Concentric positioning device and positioning method for hydrofluoric acid-resistant torch tube for ICP spectrograph

Abstract

The invention discloses a hydrofluoric acid-resistant torch tube concentric positioning device for an ICP spectrometer, the positioning device is of a three-layer structure and sequentially comprises an upper movable layer, a middle layer and a bottom layer from top to bottom, and the upper movable layer, the middle layer and the bottom layer are connected through guide columns; the upper movable layer is provided with an upper fixed inclined plane positioning structure, the bottom layer is provided with a lower fixed positioning structure, the middle layer is provided with a rubber ring positioning hole matched with a glass tube for use, and the upper fixed inclined plane positioning structure, the rubber ring positioning hole and the lower fixed positioning structure are coaxially arranged; the hydrofluoric acid rectangular tube penetrates through the rubber ring positioning hole of the middle layer to be inserted into the lower fixed positioning structure, the hydrofluoric acid rectangular tube is pressed downwards through the upper movable layer, the hydrofluoric acid rectangular tube is concentrically positioned through the upper fixed inclined plane positioning structure, the rubber ring positioning hole and the lower fixed positioning structure, and coaxial arrangement of the positioning structure of each layer is guaranteed through the arrangement of the three-layer structure. When the hydrofluoric acid rectangular tube is placed on the device, the hydrofluoric acid rectangular tube is automatically aligned so as to achieve the purpose of concentricity.

Description

Technical Field

[0001] The invention relates to the technical application field of ICP spectrometers, and in particular to a hydrofluoric acid-resistant torch concentric positioning device and a positioning method for an ICP spectrometer. Background Art

[0002] An ICP spectrometer is a commonly used elemental analysis instrument. The hydrofluoric acid-resistant torch in its sample inlet system consists of a central tube and a glass tube. These two components are connected by a PEEK joint and a rubber ring. Because the dimensional accuracy of the central tube and glass tube is difficult to guarantee through machining, precise concentric positioning of the two using only the rubber ring is difficult.

[0003] ICP spectrometers require high measurement accuracy. The central tube and glass tube must be highly concentric, otherwise the accuracy of the measurement results will be affected. However, the existing rubber ring connection method cannot meet the requirements of high-precision concentric positioning.

[0004] In summary, in order to solve the above technical problems, it is urgent to provide a hydrofluoric acid resistant torch concentric positioning device for an ICP spectrometer. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a concentric positioning device and positioning method for a hydrofluoric acid-resistant torch tube for an ICP spectrometer. Through the arrangement of a three-layer structure and the positioning structure of each layer structure, the coaxial setting is ensured. When the hydrofluoric acid torch tube is placed on the device, it is automatically aligned to achieve the purpose of concentricity.

[0006] The technical solution of the present invention is: a hydrofluoric acid-resistant torch concentric positioning device for an ICP spectrometer, the hydrofluoric acid torch comprising a glass tube and a central tube inserted into the glass tube and connected via a PEEK joint, the positioning device having a three-layer structure and comprising, from top to bottom, an upper active layer, an intermediate layer, and a bottom layer, the upper active layer, the intermediate layer, and the bottom layer being connected via guide pillars; The upper movable layer is provided with an upper fixed inclined surface positioning structure, the bottom layer is provided with a lower fixed surface positioning structure and a movable surface positioning structure, the middle layer is provided with a rubber ring positioning hole for use with the glass tube, and the upper fixed inclined surface positioning structure, the rubber ring positioning hole, the lower fixed surface positioning structure and the movable surface positioning structure are coaxially arranged; The hydrofluoric acid moment tube is inserted into the lower fixed positioning structure and the movable positioning structure through the rubber ring positioning hole of the middle layer, and is pressed down by the upper movable layer to concentrically position the hydrofluoric acid moment tube through the upper fixed inclined positioning structure, the rubber ring positioning hole, the lower fixed positioning structure and the movable positioning structure.

