On-site sampling device for seawater oil detection and analysis

Abstract

The utility model discloses an on-site sampling device for seawater oil detection and analysis, and belongs to the field of seawater sampling devices. Comprising a shell, a rope is connected to the shell, and a plurality of sampling bottles are arranged in the shell; the outer side cover is rotationally arranged in the shell and sleeves the outer side of the sampling bottle; the sampling opening is formed in the lower side of the shell, and a water inlet right opposite to the sampling opening is formed in the lower side of the sampling bottle; the connecting hole is formed in the lower side of the outer side cover, and the sampling opening is communicated with the water inlet through rotation of the outer side cover; the plurality of control assemblies are arranged between the shell and the outer side cover and are used for controlling the sampling depth of the sampling bottle; a floating assembly is further arranged in the shell and used for driving the shell to float and be recycled after sampling is completed. The on-site sampling device for seawater oil detection and analysis has the beneficial effects that by arranging the outer side cover, sampling can be automatically carried out after a preset depth is reached, an electronic device is not needed for control, and sampling failure caused by failure of the electronic device is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seawater sampling device, in particular to a field sampling device for seawater oil detection and analysis. BACKGROUND

[0002] Seawater sampling research can reflect the potential trend of water quality change in a system, and plays a crucial role in the ecological research of the ocean. The current seawater sampling method usually uses a rope to put a sampler into the sea, adjusts the depth of the sampler by controlling the winding and unwinding of the rope, and controls the sampler to reach the predetermined depth by using an electronic device, and then takes the sample. After sampling is completed, the sampler is retrieved through the rope. However, this method cannot keep the rope in a vertical state due to the ocean current, and the length of the rope is different from the actual depth. Meanwhile, the electronic device is prone to failure under the pressure of the deep sea.

[0003] Therefore, there is a need for a field sampling device for seawater oil detection and analysis to solve the above problems. CONTENT OF THE INVENTION

[0004] The content part of the present application is used to introduce the concept in a simple form, which will be described in detail in the specific embodiment part. The content part of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0005] In order to solve the technical problems mentioned in the background part, some embodiments of the present application provide a field sampling device for seawater oil detection and analysis, which comprises: a shell, a rope connected to the shell, a plurality of sampling bottles arranged in the shell; an outer cover rotatably arranged in the shell and sleeved outside the sampling bottles; a sampling port arranged on the lower side of the shell, and a water inlet arranged on the lower side of the sampling bottle and opposite to the sampling port; a connecting hole arranged on the lower side of the outer cover, and the sampling port and the water inlet are communicated by rotating the outer cover; a plurality of control components arranged between the shell and the outer cover for controlling the sampling depth of the sampling bottle; the control component comprises: an adjusting arc groove arranged on the upper side of the outer cover, an adjusting sliding block slidably connected in the adjusting arc groove, a sliding plate fixedly connected in the adjusting arc groove on the outer cover, a elastic rope connected between the adjusting sliding block and the sliding plate, a pressure cylinder arranged on the side wall of the shell, a pressure plate slidably connected in the pressure cylinder, a pressure spring connected between the pressure plate and the pressure cylinder, a ring-shaped block rotatably connected on the upper end of the outer cover, a control pin arranged on the ring-shaped block, the ring-shaped block and the control pin are synchronously rotated, a rack fixedly connected to the pressure plate, and a toothed pattern arranged on the outer side of the ring-shaped block, the rack and the toothed pattern are engaged; the shell further comprises a floating component for bringing the shell to float after sampling is completed.

[0006] By using adjustable sliders and sliding plates, when the outer shell descends into the sea and reaches a predetermined depth, the pressure plate, under water pressure, drives the rack and pinion mechanism, which in turn moves the outer casing. The connecting hole connects the sampling port to the water inlet. Utilizing the different water pressures at different depths, automatic sampling is achieved upon reaching the predetermined depth, avoiding errors caused by controlling the sampling depth with ropes. The outer casing's automatic sampling upon reaching the predetermined depth eliminates the need for electronic control, preventing sampling failures due to electronic malfunctions under the high pressure of the deep sea.

