Water quality detection device

Abstract

The utility model provides a water quality detection device. The water quality detection device comprises a base plate and a base vertically arranged at one end of the base plate, the air cylinder is arranged on the base plate; the detection assembly comprises a first detection piece and a second detection piece, the first detection piece is arranged on an output shaft of the air cylinder, the second detection piece is arranged on the base, a water inlet cavity is formed in the end, away from the air cylinder, of the first detection piece, and a first opening and a second opening communicating with the water inlet cavity are formed in the peripheral wall of the first detection piece; the transmission assembly is arranged on the base plate and is used for winding the test paper and enabling the test paper to transversely penetrate through the first detection piece and the second detection piece; wherein the central axis of the first opening is defined as a first connecting line, the central axis of the second opening is defined as a second connecting line, and the first connecting line and the second connecting line intersect at one point. According to the water quality detection device provided by the invention, the energy of water flow is effectively dispersed, the impact force of high-pressure water on a certain point of the test paper is reduced, and each area of the test paper can be in contact with enough water flow.

Description

Technical Field

[0001] The present application relates to the technical field of detection equipment, and in particular to a water quality detection device. Background Art

[0002] Water quality testing devices are tools used to measure and analyze water quality parameters. They can assess water purity, the amount of chemicals it contains, and other biological and physical properties. These devices play a vital role in environmental monitoring, water treatment, and scientific research. Accurate water quality testing can ensure the safe use of water resources and detect potential environmental problems in a timely manner.

[0003] In the prior art, water quality testing is often performed using two cylindrical test chambers. These chambers use the force generated by the lever handle and the spring to fix the test paper in a specific position. Once the test paper is fixed, the limit pins are used to maintain the compression state of the two test chambers, and then water is passed through for testing. In addition, the cylindrical test chamber in the prior art often only has one water inlet, and the water source to be tested is introduced from the water inlet, and the water source is made to flow through the test paper and the time for the fixed volume of water source to flow through the test paper is calculated to detect the SDI value of the water source to be tested.

[0004] However, when using a single hole to introduce high-pressure water for testing, the high-speed jet of water will sputter at a fixed point on the inner wall of the cylindrical test cavity, resulting in a relatively single distribution range of water droplets. This single-point sputtering phenomenon will cause the water droplets to be mainly concentrated in a local area of ​​the test paper, while other parts will not be fully wetted due to the lack of sufficient water coverage. As a result, some areas on the test paper may become blocked due to the accumulation of impurities in the water, affecting the smooth passage of water, that is, the water output rate is hindered. Since the uniformity of the detection reaction is seriously affected, this not only reduces the accuracy of the test, but may also lead to unreliable results of water quality assessment. Utility Model Content

[0005] In view of this, it is necessary to provide a water quality detection device that can output water evenly and ensure uniform and high-precision detection to solve the above problems.

[0006] The embodiment of the present application provides a water quality detection device, comprising:

[0007] A base plate and a base vertically arranged at one end of the base plate;

[0008] A cylinder, disposed on the base plate;

[0009] The detection assembly comprises a first detection member and a second detection member, wherein the first detection member is arranged on the output shaft of the cylinder, and the second detection member is arranged on the base, a water inlet cavity is formed at one end of the first detection member away from the cylinder, and a first opening and a second opening communicating with the water inlet cavity are formed on a peripheral wall of the first detection member;

[0010] A transmission assembly, disposed on the substrate, for winding the test paper and allowing the test paper to cross the first detection member and the second detection member;

[0011] The central axis of the first opening is defined as a first connecting line, the central axis of the second opening is defined as a second connecting line, and the first connecting line and the second connecting line intersect at a point.

[0012] In at least one embodiment of the present application, the central axis of the water inlet chamber along the vertical direction is defined as the third connecting line;

[0013] The first connecting line, the second connecting line and the third connecting line intersect at one point.

[0014] In at least one embodiment of the present application, any two of the first connection line, the second connection line, and the third connection line are vertically arranged.

[0015] In at least one embodiment of the present application, the angle between the first connecting line and the third connecting line is an obtuse angle;

[0016] The angle between the second connecting line and the third connecting line is an obtuse angle.

[0017] In at least one embodiment of the present application, the angle between the first connecting line and the second connecting line ranges from 60° to 120°.

