A digestion tube cap removal and acid spraying device

Abstract

This application relates to the technical field of acid spraying devices for digestion tubes, and more particularly to a digestion tube cap removal and acid spraying device. Its technical solution includes a Y-axis transfer assembly, a Z-axis cap removal and closing assembly, a digestion tube rotation assembly, an acid spraying assembly, and an extraction device. The transfer assembly moves the digestion tube between the cap removal station and the acid spraying station; the cap removal and closing assembly automatically removes and closes the cap; the end of the liquid addition tube of the acid spraying assembly is angled to the digestion tube, and works with the rotation assembly to drive the digestion tube to rotate at a uniform speed, allowing the acid to evenly rinse the residue on the inner wall of the tube; the extraction device removes acid mist below the tube opening. This invention achieves full automation of the pre-acid treatment, effectively removes adhering substances from the inner wall of the tube to ensure detection accuracy, and reduces the acid mist corrosion range to a minimal area, protecting equipment and personnel safety.

Description

Technical Field

[0001] This invention relates to the technical field of acid spraying devices for digestion tubes, and more particularly to an acid spraying device for removing the cap from a digestion tube. Background Technology

[0002] When performing microwave digestion pretreatment on target substances such as metallic elements, organic matter, and inorganic salts, strong acids such as nitric acid, hydrochloric acid, or hydrofluoric acid are added to the digestion tube containing the target substance. This causes the target substance to be digested down to the atomic layer under high temperature and pressure. After processes such as volume adjustment and dilution, the elemental content is finally accurately detected using a mass spectrometer. Currently, this acid addition operation is mostly performed manually in a fume hood. Operators must remove the tube caps one by one, add a measured amount of acid, and then replace the caps.

[0003] However, during the acid addition process, the acid reacts violently with the target substance, evaporating and producing a large amount of acid mist. Even when operating in a fume hood, the escaping acid mist can still corrode the precision parts of the equipment and seriously endanger the health of the operators. When the target substance is weighed into the tube, it is easy to adhere to the inner wall of the digestion tube. If only the vertical acid addition method is used, the acid solution is difficult to effectively flush the upper part of the tube wall, resulting in the residual target substance not being able to fully contact and react with the acid, ultimately affecting the accuracy and reliability of mass spectrometry analysis in detecting the content of target elements. Summary of the Invention

[0004] The purpose of this application is to address the problems existing in the background art by proposing a digestion tube cap removal and acid spraying device that prevents substances from adhering to the wall of the digestion tube and prevents acid mist from being discharged.

[0005] The technical solution of this application: a digestion tube cap removal and acid spraying device, comprising a modular upright plate and a base plate fixedly installed below the upright plate, and further comprising:

[0006] Digestion tube carrier box for accommodating digestion tubes;

[0007] Digester tube rotation assembly for driving the digester tube rotation;

[0008] The Z-axis cap removal and closing assembly is used for removing and closing the cap of the digestion tube.

[0009] An acid-adding spray assembly includes at least one set of liquid-adding pipes and a protective cover that is sealed and connected to the digestion tube carrier box. The end of the liquid-adding pipe is provided with a bent pipe, which is set at an angle of 30°-45° with the center line of the digestion tube.

[0010] An air extraction device for extracting acid mist during acid spraying, wherein the air extraction outlet of the air extraction device is connected to the digestion tube carrier box and is located below the digestion tube opening;

[0011] The Y-axis transfer assembly is used to transfer the digestion tube between the Z-axis cap removal assembly and the acid spraying assembly.

[0012] Optionally, the Y-axis transfer assembly includes a linear guide support fixedly mounted on the base plate, a Y-axis linear guide fixedly mounted on the linear guide support, and a Y-axis lead screw motor fixedly mounted on the module upright plate. The Y-axis lead screw motor includes a lead screw, a lead screw bearing seat is mounted on the linear guide support, and a lead screw support bearing that cooperates with the Y-axis lead screw motor is mounted on the lead screw bearing seat.

[0013] Optionally, the digestion tube carrier box includes a slider adapter plate slidably mounted on the Y-axis linear guide rail, a digestion tube lower seat fixedly mounted on the slider adapter plate, and a liquid receiving plate fixedly mounted on the digestion tube lower seat. A bearing seat is installed inside the digestion tube lower seat, a first deep groove ball bearing is fixedly mounted inside the bearing seat, and a first digestion tube rotating seat for supporting the digestion tube is installed inside the deep groove ball bearing. The slider adapter plate is threadedly connected to the Y-axis lead screw motor.

