Pagoda pole sealing device for liquid sampling

Abstract

The utility model provides a pagoda pole sealing device for liquid sampling, which comprises a joint fixing piece, a collecting needle, a pagoda joint connecting piece and a pagoda head, the upper part of the joint fixing piece is used for being connected with a mechanical arm, so that the upper end of a through hole in the joint fixing piece is communicated with a sample channel in the mechanical arm; the lower end of the through hole of the joint fixing piece is communicated with the inner hole of the collecting needle; the pagoda connector connecting piece is of a hollow structure, the upper end of the pagoda connector connecting piece is fixedly connected with the lower end of the connector fixing piece, and the lower end is used for fixing the pagoda head; the collecting needle can penetrate into the pagoda head from top to bottom, the upper end of the pagoda head is in sealed connection with the collecting needle, a liquid outlet hole communicated with the collecting needle is formed in the lower end of the pagoda head, outer groove structures with different diameters are arranged on the outer side of the pagoda head, and outer sealing rings with different specifications are mounted on the outer groove structures to adapt to extraction columns with different specifications. When the specification of the extraction column is replaced, the pagoda head does not need to be replaced, and the experiment efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to a fully automatic solid phase extraction instrument in pretreatment instrument equipment, and particularly relates to an extraction column solvent sampling and collection device in the fully automatic solid phase extraction instrument. Background Technique

[0002] Fully automatic solid phase extraction (Solid-Phase Extraction, abbreviated as SPE) is a sample pretreatment technology developed since the mid-1980s. It can be regarded as developed by combining a liquid-solid extraction column and liquid chromatography technology. It is mainly used for sample separation, purification and concentration (enrichment). The main purpose is to reduce sample matrix interference and improve detection sensitivity. Compared with the traditional liquid-liquid extraction method, it can improve the recovery rate of analytes, more effectively separate analytes from interfering components, reduce the sample pretreatment process, and is simple, time-saving and labor-saving. It is widely used in the fields of medicine, food, environment, commodity inspection, chemical industry, etc.

[0003] At present, in the market, solid phase extraction generally uses a column insertion rod or a collection needle for extraction and collection in two ways. Among them, the column insertion rod can only be used on a single specification of extraction column, and has poor compatibility. It is generally used in perfluorinated compound experimental projects; while the collection needle is widely used in the market because of its simple structure and low processing cost. However, when in use, to ensure the sealing performance with the extraction column, generally a sealing plug needs to be pre-pressed on the extraction column in advance, and different specifications of extraction columns need to make a variety of sealing plugs, which need to be manually loaded. It is more cumbersome to use. In addition, when drying the extraction column with a collection needle, there are problems of poor drying effect and slow drying efficiency, and there is also a problem of liquid hanging on the extraction column. Content of the Utility Model

[0004] The purpose of the utility model is to provide a conical rod sealing device for liquid sampling. By directly installing the sealing ring on the conical head, there is no need to replace the conical head when changing the specification of the extraction column, which effectively improves the experimental efficiency and optimizes the experience of using the instrument.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A conical rod sealing device for liquid sampling, characterized in that it includes a joint fixing part, a collection needle, a conical joint connecting part and a conical head, wherein:

[0007] The upper part of the joint fixing part is used to connect with the robotic arm, so that the upper end of the through hole inside the joint fixing part is communicated with the sample channel in the robotic arm; the lower end of the through hole of the joint fixing part is communicated with the inner hole of the collection needle;

[0008] The pagoda joint connector is a hollow structure and allows the collecting needle to pass through, and its upper end is fixedly connected to the lower end of the joint fixing member, and the lower end is used to fix the pagoda head;

[0009] The pagoda head allows the collecting needle to penetrate from top to bottom, the upper end of the pagoda head forms a sealed connection with the collecting needle, the lower end of the pagoda head is provided with a liquid outlet connected to the collecting needle, the outer side of the pagoda head is provided with an external groove structure of different diameters, and external sealing rings of different specifications are installed to adapt to extraction columns of different specifications.

[0010] The pagoda rod sealing device for liquid sampling is described, wherein a first thread is provided on the upper part of the joint fixing piece, and the first thread is used to connect with the robotic arm; a second thread is provided on the outer side of the lower part of the joint fixing piece, and the second thread is used to install the pagoda joint connector; a third thread is provided on the inner side of the lower part of the joint fixing piece, and the third thread is used to install the collecting needle.

