CN107894397B - Self-adaptive graphite furnace self-locking device - Google Patents
Self-adaptive graphite furnace self-locking device Download PDFInfo
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- CN107894397B CN107894397B CN201711359882.0A CN201711359882A CN107894397B CN 107894397 B CN107894397 B CN 107894397B CN 201711359882 A CN201711359882 A CN 201711359882A CN 107894397 B CN107894397 B CN 107894397B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 80
- 239000010439 graphite Substances 0.000 title claims abstract description 80
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229920001342 Bakelite® Polymers 0.000 claims description 10
- 239000004637 bakelite Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000005283 ground state Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000001479 atomic absorption spectroscopy Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000705 flame atomic absorption spectrometry Methods 0.000 description 1
- 238000000673 graphite furnace atomic absorption spectrometry Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Carbon And Carbon Compounds (AREA)
- Resistance Heating (AREA)
Abstract
Self-adaptation formula graphite stove self-locking device, its characterized in that: the furnace comprises a fixed furnace body part (1), a movable furnace body part (2), a connecting rod mechanism (3) and a base part (4), wherein the fixed furnace body part (1) is arranged on the base part, the movable furnace body part (2) is connected with the base part (4), and the relative position between the movable furnace body part (2) and the fixed furnace body part (1) can be adjusted by the connecting rod mechanism (3). The self-adaptive graphite tube length temperature-changing graphite furnace self-locking device can realize the locking function by completely utilizing the connecting rod mechanism with the variable crank length, has compact structure, stable and reliable function and no self-locking impact, and can adapt to the length change quantity of the graphite tube in the working process of the graphite furnace atomizer. The service life of the graphite tube can be effectively prolonged, and the use cost is reduced.
Description
Technical Field
The invention belongs to the technical field of material analysis instruments, and particularly relates to a self-locking device of a self-adaptive graphite furnace.
Background
Atomic absorption spectrometry is an extremely important analytical method in the analytical chemistry field and has been widely used in the metallurgical industry. Atomic absorption spectrometry is a method of quantitatively analyzing the degree of absorption of the ground state atomic characteristic radiation of an element to be measured. The method can be used for measuring certain constant components, ppm and ppb trace, and can be used for measuring various elements by an atomic absorption spectrometer, wherein the flame atomic absorption spectrometry can be used for measuring the order of 10 -9 g/mL, and the graphite furnace atomic absorption spectrometry can be used for measuring the order of 10 -13 g/mL.
The atomic absorption spectrometer consists of a light source, an atomizer, a light splitting system and a detection system, and the atomic absorption spectrometer works on the principle that a sample is converted into vapor in the atomizer, most of atoms are in a ground state due to low temperature, and when a single beam emitted from a hollow cathode lamp radiation source passes through the vapor of the sample, as the radiation frequency corresponds to the frequency of energy required by electrons in the atoms to transition from the ground state to a higher excitation state, a part of light is absorbed by the atoms, namely resonance absorption. The other part of light which is not absorbed is the analysis signal and is received by the photoelectric detection system. Since the sharp beam is attenuated by absorption to a degree proportional to the concentration of the analytical element in the atomic vapor, the elemental content of the sample can be obtained by comparing the measurement result with a standard.
The graphite furnace atomizer is one of the most main devices of an atomic absorption analyzer, almost covers all metal elements in the analysis range, has the highest sensitivity and is widely applied to trace detection of the elements. The graphite furnace atomizer has an important influence on the performance index of the atomic absorption spectrophotometer. The graphite furnace body needs to be supplied with large current, cooling water and protective gas, which makes the internal structure of the graphite furnace body complex. In the working process of the furnace body of the graphite furnace atomizer, on one hand, graphite pipes are clamped, and on the other hand, in the atomization process, the graphite pipes have huge temperature difference before and after heating, so that the length variation of the graphite pipes due to expansion caused by heat and contraction caused by cold reaches 1-1.2mm, and therefore, the relative displacement between the fixed furnace body and the movable furnace body is required to be automatically adapted to the length variation of the graphite pipes so as to avoid breakage of the graphite pipes in the heating process. Therefore, the reasonable or not of the graphite furnace body structure not only directly influences the service lives of the graphite pipes and the graphite furnace, but also influences the detection precision, the existing graphite furnace is fastened mainly by the action of the pneumatic valve, the impact is large when the pneumatic valve acts, and the damage to the graphite pipes is easy to cause.
