Water quality detection device and detection method thereof

Abstract

The invention discloses a water quality detection device and a detection method thereof.The water quality detection device comprises a putting unit and a detection unit, the putting unit comprises a chain plate assembly and a guide assembly, the detection unit is assembled on the chain plate assembly, the chain plate assembly is provided with a locking assembly used for vertically fixing every two chain plates, and the guide assembly is arranged on the chain plate assembly. The chain plate assembly is arranged in the guiding assembly in a guiding mode and used for enabling the chain plate piece to drive the detection unit to vertically stretch into the water surface to be detected. The device can vertically and downwards extend to a to-be-detected depth area to detect and record surrounding water pressure and temperature and then perform sampling operation, so that when a sample enters a laboratory to be detected and analyzed, the water pressure and temperature of the current sample depth position can be simulated according to detection data, and therefore the influence of the water pressure and temperature on sample detection is reduced, and the detection accuracy is improved. The accuracy of a detection result is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water quality detection, and in particular to a water quality detection device and a detection method thereof. BACKGROUND

[0002] In the fields of water resource protection, drinking water safety guarantee, industrial wastewater discharge supervision, and natural water body ecological evaluation, accurate detection of water quality parameters is a core link. The basic parameters such as dissolved oxygen content, conductivity, and pH value directly reflect the oxidation-reduction state, ion concentration level, and acid-base balance characteristics of the water body. The accuracy of the detection results has a key influence on subsequent decision-making.

[0003] At present, the mainstream water quality detection method is mainly based on "water sample collection - centralized detection in the laboratory". In this process, the detection personnel need to use a sampler to collect water samples at different depths (such as the surface layer 0.5m, the middle layer 5m, and the bottom layer 10m) of the target water body by using winches, ropes, and other equipment. Then the collected water samples are put into sealed containers, transported, and stored at a constant temperature before being sent to the laboratory. Finally, professional detection instruments such as conductivity meters are used to complete parameter detection. This traditional mode has significant defects in practical application, which is rooted in the difference in temperature and pressure conditions between the water environment and the laboratory environment. SUMMARY

[0004] The present application provides a water quality detection device and a detection method thereof to solve the problems in the prior art. The water pressure and temperature of the water at the depth position are detected and recorded to simulate the temperature and water pressure at the current sample position in the laboratory, thereby reducing the detection error.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a water quality detection device, comprising a delivery unit and a detection unit, the delivery unit comprising a chain plate assembly and a guide assembly, the detection unit being assembled and arranged on the chain plate assembly, the chain plate assembly being provided with a locking assembly for vertical fixation between two chain plates, the chain plate assembly being guided and arranged in the guide assembly to vertically extend the detection unit into the water surface to be detected, the detection unit comprising a housing and a detection instrument arranged in the housing, the housing being provided with a slot opening having a door plate, the door plate being opened when the detection unit reaches a set depth, and the detection instrument being used for water quality detection of the entering water flow.

[0006] The beneficial effects of the present application are that the water pressure and temperature around the set area are detected and recorded after reaching the set area, and then the sampling operation is performed. When the sample is detected and analyzed in the laboratory, the water pressure and temperature at the current sample depth position can be simulated according to the detection data, thereby reducing the influence of water pressure and temperature on sample detection and improving the accuracy of the detection results.

[0007] Preferably, in the above solution, the slot is a through slot, and a door plate is arranged on both sides of the slot, and the detection instrument is arranged in the slot to detect the flowing water.

[0008] Preferably, in the above solution, the detection unit further comprises a sampling device for sampling the water at the location, and the detection instrument comprises at least a temperature sensor and a water pressure sensor to determine and record the temperature and water pressure at the location, so as to simulate the recorded temperature and water pressure when the water sample is detected in detail in the laboratory later.

