A fixed-point closed sampling device

Abstract

The present invention discloses a fixed-point sealed sampling device, which relates to the technical field of fixed-point sampling devices. A fixed-point sealed sampling device comprises: a connected upper shell and a lower shell. When the upper shell and the lower shell sink, the upper shell and the lower shell move away from each other to extend the span between them. When the upper shell and the lower shell reach the sampling position, the upper shell and the lower shell move closer to each other to reduce the span between them. The upper shell and the lower shell of the present invention form a structure with adjustable span through an airbag telescopic column and a tension spring. Increasing the span during sinking can reduce the risk of center of gravity shift, significantly improve the stability of the device in deep hole water flow, and avoid depth deviation caused by large swings. Reducing the span during sampling can not only make the waist-shaped liquid inlet accurately extend out of the lower shell, but also trigger the support arm to automatically unfold, providing a stable structural foundation for subsequent positioning and sampling actions.

Description

Technical Field

[0001] The invention belongs to the technical field of fixed-point sampling devices, and in particular relates to a fixed-point sealed sampling device. Background Art

[0002] In the fixed-point sampling operation of underwater deep-hole sinkholes, existing technologies face many difficult-to-overcome challenges, which seriously affect the accuracy and reliability of sampling. During the sinking sampling process, the current sampling device is easily disturbed by factors such as water flow and underwater fluctuations due to the lack of an effective stable structure, causing the device to shake and shift in the water, making it difficult to sample at the preset sampling position, greatly reducing the accuracy of fixed-point sampling. Moreover, when performing sampling operations, traditional devices often have defects in their own structural design, with a large extended area and volume. Under the action of water flow and turbulence, they will be subjected to greater forces, further aggravating the shaking of the device, causing the sampling position to shift, and failing to obtain the truly required fixed-point samples.

[0003] Aiming at these problems, a fixed-point closed sampling device is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a fixed-point closed sampling device that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a fixed-point closed sampling device, comprising: a connected upper shell and lower shell, when the upper shell and lower shell sink, the upper shell and lower shell move away from each other to extend the span between the two, when the upper shell and lower shell reach the sampling position, the upper shell and lower shell approach each other to reduce the span between the two; an upper sampling chamber, arranged in the upper shell; a liquid inlet pipe with a closed end, one end is fixedly connected to the upper shell, and the other end passes through the lower shell, a waist-shaped liquid inlet is provided on the outer circumference of the liquid inlet pipe, when the sampling position is reached, the waist-shaped liquid inlet extends from the bottom of the lower shell; a support arm, circumferentially arranged on the lower shell, when the upper shell and lower shell approach each other, the support arm automatically unfolds and contacts the inner wall of the sampling position, and automatically retracts and retracts the support arm when sampling is completed.

[0006] Preferably, an airbag telescopic column is fixedly connected between the upper shell and the lower shell, a tension spring is sleeved on the airbag telescopic column, and two ends of the tension spring are respectively connected to the upper shell and the lower shell.

[0007] Preferably, a lower sampling chamber is fixedly connected to the lower shell body, and a sampling port is provided on a side of the lower sampling chamber close to the liquid inlet pipe, and the sampling port corresponds to the waist-shaped liquid inlet.

[0008] Preferably, a sealing cylinder is fixedly connected to the upper shell body, a piston plate is slidably connected to the sealing cylinder, a hollow tube is fixedly connected to the piston plate, one end of the hollow tube is fixedly connected to the lower sampling chamber, an air hole is opened on the outer periphery of the hollow tube near the piston plate, and a one-way valve is provided in the hollow tube.

[0009] Preferably, the piston plate divides the sealing cylinder into an upper chamber and a lower chamber, the air hole is connected to the lower chamber, and the sealing cylinder located in the lower chamber is fixedly connected with an exhaust pipe 2 and an intake pipe 2, respectively. The intake pipe 2 is connected to the upper end of the upper sampling chamber, and a one-way valve is respectively provided in the exhaust pipe 2 and the intake pipe 2.

