Automatic liquid sampling device and method
By introducing components such as samplers, closed sampling bottles, negative pressure tubes into the liquid sampling device, and using PLC control to realize flow monitoring and volume calculation, the problems of low sampling accuracy and high cost in the existing devices are solved, and high-precision and low-cost automatic sampling is achieved.
Patent Information
- Application Number
- CN202510601096.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2025-08-01
AI Technical Summary
The existing closed liquid sampling devices have problems such as low sampling accuracy, lack of flow monitoring, inability to calculate the liquid volume in the sampling bottle in real time, needing to be equipped with special gas adsorption devices and complex structures, resulting in high costs.
Using components such as samplers, closed sampling bottles, negative pressure tubes, electronic flowmeters, liquid sensors and pressure sensors, flow monitoring and real-time calculation of sampling volume and gas treatment through PLC control, simplifying the structure and reducing costs.
Improve sampling accuracy, realize flow monitoring and real-time volume calculation, simplify structure and reduce costs.
Smart Images
Figure CN120404246A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of liquid sampling, and particularly relates to a liquid automatic sampling device and method. Background Art
[0002] Currently, the main components of the existing closed liquid sampling device include a medium inlet valve, a nitrogen purge valve, a purge pressure gauge, a gas source regulating valve, a sampling cup, an adsorption tank, a diaphragm pump, a sight glass, and a reversing valve. On the sampling pipeline between the medium inlet and the medium outlet, the diaphragm pump, the medium inlet valve, the reversing valve, and the sight glass are arranged in sequence; the compressed air gas source outlet and the nitrogen gas source outlet are respectively connected to the purge pipeline inlet through the gas source regulating valve. On the pipeline between the purge pipeline inlet and the purge pipeline outlet, the nitrogen purge valve and the purge pressure gauge are arranged in sequence, and the purge pipeline outlet is communicated with the pipeline of the medium inlet valve outlet; the top outlet of the sampling cup is connected to the adsorption tank through a pipeline.
[0003] The above-mentioned type of device has the ability to sample in a closed environment, and the adsorption device therein can effectively adsorb the volatile gases generated during the sampling process; the purge device can ensure that the pipeline remains clean, avoiding material waste and gas volatilization. However, this device still has many deficiencies: firstly, the sampling accuracy needs to be improved; secondly, there is a lack of flow monitoring throughout the sampling process; thirdly, it is impossible to calculate the volume of the liquid in the sampling bottle in real time; fourthly, a special gas adsorption device needs to be equipped to handle the volatile gases; fifthly, the structure is relatively complex, resulting in a high cost. Summary of the Invention
[0004] The purpose of the present invention is to provide a liquid automatic sampling device and method to solve the problems existing in the above-mentioned prior art.
[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: In the first aspect, the present invention provides a liquid automatic sampling device, including a sample tank, and the liquid automatic sampling device further includes: A sampler, which includes a sampling cavity, a telescopic cylinder installed at the bottom of the sampling cavity, and a piston connected to the telescopic end of the telescopic cylinder, the piston can move up and down in the sampling cavity, and the first interface at the top of the sampling cavity is communicated with the sample tank through a manual ball valve; A closed sampling bottle, which is placed on a platform scale, and the second interface on the side wall of the sampling cavity is communicated with the inside of the closed sampling bottle through a connecting pipe; and A negative pressure pipe, the top of which is connected to an external vacuum pump through an electromagnetic ball valve, and the bottom of which is communicated with the top of the closed sampling bottle; Wherein, an electronic flowmeter is installed on the connecting pipe, and a liquid sensor and a pressure sensor are installed on the negative pressure pipe.
[0006] In a possible implementation, the bottom end of the negative pressure pipe is connected to the top of the sealed sampling bottle through a first dry joint.
[0007] In a possible implementation, the second interface on the side wall of the sampling cavity is connected to the connecting pipe through a second dry joint.