[0014] Optionally, a rotating guide block is installed inside the digestion tube lower seat. The rotating guide block is connected to the digestion tube lower seat through a rotating guide block pressure plate. A photoelectric switch fixing seat is fixedly installed on one side of the digestion tube lower seat, and a photoelectric switch is fixedly installed on the photoelectric switch fixing seat.

[0015] Optionally, the digestion tube rotating assembly includes a motor fixedly mounted on a base plate and a first magnetic gear rotatably mounted on the base plate. A bearing support is fixedly mounted on the base plate, a second deep groove ball bearing is mounted on the bearing support, and a gear connecting shaft is mounted on the deep groove ball bearing. One end of the gear connecting shaft is coaxially and fixedly connected to the first magnetic gear, and the other end is coaxially and fixedly connected to the output shaft of the motor through a coupling.

[0016] Optionally, a second magnetic gear that mates with the first magnetic gear is installed on the digestion tube rotator. The two ends of the second magnetic gear are axially positioned on the digestion tube rotator by locking nuts and bearing retaining rings.

[0017] Optionally, a motor mounting base and a guide rail mounting base are fixedly installed on the module upright plate. A Z-axis linear guide rail is fixedly installed on the guide rail mounting base. A Z-axis slider mounting plate is slidably installed on the Z-axis linear guide rail. A nut mounting base is fixedly installed on the Z-axis slider mounting plate. A Z-axis lead screw motor is fixedly installed on the motor mounting base. The output lead screw of the Z-axis lead screw motor is threadedly connected to the nut mounting base.

[0018] Optionally, the Z-axis pull-out cover assembly includes a cylinder mounting base fixedly mounted on the Z-axis slider mounting plate, a first gripper cylinder fixedly mounted on the cylinder mounting base, a guide rail mounting block fixedly mounted on the cylinder mounting base, linear guide rails fixedly mounted on both sides of the guide rail mounting block, a guide block mounting base slidably mounted on the linear guide rails, and a digestion tube guide block fixedly mounted on the guide block mounting base. The two output shafts of the first gripper cylinder are fixedly connected to different guide block mounting bases respectively through an adapter plate.

[0019] A lifting cylinder is fixedly installed inside the cylinder mounting base. An mounting plate is fixedly installed on the output shaft of the lifting cylinder. A guide rod is fixedly installed on the mounting plate. A linear bearing that mates with the guide rod is installed inside the cylinder mounting base. A second gripper cylinder and a third gripper cylinder are fixedly installed on the mounting plate. A digestion tube cap gripper is fixedly installed on the output shaft of both the second gripper cylinder and the third gripper cylinder.

[0020] Optionally, the acid spraying assembly includes a cylinder pad fixedly mounted on a Z-axis slider mounting plate, a slide cylinder fixedly mounted on the cylinder pad, and a mounting base fixedly mounted on the output shaft of the slide cylinder. The protective cover is fixedly connected to the mounting base, and a spray head seat is mounted on the mounting base. The spray head seat is fixedly connected to the mounting base via a pressure plate. A liquid filling pipe guide seat is fixedly mounted inside the spray head seat, and the liquid filling pipe and the liquid filling pipe guide seat are fixedly connected via a liquid filling pipe elastic pressure plate.

[0021] Optionally, a plug is fixedly installed inside the digestion tube lower seat, and an air extraction inlet is provided inside the digestion tube lower seat. The air extraction inlet is connected to the air extraction outlet through an air extraction pipe fixedly connected to the digestion tube lower seat. A vacuum system is installed on the base plate, and the vacuum system is connected to the air extraction pipe through an air extraction pipe sleeve.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] This application automates the entire process of removing the digestion tube cap, adding acid, and closing the cap, replacing the traditional manual acid addition method in a fume hood. This significantly reduces the health risks of operators being exposed to acid fumes and improves process flow efficiency. During the acid addition and spraying process, by setting the end of the liquid addition tube at a specific angle to the center line of the digestion tube, and cooperating with the continuous rotation of the digestion tube itself, the acid can be evenly flushed along the entire circumference of the inner wall of the digestion tube in an inclined direction. This effectively solves the problem of incomplete flushing coverage caused by insufficient liquid addition flow rate, ensuring that the target material adhering to the inner wall is completely flushed to the bottom of the tube to participate in the reaction during weighing, thereby ensuring the accuracy of subsequent mass spectrometry analysis for the detection of target element content.

