阅读说明：本技术 一种自动凯式定氮仪用进样装置 (Automatic sampling device for triumph nitrogen determination instrument ) 是由 储涛 王军 于 2020-12-16 设计创作，主要内容包括：本发明公开了一种自动凯式定氮仪用进样装置,涉及凯式定氮仪领域,包括凯式定氮仪主体,所述凯式定氮仪主体的上部具有设备容纳腔室,设备容纳腔室的内底部安装有混液筒,混液筒中具有搅拌组件,且混液筒的底部具有放液管,放液管上安装有第一电磁阀,而放液管的底端延伸出设备容纳腔室的底部且伸入对接管的内顶部,对接管固定在设备容纳腔室的底面,且对接管底端与玻璃试管的顶部正对,设备容纳腔室顶部还设置有用于定量注入组件。本发明通过定量注入组件实现反应前精确控制量的目的以保证后续检测结果的精确性,并且这一过程中自动进行,降低实验人员的操作量,具有很强的推广效果。(The invention discloses a sample introduction device for an automatic triumph nitrogen determination instrument, which relates to the field of triumph nitrogen determination instruments and comprises a triumph nitrogen determination instrument main body, wherein an equipment accommodating cavity is arranged at the upper part of the triumph nitrogen determination instrument main body, a liquid mixing barrel is arranged at the inner bottom of the equipment accommodating cavity, a stirring assembly is arranged in the liquid mixing barrel, a liquid discharging pipe is arranged at the bottom of the liquid mixing barrel, a first electromagnetic valve is arranged on the liquid discharging pipe, the bottom end of the liquid discharging pipe extends out of the bottom of the equipment accommodating cavity and extends into the inner top of a butt joint pipe, the butt joint pipe is fixed at the bottom of the equipment accommodating cavity, the bottom end of the butt joint pipe is opposite to the top of a glass test tube, and a component for quantitative injection is further. The invention realizes the purpose of accurately controlling the quantity before reaction by the quantitative injection assembly so as to ensure the accuracy of the subsequent detection result, and the process is automatically carried out, thereby reducing the operation quantity of experimenters and having strong popularization effect.)

1. A sample introduction device for an automatic Kjeldahl apparatus comprises a Kjeldahl apparatus main body (1), wherein a test tube positioning seat (2) for placing a glass test tube (3) is arranged on the Kjeldahl apparatus main body (1), and acid liquid and alkali liquid are injected into the glass test tube (3), the sample introduction device is characterized in that an equipment accommodating chamber (4) is arranged at the upper part of the Kjeldahl apparatus main body (1), a liquid mixing cylinder (5) is fixedly arranged at the inner bottom of the equipment accommodating chamber (4), a stirring assembly is arranged in the liquid mixing cylinder (5), a liquid discharging pipe (14) is arranged at the bottom of the liquid mixing cylinder (5), a first electromagnetic valve (13) is fixedly arranged on the liquid discharging pipe (14), the bottom end of the liquid discharging pipe (14) extends out of the bottom of the equipment accommodating chamber (4) and extends into the inner top of a butt joint pipe (9), the butt joint pipe (9) is fixed at the bottom surface of the equipment accommodating chamber (4), the bottom end of the butt joint pipe (9) is opposite to the top of the glass test tube (3), the top of the equipment accommodating chamber (4) is also provided with a quantitative injection assembly, and the inner top of the equipment accommodating chamber (4) is also provided with a purification tank (19) for absorbing volatile gas in the liquid mixing cylinder (5);

the quantitative injection assembly comprises a measuring cylinder (10) with scale marks (20) on the outer surface, a liquid level sensor (22) used for detecting the height of the liquid level inside the measuring cylinder (10) is fixedly installed in the measuring cylinder (10), the top of the measuring cylinder (10) is connected with a liquid inlet pipe (11) in the bottom in a fixed mode, the bottom of the liquid inlet pipe (11) in the bottom is fixedly communicated with the top of a liquid mixing cylinder (5), the top of the liquid inlet pipe (11) in the top is fixedly communicated with a water inlet hopper (6) or a liquid inlet hopper (7), and a second electromagnetic valve (21) and a third electromagnetic valve (23) are respectively and fixedly installed in the liquid inlet pipe (11) on the upper portion and the liquid inlet pipe (11) on the lower portion of each quantitative injection assembly.

