A multifunctional gas pre-treatment device

Abstract

The present invention discloses a multifunctional gas pre-treatment device, comprising: a positioning system, an air circuit system, a control system and a bottom plate; the positioning system is electrically connected to the control system; the positioning system is fixed on the bottom plate; the air circuit system comprises: a cylinder, a cylinder driving device, an injection system, a two-way vacuum valve, a three-way air inlet valve, a three-way selection valve, a vacuum pump, a gas sampling pump, a sample gas bag, and a nitrogen pressure-stabilizing valve; the air inlet of the vacuum pump is connected to the exhaust port of the three-way selection valve through the two-way vacuum valve; the sample gas bag is connected to the exhaust port of the three-way air inlet valve through the air sampling pump; the air inlet of the three-way air inlet valve is connected to the air outlet of the nitrogen pressure-stabilizing valve; the air outlet of the three-way air inlet valve is connected to the air inlet of the three-way selection valve; the air outlet of the three-way selection valve is connected to the injection system. The present invention integrates multiple gas pre-treatment functions, and can realize the functions of gas sample preparation, sample bottle vacuuming, gas dilution, and sample bottle cleaning through simple operations.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and more particularly to a multifunctional gas pre-processing device. Background Art

[0002] Human activities will emit various gases into the atmosphere, such as air conditioning refrigerant Freon; sulfur dioxide, hydrogen sulfide, carbon dioxide, carbon monoxide produced by steelmaking and coal burning; nitrous oxide produced by cement manufacturing or agricultural soil fertilization; methane produced by rice planting or coal mining, etc., will pollute the atmospheric environment, and air pollution prevention and control is urgent. Sampling, analyzing and monitoring the emitted polluted gases is a prerequisite for studying gas pollution and carrying out targeted prevention and control, but the concentration of many gases in the atmosphere is very low, and the sample gas needs to be sampled and sent to the laboratory for analysis using special instruments. Before the gas sample is collected or sent to the instrument for analysis, the gas sample needs to be pre-treated in order to perform large-scale automatic analysis. Glass containers can be used as the preferred container for loading trace gas samples because of their low gas adsorption. They are also the preferred containers for automated gas sampler analysis. Before sampling, the gas sample bottle needs to be cleaned with high-purity inert gas; after cleaning, the sample bottle needs to be evacuated to hold the gas sample to be collected; when the concentration of some sample gases is too high or the amount of gas samples collected is very small and does not meet the detection limit or minimum sample amount of the instrument analysis, the gas sample needs to be diluted with high-purity inert gas that does not affect the target gas analysis; moreover, some gas samples are in other containers such as sampling gas bags, gas tanks, syringes, etc., which are not suitable for the requirements of instrument batch analysis, and the samples need to be prepared in sample bottles that are matched with standard analytical instruments. In response to these needs before the collection and analysis of large quantities of gas samples, an efficient and automated pre-treatment device is required to improve the efficiency of gas sample collection and analysis.

[0003] Therefore, how to provide an efficient, automated, multifunctional gas pretreatment device is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention provides a multifunctional gas pretreatment device, which adopts a control system, a gas path system and a positioning system to realize functions such as gas sample preparation, gas dilution, sample bottle vacuuming, and sample bottle cleaning.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A multifunctional gas pre-treatment device comprises: a positioning system, a gas path system, a control system and a bottom plate; the positioning system is electrically connected to the control system; the positioning system is fixed on the bottom plate;

[0007] The gas circuit system includes: a cylinder, a cylinder driving device, an injection system, a two-way vacuum valve, a three-way air inlet valve, a three-way selection valve, a vacuum pump, a gas sampling pump, a sample gas bag, and a nitrogen pressure stabilizing valve;

[0008] The air inlet of the vacuum pump is connected to the exhaust port of the three-way selection valve through the two-way vacuum valve; the sample gas bag is connected to the exhaust port of the three-way air inlet valve through the air sampling pump; the air inlet of the three-way air inlet valve is connected to the air outlet of the nitrogen pressure-stabilizing valve; the air outlet of the three-way air inlet valve is connected to the air inlet of the three-way selection valve; the air outlet of the three-way selection valve is connected to the injection system;

[0009] The cylinder is fixed on the positioning system and connected to the cylinder control device;

[0010] The injection system is connected to the cylinder;

[0011] The cylinder driving device, the two-way vacuum valve, the three-way air inlet valve, the three-way selection valve, the vacuum pump, and the air collection pump are electrically connected to the control system respectively.

[0012] Further, in the above-mentioned multifunctional gas pre-treatment device, the cylinder control device includes: a three-way needle inlet valve, a three-way needle return valve and an air pressure-stabilizing valve; the three-way needle inlet valve outlet and the three-way needle return valve outlet are respectively connected to the cylinder; the three-way needle inlet valve inlet and the three-way needle return valve inlet are connected to the air pressure-stabilizing valve outlet through a three-way joint; the air pressure-stabilizing valve inlet is connected to compressed air; the three-way needle inlet valve and the three-way needle return valve are respectively electrically connected to the control system;

[0013] The cylinder comprises: a cylinder barrel, a piston, and a cylinder shaft; the piston divides the cylinder into an upper air chamber and a lower air chamber;

[0014] The upper air chamber is communicated with the air outlet of the three-way needle valve, and the lower air chamber is communicated with the air outlet of the three-way needle valve;

[0015] One end of the cylinder shaft is connected to the piston, and the other end is connected to the injection system;

[0016] A needle position probe is installed on the top of the cylinder; a needle position magnet is installed on the piston; the needle position probe is electrically connected to the control system;

[0017] The injection system comprises: a needle seat and an injection needle, one end of the needle seat is connected to the cylinder shaft, and the other end is connected to the injection needle, and the interior of the needle seat is connected to the air outlet of the three-way selection valve.