[0024] By installing a protective cover at the acid addition port, a relatively enclosed space is formed with the digestion tube base, and the acid mist is promptly removed using the exhaust inlet located below the port. This strictly limits the acid mist corrosion range to the area near the port. Compared to the traditional method of placing the entire device in a fume hood, this significantly improves the protection of the device itself and optimizes laboratory environmental safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cap-removing and acid spraying device;

[0026] Figure 2 This is a schematic diagram of the cylinder mounting base.

[0027] Figure 3 This is a schematic diagram of the Z-axis pull-out cover assembly;

[0028] Figure 4 This is a schematic diagram of the digestion tube support box.

[0029] Figure 5 This is a schematic diagram of the internal structure of the digestion tube lower seat;

[0030] Figure 6 This is a schematic diagram of the air extraction pipe connection;

[0031] Figure 7 This is a schematic diagram of the digestion tube rotating assembly;

[0032] Figure 8 Schematic diagram of the acid spraying assembly Figure 1 ;

[0033] Figure 9 Schematic diagram of the acid spraying assembly Figure 2 .

[0034] Reference numerals in the attached diagram: 1. Y-axis linear guide; 2. Y-axis lead screw motor; 3. Linear guide support; 4. Lead screw bearing seat; 5. Base plate; 6. Z-axis lead screw motor; 7. Module upright plate; 8. Evacuation pipe sleeve; 9. Reinforcing rib plate; 10. Motor mounting base; 11. Nut mounting base; 12. Z-axis slider mounting plate; 13. Guide rail mounting base; 14. Lead screw support bearing; 15. Z-axis linear guide; 30. Digestion tube; 31. Tube cover; 32. Tube body; 40. Digestion tube rotating assembly; 50. Z-axis cap opening and closing assembly; 70. Acid spraying assembly; 90. Digestion tube carrier box; 51. First gripper cylinder; 52. Guide rail fixing block; 53. Linear guide rail; 54. Guide rod; 55. Linear bearing; 56. Digestion tube cap gripper; 57. Digestion tube guide block; 58. Guide block fixing seat; 59. Adapter plate; 60. Cylinder fixing seat; 61. Second gripper cylinder; 62. 63. Cylinder; 94. Third gripper cylinder; 95. Liquid receiving plate; 96. Digestion tube lower seat; 97. Slider adapter plate; 98. Bearing seat; 99. Second magnetic gear; 100. Locking nut; 101. Digestion tube rotating seat; 102. Bearing retaining ring; 103. Rotating seat guide block; 104. Rotating seat guide block pressure plate; 105. Deep groove ball bearing; 106. Photoelectric switch; 107. Photoelectric switch fixing seat; 108. Air extraction pipe; 109. Plug; 107. Air extraction inlet; 108. Air extraction outlet; 41. First magnetic gear; 42. Gear connecting shaft; 43. Second deep groove ball bearing; 44. Bearing support seat; 45. Coupling; 46. Motor; 71. Protective cover; 72. Fixed seat; 73. Spray head seat; 74. Pressure plate; 75. Slide cylinder; 76. Cylinder pad; 77. Liquid filling pipe guide seat; 78. Liquid filling pipe elastic pressure plate; 79. Liquid filling pipe; 80. Bending pipe. Detailed Implementation

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] Example: Figure 1 and Figure 3 As shown, the digestion tube cap removal and acid spraying device proposed in this application includes a modular upright plate 7 and a base plate 5 fixedly installed below the upright plate. A reinforcing rib plate 9 is fixedly installed between the base plate 5 and the modular upright plate 7. It also includes a digestion tube carrier box 90 for accommodating and supporting the digestion tube 30. The digestion tube 30 includes a tube body 32 and a tube cap 31 installed on the tube body 32. The digestion tube 30 is used to hold target substances, such as metal elements, organic matter, and inorganic salts, in the microwave digestion pretreatment process. During the acid addition process, the acid will react violently with the target substance and generate a large amount of acid mist. If the acid mist escapes, it will corrode the equipment and harm the health of the operators.