[0007] Furthermore, the adjusting slider is threadedly connected to a knob, the knob having a threaded rod that is inserted into and threadedly connected to the adjusting slider, and the knob also having an edge, with a boss provided on the outer side of the arc groove, the edge abutting against the boss and limiting the adjustment slider.

[0008] By adjusting the slider, and setting different depth scale values ​​on the arc groove, the rope is stretched when the slider is adjusted to different scale positions. When sampling at a deeper depth, the stretching length is larger, which in turn requires greater water pressure to make the pressure plate move.

[0009] Furthermore, an annular groove is provided at the upper end of the outer cover, and an annular block is embedded in the annular groove and rotates. A pin hole is provided on the bottom wall of the annular groove, and a positioning pin is slidably provided on the annular block with one end inserted into the pin hole. A positioning spring is connected between the positioning pin and the annular block. A buoyancy plate is provided inside the sampling bottle, and a pusher is provided on the buoyancy plate. The positioning pin is pushed out by inserting one end of the pusher into the pin hole.

[0010] With the help of the ring block and positioning pin, when the ring block moves under the action of water pressure, it drives the outer cover to move synchronously under the action of the positioning pin, so that the sampling port is connected to the water inlet and the tension rope is stretched. After the sampling bottle is filled with water, the buoyancy plate moves upward, which pushes the positioning pin out. Then the outer cover returns to the initial state under the action of the tension rope, and the seawater in the sampling bottle will not flow out.

[0011] Furthermore, the buoyancy assembly includes: a gas cylinder installed inside the outer casing, the gas cylinder being connected to a sealing component for controlling the gas cylinder's exhaust, the sealing component including: a fixed platform fixed inside the outer casing, the fixed platform being sealed to the gas cylinder's outlet end, a sealing plate being provided on the fixed platform, and a sealing spring being connected between the sealing plate and the inner wall of the outer casing.

[0012] With the gas cylinder and sealing device in place, when there is no need to float, the sealing device seals the gas cylinder, allowing it to descend to a predetermined depth for sampling. After sampling is completed, the sealing device no longer seals the gas cylinder, allowing the buoyancy airbag to inflate and drive the outer shell to float up for recovery.

[0013] Further, the fixed table is also slidably connected with a limiting buckle for limiting the closing plate, the limiting buckle is connected with the fixed table through a limiting spring, the upper end surface of the limiting buckle has an inclined surface in contact with the closing plate, the outer shell end is provided with a buoyancy air bag, and the buoyancy air bag is connected with the gas cylinder through a blocking piece.

[0014] When the limiting buckle is pulled to the position where the closing plate is no longer limited, the gas in the gas cylinder enters the buoyancy air bag, and when the buoyancy air bag is balanced with the gas pressure in the gas cylinder, the closing plate returns to the closed position under the action of the closing spring, and when the outer shell returns to the sea surface, the limiting buckle is pushed to move under the action of the inclined surface, so that the limiting buckle limits the closing plate again under the action of the limiting spring, and then the gas in the buoyancy air bag is discharged.

[0015] Further, one end of the rack is connected with a pull rope, and the pull rope is connected with the limiting buckle through a guide piece.

[0016] Through the pull rope and the guide piece, when the sampling bottles are all sampled, the pull rope is pulled to the state where the closing plate is no longer limited.

[0017] Further, the upper end of the sampling bottle is provided with a bottle cap for opening the sampling bottle to take out the sample, the upper end side wall of the sampling bottle and the side wall of the outer shell are both provided with an exhaust port, and the upper end side wall of the outer side cover is provided with a side hole for communicating with the exhaust port.

[0018] Through the exhaust hole, when the sampling port is filled with water, the exhaust hole can discharge the gas in the middle of the sampling bottle.

[0019] Further, the outer side cover, the outer shell and the sampling bottle are sealingly matched.

[0020] Further, the lower end of the outer shell is fixedly connected with a counterweight.