Disclosure of Invention
The invention aims to provide the self-locking device of the self-adaptive graphite furnace, which can adapt to the length variation of the graphite pipe caused by the characteristic of thermal expansion and cold contraction, solve the defect of damage to the graphite pipe caused by overlarge impact force of a pneumatic valve and effectively prolong the service life of the graphite pipe aiming at the technical defect that the graphite pipe is easy to break in the heating process of the graphite pipe by the conventional atomizer of the graphite furnace.
Technical proposal
In order to achieve the technical purpose, the self-locking device of the self-adaptive graphite furnace, which is designed by the invention, is characterized in that: the furnace comprises a fixed furnace body part, a movable furnace body part, a connecting rod mechanism and a base part, wherein the fixed furnace body part is arranged on the base part, the movable furnace body part is connected with the base part, and the relative position between the movable furnace body part and the fixed furnace body part can be adjusted by the connecting rod mechanism.
The fixed furnace body part comprises a fixed furnace body, a graphite cone I, a graphite pipe, a gas circuit connector I, a lens cone I, ultraviolet-transmitting quartz glass I, a lens cone end cover I, an O-shaped sealing ring I, a water pipe connector I and a copper wire connecting terminal;
The ultraviolet-transmitting quartz glass is pressed at one end of the lens cone I through the lens cone end cover I, the other end of the lens cone I is provided with the O-shaped sealing ring I and then is arranged in the mounting groove I on one side end of the fixed furnace body, the mounting groove II on the other side end of the fixed furnace body is internally provided with the graphite cone I, the graphite pipe is inserted into the graphite cone I, the air passage connector I and the copper wire connecting terminal are arranged on the side end face of the fixed furnace body, and the water pipe connector I is arranged on the lower end face of the fixed furnace body and stretches into the base component.
The movable furnace body part comprises a movable furnace body, a second lens cone, a second ultraviolet-transmitting quartz glass, a second lens cone end cover, a second O-shaped sealing ring, a second graphite cone, a guide shaft, a second gas circuit connector, a second water pipe connector, a circuit connector, a connecting pin of a connecting rod mechanism, a first set screw and a third O-shaped sealing ring;
The ultraviolet-transmitting quartz glass II is pressed and assembled with one end of the lens barrel II through the lens barrel end cover II, the other end of the lens barrel II is provided with the O-shaped sealing ring II and then is arranged in the mounting groove III on one side end of the movable furnace body, the other side end of the movable furnace body is sleeved with the O-shaped sealing ring III, the graphite cone II is inserted and assembled in the mounting groove IV on the other side end of the movable furnace body, the guide shaft is fixedly arranged on the movable furnace body part, and the connecting pin of the connecting rod mechanism is arranged on the movable furnace body and is connected with the connecting rod mechanism.
Further, the connecting rod mechanism comprises a limiting piece, a nut, a spring, a crank, a rotating shaft, a hinge, a handle, a connecting rod and a clamping ring for the shaft;
the crank passes through holes in the rotating shaft and the hinge, a spring is sleeved on the crank, one end of the crank passing through the hinge is locked by a nut, a handle is arranged on the rotating shaft, the hinge is connected with a connecting rod, the connecting rod is connected with a connecting pin of the connecting rod mechanism, and the rotating shaft is arranged on the base component.
Further, the base part comprises a base, an electric bakelite fixing block, a linear bearing and a second set screw, wherein the linear bearing is arranged in a hole of the electric bakelite fixing block and is pressed by the second set screw, and the base is connected with the electric bakelite fixing block by the screw.