[0037] like Figure 1 , Figures 4 to 6As shown, the spraying device in this embodiment also includes a Y-axis transplanting assembly. The Y-axis transplanting assembly includes a linear guide rail support 3 fixedly installed on the base plate 5, a Y-axis linear guide rail 1 fixedly installed on the linear guide rail support 3, and a Y-axis lead screw motor 2 fixedly installed on the module upright plate 7. The Y-axis lead screw motor 2 includes a lead screw. A lead screw bearing seat 4 is installed on the linear guide rail support 3. A lead screw support bearing 14 that cooperates with the Y-axis lead screw motor 2 is installed on the lead screw bearing seat 4. When the Y-axis lead screw motor 2 rotates, it drives the lead screw to rotate. The lead screw support bearing 14 provides rotational support for the lead screw and bears radial load.

[0038] The digestion tube support box 90 includes a slider adapter plate 94 slidably mounted on the Y-axis linear guide rail 1, a digestion tube lower seat 93 fixedly mounted on the slider adapter plate 94, and a liquid receiving plate 91 fixedly mounted on the digestion tube lower seat 93. The liquid receiving plate 91 catches any residual liquid that may be left from the bent tube 80, preventing it from dripping onto the linear guide rail. A bearing seat 95 is installed inside the digestion tube lower seat 93, and a first deep groove ball bearing 102 is fixedly installed inside the bearing seat 95. The deep groove ball bearing 102 is equipped with a bearing for supporting the digestion tube. The first digestion tube rotating seat 98 of the digestion tube 30 is threadedly connected to the slider transition plate 94 and the Y-axis lead screw motor 2. When the Y-axis lead screw motor 2 rotates, it drives the slider transition plate 94 to reciprocate along the Y-axis linear guide rail 1 through the lead screw, thereby driving the digestion tube lower seat 93 and the digestion tube 30 it carries to be accurately transferred between the cap removal / closing station and the acid spraying station. The first digestion tube rotating seat 98 is used to support the bottom of the tube body 32 of the digestion tube 30. The first deep groove ball bearing 102 allows the digestion tube rotating seat 98 to rotate freely.

[0039] Furthermore, a rotating guide block 100 is installed inside the digestion tube lower seat 93. The rotating guide block 100 is connected to the digestion tube lower seat 93 through the rotating guide block pressure plate 101. A photoelectric switch fixing seat 104 is fixedly installed on one side of the digestion tube lower seat 93. A photoelectric switch 103 is fixedly installed on the photoelectric switch fixing seat 104. The rotating guide block 100 is used to provide radial limit and guidance for the rotational movement of the digestion tube rotating seat 98, ensuring the coaxiality and smooth operation of the digestion tube 30 during rotation. The photoelectric switch 103 is used to detect the rotational position of the digestion tube rotating seat 98 or the presence or absence of the digestion tube 30, providing a position feedback signal to the control system to ensure that processes such as transplanting, cap removal, and acid addition are performed in the correct position, avoiding misoperation.

[0040] like Figure 1As shown, in this embodiment, a motor mounting base 10 and a guide rail mounting base 13 are fixedly installed on the module upright plate 7. A Z-axis linear guide rail 15 is fixedly installed on the guide rail mounting base 13. A Z-axis slider mounting plate 12 is slidably installed on the Z-axis linear guide rail 15. A nut mounting base 11 is fixedly installed on the Z-axis slider mounting plate 12. A Z-axis lead screw motor 6 is fixedly installed on the motor mounting base 10. The output lead screw of the Z-axis lead screw motor 6 is threadedly connected to the nut mounting base 11. When the Z-axis lead screw motor 6 rotates forward or reverse, it drives the Z-axis slider mounting plate 12 to move up and down along the Z-axis linear guide rail 15 through the threaded engagement between the lead screw and the nut mounting base 11. The Z-axis linear guide rail 15 provides vertical guidance and support for the Z-axis slider mounting plate 12, ensuring the vertical movement accuracy of the Z-axis pull-out cover assembly 50.

[0041] like Figure 2 and Figure 3 As shown, the spraying device in this embodiment also includes a Z-axis cap-opening and closing assembly 50, used for opening and closing the cap on the digestion tube 30. The Z-axis cap-opening and closing assembly 50 includes a cylinder mounting base 60 fixedly mounted on the Z-axis slider mounting plate 12, a first gripper cylinder 51 fixedly mounted on the cylinder mounting base 60, a guide rail mounting block 52 fixedly mounted on the cylinder mounting base 60, linear guide rails 53 fixedly mounted on both sides of the guide rail mounting block 52, a guide block mounting base 58 slidably mounted on the linear guide rails 53, and a digestion tube guide fixedly mounted on the guide block mounting base 58. Block 57, the two output shafts of the first gripper cylinder 51 are fixedly connected to different guide block fixing seats 58 through the adapter plate 59. When the first gripper cylinder 51 is activated, its two output shafts drive the guide block fixing seats 58 on both sides to move towards or away from each other along the linear guide rail 53 through the adapter plate 59, thereby driving the two digestion tube guide blocks 57 to clamp or loosen the tube body 32 of the digestion tube 30. During the cap removal and cap closing process, the digestion tube guide blocks 57 clamp the tube body 32 to ensure that the tube body 32 is fixed in position and prevent the tube body 32 from being pulled up or tilted due to uneven force when the cap is removed.