[0021] Through the counterweight, the outer shell can always sink into the sea in a correct posture.

[0022] The beneficial effects of the present application are:

[0023] 1. By setting the adjusting slider and the sliding plate, when the shell falls in the sea, the pressure plate drives the rack to move under the action of water pressure, drives the outer cover to move, and the connecting hole communicates the sampling port with the water inlet, so that the water pressure at different depths is different, so that automatic sampling can be achieved after reaching the predetermined depth, avoiding the control of the sampling depth by the rope, resulting in errors in the sampling depth. By setting the outer cover, automatic sampling can be achieved after reaching the predetermined depth, without the need for electronic devices to control, avoiding the failure of electronic devices under high pressure in deep sea, resulting in sampling failure.

[0024] 2. By setting the adjusting slider, the arc-shaped groove can also be provided with scale values corresponding to different depths, and by adjusting the adjusting slider to different scale positions, the pull rope is in a stretched state, and when sampling at a deeper depth is needed, the stretched length is larger, so that a larger water pressure is needed to make the pressure plate move.

[0025] 3. By setting the gas cylinder and the plugging piece, when it is not needed to float up, the plugging piece closes the gas cylinder, so that it can be lowered to the predetermined depth for sampling, and after sampling is completed, the plugging piece no longer closes the gas cylinder, so that the buoyancy air bag can be inflated to drive the shell to float up and be recycled. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the application.

[0027] In addition, throughout the drawings, the same or similar reference numerals designate the same or similar elements. It should be understood that the drawings are schematic, and the elements and elements are not necessarily drawn according to the scale.

[0028] In the drawings:

[0029] Figure 1 is a whole schematic diagram according to an embodiment of the present application;

[0030] Figure 2 is Figure 1 the mounting structure schematic diagram of the gas cylinder in the embodiment;

[0031] Figure 3 is Figure 1 the mounting schematic diagram of the sampling bottle in the embodiment;

[0032] Figure 4 is Figure 3 the enlarged schematic diagram of A in the embodiment;

[0033] Figure 5 is Figure 3An enlarged schematic view at B;

[0034] Figure 6 is a schematic view of the entire section of the present application;

[0035] Figure 7 is Figure 1 An installation schematic view of the buoyancy plate in the embodiment;

[0036] Figure 8 is Figure 1 An installation schematic view of the fixing table and the limiting buckle in the embodiment.

[0037] Reference signs:

[0038] 100, housing; 101, rope; 102, counterweight; 103, sampling bottle; 104, outer cover; 105, sampling port; 106, water inlet; 107, connecting hole; 108, buoyancy air bag; 109, bottle cap; 110, exhaust port; 111, side hole; 112, pressure cylinder; 113, pressure plate; 114, pressure spring; 115, rack; 116, annular groove; 117, annular block; 118, positioning pin; 119, positioning spring; 120, pin hole; 121, tooth; 122, buoyancy plate; 123, push head; 124, arc-shaped groove; 125, adjustment sliding block; 126, sliding plate; 127, elastic rope; 128, knob; 129, threaded rod; 130, edge; 131, boss; 132, gas cylinder; 133, sealing element; 134, fixing table; 135, closing plate; 136, closing spring; 137, limiting buckle; 138, limiting spring; 139, pull rope; 140, push ring plate; 141, protrusion. DETAILED DESCRIPTION

[0039] Embodiments of the present disclosure will be described in more detail with reference to the drawings. Although certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0040] It should also be noted that, for the sake of brevity, only parts of the present application are shown in the drawings. The embodiments and features in the present disclosure can be combined with each other in the case of no conflict.