2. The sample introduction device for the automatic kjeldahl instrument according to claim 1, wherein the first electromagnetic valve (13), the second electromagnetic valve (21), the third electromagnetic valve (23) and the liquid level sensor (22) are all electrically connected to a PLC control mechanism built in a control panel on the kjeldahl instrument main body (1), the PLC control mechanism comprises a control mode that a set value is input from the control panel according to the amount of water or acid and alkali liquid to be injected, the PLC control mechanism sends a closing signal to the third electromagnetic valve (23) and sends an opening signal to the second electromagnetic valve (21), then the water is injected into the measuring cylinder (10) through the water inlet hopper (6) or the liquid inlet hopper (7), when the liquid level sensor (22) detects that the liquid level reaches the set value, the liquid level sensor (22) feeds back the signal to the PLC control mechanism, and then the PLC control mechanism sends an opening signal to the third electromagnetic valve (23), a closing signal is sent to the second electromagnetic valve (21).

3. The sample introduction device for the automatic kjeldahl apparatus according to claim 1, wherein the upper part of the equipment accommodating chamber (4) is further fixedly provided with a reagent feeding pipe (8), and the lower end of the reagent feeding pipe (8) is fixedly communicated with the liquid mixing cylinder (5).

4. The sampling device for the automatic Kai type azotometer according to claim 1, wherein the stirring assembly comprises a stirring rod (18) arranged in the middle of the liquid mixing cylinder (5), the stirring rod (18) is fixedly provided with a plurality of stirring rods (12), the top end of the stirring rod (18) extends out of the top of the equipment accommodating chamber (4) and is connected to the output shaft of a speed reducing motor (17) through a coupler, and the speed reducing motor (17) is fixedly arranged on one side of the top shell of the Kai type azotometer main body (1).

5. The automatic Kai type sampling device for azotometer of claim 1, wherein a proper amount of activated carbon particles (28) are stored in the purification tank (19), gauze (29) for preventing the activated carbon particles (28) from leaking is fixedly connected to the inner bottom surface of the purification tank (19), the bottom of the purification tank (19) is fixedly communicated with an air outlet hole formed in the top of the liquid mixing cylinder (5) through a plurality of uniformly distributed air ducts (30), and a plurality of exhaust pipes communicated with the outside atmosphere are also fixedly communicated with the top of the purification tank (19).

6. The sampling device for the automatic Kjeldahl apparatus of claim 1 or 5, wherein the inner top of the purification tank (19) is fixedly provided with an activated carbon filter screen (15).

7. The sample introduction device for the automatic Kjeldahl apparatus as claimed in claim 6, wherein the upper part of the stirring rod (18) penetrates through the purification tank (19), and the stirring screw (16) is fixedly sleeved on the stirring rod (18) in the purification tank (19).

8. The automatic Kai type sampling device for nitrogen determinator of claim 1, wherein a slot (31) for inserting the bottom of the glass test tube (3) is formed in the middle of the upper surface of the test tube positioning seat (2), one end of a plurality of first compression springs (33) are fixedly connected to the bottom surface of the slot (31) and are uniformly distributed, the other end of the first compression springs (33) faces upwards vertically and are fixedly connected with a supporting piece (32), the upper surface of the supporting piece (32) is used for placing and contacting the bottom surface of the glass test tube (3), and a limiting assembly used for keeping the glass test tube (3) in a vertical state is further arranged in the slot (31).

9. The sampling device of claim 8, wherein the limiting assembly comprises a plurality of mounting grooves (36) formed in the periphery of the top side of the slot (31), the mounting grooves (36) are uniformly arranged at equal angles, the bottom surface of each mounting groove (36) is fixedly connected with one end of a second pressure spring (35), the other end of each second pressure spring (35) is fixedly connected with a limiting bead (34), and the limiting bead (34) extends into the slot (31) after extending out of the corresponding mounting groove (36).

10. The automatic Kai type sampling device for azotometer of claim 1, wherein the lower edge of the inner peripheral surface of the bottom port of the butt joint pipe (9) is further fixedly connected with a fixing ring (24), the lower peripheral surface of the fixing ring (24) is compositely connected with a sealing ring (25) along the outer side, the inner peripheral surface of the top end of the glass test tube (3) is fixedly connected with a bearing ring (27), the upper peripheral surface of the bearing ring (27) is provided with a sealing groove (26) for the sealing ring (25) to abut into, when the sealing ring (25) abuts into the sealing groove (26), the first pressure spring (33) is in a compression state, so that when the glass test tube (3) is jacked up by means of the supporting sheet (32), the sealing groove (26) on the glass test tube is abutted against the sealing ring (25) right.