[0009] Preferably, in the above solution, the chain plate assembly comprises a chain plate and a counterweight, one end of the chain plate is provided with an insert, the other end is provided with a slot, the insert at one end of the chain plate is gap-fitted in the slot of the other chain plate, and the two are connected by a pin shaft.

[0010] Preferably, in the above solution, a first cavity is formed at the upper position of the slot of the chain plate, a guide groove is formed at the bottom of the first cavity and penetrates the slot, a locking hole is formed at the upper end of the insert, and the locking assembly comprises a latch that is slidingly arranged in the guide groove, and the latch is inserted downward into the locking hole to vertically lock and connect the upper and lower chain plates.

[0011] Preferably, in the above solution, the locking assembly further comprises an eccentric wheel and a connecting rod, the eccentric wheel is rotatably arranged in the first cavity, and the eccentric wheel is connected to the latch through the connecting rod, and the eccentric wheel rotates forward and backward to make the latch slide up and down through the connecting rod.

[0012] Preferably, in the above solution, the locking assembly further comprises a resilient assembly, the eccentric wheel is provided with a pressure wheel end and a lever end, a limiting slot is formed on the side surface of the first cavity, the lever end of the eccentric wheel extends outward from the limiting slot, and the resilient assembly elastically contacts the pressure wheel end of the eccentric wheel to elastically limit the pressure wheel end by the resilient assembly after the pressure wheel end passes the resilient assembly at the middle position, so that the latch is in an elastic locking state when it is extended or retracted.

[0013] Preferably, in the above solution, the guide assembly comprises a guide channel and a pushing device, the chain plate is slidingly arranged in the guide channel, and the pushing device is arranged on the channel to push the lever end of the eccentric wheel when the chain plate slides in the channel, so as to lock or unlock the locking assembly.

[0014] Preferably, two said dialing devices are symmetrically arranged on the dialing device, and are controlled to move forward and backward by electric push rods, so as to alternately enter the moving path of the dial plate end, so that when the chain plate moves downward, the locking assembly is automatically locked, and when the chain plate moves upward, the locking assembly is automatically unlocked.

[0015] A water quality detection method: S1: the chain plate assembly is lowered through the guide channel, so that the chain plate is vertically locked.

[0016] S2: the detection unit is fixedly assembled on the chain plate, and the assembly position is adjusted according to the actual detection depth.

[0017] S3: after the chain plate assembly reaches the set depth, the chain plate assembly stops downward, and the detection unit starts to detect and record the water temperature and water pressure at the current depth; S4: after the detection is completed, the sampling operation is started, and after the sampling is completed, the chain plate assembly is upwardly recycled.

[0018] The water quality detection device and the detection method provided by the application can vertically extend to the detection depth area, detect and record the surrounding water pressure and temperature, and then perform sampling operation, so that when the sample is detected and analyzed in the laboratory, the water pressure and temperature at the current sample depth position can be simulated according to the detection data, thereby reducing the influence of water pressure and temperature on sample detection and improving the accuracy of detection results. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The application is illustrated by the accompanying drawings.

[0020] Figure 2 The application is illustrated by the accompanying drawings.

[0021] Figure 3 The application is illustrated by the accompanying drawings.

[0022] Figure 4 The application is illustrated by the accompanying drawings.

[0023] Figure 5 The application is illustrated by the accompanying drawings.

[0024] Figure 6 The application is illustrated by the accompanying drawings.

[0025] Figure 7 The application is illustrated by the accompanying drawings. DETAILED DESCRIPTION

[0026] The application will be further described in detail below in combination with the accompanying drawings and specific embodiments: Embodiment