[0018] Furthermore, both ends of the needle seat are external threads, and the middle is a hexagonal prism. The upper external thread is connected to the cylinder shaft, and the lower external thread is connected to the internally threaded injection needle. There is a 90-degree gas channel inside the needle seat that connects the center of the needle's external thread and the center of one of the faces of the hexagonal prism, and there is also a gas pipe joint on the prism surface. The needle is processed with threads inside, and is connected to the needle seat through these threads; there is a conical sealing ring with a circular hole in the middle inside the needle, which fits the needle seat, the threaded end face and the conical surface inside the needle to form a sealed space.

[0019] Further, in the above-mentioned multifunctional gas pre-treatment device, the positioning system includes: a sample plate, a gear plate, a cylinder arm, a central axis device, a side axis device, a sliding arm, a gear and a power device;

[0020] The sample tray and the gear tray are both fixedly mounted on the central axis device, and the sample tray is located on the upper part of the gear tray; the sample tray is provided with bottle holes distributed in an involute line; and the gear tray surface is provided with slide grooves corresponding to the bottle holes;

[0021] The central axis device and the side axis device are both vertically mounted on the bottom plate;

[0022] The slide arm and one end of the cylinder arm are both mounted on the side axis device, and the slide arm is parallel to the cylinder arm; a guide head is fixedly arranged on the slide arm, and the guide head slides in the slide groove; the cylinder is fixed on the cylinder arm;

[0023] The gear is connected to the power device, and the gear is matched with the gear plate.

[0024] Further, in the above-mentioned multifunctional gas pre-treatment device, the slide arm includes: an upper slide and a lower slide, the upper slide and the lower slide are fixedly mounted on the side axis device, the upper slide and the lower slide are PCB circuit boards with components welded thereon, and the guide head is arranged on the upper slide;

[0025] The upper slide and the lower slide are electrically connected to the control system via conductive wires respectively;

[0026] The starting position and the ending position of the slide slot are respectively provided with a starting magnet and a final magnet; the upper slide is provided with a starting probe and a final probe; the starting probe and the final probe are both electrically connected to the control device.

[0027] Furthermore, in the above-mentioned multifunctional gas pretreatment device, a capacitive grid displacement sensor is welded on the upper slide, the head of the capacitive grid displacement sensor is located in the guide head, and a capacitive grid circuit is pasted inside the slide groove; the capacitive grid displacement sensor is powered by the upper slide.

[0028] Furthermore, in the above multifunctional gas pre-treatment device, the central axis device comprises: a central axis bearing portion and a central axis rod; the lower end of the central axis rod is fitted in the central axis bearing portion; and the sample plate and the gear plate are both fixedly mounted on the central axis rod;

[0029] The paraxial device comprises: a paraxial bearing part and a paraxial rod; the lower end of the paraxial rod is fitted in the paraxial bearing part; and the upper slide plate and the lower slide plate are both fixedly sleeved on the paraxial rod;

[0030] Furthermore, the central axis bearing portion and the side axis bearing portion are both vertically mounted on the bottom plate.

[0031] Furthermore, a through-shaft hole is provided at the center of one end of the cylinder arm, so that the cylinder shaft and the connected needle seat can pass smoothly. A locking hole is provided at the center of the other end of the cylinder arm, and a locking threaded hole is provided on the side of the locking hole away from the through-shaft hole. The cylinder arm can be exactly sleeved on the side shaft rod through the locking hole, and the cylinder arm can slide up and down on the side shaft rod. When sliding to a suitable height position, a long screw can be screwed into the locking threaded hole to clamp and lock the cylinder arm on the side shaft rod. There is also a locking hole notch on the other side of the corresponding locking hole, so that the locking clamping deformation force can be evenly distributed, making it easier to clamp and tighten.

[0032] Furthermore, the injection system further comprises an adjusting rod and a bottle blocking piece, wherein the bottle blocking piece is a metal piece with a central hole and two side holes; the cylinder is fixed to the cylinder arm through the adjusting rod; there are at least two adjusting rods, which are symmetrically arranged, and the adjusting rod comprises: a screw, a nut and a screw, wherein one end of the screw is an external thread, the other end is a hexagonal prism on the outside and an internal thread on the inside; one end of the external thread of the screw passes through the cylinder arm and is connected to the cylinder and is locked with a nut; the screw passes through the side hole of the bottle blocking piece and is screwed into the internal thread of the screw;

[0033] A headspace bottle is placed in the bottle position hole, a small hole is arranged in the middle of the bottle cap of the headspace bottle, and a rubber sealing pad is arranged in the bottle cap; the injection needle passes through the central hole of the bottle blocking plate and corresponds to the middle small hole of the bottle cap of the headspace bottle in the vertical direction; a rectangular small hole is arranged on the side wall of the needle tube of the injection needle near the needle tip to prevent the needle tube from being blocked by foam generated when the needle pierces the rubber sealing pad.

