A polluted water sampling device for water quality detection

Abstract

The present invention relates to the technical field of detection devices, and specifically to a contaminated water sampling device for water quality detection, comprising a sampling barrel, a sampling rod, a piston plate, a water collecting barrel and a locking assembly. The piston plate is arranged in the sampling barrel and can slide relative to the sampling barrel. The piston plate separates the sampling barrel into an upper chamber and a lower chamber, and a water inlet is provided on the lower chamber. The locking assembly is used to limit or allow the movement of the sampling rod, and the movement of the sampling rod can open or close the water inlet. A contaminated water sampling device for water quality detection of the present invention controls the movement of the sampling rod through the locking assembly. When sampling, the water inlet is automatically opened. After the sampling is completed, the water inlet is automatically closed, and the contaminated water sampling device for water quality detection can automatically float to the surface after sampling.

Description

Technical Field

[0001] The invention relates to the technical field of detection devices, and in particular to a polluted water body sampling device for water quality detection. Background Art

[0002] Polluted water sampling refers to the process of extracting water samples from polluted water according to prescribed methods and a certain proportion. By testing and analyzing the extracted water samples, the degree of water pollution, the types and contents of pollutants and other related water quality parameters can be determined to guide production activities and take relevant measures to reduce water pollution.

[0003] In the prior art, when sampling polluted water bodies, one sampling method is to equip the sampling barrel with a fixed-depth float. When the sampling barrel reaches a preset depth, the float is pulled up to start extraction. When in use, the sampling depth is set by the fixed-depth float to achieve sampling of polluted water bodies. However, when sampling, the sampling barrel cannot determine whether the sampling is completed. If the sampling barrel is lifted out of the water too early, the sampling barrel will still take in water during the lifting process, causing water samples at different depths to mix, which does not meet the fixed-depth sampling requirements. In addition, since sample detection requires a strong timeliness, if the sampling barrel is lifted out of the water too late, the sampling efficiency will be affected, and in severe cases, the sampling will fail. Summary of the invention

[0004] The invention provides a polluted water body sampling device for water quality detection, so as to solve the problem that the existing sampling device cannot judge whether the sampling is completed when sampling the polluted water body, thus affecting the normal sampling.

[0005] A polluted water sampling device for water quality detection of the present invention adopts the following technical scheme: a polluted water sampling device for water quality detection, comprising a sampling barrel, a sampling rod, a piston plate, a water collecting barrel and a locking assembly; the sampling barrel is arranged along a first direction, and the first direction is a vertical direction; the piston plate is arranged in the sampling barrel and can slide relative to the sampling barrel along the first direction; the piston plate divides the sampling barrel into an upper chamber and a lower chamber arranged in sequence along the first direction, the upper chamber is located above the lower chamber, the upper chamber is connected to the outside, and a water inlet is opened on the lower chamber, and the water inlet is closed in an initial state; the water collecting barrel is in the lower chamber. It is arranged along a first direction and can be extended and retracted along the first direction; and the water inlet can be connected to the water collecting cylinder; the upper and lower ends of the water collecting cylinder are respectively fixed on the piston plate and the inner bottom wall of the lower chamber, and a compression chamber is defined between the water collecting cylinder and the lower chamber, and the compression chamber is always sealed. In the initial state, the gas in the compression chamber is in a compressed state, and a space is left in the sampling cylinder to enable the piston plate to move upward; the sampling rod is arranged along the first direction and can be extended and retracted along the first direction, and the sampling rod passes through the upper chamber, the piston plate and the water collecting cylinder in sequence along the first direction and then extends from the water inlet, and the sampling rod is slidably matched with the sampling cylinder and is fixed to the piston plate. The locking assembly is installed on the sampling cylinder. The locking assembly has a locked state and an unlocked state. When in the locked state, the sampling rod is allowed to move downward and the upward movement of the sampling rod is restricted. When in the unlocked state, the sampling rod is allowed to move up and down. When the sampling rod moves up or down, the water inlet will open, so that the water collection cylinder is connected to the water inlet, and after the sampling rod moves a preset distance, the water inlet will be closed. In the initial state, the locking assembly is in a locked state.

[0006] Furthermore, the water collecting tube is a corrugated structure, so that the water collecting tube can be expanded and contracted in the first direction.