[0027] Referring to Figures 1-7 A water quality detection device, comprising a delivery unit 1 and a detection unit 2, the delivery unit 1 comprising a chain plate assembly 11, a guide assembly 12, a locking assembly 13 and a winding and releasing assembly 14, the winding and releasing assembly 14 comprising a fixed platform 141, a winding piece 142 and a power piece 143, the fixed platform 141 being provided with three support pieces 1411, the winding piece 142 being sequentially provided with a guide portion, a winding portion and an optical axis portion from left to right, wherein the guide portion is provided with a threaded guide groove 1421, the winding portion is provided with a threaded collection groove 1422, and the end face of the optical axis portion is provided with a polygonal guide hole, and a polygonal power shaft 1423 is slidingly arranged on the polygonal guide hole, the guide portion and the optical axis portion of the winding piece 142 are respectively rotatably and slidingly arranged on the two support pieces 1411, the power piece 143 is a speed reducer motor, which is fixedly arranged on the fixed platform 141, and the polygonal power shaft 1423 is arranged on the speed reducer motor, so that the rotation of the speed reducer motor drives the rotation of the polygonal power shaft 1423, thereby driving the rotation of the entire winding piece 142.

[0028] The support piece 1411 provided with the guide portion is provided with a guide piece, which is matched with the threaded guide groove 1421, so that the entire winding piece 142 rotates and moves along the threaded guide groove 1421 when rotating, and the polygonal power shaft 1423 is fixedly arranged on the power piece 143, so that the polygonal power shaft 1423 slides relative to the polygonal guide hole when the winding piece 142 rotates and moves, and the pitch of the threaded guide groove 1421 is the same as the pitch of the threaded collection groove 1422, so that the rotating and moving speed of the winding piece 142 is matched with the threaded collection groove 1422.

[0029] The guide assembly 12 comprises a guide channel piece 121 and a poking device 122, wherein the poking device 122 is arranged on the guide channel 121, the guide channel piece 121 is fixedly arranged on the fixed platform 141, and the channel groove is aligned with the threaded collection groove 1422 on the winding piece 142, wherein the threaded collection groove 1422 is used to collect and place the chain plate assembly 11.

[0030] The chain plate assembly 11 comprises chain plate pieces 111 and counterweight pieces 112, the chain plate pieces 111 are respectively provided with inserts 1111 and slots 1112 at both ends, two chain plate pieces 111 are connected by inserting the insert 1111 into the slot 1112, and the pin shaft is arranged to connect them, and the diameter of the pin shaft is smaller than the diameter of the pin hole on the insert 1111, so that the two chain plate pieces 111 are connected in a movable manner, that is, they can rotate around the pin shaft and can shake left and right along the pin shaft. The chain plate assembly 11 has multiple chain plate pieces 111 connected to each other, and the first chain plate piece 111 is provided below with a counterweight piece 112 to enable the chain plate piece 111 to automatically slide downward, and the subsequent chain plate piece 111 is arranged at the starting thread of the threaded collecting groove 1422. Because the chain plate pieces 111 can rotate around the pin shaft and can shake left and right along the axis, and the width of the threaded collecting groove 1422 is greater than the width of the chain plate piece 111, the chain plate pieces 111 connected to each other can be collected in the threaded collecting groove 1422 along the thread line of the threaded collecting groove 1422.

[0031] In the initial state, all chain plate pieces 111 are wound and collected in the threaded collecting groove 1422. When it is necessary to release the chain plate pieces 111, the winding piece 142 is rotated to make the wound and collected chain plate pieces 111 of the threaded collecting groove 1422 slide downward.

[0032] When the winding piece 142 starts to rotate and move in a threaded manner, the winding piece 142 pulls the continuous chain plate pieces 111 to be collected in the threaded collecting groove 1422, or makes the chain plate pieces 111 automatically slide downward under the action of the counterweight block 112. That is, when the winding piece 142 rotates, the chain plate pieces 111 are automatically collected or automatically slide downward in sequence.