[0034] Furthermore, in the above-mentioned multifunctional gas pretreatment device, the central axis bearing component and the side axis bearing component are the same, both comprising: a bearing seat, a bearing and a shaft cylinder; the upper portion of the bearing seat is open, cylindrical, hollow, and has an external threaded interface at the bottom, which is screwed to the base plate through the external threaded interface; the bottom of the bearing sleeve is connected to the inside of the base plate and has an annular depression; there are two bearings, which are respectively located at the upper and lower ends of the bearing seat; the shaft cylinder is a hollow cylinder with an inner diameter larger than the inner diameter of the bearing, and is located between the two bearings, and the two end faces of the shaft cylinder are in close contact with the inner ring end faces of the upper and lower bearings; the central axis rod and the side axis rod pass through the inner holes of the bearing and the shaft cylinder.

[0035] Furthermore, in the above-mentioned multifunctional gas pretreatment device, the sample plate and the gear plate are mounted on the central axis through a plate seat, and the plate seat includes: a locking hole located in the center, screw holes located in the four corners and a locking nail hole located on one side, a locking hole notch is provided on one side of the locking hole, and a penetrating locking hole through groove is provided on the other side corresponding to the locking hole notch, and the locking nail hole is perpendicular to the locking hole through groove; screw holes consistent with the screw holes are provided on the gear plate and the sample plate.

[0036] Furthermore, in the above-mentioned multifunctional gas pretreatment device, the sample plate includes an upper plate, a middle plate, a lower plate, a single-way copper column, a double-way copper column and fixing screws; the middle plate is arranged in the middle of the upper plate and the lower plate, and is connected by a single-way copper column, a double-way copper column and fixing screws; the upper plate and the middle plate have the same structure, a central axis hole is arranged at the center position, and bottle position holes arranged in an involute manner are arranged on the plate surface; except that the bottle position holes are not arranged on the lower plate, the other structures are the same as those of the upper plate.

[0037] Furthermore, in the above-mentioned multifunctional gas pretreatment device, the control system includes a control panel and a single-chip microcomputer, and the control panel is connected to the single-chip microcomputer with a wiring harness; the positioning system, two-way vacuum valve, three-way air intake valve, three-way selection valve, vacuum pump, gas sampling pump, and cylinder drive device are respectively connected to the single-chip microcomputer with conductive wires and are controlled by the program in the single-chip microcomputer.

[0038] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention can realize a multifunctional integrated structure, and can achieve the purposes of gas sample preparation, sample bottle vacuuming, gas dilution, and sample bottle cleaning through simple operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 The accompanying drawing is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 The accompanying drawing is a schematic diagram of the gas path system structure of the present invention;

[0043] Figure 3 The accompanying drawing is a schematic diagram of the cylinder arm structure of the present invention;

[0044] Figure 4 The accompanying drawing is a schematic diagram of the gear plate structure of the present invention;

[0045] Figure 5 The accompanying drawing is a schematic diagram of the structure of the disc on the sample tray of the present invention;

[0046] Figure 6 The accompanying drawing is a schematic diagram of the disc seat structure of the present invention.

[0047] Among them, in the figure,

[0048] 1-control panel; 2-single chip microcomputer; 3-three-way needle inlet valve; 4-three-way needle outlet valve; 5-air pressure regulating valve; 6-two-way vacuum valve; 7-three-way air inlet valve; 8-three-way selection valve; 9-vacuum pump; 10-gas sampling pump; 11-sample gas bag; 12-nitrogen pressure regulating valve; 13-sample plate; 131-upper plate; 132-middle plate; 133-lower plate; 134-shaft sleeve hole; 135-bottle position hole; 14-gear plate; 141-slideway; 142-starting magnet; 143-final magnet; 14 4-capacitor gate circuit; 15-cylinder; 151-piston; 152-upper air chamber; 153-lower air chamber; 16-cylinder arm; 17-middle axis rod; 18-side axis rod; 19-needle seat; 20-injection needle; 21-needle position probe; 22-slide arm; 221-upper slide; 222-lower slide; 23-guide head; 24-intake pipe; 25-bottom plate; 26-motor; 27-gear; 28-adjusting rod; 29-bottle stopper; 30-disc seat; 31-bearing seat; 32-bearing; 33-shaft cylinder. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example

[0051] like Figure 1-6 As shown, the main components of the device of the present invention are:

[0052] 1) Control system: mainly includes control panel 1 and single chip microcomputer (Hongjing STC12C5A series) 2; and control panel 1, motor 26 (planetary reduction motor), gas pump 10, vacuum pump 9, three-way air inlet valve 7, three-way selection valve 8, two-way vacuum valve 6, needle position probe 21, three-way needle inlet valve 3, three-way needle retracting valve 4, upper slide 221 and lower slide 222 are respectively connected to single chip microcomputer 2 by conductive wires and controlled by the program in single chip microcomputer 2. Control panel 1 is connected to single chip microcomputer 2 by flat cable, with LCD screen to display information and buttons to input parameters or commands. The end position probe, the start position probe and the needle position probe 21 are all Hall sensors that can obtain position information through magnetic induction; the upper slide 221 and the lower slide 222 are long rectangular PCB circuit boards with components welded on them, the end position probe, the start position probe and the capacitive gate displacement sensor are welded on the upper slide 221, and are all powered by the upper slide 221, and the capacitive gate displacement sensor head is located in the guide head 23. The capacitor gate circuit 144 is adhered to the sliding groove 141 of the gear plate 14 by adhesive.