[0018] In at least one embodiment of the present application, the angle between the first connecting line and the second connecting line is in the range of 90°.

[0019] In at least one embodiment of the present application, the second detection member is provided with a water outlet cavity arranged opposite to the water inlet cavity, for conducting out the detection water entering from the water inlet cavity.

[0020] In at least one embodiment of the present application, the water quality detection device further includes a buffer;

[0021] The buffer member is disposed on the second detection member around the water outlet cavity, and is used to fill the gap between the first detection member and the second detection member when the first detection member and the second detection member are pressed together.

[0022] In at least one embodiment of the present application, the transmission assembly includes a driving wheel, a transmission wheel, a first guide wheel and a second guide wheel disposed on the base plate;

[0023] The lower end of the hub of the first guide wheel and the upper end of the hub of the second guide wheel are located on the same plane, so that when the test paper is wound around the first guide wheel and the second guide wheel, the test paper is parallel to the end faces of the first detection member and the second detection member.

[0024] In at least one embodiment of the present application, the water quality detection device further includes a first stopper and a second stopper;

[0025] The first limiting member and the second limiting member are respectively arranged at two opposite ends of the cylinder and are used to fix the cylinder on the base plate.

[0026] The water quality detection device provided above is provided with a water inlet chamber and a first opening and a second opening connected to the water inlet chamber on the first detection member, and the central axis of the first opening is defined as a first line, and the central axis of the second opening is defined as a second line, and the first line and the second line intersect at a point. When the high-pressure water collides at the intersection point in the water inlet chamber through the first opening and the second opening, a water flow pattern that diffuses in all directions is formed. The above scheme effectively disperses the energy of the water flow, reduces the impact force of the high-pressure water directly on a certain point of the test paper, and ensures that each area of ​​the test paper can be exposed to sufficient water flow. Therefore, the moisture distribution on the test paper becomes more uniform, avoiding local over-wetting or drying, so that the reaction on the test paper is more consistent, and the error caused by uneven water flow is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of a water quality detection device in one embodiment of the present application.

[0028] Figure 2 for Figure 1 A cross-sectional view of the water quality detection device shown.

[0029] Figure 3 for Figure 1 A partial cross-sectional view of the first detection member embodiment 1 is shown.

[0030] Figure 4 for Figure 1 A partial cross-sectional view of the first detection member in the second embodiment shown

[0031] Figure 5 for Figure 1 A cross-sectional view of the first detection member is shown.

[0032] Main component symbols

[0033] 100, water quality detection device; 10, substrate; 20, base; 30, cylinder; 40, detection assembly; 41, first detection member; 41a, water inlet chamber; 41b, first opening; 41c, second opening; 42, second detection member; 42a, water outlet chamber; 50, transmission assembly; 51, driving wheel; 52, transmission wheel; 53, first guide wheel; 54, second guide wheel; 60, first limit member; 70, second limit member; L1, first connecting line; L2, second connecting line; L3, third connecting line. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be 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.

[0035] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0036] The embodiment of the present application provides a water quality detection device, comprising:

[0037] A base plate and a base vertically arranged at one end of the base plate;

[0038] A cylinder, disposed on the base plate;

[0039] The detection component comprises a first detection member and a second detection member, wherein the first detection member is arranged on the output shaft of the cylinder, and the second detection member is arranged on the base, a water inlet cavity is formed at one end of the first detection member away from the cylinder, and a first opening and a second opening communicating with the water inlet cavity are formed on a peripheral wall of the first detection member;

[0040] A transmission assembly, disposed on the substrate, for winding the test paper and allowing the test paper to cross the first detection member and the second detection member;

[0041] The central axis of the first opening is defined as a first connecting line, the central axis of the second opening is defined as a second connecting line, and the first connecting line and the second connecting line intersect at a point.

[0042] The water quality detection device provided above is provided with a water inlet chamber and a first opening and a second opening connected to the water inlet chamber on the first detection member, and the central axis of the first opening is defined as a first line, and the central axis of the second opening is defined as a second line, and the first line and the second line intersect at a point. When the high-pressure water collides at the intersection point in the water inlet chamber through the first opening and the second opening, a water flow pattern that diffuses in all directions is formed. The above scheme effectively disperses the energy of the water flow, reduces the impact force of the high-pressure water directly on a certain point of the test paper, and ensures that each area of ​​the test paper can be exposed to sufficient water flow. Therefore, the moisture distribution on the test paper becomes more uniform, avoiding local over-wetting or drying, so that the reaction on the test paper is more consistent, and the error caused by uneven water flow is reduced.