[0042] Furthermore, a lifting cylinder 62 is fixedly installed inside the cylinder mounting base 60. An mounting plate is fixedly installed on the output shaft of the lifting cylinder 62. A guide rod 54 is fixedly installed on the mounting plate. A linear bearing 55 that mates with the guide rod 54 is installed inside the cylinder mounting base 60. A second gripper cylinder 61 and a third gripper cylinder 63 are fixedly installed on the mounting plate. A digestion tube cover gripper 56 is fixedly installed on the output shaft of both the second gripper cylinder 61 and the third gripper cylinder 63. When the second gripper cylinder 61 and the third gripper cylinder 63 are activated, they respectively drive their corresponding digestion tube cover gripper 56 to clamp or release the digestion tube cover 31. After clamping the tube cover 31, the output shaft of the lifting cylinder 62 retracts upward. The second gripper cylinder 61, the third gripper cylinder 63, and the digestion tube cover gripper 56 rise together through the mounting plate. Since the tube body 32 has been clamped and fixed by the digestion tube guide block 57, the tube cover 31 can be pulled out to complete the cap removal action.

[0043] When closing the cover, the operation is reversed. The lifting cylinder 62 extends to press down the tube cover 31 and fasten it onto the tube body 32. After the gripper is released, the lifting cylinder 62 resets. The guide rod 54 and the linear bearing 55 cooperate to provide guidance for the lifting and lowering movement of the mounting plate, ensuring that the movement trajectory of the tube cover 31 is vertical and accurate during the process of removing and closing the cover.

[0044] like Figure 8 and Figure 9 As shown, in this embodiment, the above-mentioned spraying device includes an acid spraying assembly 70, which includes at least one set of liquid addition pipes 79 and a protective cover 71 that is sealed and connected to the digestion tube carrier box 90. The end of the liquid addition pipe 79 is provided with a bent pipe 80, which is set at an angle of 30°-45° with the center line of the digestion tube 30. This tilt angle allows the acid to be evenly contacted on the entire inner wall circumference of the digestion tube 30 in an oblique flushing manner. With the rotation of the digestion tube 30, the target residue adhering to the inner wall of the tube body 32 during weighing can be thoroughly flushed to the bottom of the tube. If a vertical liquid addition method is used, the acid can only flush a local area at the bottom of the tube and cannot effectively clean the residue on the inner wall, which will affect the accuracy of subsequent mass spectrometry analysis in detecting the content of target elements.

[0045] Furthermore, the acid spraying assembly 70 includes a cylinder pad 76 fixedly mounted on the Z-axis slider fixing plate 12, a slide cylinder 75 fixedly mounted on the cylinder pad 76, and a fixing seat 72 fixedly mounted on the output shaft of the slide cylinder 75. A protective cover 71 is fixedly connected to the fixing seat 72. A spray head seat 73 is mounted on the fixing seat 72. The spray head seat 73 is fixedly connected to the fixing seat 72 via a pressure plate 74. A liquid addition pipe guide seat 77 is fixedly installed inside the spray head seat 73. 9 is fixedly connected to the liquid addition tube guide seat 77 via the liquid addition tube elastic pressure plate 78. The slide cylinder 75 is used to drive the fixed seat 72 and the liquid addition tube 79 and the protective cover 71 fixed thereon to move closer to or away from the opening of the digestion tube 30. When adding acid, the slide cylinder 75 extends so that the bent tube 80 of the liquid addition tube 79 extends into the opening of the digestion tube 30 and the protective cover 71 covers the top of the opening. After the acid is added, the slide cylinder 75 retracts so that the liquid addition tube 79 exits the opening area to avoid interfering with the transfer of the digestion tube 30.