[0010] Preferably, an exhaust pipe 1 and an intake pipe 1 are fixedly connected to the sealing cylinder located in the upper chamber, the exhaust pipe 1 leads to the outside of the upper shell, the intake pipe 1 is connected to the upper shell, and a one-way valve is respectively provided in the exhaust pipe 1 and the intake pipe 1.

[0011] Furthermore, one end of the support arm is rotatably connected to the lower shell through a torsion spring, a side groove is provided on the outer periphery of the upper shell, one end of the support arm is located in the side groove, and a solid sample feeding chamber is provided at the front end of the support arm.

[0012] Preferably, a U-shaped frame is fixedly connected to the outer periphery of the upper shell, and the horizontal plate of the U-shaped frame extends to the connection between the support arm and the lower shell.

[0013] Furthermore, a spring is fixedly connected to the top wall of the side groove, a block is fixedly connected to the spring, the block corresponds to the open end of the solid sample feeding chamber, and guide rails are fixedly connected to the inner walls on both sides of the side groove, and the block is slidably connected to the guide rails.

[0014] Preferably, a drainage hole is provided on the side wall of the support arm of the solid sample feeding chamber.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] 1. This fixed-point closed sampling device has an upper and lower shell with an adjustable span structure formed by airbag telescopic columns and tension springs. Increasing the span during sinking can reduce the risk of center of gravity shift, significantly improving the stability of the device in deep-hole water flow, and avoiding depth deviation caused by large swings. Reducing the span during sampling can not only accurately extend the waist-shaped liquid inlet out of the lower shell, but also trigger the support arm to automatically deploy, providing a stable structural foundation for subsequent positioning and sampling actions. This "large span sinking-small span sampling" switching takes into account the device's passability and operational accuracy in complex environments.

[0017] 2. In this fixed-point closed sampling device, the support arm cooperates with the horizontal plate of the U-shaped frame through a torsion spring to achieve automatic control of "folding and unfolding": when unfolded, it is in close contact with the inner wall of the deep hole, using the three-point support principle to form a stable positioning to avoid shaking caused by underwater turbulence; at the same time, when the upper shell and the lower shell are close to each other, the piston plate squeezes the gas in the upper chamber and blows it toward the inner wall of the deep hole through the exhaust pipe, removing loose foreign matter and further improving the contact stability of the support arm.

[0018] 3. In this fixed-point closed sampling device, when the piston plate of the sealing cylinder moves up, the gas in the lower sampling chamber and the upper sampling chamber is sucked out through the air hole and the suction pipe respectively, forming a negative pressure to accelerate the entry of liquid, and effectively solve the sampling problem of insufficient water pressure in shallow water environment.

[0019] 4. In this fixed-point closed sampling device, the support arm not only has a positioning function, but the solid sampling chamber at its front end can collect solid samples by scraping against the inner wall of the deep hole when the device is pulled up. The combination of the block and the spring automatically seals the solid sampling chamber when the support arm is retracted to prevent sample leakage. This linkage design of "simultaneous collection of solid samples after liquid sampling is completed" enables the device to achieve "liquid-liquid-solid" multi-phase sample collection without additional operation.

[0020] 5. This fixed-point closed sampling device has a waist-shaped liquid inlet that retracts into the lower shell when sinking to prevent impurities from entering, and retracts into the shell to achieve sealing after sampling; from the one-way valve to prevent sample backflow, to the blocker to seal the solid sampling chamber, the device ensures that the sample is not contaminated through a full-process closed design; at the same time, all actions "span adjustment, support arm retraction and extension, negative pressure suction" are achieved through air pump and mechanical linkage, without the need for additional electrical equipment, reducing the risk of failure in the complex environment of deep holes, and ultimately ensuring the originality of the sample and the accuracy of detection.

