CN107764586A - Vertical freezing sampling apparatus and its application method - Google Patents

Abstract

The invention discloses a vertical freezing sampling device and its use method. The sampling device includes an operation ship, an automatic control platform, a lifting system, a liquid _CO2 supply device, a sampler and an adjustment bracket installed on the sampler, the automatic control platform, The lifting system and the liquid _CO2 supply device are fixed on the workboat in turn, the lifting system is connected with the sampler through cables, and the adjustment bracket is located at the lower part of the sampler. The hollow copper tube probe in the sampler was connected to the liquid _CO supply through the liquid _CO input line. The automatic leveling system in the automatic control platform controls and adjusts the bracket, so that the copper tube probe is vertically inserted into the deposition layer, and the sample is frozen and collected. Compared with the prior art, the present invention can be used for in-situ collection of sediments in deep water and shallow water areas, and the copper tube probe in the sampler is vertically inserted into the sediments, ensuring the success rate of sampling in deep water and higher flow rates.

Description

Vertical freeze sampling device and method of use thereof

technical field

The invention relates to a sampling device, in particular to a vertical freezing sampling device and a method for using the same.

Background technique

In natural rivers, the area where surface water and shallow groundwater migrate and mix in both directions is called the hyporheic zone. The hyporheic zone is an active ecotone zone and the main place for the exchange, metabolism and storage of particles and solutes in rivers, which is of great significance to the life cycle of river organisms and river health.

At present, the equipment widely used for bottom sediment sampling mainly includes grab mud sampler and gravity sediment sampler. Among them, the grab mud extractor can only collect surface sediments, which greatly disturbs the samples when used, destroys the original state of the sediments, and cannot meet the increasingly fine sediment detection and analysis; the traditional gravity sediment sampling The gravity sampler relies on the gravity of the instrument itself to drop into the sediment, and the sampling depth depends on the gravity of the instrument, which is cumbersome, inconvenient to use, and has a large disturbance to the sample, and the gravity sampler is prone to tilt during sampling, resulting in failure to collect. For sediment samples, the sampling success rate is low.

Contents of the invention

Purpose of the invention: The purpose of the present invention is to provide a vertical frozen sampling device for in-situ collection of sediments in deep and shallow water areas and a method of use thereof.

Technical solution: The vertical freezing sampling device includes a working boat, an automatic control platform, a lifting system, a liquid _CO2 supply device, a sampler and an adjustment bracket installed on the sampler; the automatic control platform, the lifting system and the liquid _CO2 supply device are fixed on On the workboat, the sampler is connected to the hoisting system through a cable, the copper pipe probe in the sampler is connected to the liquid _CO2 supply device through the liquid _CO2 input pipeline, and the automatic leveling system of the automatic control platform controls and adjusts the bracket so that the copper pipe The probe is inserted vertically into the sediment, and the sample is frozen and collected.

The positioning system built in the automatic control platform receives the images and data sent back in real time by the wireless signal transmitter and the underwater camera.

The excitation device of the gravity hammer in the sampler is controlled by an automatic control platform.

The adjustment bracket is composed of three length-adjusting brackets and a balance adjustment device between the brackets.

It also includes a wireless signal transmitter and an underwater camera located above the balance adjustment device, and the positioning system receives images and data sent back in real time by the wireless signal transmitter and the underwater camera.

The using method of vertical freezing sampling device comprises the following steps:

(1) Drive the operation boat to the place where sampling is required, and control the sampler to slowly lower it to the bottom of the river;

(2) adjust the position of the sampler by the data sent back in real time by the wireless signal transmitter and the underwater camera;

(3) After determining the position of the sampler, control and adjust the bracket through the automatic leveling system so that the copper tube probe is perpendicular to the deposition layer;

(4) Excite the gravity hammer, and insert the copper tube probe vertically into the deposition layer;

(5) Open the valve so that liquid CO ₂ enters the copper tube probe through the CO ₂ input pipeline, the liquid CO ₂ vaporizes and absorbs heat, the deposits around the copper tube probe are rapidly frozen, and the generated CO ₂ gas is composed of CO ₂ output line discharge;

(6) When the data returned by the temperature sensor reaches a stable state, control the lifting system, lift the sampler, and remove the copper tube probe and sample;

(7) Pour hot water into the copper tube probe to separate the sample from the copper tube probe, put the sample into a sample box, and put it in a refrigerator.

Beneficial effects: Compared with the prior art, the present invention has the following advantages: (1) It can be used for in-situ collection of columnar sediments in deep water areas, and can also directly use a sampler equipped with a liquid _CO2 supply device for sediments in shallow water areas in-situ collection, and ensure the sampling success rate of the equipment at a higher flow rate; (2) minimize the biochemical activity in the sample and ensure the original state of the sample; (3) reduce the impact of the sampler on the sample damage to the structure, and the effect of river water on the composition of the sample.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of sampler;

Fig. 3 is a schematic structural diagram of the adjustable bracket.

Detailed ways

As shown in Figure 1, the vertical freezing sampling device includes an operation ship 1, an automatic control platform 2, a lifting system 3, a liquid _CO2 supply device 5, a sampler 6 and an adjustment bracket 7 installed on the sampler; the automatic control platform 2, The lifting system 3 and the liquid CO ₂ supply device 5 are fixed on the workboat 1, the sampler 6 installed on the adjustment bracket 7 is connected to the lifting system 3 through the cable 4, and the copper tube probe 8 in the sampler 6 passes through the liquid CO ₂ The input pipeline 13 is connected to the liquid _CO2 supply device 5, and the automatic leveling system of the automatic control platform 2 controls and adjusts the bracket 7, so that the copper tube probe 8 is vertically inserted into the sediment layer, and samples are frozen and collected.

