Graphite pipe fixing device beneficial to accurate clamping

Abstract

The utility model relates to the technical field of clamping and positioning, in particular to a graphite pipe fixing device beneficial to accurate clamping. According to the technical scheme, the device comprises a positioning pipe, a clamping pipe and a graphite pipe body, a containing chamber is arranged in a graphite furnace bin, one end of the graphite pipe body is arranged on the containing chamber through a positioning assembly, a sample inlet opening of the graphite pipe body is vertically upward, the positioning pipe and the clamping pipe are connected with each other, and the graphite pipe body is arranged in the containing chamber. One end of the graphite pipe body is inserted into the positioning pipe, the other end of the graphite pipe body is inserted into the positioning pipe and the clamping pipe, sliding grooves are symmetrically formed in the clamping pipe, pressing blocks are arranged on the sliding grooves in a sliding mode, the sliding grooves and the pressing blocks are elastically connected through elastic assemblies, and elastic pieces are arranged on the pressing blocks. The graphite pipe is accurately clamped and stably installed through cooperation of the structures, it is ensured that the installation position of the graphite pipe is stable and not affected by external force, the graphite pipe is not prone to loosening, the whole process is rapid and convenient, and the graphite pipe installation efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of clamping and positioning, in particular to a graphite tube fixing device which is beneficial to accurate clamping. Background Technique

[0002] Heavy metals refer to metal elements with relatively high content and high toxicity compared with the metal elements existing in large quantities in the environment. It is crucial to detect heavy metal pollution in food in a timely manner to ensure food safety. At present, graphite furnace atomic absorption spectrometry is mostly used to detect heavy metals.

[0003] In the actual detection process, the sampling needle injects the digested sample solution into the graphite tube, heats the graphite tube at a high temperature of about 1000 °C, and measures the degree of atomization of the detected metal after heating in the graphite tube. Among them, the sampling position will largely affect the reproducibility of the results, and the sampling position is determined by the installation position of the graphite tube. Since the graphite tube is a consumable and needs to be replaced frequently, in order to ensure that the sampling needle for transporting the sample to be detected accurately pierces into the sampling hole, the sampling hole of the graphite tube must be vertically upward.

[0004] At present, only manual replacement of the graphite tube by tweezers can be carried out. The operator can only visually judge whether the sampling hole is vertically upward by himself, and then close the graphite tube hatch. However, in the actual operation process, the position of the graphite tube often moves slightly due to slight vibration at the moment of closing the hatch. Therefore, it is difficult to ensure that the sampling hole is accurately set vertically upward. The deviation of the sample sampling position will largely affect the sampling volume, and further affect the reproducibility of the results. Moreover, the slight resonance during the process of closing the graphite tube hatch after adjustment will affect the adjusted sampling hole position, and the operation requirements for the experimental personnel are relatively high. Some atomic absorption spectrometers are equipped with an auxiliary visual system to observe the installation position of the graphite tube, but there is a deviation in the lens perspective, and the slight vibration cannot be guaranteed during the process of closing the graphite tube hatch.

[0005] Therefore, we propose a graphite tube fixing device which is beneficial to accurate clamping to solve the existing problems. Content of the Utility Model

[0006] The purpose of the utility model is to propose a graphite tube fixing device which is beneficial to accurate clamping for the problems existing in the background technique.

[0007] To achieve the above object, the present utility model provides the following technical solutions: A graphite tube fixing device conducive to precise clamping, comprising a positioning tube, a clamping tube, and a graphite tube body. A placement chamber is provided in the graphite furnace chamber. One end of the graphite tube body is provided on the placement chamber through a positioning component, and the sample inlet of the graphite tube body opens vertically upward. The positioning tube and the clamping tube are connected to each other. The other end of the graphite tube body is inserted into the positioning tube and the clamping tube. Symmetrical chutes are provided on the clamping tube. A pressing block is slidably provided on the chutes, and the chutes and the pressing block are elastically connected through an elastic force component. A spring piece is provided on the pressing block.

[0008] Preferably, the positioning component is composed of a claw and a positioning pin. Insertion holes adapted to the positioning pin are provided on both the placement chamber and the graphite furnace chamber. The bottom end of the positioning pin penetrates through the insertion hole and is inserted into the sample inlet. The claw is fixed at the top end of the positioning pin, and the lower surface of the claw abuts against the surface of the graphite furnace chamber.

[0009] Preferably, the inner diameter of the positioning tube is adapted to the outer diameter of the graphite tube body, and the inner diameter of the clamping tube is larger than the inner diameter of the positioning tube.