[0046] The liquid addition pipe guide seat 77 and the liquid addition pipe elastic pressure plate 78 are used to fix the liquid addition pipe 79 and ensure that the spray angle of the bent pipe 80 is accurate and stable. When adding acid, the protective cover 71 cooperates with the digestion pipe lower seat 93 to form a relatively closed space, which restricts the acid mist to a limited area so that the extraction device can extract it in a concentrated manner.

[0047] The Y-axis transfer assembly is used to transfer the digestion tube 30 between the Z-axis cap removal and closing assembly 50 and the acid spraying assembly 70. Driven by the Y-axis lead screw motor 2, the digestion tube 30, which has been capped, is transferred from the cap removal / closing station to the acid spraying station for acid spraying. After the acid spraying is completed, the Z-axis cap removal and closing assembly 50 is moved to close the cap.

[0048] like Figures 4 to 7 As shown, in this embodiment, the acid spraying device further includes a digestion tube rotating assembly 40 for driving the digestion tube 30 to rotate. The digestion tube rotating assembly 40 includes a motor 46 fixedly mounted on the base plate 5 and a first magnetic gear 41 rotatably mounted on the base plate 5. A bearing support 44 is fixedly mounted on the base plate 5, and a second deep groove ball bearing 43 is mounted on the bearing support 44. A gear connecting shaft 42 is mounted on the deep groove ball bearing. One end of the gear connecting shaft 42 is coaxially and fixedly connected to the first magnetic gear 41, and the other end is connected to a coupling 4. 5 is coaxially fixedly connected to the output shaft of motor 46. When motor 46 rotates, it drives gear connecting shaft 42 to rotate through coupling 45. Gear connecting shaft 42 then drives the first magnetic gear 41 to rotate synchronously. The second deep groove ball bearing 43 provides rotational support for gear connecting shaft 42 to ensure smooth rotation of the first magnetic gear 41. This rotary drive assembly adopts non-contact magnetic coupling transmission with digestion tube 30, avoiding the wear and leakage risks caused by mechanical seals, and at the same time facilitating the reciprocating transfer of digestion tube carrier box 90 in the Y-axis direction.

[0049] The digestion tube rotating seat 98 is equipped with a second magnetic gear 96 that cooperates with the first magnetic gear 41. The two ends of the second magnetic gear 96 are axially positioned on the digestion tube rotating seat 98 by locking nuts 97 and bearing retaining rings 99. The first magnetic gear 41 and the second magnetic gear 96 achieve non-contact torque transmission through magnetic coupling. When the motor 46 drives the first magnetic gear 41 to rotate, the second magnetic gear 96 rotates synchronously under the action of magnetic force, driving the digestion tube rotating seat 98 and the digestion tube 30 placed on it to rotate together. The locking nuts 97 and bearing retaining rings 99 are used to fix the second magnetic gear 96 axially on the digestion tube rotating seat 98 to prevent axial movement during transmission. The digestion tube 30 rotates continuously during the acid spraying process to ensure that the acid sprayed from the bent tube 80 can be evenly rinsed to the entire circumference of the inner wall of the tube body 32, effectively solving the problem of incomplete spray coverage caused by the small flow rate of the liquid addition tube.

[0050] like Figure 6 and Figure 8 As shown, the spraying device in this embodiment also includes an extraction device for extracting acid mist during the acid spraying process. The extraction outlet 108 of the extraction device is connected to the digestion tube carrier box 90 and located below the opening of the digestion tube 30. A plug 106 is fixedly installed in the digestion tube lower seat 93. An extraction inlet 107 is provided in the digestion tube lower seat 93. The extraction inlet 107 is connected to the extraction outlet 108 through an extraction pipe 105 fixedly connected to the digestion tube lower seat 93. A vacuum system is installed on the base plate 5. The vacuum system is connected to the extraction pipe 105 through an extraction pipe sleeve 8. Under the vacuum suction, the acid mist generated during the acid spraying process is extracted from near the opening of the digestion tube 30 through the extraction inlet 107, the extraction pipe 105, the extraction outlet 108, and the extraction pipe sleeve 8 by the vacuum system for treatment. Compared with the traditional method of placing the entire equipment in a fume hood, the corrosion range and diffusion space of the acid mist are greatly reduced, effectively protecting the equipment from acid mist corrosion and ensuring the health and safety of the operators.

[0051] It is worth noting that no sealing ring is provided between the protective cover 71 and the lower seat 93 of the digestion tube, forming a relatively closed space. This allows a certain amount of outside air to be drawn in through the gap, forming a directional airflow that guides the acid mist toward the air extraction inlet 107, improving the air extraction efficiency and avoiding excessive pressure inside the tube due to complete sealing, which would affect the normal operation of acid spraying.