Technical Field

The invention relates to the field of Kai-type azotometers, in particular to a sample feeding device for an automatic Kai-type azotometer.

Background

The kjeldahl nitrogen determinator is an instrument for calculating the content of protein by measuring the content of nitrogen in a sample according to the principle that the content of nitrogen in protein is constant, and the method for measuring and calculating the content of protein is called kjeldahl nitrogen determination, and is called a kjeldahl nitrogen determinator, namely a nitrogen determinator, a protein determinator and a crude protein determinator.

In the measurement process, when adding strong base in order to neutralize the strong acid in the solution to current kjeldahl azotometer test tube, often need add the catalyst, generally set up magnetic stirring base on the test tube base like this and reach this effect, but the volume of current kjeldahl azotometer injection reaction liquid or water in to the test tube can't accurate control, and degree of automation is lower, increases experimenter's operating load.

Disclosure of Invention

The invention aims to provide a sample feeding device for an automatic Kjeldahl apparatus, which is used for solving the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a sample feeding device for an automatic Kjeldahl apparatus comprises a Kjeldahl apparatus main body, a test tube positioning seat for placing a glass test tube is arranged on the Kjeldahl apparatus main body, acid liquid and alkali liquid are injected into the glass test tube, the upper part of the triumph nitrogen determinator main body is provided with an equipment accommodating chamber, the inner bottom of the equipment accommodating chamber is fixedly provided with a liquid mixing cylinder, the liquid mixing cylinder is internally provided with a stirring assembly, the bottom of the liquid mixing cylinder is provided with a liquid discharging pipe, the liquid discharging pipe is fixedly provided with a first electromagnetic valve, the bottom end of the liquid discharge pipe extends out of the bottom of the equipment accommodating chamber and extends into the inner top of the butt joint pipe, the butt joint pipe is fixed on the bottom surface of the equipment accommodating chamber, the bottom end of the butt joint pipe is opposite to the top of the glass test tube, the top of the equipment accommodating chamber is also provided with a quantitative injection assembly, meanwhile, a purification tank for absorbing volatile gas in the liquid mixing barrel is arranged at the inner top of the equipment accommodating chamber;

the quantitative injection subassembly includes that the surface has the graduated flask of scale mark, and fixed mounting has a level sensor who is used for examining the inside liquid level height of graduated flask in the graduated flask, and the top and the equal fixed connection liquid pipe in bottom of graduated flask, the bottom mounting intercommunication that is in the liquid pipe of bottom is at the top of mixing a liquid section of thick bamboo, and the top that is in the liquid pipe of top is fixed to be linked together and is intake fill or feed liquor fill, and second solenoid valve and third solenoid valve respectively fixed mounting be in the liquid pipe of leading to liquid pipe and the lower part on upper portion in every quantitative injection subassembly.

As a further scheme of the invention: the utility model discloses a nitrogen analyzer, including first solenoid valve, the second solenoid valve, built-in PLC control mechanism in the equal electric connection kai formula azotometer main part of third solenoid valve and level sensor in the control panel, including following control mode among the PLC control mechanism, according to the water or acid and alkali liquid measure that will annotate and add from control panel input a setting value, PLC control mechanism sends closing signal to the third solenoid valve, send opening signal to the second solenoid valve, then pour into in the graduated flask through intaking fill or feed liquor fill, after level sensor detected the liquid level and reached the setting value, level sensor this moment with signal feedback to in the PLC control mechanism, then PLC control mechanism sends opening signal to the third solenoid valve, to sending closing signal to the second solenoid valve.

As a further scheme of the invention: the upper part of the equipment accommodating chamber is also fixedly provided with an agent feeding pipe, and the lower end of the agent feeding pipe is fixedly communicated with the liquid mixing barrel.

As a further scheme of the invention: the stirring assembly comprises a stirring rod arranged in the middle of the liquid mixing cylinder, a plurality of stirring rods are fixedly mounted on the stirring rod, the top end of the stirring rod extends out of the top of the equipment accommodating chamber and is connected onto an output shaft of a speed reduction motor through a coupler, and the speed reduction motor is fixedly mounted on one side of a top shell of the Kai-type azotometer main body.