[0041] It should be noted that the terms “first”, “second”, and the like mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0042] It should be noted that the modification of "one", "a plurality of" mentioned in the present disclosure is illustrative but not restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0043] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0044] Referring to Figures 1-8 , the shell 100, the rope 101, the weight block 102, the sampling bottle 103, the outer cover 104, the sampling port 105, the water inlet 106, the connecting hole 107, the buoyancy air bag 108. The upper end of the shell 100 is connected with the rope 101, in use, the shell 100 is put into the sea through the rope 101, at the same time, the weight block is arranged at the lower end of the shell 100, so that the weight block 102 is always at the lower end when the shell 100 is put into the sea, ensuring the correct posture. The upper end of the shell 100 is provided with a buoyancy air bag 108, the buoyancy air bag 108 has a first state of contraction and a second state of expansion, in the first state, the shell 100 can sink under the action of the weight block, when in the second state, the buoyancy air bag 108 can drive the shell 100 to float up. Three sampling bottles 103 are fixedly arranged in the shell 100, the upper end of the sampling bottle 103 is provided with a bottle cap 109. The shell 100 has a gap at the bottle cap 109, facilitating the opening of the bottle cap 109 for sampling.

[0045] The lower side of the shell 100 is provided with three sampling ports 105, the lower side of the sampling bottle 103 is provided with three water inlets 106, the sampling ports 105 are respectively opposite to the three water inlets 106. In order to avoid seawater flowing into the sampling bottle 103 without reaching the predetermined depth, the outer cover 104 is sleeved outside the sampling bottle 103, the outer cover 104 is rotationally arranged in the shell 100, the inner wall of the outer cover 104 is tightly fitted with the outer wall of the sampling bottle 103 to realize sealing. Similarly, the outer wall of the outer cover 104 is tightly fitted with the inner wall of the shell 100 to realize sealing. The lower end of the outer cover 104 is provided with a connecting hole 107, the connecting hole 107 is communicated or separated with the water inlet 106 through the rotation of the outer cover 104.

[0046] In order to make the seawater smoothly enter the sampling bottle 103, the exhaust port 110 is arranged on the upper end of the side wall of the sampling bottle 103 and the upper end of the side wall of the shell 100, the side hole 111 is arranged on the side wall of the outer cover 104, the exhaust port is communicated through the side hole 111, and the air in the sampling bottle 103 is exhausted. When the water inlet 106 is communicated with the sampling port 105, the exhaust port can exhaust.

[0047] Due to the ocean current in the ocean, the rope 101 is inclined, cannot be in the vertical state, the length of the rope 101 is different from the actual depth, and the water pressure of different depths of seawater is different, so it is necessary to sample according to different water pressure, ensure the accuracy of the sampling depth, therefore the following scheme is adopted.

[0048] Three control assemblies corresponding to the sampling bottle 103 are arranged in the shell 100, and the control assembly comprises: a pressure cylinder 112 opened on the side wall of the shell 100, a pressure plate 113 is slidably connected in the pressure cylinder 112, and the pressure plate 113 slides in the pressure cylinder 112 under the action of water pressure. The connection between the pressure plate 113 and the pressure cylinder 112 is connected by a pressure spring 114, and the two ends of the pressure spring 114 are fixedly connected to the pressure plate 113 and the pressure cylinder 112 respectively. The pressure plate 113 is fixedly connected with a rack 115. The outer cover 104 is driven to rotate through the rack 115, so that the sampling bottle 103 can sample.

[0049] After a depth sampling is completed, the sampling bottle 103 needs to be closed, so the outer cover 104 needs to return to the initial position after sampling is completed, therefore the following scheme is adopted.

[0050] An annular groove 116 is opened on the upper end face of the outer cover 104, an annular block 117 is rotatably connected in the annular groove 116, a positioning pin 118 is slidably arranged on the annular block 117, a positioning spring 119 is connected between the positioning pin 118 and the annular block 117, and the two ends of the positioning spring 119 are fixedly connected to the positioning pin 118 and the annular block 117 respectively. Meanwhile, a pin hole 120 for embedding the positioning pin 118 is opened on the lower end wall of the annular groove 116. The outer side wall of the annular block 117 has a tooth 121, the tooth 121 is engaged with the rack 115, a buoyancy plate 122 is arranged in the sampling bottle 103, a push head 123 is fixedly connected to the buoyancy plate 122, and a hole is opened on the upper end of the sampling bottle 103 for the push head 123 to pass through. A push ring plate 140 is arranged below the pin hole 120, the push ring plate 140 has a protrusion 141, one end of the protrusion 141 is inserted into the pin hole 120. The push head 123 applies a pushing force to the push ring plate 140, so that the push ring plate 140 and the protrusion 141 move, and the protrusion 141 pushes the positioning pin 118 out of the pin hole. When the push head 123 abuts to the lower end face of the push ring plate 140, the push head 123 can slide on the lower end face of the push ring plate 140.