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached figure:

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of a fixed-point closed sampling device proposed by the present invention;

[0024] Figure 2 This is a schematic structural diagram of an airbag telescopic column and a tension spring of a fixed-point sealed sampling device proposed by the present invention;

[0025] Figure 3 This is a schematic structural diagram of the support arm and U-shaped frame of a fixed-point closed sampling device proposed by the present invention;

[0026] Figure 4This is a schematic structural diagram of a sealing cylinder, a piston plate, and a hollow tube of a fixed-point sealed sampling device proposed by the present invention;

[0027] Figure 5 This is a schematic structural diagram of a kidney-shaped liquid inlet of a fixed-point sealed sampling device proposed by the present invention;

[0028] Figure 6 This is a structural schematic diagram of a liquid inlet pipe of a fixed-point sealed sampling device proposed by the present invention;

[0029] Figure 7 A fixed-point sealed sampling device proposed by the present invention Figure 6 Enlarged view of point A in the middle;

[0030] Figure 8 This is a structural schematic diagram of the air hole and the air suction pipe 2 of a fixed-point closed sampling device proposed by the present invention;

[0031] Figure 9 This is a schematic diagram of the upper shell and lower shell approaching each other and the support arm unfolding.

[0032] In the figure: 1. Upper shell;

[0033] 11. Sealing cylinder; 111. Piston plate; 1101. Upper chamber; 11011. Exhaust pipe 1; 11012. Intake pipe 1; 1102. Lower chamber; 11021. Intake pipe 2; 11022. Exhaust pipe 2; 112. Hollow tube; 113. Air hole; 114. Airbag telescopic column; 115. Tension spring;

[0034] 12. Upper sampling chamber; 121. Liquid inlet pipe; 122. Kidney-shaped liquid inlet; 123. Lower limit block;

[0035] 2. Lower shell;

[0036] 21. Lower sampling chamber; 22. Sample inlet;

[0037] 3. Support arm; 31. Solid sample chamber; 32. Drain hole;

[0038] 4. Side groove; 41. Block; 42. Spring; 43. Guide rail;

[0039] 5. U-shaped frame; 51. Horizontal board;

[0040] 6. Gravity plate. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0042] The following is combined with Figure 1 -Attached Figure 9 , describes in detail the technical solutions provided by each embodiment of the present invention.

[0043] Example: Refer to Figures 1-9 , a fixed-point closed sampling device, comprising: an upper shell 1 and a lower shell 2 connected to each other, wherein the upper shell 1 and the lower shell 2 are both provided with counterweights, and the counterweights are arranged in the circumferential direction to avoid the center of gravity from shifting. When the upper shell 1 and the lower shell 2 sink, the upper shell 1 and the lower shell 2 move away from each other to extend the span between them. When the upper shell 1 and the lower shell 2 reach the sampling position, the upper shell 1 and the lower shell 2 approach each other to reduce the span between them; an upper sampling chamber 12 is arranged in the upper shell 1; a liquid inlet pipe 121 with a closed end, one end of which is fixedly connected to the upper shell 1 and the other end passes through the lower shell 2, and a waist-shaped liquid inlet port 122 is provided on the outer circumference of the liquid inlet pipe 121. When the sampling position is reached, the waist-shaped liquid inlet port 122 extends from the bottom of the lower shell 2; a support arm 3 is circumferentially arranged on the lower shell 2, and when the upper shell 1 and the lower shell 2 approach each other, the support arm 3 automatically unfolds and contacts the inner wall of the sampling position, and automatically retracts the support arm 3 when the sampling is completed.

[0044] An airbag telescopic column 114 is fixedly connected between the upper shell 1 and the lower shell 2. A tension spring 115 is provided on the airbag telescopic column 114. The two ends of the tension spring 115 are respectively connected to the upper shell 1 and the lower shell 2. The upper end of the airbag telescopic column 114 is connected to an air pipe, which is connected to the air pump. The air pipe has a certain length and can meet the depth of fixed-point sampling.

[0045] In this device, the upper shell 1 and the lower shell 2 are connected by an airbag telescopic column 114 and a tension spring 115 to form a main structure with adjustable span. The airbag telescopic column 114 is connected to a ground air pump through an air pipe, and the extension and contraction of the airbag telescopic column 114 can be controlled by air pressure. The tension spring 115 provides contraction tension to ensure that the upper shell 1 and the lower shell 2 quickly approach each other.