As a further scheme of the invention: the purification device is characterized in that a proper amount of activated carbon particles are stored in the purification tank, gauze used for preventing the activated carbon particles from leaking down is fixedly connected to the inner bottom surface of the purification tank, the bottom of the purification tank is fixedly communicated with an air outlet hole formed in the top of the liquid mixing cylinder through air guide tubes uniformly distributed, and meanwhile a plurality of exhaust pipes communicated with the outside atmosphere are fixedly communicated to the top of the purification tank.

As a further scheme of the invention: and an active carbon filter screen is fixedly arranged at the inner top of the purification tank.

As a further scheme of the invention: the upper part of the stirring rod penetrates through the purification tank, and the stirring rod in the purification tank is fixedly sleeved with a stirring screw.

As a further scheme of the invention: the upper surface middle part of test tube positioning seat is seted up and is supplied glass test tube bottom male slot, and the first pressure spring one end of the setting of a plurality of equipartitions of basal surface fixedly connected with of slot, and the other end of first pressure spring is vertical upwards and fixedly connected with props the piece, props the upper surface of piece and is used for laying the bottom surface that contacts the glass test tube, still have the spacing subassembly that is used for keeping the vertical state of glass test tube in the slot.

As a further scheme of the invention: the limiting assembly comprises a plurality of mounting grooves formed in the peripheral portion of the top side of the slot, the mounting grooves are uniformly distributed at equal angles, the bottom surface of each mounting groove is fixedly connected with one end of a second pressure spring, the other end of each second pressure spring is fixedly connected with a limiting bead, and the limiting beads extend out of the corresponding mounting grooves and extend into the slot.

As a further scheme of the invention: the utility model discloses a sealing device, including butt joint pipe bottom mouth, fixed ring, sealing washer, supporting piece, sealing washer, fixed ring's lower global has a sealing washer along compound connection by the outside, and along fixedly connected with supporting ring on the top inner peripheral surface of glass test tube, the seal groove that is used for the sealing washer to support, when the sealing washer supports the seal groove, first pressure spring was in compression state this moment to when the glass test tube was with the help of the supporting piece top is risen, make its seal groove contradict just on the sealing washer.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the liquid level sensor injects the liquid into the measuring cylinder through the water inlet hopper or the liquid inlet hopper, when the liquid level sensor detects that the liquid level reaches a set value, the liquid level sensor feeds back a signal to the PLC control mechanism, then the PLC control mechanism sends an opening signal to the third electromagnetic valve and sends a closing signal to the second electromagnetic valve, so that the amount corresponding to the set value is added into the liquid mixing cylinder, the measurement error is reduced, the purpose of accurately controlling the amount before reaction is realized to ensure the accuracy of the subsequent detection result, the operation is automatically carried out in the process, the operation amount of experimenters is reduced, and the popularization effect is strong.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the constant-volume injection assembly according to the present invention;

FIG. 3 is a schematic view of the mounting of the retaining ring and the retainer ring of the present invention;

FIG. 4 is a schematic view of the installation of the seal ring of the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 1;

fig. 6 is an enlarged view of the structure at B in fig. 1.

In the figure: 1. a Kai-type azotometer main body; 2. a test tube positioning seat; 3. a glass test tube; 4. an equipment-receiving chamber; 5. a liquid mixing cylinder; 6. a water inlet hopper; 7. a liquid inlet hopper; 8. a dosing pipe; 9. butt-joint pipes; 10. a measuring cylinder; 11. a liquid pipe is communicated; 12. a stirring rod; 13. a first solenoid valve; 14. a liquid discharging pipe; 15. an active carbon filter screen; 16. agitating the helix; 17. a reduction motor; 18. a stirring rod; 19. a purification tank; 20. scale lines; 21. a second solenoid valve; 22. a liquid level sensor; 23. a third electromagnetic valve; 24. a fixing ring; 25. a seal ring; 26. a sealing groove; 27. a bearing ring; 28. activated carbon particles; 29. gauze; 30. an air duct; 31. a slot; 32. supporting the sheet; 33. a pressure spring; 34. a limiting bead; 35. a second pressure spring; 36. and placing the groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 6, in an embodiment of the present invention, a sample injection device for an automatic triumph nitrogen analyzer includes a triumph nitrogen analyzer main body 1, a test tube positioning seat 2 for placing a glass test tube 3 is disposed on the triumph nitrogen analyzer main body 1, the glass test tube 3 is used for injecting acid liquid and alkali liquid, an equipment accommodating chamber 4 is disposed at an upper portion of the triumph nitrogen analyzer main body 1, a liquid mixing cylinder 5 is fixedly mounted at an inner bottom of the equipment accommodating chamber 4, a stirring assembly is disposed in the liquid mixing cylinder 5, a liquid discharging pipe 14 is disposed at a bottom of the liquid mixing cylinder 5, a first electromagnetic valve 13 is fixedly mounted on the liquid discharging pipe 14, a bottom end of the liquid discharging pipe 14 extends out of the bottom of the equipment accommodating chamber 4 and extends into an inner top portion of a butt joint pipe 9, the butt joint pipe 9 is fixed at a bottom surface of the equipment accommodating chamber 4, a bottom end of the butt joint pipe 9 is opposite to a top portion of the glass test tube 3, a component for, meanwhile, a purification tank 19 for absorbing volatile gas in the liquid mixing cylinder 5 is arranged at the inner top of the equipment accommodating chamber 4;