[0007] Furthermore, a sealing plate and a sealing ball are fixedly arranged on the sampling rod. The sealing ball is arranged at the lower end of the sampling rod, and the sealing plate is arranged above the sealing ball. In the initial state, the sealing ball blocks the water inlet to close the water inlet, and the distance between the sealing plate and the sealing ball in the first direction is equal to the preset distance.

[0008] Furthermore, the sampling rod includes a first rod segment and a second rod segment, the first rod segment and the second rod segment are arranged sequentially in the first direction, and the first rod segment is located above the second rod segment, and the first rod segment and the second rod segment are both fixedly connected to the piston plate; the second rod segment is a conical structure, and the diameter of its upper end is greater than the diameter of its lower end.

[0009] Furthermore, a handle is provided at the upper end of the first rod section.

[0010] Furthermore, the locking assembly includes a locking block, which is installed on the sampling barrel and can rotate relative to the sampling barrel. A slot is provided on the sampling rod. In an initial state, the locking block is inserted into the slot, and the end face of one end of the locking block inserted into the slot is a wedge-shaped surface, so that the sampling rod can move downward and limit the upward movement of the sampling rod. When the locking block rotates relative to the sampling barrel, the locking block can leave the slot and the sampling rod can move up and down.

[0011] Furthermore, the locking block is connected with a floating ball via a connecting rope, and the floating ball can float on the water surface.

[0012] Furthermore, the second rod segment is made of rubber material, so that the second rod segment can be extended and retracted in the first direction.

[0013] Furthermore, a mounting frame is fixedly arranged on the sampling tube, and the locking block is rotatably mounted on the mounting frame.

[0014] Furthermore, the piston plate and the sampling tube are slidably sealed.

[0015] The beneficial effects of the present invention are as follows: a polluted water sampling device for water quality detection of the present invention cooperates by setting a sampling tube, a sampling rod, a piston plate, a water collection tube and a locking assembly. Before sampling the polluted water, the sampling rod is manually operated to move downward in the sampling tube, and the movement of the sampling rod opens the water inlet, and the movement of the sampling rod will drive the piston plate to move synchronously, compressing the water collection tube while increasing the volume of the upper chamber and reducing the volume of the lower chamber, thereby pressurizing the gas in the compression chamber. After the sampling rod moves downward a preset distance, the water inlet will be closed. Then the sampling tube is placed in water, water enters the upper chamber of the sampling tube, and the sampling tube will descend in the water. After descending to the water layer to be sampled, the locking assembly is switched to the unlocked state. At this time, under the impetus of the air pressure inside the compression chamber, the piston plate will move upward in the sampling tube and drive the sampling rod to move upward synchronously. The movement of the sampling rod will open the water inlet, and the water sample will be sucked from the water inlet into the water collection tube. The water collection tube will also stretch with the movement of the piston plate, and after the sampling rod moves a preset distance, the water inlet will be closed to complete the sampling. The overall sampling process uses the air pressure in the compression chamber as the power, and controls the movement of the sampling rod in the first direction and the opening and closing of the water inlet through the locking assembly. When sampling, the water inlet is automatically opened, and after the sampling is completed, the water inlet is automatically closed. When the piston plate moves upward under the impetus of the air pressure inside the compression chamber to pump water, the water in the upper chamber of the sampling tube will be discharged, and the volume of the upper chamber will be reduced, thereby gradually reducing the overall gravity of the contaminated water sampling device for water quality testing, and the volume of the compression chamber will increase, thereby increasing the buoyancy of the contaminated water sampling device for water quality testing; since the locking assembly is unlocked during water pumping, after the sampling rod moves upward a preset distance to close the water inlet, the piston plate will continue to move upward under the action of the original air pressure in the compression chamber, thereby further increasing the buoyancy of the contaminated water sampling device for water quality testing, and further reducing the gravity of the contaminated water sampling device for water quality testing, until the contaminated water sampling device for water quality testing after sampling can automatically float to the surface under the action of its own buoyancy without human intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a polluted water sampling device for water quality detection of the present invention;

[0018] Figure 2A side view of the overall structure of an embodiment of a polluted water sampling device for water quality detection of the present invention;