[0007] Furthermore, the lower fixing and positioning structure includes a through hole opened in the bottom layer, wherein the upper half of the through hole located at the bottom layer is an inverted tapered hole, and the lower half located at the bottom layer is a cylindrical hole; A cylindrical step column is provided in the through hole, one end of the cylindrical step column is located in the cylindrical hole and cooperates with the inverted tapered hole to support and position the glass tube; the other end of the cylindrical step column extends out of the upper surface of the bottom layer.

[0008] Furthermore, a cylindrical hole is provided at the other end of the cylindrical step column, and the movable positioning structure is movably arranged in the cylindrical hole and can move up and down in the cylindrical hole.

[0009] Furthermore, the movable positioning structure includes a bowl-shaped positioning seat and a spring used in conjunction with the central tube, one end of the spring is located in the cylindrical hole, and the other end of the spring is connected to the bowl-shaped positioning seat.

[0010] Furthermore, the bowl-shaped positioning seat, cylindrical hole and through hole are all coaxially arranged.

[0011] Furthermore, the upper fixed inclined surface positioning structure is a positioning hole provided on the upper movable layer, and the upper portion of the positioning hole located on the upper movable layer is a cylindrical hole, and the lower portion located on the upper movable layer is a conical hole used in conjunction with the central tube.

[0012] Furthermore, the rubber ring positioning hole, the cylindrical hole and the tapered hole are coaxially arranged.

[0013] A method for concentric positioning of a hydrofluoric acid-resistant torch for an ICP spectrometer, characterized in that: Step 1: Assemble the intermediate tube and the glass tube; Step 2: Use high-temperature resistant glue to bond the middle tube, PEEK connector, and glass tube.

[0014] Step 3: Remove the upper active layer and insert the glued hydrofluoric acid matrix tube from the middle layer to the bottom layer; Step 4: Press the upper active layer against the hydrofluoric acid matrix tube and wait for the glue to cure.

[0015] Furthermore, in step 4, during the downward pressing process, the intermediate tube and the glass tube are positioned and adjusted respectively through the upper fixed inclined positioning structure of the upper movable layer, the rubber ring positioning hole of the middle layer, the lower fixed positioning structure and the movable positioning structure of the bottom layer, so as to position the intermediate tube and the glass tube concentrically.

[0016] The beneficial technical effects of the present invention are: 1. By positioning both ends of the glass tube and the center tube separately, highly concentric positioning of the center tube and the glass tube is achieved, thereby ensuring high precision of the ICP spectrometer measurement results and overcoming the defect in the existing technology that high-precision concentric positioning cannot be achieved by relying solely on rubber ring connection.

[0017] 2. It adopts a three-layer structure design, with the upper layer being movable, which is convenient for installing and removing the central tube and glass tube and is easy to operate.

[0018] 3. By using high-temperature resistant glue for bonding, the problem that the rubber ring soft connection in the existing technology cannot achieve high-precision concentric positioning is solved.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the hydrofluoric acid torque tube of the present invention; Figure 3 is a cross-sectional view of the overall structure of the present invention; Figure 4 For the present invention Figure 3 A magnified view in ; Figure 5 For the present invention Figure 3 B enlarged view in the figure; Figure 6 It is a cross-sectional view of the hydrofluoric acid matrix tube of the present invention.

[0021] The accompanying drawings are: 100. Bottom layer; 110. Lower fixed positioning structure; 111. Cylindrical step column; 112. Bowl-shaped positioning seat; 113. Spring; 114. Inverted tapered hole; 200. Middle layer; 210. Rubber ring positioning hole; 300. Upper movable layer; 310. Upper fixed inclined positioning structure; 400. Guide column; 500. Hydrofluoric acid moment tube; 510. Glass tube; 520. Middle tube. DETAILED DESCRIPTION

[0022] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0023] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of the present application herein.