Advantageous effects
The self-adaptive graphite furnace self-locking device provided by the invention can realize the locking function by completely utilizing the connecting rod mechanism with the variable crank length, has compact structure, stable and reliable function and no self-locking impact, and can adapt to the length variation of the graphite tube in the working process of the graphite furnace atomizer. The service life of the graphite tube can be effectively prolonged, and the use cost is reduced.
Drawings
Fig. 1 is a product diagram of an embodiment of the present invention.
Fig. 2 is an exploded view of an embodiment of the present invention.
FIG. 3 is an exploded view of the stationary furnace components of an embodiment of the present invention.
FIG. 4 is a schematic view of the structure of a fixed furnace body part in an embodiment of the present invention.
FIG. 5 is an exploded view of the movable furnace components in an embodiment of the present invention.
FIG. 6 is a schematic view of the structure of the movable furnace body part in the embodiment of the present invention.
Fig. 7 is a schematic structural view of a link mechanism in an embodiment of the present invention.
Fig. 8 is an exploded view of a base member in an embodiment of the invention.
Fig. 9 is a schematic view of the structure of the base member in the embodiment of the present invention.
Fig. 10 is a schematic diagram of the operation of an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Examples
As shown in fig. 1 and 2, the self-locking device of the self-adaptive graphite furnace comprises a fixed furnace body part 1, a movable furnace body part 2, a connecting rod mechanism 3 and a base part 4, wherein the fixed furnace body part 1 is arranged on the base part, the movable furnace body part 2 is connected with the base part 4, and the relative position between the movable furnace body part 2 and the fixed furnace body part 1 can be adjusted by the connecting rod mechanism 3.
As shown in fig. 3 and 4, the fixed furnace body part1 comprises a fixed furnace body 101, a graphite cone 102, a graphite tube 103, a gas path joint 104, a lens barrel 105, an ultraviolet-transmitting quartz glass 106, a lens barrel end cover 107, an o-ring 108, a water tube joint 109 and a copper wire connecting terminal 110;
The ultraviolet-transmitting quartz glass I106 is pressed at one end of the lens barrel I105 through the lens barrel end cover I107, the other end of the lens barrel I105 is provided with the O-shaped sealing ring I108 and then is arranged in the mounting groove I101 a on one side end of the fixed furnace body 101, the mounting groove II 101b on the other side end of the fixed furnace body 101 is internally provided with the graphite cone I102, the graphite tube 103 is inserted into the graphite cone I102, the air passage joint I104 and the copper wire connecting terminal 110 are arranged on the side end face of the fixed furnace body 101, and the water pipe joint I109 is arranged on the lower end face of the fixed furnace body 101 and stretches into the base part 4.
As shown in fig. 5 and 6, the movable furnace body part 2 includes a movable furnace body 201, a second lens barrel 204, a second ultraviolet-transmitting quartz glass 205, a second lens barrel end cover 203, a second O-ring 206, a second graphite cone 207, a guide shaft 202, a second gas circuit connector 210, a second water pipe connector 211, a circuit connector 212, a connecting pin 213 of a connecting rod mechanism, a first fastening screw 214 and a third O-ring 215;
The ultraviolet-transmitting quartz glass II 205 is pressed and assembled with one end of the lens barrel II 204 through the lens barrel end cover II 203, the other end of the lens barrel II 204 is assembled with the O-shaped sealing ring II 206 and then is assembled in the mounting groove III 201a on one side end of the movable furnace body 201, the O-shaped sealing ring III 215 is sleeved on the other side end of the movable furnace body 201, the graphite cone II 207 is inserted and assembled in the mounting groove IV 201b on the other side end of the movable furnace body 201, the guide shaft 202 is fixedly assembled on the movable furnace body part 2, and the connecting rod mechanism connecting pin 213 is assembled on the movable furnace body 201 and connected with the connecting rod mechanism 3.