[0051] Three arc-shaped grooves 124 are formed on the shell 100, and an adjusting slider 125 is slidably connected in the arc-shaped grooves 124. The outer cover 104 is fixedly connected with a sliding plate 126 which is slidably arranged in the arc-shaped grooves 124. The sliding plate 126 is connected with the adjusting slider 125 through an elastic rope 127. The outer cover 104 has a limit position. Under the action of the pressure plate 113 and the rack 115, the outer cover 104 overcomes the tension of the elastic rope 127 and moves from the limit position to a position where the sampling bottle 103 can be sampled. By adjusting the position of the adjusting slider 125 in the arc-shaped groove 124, the length of the elastic rope 127 is different. When the length of the elastic rope 127 is short, the pressure plate 113 can drive the outer cover 104 to move under the action of small water pressure through the rack 115. When the length of the elastic rope 127 is long, the pressure plate 113 needs to drive the outer cover 104 to move under the action of large water pressure. A scale corresponding to different pressures is arranged on one side of the arc-shaped groove 124. When the adjusting slider 125 is at different scale positions, the pressure plate 113 needs to drive the outer cover 104 to move to the sampling position under the corresponding pressure. The specific scale value and scale range can be obtained by experiment.

[0052] Through the above scheme, when the shell 100 sinks to a predetermined depth, the outer cover 104 is driven to rotate to a sampling position by the pressure plate 113, the rack 115 and the annular block 117 to sample. When it is needed to complete, the push head 123 is pushed out of the positioning pin 118 on the buoyancy plate 122, and the outer cover 104 returns to the initial position under the action of the elastic rope 127, so as to close the sampling bottle 103. When the shell 100 continues to sink or starts to float up, the external seawater cannot mix into the sampling bottle 103. By controlling the position of the adjusting slider 125, seawater at different depths can be sampled.

[0053] The adjusting slider 125 is threadedly connected with a knob 128. The knob 128 has a threaded rod 129 which is inserted into the adjusting slider 125 and threadedly connected with the adjusting slider 125. The knob 128 also has an edge 130. A boss 131 is arranged outside the arc-shaped groove 124. By rotating the knob 128, the edge 130 is abutted with the boss 131 under the action of the threaded rod 129. A rubber anti-slip layer can be arranged on the boss 131, so as to position the adjusting slider 125. By controlling the positions of different adjusting sliders 125, sampling can be performed at three depths respectively.

[0054] When the three sampling bottles 103 are all completed, the buoyancy air bag 108 needs to be inflated to retrieve the shell 100, so the following scheme is adopted.

[0055] In an embodiment, the buoyancy plate 117 is a foam plate. A through hole is arranged on the buoyancy plate 117, so that the bottle cap of the sampling bottle 103 can be opened, and the sampling tube can be inserted through the through hole to draw out the sample in the sampling bottle 103.

[0056] In another embodiment, when the sample needs to be taken out, the adjusting slide 125 is no longer limited, thereby pushing the sliding plate 126 to move, so that the outer cover 104 moves to the sampling state, at which time the sample can flow out from the sampling port 105 and the water inlet 106 for collection.