[0024] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship described in the embodiments and shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figures 1-6 As shown, the present invention specifically relates to a hydrofluoric acid-resistant torch concentric positioning device for an ICP spectrometer, wherein the hydrofluoric acid torch 500 includes a glass tube 510 and a center tube inserted into the glass tube 510 and connected via a PEEK joint, the positioning device has a three-layer structure and comprises, from top to bottom, an upper active layer 300, an intermediate layer 200, and a bottom layer 100, wherein the upper active layer 300, the intermediate layer 200, and the bottom layer 100 are connected via a guide column 400; The upper movable layer 300 is provided with an upper fixed inclined surface positioning structure 310, the bottom layer 100 is provided with a lower fixed surface positioning structure 110 and a movable surface positioning structure, and the middle layer 200 is provided with a rubber ring positioning hole 210 for use with the glass tube 510. The upper fixed inclined surface positioning structure 310, the rubber ring positioning hole 210, the lower fixed surface positioning structure 110, and the movable surface positioning structure are coaxially arranged. The hydrofluoric acid moment tube 500 is inserted into the lower fixed positioning structure 110 and the movable positioning structure through the rubber ring positioning hole 210 of the middle layer 200, and is pressed down by the upper movable layer 300, so as to concentrically position the hydrofluoric acid moment tube 500 through the upper fixed inclined positioning structure 310, the rubber ring positioning hole 210, the lower fixed positioning structure 110 and the movable positioning structure.

[0026] It should be noted that the hydrofluoric acid matrix tube 500 is mainly composed of an intermediate tube 520 and a glass tube 510, and the connection between the two is connected by a PEEK joint. The specific shape and structure is a conventional square tube in the prior art, so it is not described in detail.

[0027] The positioning device includes an upper movable layer 300, an intermediate layer 200 and a bottom layer 100, wherein the positions of the intermediate layer 200 and the bottom layer 100 are fixed and will not change. The upper movable layer 300 can move up and down relative to the guide column 400 to place and take out the hydrofluoric acid matrix tube 500.

[0028] In addition, the upper movable layer 300 is provided with an upper fixed inclined positioning structure 310, which cooperates with the intermediate tube 520 to position the intermediate tube 520. The bottom layer 100 is provided with a lower fixed positioning structure 110 and a movable positioning structure, which cooperate with the glass tube 510 and the intermediate tube 520 to position the glass tube 510 and the intermediate tube 520.

[0029] Furthermore, the middle layer 200 can also position the glass tube 510 through the rubber ring positioning hole 210. Through the mutual cooperation of the upper movable layer 300, the middle layer 200 and the bottom layer 100, it is ensured that the middle tube 520 and the glass tube 510 are in the same axial direction, and the purpose of concentric positioning is achieved through four-point positioning.

[0030] The lower fixing and positioning structure 110 includes a through hole opened in the bottom layer 100. The upper half of the through hole located in the bottom layer 100 is an inverted tapered hole 114, and the lower half of the through hole located in the bottom layer 100 is a cylindrical hole. A cylindrical step column 111 is provided in the through hole, one end of the cylindrical step column 111 is located in the cylindrical hole and cooperates with the inverted tapered hole 114 to support and position the glass tube 510; the other end of the cylindrical step column 111 extends out of the upper surface of the bottom layer 100.

[0031] The outer diameter of one end of the cylindrical step column 111 is larger than the outer diameter of the other end of the cylindrical step column 111. The cylindrical step column 111 is inserted from the bottom of the bottom layer 100, and the other end of the cylindrical step column 111 extends out of the bottom layer 100.

[0032] One end of the cylindrical step column 111 can just fill the cylindrical hole. When the glass tube 510 is inserted into the inverted tapered hole 114 , it is not only automatically positioned by the inverted tapered hole 114 , but also supported by one end of the cylindrical step column 111 .

[0033] In addition, the rubber ring positioning hole 210 and the through hole of the middle layer 200 are in the same axial direction. Therefore, the glass tube 510 is positioned by the cooperation between the middle layer 200 and the bottom layer 100, thereby ensuring the accuracy of the position of the glass tube 510.

[0034] A cylindrical hole is provided at the other end of the cylindrical step column 111 , and the movable positioning structure is movably disposed in the cylindrical hole and can move up and down in the cylindrical hole.

[0035] It has been mentioned above that the intermediate tube 520 is inserted into the glass tube 510 . Therefore, after the position of the glass tube 510 is determined, both ends of the intermediate tube 520 also need to be accurately positioned.