[0019] Figure 3 for Figure 2 Sectional view along AA;

[0020] Figure 4 This is a state diagram of a sampling rod after moving in an embodiment of a polluted water sampling device for water quality detection of the present invention;

[0021] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0022] In the figure: 100, sampling tube; 110, upper chamber; 120, compression chamber; 121, water inlet; 140, mounting frame; 200, sampling rod; 201, first rod section; 202, second rod section; 203, handle; 210, blocking plate; 220, blocking ball; 300, piston plate; 400, water collecting tube; 500, locking assembly; 510, locking block; 520, connecting rope; 530, floating ball. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] An embodiment of a polluted water sampling device for water quality detection of the present invention is as follows Figures 1 to 5 shown.

[0025] A polluted water sampling device for water quality detection includes a sampling barrel 100, a sampling rod 200, a piston plate 300, a water collecting barrel 400 and a locking assembly 500. The sampling barrel 100 is arranged along a first direction, and the first direction is a vertical direction. The piston plate 300 is arranged in the sampling barrel 100, and the piston plate 300 can slide relative to the sampling barrel 100 along the first direction. The piston plate 300 and the sampling barrel 100 are slidably sealed, and the piston plate 300 separates the sampling barrel 100 into an upper chamber 110 and a lower chamber arranged in sequence along the first direction. The upper chamber 110 is located above the lower chamber, and the upper chamber 110 is connected to the outside. A water inlet 121 is opened on the lower chamber, and the water inlet 121 is closed in the initial state. Specifically, the water inlet 121 is located at the lower end of the lower chamber and is coaxially arranged with the lower chamber.

[0026] The water collecting cylinder 400 is arranged in the lower chamber along the first direction and is coaxial with the sampling cylinder 100, and the water collecting cylinder 400 can be extended and retracted in the first direction. The upper and lower ends of the water collecting cylinder 400 are respectively fixed to the piston plate 300 and the inner bottom wall of the lower chamber. A compression chamber 120 is defined between the water collecting cylinder 400 and the lower chamber. The compression chamber 120 is always sealed. In the initial state, the gas in the compression chamber 120 is in a compressed state, and a space is left in the sampling cylinder 100 to enable the piston plate 300 to move upward. The sampling rod 200 is arranged in the first direction and is coaxial with the sampling cylinder 100. The sampling rod 200 can be extended and retracted in the first direction. The sampling rod 200 passes through the upper chamber 110, the piston plate 300 and the water collecting cylinder 400 in sequence along the first direction and then extends from the water inlet 121. The sampling rod 200 is slidably matched with the sampling cylinder 100 and is fixed to the piston plate 300.

[0027] The locking assembly 500 is mounted on the sampling cylinder 100. The locking assembly 500 has a locked state and an unlocked state. In the locked state, the sampling rod 200 is allowed to move downward and is restricted from moving upward. In the unlocked state, the sampling rod 200 is allowed to move up and down. When the sampling rod 200 moves upward or downward, the water inlet 121 will open, so that the water collection cylinder 400 is connected to the water inlet 121. After the sampling rod 200 moves a preset distance, the water inlet 121 will be closed. In the initial state, the locking assembly 500 is in a locked state.

[0028] In this embodiment, a sampling cylinder 100, a sampling rod 200, a piston plate 300, a water collecting cylinder 400 and a locking assembly 500 are arranged to cooperate with each other. In the initial state, the locking assembly 500 is in a locked state, allowing the sampling rod 200 to move downward and restricting the sampling rod 200 from moving upward. At this time, the water inlet 121 is closed and is not connected to the water collecting cylinder 400.

[0029] Before sampling the polluted water, the sampling rod 200 is manually moved downward in the sampling barrel 100. The movement of the sampling rod 200 opens the water inlet 121, and the movement of the sampling rod 200 drives the piston plate 300 to move synchronously, compressing the water collecting barrel 400 while increasing the volume of the upper chamber 110 and reducing the volume of the lower chamber, thereby pressurizing the gas in the compression chamber 120. After the sampling rod 200 moves downward by a preset distance, the water inlet 121 will be closed. At this time, although the gas in the compression chamber 120 has a tendency to cause the piston plate 300 to move upward, the sampling rod 200 is locked by the locking assembly 500 and cannot move upward, so the gas in the compression chamber 120 will remain in a compressed state.