[0057] A gas cylinder 132 is installed in the shell 100, and a blocking piece 133 for connecting the gas cylinder 132 and the buoyancy air bag 108 is arranged in the shell 100. The blocking piece 133 includes a fixed table 134 fixed in the shell 100, which is in sealing cooperation with the gas outlet end of the gas cylinder 132. A closing plate 135 for blocking the gas cylinder 132 is arranged on the fixed table 134, and a closing spring 136 is connected between the closing plate 135 and the shell. The two ends of the closing spring 136 are fixedly connected with the closing plate 135 and the shell, respectively. A limiting buckle 137 for limiting the closing plate 135 is slidingly arranged on the fixed table 134. The number of the limiting buckle 137 is consistent with the number of the sampling bottles 103. A limiting spring 138 is connected between the limiting buckle 137 and the fixed table 134, and the two ends of the limiting spring 138 are fixedly connected with the limiting buckle 137 and the fixed table 134, respectively. When the limiting buckle 137 does not limit the closing plate 135, the closing plate 135 is pushed away under the action of gas pressure to inflate the buoyancy air bag 108, so that the buoyancy air bag 108 expands to the second state, and the buoyancy air bag 108 is in pressure balance with the gas cylinder 132.

[0058] One end of the rack 115 is connected with a pull rope 139, which is connected with the limiting buckle 137 through a guide wheel piece. After the pressure plate 113 and the rack 115 drive the outer cover 104 to the sampling position, the limiting buckle 137 is pulled by the pull rope 139 to no longer limit the closing plate 135.

[0059] Working process or use method:

[0060] 1. Adjust the three adjusting slides 125 to the scale positions of the required sampling depth, respectively, and then put the shell 100 into the detection sea area. Under the action of the matching block, the shell 100 sinks to the predetermined depth. Under the action of water pressure, the pressure plate 113 drives the rack 115 to move, so that the rack 115 drives the annular block 117 and the outer cover 104 to rotate, and the outer cover 104 rotates to the sampling state, and sampling starts. When the sampling is completed, the buoyancy plate 122 floats up, the limiting pin is pushed out of the pin hole 120 by the push head 123, and the outer cover 104 returns to the initial state under the action of the elastic rope 127, and the sampling bottle 103 is closed. Then, the shell 100 continues to sink until the three sampling bottles 103 complete sampling.

[0061] 2、When the three sampling bottles 103 are all completed sampling, the limiting buckle 137 no longer limits the closure plate 135 by pulling the rope 139. At this time, the gas pressure of the gas cylinder 132 pushes the closure plate 135 to make the buoyancy air bag 108 expand. Until it expands to the second state, at this time the buoyancy air bag 108 is balanced with the gas pressure of the gas cylinder 132, and the closure plate 135 returns to the closed position under the action of the closure plate 135. When the shell 100 floats on the sea surface, the pressure plate 113 returns to the initial state. At this time, the limiting buckle 137 continues to limit the closure plate 135 under the action of the limiting spring 138.

[0062] 3、Open the bottle cap 109 to sample. After releasing the gas in the buoyancy air bag 108, the next operation is facilitated.

[0063] The above description is only some of the preferred embodiments of the present disclosure and the explanation of the technical principles applied. Those skilled in the art should understand that the scope of the application involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features disclosed in the embodiments of the present disclosure (but not limited to) having similar functions to form technical solutions.

