Pneumatic sampler

Abstract

The utility model belongs to the technical field of pneumatic sampling, particularly relates to a pneumatic sampler, and provides the following scheme aiming at the problem that the requirements of no old sample residue pollution and unmanned automatic sampling cannot be simultaneously met in the prior art: the pneumatic sampler comprises a material pipeline; the pressure balancing opening is formed in the upper part of the outer wall of the material pipeline, the pressure balancing opening in the material pipeline is communicated with a venturi tube, the venturi tube can realize sampling negative pressure, and an air return valve is arranged on the venturi tube; the air supply valve is arranged at one end far away from the material pipeline, an air source circulates in the air supply valve, and the air supply valve is used for controlling the air source. The quantitative sampling device is simple in structure, capable of automatically and quantitatively sampling on a gravity conveying pipeline, a pressure conveying pipeline and a stock bin, good in sealing performance, stable in sampling amount, free of old sample and residual material pollution, rapid in sampling, free of movable parts prone to abrasion, quantitative in sampling, free of material leakage, free of pollution, capable of achieving unmanned automatic sampling and convenient to use by people.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic sampling technical field especially relates to a pneumatic sampler. BACKGROUND

[0002] In modern production, raw materials and material intermediates mostly exist in the form of powder and particles, in order to control product quality, often need to sample and detect the material in the conveying pipeline. The existing sampler forms have: manual sampling, plug-in sampling, spiral sampling. Manual sampling is easy to cause material leakage and pollution, poor working environment, and cannot be used with pressure pipeline, and sampling on large container is also not convenient; Plug-in sampling has great limitations and is mostly used on conveying pipeline; The spiral body of spiral sampling does not have sealing function and is not suitable for pressure pipeline.

[0003] In the prior art, the requirements of no old sample residue pollution and no manual sampling cannot be met at the same time. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a pneumatic sampler which can meet the requirements of no old sample residue pollution and no manual sampling at the same time.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A pneumatic sampler, comprising:

[0007] A material pipeline;

[0008] A pressure equalization port is arranged on the upper part of the outer wall of the material pipeline, a venturi tube is communicated with the pressure equalization port on the material pipeline, the venturi tube can realize negative pressure sampling, and a return air valve is arranged on the venturi tube;

[0009] A gas supply valve is arranged at one end away from the material pipeline, a gas source is communicated in the gas supply valve, and the gas supply valve is used to control the gas source.

[0010] Further, the lower part of the outer wall of the material pipeline is provided with a sampling port, and the sampling port is used to sample the material in the material pipeline.

[0011] Further, the sampling port on the outer wall of the material pipeline is communicated with a connecting pipeline.

[0012] Further, one end of the connecting pipeline away from the material pipeline is communicated with the bottom of the venturi tube.

[0013] Further, a sampling valve is arranged on the connecting pipeline, and the sampling valve is used to control the sampling amount when sampling.

[0014] Further, the sampling valve is provided with a filter, which is used for filtering the material when sampling, so that the gas can pass through smoothly.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] 1. The sampling is realized by using the pneumatic conveying principle, and there is no easy-to-wear movable part, maintenance is not needed, and the service life is long.

[0017] 2. The sampling port, pipeline and filter are cleaned by using the clean airflow, so that new samples are ensured each time.

[0018] 3. The volume of each sampling is the volume of the sampling cavity, so that quantitative sampling is realized.

[0019] 4. There is no protrusion in the conveying pipeline, and the material conveying is not disturbed and no residue is left.

[0020] 5. When the Venturi tube is not ventilated, the pressure balancing port and the sampling port are balanced; when the Venturi tube is ventilated, negative pressure is generated, and the sampling is suitable for the sampling of pressure-free, pressure-bearing or vacuum pipelines and silos.

[0021] 6. The pipeline direction has no any limitation when the pipeline sampling is realized, and the sampling is suitable for the sampling of powder and granular materials.