[0053] 2) Gas system (such as Figure 2 shown):

[0054] The three-way air inlet valve 7, three-way selection valve 8, three-way needle inlet valve 3, and three-way needle outlet valve 4 are all normally closed two-position three-way solenoid valves. This valve has three interfaces, namely the air inlet, air outlet, and exhaust port. The exhaust port is located at the top of the valve. When the valve is closed and not powered on, the air inlet is sealed by a sealing gasket, and gas cannot pass through, while the air outlet and the exhaust port are connected in air path; when the valve is powered on, the air inlet and the air outlet are connected, while the exhaust port is not connected; the two-way vacuum valve 6 is a normally closed two-position two-way solenoid valve, which has only an air inlet and an air outlet. When the valve is closed and not powered on, the air inlet and the exhaust port are not connected in air flow, and when the valve is powered on and opened, the air inlet and the air outlet are connected. The air path connection is as follows Figure 2As shown, the air inlet of the two-way vacuum valve 6 is connected to the vacuum pump 9, and the air outlet is connected to the exhaust port of the three-way selection valve 8, the air outlet of the three-way selection valve 8 is connected to the needle seat 19, the air inlet of the three-way selection valve 8 is connected to the air outlet of the three-way air inlet valve 7, the exhaust port of the three-way air inlet valve 7 is connected to the air outlet of the air pump 10, and the air inlet of the three-way air inlet valve 7 is connected to the nitrogen pressure-stabilizing valve 12; the air outlet of the three-way needle inlet valve 3 is connected to the upper air chamber 152 of the square cylinder 15, its air inlet is connected to the three-way joint, and the exhaust port is connected to the atmosphere; the air outlet of the three-way needle retreat valve 4 is connected to the lower air chamber 153 of the square cylinder 15, its air inlet is connected to the other interface of the three-way joint, and the exhaust port is connected to the atmosphere;

[0055] Figure 2 The structure of the needle injection system is also shown. Both ends of the needle seat 19 are external threads, and the middle is a hexagonal prism. The upper external thread is connected to the cylinder shaft, and the lower external thread is connected to the internal threaded injection needle 20 (side hole needle). There is a 90-degree gas channel hole connecting the inner center of the needle external thread and the center of one of the faces of the hexagonal prism inside the needle seat 19, and there is also a trachea joint (intake pipe 24) on the prism surface. The injection needle 20 is processed with threads inside, and is connected to the needle seat 19 through this thread. A rectangular small hole is processed on the side wall of the needle tube near the needle tip to prevent the needle from piercing the rubber sealing pad and generating foam to block the needle tube. There is a conical sealing ring with a circular hole in the middle inside the needle, and the threaded end face of the needle seat 19 and the conical surface inside the injection needle 20 are fitted to form a sealed space.

[0056] The adjusting rod 28 is in the shape of a long rod, one end of which is an external thread, and the other end is a hexagonal prism with an internal thread on the outside; the bottle blocking piece 29 is in the shape of a rectangular metal sheet, and there is a small round hole in the center of the sheet that allows the injection needle 20 to pass smoothly, and this small hole also has the function of straightening the needle; there is a screw hole in the middle of the left and right ends of the bottle blocking piece 29, and the screw passes through the bottle blocking piece 29 and is screwed into the internal thread of the adjusting rod 28. A hexagonal nut is first screwed into the external thread of the adjusting rod 28 as a lock, and then the external thread of the adjusting rod 28 is passed through the fixing hole on the cylinder arm 16 and screwed into the threaded fixing hole on the square cylinder 15. Figure 3 The structure of the cylinder arm 16 is shown. When the height of the bottle blocking piece 29 needs to be adjusted, first loosen the fixing screws and locknuts, then rotate the hexagonal prism on the adjusting rod 28, rotate the adjusting rod 28 clockwise to screw the external thread into the cylinder thread hole, the position of the adjusting piece is raised, rotate the adjusting rod 28 counterclockwise to screw the external thread out of the cylinder thread hole, the position of the adjusting piece is lowered, and adjust until the needle tip is just hidden in the small hole of the bottle blocking piece 29 when the needle is in the uppermost position, and the positions of the adjusting rods 28 on both sides are at the same height, and then tighten the locknuts and screws in sequence.