[0011] The pagoda rod sealing device for liquid sampling is described, wherein a groove is provided on the upper end surface of the joint fixing and a sealing gasket is placed thereon to ensure the sealing of the connection between the joint fixing and the robotic arm; or, the joint fixing is sealed and connected to the robotic arm by means of a rubber sealing ring or a blade ring.

[0012] The pagoda rod sealing device for liquid sampling is characterized in that a boss is provided at the lower end of the first thread to control the verticality and positioning accuracy of the joint fixing and the mechanical arm when they are installed.

[0013] The pagoda rod sealing device for liquid sampling, wherein the bottom surface of the third thread is provided with a conical surface, and the collecting needle is fixed to the third thread of the joint fixing member through a joint and a blade ring seal;

[0014] Alternatively, the collecting needle is fixed to the joint fixing piece by laser welding.

[0015] The pagoda rod sealing device for liquid sampling is described, wherein a small groove structure is provided inside the upper end of the pagoda head for placing an inner sealing ring, and a large groove structure is provided at the upper end of the small groove structure for installing a sealing pressure ring, and the top of the sealing pressure ring abuts against the shoulder inside the pagoda joint connector, so that the sealing pressure ring presses the inner sealing ring in the small groove structure, forming a sealed connection between the pagoda head and the collecting needle.

[0016] The pagoda rod sealing device for liquid sampling, wherein the inner sealing ring and the outer sealing ring adopt an O-type sealing ring structure, a star-shaped sealing ring or a Y-shaped sealing ring structure.

[0017] The described pagoda rod sealing device for liquid sampling, wherein a chamfer structure is provided at the lower end of the pagoda head, and a plurality of small holes are uniformly arranged on the arc surface of the chamfer structure, and the plurality of small holes form the liquid outlet holes of the pagoda head.

[0018] The described pagoda rod sealing device for liquid sampling, wherein the lower end of the collection needle has a single inclined surface structure or a double inclined surface structure.

[0019] The described pagoda rod sealing device for liquid sampling, wherein the collection needle is made of 316L stainless steel material or has a structure of stainless steel with sprayed Teflon.

[0020] Compared with the existing extraction and collection structure, the utility model has high experimental efficiency, is easy to operate, has good overall structural stability of the product, is conducive to modular design, better reduces the processing cost of the whole machine, and has good expandability and practicability. Brief Description of the Drawings

[0021] Figure 1 is a perspective view of a pagoda rod sealing device for liquid sampling

[0022] Figure 2 is a cross-sectional view of a pagoda rod sealing device for liquid sampling

[0023] Figure 3A 、 Figure 3B 、 Figure 3C is a schematic diagram of a pagoda rod sealing device for liquid sampling adapted to different extraction columns.

[0024] Description of the reference numerals: joint fixing member 1; first thread 101; second thread 102; third thread 103; groove 104; boss 105; conical concave surface 106; flat surface structure 107; through hole 108; collection needle 2; inner hole 201; inclined surface structure 202; cutting ring 3; joint 4; pagoda joint connecting member 5; upper thread 501; lower thread 502; hollow structure 503; cutting plane structure 504; pagoda head 6; inner groove structure 601; inner thread structure 602; outer groove structure 603; chamfer structure 604; small hole 605; cutting plane structure 606; sealing pressure ring 7; inner sealing ring 8; outer sealing ring 9; sealing gasket 10; extraction column 11. Detailed Description of the Embodiment

[0025] As Figure 1 、 Figure 2 shown, the utility model provides a pagoda rod sealing device for liquid sampling, including a joint fixing member 1, a collection needle 2, a pagoda joint connecting member 5 and a pagoda head 6, wherein:

[0026] The upper part of the joint fixing member 1 is provided with a first thread 101 for connecting with the robotic arm, so that the through hole 108 inside the joint fixing member 1 is communicated with the sample channel in the robotic arm; the outer side of the lower part of the joint fixing member 1 is provided with a second thread 102 for installing the taper joint connecting member 5; the inner side of the lower part of the joint fixing member 1 is provided with a third thread 103 for installing the collection needle 2, so that the inner hole 201 of the collection needle 2 is communicated with the through hole 108 inside the joint fixing member 1;