[0010] Preferably, the elastic force component is composed of a slide bar, a pin slot, and a spring. The slide bar is fixed on the inner wall of the chute. The pin slot is provided on the pressing block. The slide bar is movably inserted into the pin slot. The spring is provided inside the pin slot, and the spring is located between the pin slot and the slide bar.

[0011] Preferably, a baffle is provided inside the clamping tube, and the baffle is located at the inner end of the clamping tube away from the graphite tube body.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] During the use of the graphite tube fixing device of the present utility model conducive to precise clamping, one end of the graphite tube to be installed can be inserted into the clamping tube through the positioning tube, and then the pressing block is manually pressed. The two pressing blocks approach each other. When the pressing block touches the bottom of the chute, the pressing block cannot move. At this time, the pressing block drives the spring piece to abut against the graphite tube. The elastic gasket can deform correspondingly under the contact of the graphite tube, preventing the graphite tube from cracking or even breaking under the extrusion effect; at the same time, it can ensure that the graphite tube is positioned on the clamping tube;

[0014] Then the operator holds the device and inserts the other end of the graphite tube into the placement chamber in the graphite furnace. After the graphite tube is inserted in place, the sample inlet of the graphite tube is made to open vertically upward through the positioning component;

[0015] Then the operator releases the pressing block. Under the action of the elastic component, the two pressing blocks move away from each other, so that the elastic sheet no longer exerts positioning pressure on the graphite tube, which facilitates the operator to remove the positioning tube from the graphite tube. Then the operator closes the door of the graphite furnace chamber, and finally removes the clamping jaw, thus completing the installation operation of the graphite tube.

[0016] The utility model accurately clamps and stably installs the graphite tube, ensures that the installation position of the graphite tube is stable and not affected by external forces, is not easy to loosen, the whole process is fast and convenient, and can improve the installation efficiency of the graphite tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 is a partial cross-sectional structural schematic diagram of the utility model;

[0019] Figure 3 is a partial cross-sectional structural schematic diagram of the utility model;

[0020] Figure 4 is a cross-sectional structural schematic diagram of the clamping tube of the utility model.

[0021] Reference Numerals:

[0022] 1, placement chamber; 2, graphite furnace chamber; 3, positioning tube; 4, clamping tube; 5, pressing block; 6, clamping jaw; 7, positioning pin; 8, graphite tube body; 9, sample inlet; 10, baffle; 11, elastic sheet; 12, sliding groove; 13, sliding rod; 14, pin slot; 15, spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment 1

[0025] As Figures 1 - 4As shown in the figure, a graphite tube fixing device proposed by the present utility model that is conducive to precise clamping includes a positioning tube 3, a clamping tube 4, and a graphite tube body 8. A placement chamber 1 is provided in a graphite furnace chamber 2. One end of the graphite tube body 8 is provided on the placement chamber 1 through a positioning assembly, and the sample inlet 9 of the graphite tube body 8 opens vertically upward. The positioning tube 3 and the clamping tube 4 are connected to each other. The other end of the graphite tube body 8 is inserted into the positioning tube 3 and the clamping tube 4. Symmetrical sliding grooves 12 are provided on the clamping tube 4. Pressing blocks 5 are slidably provided on the sliding grooves 12, and the sliding grooves 12 and the pressing blocks 5 are elastically connected through an elastic force assembly. Elastic pieces 11 are provided on the pressing blocks 5.

[0026] Based on Embodiment 1:

[0027] During the use of the graphite tube fixing device of the present utility model that is conducive to precise clamping, one end of the graphite tube to be installed can be inserted into the clamping tube 4 through the positioning tube 3, and then the pressing blocks 5 are manually pressed. The two pressing blocks 5 approach each other. When the pressing blocks 5 touch the bottom of the sliding grooves 12, the pressing blocks 5 cannot move. At this time, the pressing blocks 5 drive the elastic pieces 11 to abut against the graphite tube. The elastic pieces 11 can produce corresponding deformations in contact with the graphite tube, preventing the graphite tube from cracking or even breaking under the extrusion effect, and at the same time ensuring that the graphite tube is positioned on the clamping tube 4;

[0028] Then the operator holds the device and inserts the other end of the graphite tube into the placement chamber 1 in the graphite furnace. After the graphite tube is inserted in place, the sample inlet 9 of the graphite tube is made to open vertically upward through the positioning assembly;

[0029] Then the operator releases the pressing blocks 5. Under the action of the elastic force assembly, the two pressing blocks 5 move away from each other, so that the elastic pieces 11 no longer exert a positioning pressure on the graphite tube, facilitating the operator to remove the positioning tube 3 from the graphite tube. Then the operator closes the door of the graphite furnace chamber 2, and finally removes the clamping claws 6, thus completing the installation operation of the graphite tube.