Claims

1. A field sampling device for detecting and analyzing oil in seawater, characterized in that: The utility model relates to a kind of field sampling devices for seawater oil detection analysis, including: Shell (100), rope (101) is connected on shell (100), a plurality of sampling bottles (103) are provided in shell (100); Outer cover (104), rotation is arranged in shell (100) and is sleeved on the outside of sampling bottle (103); Sampling port (105), it is opened in the lower side of shell (100), and the lower side of sampling bottle (103) is opened with water inlet (106) opposite to sampling port (105); Connecting hole (107), it is opened in the lower side of outer cover (104), and sampling port (105) is communicated with water inlet (106) by the rotation of outer cover (104); A plurality of control components are arranged between shell (100) and outer cover (104), for controlling the sampling depth of sampling bottle (103); The control component includes: the adjustment arc groove opened on the upper side of outer cover (104), adjustment sliding block (125) is slidably connected in the adjustment arc groove, the sliding plate (126) fixedly connected in the adjustment arc groove is connected between adjustment sliding block (125) and outer cover (104), and elastic rope (127) is connected between sliding plate (126) and adjustment sliding block (125);Pressure cylinder (112) is opened on the side wall of shell (100), pressure plate (113) is slidably connected in pressure cylinder (112), and pressure spring (114) is connected between pressure plate (113) and pressure cylinder (112);Annular block (117) is rotatably connected on the upper end of outer cover (104), control pin is arranged on annular block (117), annular block (117) is synchronously rotated by control pin, pressure plate (113) is fixedly connected with rack (115), and the outer side of annular block (117) is provided with tooth (121), and rack (115) is engaged with tooth (121); Shell (100) is also provided with float-up assembly, for driving shell (100) to float after sampling is completed.

2. The field sampling device for seawater oil detection analysis according to claim 1, wherein: The adjustment sliding block (125) is threadedly connected with a knob (128), the knob (128) has a threaded rod (129) inserted into the adjustment sliding block (125) and threadedly connected with the adjustment sliding block (125), the knob (128) further has an edge (130), the outer side of the arc-shaped groove (124) is provided with a boss (131), and the edge (130) is in abutment with the boss (131) and limits the adjustment sliding block (125).

3. The field sampling device for seawater oil detection analysis according to claim 2, wherein: The outer cover (104) upper end is provided with an annular groove (116), the annular block (117) is embedded into the annular groove (116) and rotates, the bottom wall of the annular groove (116) is provided with a pin hole (120), the annular block (117) is provided with a positioning pin (118) which is inserted into the pin hole (120) and slides, the positioning pin (118) and the annular block (117) are connected with a positioning spring (119), the sampling bottle (103) is provided with a buoyancy plate (122), the buoyancy plate (122) is provided with a push head (123), and one end of the push head (123) is inserted into the pin hole (120) to push out the positioning pin (118).

4. The on-site sampling device for seawater oil detection analysis according to claim 3, wherein: The floating-up assembly comprises a gas cylinder (132) installed in the shell (100), and the gas cylinder (132) is connected with a blocking piece (133) for controlling the exhaust of the gas cylinder (132), the blocking piece (133) comprises a fixed table (134) fixed in the shell (100) and in sealing fit with the gas outlet end of the gas cylinder (132), and the fixed table (134) is provided with a closing plate (135) connected with the inner wall of the shell (100) through a closing spring (136).

5. The on-site sampling device for seawater oil detection analysis according to claim 4, wherein: The fixed table (134) is further connected with a limiting buckle (137) for limiting the closing plate (135) through a limiting spring (138), and the limiting buckle (137) has an inclined surface in contact with the closing plate (135) on the upper end surface, and the shell (100) is provided with a buoyancy air bag (108) connected with the gas cylinder (132) through the blocking piece (133).

6. The on-site sampling device for seawater oil detection analysis according to claim 5, wherein: One end of the rack (115) is connected with a pull rope (139) connected with the limiting buckle (137) through a guide piece.

7. The on-site sampling device for seawater oil detection analysis according to claim 1, wherein: The sampling bottle (103) is provided with a bottle cap (109) on the upper end for opening the sampling bottle (103) to take out the sample, the upper end side wall of the sampling bottle (103) and the side wall of the shell (100) are both provided with an exhaust port (110), and the upper end side wall of the outer cover (104) is provided with a side hole (111) for connecting the exhaust port (110), and the exhaust port (110) is connected for exhaust by rotating the outer cover (104) to move the side hole (111) to the position of the exhaust port (110).

8. The on-site sampling device for seawater oil detection analysis according to claim 1, wherein: The outer cover (104), the shell (100) and the sampling bottle (103) are in sealing fit.

9. The on-site sampling device for seawater oil detection analysis according to claim 1, characterized in that: The lower end of the shell (100) is fixedly connected with a counterweight (102) outside.

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