[0036] The other end of the cylindrical step column 111 is a hollow structure with a cylindrical hole inside. A movable positioning structure used in conjunction with one end of the intermediate tube 520 is disposed in the cylindrical hole.

[0037] When the glass tube 510 is inserted into the inverted tapered hole 114, one end of the intermediate tube 520 also abuts against the movable positioning structure, driving the movable positioning structure to move downward in the cylindrical hole. When the movement stops, the positioning of one end of the intermediate tube 520 and the entire glass tube 510 is simultaneously completed.

[0038] The movable positioning structure includes a bowl-shaped positioning seat 112 and a spring 113 used in conjunction with the central tube. One end of the spring 113 is located in the cylindrical hole, and the other end of the spring 113 is connected to the bowl-shaped positioning seat 112.

[0039] The function of the bowl-shaped positioning seat 112 is the same as that of the tapered hole, and the tapered structure inside the bowl-shaped positioning seat 112 is used to achieve automatic positioning.

[0040] Spring 113 serves the purpose of resetting bowl-shaped locating seat 112. Besides resetting, the spring also serves to self-adjust the height of the bowl-shaped locating seat. This is because each torch has a height error; a deviation of a few tenths of a millimeter can cause the original height of the bowl-shaped locating seat to be incorrect, necessitating self-adjustment. The spring also applies upward pressure to the bowl-shaped locating seat, which in turn exerts a centripetal force on the center tube, thus achieving its desired positioning effect.

[0041] The bowl-shaped positioning seat 112 , the cylindrical hole and the through hole are all coaxially arranged.

[0042] The upper fixed inclined positioning structure 310 is a positioning hole provided on the upper movable layer 300 , and the upper portion of the positioning hole located on the upper movable layer 300 is a cylindrical hole, and the lower portion of the positioning hole located on the upper movable layer 300 is a tapered hole used in conjunction with the central tube.

[0043] The rubber ring positioning hole 210 , the cylindrical hole and the tapered hole are coaxially arranged.

[0044] The middle tube 520 can be precisely positioned through the tapered hole of the upper movable layer 300 and the bowl-shaped positioning seat 112 of the bottom layer 100 , and the glass tube 510 can be precisely positioned through the rubber ring positioning hole 210 of the middle layer 200 and the inverted tapered hole 114 of the bottom layer 100 ; In addition, since the cylindrical hole and the conical hole of the upper active layer 300, the rubber positioning hole of the middle layer 200 and the through hole of the bottom layer 100 are all coaxially arranged, when the hydrofluoric acid moment tube 500 is placed on the positioning device, the middle tube 520 and the glass tube 510 can be quickly concentrically positioned.

[0045] A method for concentric positioning of a hydrofluoric acid-resistant torch for an ICP spectrometer, characterized in that: Step 1: Assemble the intermediate tube 520 and the glass tube 510; Step 2: Use high-temperature resistant glue to bond the intermediate tube 520, the PEEK connector, and the glass tube 510.

[0046] Step 3: Remove the upper active layer 300 and insert the glued hydrofluoric acid matrix tube 500 from the middle layer 200 into the bottom layer 100; Step 4: Press the upper active layer 300 against the hydrofluoric acid torque tube 500 and wait for the glue to solidify.

[0047] Furthermore, in step 4, during the downward pressing process, the intermediate tube 520 and the glass tube 510 are positioned and adjusted respectively through the upper fixed inclined positioning structure 310 of the upper movable layer 300, the rubber ring positioning hole 210 of the middle layer 200, the lower fixed positioning structure 110 and the movable positioning structure of the bottom layer 100, so as to position the intermediate tube 520 and the glass tube 510 concentrically.

[0048] The above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention.