[0046] When in use, air is injected into the three circumferentially arranged airbag telescopic columns 114 in advance through an air pump, and the airbag telescopic columns 114 are extended, so that the distance between the upper shell 1 and the lower shell 2 is increased, thereby extending the span between the upper shell 1 and the lower shell 2;

[0047] A rope is connected to the upper shell 1, and the device is sunk into a pre-drilled deep hole at a designated sampling position. Due to the large span between the upper shell 1 and the lower shell 2, better stability can be obtained during sinking to prevent the device from swinging significantly. At the same time, the waist-shaped liquid inlet 122 of the liquid inlet pipe 121 is retracted into the lower shell 2 to prevent impurities from entering during the sinking process, and the support arm 3 remains in a retracted state under the constraint of the side groove 4, reducing the outer diameter of the device to facilitate entry into the deep hole.

[0048] By loosening the rope, the device sinks to the specified sampling depth, and then the gas in the airbag telescopic column 114 is released through the trachea, causing the airbag telescopic column 114 to retract, and under the tension of the tension spring 115, the upper shell 1 and the lower shell 2 are brought closer to each other. During the approach process, the three support arms 3 circumferentially arranged on the lower shell 2 are automatically unfolded under the drive of the torsion spring and contact the inner wall of the deep hole. At the same time, the end of the liquid inlet pipe 121 extends outward from the bottom of the lower shell 2, so that the waist-shaped liquid inlet 122 of the liquid inlet pipe 121 extends from the bottom of the lower shell 2. Under the action of water pressure, the liquid enters the liquid inlet pipe 121 through the waist-shaped liquid inlet 122 and enters the upper sampling chamber 12 to complete the sampling.

[0049] The deployment of the support arm 3 realizes the stable positioning of the device, which can complete the sampling work at the specified depth more accurately, and improves the impact resistance of the device to avoid the upper shell 1 and the lower shell 2 from shaking and floating due to underwater turbulence.

[0050] When sampling is completed, the air pump inflates the airbag telescopic column 114 again, the distance between the upper shell 1 and the lower shell 2 increases, the support arm 3 re-enters the side groove 4 and is constrained and retracted, and at the same time, the waist-shaped liquid inlet 122 retracts into the lower shell 2, and the waist-shaped liquid inlet 122 is blocked to avoid sample leakage in the process of pulling out the upper shell 1 and the lower shell 2. Then, the device is pulled out of the water, and the corresponding plug cover is removed to easily remove the liquid sample in the upper sampling chamber 12.

[0051] In some embodiments, reference Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 A lower sampling chamber 21 is fixedly connected to the lower shell 2 , and a sampling port 22 is opened on one side of the lower sampling chamber 21 close to the liquid inlet pipe 121 , and the sampling port 22 corresponds to the waist-shaped liquid inlet 122 .

[0052] When the kidney-shaped liquid inlet 122 extends out of the bottom of the lower shell 2, the upper shell 1 contacts the lower shell 2. At this time, half of the kidney-shaped liquid inlet 122 extends out of the lower shell 2, and the other half overlaps with the sampling port 22. At this time, water enters the upper sampling chamber 12 and the lower sampling chamber 21 respectively, realizing multi-chamber sampling and improving sample diversity.

[0053] By opening the plug cover of the lower sampling chamber 21 , the liquid sample in the lower sampling chamber 21 can be easily taken out.

[0054] In some embodiments, reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9A sealing cylinder 11 is fixedly connected to the upper shell 1, and a hollow tube 112 with a piston plate 111 at one end is slidably connected to the sealing cylinder 11. One end of the hollow tube 112 is connected to the lower sampling chamber 21. An air hole 113 is opened on the outer periphery of the hollow tube 112 near the piston plate 111, and a one-way valve is provided in the hollow tube 112 near the lower sampling chamber 21;

[0055] When the lower housing 2 approaches the upper housing 1, the hollow tube 112 pushes the piston plate 111 to slide upward in the sealing cylinder 11. During this process, the gas in the lower sampling chamber 21 connected to the hollow tube 112 is sucked through the air hole 113, reducing the air pressure in the lower sampling chamber 21. Subsequently, when the kidney-shaped liquid inlet 122 extends out of the lower housing 2, the liquid can enter the lower sampling chamber 21 more quickly.