[0030] Then, the sampling tube 100 is placed in water, and water is introduced into the upper chamber 110 of the sampling tube 100, and the sampling tube 100 will descend in the water. After descending to the water layer to be sampled, the locking assembly 500 is switched to the unlocked state. At this time, under the impetus of the air pressure inside the compression chamber 120, the piston plate 300 will move upward in the sampling tube 100, and drive the sampling rod 200 to move upward synchronously. The movement of the sampling rod 200 will open the water inlet 121, and the water sample will be sucked from the water inlet 121 into the water collecting tube 400. The water collecting tube 400 will also stretch with the movement of the piston plate 300, and after the sampling rod 200 moves a preset distance, the water inlet 121 will be closed, and the sampling is completed. During the sampling process, the air pressure in the compression chamber 120 is used as the power, and the locking assembly 500 is used to control the movement of the sampling rod 200 in the first direction and the opening and closing of the water inlet 121. When sampling, the water inlet 121 is automatically opened, and after the sampling is completed, the water inlet 121 will automatically close.

[0031] And when the piston plate 300 moves upward to pump water under the impetus of the air pressure inside the compression chamber 120, the water in the upper chamber 110 of the sampling tube 100 will be discharged, and the volume of the upper chamber 110 will be reduced, thereby gradually reducing the overall gravity of the contaminated water sampling device for water quality testing, and the volume of the compression chamber 120 will increase, thereby increasing the buoyancy of the contaminated water sampling device for water quality testing. In this process, the gravity of the contaminated water sampling device for water quality testing is equal to its buoyancy, thereby enabling the contaminated water sampling device for water quality testing to remain in the water layer to be sampled for sampling. And because the locking assembly 500 is in an unlocked state when pumping water, after the sampling rod 200 moves upward a preset distance to close the water inlet 121, the piston plate 300 will continue to move upward under the action of the original air pressure in the compression chamber 120, thereby further increasing the buoyancy of the contaminated water sampling device for water quality testing, and further reducing the gravity of the contaminated water sampling device for water quality testing, until the contaminated water sampling device for water quality testing after sampling can automatically float to the surface under the action of its own buoyancy without the need for human intervention.

[0032] In this embodiment, the water collecting tube 400 is a corrugated structure, so that the water collecting tube 400 can be expanded and contracted in a first direction.

[0033] In this embodiment, a sealing plate 210 and a sealing ball 220 are fixedly provided on the sampling rod 200. The sealing ball 220 is provided at the lower end of the sampling rod 200, and the sealing plate 210 is provided above the sealing ball 220. In the initial state, the sealing ball 220 blocks the water inlet 121 to close the water inlet 121, and the distance between the sealing plate 210 and the sealing ball 220 in the first direction is equal to the preset distance.

[0034] By setting the blocking plate 210 and the blocking ball 220, see the attached Figure 3As shown, in the initial state, the blocking ball 220 blocks the water inlet 121, so that the water inlet 121 is closed. When the sampling rod 200 moves downward, the blocking ball 220 will move away from the water inlet 121 synchronously with the sampling rod 200, so that the water inlet 121 is opened. After the sampling rod 200 moves downward a preset distance, the blocking plate 210 can block the water inlet 121, so that the water inlet 121 is closed. That is, the sampling rod 200 moves downward from the surrounding Figure 3 The status shown moves to the Figure 4 Status shown.

[0035] Similarly, when the sampling rod 200 is Figure 4 When the sampling rod 200 moves upward, the blocking plate 210 will move away from the water inlet 121 synchronously with the sampling rod 200, so that the water inlet 121 is opened. After the sampling rod 200 moves upward a preset distance, the blocking ball 220 blocks the water inlet 121, so that the water inlet 121 is closed. Figure 4 The status shown moves to the Figure 3 Status shown.

[0036] In this embodiment, the sampling rod 200 includes a first rod segment 201 and a second rod segment 202, which are arranged in sequence in the first direction, and the first rod segment 201 is located above the second rod segment 202, and the first rod segment 201 and the second rod segment 202 are both fixed to the piston plate 300. The blocking ball 220 and the blocking plate 210 are both arranged on the second rod segment 202, and the second rod segment 202 is a conical structure, and the diameter of the upper end thereof is greater than the diameter of the lower end.

