Sample feeding device of atomic absorption spectrophotometer

Abstract

The utility model relates to the technical field of detection equipment, and discloses an atomic absorption spectrophotometer sample injection device which comprises a sample injection pipe fixed through a fixing structure; a plurality of sample bottle placing bases are arranged above the rotating disc in the circumferential direction at intervals, and the sample bottle placing bases are used for placing sample bottles; the rotary driving structure is used for driving the rotary disc to intermittently rotate around the axis of the rotary disc; the lifting driving device is used for driving the rotating disc to lift; when the rotating disc is driven by the rotating driving structure to rotate until one of the sample bottles is located under the pipe opening of the sample injection pipe, the rotating disc stops rotating, and the lifting driving device drives the rotating disc to ascend, so that the sample injection pipe is inserted into the sample bottle. In the detection process, the sample bottle does not need to be held by hands, the sample injection pipe does not need to be held by hands, time and labor are saved, cross infection can be avoided, and automatic operation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a sample injection device for an atomic absorption spectrophotometer. Background Art

[0002] Laboratories often use atomic absorption spectrophotometers (flame part) to detect elemental projects. During operation, the sampling hose is inserted into the sample bottle for sample suction detection. At this time, the sampling tube must be held in one hand and the sample bottle must be held in the other hand. After the sampling tube is inserted into the solution in the sample bottle, the detection button of the instrument is pressed to suction the sample. The sample bottle needs to be held by hand all the time, which is inconvenient to operate. In addition, the sampling tube is in contact with the hand, and there is a possibility of cross contamination. Utility Model Content

[0003] In view of this, the utility model provides a sample injection device for an atomic absorption spectrophotometer to solve the problem that a sample bottle and a sample injection tube need to be held by hand during sample suction detection.

[0004] The utility model provides a sample injection device for an atomic absorption spectrophotometer, comprising:

[0005] The sample injection tube is fixed by a fixing structure;

[0006] A rotating disk, wherein a plurality of sample bottle placement bases are provided above the rotating disk at intervals along the circumferential direction, and the sample bottle placement bases are used to place sample bottles;

[0007] A rotation driving structure, used for driving the rotating disk to intermittently rotate around its axis;

[0008] A lifting drive device, used for driving the rotating disk to lift;

[0009] When the rotating disk is driven by the rotating drive structure to rotate until one of the sample bottles is located directly below the tube opening of the injection tube, the rotating disk stops rotating and the lifting drive device drives the rotating disk to rise, so that the injection tube is inserted into the sample bottle.

[0010] The sample bottle is placed on the sample bottle placing base, and the sample bottle placing base can limit and fix the sample bottle. The sampling tube is fixed by the fixing structure, and the position of the sampling tube is not easy to shake. When the rotating disk is driven by the rotating drive structure to rotate until one of the sample bottles is located directly under the tube mouth of the sampling tube, the rotating disk stops rotating and the lifting drive device drives the rotating disk to rise, so that the sampling tube is inserted into the sample bottle for sample suction detection. During the sample suction detection process, the rotating disk remains stationary in the vertical direction. After the sample suction detection is completed, the lifting drive device drives the rotating disk to descend, and the rotating drive structure continues to drive the rotating disk to rotate until the sample bottle on the next sample bottle placing base is located directly under the tube mouth of the sampling tube, and the above process is repeated to complete the sample suction detection of the sample bottle on the next sample bottle placing base. According to this process, the sample suction detection can be carried out on multiple sample bottles on the sample bottle placing base in turn. During the detection process, there is no need to hold the sample bottle or the sampling tube, which saves time and effort, can avoid cross infection, and realizes automated operation.

[0011] In an optional embodiment, the rotation drive structure includes:

[0012] Rotating electrical machines;

[0013] An incomplete gear fixedly connected to the output shaft of the rotating motor;

[0014] A rotating gear is coaxial with the rotating disk and fixed below the rotating disk. The rotating gear can mesh with the incomplete gear. The incomplete gear meshes with the rotating gear from the beginning to the end. The rotating disk rotates from one sample bottle placement base being located directly below the tube mouth of the injection tube to the next sample bottle placement base being located directly below the tube mouth of the injection tube.