[0022] The utility model discloses simple structure, can be quantitative in gravity conveying pipeline, pressure conveying pipeline, silo Sampling automatically, its leakproofness is good, sampling volume is stable, no old sample residue pollution, sampling is rapid, no easy-to-wear movable part, quantitative sampling, material has no leakage, no pollution, can realize unmanned automatic sampling, convenient for people to use. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is a structure schematic view of a pneumatic sampler proposed in the utility model;

[0024] Fig. 2 It is a structure schematic view of sample transfer of a pneumatic sampler proposed in the utility model;

[0025] Fig. 3 It is a structure schematic view of pre-sampling purging of a pneumatic sampler proposed in the utility model.

[0026] In the drawing: 1, pressure balancing port; 2, return air valve; 3, Venturi tube; 4, air supply valve; 5, air source; 6, connecting pipeline; 7, sampling valve; 8, sampling port; 9, material pipeline; 10, filter. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0028] Embodiment

[0029] Reference Figs. 1-3 A pneumatic sampler comprises:

[0030] A material pipeline 9;

[0031] A pressure equalization port 1 is arranged on the upper part of the outer wall of the material pipeline 9, and the material pipeline 9 is free of protrusions, does not interfere with the material conveying, and does not have residues. A Venturi tube 3 is connected to the pressure equalization port 1 on the material pipeline 9. The Venturi tube 3 can realize negative pressure sampling. A return air valve 2 is arranged on the Venturi tube 3. When the Venturi tube 3 is not ventilated, the pressure equalization port 1 is pressure balanced with a sampling port 8. When the Venturi tube 3 is ventilated, negative pressure is generated. The sampler is suitable for sampling of pressure-free, pressure-bearing or vacuum pipelines and silos.

[0032] A gas supply valve 4 is arranged at one end away from the material pipeline 9. A gas source 5 flows through the gas supply valve 4. The gas supply valve 4 is used to control the gas source 5.

[0033] In the embodiment, a sampling port 8 is arranged on the lower part of the outer wall of the material pipeline 9. The sampling port 8 is used to sample the material in the material pipeline 9.

[0034] In the embodiment, the sampling port 8 on the outer wall of the material pipeline 9 is connected to a connecting pipeline 6.

[0035] In the embodiment, one end of the connecting pipeline 6 away from the material pipeline 9 is connected to the bottom of the Venturi tube 3.

[0036] In the embodiment, a sampling valve 7 is arranged on the connecting pipeline 6. The sampling valve 7 is used to control the sampling amount when sampling.

[0037] In the embodiment, a filter 10 is arranged on the sampling valve 7. The filter 10 is used to filter the material down when sampling, so that the gas can pass through smoothly. Since the filter screen is easy to be dirty and blocked, the filter screen is cleaned by blowing each time. The sampling valve 7 is preferably a ball valve. The filter 10 can be directly installed in the ball. The filter 10 rotates with the ball. The material of the filter 10 is selected according to the particle size of the sample. The filter 10 can be a sintered filter plate, filter cloth, filter screen, screen mesh, hole mesh, etc. The filter 10 is cleaned to remove the old sample. The cleaning is realized by blocking the gas outlet of the Venturi tube 3. Alternatively, the valve is arranged at the negative pressure port of the Venturi tube 3. The valve and the sampling valve 7 are directly connected to another vent port. The single valve is used for air supply to clean.

[0038] The implementation principle of the pneumatic sampler according to the embodiment of the application is as follows: firstly, before sampling, the return air valve 2 and the sampling valve 7 are closed and turned to a horizontal state, and the air supply valve 4 is opened; at this time, the air outlet of the Venturi tube 3 cannot pass through the airflow, the airflow flows out through the negative pressure end of the Venturi tube 3, flows to the sampling valve 7 through the connecting pipeline 6, the filter 10 on the sampling valve 7 removes the surface residual material through the airflow, and the residual material on the pipeline of the sampling port 8 is also blown away, effectively avoiding the problem of mixing of old samples and new samples;

[0039] When sampling, the return air valve 2 and the sampling valve 7 are opened and turned to a horizontal state, and the air supply valve 4 is opened; at this time, the airflow passes through the Venturi tube 3, the Venturi tube 3 generates negative pressure, air is sucked into the pipeline, the material is sucked into the sampling valve 7 through the sampling port 8 along with the airflow, the filter 10 of the sampling valve 7 makes the sample stay in the chamber of the sampling valve 7, and the airflow flows away through the filter 10;