[0056] Since the hollow tube 112 is located at the top of the lower sampling chamber 21 and a one-way valve is provided in the hollow tube 112 , the one-way valve is a duckbill structure. When the piston plate 111 stops moving upward, the one-way valve closes, and the liquid entering the lower sampling chamber 21 will not enter the sealing cylinder 11 through the hollow tube 112 .

[0057] In some embodiments, reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 The piston plate 111 separates the sealing cylinder 11 into an upper chamber 1101 and a lower chamber 1102. The air hole 113 is connected to the lower chamber 1102. The sealing cylinder 11 located in the lower chamber 1102 is fixedly connected with an exhaust pipe 11022 and an intake pipe 11021. The intake pipe 11021 is connected to the upper end of the upper sampling chamber 12. One-way valves are respectively provided in the exhaust pipe 11022 and the intake pipe 11021. The one-way valve in the intake pipe 11021 is located in the intake pipe 11021 near the upper sampling chamber 12, and the one-way valve in the intake pipe 11021 is a duckbill structure.

[0058] An exhaust pipe 11011 and an intake pipe 11012 are fixedly connected to the sealing cylinder 11 located in the upper chamber 1101. The exhaust pipe 11011 leads to the outside of the upper shell 1, and the intake pipe 11012 is connected to the upper shell 1. A one-way valve is respectively provided in the exhaust pipe 11011 and the intake pipe 11012.

[0059] When the specified sampling depth is reached, the airbag telescopic column 114 is deflated, and the distance between the upper shell 1 and the lower shell 2 is reduced, causing the piston plate 111 to move upward, and the gas sucked through the air hole 113 enters the lower chamber 1102. At the same time, the piston plate 111 squeezes the gas in the upper chamber 1101, and the gas in the upper chamber 1101 is discharged through the exhaust pipe 11011. The discharged gas is blown toward the inner wall of the deep hole, and the gas can remove loose foreign matter on the inner wall of the deep hole, thereby improving the stability of the contact between the support arm 3 and the inner wall of the deep hole.

[0060] As the piston plate 111 moves upward, the gas in the upper sampling chamber 12 is sucked into the lower chamber 1102 through the second suction pipe 11021, thereby reducing the air pressure in the upper sampling chamber 12 and further increasing the liquid inlet speed.

[0061] Since the end of the second suction pipe 11021 away from the sealing cylinder 11 is located at the upper end of the upper sampling chamber 12, and a one-way valve is provided in the second suction pipe 11021, when the piston plate 111 stops moving upward, the one-way valve will close, and the liquid entering the upper sampling chamber 12 will not enter the sealing cylinder 11 through the second suction pipe 11021.

[0062] Therefore, the provision of the sealing cylinder 11 can accelerate the entry of liquid during the sampling operation, thereby improving the sampling efficiency and success rate.

[0063] When the sampling is completed, gas is injected into the airbag telescopic column 114, the upper shell 1 and the lower shell 2 move away from each other, the piston plate 111 moves downward, and the gas in the upper shell 1 is sucked into the upper chamber 1101 through the suction pipe 11021, and the gas in the lower chamber 1102 is discharged into the upper shell 1 through the exhaust pipe 11022.

[0064] To sum up, the setting of the sealing cylinder 11 can be used to suck the gas in the upper sampling chamber 12 and the lower sampling chamber 21, thereby accelerating the liquid inlet speed. It can also discharge the gas through the exhaust pipe 11011 by bringing the upper shell 1 and the lower shell 2 close to each other, perform foreign body removal operations on the inner wall of the deep hole, strengthen the supporting strength of the support arm 3 to the upper shell 1 and the lower shell 2, and thereby improve the accuracy of fixed-point depth sampling.