[0015] Beneficial effect: the rotating motor can drive the incomplete gear to rotate continuously. When the incomplete gear starts to mesh with the rotating gear, the incomplete gear can drive the rotating gear to rotate. During the rotation of the rotating gear, the position of the sample bottle placement base above the rotating disk is driven to change. When the incomplete gear ends meshing with the rotating gear, the sample bottle placement base just rotates to below the tube mouth of the sampling tube. Then the lifting drive device drives the rotating disk to rise so that the sampling tube is inserted into the sample bottle for sample suction detection. During the sample suction detection process, the incomplete gear disengages from the rotating gear and the rotating disk stops rotating. Therefore, the rotating motor can keep working all the time, which is easy to control.

[0016] In an optional embodiment, the incomplete gear is a quarter gear.

[0017] In an optional embodiment, the atomic absorption spectrophotometer sample injection device includes a base, the rotary motor is fixed to the base, and the atomic absorption spectrophotometer sample injection device further includes:

[0018] A column fixed to the base;

[0019] The first rod is sleeved outside the column, the top end of the first rod is against the lower surface of the rotating disk or the rotating gear, and the lifting drive device is used to drive the first rod to move up and down.

[0020] Beneficial effect: By arranging a column on the base, the first set of rods is sleeved outside the column, and the column can guide and limit the lifting and lowering of the first set of rods. Since the top end of the first set of rods is against the lower surface of the rotating disk or the rotating gear, the first set of rods can drive the rotating disk to rise and fall during the lifting process. At the same time, the rotating disk can rotate relative to the first set of rods, and the first set of rods will not interfere with the rotation of the rotating disk.

[0021] In an optional embodiment, the atomic absorption spectrophotometer sample injection device further comprises:

[0022] The top end of the second rod is fixedly connected to the lower surface of the rotating disk or the rotating gear, and the second rod is arranged on the inner side of the column.

[0023] Beneficial effect: By setting up a second set of rods, the top end of the second set of rods is fixedly connected to the lower surface of the rotating disk or the rotating gear, and the second set of rods is arranged on the inner side of the column. When the first set of rods drives the rotating disk to rise and fall, the second set of rods is lifted and lowered relative to the column on the inner side of the column, and the first set of rods is lifted and lowered relative to the column on the outer side of the column, so that the overall structure is more stable.

[0024] In an optional embodiment, the lifting drive device includes:

[0025] The rotating structure comprises a first part and a second part, wherein the first part comprises an arc-shaped first connecting part, the radii of the first connecting parts are equal, and the second part comprises an arc-shaped second connecting part, wherein the second connecting part comprises a first end and a second end respectively connected to the ends of the first connecting part, and from the first end to the second end, the distance between the second connecting part and the center of the circle of the first connecting part first gradually decreases and then gradually increases;

[0026] A lifting motor connected to the center of the first connecting portion and used to drive the rotating structure to rotate;

[0027] The clamping shaft has one end connected to the first sleeve rod and the other end arranged in the first connecting part or the second connecting part, and can slide along the first connecting part and the second connecting part.

[0028] Beneficial effect: Since the radius of the first connection part is equal, when the lifting motor drives the rotating structure to rotate, during the process of the card shaft sliding along the first connection part, the distance between the card shaft and the center of the circle of the first connection part remains unchanged, and the position of the rotating disk in the vertical direction remains unchanged. When the rotating structure rotates to the first end of the card shaft located at the second connection part, the rotating structure continues to rotate, and the distance between the card shaft and the center of the circle of the first connection part gradually decreases, so the card shaft will drive the first set of rods to descend, and then drive the rotating disk to descend. When the card shaft is located at the lowest point of the second connection part, the rotating disk descends to the lowest position. During the process of the card shaft sliding from its lowest point to its second end relative to the second connection part, the distance between the card shaft and the center of the circle of the first connection part gradually increases, and the card shaft will drive the first set of rods to rise, and then drive the rotating disk to rise. The lifting drive device is cleverly designed, which can make the lifting motor meet the requirements of both the rising and falling processes of the rotating disk and the process of keeping still under the premise of keeping working, and is more suitable for the process of sample suction detection.

[0029] In an optional embodiment, the rotating structure is an axisymmetric structure, the rotation speed of the lifting motor is the same as the rotation speed of the rotating motor, when the clamping shaft moves from the first connecting part to the first end, the incomplete gear starts to mesh with the rotating gear, and when the clamping shaft moves to the midpoint of the second part, the incomplete gear ends meshing with the rotating gear.