[0052] Working principle: First, the external robotic arm places the digestion tube 30 containing the target object into the digestion tube turntable 98. The transfer assembly then transports it to the cap removal station. The first gripper cylinder 51 in the cap removal assembly first clamps the tube body 32. Then, the lifting cylinder 62, together with the second gripper cylinder 61, the third gripper cylinder 63 and the digestion tube cap gripper 56, pulls the tube cap 31 upward. After the cap removal is completed, the transfer assembly sends the tube body 32 to the acid spraying station.

[0053] At this time, the slide cylinder 75 drives the protective cover 71 and the bent liquid addition tube 79 to approach the tube opening. The motor 46 drives the digestion tube 30 to rotate continuously through the magnetic coupling of the first magnetic gear 41 and the second magnetic gear 96. At the same time, the liquid addition tube 79 sprays acid liquid onto the inner wall of the tube at a specific tilt angle. The rotating tube body 32 and the oblique liquid flow work together to make the acid liquid fully cover the circumferential area of ​​the inner wall, thoroughly flushing the adhering matter to the bottom, which significantly improves the consistency of the pretreatment before digestion and ensures the accuracy of subsequent testing.

[0054] Throughout the acid spraying process, the air inlet 107 located below the pipe opening continuously draws in the air. Combined with the relatively enclosed space formed by the protective cover 71 and the digestion tube lower seat 93, the acid mist is firmly confined to a small area and discharged in time, effectively solving the problem of acid mist spreading and corroding the equipment.

[0055] After the acid addition is completed, the transplanting assembly sends the tube body 32 back to the cap removal station, the cap closing assembly clamps the cap 31 in the reverse action, and finally the transplanting assembly resets, completing the fully automated cycle.

[0056] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A digestion tube cap removal and acid spraying device, comprising a modular upright plate (7) and a base plate (5) fixedly installed below the upright plate, characterized in that, Also includes: Digestion tube carrier box (90) for accommodating digestion tube (30); Digestion tube rotating assembly (40) for driving the digestion tube (30) to rotate; Z-axis cap removal and closing assembly (50) is used to remove and close the cap on the digestion tube (30); The acid spraying assembly (70) includes at least one set of liquid addition pipes (79) and a protective cover (71) that is sealed to the digestion tube carrier box (90). The end of the liquid addition pipe (79) is provided with a bent pipe (80), and the bent pipe (80) is set at an angle of 30°-45° with the center line of the digestion tube (30). An air extraction device for extracting acid mist during acid spraying, wherein the air extraction outlet (108) of the air extraction device is connected to the digestion tube carrier box (90) and located below the opening of the digestion tube (30); The Y-axis transfer assembly is used to transfer the digestion tube (30) between the Z-axis cap-closing assembly (50) and the acid spraying assembly (70).

2. The digestion tube cap removal and acid spraying device according to claim 1, characterized in that, The Y-axis transplanting assembly includes a linear guide support (3) fixedly installed on the base plate (5), a Y-axis linear guide (1) fixedly installed on the linear guide support (3), and a Y-axis lead screw motor (2) fixedly installed on the module upright plate (7). The Y-axis lead screw motor (2) includes a lead screw. A lead screw bearing seat (4) is installed on the linear guide support (3), and a lead screw support bearing (14) that cooperates with the Y-axis lead screw motor (2) is installed on the lead screw bearing seat (4).

3. The digestion tube cap removal and acid spraying device according to claim 2, characterized in that, The digestion tube carrier box (90) includes a slider adapter plate (94) slidably mounted on the Y-axis linear guide rail (1), a digestion tube lower seat (93) fixedly mounted on the slider adapter plate (94), and a liquid receiving plate (91) fixedly mounted on the digestion tube lower seat (93). A bearing seat (95) is installed inside the digestion tube lower seat (93). A first deep groove ball bearing (102) is fixedly installed inside the bearing seat (95). A first digestion tube rotating seat (98) for carrying the digestion tube (30) is installed inside the deep groove ball bearing (102). The slider adapter plate (94) is threadedly connected to the Y-axis lead screw motor (2).

