A low-range hardness measuring instrument integrating titration and colorimetry

Abstract

This utility model belongs to the technical field of water body testing devices and discloses a low-range hardness measuring instrument integrating titration and colorimetry. It includes an instrument body and a detection groove formed on the instrument body. A first rotating rod and a second rotating rod are rotatably connected to the instrument body. A turntable is fixedly connected to the top of the first rotating rod, and multiple colorimetric cards are fixedly fixed at equal angular intervals around the turntable. A rotating plate is fixedly connected to the second rotating rod, and a burette is fixedly connected to the rotating plate. A height-adjustable lifting plate is slidably connected to the bottom of the rotating plate, and multiple stirring rods are rotatably connected to the lifting plate. This utility model drives the stirring rods to rotate through a gear transmission mechanism at the bottom of the lifting plate, simultaneously achieving mechanical stirring during the titration process. This ensures that the reaction solution is instantly mixed when reagents are added, solving the problem of traditional colorimetric reactions relying on natural diffusion and thus taking a long time.

Description

Technical Field

[0001] This utility model relates to the technical field of water body testing devices, and more specifically, to a low-range hardness measuring instrument that integrates titration and colorimetry. Background Technology

[0002] Water hardness measurement is a key indicator in environmental monitoring, industrial water treatment and other fields. It is usually detected by titration colorimetry. This method involves adding ethylenediaminetetraacetic acid (EDTA) titrant to a water sample and using the colorimetric reaction of an indicator to determine the concentration of calcium and magnesium ions. Existing detection equipment generally adopts a split design, and the reaction solution needs to be transferred to a colorimetric device for colorimetric analysis after titration.

[0003] However, after titration, the reaction needs to stand for more than 5 minutes to allow the colorimetric reaction to fully balance. This standing process is to ensure that the reactants are fully diffused and mixed. However, traditional hardness testing devices are not equipped with a stirring device and rely entirely on the natural diffusion of molecules, which results in excessively long testing times and affects testing efficiency.

[0004] In view of this, we propose a low-range hardness measuring instrument that integrates titration and colorimetry. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] The purpose of this invention is to provide a low-range hardness measuring instrument that integrates titration and colorimetry, in order to solve the problem mentioned in the background art that traditional hardness measuring instruments do not have a stirring device and therefore take a long time to perform titration and colorimetry.

[0007] 2. Technical Solution

[0008] A low-range hardness measuring instrument integrating titration and colorimetry includes an instrument body and a detection groove formed on the instrument body. A first rotating rod and a second rotating rod are rotatably connected to the instrument body. A turntable is fixedly connected to the top of the first rotating rod. Multiple colorimetric cards are fixedly fixed at equal angular intervals around the turntable. A rotating plate is fixedly connected to the second rotating rod. A burette is fixedly connected to the rotating plate. A height-adjustable lifting plate is slidably connected to the bottom of the rotating plate. Multiple stirring rods are rotatably connected to the lifting plate.

[0009] Preferably, a fixing plate is fixedly connected to the second rotating rod, and an insert rod is elastically connected to the fixing plate by a first spring. The instrument body has a first slot and a second slot with a size adapted to the insert rod. When the rotating plate moves the burette to the titration position, the insert rod is located in the first slot. When the rotating plate moves the burette to the colorimetric position, the insert rod is located in the second slot.

[0010] Preferably, the burette passes through the lifting plate, and a drive rod is fixedly connected to the lifting plate. The drive rod passes through the lifting plate and is elastically connected to the top of the lifting plate via a second spring.

[0011] Preferably, a piston with a size adapted to the inner wall surface of the burette is slidably connected inside the burette, and a pressure rod is fixedly connected to the top of the piston.

[0012] Preferably, the bottom of the lifting plate is rotatably connected to a first gear and a second gear, the first gear meshing with the second gear, the bottom of the first gear is fixedly connected to a plurality of connecting rods, the bottom of the plurality of connecting rods is fixedly connected to a rotating ring, and the rotating ring is circumferentially fixedly connected to a plurality of stirring rods.