[0030] Beneficial effect: Since the rotation speed of the lifting motor is the same as that of the rotating motor, the lifting motor and the rotating motor can rotate synchronously, which is easier to control. When the sample suction test is completed, the card shaft is located in the first end, the incomplete gear and the rotating gear begin to mesh, and the lifting motor and the rotating motor are both working. The lifting motor drives the rotating structure to rotate, so that the card shaft gradually moves from the first end to the midpoint of the second part, that is, the lowest point of the second part. The distance between the card shaft and the center of the circle of the first connecting part gradually decreases. The card shaft will drive the first set of rods to descend, and then drive the rotating disk to descend. When the card shaft is located at the lowest point of the second connecting part, the rotating disk descends to the lowest position. At the same time, the rotating gear rotates under the meshing action of the incomplete gear. When the rotating disk descends to the lowest position, the base for placing the next sample bottle is located directly below the nozzle of the injection tube. After that, the rotating gear and The incomplete gear disengages, the rotating gear continues to work, the rotating disk does not rotate, and in the process of the card shaft sliding from the midpoint of the second part to the second end, the distance between the card shaft and the center of the circle of the first connecting part gradually increases, the card shaft will drive the first set of rods to rise, and then drive the rotating disk to rise, so that the sampling tube is inserted into the sample bottle. When the card shaft is located at the second end, the rotating disk rises to the highest point, and then the sample suction test begins. During the sample suction test, the card shaft slides along the first connecting part, and the distance between the card shaft and the center of the circle of the first connecting part remains unchanged, and the position of the rotating disk in the vertical direction remains unchanged. When the sample suction test is completed, the card shaft returns to the first end, and the above process is repeated to complete the sample suction test on multiple sample bottles.

[0031] In an optional embodiment, the base is provided with a motor seat, and the lifting motor is fixed to the motor seat.

[0032] Beneficial effect: The setting of the motor seat not only facilitates the installation and fixation of the lifting motor, but also can increase the height of the lifting motor.

[0033] In an optional embodiment, the atomic absorption spectrophotometer sample injection device also includes a shell, which is connected to the edge of the base and surrounds the lifting motor, the rotating motor, the incomplete gear, the column, and at least a portion of the first set of rods.

[0034] Beneficial effect: The setting of the outer shell can prevent the user from touching the various internal structural components.

[0035] In an optional embodiment, the fixing structure includes a metal wire, and the metal wire is wound around the outside of the injection tube to make the injection tube have a predetermined shape.

[0036] Beneficial effect: The metal wire is wound around the outside of the sample injection tube, so that the sample injection tube can maintain a predetermined shape, so that during the sample suction detection process, there is no need to hold the sample injection tube by hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is a schematic structural diagram of a sample injection device for an atomic absorption spectrophotometer according to an embodiment of the utility model when a sample injection tube is inserted into a sample bottle;

[0039] Figure 2 This is a schematic structural diagram of a sample injection device for an atomic absorption spectrophotometer according to an embodiment of the utility model;

[0040] Figure 3 A cross-sectional view of a sample injection device for an atomic absorption spectrophotometer according to an embodiment of the utility model;

[0041] Figure 4 for Figure 2 A schematic diagram of the structure on the upper side of the middle rotating disk;

[0042] Figure 5 for Figure 2 Schematic diagram of the structure after the middle rotating disk is flipped;

[0043] Figure 6 for Figure 2 A schematic diagram of a structure in which a rotating motor is connected to an incomplete gear;

[0044] Figure 7 for Figure 2 A schematic diagram of the structure after the middle lifting drive structure is assembled with the column, the first set of rods, the motor seat and the base;

[0045] Figure 8 for Figure 2 A schematic diagram of the structure after the middle lifting drive structure is assembled with the first set of rods and the motor base;

[0046] Fig. 9 for Figure 2 Structural schematic diagram of the rotating structure;

[0047] Fig.10 is a cross-sectional schematic diagram of the chute;

[0048] Fig.11 It is a cross-sectional schematic diagram when the clamping portion of the clamping shaft is clamped into the sliding groove;

[0049] Fig.12 for Figure 2 A schematic diagram of the structure when the center column, the first set of rods and the second set of rods are assembled together;

[0050] Fig.13 for Figure 2 A schematic diagram of the structure when the center column, the first set of rods and the second set of rods are not assembled together;

[0051] Fig.14 for Figure 1 Schematic diagram of the structure of the sample injection tube.