[0057] After the compressed air passes through the air pressure regulating valve 5 and the three-way joint, it supplies air to the three-way needle valve 3 and the three-way needle valve 4. Figure 2As shown, when needle insertion is required, the three-way needle injection valve 3 is opened, and the compressed gas enters the upper air chamber 152 through the upper air inlet of the square cylinder 15, while the lower air chamber 153 is at normal pressure. The compressed gas pushes the piston 151 and the cylinder shaft inside the cylinder to move downward, and drives the needle seat 19 and the injection needle 20 to move downward together. The needle pierces the rubber sealing ring of the head space bottle below and extends into the head space bottle. At this time, the three-way needle injection valve 3 is closed, so that the compressed gas in the upper air chamber 152 is discharged through the exhaust port of the three-way needle injection valve 3, keeping the upper air chamber 152 at normal pressure, and completing the needle insertion action. When the needle needs to be withdrawn, the three-way needle withdrawal valve 4 is opened, and the compressed gas enters the lower air chamber 153 of the square cylinder 15, pushing the piston 151 and the cylinder shaft to move upward, and driving the needle seat 19 and the injection needle 20 to move upward. At this time, the injection needle 20 is in the headspace bottle. Due to the friction between the rubber seal in the headspace bottle cap and the needle, the headspace bottle is also driven to move upward. When the headspace bottle cap contacts the bottle stopper 29, the bottle stopper 29 prevents the headspace bottle from moving further upward, so that the injection needle 20 overcomes the friction resistance and is pulled out from the rubber seal and the needle tip is hidden in the bottle stopper 29. When the piston 151 rod moves to the uppermost part, the small circular magnet located at the center of the top of the piston 151 rod approaches the needle position probe 21 fixed on the top of the square cylinder, indicating that the needle has moved into place. At this time, the system closes the three-way needle withdrawal valve 4, and the compressed gas in the lower air chamber 153 is discharged from the exhaust port of the three-way needle withdrawal valve 4, completing the needle withdrawal action.

[0058] Figure 3 The cross-sectional view of the cylinder arm 16 is shown. The square cylinder fixing hole is used to fix the square cylinder, and the large circular hole in the middle allows the cylinder shaft and the connected needle seat 19 to pass smoothly. There is a cylinder arm 16 locking hole at the left end of the cylinder arm 16, through which the cylinder arm 16 can be exactly sleeved on the side shaft rod 18, and the cylinder arm 16 can slide up and down on the side shaft rod 18. When sliding to a suitable height position, a long screw can be screwed into the locking threaded hole to clamp and lock the cylinder arm 16 on the side shaft rod 18. There is also a locking hole notch on the other side of the corresponding locking hole, which can make the locking clamping deformation force evenly distributed and easier to clamp and tighten.

[0059] 3) Positioning system

[0060] Figure 4 The structural diagram of the gear plate 14 is listed, Figure 5 The structure diagram of the disc 131 on the sample disc 13 is listed. Figure 4As shown, the gear plate 14 is in the shape of a disk, with a large circular hole in the center and four chassis fixing holes. The gear plate 14 can be locked on the disk seat 30 by screws, and the disk seat 30 is then locked on the central axis by long screws. A circle of gears is evenly distributed on the outer ring of the gear plate 14. A slide groove 141 is processed in an involute shape on the front of the gear plate 14. A cylindrical starting magnet 142 and a final magnet 143 are buried at the starting position of the outer ring of the slide groove 141 and the end position of the inner ring of the slide groove 141, respectively, to indicate the starting position and the end position of the slide groove 141. A capacitive gate circuit 144 with adhesive backing is pasted in the middle of the inner part of the slide groove 141, which can be used to indicate the displacement of the slider in the slide groove 141.

[0061] Figure 5 1 is a structural diagram of the upper disc 131 of the sample disc 13. There is a large circle (sleeve hole 134) and four screw fixing holes in the middle of the upper disc 131. The disc can be fixed to the disc base 30 by screws, and then the disc base 30 is fixed to the sleeve by long screws. The structure of the middle disc 132 is the same as that of the upper disc 131, and the lower disc 133 is the same as that of the upper disc 131 except that there is no bottle position hole 135.

[0062] Figure 6 The upper disc 131 or the lower disc 133 can be fixed to the disc base 30 by screws, the sleeve passes through the locking hole, and the sleeve of the sample disc 13 can be clamped and locked on the disc base 30 by screwing the locking pin into the locking pin hole.

[0063] The structure of the sample tray 13 is as follows: Figure 1 As shown, the sample plate 13 is mainly composed of an upper plate 131, a middle plate 132, a lower plate 133, a plate sleeve, a plate seat 30, a single-pass copper column, a double-pass copper column and fixing screws. Figure 5 As shown, there are four screw holes on the outer ring of the upper disk 131, and the upper part of the upper disk 131 is connected to the single-pass copper column by screws, and the upper disk 131 is clamped between the screws and the single-pass copper column, the middle disk 132 is clamped by the external thread end of the single-pass copper column and the double-pass copper column, and the lower disk is clamped by screws and the double-pass copper column. The four single-pass copper columns and the double-pass copper columns and the locking screws connect the outer rings of the three disks, and in the center of the disk, the upper disk 131 and the lower disk 133 are fixed to the disk base 30 with screws, and then the disk shaft sleeve is passed through the upper disk base 30, the middle disk 132 and the lower disk base 30, and is locked to the disk shaft sleeve by the screws of the upper disk base 30 and the lower disk base 30.