[0008] In a possible implementation, the telescopic cylinder is equipped with a displacement sensor to judge the position of the piston and prevent sample leakage caused by abnormal position of the piston.
[0009] In a possible implementation, the telescopic cylinder is a pneumatic cylinder, and the pneumatic cylinder is equipped with an air lock, which is unlocked when ventilated and locked when the air supply is cut off to prevent the cylinder from displacing, so as to prevent the piston from sliding down and causing the sample in the sample tank to leak into the sealed sampling bottle.
[0010] In a possible implementation, the telescopic cylinder is an electric cylinder, and the electric cylinder is equipped with self-locking, which is unlocked when powered on and locked when powered off to prevent the cylinder from displacing, so as to prevent the piston from sliding down and causing the sample in the sample tank to leak into the sealed sampling bottle.
[0011] In a possible implementation, the telescopic cylinder is a hydraulic cylinder, and the hydraulic cylinder is equipped with self-locking, which is unlocked when the hydraulic cylinder moves and locked when the hydraulic cylinder stops moving to prevent the cylinder from displacing, so as to prevent the piston from sliding down and causing the sample in the sample tank to leak into the sealed sampling bottle.
[0012] In a possible implementation, an externally threaded through-wall pipe is provided on the bottle cap of the sealed sampling bottle, and the connecting pipe can pass through the externally threaded through-wall pipe and extend into the interior of the sealed sampling bottle to prevent the sample from being sucked into the negative pressure pipe at the bottle mouth.
[0013] In a second aspect, the present invention provides a method for automatic liquid sampling, which is applied to the above-mentioned automatic liquid sampling device, and the method includes: Preparation stage: Before starting sampling, the external PLC checks the pressure feedback by the pressure sensor on the negative pressure pipe according to a preset program or instruction to ensure that the device is in a normal state; at this time, the telescopic cylinder is in a locked state to prevent sample leakage caused by the piston sliding down; Sampling stage: The external PLC controls the telescopic cylinder to unlock and pull down the piston to the bottom of the sampling cavity; the sample in the sample tank flows into the sealed sampling bottle through the manual ball valve, the sampling cavity and then the connecting pipe under the action of gravity; the electronic flowmeter on the connecting pipe monitors the sample flow in real time for calculating the sampling volume; the platform scale monitors the weight of the sealed sampling bottle in real time, and the external PLC calculates the relationship between weight and volume according to the preset feeding parameters to avoid sample overflow; Gas treatment stage: The external vacuum pump is started, and the volatilized gas in the sealed sampling bottle is extracted through the negative pressure pipe; the liquid sensor and the pressure sensor monitor the liquid and pressure conditions in the negative pressure pipe in real time. If there is any abnormality in the liquid or pressure, the external PLC controls the electromagnetic ball valve to close quickly to prevent the leakage of dangerous sample liquid; Sampling end: When the scale shows that the sample amount in the sealed sampling bottle reaches the preset value, the external PLC controls the telescopic cylinder to push up the piston to stop sampling; at this time, the connection between the sampler and the sample tank can be cut off by closing the manual ball valve, which is convenient for maintaining the sampler and avoiding sample waste; Post-treatment: Manually remove the sealed sampling bottle to complete one sampling. The device can repeat the above process according to the preset time interval or command to realize automatic sampling of the sample.
[0014] The beneficial effects brought by the technical solution provided by the present invention at least include: The present technical solution is provided with a sampler and a sealed sampling bottle. The sampler includes a sampling cavity, a telescopic cylinder installed at the bottom of the sampling cavity, and a piston connected to the telescopic end of the telescopic cylinder. The first interface at the top of the sampling cavity is connected to the sample tank through a manual ball valve; the sealed sampling bottle is placed on a scale, and the second interface on the side wall of the sampling cavity is connected to the inside of the sealed sampling bottle through a connecting pipe. The top of the sealed sampling bottle is connected to the bottom end of the negative pressure pipe, and the top end of the negative pressure pipe is connected to an external vacuum pump through an electromagnetic ball valve; wherein, an electronic flow meter is installed on the connecting pipe, and a liquid sensor and a pressure sensor are installed on the negative pressure pipe. In this case, the sampling accuracy is improved, the flow monitoring during the sampling process is realized, the volume of the sample in the sampling bottle can be calculated in real time, the volatile gas can be processed through the negative pressure pipe, the overall structure is simple, and the cost is low. Description of the Drawings
[0015] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.