[0052] Description of reference numerals:

[0053] 1. Injection tube; 2. Metal wire; 3. Rotating disk; 4. Sample bottle placement base; 5. Sample bottle; 6. Rotating motor; 7. Incomplete gear; 8. Rotating gear; 9. Base; 10. Column; 11. First set of rods; 12. Second set of rods; 13. Rotating structure; 1301. First part; 13011. First connecting part; 130111. Arc section; 130112. First section; 130113. Second section; 1302. Second part; 13021. Second connecting part; 13022. First end; 13023. Midpoint; 13024. Second end; 14. Lifting motor; 15. Clamping shaft; 1501. Clamping part; 16. Motor seat; 17. Casing. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0055] Laboratories often use atomic absorption spectrophotometers (flame part) to detect elemental items. During operation, the sampling hose is inserted into the sample bottle 5 for sample suction detection. At this time, the sampling tube 1 must be held in one hand and the sample bottle 5 must be held in the other hand. After the sampling tube 1 is inserted into the solution in the sample bottle 5, the detection button of the instrument is pressed to suction the sample. The sample bottle 5 needs to be held by hand all the time, which is inconvenient to operate. In addition, the sampling tube 1 contacts the hand, and there is a possibility of cross contamination.

[0056] Combine the following Figures 1 to 14 , describing an embodiment of the utility model.

[0057] According to an embodiment of the utility model, a sample injection device for an atomic absorption spectrophotometer is provided, comprising an injection tube 1, a rotating disk 3, a rotation drive structure and a lifting drive device.

[0058] The sample injection tube 1 is fixed by a fixing structure; a plurality of sample bottle placing bases 4 are arranged at intervals along the circumferential direction above the rotating disk 3, and the sample bottle placing bases 4 are used to place sample bottles 5; the rotating drive structure is used to drive the rotating disk 3 to rotate intermittently around its axis; and the lifting drive device is used to drive the rotating disk 3 to rise and fall. When the rotating disk 3 is driven by the rotating drive structure to rotate until one of the sample bottles 5 is located directly below the tube mouth of the sample injection tube 1, the rotating disk 3 stops rotating and the lifting drive device drives the rotating disk 3 to rise, so that the sample injection tube 1 is inserted into the sample bottle 5.

[0059] In this embodiment, when testing, the sample bottle 5 is placed on the sample bottle placement base 4, and the sample bottle placement base 4 can limit and fix the sample bottle 5. The injection tube 1 is fixed by a fixing structure, and the position of the injection tube 1 is not easy to shake. When the rotating disk 3 is driven by the rotating drive structure to rotate until one of the sample bottles 5 is located directly below the nozzle of the injection tube 1, the rotating disk 3 stops rotating and the lifting drive device drives the rotating disk 3 to rise, so that the injection tube 1 is inserted into the sample bottle 5 for sample suction detection. During the sample suction detection process, the rotating disk 3 remains stationary in the vertical direction. After the sample suction detection is completed, the lifting drive device drives the rotating disk 3 to descend, and the rotating drive structure continues to drive the rotating disk 3 to rotate until the sample bottle 5 on the next sample bottle placement base 4 is located directly below the nozzle of the injection tube 1, and the above process is repeated to complete the sample suction detection of the sample bottle 5 on the next sample bottle placement base 4. According to this process, the sample suction detection can be performed on multiple sample bottles 5 on the sample bottle placement base 4 in turn. During the detection process, there is no need to hold the sample bottle 5 or the injection tube 1, which saves time and effort, avoids cross infection, and realizes automated operation.

[0060] Specifically in one embodiment, one end of the sample injection tube 1 away from the tube opening is connected to the detection instrument.

[0061] Specifically in one embodiment, the sample bottle placement base 4 is provided with a placement groove adapted to the sample bottle 5 .

