Dustproof gas chromatograph

Abstract

This invention relates to the field of gas chromatographs, specifically a dustproof gas chromatograph, comprising a chromatograph body with a column chamber, a hinged closed cabinet door on the column chamber, and a receiving cavity. A protective cover consisting of a main cover plate, side cover plates, and a top cover plate with a second sealing strip is installed within the receiving cavity, and a lifting mechanism is used for lifting control. This allows for quick access to the operating interface when using the touchscreen and complete sealing to prevent dust from entering when not in use. Furthermore, a protective cover with a first sealing strip is installed on the support column, which can be flexibly covered or moved using the lifting mechanism to prevent sample vials from accumulating dust. The sampling mechanism is integrated inside the support column, further isolating it from external dust. This not only avoids the problem of dust accumulation on the touchscreen panel affecting aesthetics but, more importantly, completely isolates the sample sampling area from external environmental contamination, ensuring the accuracy of the detection results is not interfered with.

Description

Technical Field

[0001] This invention relates to the field of gas chromatography technology, and specifically to a dustproof gas chromatograph. Background Technology

[0002] Gas chromatographs are instruments that use chromatographic separation and detection techniques to perform qualitative and quantitative analysis of complex mixtures of multiple components. Gas chromatographs use gas as the mobile phase. When a sample is injected into the injector via a microsyringe, it is carried by the carrier gas into a packed or capillary column. Due to differences in the distribution or adsorption coefficients of the components in the sample between the mobile and stationary phases in the column, the components undergo repeated distribution between the two phases under the flushing effect of the carrier gas, resulting in separation of the components within the column. Then, a detector connected to the column detects each component sequentially based on its physicochemical properties. Since the gas chromatograph feeds the sample by placing the carrier gas sample inside a fixture and using a sampler to inject the sample, the sampling tip of the sampler is exposed to the outside under normal circumstances. Dust on the sampling tip can contaminate the sample during sampling; therefore, dust protection is necessary for the gas chromatograph.

[0003] Chinese patent CN211627465U discloses an improved dustproof gas chromatograph. It features a groove on the side of the gas chromatograph body and a touch panel installed inside the groove. When the gas chromatograph is in use, the protective cover rotates to the vertical direction between the inner wall of the limiting groove. When the gas chromatograph is not in use, the protective cover protects the touch panel inside the groove from dust, making operation simple.

[0004] While the above solution achieves dust protection for the touch panel through a flip-up protective cover, the dust on the touch panel does not affect the accuracy of the final test results. In contrast, the sampler is still exposed to the external environment, and the dust attached to it will directly affect the accuracy of the final results. Moreover, the foolproof effect of the protective structure is limited, which also affects the safety of users during use.

[0005] Therefore, the present invention provides a dustproof gas chromatograph to solve the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a dustproof gas chromatograph to solve the problem that dust on the touch panel does not affect the accuracy of the final detection results, while the sampler is exposed to the external environment and the dust attached to it will directly affect the accuracy of the final results. Moreover, the foolproof effect of the protective structure is limited, which also affects the safety of users during use.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A dustproof gas chromatograph includes:

[0009] The chromatograph body has a column chamber, a closed cabinet door is hinged to the column chamber, and a receiving cavity is provided on the chromatograph body, with a touch screen structure installed inside the receiving cavity.

[0010] A protective cover, located inside the receiving cavity, is used to protect the touchscreen structure from dust.

[0011] The lifting mechanism, located on the chromatograph body, is used to move the protective cover up and down in the receiving cavity.

[0012] The locking mechanism, located on the chromatograph body, is used to limit the sealing cabinet door within the column chamber after the protective cover has risen and moved.

[0013] A support column is provided, on which a protective cover is slidably connected. A sample placement mechanism for holding the sample is provided below the support column, and a lifting mechanism for raising and lowering the protective cover is provided on the support column.

[0014] The sampling mechanism, located inside the support column, is used to inject and sample the samples placed on the sampling mechanism.

[0015] The linkage mechanism, located inside the support column, is linked with the lifting mechanism and simultaneously limits the sampling mechanism and the placement mechanism after the protective cover rises and moves.

[0016] Preferably, the protective cover includes a main cover plate, two side cover plates are fixedly connected to the main cover plate, an upper cover plate is fixedly connected to the upper surface of the main cover plate, and a second sealing strip is embedded on the side of the upper cover plate near the chromatograph body.

[0017] Preferably, the lifting mechanism includes a fixed housing fixedly connected to the chromatograph body, a second electric push rod is installed on the fixed housing, a linkage plate is detachably installed on the telescopic end of the second electric push rod, and one end of the linkage plate is fixedly connected to the upper cover plate.

[0018] Preferably, the telescopic end of the second electric push rod is fixedly connected to a bearing plate, a threaded post is fixedly connected to the bearing plate, a through hole is provided on the linkage plate, and a locking nut is threadedly connected to the top of the threaded post through the through hole.