[0016] Figure 1 Fig. shows the structural schematic diagram of the liquid automatic sampling device provided by an exemplary embodiment of the present invention.
[0017] Figure 2 Fig. shows the flow schematic diagram of the liquid automatic sampling method provided by an exemplary embodiment of the present invention.
[0018] In the figure: 1. Sample tank; 2. Sampler; 21. Sampling cavity; 22. Telescopic cylinder; 23. Piston; 24. First interface; 25. Second interface; 3. Manual ball valve; 4. Hermetic sampling bottle; 5. Platform scale; 6. Connecting pipe; 7. Negative pressure pipe; 8. Electromagnetic ball valve; 9. Electronic flowmeter; 10. Liquid sensor; 11. Pressure sensor; 12. First dry joint; 13. Second dry joint; 14. External thread through-wall pipe. Detailed implementation mode
[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0020] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings of the specification of the present invention, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions towards or away from specific components. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the specification of the present invention, the meaning of "a plurality" is two or more.
[0021] The present invention will be further described in conjunction with the accompanying drawings and embodiments.
[0022] Figure 1 [[ID=IS]]The structural schematic diagram of a liquid automatic sampling device provided by an exemplary embodiment of the present invention is shown. The liquid automatic sampling device includes a sampler 2 and a hermetic sampling bottle 4. The sampler 2 includes a sampling cavity 21, a telescopic cylinder 22 installed at the bottom of the sampling cavity 21, and a piston 23 connected to the telescopic end of the telescopic cylinder 22. The piston 23 can move up and down in the sampling cavity 21. The first interface २५ at the top of the sampling cavity २१ is connected to the sample tank १ through a manual ball valve ३; the hermetic sampling bottle ४ is placed on a platform scale ५, and the second interface २५ on the side wall of the sampling cavity २१ is connected to the inside of the hermetic sampling bottle ४ through a connecting pipe ६. The top of the hermetic sampling bottle ४ is connected to the bottom end of a negative pressure pipe ७, and the top end of the negative pressure pipe ७ is connected to an external vacuum pump through an electromagnetic ball valve ८; among them, an electronic flowmeter ९ is installed on the connecting pipe ६, and a liquid sensor १० and a pressure sensor ११ are installed on the negative pressure pipe ७.
[0023] It is worth mentioning that the above telescopic cylinder 22, platform scale 5, electromagnetic ball valve 8, electronic flowmeter 9, liquid sensor 10, and pressure sensor 11 are all connected to an external PLC to achieve coordinated control during the operation of the liquid automatic sampling device.
[0024] In the embodiment of the present application, the piston 23 can be pulled down to the bottom of the sampling cavity 21 by the telescopic cylinder 22, and the sample in the sample tank 1 automatically flows into the connecting pipe 6 under the action of gravity and then flows from the connecting pipe 6 into the sealed sampling bottle 4. The platform scale 5 can monitor the weight of the sealed sampling bottle 4 in real time. The platform scale 5 is linked with the external PLC, and the PLC automatically calculates the relationship between weight and volume according to the feeding parameters, reducing the risk of sample overflow in the sealed sampling bottle 4. The electronic flowmeter 9 installed on the connecting pipe 6 between the sampler 2 and the sealed sampling bottle 4 can monitor the sample flow through the connecting pipe 6, thereby calculating the sampling volume and reducing the risk of sample overflow in the sealed sampling bottle 4. When the sampler 2 needs to be maintained, the connection with the sample tank 1 can be cut off through the manual ball valve 3 above it, without causing waste of the sample flowing out of the sample tank 1.