[0033] A first cavity is formed in the upper part of the slot 1112 of the chain plate piece 111, a guide groove is formed in the bottom of the first cavity and communicates with the slot 1112, a latch piece 132 is arranged to slide in the guide groove, and a locking hole 1113 is formed in the upper end of the insert 1111. When the two chain plate pieces 111 are in a vertical state, the latch piece 132 is aligned with the locking hole 1113. The guide channel 121 is fixedly arranged on the fixed platform 141, and the guide channel 121 is perpendicular to the fixed platform 141. The fixed platform 141 is arranged horizontally on the ship, so the guide channel 121 is perpendicular to the horizontal plane. The chain plate piece 111 is arranged to slide in the guide channel 121, and the length of the guide channel 121 is greater than the length of two chain plate pieces 111, so that when the chain plate piece 111 is in the guide channel 121, the two chain plate pieces 111 are in a vertical state.

[0034] The first cavity is configured with a locking assembly 13, which includes an eccentric wheel 131, a connecting rod 134 and an elastic assembly 133. The eccentric wheel 131 is rotationally configured in the first cavity. The eccentric wheel 131 is configured with a pressing wheel end 1311 and a push plate end 1312. One end of the connecting rod 134 is rotationally configured on the side of the pressing wheel end 1311. The rotation point of the connecting rod 134 deviates from the rotation point of the eccentric wheel 131. Therefore, when the eccentric wheel 131 rotates, the connecting rod 134 drives the bolt 132 to move up and down, so that the bolt 132 enters or exits the locking hole 1113 of the lower chain plate 111.

[0035] The elastic assembly 133 includes a guide contact plate 1331 and an elastic member 1332. The guide contact plate 1331 is slidingly guided in the first cavity. The elastic member 1332 is in contact with the first cavity and the rear end surface of the guide contact plate 1331 at both ends, respectively. The front end of the guide contact plate 1331 is in elastic contact with the pressing wheel end 1311 of the eccentric wheel 131. The push plate end 1312 extends outward from the limiting slot 1114. Up and down pushing the push plate end 1312 makes the pressing wheel end 1311 move up and down. The contact surface of the pressing wheel end 1311 is a circular arc surface, and the center of the circular arc surface deviates from the rotation point of the eccentric wheel 131. Therefore, when the eccentric wheel 131 rotates, the pressing wheel end 1311 contacts the guide contact plate 1331 at different positions. When the line connecting the rotation point of the eccentric wheel 131 and the contact point of the guide contact plate 1331 is consistent with the direction of the elastic member 1332, the elastic force of the elastic member 1332 is at a maximum. After passing through this point, the elastic force of the elastic member 1332 decreases. Therefore, when the push plate end 1312 is in contact with the upper end surface of the limiting slot 1114 or the lower end surface of the limiting slot 1114, the elastic assembly 133 has an elastic locking force on the eccentric wheel 131.

[0036] The pusher 122 is configured with two groups, which are located in the slots on the side wall of the guide channel 121. The movement path of the pusher 122 is controlled by the electric telescopic rod. One group is used to push the push plate end 1312 upward when the chain plate 111 moves downward, so that the bolt 132 extends into the lower locking hole 1113. The other group is used to push the push plate end 1312 downward when the chain plate 111 moves upward, so that the bolt 132 exits the locking hole 1113.

[0037] The pusher 122 includes a base 1221 and an inclined push plate 1222 which is slidingly guided on the base 1221. The base 1221 is configured at the front end of the telescopic rod of the electric push rod. The electric push rod controls the forward and backward movement of the base 1221, thereby driving the inclined push plate 1222 to move forward and backward.

[0038] Two of the two sets of the dial device 122 are symmetrically arranged up and down, the lower inclined dial plate 1222 is inclined upward, the dial plate end 1312 of the chain plate 111 is inclined downward, and the two chain plates 111 are in an unlocked state, and the dial plate end 1312 is inclined upward, and the latch 132 is in an extended state.