As shown in fig. 7, the link mechanism 3 includes a limit plate 301, a nut 302, a spring 303, a crank 304, a rotating shaft 305, a hinge 306, a handle 307, a link 308 and a shaft snap ring 309;
The crank 304 passes through holes on the rotating shaft 305 and the hinge 306, the spring 303 is sleeved on the crank 304, one end of the crank 304 passing through the hinge 306 is locked by a nut 302, the handle 307 is arranged on the rotating shaft 305, the hinge 306 is connected with a connecting rod 308, the connecting rod 308 is connected with the connecting pin 213 of the connecting rod mechanism, and the rotating shaft 305 is arranged on the base part 4.
As shown in fig. 8 and 9, the base member 4 includes a base 401, an electric bakelite fixing block 402, a linear bearing 403 and a second fastening screw 404, the linear bearing 403 is installed in a hole of the electric bakelite fixing block 402 and is pressed by the second fastening screw 404, and the base 401 and the electric bakelite fixing block 402 are connected by a screw 405.
The working procedure of this embodiment is: as shown in fig. 10, when the graphite furnace needs to be opened to replace a graphite tube, the knob handle 307 is rotated anticlockwise, the spring 303 sleeved between the crank 304 and the hinge 306 is compressed, the effective length of the crank 304 participating in the movement is shortened until the crank 304 continues to rotate anticlockwise and passes through a position collinear with the connecting rod 308 and then is lengthened, the knob handle 307 continues to rotate anticlockwise, the spring 303 slowly lengthens to drive the movable furnace body to be opened, and when the hinge is sprung by the spring 303 to be in contact with the limiting plate 301, the effective working length of the crank 304 reaches the maximum and remains unchanged, and the pretightening force of the spring can be adjusted through the nut 302.
When the graphite furnace needs to be closed, the knob handle 307 is rotated clockwise, the movable furnace body moves rightwards under the drive of the crank block mechanism, when the movable furnace body reaches the condition that two graphite cones I102 and II 207 positioned on the fixed furnace body 101 and the movable furnace body 201 are in contact with the graphite tube 103, the knob handle 307 is continuously rotated clockwise, the spring 303 is slowly compressed, at the moment, the length of the spring 303 reaches the shortest, the spring 303 is slowly lengthened after the spring 303 passes through the position, and after the upper protruding point of the connecting rod 308 is in contact with the bakelite fixing block 401, the spring 303 still has a certain elastic force, and the force can keep the two graphite cones I102 and II 207 to compress the graphite tube 103. When the graphite tube is heated and lengthened, the compression amount of the spring does not reach the maximum value, so the spring can be continuously compressed to compensate the elongation of the graphite tube, and the compression force applied to the graphite tube is not more than the increase amount of the spring force at the maximum value before heating and elongation, so the proper spring stiffness is selected to compensate the elongation of the graphite tube and play a role in compressing the graphite tube. For example, when a spring having a pitch diameter of 11mm, a wire diameter of 0.8mm, an effective number of turns of 6, and a total number of turns of 8 is selected, the rigidity thereof is about 0.506N/mm, and when the length of the graphite tube is increased by 2mm, the pressing force applied to the graphite tube is increased by only 1.12N at maximum. The compaction force before heating the graphite tube is 10.13N, so the graphite furnace atomizer device with the self-adaptive graphite tube length change can effectively compact the graphite tube and can also effectively prevent the graphite tube from breaking in the heating process.