[0025] In the embodiment of the present application, when the external vacuum pump starts, the negative pressure pipe 7 can extract the volatilized gas in the sealed sampling bottle 4. The liquid sensor 10 and the pressure sensor 11 can detect whether there is sample liquid in the negative pressure pipe 7 and monitor whether the pressure in the negative pressure pipe 7 is abnormal. Once it is found that there is sample liquid in the negative pressure pipe 7 or the pressure in the negative pressure pipe 7 is abnormal, the electromagnetic ball valve 8 is immediately closed. The electromagnetic ball valve 8 can quickly complete the fully closed action. In the closed state, the sphere completely blocks the sample channel and forms a mechanical seal barrier to prevent the leakage of dangerous sample liquid when the negative pressure fails.
[0026] Furthermore, the bottom end of the negative pressure pipe 7 is connected to the top of the sealed sampling bottle 4 through the first dry joint 12, and the second interface 25 on the side wall of the sampling cavity is connected to the connecting pipe 6 through the second dry joint 13. An externally threaded through-wall pipe 14 is provided on the bottle cap of the sealed sampling bottle 4, and the connecting pipe 6 can pass through the externally threaded through-wall pipe 14 and extend into the interior of the sealed sampling bottle 4 to prevent the sample from being sucked into the negative pressure pipe 7 at the bottle mouth.
[0027] In the embodiment of the present application, the dry joint is divided into male and female joints. When the male and female joints are inserted together, a travel path is formed and the sample can flow. When the male and female joints are separated, two sealed cavities are formed at both ends respectively, achieving zero leakage. It can be replaced without special tools, and standardized parts enable unified inventory management, greatly reducing the spare parts cost. The detachable design of the externally threaded through-wall pipe 14 is convenient for later pipeline maintenance or replacement without damaging the bottle cap structure.
[0028] Furthermore, the telescopic cylinder 22 is equipped with a displacement sensor for judging the position of the piston 23 to prevent sample leakage caused by abnormal position of the piston 23.
[0029] In one example, the telescopic cylinder 22 is a pneumatic cylinder, which is equipped with an air lock. When ventilated, it is unlocked, and when the air supply is cut off, the pneumatic cylinder is locked to prevent displacement, so as to prevent the sample tank 1 from leaking materials into the sealed sampling bottle 4 due to the piston 23 sliding down.
[0030] In another example, the telescopic cylinder 22 is an electric cylinder, which is equipped with self-locking. When powered on, it is unlocked, and when powered off, the electric cylinder is locked to prevent displacement, so as to prevent the sample tank 1 from leaking materials into the sealed sampling bottle 4 due to the piston 23 sliding down.
[0031] In another example, the telescopic cylinder 22 is a hydraulic cylinder, which is equipped with self-locking. When the hydraulic cylinder moves, it is unlocked, and when the hydraulic cylinder stops moving, it is locked to prevent displacement, so as to prevent the sample tank 1 from leaking materials into the sealed sampling bottle 4 due to the piston 23 sliding down.
[0032] Figure 2 The flowchart of the liquid automatic sampling method provided by an exemplary embodiment of the present invention is shown. This liquid automatic sampling method is applied to the liquid automatic sampling device as described above. The method includes: Preparation stage: Before starting sampling, the external PLC checks the pressure feedback by the pressure sensor 11 on the negative pressure pipe 7 according to the preset program or instruction to ensure that the device is in a normal state; at this time, the telescopic cylinder 22 (pneumatic cylinder, electric cylinder or hydraulic cylinder) is in a locked state to prevent sample leakage caused by the piston 23 sliding down.