[0037] Furthermore, a handle 203 is provided at the upper end of the first rod section 201. When in use, the operator can use the handle 203 to move the first rod section 201, thereby driving the second rod section 202 to move, and can use the handle 203 to put the sampling tube 100 into the water and take the sampling tube 100 out of the water.

[0038] In this embodiment, a first rod section 201 and a second rod section 202 are provided to form a sampling rod 200. Figure 3 As shown, in the initial state, the blocking ball 220 blocks the water inlet 121, and the lower end of the second rod segment 202 is close to one side of the water inlet 121. When the sampling rod 200 moves downward by a preset distance, the blocking plate 210 can block the water inlet 121, and the second rod segment 202 moves downward along the first direction, so that the upper end of the second rod segment 202 is close to the water inlet 121. Figure 4As shown, in the subsequent process of pumping water, the sampling rod 200 will move upward by a preset distance. During the movement, the lower end of the second rod section 202 gradually approaches the side of the water inlet 121, so that the space between the water inlet 121 and the sampling rod 200 is continuously increased with the movement of the sampling rod 200, which can prevent the water inlet 121 from being blocked during the sampling process, so that the water sample can smoothly enter the water collection cylinder 400. And during sampling, as the piston plate 300 moves upward, the air pressure in the compression chamber 120 will gradually recover, and the upward movement speed of the piston plate 300 will gradually decrease. Therefore, during sampling, the space between the water inlet 121 and the second rod section 202 is continuously enlarged, and the speed of water inlet can be increased, so that the speed of water inlet and the air pressure in the compression chamber 120 complement each other, so that sampling can be carried out normally.

[0039] In this embodiment, the locking assembly 500 includes a locking block 510, which is installed on the sampling barrel 100 and can rotate relative to the sampling barrel 100. A slot is provided on the first rod segment 201 of the sampling rod 200. In the initial state, the locking block 510 is inserted into the slot, and the end surface of the locking block 510 that is inserted into the slot is a wedge-shaped surface, so that the sampling rod 200 can move downward and limit the upward movement of the sampling rod 200. At this time, the locking assembly 500 is in a locked state, and when the locking block 510 rotates relative to the sampling barrel 100, the locking block 510 can leave the slot, and the sampling rod 200 can move up and down. At this time, the locking assembly 500 is in an unlocked state.

[0040] Specifically, two slots are provided, and the two slots are arranged in sequence along the first direction on the first rod segment 201. The two slots are respectively called the first slot and the second slot. The first slot is located on the side of the second slot in the first direction close to the blocking ball 220. In the initial state, the locking block 510 is inserted into the first slot, and the distance between the first slot and the second slot in the first direction is equal to the preset distance, so that when the sampling rod 200 moves downward to the blocking plate 210 to block the water inlet 121, the locking block 510 can be inserted into the second slot.

[0041] In this embodiment, the second rod segment 202 is made of rubber material, so that the second rod segment 202 can be extended and retracted in the first direction.

[0042] In this embodiment, a locking block 510 is provided. When the locking block 510 is inserted into the slot, the sampling rod 200 can only move downward but cannot move upward.

[0043] Specifically, the mounting frame 140 is fixedly disposed on the sampling tube 100, the locking block 510 is a Z-shaped structure, and the middle part of the locking block 510 is rotatably mounted on the mounting frame 140. The first rod section 201 is slidably matched with the mounting frame 140.

[0044] See attached Figure 4 and attached Figure 5As shown, when it is necessary to unlock the locking block 510 from the slot, pull the end of the locking block 510 that is not connected to the slot and rotate it upward. At this time, the end of the locking block 510 that is connected to the slot will rotate downward, and force the first rod segment 201 downward through its wedge surface, and drive the piston plate 300 downward through the first rod segment 201. Since the blocking plate 210 limits the downward movement of the second rod segment 202, the downward movement of the piston plate 300 will compress the second rod segment 202 for a certain distance.

[0045] Furthermore, the surface of the first rod segment 201 is rough.