[0043] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] See also Figure 1-Figure 5 The present application provides a water quality detection device 100, comprising: a substrate 10 and a base 20 vertically arranged at one end of the substrate 10; a cylinder 30, arranged on the substrate 10; a detection assembly 40, comprising a first detection member 41 and a second detection member 42, the first detection member 41 being arranged on the output shaft of the cylinder 30, the second detection member 42 being arranged on the base 20, a water inlet chamber 41a being provided at the end of the first detection member away from the cylinder 30, and a first opening 41b and a second opening 41c being provided on the peripheral wall of the first detection member 41 which are communicated with the water inlet chamber 41a; a transmission assembly 50, arranged on the substrate 10, for winding a test paper and allowing the test paper to cross the first detection member 41 and the second detection member 42; wherein the central axis of the first opening 41b is defined as a first connecting line L1, the central axis of the second opening 41c is defined as a second connecting line L2, and the first connecting line L1 and the second connecting line L2 intersect at a point.

[0045] The water quality detection device 100 provided above is provided with a water inlet chamber 41a and a first opening 41b and a second opening 41c connected to the water inlet chamber 41a on the first detection member 41, and the central axis of the first opening 41b is defined as the first line L1, and the central axis of the second opening 41c is defined as the second line L2, and the first line L1 and the second line L2 intersect at one point. When the high-pressure water collides at the intersection point in the water inlet chamber 41a through the first opening 41b and the second opening 41c, a water flow pattern that diffuses in all directions is formed. The above scheme effectively disperses the energy of the water flow, reduces the impact force of the high-pressure water directly on a certain point of the test paper, and ensures that each area of ​​the test paper can be exposed to sufficient water flow. Therefore, the moisture distribution on the test paper becomes more uniform, avoiding local over-wetting or drying, so that the reaction on the test paper is more consistent, and the error caused by uneven water flow is reduced.

[0046] It should be noted that the base plate 10 provides a solid platform, and the base 20 is perpendicular to one end of the base plate 10, ensuring the stability and alignment accuracy of the entire device. Such a structural design helps to maintain the overall stability of the device and the accuracy of operation.

[0047] Further, the detection assembly 40 includes a first detection member 41 and a second detection member 42, which are respectively mounted on the output shaft of the cylinder 30 and the base 20. The first detection member 41 has a water inlet chamber 41a and a first opening 41b and a second opening 41c, and the design of these components is crucial for the introduction and processing of the sample. The water inlet chamber 41a allows the sample water to enter the detection member, while the opening ensures the correct guidance of the water flow and the effective implementation of the detection process.

[0048] In a specific embodiment, the first detection member 41 and the second detection member 42 are substantially cylindrical structures.

[0049] Furthermore, the transmission assembly 50 is located on the base plate 10, and is used for winding the test paper and making the test paper cross the first and second detection members 42. This design allows the test paper to effectively pass through the detection area, thereby improving the accuracy and efficiency of the detection.

[0050] In summary, the entire working process of the water quality detection device 100 is controlled by automation, and particularly relies on the cylinder 30 as the main power source. First, the device is activated, and the cylinder 30 starts to work, pushing the first detection member 41 to fit the second detection member 42 and clamping the test paper between the first detection member 41 and the second detection member 42. The water to be tested enters the water inlet chamber 41a through the first opening 41b and / or the second opening 41c of the first detection member 41, and flows through the test paper and then flows out through the second detection member 42. Thus, the SDI value of the water to be tested, that is, the silt index value (a value used to evaluate suspended impurities in water) is calculated by calculating the time when the water to be tested flows out.

[0051] It should be noted that in order to detect the time when the water to be tested flows out of the second detection member 42, a detection module (not shown) is provided at the first opening 41b, the second opening 41c and the outlet position of the second detection member 42 to calculate the time difference by recording the time when the test water enters and flows out.