Claims (3)
1. Self-adaptation formula graphite stove self-locking device, its characterized in that: the furnace comprises a fixed furnace body part (1), a movable furnace body part (2), a connecting rod mechanism (3) and a base part (4), wherein the fixed furnace body part (1) is arranged on the base part, the movable furnace body part (2) is connected with the base part (4), and the relative position between the movable furnace body part (2) and the fixed furnace body part (1) can be adjusted by the connecting rod mechanism (3);
The movable furnace body part (2) comprises a movable furnace body (201), a second lens cone (204), a second ultraviolet-transmitting quartz glass (205), a second lens cone end cover (203), a second O-shaped sealing ring (206), a second graphite cone (207), a guide shaft (202), a second gas circuit connector (210), a second water pipe connector (211), a circuit connector (212), a connecting pin (213) of a connecting rod mechanism, a first set screw (214) and a third O-shaped sealing ring (215);
the ultraviolet-transmitting quartz glass II (205) is pressed and assembled with one end of a lens barrel II (204) through a lens barrel end cover II (203), the other end of the lens barrel II (204) is provided with an O-shaped sealing ring II (206) and then is arranged in a mounting groove III (201 a) on one side end of the movable furnace body (201), the other side end of the movable furnace body (201) is sleeved with an O-shaped sealing ring III (215), a graphite cone II (207) is inserted and assembled in a mounting groove IV (201 b) on the other side end of the movable furnace body (201), a guide shaft (202) is fixedly assembled on a movable furnace body part (2), and a connecting rod mechanism connecting pin (213) is assembled on the movable furnace body (201) and connected with the connecting rod mechanism (3);
The connecting rod mechanism (3) comprises a limiting piece (301), a nut (302), a spring (303), a crank (304), a rotating shaft (305), a hinge (306), a handle (307), a connecting rod (308) and a snap ring (309) for the shaft;
The crank (304) passes through holes in the rotating shaft (305) and the hinge (306), a spring (303) is sleeved on the crank (304), one end of the crank (304) passing through the hinge (306) is locked by a nut (302), a handle (307) is arranged on the rotating shaft (305), the hinge (306) is connected with a connecting rod (308), the connecting rod (308) is connected with a connecting pin (213) of the connecting rod mechanism, and the rotating shaft (305) is arranged on the base part (4).
2. The self-locking device of the self-adaptive graphite furnace according to claim 1, wherein: the fixed furnace body part (1) comprises a fixed furnace body (101), a graphite cone I (102), a graphite pipe (103), an air passage connector I (104), a lens cone I (105), an ultraviolet-transmitting quartz glass I (106), a lens cone end cover I (107), an O-shaped sealing ring I (108), a water pipe connector I (109) and a copper wire connecting terminal (110);
The ultraviolet-transmitting quartz glass I (106) is pressed at one end of the lens barrel I (105) through a lens barrel end cover I (107), the other end of the lens barrel I (105) is provided with an O-shaped sealing ring I (108) and then is arranged in a mounting groove I (101 a) on one side end of the fixed furnace body (101), a graphite cone I (102) is arranged in a mounting groove II (101 b) on the other side end of the fixed furnace body (101), a graphite tube (103) is inserted into the graphite cone I (102), an air passage connector I (104) and a copper wire connecting terminal (110) are arranged at the side end face of the fixed furnace body (101), and a water pipe connector I (109) is arranged at the lower end face of the fixed furnace body (101) and stretches into the base part (4).
3. The self-locking device of the self-adaptive graphite furnace according to claim 1, wherein: the base component (4) comprises a base (401), an electric bakelite fixing block (402), a linear bearing (403) and a second fastening screw (404), wherein the linear bearing (403) is installed in a hole of the electric bakelite fixing block (402) and is pressed by the second fastening screw (404), and the base (401) is connected with the electric bakelite fixing block (402) through the screw (405).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711359882.0A CN107894397B (en) | 2017-12-18 | 2017-12-18 | Self-adaptive graphite furnace self-locking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711359882.0A CN107894397B (en) | 2017-12-18 | 2017-12-18 | Self-adaptive graphite furnace self-locking device |
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| CN107894397A CN107894397A (en) | 2018-04-10 |
| CN107894397B true CN107894397B (en) | 2024-08-23 |
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Citations (1)
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| CN208206765U (en) * | 2017-12-18 | 2018-12-07 | 上海仪电分析仪器有限公司 | Self-adapting type graphite furnace self-locking device |
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