[0046] By setting the roughness of the surface of the first rod segment 201, the friction force when the first rod segment 201 and the mounting frame 140 are slidingly matched can be increased, and the speed at which the first rod segment 201 moves upward under the action of the air pressure in the compression chamber 120 can be reduced, thereby reducing the collection speed of the water sample when it enters the water collecting cylinder 400, making the collected water sample more uniform.

[0047] In this embodiment, the locking block 510 is connected to a floating ball 530 via a connecting rope 520 , and the floating ball 530 can float on the water surface.

[0048] During use, after the operator puts the sampling tube 100 into the water, water enters the upper chamber 110 of the sampling tube 100, the sampling tube 100 sinks, and the connecting rope 520 between the sampling tube 100 and the float 530 is stretched. Therefore, the length of the connecting rope 520 can be set to be consistent with the depth of the water to be sampled. In this way, when the connecting rope 520 is straightened, the locking block 510 will rotate under the action of the connecting rope 520 and the sampling tube 100, so that the locking block 510 is unlocked, and sampling can then begin.

[0049] In combination with the above embodiments, the specific working principle and working process are as follows:

[0050] See attached Figure 3 As shown, in the initial state, the blocking ball 220 blocks the water inlet 121, so that the water inlet 121 is closed. Before the sampling tube 100 is put into the polluted water body for sampling, the sampling rod 200 is manually operated to move downward in the sampling tube 100. When the sampling rod 200 moves downward, the blocking ball 220 will move synchronously with the sampling rod 200 to leave the water inlet 121, so that the water inlet 121 is opened. The movement of the sampling rod 200 will drive the piston plate 300 to move synchronously, compressing the water collecting tube 400 while increasing the volume of the upper chamber 110 and reducing the volume of the lower chamber, thereby pressurizing the gas in the compression chamber 120, and when the sampling rod 200 moves downward, the sampling rod 200 will drive the locking block 510 to rotate, and at this time the locking block 510 is unlocked and rotated to leave the first groove.

[0051] After the sampling rod 200 moves downward a preset distance, the blocking plate 210 can block the water inlet 121, so that the water inlet 121 is closed. Then the operator manually rotates the locking block 510, so that the locking block 510 is reversed and reset to be stuck in the second groove again. Figure 3 The status shown moves to the Figure 4 At this time, although the gas in the compression chamber 120 has a tendency to cause the piston plate 300 to move upward, the sampling rod 200 is locked by the locking assembly 500 and cannot move upward, so the gas in the compression chamber 120 will remain in a compressed state.

[0052] Next, the sampling tube 100 is put into water, and the upper chamber 110 of the sampling tube 100 is filled with water. The sampling tube 100 will descend in the water, and the connecting rope 520 between the sampling tube 100 and the floating ball 530 will be stretched. After descending to the water layer to be sampled, the connecting rope 520 will be straightened, and the locking block 510 will rotate and leave the second groove under the action of the connecting rope 520 and the sampling tube 100, so that the locking block 510 is unlocked, and the sampling rod 200 can move up and down. At this time, the compression chamber 120 is in the compression chamber 120. Driven by the internal air pressure, the piston plate 300 will move upward in the sampling tube 100 and drive the sampling rod 200 to move upward synchronously. The movement of the sampling rod 200 will open the water inlet 121, and the water sample will be sucked from the water inlet 121 into the water collecting tube 400. The water collecting tube 400 will also be stretched with the movement of the piston plate 300. After the sampling rod 200 moves a preset distance, the sealing plate 210 will seal the water inlet 121, and the water inlet 121 will be closed to complete the sampling.