[0062] In one embodiment, the rotary drive structure includes a rotary motor 6, an incomplete gear 7 and a rotary gear 8. The incomplete gear 7 is fixedly connected to the output shaft of the rotary motor 6; the rotary gear 8 is coaxial with the rotary disk 3 and fixed below the rotary disk 3, and the rotary gear 8 can mesh with the incomplete gear 7. The incomplete gear 7 meshes with the rotary gear 8 from the beginning to the end, and the rotary disk 3 rotates from one of the sample bottle placement bases 4 being located directly below the tube mouth of the injection tube 1 to the next sample bottle placement base 4 being located directly below the tube mouth of the injection tube 1.

[0063] In this embodiment, the rotating motor 6 can drive the incomplete gear 7 to rotate continuously. When the incomplete gear 7 starts to mesh with the rotating gear 8, the incomplete gear 7 can drive the rotating gear 8 to rotate. During the rotation of the rotating gear 8, the position of the sample bottle placement base 4 above the rotating disk 3 is driven to change. When the incomplete gear 7 ends the meshing with the rotating gear 8, the sample bottle placement base 4 just rotates to below the tube mouth of the sample injection tube 1, and then the lifting drive device drives the rotating disk 3 to rise, so that the sample injection tube 1 is inserted into the sample bottle 5 for sample suction detection. During the sample suction detection process, the incomplete gear 7 is disengaged from the rotating gear 8, and the rotating disk 3 stops rotating, so that the rotating motor 6 can keep working all the time, which is easy to control.

[0064] In one embodiment, the incomplete gear 7 is a quarter gear.

[0065] In one embodiment, the atomic absorption spectrophotometer sample injection device includes a base 9, the rotating motor 6 is fixed to the base 9, and the atomic absorption spectrophotometer sample injection device also includes a column 10 and a first set of rods 11. The column 10 is fixed to the base 9; the first set of rods 11 is sleeved outside the column 10, the top of the first set of rods 11 is against the lower surface of the rotating disk 3 or the rotating gear 8, and the lifting drive device is used to drive the first set of rods 11 to move up and down.

[0066] In this embodiment, a column 10 is provided on the base 9, and a first set of rods 11 is sleeved outside the column 10. The column 10 can guide and limit the lifting and lowering of the first set of rods 11. Since the top end of the first set of rods 11 is against the lower surface of the rotating disk 3 or the rotating gear 8, the first set of rods 11 can drive the rotating disk 3 to rise and fall during the lifting process. At the same time, the rotating disk 3 can rotate relative to the first set of rods 11, and the first set of rods 11 will not interfere with the rotation of the rotating disk 3.

[0067] It should be noted that the top end of the first set of rods 11 can directly abut against the lower surface of the rotating gear 8 , or pass through the center of the rotating gear 8 to abut against the lower surface of the rotating disk 3 .

[0068] In one embodiment, the atomic absorption spectrophotometer sample injection device further includes a second rod 12 , the top end of which is fixedly connected to the lower surface of the rotating disk 3 or the rotating gear 8 , and the second rod 12 is disposed inside the column 10 .

[0069] In this embodiment, a second set of rods 12 is provided, the top end of the second set of rods 12 is fixedly connected to the lower surface of the rotating disk 3 or the rotating gear 8, and the second set of rods 12 is provided on the inner side of the column 10. When the first set of rods 11 drives the rotating disk 3 to rise and fall, the second set of rods 12 is lifted and lowered on the inner side of the column 10 relative to the column 10, and the first set of rods 11 is lifted and lowered on the outer side of the column 10 relative to the column 10, so that the overall structure is more stable.

[0070] It should be noted that the top end of the second set of rods 12 can be directly fixedly connected to the lower surface of the rotating gear 8 , or pass through the center of the rotating gear 8 and be fixedly connected to the lower surface of the rotating disk 3 .

[0071] In one embodiment, the lifting drive device includes a rotating structure 13 , a lifting motor 14 and a clamping shaft 15 .

[0072] The rotating structure 13 includes a first part 1301 and a second part 1302, the first part 1301 has an arc-shaped first connecting part 13011, and the radius of the first connecting part 13011 is equal. The second part 1302 includes an arc-shaped second connecting part 13021, and the second connecting part 13021 has a first end 13022 and a second end 13024 respectively connected to the ends of the first connecting part 13011. From the first end 13022 to the second end 13024, the distance between the second connecting part 13021 and the center of the first connecting part 13011 gradually decreases and then gradually increases; the lifting motor 14 is connected to the center of the first connecting part 13011, and is used to drive the rotating structure 13 to rotate; one end of the clamping shaft 15 is connected to the first sleeve rod 11, and the other end is arranged in the first connecting part 13011 or the second connecting part 13021, and can slide along the first connecting part 13011 and the second connecting part 13021.

