the lower end of the sample holder (7) has a screw hole matching the screw rod (11), the screw rod (11) is arranged through the screw rod (11), the screw rod (11) is rotatably arranged in the spectrophotometer, and one end of the screw rod (11) is connected to the adjustment mechanism.

3. A low-concentration ammonia nitrogen detection device in water as claimed in claim 2, characterized in that: The spectrophotometer body (1) is further provided with a cavity (9) located below the sample slot (6); the length of the cavity (9) is parallel to the length direction of the sample slot (6) and the length of the cavity (9) is not less than the length of the sample slot (6); a movable driving block (12) is provided in the cavity (9); two parallel strip-shaped through holes (10) are opened at the bottom of the sample slot (6); the strip-shaped through holes (10) connect the sample slot (6) and the cavity (9); the strip-shaped through holes (10) are arranged along the length of the sample slot (6); the lower end of the sample holder (7) is fixedly connected to the driving block (12) through a sliding block (13) matched with the strip-shaped through holes (10); the screw hole is arranged on the driving block (12); and the two ends of the screw rod (11) are rotatably mounted on the inner wall of the cavity (9).

4. A low-concentration ammonia nitrogen detection device in water as claimed in claim 3, characterized in that: A guide rail (14) parallel to the screw rod (11) is provided at the bottom of the cavity (9), and the driving block (12) is matched and mounted on the guide rail (14) to slide.

5. A low-concentration ammonia nitrogen detection device in water as claimed in claim 2, characterized in that: The adjustment mechanism comprises a rotatable knob (3) arranged on the outer wall of the spectrophotometer body (1), and one end of the screw rod (11) penetrates the side wall of the spectrophotometer body (1) and is fixedly connected to the center of the knob (3).

6. A device for detecting low concentration ammonia nitrogen in water as claimed in claim 5, characterized in that: The reference mark is a reference scale line (4), a plurality of reference scale lines (4) are distributed around the knob (3), and an indication line (5) for pointing to the reference scale line (4) is provided on the knob (3).

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