[0064] The structures of the central axis rod 17 and the side axis rod 18 are as follows: Figure 1As shown in . The components of the middle shaft include a bearing seat 31, a bearing 32, a shaft cylinder 33, a shaft seat hole, a middle shaft rod 17, a keyway and a hand-tightened locking pin. The components of the side bearing include a bearing seat 31, a bearing 32, a shaft cylinder 33, a shaft seat hole, and a side shaft rod 18; the bearing seats 31 of the two shafts have the same structure, with an opening at the top, a cylindrical shape, and a hollow center. There is an external threaded interface at the bottom, which can be screwed onto the bottom plate 25 through the external threaded interface. There is an annular depression at the bottom of the bearing sleeve connected to the inside of the bottom plate 25, which is convenient for the outer ring of the bearing seat 31 to reduce the contact area between the shaft and the bottom plate 25, keep the bearing seat 31 in close contact with the bottom plate 25 and perpendicular to the bottom plate 25; there are two small round holes on the middle side wall of the bearing seat 31, which is convenient for using a rod-shaped tool (such as a screwdriver) to reach into the hole to help tighten or loosen the bearing seat 31 thread and remove it. The assembly structure of the middle shaft and the side shaft is also shown in Figure 1 As shown, the bottom end of the central axis rod 17 is sequentially fitted with a bearing, a shaft cylinder 33 and another bearing, the inner ring of the bearing is in close contact with the central axis rod 17, and the shaft cylinder 33 is a hollow cylindrical shape, the two end faces of the shaft cylinder 33 are in contact with the inner ring end face of the bearing, but not in contact with the central axis rod 17, supporting the upper and lower bearings, keeping the central axis rod 17 vertical, and allowing the central axis rod 17, the inner ring of the bearing and the shaft cylinder 33 to rotate smoothly at the same time. Then, the central axis rod 17 with the bearing and the shaft cylinder 33 is pressed into the bearing seat 31, so that the outer rings of the upper and lower bearings are in close contact with the inner wall of the bearing seat 31, so that the central axis rod 17 can rotate smoothly in the bearing seat 31. The assembly method of the side shaft is the same as that of the central shaft. There is also a long rounded groove on the central axis 17, in which a standard rounded flat key can be placed. After the rounded flat key is placed inside, half of its height protrudes from the surface of the axis. When the disk sleeve of the sample disk 13 is placed on the central axis, the protruding rounded flat key can be stuck in the notch on the disk sleeve, and a hand-tightened locking pin can be screwed into the top of the disk sleeve to accurately position the sample disk 13 on the central axis 17.

[0065] Positioning principle: During assembly, the cylinder arm 16 and the sliding arm 22 are coaxially fixed on the side axis rod 18, the vertical position of the needle is consistent with the vertical position of the guide head 23, and the sample plate 13 and the gear plate 14 are also coaxially fixed on the central axis rod 17. When positioning is required, the single chip microcomputer 2 detects the position of the guide head 23 in the slide arm 22 based on the starting position probe on the slide arm 22. When the position does not meet the specific position, the single chip microcomputer 2 drives the planetary reduction motor 26 to rotate, and the gear 27 on the motor 26 drives the gear disk 14 to rotate, and the sample disk 13 fixed on the central axis rotates coaxially. Moreover, since the guide head 23 on the slide arm 22 is in the slide groove 141 of the gear disk 14, the slide groove 141 distributed in an involute line will push the guide head 23, and the guide head 23 pushes the slide arm 22, and the slide arm 22 pushes the side axis rod 18 to rotate. The side axis rod 18 drives the coaxially fixed cylinder arm 16 to rotate, and the cylinder arm 16 drives the needle head to move to the top of the corresponding slide groove 141. When the guide head 23 slides in the slide groove 141, the capacitive displacement sensor in the guide head 23 records its displacement distance. When the moving distance is reached, the movement stops, so that the needle position stops at the corresponding hole position on the sample disk 13, and the positioning of the needle position is completed.

[0066] Moreover, since the grooves of the gear plate 14 are involute distribution, the speed of the guide head 23 in the outer and inner circles of the slide groove 141 will be very different during gear transmission. The single-chip computer 2 system will record the position of the plate according to the involute function, adjust the speed of the motor 26, and control the moving speed of the guide head 23 in the slide groove 141. When it is far away from the target bottle position, it will run at a high speed, and when it is close to the target bottle hole position, it will reduce the speed to prevent the rotation inertia from being too large and affecting the positioning accuracy. After using the capacitive grid positioning, the maximum moving speed can reach 1.8 meters per second, and the displacement resolution can reach 0.02 millimeters, which can change the speed to quickly and accurately locate the position of the sample bottle.