[0065] In some embodiments, reference Figure 5 、 Figure 6 、 Figure 8 、 Figure 9 One end of the support arm 3 is rotatably connected to the lower shell 2 through a torsion spring. A side groove 4 is provided on the outer periphery of the upper shell 1. One end of the support arm 3 is located in the side groove 4. A solid sample loading chamber 31 is provided at the front end of the support arm 3.

[0066] After the liquid sampling is completed, the device is first pulled upward as a whole, and then air is injected into the airbag telescopic column 114. Therefore, when pulling, the support arm 3 in contact with the inner wall of the deep hole will scrape against the inner wall of the deep hole, and the solid matter on the inner wall of the deep hole will enter the solid sampling chamber 31. The upward pulling stroke can be adjusted according to the actual situation.

[0067] It should be noted that during the solid sampling process, if the upward pulling resistance is too large, gas can be injected into the airbag telescopic column 114 to push the upper shell 1 and the lower shell 2 to separate, so that the support arm 3 is retracted to prevent the support arm 3 from being stuck in the inner wall of the deep hole. At the same time, the solid sampling operation can be completed during the retraction process of the support arm 3; and the inflation and deflation operations can be repeated to accelerate the completion of solid sampling.

[0068] In one embodiment, when the rope used to connect the device is connected to the upper shell 1, a magnetic block is provided at the position where the upper shell 1 and the lower shell 2 are close to and in contact with each other, so that when the upper pulling device is used for solid sampling, the upper shell 1 and the lower shell 2 are adsorbed on each other, thereby avoiding the support arm 3 from scratching the inner wall, which causes the lower shell 2 to be forced to separate from the upper shell 1, resulting in poor sampling.

[0069] In one embodiment, the rope is connected to the lower housing 2 , so that during the solid sampling operation, pulling up the lower housing 2 can drive the support arm 3 to directly bear force to perform solid sampling.

[0070] In one embodiment, reference Figure 9 The outer side of the upper end of the support arm 3 is rotatably connected to a gravity plate 6. When the support arm 3 is located in the side groove 4, the gravity plate 6 is parallel to the support arm 3. When the support arm 3 is unfolded, the gravity plate 6 tends to be parallel to the upper shell 1 and the lower shell 2 under its own weight, so that the gravity plate 6 is attached to the inner wall of the deep hole to increase the contact area;

[0071] In addition, according to Figure 9 It can be seen that when the outer wall of the gravity plate 6 and the top of the support arm 3 are in contact with the inner wall of the deep hole, the lateral distance between the gravity plate 6 and the inner wall of the deep hole is greater than the lateral distance between the support arm 3 and the inner wall of the deep hole. Therefore, when the gravity plate 6 is in contact with the inner wall of the deep hole, the gravity plate 6 will limit the front end of the support arm 3 from being inserted too deeply into the inner wall of the deep hole. Therefore, the gravity plate 6 can limit the front end of the support arm 3 from being inserted too deeply into the inner wall of the deep hole. Therefore, when the upper shell 1 and the lower shell 2 are pulled up, the support arm 3 will not be stuck in the inner wall of the deep hole, thereby avoiding unsuccessful solid sampling.

[0072] Therefore, the support arm 3 of the device can not only be used to support the upper shell 1 and the lower shell 2, but also be used to collect and sample solid objects.

[0073] When the upward pulling stroke reaches the set stroke, air is injected into the airbag telescopic column 114 , the upper shell 1 and the lower shell 2 move away from each other, and the support arm 3 retracts into the side groove 4 .

[0074] In some embodiments, reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 9 , a U-shaped frame 5 is fixedly connected to the outer periphery of the upper shell 1, and the horizontal plate 51 of the U-shaped frame 5 extends to the connection between the support arm 3 and the lower shell 2;

[0075] The support arm 3 retracts and extends when the upper shell 1 and the lower shell 2 approach each other, and the support arm 3 follows the lower shell 2 to change position. The rotation connection between the support arm 3 and the lower shell 2 passes over the horizontal plate 51 of the U-shaped frame 5. At this time, the support arm 3 is no longer blocked by the U-shaped frame 5 and is automatically extended under the drive of the torsion spring.