Claims

1. A hydrofluoric acid-resistant torch concentric positioning device for an ICP spectrometer, wherein the hydrofluoric acid torch (500) comprises a glass tube (510) and a central tube inserted into the glass tube (510) and connected via a PEEK joint, characterized in that: The positioning device has a three-layer structure and comprises, from top to bottom, an upper movable layer (300), an intermediate layer (200) and a bottom layer (100), wherein the upper movable layer (300), the intermediate layer (200) and the bottom layer (100) are connected via guide pillars (400); The upper movable layer (300) is provided with an upper fixed inclined surface positioning structure (310), the bottom layer (100) is provided with a lower fixed positioning structure (110) and a movable positioning structure, the middle layer (200) is provided with a rubber ring positioning hole (210) used in conjunction with the glass tube (510), and the upper fixed inclined surface positioning structure (310), the rubber ring positioning hole (210), the lower fixed positioning structure (110) and the movable positioning structure are coaxially arranged; The hydrofluoric acid moment tube (500) is inserted into the lower fixed positioning structure (110) and the movable positioning structure through the rubber ring positioning hole (210) of the middle layer (200), and is pressed downward by the upper movable layer (300), so that the hydrofluoric acid moment tube (500) is concentrically positioned through the upper fixed inclined surface positioning structure (310), the rubber ring positioning hole (210), the lower fixed positioning structure (110) and the movable positioning structure.

2. The hydrofluoric acid-resistant torch concentric positioning device for ICP spectrometer according to claim 1, wherein The lower fixed positioning structure (110) includes a through hole opened in the bottom layer (100), wherein the upper half of the through hole located in the bottom layer (100) is an inverted conical hole (114), and the lower half of the through hole located in the bottom layer (100) is a cylindrical hole; A cylindrical step column (111) is provided in the through hole, one end of the cylindrical step column (111) is located in the cylindrical hole and cooperates with the inverted tapered hole (114) to support and position the glass tube (510); the other end of the cylindrical step column (111) extends out of the upper surface of the bottom layer (100).

3. The hydrofluoric acid-resistant torch concentric positioning device for ICP spectrometer according to claim 2, wherein The other end of the cylindrical step column (111) is provided with a cylindrical hole, and the movable positioning structure is arranged in the cylindrical hole and can move up and down in the cylindrical hole.

4. The hydrofluoric acid-resistant torch concentric positioning device for ICP spectrometer according to claim 3, wherein The movable positioning structure includes a bowl-shaped positioning seat (112) and a spring (113) used in conjunction with the central tube, one end of the spring (113) is located in the cylindrical hole, and the other end of the spring (113) is connected to the bowl-shaped positioning seat (112).

5. The hydrofluoric acid-resistant torch concentric positioning device for ICP spectrometer according to claim 4, wherein The bowl-shaped positioning seat (112), the cylindrical hole and the through hole are all coaxially arranged.

6. The hydrofluoric acid-resistant torch concentric positioning device for ICP spectrometer according to claim 1, wherein The upper fixed inclined surface positioning structure (310) is a positioning hole provided on the upper movable layer (300), and the upper portion of the positioning hole located on the upper movable layer (300) is a cylindrical hole, and the lower portion of the positioning hole located on the upper movable layer (300) is a tapered hole used in conjunction with the central tube.

7. The hydrofluoric acid-resistant torch concentric positioning device for ICP spectrometer according to claim 6, wherein: The rubber ring positioning hole (210), the cylindrical hole and the tapered hole are coaxially arranged.

8. A positioning method using the hydrofluoric acid resistant torch concentric positioning device for an ICP spectrometer according to claim 1, characterized in that: Step 1: Assemble the intermediate tube (520) and the glass tube (510); Step 2: Use high temperature resistant glue to bond the intermediate tube (520), the PEEK connector and the glass tube (510); Step 3: Remove the upper active layer (300), and insert the glued hydrofluoric acid matrix tube (500) from the middle layer (200) into the bottom layer (100); Step 4: Press the upper active layer (300) against the hydrofluoric acid matrix tube (500) and wait for the glue to solidify.

9. The method for concentric positioning of a hydrofluoric acid-resistant torch for an ICP spectrometer according to claim 8, wherein: In step 4, during the downward pressing process, the intermediate tube (520) and the glass tube (510) are positioned and adjusted respectively by the upper fixed inclined surface positioning structure (310) of the upper movable layer (300), the rubber ring positioning hole (210) of the middle layer (200), the lower fixed positioning structure (110) and the movable positioning structure of the bottom layer (100), so as to position the intermediate tube (520) and the glass tube (510) concentrically.

Images