The positioning system installed in the automatic control platform 2 receives images and data sent back by the wireless signal transmitter 19 and the underwater camera 10 in real time.

As shown in Figure 2, the sampler 6 includes a hollow copper tube probe 8, a temperature sensor 16, a wireless signal transmitter 9, a camera 10, a temperature probe 11, a gravity hammer 12, a liquid _CO input pipeline 13 and a _CO output pipeline 14, wherein the copper tube probe 8 is detachable and connected to the upper structure through bolts 15; the hollow copper tube probe 8 is connected to the liquid CO ₂ supply device 5 through the liquid CO ₂ input pipeline 13; the excitation device of the gravity hammer 12 is controlled by the automatic The control platform 2 performs control.

As shown in FIG. 3 , the adjustment bracket 7 is composed of three length-adjustable brackets 19 and a balance adjustment device 18 between the brackets, and is controlled by an automatic leveling system.

The using method of vertical freezing sampling device comprises the following steps:

(1) Drive the operation boat 1 to the place where sampling is required, and control the sampler 6 to slowly lower it to the bottom of the river;

(2) select a suitable sampling environment by the images and data sent back in real time by the wireless signal transmitter 9 and the underwater camera 10, and adjust the position of the sampler 6;

(3) After determining the position of the sampler 6, adjust the tripod 19 through the automatic leveling system so that the copper tube probe 8 is perpendicular to the deposition layer;

(4) Excite the gravity hammer 12, and insert the copper pipe probe 8 vertically into the deposition layer;

(5) Open the valve so that liquid _CO2 enters the copper tube probe 8 through the liquid _CO2 input pipeline 13. Because the liquid _CO2 vaporizes and absorbs heat, the deposits around the copper tube probe 8 are quickly frozen. Atmospheric pressure is always maintained in the tube probe, and the _CO produced can be discharged from the _CO output line 14;

(6) When the data returned by the temperature sensor 16 reaches a stable state substantially, the lifting system 3 is controlled, the sampler 6 is proposed, and the screw 15 is rotated to take off the copper pipe probe 8 and the sample;

(7) Pour hot water into the copper tube probe 8 to separate the sample from the copper tube probe 8, put the sample into the sample box, and put it in the refrigerator, or cut the sample with a knife as required, Put into sampling bottle.

Claims (6)

1. a vertical freezing sampling device is characterized in that: comprise operation vessel (1), automatic control platform (2), lifting system (3), liquid _CO supply device (5), sampler (6) and be installed in The adjustment bracket (7) on the sampler; the automatic control platform (2), the lifting system (3) and the liquid _CO supply device (5) are fixed on the workboat (1), and the automatic control platform (2) Built-in positioning system and automatic leveling system, the positioning system is connected with the lifting system (3), the automatic leveling system is connected with the sampler (6); the sampler (6) includes Hollow copper tube probe (8), liquid _CO input line (13) and _CO output line (14), the hollow copper tube probe (8) is supplied with liquid _CO through the liquid _CO input line (13) The device (5) is connected, and the automatic leveling system controls and adjusts the bracket (7), so that the copper tube probe (8) is vertically inserted into the deposition layer, and the sample is frozen and collected. 2. The vertical cryo-sampling device according to claim 1, characterized in that: the hollow copper tube probe (8) is detachable, and the probe is equipped with a temperature sensor. 3. The vertical freezing sampling device according to claim 1, characterized in that: the counterweight of the sampler (6) is selected according to the water depth, and the excitation device of the counterweight is controlled by the automatic control platform (2). 4. The vertical cryo-sampling device according to claim 1, characterized in that: the adjustment bracket (7) is composed of a length-adjustable bracket (19) and a balance adjustment device (18) between the brackets. 5. The vertical freezing sampling device according to claim 1, characterized in that: it also includes a wireless signal transmitting device (9) and an underwater camera (10) positioned above the balance adjustment device (18), and the positioning system receives wireless signals. The images and data sent back by the signal transmitting device (9) and the underwater camera (10) in real time. 6. A method for using a vertical freezing sampling device, characterized in that: comprising the following steps: (1) Drive the operation boat (1) to the place where sampling is required, and control the sampler (6) to slowly lower it to the bottom of the river; (2) adjust the position of the sampler (6) by the image and data sent back in real time by the wireless signal transmitter (9) and the underwater camera (10); (3) After determining the position of the sampler (6), control and adjust the bracket (7) through the automatic leveling system so that the copper tube probe (8) is perpendicular to the deposition layer; (4) Excite the gravity hammer (12), and insert the copper tube probe (8) vertically into the deposition layer; (5) Open the valve to make liquid _CO2 enter the copper tube probe (8) through the _CO2 input pipeline (13), the liquid _CO2 absorbs heat, and the deposits around the copper tube probe are rapidly frozen, and the produced CO _2. The gas is discharged from the _CO output pipeline (14); (6) When the data returned by the temperature sensor (16) reaches a stable state, the lifting system (3) is controlled, the sampler (6) is proposed, and the copper tube probe (8) and the sample are removed; (7) Pour hot water into the copper tube probe (8) to separate the sample from the copper tube probe (8), put the sample into a sample box, and put it in a refrigerator.