[0067] 4) Main process of function realization

[0068] When the planetary gear motor 26 rotates to the corresponding sample bottle position,

[0069] (1) Realization of vacuum pumping function: Turn on the vacuum pump 9 for preheating, open the three-way needle valve 3, and use the air pressure regulating valve 5 to compress the gas into the upper air chamber 152 of the square cylinder, drive the needle to pierce the vacuum bottle, close the three-way needle valve 3 to allow the compressed gas in the upper air chamber 152 to be discharged from the exhaust port of the three-way needle valve 3, open the two-way vacuum valve 6, and the gas in the sample bottle is evacuated under the suction of the vacuum pump 9. After a certain period of time, when the required vacuum degree is reached, close the two-way vacuum valve 6, and open the three-way exhaust port. Needle valve 4, compressed air enters lower air chamber 153, drives cylinder shaft to move upward, friction between needle tube and rubber seal drives sample bottle to move upward, bottle cap is blocked by bottle blocking piece 29, makes needle head pull out from sample bottle, sample bottle falls back to position under gravity, when cylinder shaft returns to top, needle position probe 21 detects needle head returns to position, closes three-way needle valve 4, compressed air in lower air chamber 153 is discharged from exhaust port of three-way needle valve 4, completes vacuuming of sample bottle. Then, under the action of planetary reduction motor 26, it rotates to next bottle position to start vacuuming. When all sample bottles in a batch have been evacuated, the vacuum pump 9 needs to be turned off. Since the two-way vacuum valve 6 is closed at this time, the inside of the vacuum pump 9 that has just been shut down is in a vacuum state, and the pump tube is prone to oil return. The program setting is required to balance the pressure in the vacuum pump 9. The method is to open the two-way vacuum valve 6 after closing the vacuum pump 9 to allow the external atmosphere to enter the vacuum pump 9 through the side hole sampling needle 20 and the pipeline. After half a minute, the internal pressure of the vacuum pump 9 is consistent with the atmosphere, and then close the two-way vacuum valve 6 to prevent oil return in the pump tube, completing the entire vacuum pumping process.

[0070] (2) Dilution function realization: Positioning and advancing and retreating the needle are similar to the above, and the nitrogen pressure regulating valve 12 is adjusted, which is also the gas pressure during dilution. The three-way air inlet valve 7 is opened, and the three-way selector valve 8 is opened. The compressed nitrogen enters the sample bottle to dilute the gas in the bottle. The main principle of dilution is based on the ideal gas state equation (Clapeyron equation PV = nRT). After the dilution is completed, close the three-way air inlet valve 7 and the three-way selector valve 8.

[0071] (3) Implementation of the cleaning function: According to the above two functions, first vacuumize, then fill with nitrogen for dilution, repeat several times, and finally vacuumize again. Complete the cleaning of the sample bottles. After the cleaning of the entire batch of sample bottles is completed, after the program controls to close the vacuum pump 9, it is necessary to open the two-way vacuum valve 6 for half a minute and then close it in the same way as the vacuuming process to balance the pressure in the vacuum pump 6 and prevent oil from returning to the pump pipe.

[0072] (4) Sample preparation: Connect the sample gas bag to the gas sampling pump 10, first open the two-way vacuum valve 6 to extract the vacuum in the bottle, close the two-way vacuum valve 6, open the three-way selection valve 8, the gas in the sample gas bag is sucked into the evacuated sample bottle, then close the three-way selection valve 8, open the two-way vacuum valve 6, and evacuate the sample bottle again, which is equivalent to using the sample gas to clean the sample bottle once. The sample gas in the gas bag can be used to clean the sample bottle multiple times in a cycle. After the last cleaning, open the gas sampling pump 10, press the sample gas in the gas bag into the sample bottle for storage, then close the three-way selection valve 8 and the gas sampling pump 10, lift the needle, and complete the preparation of a single gas sample. And in Figure 1 If the gas bag is replaced with a standard gas cylinder, this function can be used to automatically prepare standard gas samples in batches. When the entire batch of samples is prepared, it is also necessary to turn off the vacuum pump 9, open the two-way vacuum valve 6 for half a minute and then close it to prevent oil from returning to the pump tube.