[0076] When the upper shell 1 and the lower shell 2 move away from each other, the outer periphery of the lower end of the support arm 3 contacts the upper horizontal plate 51 of the U-shaped frame 5. The support arm 3 is automatically retracted toward the side groove 4 due to the obstruction of the horizontal plate 51. In addition, since the upper shell 1 and the lower shell 2 can move away from each other, the support arm 3 that contacts the inner wall of the deep hole can also move downward, so as to prevent the support arm 3 from contacting the inner wall too deeply and being unable to retract.

[0077] Therefore, the support arm 3 in the device does not require additional electrical equipment for control, and can be automatically expanded or retracted according to the adjustment of the distance between the upper shell 1 and the lower shell 2.

[0078] In some embodiments, reference Figure 1 、 Figure 5 、 Figure 8 、 Figure 9 The top wall of the side groove 4 is fixedly connected to a spring 42, and a blocking block 41 is fixedly connected to the spring 42. The blocking block 41 corresponds to the open end of the solid sample feeding chamber 31. The inner walls on both sides of the side groove 4 are fixedly connected to guide rails 43, and the blocking block 41 is slidably connected to the guide rails 43;

[0079] The function of the blocking block 41 is to block the opening of the solid sample inlet chamber 31 after the solid sample is collected in the solid sample inlet chamber 31 and the support arm 3 is retracted into the side groove 4 to prevent the solid sample from leaking out.

[0080] Specifically, when the upper shell 1 and the lower shell 2 approach each other, the blocking block 41 is pushed upward before the rotational connection between the support arm 3 and the lower shell 2 passes over the horizontal plate 51 of the U-shaped frame 5. Then, when the rotational connection between the support arm 3 and the lower shell 2 passes over the horizontal plate 51, the support arm 3 is extended under the reset action of the torsion spring, and the blocking block 41 moves downward and resets.

[0081] When the upper shell 1 and the lower shell 2 move away from each other, the support arm 3 retracts toward the side groove 4. When the upper shell 1 and the lower shell 2 move away from each other and reach the maximum stroke, the support arm 3 is completely retracted into the side groove 4, and the open end of the solid sample feeding chamber 31 contacts the block 41.

[0082] It should be understood that the block 41 slides in the guide rail 43, and the maximum downward stroke of the block 41 on the guide rail 43 enables the block 41 to block the open end of the solid sample loading chamber 31, and the support arm 3 will not be unable to be retracted into the side groove 4 due to the block 41 moving downward too far, thereby avoiding exposure of the solid sample.

[0083] Reference Figure 6 A drainage hole 32 is provided on the side wall of the support arm 3 of the solid sample feeding chamber 31 . The drainage hole 32 is provided to drain the water in the solid sample feeding chamber 31 when the solid sample enters the solid sample feeding chamber 31 .

[0084] In one embodiment, reference Figure 9 A lower limit block 123 is installed at the end of the liquid inlet pipe 121, and the lower limit block 123 is used to limit the extension stroke of the airbag telescopic column 114 after gas injection.

[0085] In addition, the device can also be used in deep pipelines in industrial equipment, geological drilling exploration, underwater oil exploration, etc.

[0086] When operating in a deep pipe, since the pipe is made of hard material, the support arm 3 can directly scrape the inner wall of the pipe to sample the attached matter when performing solid operations;

[0087] In geological drilling exploration and underwater oil exploration, this device can also be operated according to the actual underwater geological conditions to complete liquid and solid sampling.