[0052] Furthermore, due to the characteristics of impurities in the water to be tested, when the water to be tested flows in from the first inlet and / or the second inlet, the impurities in the water will be blocked on the test paper, thereby affecting the permeability of the water flow through the test paper. Therefore, the proportion of impurities in the water can be calculated through detection at a specific time, thereby calculating the corresponding SDI value of the water to be tested.

[0053] Furthermore, when calculating the SDI value of the water to be tested, a comprehensive calculation is performed based on the pressure, flow rate and amount of water entering. This is part of the prior art and will not be described in detail here.

[0054] Furthermore, the first opening 41b is a water inlet, and the second opening 41c can be a water inlet or a water outlet. When the amount of water to be inlet is large, the first opening 41b and the second opening 41c are respectively connected through an external water pipe. At this time, the first opening 41b and the second opening 41c are both water inlets. When the amount of water inlet is large or the water to be tested has a lot of impurities and blocks the test paper, the second opening 41c is a water outlet to guide the water overflowing from the water inlet chamber 41a. If the above-mentioned pile body appears, it can be inferred that the impurity content of the water to be tested is high, and it is inferred that the water to be tested is unqualified.

[0055] Preferably, after the water quality detection device 100 is used, some impurities may remain inside. At this time, water may be introduced into the first opening 41b to flow out from the second opening 41c, thereby cleaning the impurities inside.

[0056] See also Figure 3-Figure 5 , the central axis of the water inlet cavity 41a along the vertical direction is defined as the third line L3. The first line L1, the second line L2 and the third line L3 intersect at one point.

[0057] It should be noted that the above scheme makes the first connecting line L1, the second connecting line L2 and the third connecting line L3 intersect at one point, so that after the high-pressure water enters the water inlet chamber 41a through the first opening 41b and the second opening 41c, the two high-pressure water flows entering will collide at the intersection of the first connecting line L1, the second connecting line L2 and the third connecting line L3. The intersection point is the center point of the water inlet chamber 41a, so at the collision point of the two high-pressure water flows, the two high-pressure water flows will splash around according to the collision point. Since the collision point is the center point of the water inlet chamber 41a, the distances of the high-pressure water flows splashing to various locations on the inner wall of the water inlet chamber 41a are relatively small, so the water pressures splashing to various locations on the inner walls of the water inlet chamber 41a are relatively small, thereby avoiding the problem of uneven flow of the test paper caused by the high water pressure on a certain inner wall and splashing toward a local area.

[0058] Furthermore, the collision of two high-pressure water jets will relatively weaken each other's kinetic energy and pressure energy, and can be partially converted into heat energy of the collision, thereby avoiding the problem of high-pressure water splashing onto the test paper and damaging the test paper.

[0059] See also Figure 3 In order to facilitate the arrangement of the first detection member 41, in one embodiment, any two of the first connection line L1, the second connection line L2 and the third connection line L3 are arranged vertically. That is, the first connection line L1, the second connection line L2 and the third connection line L3 are arranged vertically to each other, so that the opening directions of the first opening 41b and the second opening 41c are opened in the horizontal direction, so as to facilitate the opening of the first opening 41b and the second opening 41c.

[0060] See also Figure 4 In order to maintain uniform pressure between the inner walls of the water inlet chamber 41a and prevent the problem that the high-pressure water is close to the test paper and directly hits the test paper, thereby damaging the test paper, due to the first opening 41b and the second opening 41c being opened relatively low, in the second embodiment, the angle between the first connecting line L1 and the third connecting line L3 is an obtuse angle, and the angle between the second connecting line L2 and the third connecting line L3 is an obtuse angle, so that the impact point of the high-pressure water introduced from the first inlet and the second inlet is lifted upward in the vertical direction, thereby increasing the distance between the impact point and the test paper, thereby avoiding the problem of damage to the test paper caused by excessive pressure on the test paper.

[0061] For further information, see Figure 3-Figure 5 In order to increase the detection area of ​​the test paper for detecting the water to be tested, in a specific embodiment, the angle between the first connecting line L1 and the second connecting line L2 ranges from 60° to 120°.