[0033] Sampling stage: The external PLC controls the telescopic cylinder 22 to unlock and pull down the piston 23 to the bottom of the sampling cavity 21; the sample in the sample tank 1 flows into the sealed sampling bottle 4 through the manual ball valve 3, the sampling cavity 21 and then through the connecting pipe 6 under the action of gravity; the electronic flowmeter 9 on the connecting pipe 6 monitors the sample flow in real time for calculating the sampling volume; the platform scale 5 monitors the weight of the sealed sampling bottle 4 in real time, and the external PLC calculates the weight-volume relationship according to the preset feeding parameters V = m / ρ , and the sample weight is measured in real time by the platform scale m and the densities of different samples ρ , to determine the volume of the sample in the sealed sampling bottle 4 V , to avoid sample overflow.
[0034] Gas treatment stage: The external vacuum pump is started to extract the volatilized gas in the sealed sampling bottle 4 through the negative pressure pipe 7; the liquid sensor 10 and the pressure sensor 11 monitor the liquid and pressure conditions in the negative pressure pipe 7 in real time. If there is liquid or pressure abnormality, the external PLC controls the electromagnetic ball valve 8 to close quickly to prevent the leakage of dangerous sample liquid.
[0035] End of sampling: When the scale 5 shows that the sample amount in the sealed sampling bottle 4 reaches the preset value, the external PLC controls the telescopic cylinder 22 to push up the piston 23 to stop sampling; at this time, the connection between the sampler 2 and the sample tank 1 can be cut off by closing the manual ball valve 3, which facilitates the maintenance of the sampler 2 and avoids sample waste.
[0036] Post-processing: Manually remove the sealed sampling bottle 4 to complete a sampling; the dry joint in the device can achieve zero leakage when connecting and disconnecting, which is convenient for replacement and management; the detachable design of the externally threaded through-wall tube 14 facilitates the later pipeline inspection and replacement; the displacement sensor and locking function of the telescopic cylinder 22 can ensure the normal position of the piston 23 to prevent sample leakage; the device can repeat the above process according to the preset time interval or instruction to realize automatic sampling of samples.
[0037] In summary, the present technical solution is provided with a sampler and a sealed sampling bottle, the sampler includes a sampling cavity, a telescopic cylinder installed at the bottom of the sampling cavity, and a piston connected to the telescopic end of the telescopic cylinder, the first interface at the top of the sampling cavity is connected to the sample tank through a manual ball valve; the sealed sampling bottle is placed on a platform scale, the second interface on the side wall of the sampling cavity is connected to the interior of the sealed sampling bottle through a connecting pipe, the top of the sealed sampling bottle is connected to the bottom end of the negative pressure tube, and the top end of the negative pressure tube is connected to an external vacuum pump through an electromagnetic ball valve; wherein an electronic flow meter is installed on the connecting pipe, and a liquid sensor and a pressure sensor are installed on the negative pressure tube. In this case, the sampling accuracy is improved, flow monitoring during the sampling process is realized, the volume of the sample in the sampling bottle can be calculated in real time, volatile gas can be processed through the negative pressure tube, the overall structure is simple, and the cost is low.
[0038] In the embodiments disclosed herein, terms such as "installed," "connected," "connected," and "fixed" should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; and "connected" may refer to a direct connection or an indirect connection via an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments disclosed herein based on specific circumstances.
[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. An automatic liquid sampling device, comprising a sample tank (1), characterized in that, The liquid automatic sampling device further includes: A sampler (2), which includes a sampling cavity (21), a telescopic cylinder (22) installed at the bottom of the sampling cavity (21), and a piston (23) connected to the telescopic end of the telescopic cylinder (22). The piston (23) can move up and down in the sampling cavity (21). The first interface (24) at the top of the sampling cavity (21) is connected to the sample tank (1) through a manual ball valve (3); A sealed sampling bottle (4), which is placed on a platform scale (5). The second interface (25) on the side wall of the sampling cavity (21) is connected to the inside of the sealed sampling bottle (4) through a connecting pipe (6); and A negative pressure pipe (7), the top of which is connected to an external vacuum pump through an electromagnetic ball valve (8), and the bottom of which is connected to the top of the sealed sampling bottle (4); Wherein, an electronic flowmeter (9) is installed on the connecting pipe (6), and a liquid sensor (10) and a pressure sensor (11) are installed on the negative pressure pipe (7).