[0088] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A fixed-point closed sampling device, characterized in that: include: The upper shell (1) and the lower shell (2) are connected. When the upper shell (1) and the lower shell (2) sink, the upper shell (1) and the lower shell (2) move away from each other to extend the span between them. When the upper shell (1) and the lower shell (2) reach the sampling position, the upper shell (1) and the lower shell (2) move closer to each other to reduce the span between them. An upper sampling chamber (12) is arranged in the upper housing (1); A liquid inlet pipe (121) with a closed end has one end fixedly connected to the upper shell (1) and the other end passing through the lower shell (2). A waist-shaped liquid inlet port (122) is provided on the outer periphery of the liquid inlet pipe (121). When the sampling position is reached, the waist-shaped liquid inlet (122) extends from the bottom of the lower housing (2); A support arm (3) is circumferentially arranged on the lower housing (2). When the upper shell (1) and the lower shell (2) approach each other, the support arm (3) automatically unfolds and contacts the inner wall of the sampling position, and when the sampling is completed, the support arm (3) automatically retracts and unfolds; One end of the support arm (3) is rotatably connected to the lower shell (2) via a torsion spring, a side groove (4) is provided on the outer periphery of the upper shell (1), and one end of the support arm (3) is located in the side groove (4); A U-shaped frame (5) is fixedly connected to the outer periphery of the upper shell (1), and the transverse plate (51) of the U-shaped frame (5) extends to the connection between the support arm (3) and the lower shell (2).

2. A fixed-point sealed sampling device according to claim 1, characterized in that: An airbag telescopic column (114) is fixedly connected between the upper shell (1) and the lower shell (2), a tension spring (115) is sleeved on the airbag telescopic column (114), and two ends of the tension spring (115) are respectively connected to the upper shell (1) and the lower shell (2).

3. A fixed-point sealed sampling device according to claim 2, characterized in that: A lower sampling chamber (21) is fixedly connected to the lower housing (2), and a sampling port (22) is provided on a side of the lower sampling chamber (21) close to the liquid inlet pipe (121), and the sampling port (22) corresponds to the waist-shaped liquid inlet (122).

4. A fixed-point sealed sampling device according to claim 3, characterized in that: A sealing cylinder (11) is fixedly connected to the upper shell (1), a piston plate (111) is slidably connected to the sealing cylinder (11), a hollow tube (112) is fixedly connected to the piston plate (111), one end of the hollow tube (112) is connected to the lower sampling chamber (21), an air hole (113) is opened on the outer periphery of the hollow tube (112) near the piston plate (111), and a one-way valve is provided in the hollow tube (112).

5. A fixed-point sealed sampling device according to claim 4, characterized in that: The piston plate (111) separates the sealing cylinder (11) into an upper chamber (1101) and a lower chamber (1102); the air hole (113) is connected to the lower chamber (1102); an exhaust pipe 2 (11022) and an intake pipe 2 (11021) are fixedly connected to the sealing cylinder (11) located in the lower chamber (1102); the intake pipe 2 (11021) is connected to the upper end of the upper sampling chamber (12); and a one-way valve is provided in the exhaust pipe 2 (11022) and the intake pipe 2 (11021), respectively.

6. A fixed-point sealed sampling device according to claim 5, characterized in that: An exhaust pipe 1 (11011) and an intake pipe 1 (11012) are fixedly connected to the sealing cylinder (11) located in the upper chamber (1101), respectively. The exhaust pipe 1 (11011) leads to the outside of the upper shell (1), and the intake pipe 1 (11012) is connected to the upper shell (1). One-way valves are respectively provided in the exhaust pipe 1 (11011) and the intake pipe 1 (11012).

7. A fixed-point sealed sampling device according to claim 1 or 6, characterized in that: A solid sample feeding chamber (31) is provided at the front end of the support arm (3).

8. A fixed-point sealed sampling device according to claim 7, characterized in that: The top wall of the side groove (4) is fixedly connected to a spring (42), and a blocking block (41) is fixedly connected to the spring (42). The blocking block (41) corresponds to the open end of the solid sample feeding chamber (31). Guide rails (43) are fixedly connected to the inner walls on both sides of the side groove (4), and the blocking block (41) is slidably connected to the guide rails (43).

9. A fixed-point sealed sampling device according to claim 8, characterized in that: A drainage hole (32) is provided on the side wall of the support arm (3) located at the solid sample feeding chamber (31).

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