[0040] When the sample is transferred, the air supply valve 4 is closed and the return air valve 2 is closed, the sampling valve 7 is lowered to connect the multiple sampling containers or the single sampling container is connected by the sampling personnel, the sampling valve 7 is turned to a vertical state, the sample flows into the sampling container under the action of gravity, and after the sample flows away, the sampling valve 7 is turned to a horizontal state;

[0041] After sampling, close the return air valve 2 and the sampling valve 7 to the horizontal state, open the air supply valve 4, at this time due to the Venturi, 3 of the gas outlet can not pass through the air flow, the air flow through the Venturi tube 3 negative pressure end flows out, through the connecting pipe 6 to the sampling valve 7, the filter 10 on the sampling valve 7 is cleaned by the air flow on the surface of the residual material, the residual material on the sampling port 8 pipe is also blown back into the pipe, because the volume of the sampling cavity is fixed, each time sampling is equal to the volume of the sampling cavity Material is taken out, realizing the purpose of quantitative sampling, pneumatic sampling is different from the existing sampling method, its principle is to generate negative pressure by gas flow in the Venturi tube to suck the material, intercept the material through the filter, and flow out through the sampling valve, pneumatic sampling is suitable for gravity pipeline, pressure pipeline, powder and particle sampling of silo, which has the advantages of no old sample residue pollution, rapid sampling, no easy-to-wear moving parts, quantitative sampling and other multiple advantages, the negative pressure valve is preferably a ball valve, butterfly valve and plug valve, other forms of valves can also be used under the condition of meeting the flow, the air supply valve 4 is preferably an electromagnetic valve, other forms of valves can also be used under the condition of meeting the flow, an auxiliary air blowing can be added above the sampling valve 7 to cope with the difficulty of moving out of the sample during transfer of the material with viscosity, only the air source is needed to work, no additional power components are needed, the air source can be compressed air, compressed nitrogen and the like, the entire device is connected with a power supply and a total control button, which is controlled by the total control button, since the control button matches the commonly used equipment, which belongs to the existing mature technology, the electrical connection relationship and the specific circuit structure are not described here, all the structures in the application can be selected according to the actual use condition The material and length, the drawings are schematic structure diagrams, the specific actual size can be adjusted appropriately.

[0042] The above is only a preferred specific embodiment of the present embodiment, but the protection scope of the present embodiment is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the present embodiment within the technical range disclosed by the present embodiment, which should be covered within the protection scope of the present embodiment.

Claims

1. A pneumatic sampler characterized in that, Include: Material pipeline (9); Pressure balance port (1), provided in the upper part of the outer wall of the material pipeline (9), the pressure balance port (1) on the material pipeline (9) is communicated with a venturi tube (3), the venturi tube (3) is provided with a return air valve (2); Gas valve (4) is provided at one end away from the material pipeline (9), the gas valve (4) is communicated with the gas source (5), the gas valve (4) is used for controlling the gas source (5).

2. A pneumatic sampler according to claim 1, wherein, The lower part of the outer wall of the material pipeline (9) is provided with a sampling port (8), and the sampling port (8) is used for sampling the material in the material pipeline (9).

3. A pneumatic sampler according to claim 2, wherein, The sampling port (8) on the outer wall of the material pipeline (9) is communicated with the connecting pipeline (6).

4. A pneumatic sampler according to claim 3, wherein, The end of the connecting pipeline (6) away from the material pipeline (9) is communicated with the bottom of the venturi tube (3).

5. A pneumatic sampler according to claim 3, wherein, The connecting pipeline (6) is provided with a sampling valve (7), and the sampling valve (7) is used to control the amount of sampling when sampling.

6. A pneumatic sampler according to claim 5, wherein, The sampling valve (7) is provided with a filter (10), and the filter (10) is used to filter the material down when sampling, so that the gas can pass through smoothly.

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