4. The digestion tube cap removal and acid spraying device according to claim 3, characterized in that, A rotating guide block (100) is installed inside the digestion tube lower seat (93). The rotating guide block (100) is connected to the digestion tube lower seat (93) through a rotating guide block pressure plate (101). A photoelectric switch fixing seat (104) is fixedly installed on one side of the digestion tube lower seat (93). A photoelectric switch (103) is fixedly installed on the photoelectric switch fixing seat (104).

5. The digestion tube cap removal and acid spraying device according to claim 3, characterized in that, The digestion tube rotating assembly (40) includes a motor (46) fixedly mounted on a base plate (5) and a first magnetic gear (41) rotatably mounted on the base plate (5). A bearing support seat (44) is fixedly mounted on the base plate (5). A second deep groove ball bearing (43) is mounted on the bearing support seat (44). A gear connecting shaft (42) is mounted on the deep groove ball bearing. One end of the gear connecting shaft (42) is coaxially fixedly connected to the first magnetic gear (41), and the other end is coaxially fixedly connected to the output shaft of the motor (46) through a coupling (45).

6. The digestion tube cap removal and acid spraying device according to claim 5, characterized in that, The digestion tube rotator (98) is equipped with a second magnetic gear (96) that cooperates with the first magnetic gear (41). The two ends of the second magnetic gear (96) are axially positioned on the digestion tube rotator (98) by locking nuts (97) and bearing retaining rings (99).

7. The digestion tube cap removal and acid spraying device according to claim 1, characterized in that, The module stand plate (7) is fixedly installed with a motor mounting base (10) and a guide rail mounting base (13). The guide rail mounting base (13) is fixedly installed with a Z-axis linear guide rail (15). The Z-axis linear guide rail (15) is slidably installed with a Z-axis slider mounting plate (12). The Z-axis slider mounting plate (12) is fixedly installed with a nut mounting base (11). The motor mounting base (10) is fixedly installed with a Z-axis lead screw motor (6). The output lead screw of the Z-axis lead screw motor (6) is threadedly connected to the nut mounting base (11).

8. The digestion tube cap removal and acid spraying device according to claim 7, characterized in that, The Z-axis pull-out cover assembly (50) includes a cylinder mounting base (60) fixedly mounted on the Z-axis slider mounting plate (12), a first gripper cylinder (51) fixedly mounted on the cylinder mounting base (60), a guide rail mounting block (52) fixedly mounted on the cylinder mounting base (60), linear guide rails (53) fixedly mounted on both sides of the guide rail mounting block (52), a guide block mounting base (58) slidably mounted on the linear guide rail (53), and a digestion tube guide block (57) fixedly mounted on the guide block mounting base (58). The two output shafts of the first gripper cylinder (51) are fixedly connected to different guide block mounting bases (58) respectively through an adapter plate (59). A lifting cylinder (62) is fixedly installed inside the cylinder mounting base (60). A mounting plate is fixedly installed on the output shaft of the lifting cylinder (62). A guide rod (54) is fixedly installed on the mounting plate. A linear bearing (55) that cooperates with the guide rod (54) is installed inside the cylinder mounting base (60). A second gripper cylinder (61) and a third gripper cylinder (63) are fixedly installed on the mounting plate. A digestion tube cap gripper (56) is fixedly installed on the output shaft of both the second gripper cylinder (61) and the third gripper cylinder (63).

9. The digestion tube cap removal and acid spraying device according to claim 7, characterized in that, The acid spraying assembly (70) includes a cylinder pad (76) fixedly installed on the Z-axis slider fixing plate (12), a slide cylinder (75) fixedly installed on the cylinder pad (76), and a fixing seat (72) fixedly installed on the output shaft of the slide cylinder (75). The protective cover (71) is fixedly connected to the fixing seat (72). A spray head seat (73) is installed on the fixing seat (72). The spray head seat (73) is fixedly connected to the fixing seat (72) through a pressure plate (74). A liquid filling pipe guide seat (77) is fixedly installed inside the spray head seat (73). The liquid filling pipe (79) and the liquid filling pipe guide seat (77) are fixedly connected through a liquid filling pipe elastic pressure plate (78).

10. The digestion tube cap removal and acid spraying device according to claim 3, characterized in that, A plug (106) is fixedly installed inside the digestion tube lower seat (93). An air extraction inlet (107) is provided inside the digestion tube lower seat (93). The air extraction inlet (107) is connected to the air extraction outlet (108) through an air extraction pipe (105) fixedly connected to the digestion tube lower seat (93). A vacuum system is installed on the base plate (5). The vacuum system is connected to the air extraction pipe (105) through an air extraction sleeve (8).

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