[0073] In this embodiment, since the radius of the first connection part 13011 is equal, when the lifting motor 14 drives the rotating structure 13 to rotate, during the sliding process of the clamping shaft 15 along the first connection part 13011, the distance between the clamping shaft 15 and the center of the circle of the first connection part 13011 remains unchanged, and the position of the rotating disk 3 in the vertical direction remains unchanged. When the rotating structure 13 rotates until the clamping shaft 15 is located at the first end 13022 of the second connection part 13021, the rotating structure 13 continues to rotate, and the clamping shaft 15 and the first connection part 130 11 first gradually decreases, so the card shaft 15 will drive the first set of rods 11 to descend, and then drive the rotating disk 3 to descend. When the card shaft 15 is located at the lowest point of the second connecting part 13021, the rotating disk 3 descends to the lowest position. In the process of the card shaft 15 sliding from its lowest point to its second end 13024 relative to the second connecting part 13021, the distance between the card shaft 15 and the center of the circle of the first connecting part 13011 gradually increases, and the card shaft 15 will drive the first set of rods 11 to rise, and then drive the rotating disk 3 to rise. The lifting drive device is cleverly designed, and the lifting motor 14 can satisfy the rotating disk 3 to have both the rising process and the falling process, and the process of keeping still, while keeping working, which is more suitable for the process of suction sample detection.

[0074] Specifically in one embodiment, Fig. 9 As shown, the first part 1301 is a semicircular sheet structure, and the second part 1302 is half of an elliptical structure.

[0075] Specifically in one embodiment, the first connection portion 13011 and the second connection portion 13021 are both slide grooves. Fig.10 and Fig.11As shown, the cross-section of the slide groove includes an arc segment 130111, two first segments 130112 connected to the lower end of the arc segment 130111, the lower ends of the two first segments 130112 are respectively bent inward to form a second segment 130113, the second segment 130113 is perpendicular to the first segment 130112, and there is a gap between the two second segments 130113, the card shaft 15 passes through the gap, and the outer diameter of the card joint of the card shaft 15 is larger than the width of the gap, and the card shaft 15 can slide along the gap.

[0076] In an embodiment not shown in the figure, the lifting drive device may include a cylinder, and the push rod end of the cylinder is connected to the first set of rods 11. In this embodiment, when the rotating disk 3 is driven by the rotating drive structure to rotate until one of the sample bottles 5 is located directly below the tube mouth of the sampling tube 1, the cylinder drives the first set of rods 11 to drive the rotating disk 3 to rise. During the sample suction test, the cylinder remains stationary. After the sample suction test is completed, the cylinder drives the first set of rods 11 to descend.

[0077] In another embodiment not shown in the figures, the lifting drive device may include a push rod motor.

[0078] In another embodiment not shown in the figures, the lifting drive device may include a motor and a ball screw, and the nut of the ball screw is connected to the first set of rods 11.

[0079] In one embodiment, the rotating structure 13 is an axially symmetrical structure, the rotation speed of the lifting motor 14 is the same as the rotation speed of the rotating motor 6, and when the clamping shaft 15 moves from the first connecting part 13011 to the first end 13022, the incomplete gear 7 starts to mesh with the rotating gear 8, and when the clamping shaft 15 moves to the midpoint 13023 of the second part 1302, the incomplete gear 7 ends meshing with the rotating gear 8.