[0062] In order to verify the influence of the above angle on the water flow coverage area of ​​the test paper, a plurality of different angles of the first connecting line L1 and the second connecting line L2 are respectively prepared through simulation experiments, water flows of different pressures are introduced, and the pressure of the inner wall of the water inlet chamber 41a is detected, and the proportion of the water flow coverage area of ​​the test paper is calculated to obtain the optimal angle between the first connecting line L1 and the second connecting line L2 and the optimal pressure value introduced from the first inlet and the second inlet. The specific experimental data and experimental conditions are as follows:

[0063] Experimental conditions: using incompressible water flow, setting the first and second inlets as cylindrical openings, and using 50cm2 test paper to conduct the experiment, the following data were obtained:

[0064]

[0065]

[0066] It can be seen from the above experimental data that when the angle between the first connecting line L1 and the second connecting line L2 is between 60°-120°, the water flow coverage of the test paper reaches more than 70%, which meets the actual detection requirements. Preferably, when the angle between the first connecting line L1 and the second connecting line L2 is 90°, the water flow coverage of the test paper reaches 100%, which is the most preferred angle for this experiment.

[0067] It should be noted that the above detection method determines the water flow coverage ratio of the swab by scanning the wetness of the test paper after the experiment with a high-resolution scanner or by measuring the weight of the test paper before and after the experiment. This is part of the prior art and will not be repeated here.

[0068] In order to better discharge water, in a specific embodiment, the second detection member 42 is provided with a water outlet cavity 42a arranged opposite to the water inlet cavity 41a, for discharging the detection water entering from the water inlet cavity 41a.

[0069] It should be noted that the setting of the water outlet chamber 42a ensures that the water can flow out smoothly after passing through the test paper, avoiding the accumulation of water on the test paper, thereby reducing the physical damage or excessive chemical reaction that the water sample may cause to the test paper.

[0070] Furthermore, the water quality detection device 100 also includes a buffer; the buffer is arranged on the second detection member 42 around the water outlet cavity 42a, and is used to fill the gap between the first detection member 41 and the second detection member 42 when the first detection member 41 and the second detection member 42 are pressed together.

[0071] It should be noted that the main function of the buffer is to ensure that when the first detection member 41 and the second detection member 42 are pressed together, the detection water will not leak or overflow from between the two detection members, thereby ensuring the accuracy of the test data after the experiment.

[0072] Furthermore, the buffer provides additional sealing, reducing cross contamination or sample loss caused by gap leakage of the test water.

[0073] Furthermore, the buffer can also protect the test paper and prevent excessive pressure and physical damage to the test paper during the pressing process.

[0074] In one specific embodiment, the buffer is a sponge.

[0075] Furthermore, in order to continuously transmit the test paper, the transmission assembly 50 includes a driving wheel 51, a transmission wheel 52, a first guide wheel 53 and a second guide wheel 54 arranged on the substrate 10. The lower end of the hub of the first guide wheel 53 and the upper end of the hub of the second guide wheel 54 are located on the same plane, so that when the test paper is wound around the first guide wheel 53 and the second guide wheel 54, the test paper is parallel to the end faces of the first detection member 41 and the second detection member 42.

[0076] It should be noted that the design of the transmission assembly 50 enables the test paper to be continuously transmitted to the detection area, which facilitates continuous or batch water quality testing and improves the detection efficiency.

[0077] Furthermore, the arrangement of the first guide wheel 53 and the second guide wheel 54 ensures that the test paper remains parallel to the end faces of the first detection member 41 and the second detection member 42 when passing through the detection area. Such positioning ensures that the water flow contacts the test paper evenly, thereby ensuring the accuracy of its measurement.

[0078] Furthermore, by accurately controlling the transmission of the test paper, the amount of test paper used can be reduced, thereby reducing waste and reducing the cost of testing. In addition, the guide wheel and the transmission mechanism are integrated into a compact unit, which not only saves space but also improves the overall reliability of the device. The above scheme makes the device easy to operate, and at the same time, it becomes easier to replace the test paper or perform routine maintenance.

[0079] In order to facilitate fixing the cylinder 30 on the substrate 10, the water quality detection device 100 further includes a first stopper 60 and a second stopper 70. The first stopper 60 and the second stopper 70 are respectively disposed at opposite ends of the cylinder 30 for fixing the cylinder 30 on the substrate 10.

[0080] It should be noted that the above solution ensures that the cylinder 30 remains stable during operation by providing the first stopper 60 and the second stopper 70 at both ends of the cylinder 30, thereby reducing errors caused by vibration or movement, thereby improving the accuracy of the water measurement to be tested.