the quantitative injection assembly comprises a measuring cylinder 10 with scale marks 20 on the outer surface, a liquid level sensor 22 used for detecting the liquid level inside the measuring cylinder 10 is fixedly mounted in the measuring cylinder 10, the top and the bottom of the measuring cylinder 10 are fixedly connected with a liquid passing pipe 11, the bottom end of the liquid passing pipe 11 at the bottom is fixedly communicated with the top of a liquid mixing cylinder 5, the top end of the liquid passing pipe 11 at the top is fixedly communicated with a water inlet hopper 6 or a liquid inlet hopper 7, and a second electromagnetic valve 21 and a third electromagnetic valve 23 are respectively and fixedly mounted in the liquid passing pipe 11 at the upper part and the liquid passing pipe 11 at the lower part in each quantitative injection assembly.

Further, the first electromagnetic valve 13, the second electromagnetic valve 21, the third electromagnetic valve 23 and the liquid level sensor 22 are all electrically connected with a PLC control mechanism arranged in a control panel on the Kai-type nitrogen determinator main body 1, the PLC control mechanism comprises a control mode that a set value is input from the control panel according to the amount of water or acid-base liquid to be injected, the PLC control mechanism sends a closing signal to the third electromagnetic valve 23 and sends an opening signal to the second electromagnetic valve 21, then the water is injected into the graduated cylinder 10 through the water inlet hopper 6 or the liquid inlet hopper 7, when the liquid level sensor 22 detects that the liquid level reaches the set value, the liquid level sensor 22 feeds back the signal to the PLC control mechanism, then the PLC control mechanism sends an opening signal to the third electromagnetic valve 23 and sends a closing signal to the second electromagnetic valve 21, so that the amount corresponding to the set value is added to the liquid mixing cylinder 5, the method reduces the measurement error, realizes the purpose of accurately controlling the quantity before reaction so as to ensure the accuracy of subsequent detection results, and automatically performs the process, reduces the operation quantity of experimenters, and has strong popularization effect.

Further, the upper part of the equipment accommodating chamber 4 is also fixedly provided with an agent feeding pipe 8, the lower end of the agent feeding pipe 8 is fixedly communicated with the liquid mixing cylinder 5, and the agent feeding pipe 8 is used for feeding solid particulate matters such as catalysts.

Further, the stirring assembly comprises a stirring rod 18 arranged in the middle of the mixing barrel 5, a plurality of stirring rods 12 are fixedly mounted on the stirring rod 18, the top end of the stirring rod 18 extends out of the top of the equipment accommodating chamber 4 and is connected to the output shaft of the speed reducing motor 17 through a coupler, the speed reducing motor 17 is fixedly mounted on one side of the top shell of the Kai-type azotometer main body 1, after quantitative liquid injection is completed, the first electromagnetic valve 13 is closed at the moment, the speed reducing motor 17 is opened to stir relevant reaction liquid and a catalyst in the mixing barrel 5, and the reaction speed is accelerated.