[0013] Preferably, the top of both the first gear and the second gear is fixedly connected to a rotating ring with an inverted L-shaped cross section, and the bottom of the lifting plate is provided with a rotating groove that matches the size of the rotating ring.

[0014] Preferably, a motor is driven to the top of the lifting plate, and a follower rod is fixedly connected to the output end of the motor. The follower rod passes through the second gear, and a limit rod is fixedly connected to the second gear. A limit groove adapted to the size of the limit rod is provided on the follower rod.

[0015] 3. Beneficial effects

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. This utility model drives the stirring rod to rotate through the gear transmission mechanism at the bottom of the lifting plate, and realizes mechanical stirring simultaneously during the titration process, so that the reaction solution is mixed immediately when the reagent is added, which solves the problem that traditional colorimetric reactions rely on natural diffusion and take a long time.

[0018] 2. This utility model has a precise positioning design to prevent operational misalignment. When the rotating plate rotates to the titration or colorimetric station, the first spring pushes the insert rod to embed into the corresponding slot, ensuring that the spatial position of the burette and the colorimetric card is strictly matched, thus avoiding detection errors caused by misalignment.

[0019] 3. This utility model combines a rotary colorimetric card set with a titration module that can rotate horizontally and lift vertically, enabling a single device to simultaneously complete the entire process of titration, stirring, and colorimetry. Compared with traditional separate devices, it eliminates the reaction solution transfer step, improves efficiency, and also eliminates the risk of contamination during sample transfer. Attached Figure Description

[0020] Figure 1 This is a diagram showing the state of the burette of this invention when it is located at the colorimetric station.

[0021] Figure 2 This is a diagram showing the state of the burette of this invention when it is in the titration station.

[0022] Figure 3 This is a diagram showing the state of the present invention during stirring;

[0023] Figure 4 This is a cross-sectional schematic diagram of the lifting plate of this utility model;

[0024] Figure 5 This is a cross-sectional schematic diagram of the rotating ring of this utility model;

[0025] Figure 6 This is an exploded view of the burette of this utility model.

[0026] The following are the labels in the diagram: 1. Instrument body; 11. Detection groove; 12. First rotating rod; 13. Turntable; 14. Colorimetric card; 2. Second rotating rod; 21. Fixing plate; 22. Insert rod; 23. First spring; 24. First slot; 25. Second slot; 3. Rotating plate; 31. Lifting plate; 4. Drive rod; 5. Second spring; 6. Burette; 61. Pressure rod; 62. Piston; 7. Motor; 8. Follower rod; 81. First gear; 82. Second gear; 9. Limiting rod; 91. Limiting groove; 10. Connecting rod; 101. Rotating ring; 102. Stirring rod; 103. Rotating ring; 104. Rotating groove. Detailed Implementation

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see Figure 1-6 This utility model provides a technical solution:

[0031] A low-range hardness measuring instrument integrating titration and colorimetry includes an instrument body 1 and a detection slot 11 formed on the instrument body 1. A first rotating rod 12 and a second rotating rod 2 are rotatably connected to the instrument body 1. A turntable 13 is fixedly connected to the top of the first rotating rod 12. Multiple colorimetric cards 14 are fixedly fixed at equal angular intervals around the turntable 13. A rotating plate 3 is fixedly connected to the second rotating rod 2. A burette 6 is fixedly connected to the rotating plate 3. A height-adjustable lifting plate 31 is slidably connected to the bottom of the rotating plate 3. Multiple stirring rods 102 are rotatably connected to the lifting plate 31. With this configuration, the first rotating rod 12 drives the turntable 13 and the set of colorimetric cards 14, and the second rotating rod 2 drives the integrated titration and stirring, realizing convenient switching between titration, stirring, and colorimetry positions. This structure allows a single device to complete the entire hardness testing process simultaneously, eliminating the reaction liquid transfer step in traditional operation, eliminating the risk of sample cross-contamination, and improving testing efficiency.