[0030] Embodiment Two

[0031] As Figures 1 - 4 shown, a graphite tube fixing device proposed by the present utility model that is conducive to precise clamping. Compared with Embodiment 1, this embodiment further includes:

[0032] The inner diameter of the positioning tube 3 is adapted to the outer diameter of the graphite tube body 8, and the inner diameter of the clamping tube 4 is greater than the inner diameter of the positioning tube 3. A baffle 10 is provided inside the clamping tube 4. The baffle 10 is located at the end of the clamping tube 4 far from the graphite tube body 8. The graphite tube body 8 is preliminarily limited by the positioning tube 3, and the inner diameter of the clamping tube 4 is greater than the diameter of the graphite tube, ensuring that the elastic pieces 11 have sufficient moving stroke and preventing the elastic pieces 11 from exerting too much pressure on the graphite tube.

[0033] The elastic component is composed of a slide bar 13, a pin slot 14 and a spring 15. The slide bar 13 is fixed on the inner wall of the chute 12. The pin slot 14 is formed on the pressing block 5. The slide bar 13 is movably inserted into the pin slot 14. The spring 15 is arranged inside the pin slot 14 and is located between the pin slot 14 and the slide bar 13. Through the cooperation of the above structures, when a person applies a gripping force to the two pressing blocks 5, the two pressing blocks 5 approach each other, thereby driving the elastic sheet 11 to abut against the graphite tube body 8. At this time, the slide bar 13 slides in the pin slot 14, thereby compressing the spring 15 to deform. When the gripping force on the pressing block 5 is lost, the pressing block 5 automatically resets under the elastic force of the spring 15.

[0034] The positioning component is composed of a claw 6 and a positioning pin 7. Insertion holes adapted to the positioning pin 7 are formed on both the placement chamber 1 and the graphite furnace chamber 2. The bottom end of the positioning pin 7 penetrates through the insertion hole and is inserted into the sample injection port 9. The claw 6 is fixed at the top end of the positioning pin 7, and the bottom surface of the claw 6 abuts against the surface of the graphite furnace chamber 2. After a person holds the device and drives the graphite tube into the placement chamber 1, the person makes the positioning pin 7 penetrate through the placement chamber 1, the graphite furnace chamber 2 and be inserted into the sample injection port 9 of the graphite tube through the cross claw 6. The positioning pin 7 ensures that the sample injection port 9 of the graphite tube is vertically upward.

[0035] The above specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0036] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A graphite tube fixing device that facilitates precise clamping, comprising a positioning tube (3), a clamping tube (4) and a graphite tube body (8), characterized in that: The graphite furnace chamber (2) is provided with a placement chamber (1), one end of the graphite tube body (8) is arranged on the placement chamber (1) through a positioning component, and the sample inlet (9) of the graphite tube body (8) opens vertically upward, the positioning tube (3) and the clamping tube (4) are connected to each other, the other end of the graphite tube body (8) is inserted into the positioning tube (3) and the clamping tube (4), and the clamping tube (4) is symmetrically provided with a slide groove (12), a pressure block (5) is slidably provided on the slide groove (12), and the slide groove (12) and the pressure block (5) are elastically connected through an elastic component, and a spring sheet (11) is provided on the pressure block (5).

2. A graphite tube fixing device that facilitates precise clamping according to claim 1, characterized in that: The positioning assembly is composed of a clamping claw (6) and a positioning pin (7). The placement chamber (1) and the graphite furnace chamber (2) are both provided with a socket adapted to the positioning pin (7). The bottom end of the positioning pin (7) passes through the socket and is inserted into the injection port (9). The clamping claw (6) is fixed to the top end of the positioning pin (7), and the bottom of the clamping claw (6) is against the surface of the graphite furnace chamber (2).

3. The graphite tube fixing device that facilitates precise clamping according to claim 1 is characterized in that: The inner diameter of the positioning tube (3) is matched to the outer diameter of the graphite tube body (8), and the inner diameter of the clamping tube (4) is larger than the inner diameter of the positioning tube (3).

4. The graphite tube fixing device for accurate clamping according to claim 1 is characterized in that: The elastic component is composed of a slide bar (13), a pin groove (14) and a spring (15); the slide bar (13) is fixed to the inner wall of the slide groove (12); the pin groove (14) is provided on the pressure block (5); the slide bar (13) is movably plugged into the pin groove (14); the spring (15) is arranged inside the pin groove (14); and the spring (15) is located between the pin groove (14) and the slide bar (13).

5. The graphite tube fixing device that facilitates precise clamping according to claim 1 is characterized in that: A baffle (10) is provided inside the clamping tube (4), and the baffle (10) is located inside an end of the clamping tube (4) away from the graphite tube body (8).

Images