[0027] In addition, a groove 104 is provided on the upper end surface of the joint fixing member 1 and a sealing gasket 10 is placed to ensure the sealing performance of the connection between the joint fixing member 1 and the robotic arm and prevent the sample from leaking out;

[0028] A boss 105 is provided at the lower end of the first thread 101 to control the perpendicularity and positioning accuracy when the joint fixing member 1 is installed on the robotic arm;

[0029] Flat structures 107 are machined on both sides of the cylindrical surface of the joint fixing member 1 to ensure that tools such as wrenches can be used for locking and fixing when the joint fixing member 1 is installed;

[0030] A conical surface is provided at the bottom surface of the third thread 103. When installing the collection needle 2, the collection needle 2 is sealed and fixed to the third thread 103 of the joint fixing member 1 through the joint 4 and the cutting ring 3. Locking the joint 4 can squeeze the cutting ring 3, causing the cutting ring 3 to close at the conical surface position to form a seal;

[0031] The upper end of the taper joint connecting member 5 is provided with an upper thread 501 for connecting with the second thread 102 of the joint fixing member 1. The middle is a hollow structure 503 for avoiding the locking joint 4 and the collection needle 2. The lower end is internally provided with a lower thread 502 for fixing the taper head 6. Two cutting plane structures 504 are provided on the outer wall of the taper joint connecting member 5, and an open-end wrench can be used for locking and reinforcement;

[0032] The upper end of the taper head 6 is connected to the lower end of the taper joint connecting member 5, and the collection needle 2 can penetrate through the taper head 6 from top to bottom. A small groove structure 601 is provided inside the upper end of the taper head 6 for placing the inner sealing ring 8, and a large groove structure 602 is provided above the small groove structure 601 for installing the sealing pressure ring 7. When the taper head 6 is locked to the taper joint connecting member 5, the top of the sealing pressure ring 7 abuts against the shoulder inside the taper joint connecting member 5 to ensure that the sealing pressure ring 7 presses the inner sealing ring 8 in the small groove structure 601 to form a sealed connection between the taper head 6 and the collection needle 2;

[0033] The lower end of the collection needle 2 is provided with an inclined surface structure 202 to ensure the guiding property when installing the inner sealing ring 8 and prevent damage to the inner sealing ring 8. At the same time, the inclined surface structure 202 of the collection needle 2 can effectively prevent the solvent from hanging on the wall and effectively reduce the residue of the solvent on the collection needle 2;

[0034] On the outer side of the conical head 6, there are external groove structures 603 with various diameters, which can install external sealing rings 9 of different specifications to adapt to extraction columns 11 of different specifications;

[0035] At the lower end of the conical head 6, there is a liquid outlet hole communicating with the collection needle 1. Specifically, at the lower end of the conical head 6, there is a chamfer structure 604, and a plurality of small holes 605 (i.e., liquid outlet holes) are evenly arranged on the arc surface of the chamfer structure 604. When drying the extraction column, the purging area can be increased, and the drying efficiency of the extraction column can be improved. When collecting by extraction, the solvent can contact the packing of the extraction column in a more gentle manner, avoiding directly impacting the packing and causing damage to the surface of the packing.

[0036] On both sides of the conical head, there are tangent plane structures 606, and an open-end wrench can be used for locking and fixing.

[0037] In the above-mentioned embodiment, the joint fixing member 1 is hermetically installed with the robotic arm by using a gasket 10. In fact, it can also be sealed by using a rubber sealing ring or a cutting ring.

[0038] In the above-mentioned embodiment, the joint fixing member 1 seals the collection needle 2 by using a joint 4 and a cutting ring 3. In fact, the collection needle 2 can also be fixed on the joint fixing member 1 by laser welding.

[0039] In the above-mentioned embodiment, the lower end of the collection needle 1 has a (single) inclined plane structure 202, which is convenient for installing the inner sealing ring 8 and can also avoid liquid residue. In fact, the inclined plane structure 202 at its lower end can also be extended to a conical structure (double inclined plane).

[0040] In the above-mentioned embodiment, the collection needle 1 is processed from 316L stainless steel with good corrosion resistance. In fact, it can also adopt a structure of stainless steel plus sprayed Teflon.

[0041] In the above-mentioned embodiment, the gasket 10 is made of PEEK material with strong corrosion resistance, and it can also be processed by using materials such as PP.