[0073] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0074] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multifunctional gas pre-treatment device, characterized in that: include: Positioning system, gas system, control system and base plate; The positioning system is electrically connected to the control system; The positioning system is fixed on the base plate; The gas circuit system includes: a cylinder, a cylinder driving device, an injection system, a two-way vacuum valve, a three-way air inlet valve, a three-way selection valve, a vacuum pump, an air sampling pump, a sample gas bag, and a nitrogen pressure-stabilizing valve; the air inlet of the vacuum pump is connected to the exhaust port of the three-way selection valve through the two-way vacuum valve; the sample gas bag is connected to the exhaust port of the three-way air inlet valve through the air sampling pump; the air inlet of the three-way air inlet valve is connected to the air outlet of the nitrogen pressure-stabilizing valve; the air outlet of the three-way air inlet valve is connected to the air inlet of the three-way selection valve; the air outlet of the three-way selection valve is connected to the injection system; the cylinder is fixed on the positioning system; and is connected to the cylinder control device; the injection system is connected to the cylinder; the cylinder driving device, the two-way vacuum valve, the three-way air inlet valve, the three-way selection valve, the vacuum pump, and the air sampling pump are electrically connected to the control system respectively; The cylinder control device comprises: a three-way needle inlet valve, a three-way needle return valve and an air pressure-stabilizing valve; the three-way needle inlet valve outlet and the three-way needle return valve outlet are respectively connected to the cylinder; the three-way needle inlet valve inlet and the three-way needle return valve inlet are connected to the air pressure-stabilizing valve outlet through a three-way joint; the air pressure-stabilizing valve inlet is connected to compressed air; the three-way needle inlet valve and the three-way needle return valve are electrically connected to the control system respectively; the cylinder comprises: a cylinder barrel, a piston, and a cylinder shaft; the piston divides the cylinder into an upper air chamber and a lower air chamber; the upper air chamber is connected to the three-way needle inlet valve outlet, and the lower air chamber is connected to the three-way needle return valve outlet; one end of the cylinder shaft is connected to the piston, and the other end is connected to the injection system; A needle position probe is installed on the top of the cylinder; a needle position magnet is installed on the piston; the needle position probe is electrically connected to the control system; the injection system includes: a needle seat and an injection needle, one end of the needle seat is connected to the cylinder shaft, and the other end is connected to the injection needle, and the inside of the needle seat is connected to the air outlet of the three-way selection valve; The positioning system comprises: a sample plate, a gear plate, a cylinder arm, a central axis device, a side axis device, a sliding arm, a gear and a power device; the sample plate and the gear plate are both fixedly mounted on the central axis device, and the sample plate is located above the gear plate; the sample plate is provided with bottle position holes distributed in an involute line; a slide groove corresponding to the bottle position hole is provided on the surface of the gear plate; the central axis device and the side axis device are both vertically mounted on the bottom plate; the sliding arm and one end of the cylinder arm are both mounted on the side axis device, and the sliding arm is parallel to the cylinder arm; a guide head is also fixedly mounted on the sliding arm, and the guide head slides in the slide groove; the cylinder is fixed on the cylinder arm; the gear is connected to the power device, and the gear is adapted to the gear plate; The slide arm comprises: an upper slide and a lower slide, the upper slide and the lower slide are fixedly mounted on the side axis device, the upper slide and the lower slide are PCB circuit boards with components welded thereon, and the guide head is arranged on the upper slide; the upper slide and the lower slide are electrically connected to the control system by conductive wires respectively; the starting position and the ending position of the slide slot are respectively provided with a starting magnet and a final magnet; the upper slide is provided with a starting probe and a final probe; the starting probe and the final probe are both electrically connected to the control device; The upper slide is welded with a capacitive grid displacement sensor, the head of the capacitive grid displacement sensor is located in the guide head, and a capacitive grid circuit is pasted inside the slide groove; the capacitive grid displacement sensor is powered by the upper slide; The central axis device comprises: a central axis bearing part and a central axis rod; the lower end of the central axis rod is fitted in the central axis bearing part; and the sample plate and the gear plate are both fixedly sleeved on the central axis rod; the side axis device comprises: a side axis bearing part and a side axis rod; the lower end of the side axis rod is fitted in the side axis bearing part; and the upper slide plate and the lower slide plate are both fixedly sleeved on the side axis rod; and the central axis bearing part and the side axis bearing part are both vertically mounted on the bottom plate; The central axis bearing component and the side axis bearing component are the same, both of which include: a bearing seat, a bearing and a shaft cylinder; the upper part of the bearing seat is open, cylindrical, hollow, and has an external thread interface at the bottom, which is screwed to the bottom plate through the external thread interface; the bottom of the bearing sleeve is connected to the bottom plate and there is an annular depression inside; there are two bearings, which are respectively located at the upper and lower ends of the bearing seat; the shaft cylinder is a hollow cylindrical shape, and its inner diameter is larger than the inner diameter of the bearing, and is located between the two bearings, and the two end surfaces of the shaft cylinder are in close contact with the inner ring end surfaces of the upper and lower bearings; the central axis rod and the side axis rod pass through the inner holes of the bearing and the shaft cylinder; The sample plate and the gear plate are mounted on the central shaft through a plate seat, and the plate seat includes: a locking hole at the center, screw holes at four corners, and a locking nail hole at one side, a locking hole notch is provided on one side of the locking hole, and a locking hole through groove is provided on the other side corresponding to the locking hole notch, and the locking nail hole is perpendicular to the locking hole through groove; screw holes that are consistent with the screw holes are provided on the gear plate and the sample plate; The sample plate comprises an upper plate, a middle plate, a lower plate, a single-pass copper column, a double-pass copper column and fixing screws; the middle plate is arranged between the upper plate and the lower plate, and is connected by the single-pass copper column, the double-pass copper column and the fixing screws; the upper plate and the middle plate have the same structure, a central axis hole is arranged at the center position, and bottle position holes arranged in an involute manner are arranged on the plate surface; except that the bottle position holes are not arranged on the lower plate, the other structures are the same as those of the upper plate.

2. The multifunctional gas pre-treatment device according to claim 1, characterized in that: The control system includes a control panel and a single-chip microcomputer. The control panel is connected to the single-chip microcomputer by wiring. The positioning system, two-way vacuum valve, three-way air intake valve, three-way selection valve, vacuum pump, air sampling pump, and cylinder drive device are respectively connected to the single-chip microcomputer by conductive wires and are controlled by the program in the single-chip microcomputer.

Images