[0032] Secondly, a fixing plate 21 is fixedly connected to the second rotating rod 2. A plug rod 22 is elastically connected to the fixing plate 21 via a first spring 23. The instrument body 1 has a first slot 24 and a second slot 25 with dimensions adapted to the plug rod 22. When the rotating plate 3 moves the burette 6 to the titration position, the plug rod 22 is located in the first slot 24. When the rotating plate 3 moves the burette 6 to the colorimetric position, the plug rod 22 is located in the second slot 25. Through the mechanical locking mechanism between the elastic plug rod 22 and the dual-position slot, the rotating plate 3 is accurately positioned in the titration or colorimetric position. When switching positions, the plug rod 22 can be pulled out of the slot and the second rotating rod 2 can be rotated.

[0033] Furthermore, the burette 6 is installed through the lifting plate 31. A piston 62, whose size is adapted to the inner wall surface of the burette 6, is slidably connected inside the burette 6. A pressure rod 61 is fixedly connected to the top of the piston 62. A drive rod 4 is fixedly connected to the lifting plate 31. The drive rod 4 passes through the lifting plate 31 and is elastically connected to the top of the lifting plate 31 through a second spring 5. In specific implementation, the burette 6 can be made of borosilicate glass and should be equipped with corresponding graduations to determine the titration endpoint. In addition, the rigid burette 6 can also limit the position of the lifting plate 31 to ensure that the drive rod 4 can accurately drive the lifting plate 31 to descend.

[0034] Specifically, the bottom of the lifting plate 31 is rotatably connected to a first gear 81 and a second gear 82. The first gear 81 and the second gear 82 are meshed together. The bottom of the first gear 81 is fixedly connected to a plurality of connecting rods 10. The bottom of the plurality of connecting rods 10 is fixedly connected to a rotating ring 101. The circumference of the rotating ring 101 is fixedly connected to a plurality of stirring rods 102. The top of the first gear 81 and the second gear 82 are both fixedly connected to a rotating ring 103 with an inverted L-shaped cross section. The bottom of the lifting plate 31 is provided with a rotating groove 104 that matches the size of the rotating ring 103. This arrangement allows the second gear 82 to drive the plurality of stirring rods 102 to rotate through the first gear 81 when the second gear 82 rotates.

[0035] In addition, a motor 7 is driven to the top of the lifting plate 31, and a follower rod 8 is fixedly connected to the output end of the motor 7. The follower rod 8 passes through the second gear 82, and a limit rod 9 is fixedly connected to the second gear 82. A limit groove 91 that matches the size of the limit rod 9 is provided on the follower rod 8. The setting of the limit rod 9 and the limit groove 91 allows the second gear 82 to move up and down relative to the follower rod 8 and also to rotate.

[0036] Working principle:

[0037] At the start of the operation, the operator places the water sample to be tested into the detection slot 11 of the instrument body 1, and then manually rotates the second rotating rod 2, driving the rotating plate 3 and the burette 6 fixed on it to move horizontally to the titration position. During this process, the insertion rod 22 on the fixed plate 21 is precisely inserted into the first slot 24 under the elastic force of the first spring 23, ensuring that the burette 6 is strictly aligned with the center of the detection slot 11 and avoiding manual operation deviation. Next, the lifting plate 31 is pushed vertically down by the drive rod 4, so that the burette 6 is close to the surface of the water sample, and at this time the stirring rod 102 is immersed in the liquid. Then, the operator manually presses the pressure rod 61 to push the piston 62 to add EDTA reagent to the water sample. During the titration process, the motor 7 is started to drive the follower rod 8 to rotate, and the cooperation between the limiting rod 9 and the limiting groove 91 transmits the torque to the second gear 82. The first gear 81 drives the connecting rod 10 and the rotating ring 101, causing the multiple circumferentially distributed stirring rods 102 to rotate at high speed, forming a forced vortex in the detection tank 11. This immediately promotes the mixing reaction of the reagent and the water sample, and the color reaction quickly reaches equilibrium. After the reaction is completed, the lifting plate 31 rises and resets, and the second rotating rod 2 rotates again, driving the rotating plate 3 to move to the colorimetric station. The insertion rod 22 is inserted into the second slot 25 and locked in place. At this time, the operator rotates the first rotating rod 12, so that the multiple colorimetric cards 14 on the turntable 13 are aligned with the detection tank 11 one by one. By visually comparing the color development result with the standard color scale of the colorimetric card 14, the concentration of calcium and magnesium ions is directly determined, and the hardness measurement is completed. The entire process does not require the transfer of reaction liquid. From titration and stirring to colorimetry, it is completed in one go, which significantly improves efficiency and eliminates the risk of cross-contamination.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low range hardness measurement instrument integrated with titration and colorimetry, characterized by: The instrument includes an instrument body (1) and a detection slot (11) formed on the instrument body (1). A first rotating rod (12) and a second rotating rod (2) are rotatably connected to the instrument body (1). A turntable (13) is fixedly connected to the top of the first rotating rod (12). Multiple colorimetric cards (14) are fixedly fixed at equal angular intervals around the turntable (13). A rotating plate (3) is fixedly connected to the second rotating rod (2). A burette (6) is fixedly connected to the rotating plate (3). A height-adjustable lifting plate (31) is slidably connected to the bottom of the rotating plate (3). Multiple stirring rods (102) are rotatably connected to the lifting plate (31).

2. The low range hardness measurement instrument integrated with titration and colorimetry of claim 1, wherein: A fixing plate (21) is fixedly connected to the second rotating rod (2). A plug rod (22) is elastically connected to the fixing plate (21) via a first spring (23). The instrument body (1) has a first slot (24) and a second slot (25) with dimensions adapted to the plug rod (22). When the rotating plate (3) moves the burette (6) to the titration station, the plug rod (22) is located in the first slot (24). When the rotating plate (3) moves the burette (6) to the colorimetric station, the plug rod (22) is located in the second slot (25).

3. The low range hardness measurement instrument integrated with titration and colorimetry of claim 1, wherein: The burette (6) is installed through the lifting plate (31), and a drive rod (4) is fixedly connected to the lifting plate (31). The drive rod (4) passes through the lifting plate (31) and is elastically connected to the top of the lifting plate (31) through a second spring (5).

4. The low range hardness measurement instrument integrated with titration and colorimetry of claim 1, wherein: A piston (62) with a size adapted to the inner wall surface of the burette (6) is slidably connected inside the burette (6), and a pressure rod (61) is fixedly connected to the top of the piston (62).

5. The titration colorimetric integrated low range hardness tester of claim 1, wherein: The bottom of the lifting plate (31) is rotatably connected to a first gear (81) and a second gear (82). The first gear (81) and the second gear (82) are meshed together. The bottom of the first gear (81) is fixedly connected to a plurality of connecting rods (10). The bottom of the plurality of connecting rods (10) is fixedly connected to a rotating ring (101). The rotating ring (101) is circumferentially fixedly connected to a plurality of stirring rods (102).

6. The titration colorimetric integrated low range hardness tester of claim 5, wherein: The top of the first gear (81) and the second gear (82) are both fixedly connected to a rotating ring (103) with an inverted L-shaped cross section, and the bottom of the lifting plate (31) is provided with a rotating groove (104) that matches the size of the rotating ring (103).

7. The titration colorimetric integrated low range hardness tester of claim 5, wherein: The top of the lifting plate (31) is driven by a motor (7), and the output end of the motor (7) is fixedly connected to a follower rod (8). The follower rod (8) passes through the second gear (82), and a limit rod (9) is fixedly connected to the second gear (82). A limit groove (91) adapted to the size of the limit rod (9) is provided on the follower rod (8).

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