[0080] In this embodiment, since the rotation speed of the lifting motor 14 is the same as that of the rotating motor 6, the lifting motor 14 and the rotating motor 6 can be rotated synchronously, which is easier to control. When the sample suction test is completed, the card shaft 15 is located in the first end 13022, the incomplete gear 7 and the rotating gear 8 begin to mesh, the lifting motor 14 and the rotating motor 6 are both working, the lifting motor 14 drives the rotating structure 13 to rotate, so that the card shaft 15 gradually moves from the first end 13022 to the midpoint 13023 of the second part 1302, that is, the lowest point of the second part 1302, the distance between the card shaft 15 and the center of the circle of the first connecting part 13011 gradually decreases, the card shaft 15 will drive the first set of rods 11 to descend, and then drive the rotating disk 3 to descend, when the card shaft 15 is located at the lowest point of the second connecting part 13021, the rotating disk 3 descends to the lowest position, at the same time, the rotating gear 8 rotates under the meshing action of the incomplete gear 7, when the rotating disk 3 descends to the lowest position, the next sample bottle placement base 4 is located directly below the tube mouth of the injection tube 1, and then the rotating gear 8 and the incomplete gear 7 are engaged. The complete gear 7 is disengaged, the rotating gear 8 continues to work, and the rotating disk 3 does not rotate. During the process of the card shaft 15 sliding from the midpoint 13023 of the second part 1302 to the second end 13024, the distance between the card shaft 15 and the center of the first connecting part 13011 gradually increases, and the card shaft 15 will drive the first set of rods 11 to rise, and then drive the rotating disk 3 to rise, so that the sampling tube 1 is inserted into the sample bottle 5. When the card shaft 15 is located at the second end 13024, the rotating disk 3 rises to the highest point, and then starts the sample suction detection. During the sample suction detection, the card shaft 15 slides along the first connecting part 13011, and the distance between the card shaft 15 and the center of the first connecting part 13011 remains unchanged, and the position of the rotating disk 3 in the vertical direction remains unchanged. When the sample suction detection is completed, the card shaft 15 returns to the first end 13022, and the above process is repeated to complete the sample suction detection of multiple sample bottles 5.

[0081] Specifically, the time for sample suction detection is 30s, the ascending process and the descending process are 15s respectively, and the time of the descending process is consistent with the time from the beginning of engagement to the end of engagement of the incomplete gear 7 with the rotating gear 8. Therefore, the rotating motor 6 rotates 1 circle per minute, and the lifting motor 14 also rotates 1 circle per minute.

[0082] It should be noted that, since the sample injection tube 1 has a certain flexibility, it can ensure that the rotating disk 3 descends and rotates synchronously.

[0083] Specifically in one embodiment, Figure 1 , Figure 2 , Figure 4 The rotating disk 3 is provided with four sample bottle placing bases 4 in total.

[0084] In one embodiment, the base 9 is provided with a motor seat 16 , and the lifting motor 14 is fixed to the motor seat 16 .

[0085] In this embodiment, the motor seat 16 is provided to facilitate installation and fixation of the lifting motor 14 on the one hand, and to increase the height of the lifting motor 14 on the other hand.

[0086] In one embodiment, the fixing structure includes a metal wire 2, which is wound around the outside of the injection tube 1 to make the injection tube 1 present a predetermined shape.

[0087] In this embodiment, the metal wire 2 is wound around the outside of the sample injection tube 1, so that the sample injection tube 1 can maintain a predetermined shape, so that during the sample suction detection process, there is no need to hold the sample injection tube 1 by hand.

[0088] Specifically in one embodiment, Fig.14 As shown, the sample injection tube 1 is L-shaped, including a horizontal portion and a vertical portion.

[0089] Specifically in one embodiment, the metal wire 2 is a stainless steel wire.

[0090] In one embodiment, the atomic absorption spectrophotometer sample injection device further includes a housing 17 , which is connected to the edge of the base 9 and surrounds the lifting motor 14 , the rotating motor 6 , the incomplete gear 7 , the column 10 , and at least a portion of the first set of rods 11 .

[0091] In this embodiment, the setting of the housing 17 can prevent the user from touching the various internal structural components.

[0092] Specifically, the motor base 16 is surrounded by the housing 17 .

[0093] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A sample injection device for an atomic absorption spectrophotometer, characterized in that: include: The sample injection tube (1) is fixed by a fixing structure; A rotating disk (3), wherein a plurality of sample bottle placement bases (4) are arranged at intervals along the circumferential direction above the rotating disk (3), and the sample bottle placement bases (4) are used to place sample bottles (5); A rotation driving structure, used for driving the rotating disk (3) to rotate intermittently around its axis; A lifting drive device, used for driving the rotating disk (3) to lift and lower; When the rotating disk (3) is driven by the rotating drive structure to rotate until one of the sample bottles (5) is located directly below the tube mouth of the injection tube (1), the rotating disk (3) stops rotating and the lifting drive device drives the rotating disk (3) to rise, so that the injection tube (1) is inserted into the sample bottle (5).