2. The liquid automatic sampling device according to claim 1, wherein The bottom end of the negative pressure pipe (7) is connected to the top of the sealed sampling bottle (4) through a first dry joint (12).
3. The liquid automatic sampling device according to claim 1, characterized in that, The second interface (25) on the side wall of the sampling cavity (21) is connected to the connecting pipe (6) through a second dry joint (13).
4. The liquid automatic sampling device according to claim 1, characterized in that, The telescopic cylinder (22) is equipped with a displacement sensor for judging the position of the piston (23) to prevent sample leakage caused by abnormal position of the piston (23).
5. The liquid automatic sampling device according to claim 1, characterized in that The telescopic cylinder (22) is a pneumatic cylinder, and the pneumatic cylinder is equipped with an air lock, which is unlocked when ventilated and locked when the air supply is cut off to prevent the piston (23) from sliding down and causing the sample in the sample tank (1) to leak into the sealed sampling bottle (4).
6. The liquid automatic sampling device according to claim 1, characterized in that, The telescopic cylinder (22) is an electric cylinder, and the electric cylinder is equipped with a self-locking function. It is unlocked when powered on and locked when powered off to prevent the piston (23) from sliding down and causing the sample in the sample tank (1) to leak into the sealed sampling bottle (4).
7. The liquid automatic sampling device according to claim 1, characterized in that The telescopic cylinder (22) is a hydraulic cylinder, and the hydraulic cylinder is equipped with a self-locking function. It is unlocked when the hydraulic cylinder moves and locked when the hydraulic cylinder stops moving to prevent the piston (23) from sliding down and causing the sample in the sample tank (1) to leak into the sealed sampling bottle (4).
8. The liquid automatic sampling device according to claim 1, characterized in that, An externally threaded through-wall pipe (14) is provided on the bottle cap of the sealed sampling bottle (4). The connecting pipe (6) can pass through the externally threaded through-wall pipe (14) and extend into the inside of the sealed sampling bottle (4) to prevent the sample from being sucked into the negative pressure pipe (7) at the bottle mouth.
9. A liquid automatic sampling method, which is applied to the liquid automatic sampling device according to any one of claims 1 to 8, and is characterized in that, The method includes: Preparation stage: Before starting sampling, the external PLC checks the pressure feedback by the pressure sensor on the negative pressure pipe according to a preset program or instruction to ensure that the device is in a normal state; at this time, the telescopic cylinder is in a locked state to prevent the piston from sliding down and causing sample leakage; Sampling stage: The external PLC controls the unlocking of the telescopic cylinder and pulls down the piston to the bottom of the sampling cavity; under the action of gravity, the sample in the sample tank flows through the manual ball valve, the sampling cavity, and then into the sealed sampling bottle through the connecting pipe; the electronic flowmeter on the connecting pipe monitors the sample flow in real time for calculating the sampling volume; the platform scale monitors the weight of the sealed sampling bottle in real time, and the external PLC calculates the relationship between weight and volume according to the preset feeding parameters to avoid sample overflow; Gas treatment stage: The external vacuum pump is started to extract the volatile gas in the sealed sampling bottle through the negative pressure pipe; the liquid sensor and the pressure sensor monitor the liquid and pressure conditions in the negative pressure pipe in real time. If there is any liquid or pressure abnormality, the external PLC controls the solenoid ball valve to close quickly to prevent the leakage of dangerous sample liquid; Sampling end: When the platform scale shows that the sample volume in the sealed sampling bottle reaches the preset value, the external PLC controls the telescopic cylinder to push up the piston to stop sampling; at this time, the connection between the sampler and the sample tank can be cut off by closing the manual ball valve, which is convenient for maintaining the sampler and avoiding sample waste; Post-treatment: Manually remove the sealed sampling bottle to complete one sampling. The device can repeat the above process according to the preset time interval or command to achieve automatic sampling of the sample.