[0039] Therefore, when the chain plate 111 is needed to be extended downward into the water, the power member 143 drives the winding member 142 to rotate, and the chain plate 111 moves downward along the guide channel member 121 under the action of the counterweight 112, at this time, the lower dial device 122 is extended, therefore, when the chain plate 111 passes through the inclined dial plate 1222, it is pushed upward, and the latch 132 is inserted into the locking hole 1113 of the lower chain plate 111, and then the left and right shaking between the chain plates 111 is locked by the latch 132, and after the latch 132 is inserted, the lower end is in contact with the bottom surface of the locking hole 1113, and then the upper and lower chain plates 111 are elastically compressed, the gap between the pin shaft holes of the chain plates 111 is eliminated, and the two are vertically locked, and then when the chain plate 111 is extended from below the guide channel member 121, the two chain plates 111 are vertically locked.

[0040] When the dial plate end 1312 is upward, the inclined surface of the lower inclined dial plate 1222 is in contact with the upward inclined surface of the dial plate end 1312, and then the inclined dial plate 1222 is elastically moved backward, and then the chain plate 111 automatically passes through the inclined dial plate 1222, and the inclined dial plate 1222 is popped out again, and is ready for the locking of the next chain plate 111.

[0041] The upper end surface of the insertion slot 1112 is provided with a limiting plate 1115, so that the rotation angle between the two chain plates 111 is maximum 90 degrees, that is, when the two chain plates 111 are in a vertical state, the limiting plate 1115 of the upper chain plate 111 is in contact with the lower chain plate 111, and the vertical state of the two is further ensured.

[0042] When the chain plate 111 needs to be lifted upward, the power member 143 drives the winding member 142 to reverse, and then pulls the chain plate 111 upward, at this time, the upper dial device 122 is extended, and the upper inclined dial plate 1222 is inclined downward, therefore, when the chain plate 111 moves upward, the dial plate end 1312 is flipped downward when passing through the inclined dial plate 1222, and then drives the latch 132 to automatically retract, thereby releasing the vertical locking between the upper and lower chain plates 111, and when the chain plate 111 passes through the upper part of the guide channel member 121, the vertical locking between the two chain plates 111 is contacted, and then the rotation and left and right shaking can be generated, and therefore the chain plate 111 can be collected on the winding member 142 along the threaded guide groove 1421.

[0043] The detection unit 2 comprises a housing piece 21, a sampling device 22 and a detection instrument, a connecting hole 1115 is formed in the side wall of the chain plate piece 111, and a connecting end is arranged on the housing piece 21, and the two are assembled and fixed together through thread, clamping, quick release or the like.

[0044] The length dimension is sequentially marked from the lowermost chain plate piece 111 upwards, and the operator assembles and fixed the housing piece 21 on one of the chain plate pieces 111 according to the test requirement, and the assembling is performed after the chain plate piece 111 is moved out from below the guide channel 121.

[0045] A through groove is formed in the housing piece 21, and a door piece is arranged on the front and rear end faces of the through groove, and the door piece is electrically controlled, wherein when the detection depth is reached, the operator controls the door piece to be opened, and the water flow enters the through groove, and a plurality of detection instruments are arranged in the groove, at least including a temperature sensor and a water pressure sensor, for detecting the temperature and water pressure at the depth position and recording, so as to simulate the temperature and water pressure when the sample is detected in the laboratory subsequently, and the detection instrument can further include a PH detector.

[0046] The sampling device 22 is arranged in the through groove, the sampling device 22 is a negative pressure sampling bottle, and a channel pipe 221 is connected at the bottle opening of the sampling bottle, and a switch piece is connected on the channel pipe 221, after the door piece is opened and the temperature sensor and the water pressure sensor record the values, the switch piece on the channel pipe 221 is opened again, the water sample entering the groove is negatively extracted, and the switch piece is a delay switch piece, which is automatically closed after being opened for a set time, and then the sampling is completed.