[0053] When the piston plate 300 moves upward to pump water under the impetus of the air pressure inside the compression chamber 120, the water in the upper chamber 110 of the sampling tube 100 will be discharged, and the volume of the upper chamber 110 will be reduced, thereby gradually reducing the overall gravity of the contaminated water sampling device for water quality testing, and the volume of the compression chamber 120 will increase, thereby increasing the buoyancy of the contaminated water sampling device for water quality testing. In this process, the gravity of the contaminated water sampling device for water quality testing is equal to its buoyancy, and the changes in the gravity and buoyancy of the contaminated water sampling device are balanced by the float 530, thereby enabling the contaminated water sampling device for water quality testing to remain at the water layer to be sampled for sampling. And because the locking assembly 500 is in an unlocked state when pumping water, after the sampling rod 200 moves upward a preset distance to close the water inlet 121, the piston plate 300 will continue to move upward under the action of the original air pressure in the compression chamber 120, thereby further increasing the buoyancy of the contaminated water sampling device for water quality testing, and further reducing the gravity of the contaminated water sampling device for water quality testing, until the contaminated water sampling device for water quality testing after sampling can automatically float to the surface under the action of its own buoyancy without the need for human intervention.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A polluted water sampling device for water quality testing, Features: The invention comprises a sampling tube, a sampling rod, a piston plate, a water collecting tube and a locking assembly; the sampling tube is arranged along a first direction, which is a vertical direction; the piston plate is arranged in the sampling tube and can slide relative to the sampling tube along the first direction; the piston plate divides the sampling tube into an upper chamber and a lower chamber arranged in sequence along the first direction, the upper chamber is located above the lower chamber, the upper chamber is connected to the outside, a water inlet is provided on the lower chamber, and the water inlet is closed in the initial state; the water collecting tube is arranged in the lower chamber along the first direction and can be extended and retracted along the first direction; and the water inlet The sampling tube can be connected with the water collecting tube; the upper and lower ends of the water collecting tube are respectively fixed on the piston plate and the inner bottom wall of the lower chamber; a compression chamber is defined between the water collecting tube and the lower chamber; the compression chamber is always sealed; the gas in the compression chamber is in a compressed state in the initial state; and a space is left in the sampling tube to enable the piston plate to move upward; the sampling rod is arranged along a first direction and can be extended and retracted along the first direction; the sampling rod passes through the upper chamber, the piston plate and the water collecting tube in sequence along the first direction and then extends from the water inlet; the sampling rod is slidably matched with the sampling tube and is fixed to the piston plate; The locking assembly is installed on the sampling cylinder, and the locking assembly has a locking state and an unlocking state. When in the locked state, the sampling rod is allowed to move downward and the upward movement of the sampling rod is restricted. When in the unlocked state, the sampling rod is allowed to move up and down. When the sampling rod moves upward or downward, the water inlet will be opened, so that the water collecting cylinder is connected with the water inlet, and after the sampling rod moves upward or downward a preset distance, the water inlet will be closed; in the initial state, the locking assembly is in a locked state; the water collecting cylinder is a corrugated structure, so that the water collecting cylinder can be extended and retracted in the first direction; a sealing plate and a sealing ball are fixedly arranged on the sampling rod, the sealing ball is arranged at the lower end of the sampling rod, and the sealing plate is arranged above the sealing ball. In the initial state, the sealing ball blocks the water inlet, so that the water inlet is closed, and the distance between the sealing plate and the sealing ball in the first direction is The sampling rod comprises a first rod section and a second rod section, the first rod section and the second rod section are sequentially arranged in the first direction, and the first rod section is located above the second rod section, and the first rod section and the second rod section are both fixedly connected to the piston plate; the second rod section is a conical structure, and the diameter of its upper end is greater than the diameter of its lower end; the locking assembly comprises a locking block, the locking block is mounted on the sampling barrel, and can rotate relative to the sampling barrel, a slot is provided on the sampling rod, the locking block is inserted into the slot in the initial state, and the end face of one end of the locking block inserted into the slot is a wedge-shaped surface, so that the sampling rod can move downward and limit the upward movement of the sampling rod, and when the locking block rotates relative to the sampling barrel, the locking block can leave the slot, and the sampling rod can move up and down; the second rod section is made of rubber, so that the second rod section can be extended and retracted in the first direction.

2. A polluted water sampling device for water quality detection according to claim 1, Features: A handle is arranged at the upper end of the first rod section.

3. A polluted water sampling device for water quality detection according to claim 1, Features: The lock block is connected with a floating ball through a connecting rope, and the floating ball can float on the water surface.

4. A polluted water sampling device for water quality detection according to claim 1, Features: A mounting frame is fixedly arranged on the sampling tube, and the locking block is rotatably mounted on the mounting frame.

5. A polluted water sampling device for water quality detection according to claim 1, Features: The piston plate and the sampling tube are slidably sealed.

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