2. The atomic absorption spectrophotometer sample injection device according to claim 1, characterized in that: The rotary drive structure comprises: Rotating electric machine (6); An incomplete gear (7) fixedly connected to the output shaft of the rotating motor (6); A rotating gear (8) is coaxial with the rotating disk (3) and fixed below the rotating disk (3). The rotating gear (8) can mesh with the incomplete gear (7). The incomplete gear (7) meshes with the rotating gear (8) from the beginning to the end. The rotating disk (3) rotates from one sample bottle placement base (4) being located directly below the tube mouth of the injection tube (1) to the next sample bottle placement base (4) being located directly below the tube mouth of the injection tube (1).

3. The atomic absorption spectrophotometer sample injection device according to claim 2, characterized in that: The incomplete gear (7) is a quarter gear.

4. The atomic absorption spectrophotometer sample injection device according to claim 2, characterized in that: The atomic absorption spectrophotometer sample injection device comprises a base (9), the rotary motor (6) is fixed to the base (9), and the atomic absorption spectrophotometer sample injection device further comprises: A column (10) fixed to the base (9); A first sleeve rod (11) is sleeved outside the column (10), the top end of the first sleeve rod (11) abuts against the lower surface of the rotating disk (3) or the rotating gear (8), and the lifting drive device is used to drive the first sleeve rod (11) to move up and down.

5. The atomic absorption spectrophotometer sample injection device according to claim 4, characterized in that: The atomic absorption spectrophotometer sample injection device also includes: The second rod (12) has a top end fixedly connected to the lower surface of the rotating disk (3) or the rotating gear (8), and the second rod (12) is arranged on the inner side of the column (10).

6. The atomic absorption spectrophotometer sample injection device according to claim 4, characterized in that: The lifting drive device comprises: A rotating structure (13) comprises a first part (1301) and a second part (1302), wherein the first part (1301) comprises an arcuate first connecting part (13011), the radius of the first connecting part (13011) is equal, and the second part (1302) comprises an arcuate second connecting part (13021), wherein the second connecting part (13021) comprises a first end (13022) and a second end (13024) respectively connected to the ends of the first connecting part (13011), and from the first end (13022) to the second end (13024), the distance between the center of the second connecting part (13021) and the first connecting part (13011) first gradually decreases and then gradually increases; A lifting motor (14), connected to the center of the first connecting portion (13011), and used for driving the rotating structure (13) to rotate; The clamping shaft (15) has one end connected to the first sleeve rod (11) and the other end disposed in the first connecting portion (13011) or the second connecting portion (13021), and is capable of sliding along the first connecting portion (13011) and the second connecting portion (13021).

7. The atomic absorption spectrophotometer sample injection device according to claim 6, characterized in that: The rotating structure (13) is an axisymmetric structure. The rotation speed of the lifting motor (14) is the same as the rotation speed of the rotating motor (6). When the clamping shaft (15) moves from the first connecting part (13011) to the first end (13022), the incomplete gear (7) and the rotating gear (8) begin to mesh. When the clamping shaft (15) moves to the midpoint (13023) of the second part (1302), the incomplete gear (7) and the rotating gear (8) stop meshing.

8. The atomic absorption spectrophotometer sample injection device according to claim 6, characterized in that: The base (9) is provided with a motor seat (16), and the lifting motor (14) is fixed to the motor seat (16).

9. The atomic absorption spectrophotometer sample injection device according to any one of claims 6 to 8, characterized in that: The atomic absorption spectrophotometer sample injection device also includes a housing (17), which is connected to the edge of the base (9) and surrounds the lifting motor (14), the rotating motor (6), the incomplete gear (7), the column (10), and at least a portion of the first set of rods (11).

10. The atomic absorption spectrophotometer sample injection device according to any one of claims 1 to 8, characterized in that: The fixing structure comprises a metal wire (2), wherein the metal wire (2) is wound around the outside of the sample injection tube (1) so that the sample injection tube (1) is in a predetermined shape.

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