[0047] The working principle or use method is as follows: When it is necessary to detect the water quality in the water area, the ship loaded with the detection device is driven to the specific water area, at this time, the power piece 143 drives the winding piece 142 to rotate, the chain plate piece 111 is loosened, the chain plate piece 111 moves downward along the guide channel piece 121 under the action of the counterweight piece 112, at this time, the lower pushing device 122 is extended, the chain plate piece 111 is pushed upward when passing through the inclined pushing plate 1222, the latch piece 132 is inserted into the locking hole 1113 of the lower chain plate piece 111, and then the left and right shaking between the chain plate pieces 111 is locked by the latch piece 132, and the lower end of the latch piece 132 abuts against the bottom surface of the locking hole 1113 after being inserted, so as to elastically press the upper and lower chain plate pieces 111, eliminate the gap between the pin shaft holes of the chain plate pieces 111, and make the two vertically locked, so that the chain plate pieces 111 are vertically locked when extending from below the guide channel piece 121, and then the chain plate pieces 111 can be vertically entered into the water area, and the influence of the water flow on the sampling detection depth is reduced.

[0048] And in the chain plate 111 marked with length size, in need of chain plate 111 from the guide channel 121 below, press the pause button, at this time the power component 143 stop rotating, the operator will shell component 21 assembly in from the guide channel 121 below the chain plate 111, assembly is completed, again start power component 143, on the whole chain plate assembly 11 assembly multiple detection unit 2, and further can detect water quality of different depth.

[0049] After reaching the set lower depth, the power component 143 stops rotating, and the chain plate 111 in the water area is in a vertical state, at this time the door plate 21 on the shell is opened, the water flow enters the through groove, and the detection instrument detects the entering water. After the detection is completed, the sampling device is started again to sample the water sample.

[0050] After sampling, the power component 143 drives the winding component 142 to reverse, and pulls the chain plate 111 to move upwards. At this time, the upper stirring device 122 extends, and the upper inclined stirring plate 1222 is inclined downward. Therefore, when the chain plate 111 moves upwards, the stirring plate end 1312 is flipped downward when passing through the inclined stirring plate 1222, thereby driving the latch 132 to automatically retract, thereby releasing the vertical locking between the upper and lower chain plates 111. When the chain plate 111 passes above the guide channel 121, the vertical locking contact between the chain plates 111 is released, thereby enabling rotation and left-right shaking, and thus being collected on the winding component 142 along the threaded guide groove 1421.

[0051] Meanwhile, an infrared sensor is arranged below the guide channel 121. When the shell 21 is detected to approach, the power component 143 is automatically stopped. The operator removes the shell 21 from the chain plate 111, and starts the power component 143 again to wind the chain plate 111 on the threaded collection groove 1422. Embodiment

[0052] The difference between the embodiment 1 is that the locking assembly 13 is an electric telescopic rod, and the stirring device 122 is a trigger. When the chain plate 111 moves downwards and passes through the guide channel 121, the trigger sends an extension signal to the electric telescopic rod in the chain plate 111, causing the electric telescopic rod to extend downwards and insert into the lower locking hole, thereby vertically locking the upper and lower chain plates 11. When the chain plate 111 moves upwards and passes through the trigger, the electric telescopic rod is controlled to retract, thereby unlocking the upper and lower chain plates 11.

[0053] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water quality testing device, characterized in that: The device includes a delivery unit (1) and a detection unit (2). The delivery unit (1) includes a chain plate assembly (11) and a guide assembly (12). The detection unit (2) is assembled on the chain plate assembly (11). The chain plate assembly (11) is equipped with a locking assembly (13) for vertically fixing the chain plates. The chain plate assembly (11) is guided within the guide assembly (12) so that the chain plate drives the detection unit (2) to extend vertically into the water surface to be tested. The detection unit (2) includes a housing (21) and a detection instrument disposed in the housing (21). The housing (21) has a slot (211) with a door panel. When the detection unit (2) reaches a set depth, the door panel opens and the detection instrument is used to detect the water quality of the incoming water flow.