[0081] Furthermore, the design of the stopper makes the installation and maintenance of the cylinder 30 simpler and more convenient, thereby facilitating the long-term operation efficiency and accuracy of the equipment.

[0082] Furthermore, by providing two limiting members, when changes occur in the substrate 10 or the fixed environment, the two limiting members can also fix the cylinder 30 at different locations, which is convenient to use and has strong applicability.

[0083] In a specific embodiment, the stopper is a long strip-shaped stopper. Preferably, the length of the stopper is equal to the width of the cylinder 30, so that the cylinder 30 can be fixed on the base plate 10 while saving the amount of material used for the base plate 10. Preferably, the stopper is welded or screwed to the base plate 10.

[0084] The water quality detection device 100 provided above is provided with a water inlet chamber 41a and a first opening 41b and a second opening 41c connected to the water inlet chamber 41a on the first detection member 41, and the central axis of the first opening 41b is defined as the first line L1, and the central axis of the second opening 41c is defined as the second line L2, and the first line L1 and the second line L2 intersect at one point. When the high-pressure water collides at the intersection point in the water inlet chamber 41a through the first opening 41b and the second opening 41c, a water flow pattern that diffuses in all directions is formed. The above scheme effectively disperses the energy of the water flow, reduces the impact force of the high-pressure water directly on a certain point of the test paper, and ensures that each area of ​​the test paper can be exposed to sufficient water flow. Therefore, the moisture distribution on the test paper becomes more uniform, avoiding local over-wetting or drying, so that the reaction on the test paper is more consistent, and the error caused by uneven water flow is reduced.

[0085] The above is only an implementation method of the present application. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present application, but these improvements are within the scope of protection of the present application.

Claims

1. A water quality detection device, characterized in that: include: A base plate and a base vertically arranged at one end of the base plate; A cylinder, disposed on the base plate; The detection assembly comprises a first detection member and a second detection member, wherein the first detection member is arranged on the output shaft of the cylinder, and the second detection member is arranged on the base, a water inlet cavity is formed at one end of the first detection member away from the cylinder, and a first opening and a second opening communicating with the water inlet cavity are formed on a peripheral wall of the first detection member; A transmission assembly, disposed on the substrate, for winding the test paper and allowing the test paper to cross the first detection member and the second detection member; The central axis of the first opening is defined as a first connecting line, the central axis of the second opening is defined as a second connecting line, and the first connecting line and the second connecting line intersect at a point.

2. The water quality detection device according to claim 1, characterized in that: The central axis of the water inlet cavity along the vertical direction is defined as the third connecting line; The first connecting line, the second connecting line and the third connecting line intersect at one point.

3. The water quality detection device according to claim 2, characterized in that: Any two of the first connection line, the second connection line and the third connection line are arranged vertically.

4. The water quality detection device according to claim 2, characterized in that: The angle between the first connecting line and the third connecting line is an obtuse angle; The angle between the second connecting line and the third connecting line is an obtuse angle.

5. The water quality detection device according to claim 1, characterized in that: The angle between the first connecting line and the second connecting line ranges from 60° to 120°.

6. The water quality detection device according to claim 3, characterized in that: The included angle between the first connecting line and the second connecting line is 90°.

7. The water quality detection device according to claim 1, characterized in that: The second detection member is provided with a water outlet cavity which is arranged opposite to the water inlet cavity and is used for conducting out the detection water entering from the water inlet cavity.

8. The water quality detection device according to claim 7, characterized in that: The water quality detection device also includes a buffer; The buffer member is disposed on the second detection member around the water outlet cavity, and is used to fill the gap between the first detection member and the second detection member when the first detection member and the second detection member are pressed together.

9. The water quality detection device according to claim 1, characterized in that: The transmission assembly includes a driving wheel, a transmission wheel, a first guide wheel and a second guide wheel arranged on the base plate; The lower end of the hub of the first guide wheel and the upper end of the hub of the second guide wheel are located on the same plane, so that when the test paper is wound around the first guide wheel and the second guide wheel, the test paper is parallel to the end faces of the first detection member and the second detection member.

10. The water quality detection device according to claim 1, characterized in that: The water quality detection device also includes a first limiter and a second limiter; The first limiting member and the second limiting member are respectively arranged at two opposite ends of the cylinder and are used to fix the cylinder on the base plate.

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