[0042] In the above-mentioned embodiment, the inner sealing ring 8 and the outer sealing ring 9 are processed from FFKM material, which can meet the experimental requirements of perfluorinated compounds, and it can also adopt a high-fluorine material with good corrosion resistance.

[0043] In the above-mentioned embodiment, the inner sealing ring 8 and the outer sealing ring 9 adopt an O-ring structure, and it can also be made into a star-shaped sealing ring or a Y-shaped sealing ring and other structures.

[0044] In the above-mentioned embodiment, the sealing pressure ring 7 is processed into a hollow cylindrical structure and is made of PEEK material. It can also be processed by using materials such as PPS, aluminum alloy or stainless steel.

Claims

1. A pagoda rod sealing device for liquid sampling, characterized in that: It includes a connector fixing part, a collecting needle, a pagoda connector connecting part and a pagoda head, wherein: The upper part of the joint fixing piece is used to connect with the robot arm, so that the upper end of the through hole inside the joint fixing piece is connected with the sample channel in the robot arm; the lower end of the through hole of the joint fixing piece is connected with the inner hole of the collection needle; The pagoda joint connector is a hollow structure and allows the collecting needle to pass through, and its upper end is fixedly connected to the lower end of the joint fixing member, and the lower end is used to fix the pagoda head; The pagoda head allows the collecting needle to penetrate from top to bottom, the upper end of the pagoda head forms a sealed connection with the collecting needle, the lower end of the pagoda head is provided with a liquid outlet connected to the collecting needle, the outer side of the pagoda head is provided with an external groove structure of different diameters, and external sealing rings of different specifications are installed to adapt to extraction columns of different specifications.

2. The pagoda rod sealing device for liquid sampling according to claim 1, characterized in that: A first thread is provided on the upper part of the joint fixing piece, and the first thread is used to connect with the robotic arm; a second thread is provided on the outer side of the lower part of the joint fixing piece, and the second thread is used to install the pagoda joint connector; a third thread is provided on the inner side of the lower part of the joint fixing piece, and the third thread is used to install the collecting needle.

3. The pagoda rod sealing device for liquid sampling according to claim 2, characterized in that: The upper end surface of the joint fixing piece is provided with a groove and a sealing gasket is placed thereon to ensure the sealing of the connection between the joint fixing piece and the robot arm; alternatively, the joint fixing piece is sealed and connected to the robot arm by means of a rubber sealing ring or a blade ring.

4. The pagoda rod sealing device for liquid sampling according to claim 2, characterized in that: A boss is provided at the lower end of the first thread to control the verticality and positioning accuracy of the joint fixing member when it is installed on the mechanical arm.

5. The pagoda rod sealing device for liquid sampling according to claim 2, characterized in that: The bottom surface of the third thread is provided with a conical surface, and the collecting needle is fixed to the third thread of the joint fixing member through the joint and the blade ring seal; Alternatively, the collecting needle is fixed to the joint fixing piece by laser welding.

6. The pagoda rod sealing device for liquid sampling according to claim 1, characterized in that: A small groove structure is provided inside the upper end of the pagoda head for placing the inner sealing ring, and a large groove structure is provided at the upper end of the small groove structure for installing the sealing pressure ring. The top of the sealing pressure ring abuts against the shoulder inside the pagoda joint connector, so that the sealing pressure ring presses the inner sealing ring in the small groove structure, forming a sealed connection between the pagoda head and the collecting needle.

7. The pagoda rod sealing device for liquid sampling according to claim 6, characterized in that: The inner sealing ring and the outer sealing ring adopt an O-shaped sealing ring structure, a star-shaped sealing ring or a Y-shaped sealing ring structure.

8. The pagoda rod sealing device for liquid sampling according to claim 1, characterized in that: The lower end of the pagoda head is provided with a chamfered structure, and a plurality of small holes are evenly arranged on the arc surface of the chamfered structure, and the plurality of small holes constitute the liquid outlet of the pagoda head.

9. The pagoda rod sealing device for liquid sampling according to claim 1, characterized in that: The lower end of the collecting needle has a single-bevel structure or a double-bevel structure.

10. The pagoda rod sealing device for liquid sampling according to claim 1, characterized in that: The collecting needle is made of 316L stainless steel, or a structure of stainless steel and Teflon sprayed.

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