2. The water quality testing device according to claim 1, characterized in that: The slot (211) is a through-type slot, and door panels are provided on both sides of the port. The detection instrument is located in the slot (211) for detecting the flowing water.

3. A water quality testing device according to claim 1 or 2, characterized in that: The detection unit (2) also includes a sampling device (22), which is used to take samples of the water at the location. The detection instrument includes at least a temperature sensor and a water pressure sensor to determine and record the temperature and water pressure at the location, which can then be used to simulate the recorded temperature and water pressure when conducting detailed testing of the water sample in the laboratory.

4. The water quality testing device according to claim 1, characterized in that: The chain plate assembly (11) includes a chain plate component (111) and a counterweight component (112). One end of the chain plate component (111) is provided with a plug (1111) and the other end is provided with a slot (1112). The plug (1111) at one end of the chain plate component (111) is configured in a clearance fit in the slot (1112) of another chain plate component (111) and is movably connected by a pin.

5. A water quality testing device according to claim 1, characterized in that: The upper part of the slot (1112) of the chain plate (111) is provided with a first cavity, and the bottom of the first cavity is provided with a guide groove that penetrates the slot (1112). The upper end of the plug (1111) is provided with a locking hole (1113). The locking component (13) includes a pin (132) that is guided and slidably disposed in the guide groove. The pin (132) is inserted downward into the locking hole (1113) to make the upper and lower chain plates (111) vertically locked and connected.

6. A water quality testing device according to claim 5, characterized in that: The locking assembly (13) further includes an eccentric wheel (131) and a connecting rod (134). The eccentric wheel (131) is rotatably disposed in the first cavity, and the eccentric wheel (131) is connected to the pin (132) through the connecting rod (134). The eccentric wheel (131) rotates clockwise and counterclockwise, and the pin (132) slides up and down through the connecting rod (134).

7. A water quality testing device according to claim 6, characterized in that: The locking component (13) further includes an elastic component (133). The eccentric wheel (131) is provided with a pressure wheel end (1311) and a lever end (1312). A limiting slot (1114) is opened on the side of the first cavity. The lever end (1312) of the eccentric wheel (131) extends outward from the limiting slot (1114). The elastic component (133) elastically contacts the pressure wheel end (1311) of the eccentric wheel (131) so that after the pressure wheel end (1311) passes through the elastic component (133) at the middle position, the pressure wheel end (1311) is elastically limited by the elastic component (133) so that the pin (132) is in an elastically locked state when it extends or retracts.

8. A water quality testing device according to claim 7, characterized in that: The guide assembly (12) includes a guide channel (121) and a toggle device (122). The chain plate (111) is guided and slidably disposed within the guide channel (121), and the toggle device (122) is disposed on the channel (121) to aggle the toggle end (1312) on the eccentric wheel (131) when the chain plate (111) slides within the channel (121), thereby locking or unlocking the locking assembly (13).

9. A water quality testing device according to claim 8, characterized in that: Two actuating devices (122) are symmetrically arranged vertically and vertically, and their forward and backward movements are controlled by electric push rods to alternately enter the moving path of the actuating plate end (1312), so that when the chain plate (111) moves downward, the locking component (13) automatically locks, and when the chain plate (111) moves upward, the locking component (13) automatically unlocks.

10. The detection method of the water quality testing device according to claim 9, characterized in that: S1: The chain plate assembly (11) is dropped downward through the guide channel (121) so that the chain plate components (111) that have flowed out are locked vertically in pairs; S2: Fix the detection unit (2) onto the chain plate (111), and adjust the position of the assembly according to the actual detection depth requirements; S3: After the depth below the chain plate (111) of the chain plate assembly (11) reaches the set depth, the chain plate assembly (11) stops descending, and the detection unit (2) starts to detect and record the water temperature and water pressure at the current depth. S4: After the test is completed, the sampling operation will begin. After the sampling is completed, the chain plate assembly (11) will be recycled upwards.

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