Further, a proper amount of active carbon particles 28 are stored in the purification tank 19, the bottom surface fixedly connected with gauze 29 used for preventing the active carbon particles 28 from leaking down is arranged in the purification tank 19, the bottom of the purification tank 19 is fixedly communicated with the air outlet hole formed in the top of the liquid mixing cylinder 5 through the air guide pipes 30 uniformly distributed in a plurality of ways, meanwhile, the top of the purification tank 19 is also fixedly communicated with a plurality of exhaust pipes communicated with the outside atmosphere, gas generated by reaction in the liquid mixing cylinder 5 is guided into the purification tank 19 through the exhaust pipes, and the active carbon particles 28 are fully adsorbed to achieve the treatment effect.

And furthermore, an active carbon filter screen 15 is fixedly arranged at the inner top of the purification tank 19, so that the purpose of adsorbing irritant and harmful and toxic gases is further achieved.

Still further, the upper portion of the stirring rod 18 penetrates through the purification tank 19, the stirring rod 18 in the purification tank 19 is fixedly sleeved with the stirring screw 16, and the activated carbon particles 28 can be turned over through the stirring screw 16, so that each adsorption surface of the activated carbon particles can participate in the adsorption and purification process, and the adsorption effect is guaranteed to the maximum extent.

Furthermore, the middle part of the upper surface of the test tube positioning seat 2 is provided with a slot 31 for inserting the bottom of the glass test tube 3, the bottom surface of the slot 31 is fixedly connected with one end of a plurality of first pressure springs 33 which are uniformly distributed, the other end of the first pressure spring 33 is vertically upward and fixedly connected with a supporting sheet 32, the upper surface of the supporting sheet 32 is used for placing and contacting the bottom surface of the glass test tube 3, the slot 31 is also internally provided with a limiting component for keeping the glass test tube 3 in a vertical state, the purpose of arranging the first pressure spring 33 below the supporting sheet 32 is that, because the supporting sheet 32 is directly contacted with the bottom surface of the glass test tube 3, when the glass test tube 3 needs to be placed on the test tube positioning seat 2, firstly the glass test tube 3 is slid into the slot 31 of the test tube positioning seat 2, then the glass test tube 3 is held to apply force and pressed downwards, so that the supporting sheet 32 compresses the first pressure spring 33, when the top end of the glass test tube, at this moment, slowly release glass test tube 3, first pressure spring 33 can resume the original state, will prop piece 32 and lift up to with glass test tube 3 jacking up, the straight drop stretches into the top of glass test tube 3 to the lower port of butt joint pipe 9, thereby makes the leading-in glass test tube 3 of exhaust reaction liquid in the bleeder line 14.

Still further, the limiting assembly comprises a plurality of mounting grooves 36 formed in the peripheral portion of the top side of the slot 31, the mounting grooves 36 are uniformly arranged at equal angles, the bottom surface of each mounting groove 36 is fixedly connected with one end of a second pressure spring 35, the other end of each second pressure spring 35 is fixedly connected with a limiting bead 34, and each limiting bead 34 extends out of the corresponding mounting groove 36 and extends into the slot 31, so that when the glass test tube 3 is drawn into the slot 31, the spherical surface of each limiting bead 34 can well slide with the outer surface of the glass test tube 3, the movement of the glass test tube 3 cannot be retarded, meanwhile, the limiting beads 34 can support the peripheral wall of the glass test tube 3 from all directions under the supporting effect of the second pressure springs 35, thereby the vertical state of the glass test tube 3 can be maintained, the glass test tube 3 is prevented from even falling down, and the slow release of the glass test tube 3 is facilitated, which can be smoothly butted against the butting pipe 9.

Further, the lower edge of the inner peripheral surface of the bottom port of the butt joint pipe 9 is further fixedly connected with a fixing ring 24, the lower peripheral surface of the fixing ring 24 is compositely connected with a sealing ring 25 along the outer side, the inner peripheral surface of the top end of the glass test tube 3 is fixedly connected with a bearing ring 27 along the inner peripheral surface, the upper peripheral surface of the bearing ring 27 is provided with a sealing groove 26 for the sealing ring 25 to abut into, when the sealing ring 25 abuts into the sealing groove 26, the first pressure spring 33 is in a compression state, so that when the glass test tube 3 is jacked up by the supporting sheet 32, the sealing groove 26 on the glass test tube is just abutted against the sealing ring 25, and as the first pressure spring 33 is in the compression state, the sealing groove 26 has a certain upward pressure on the sealing ring 25, so that the sealing ring 25 and the sealing groove 26 are kept in a tight fit state, and the purpose is to prevent the relevant acid volatile gas, thereby helping to ensure the physical health of the experimenter.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.