[0019] Preferably, the locking mechanism includes a second control cavity opened on the chromatograph body and a limiting hole opened on the closed cabinet door. A support base is fixedly connected in the second control cavity, and a linkage rod is slidably connected on the support base. One end of the linkage rod matches the limiting hole, and the other end of the linkage rod is fixedly connected to a first wedge block. Both ends of the linkage rod are located outside the second control cavity.

[0020] Preferably, a second wedge block is fixedly connected to the side cover plate. Both the second wedge block and the first wedge block have inclined grooves. A guide rod is fixedly connected to the first wedge block, and one end of the guide rod is inserted into the second control cavity. A pressure plate is fixedly connected to the linkage rod, and a return spring is sleeved on the linkage rod. The two ends of the return spring abut against the support seat and the pressure plate, respectively.

[0021] Preferably, the sample placement mechanism includes a fixed box fixedly connected to the chromatograph body, a first motor is installed inside the fixed box, a turntable is fixedly connected to the output shaft of the first motor, and a storage dish is fixedly connected to the turntable.

[0022] Preferably, the lifting mechanism includes a second motor mounted on a support column and a moving slot formed on the support column. The output shaft of the second motor is equipped with a one-way screw, which is rotatably connected to the moving slot. A slider is threaded onto the one-way screw. One end of the slider is slidably connected to the moving slot, and the other end of the slider is fixedly connected to a connecting plate, which is fixedly connected to a protective cover. A first sealing strip is installed on the protective cover.

[0023] Preferably, the sampling mechanism includes a first control cavity opened on a support column, a first electric push rod installed in the first control cavity, a transfer box installed at the telescopic end of the first electric push rod, an injection needle fixedly connected to the bottom surface of the transfer box, and the bottom end of the injection needle penetrating the first control cavity and extending above the storage dish.

[0024] Preferably, the linkage mechanism includes a third control cavity and a fourth control cavity formed on the support column. The support column has a first guide groove and a second guide groove. The fourth control cavity is connected to the first control cavity through the first guide groove and the second guide groove. A bidirectional screw is rotatably connected to the fourth control cavity. A second pulley is installed on the bidirectional screw. A first pulley is installed on the unidirectional screw, and the first pulley and the second pulley are connected in a driving connection. A first sliding plate and a second sliding plate are threadedly connected to the bidirectional screw. One end of the first sliding plate passes through the first guide groove and extends into the first control cavity. One end of the second sliding plate passes through the second guide groove and is fixedly connected to a limiting pin that matches the limiting hole.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. A protective cover consisting of a main cover plate, side cover plates, and an upper cover plate with a second sealing strip is installed inside the receiving cavity. This cover, combined with a lifting mechanism for height control, allows for quick exposure of the operating interface when the touchscreen is in use, and complete sealing to prevent dust from entering when idle. Furthermore, a protective cover with a first sealing strip is installed on the support column, allowing the lifting mechanism to flexibly cover or remove the sample opening mechanism, preventing dust accumulation on the sample vials. The sampling mechanism is integrated inside the support column, further isolating it from external dust. This not only avoids the aesthetic problem of dust accumulation on the touchscreen panel but, more importantly, completely isolates the sample sampling area from external environmental contamination, ensuring the accuracy of the test results remains unaffected.

[0027] 2. By setting a detachable connection structure in the lifting mechanism, the telescopic end of the second electric push rod is connected to the linkage plate through the bearing plate, threaded column, and locking nut. When the electric push rod fails, the user can remove the locking nut to disconnect the connection and manually drive the protective cover to rise and fall. This avoids the touch screen structure from becoming unusable due to the failure of a single drive component, and greatly improves the fault tolerance and long-term reliability of the equipment.

[0028] 3. The locking mechanism works in conjunction with the protective cover. When the protective cover rises, the second wedge block of the side cover plate presses against the first wedge block, causing the linkage rod to move laterally and insert into the limiting hole of the closed cabinet door, forcibly locking the closed cabinet door of the column chamber. This prevents the cabinet door from being accidentally opened during equipment operation, thus disrupting the temperature control and separation environment of the chromatographic column inside the column chamber, ensuring the stability of the detection process and the safety of the operators. Furthermore, the linkage mechanism enables coordinated control of the protective cover and the sampling and placement mechanisms. When the protective cover rises, the unidirectional screw drives the bidirectional screw to rotate via the first and second pulleys, causing the first sliding plate to move below the transfer box to block the sampling mechanism. Simultaneously, the limiting pin of the second sliding plate inserts into the limiting hole of the turntable to fix the placement mechanism, ensuring that the sampling component does not move and the placement component does not rotate when placing samples. This completely avoids problems such as sample spillage and needle damage caused by misoperation, constructing a complete operational safety barrier. Attached Figure Description

[0029] Figure 1 The three-dimensional form under the limitation of the present invention Figure 1 .

[0030] Figure 2 For the present invention Figure 1 An enlarged schematic diagram of the structure at point A in the middle.

[0031] Figure 3 The three-dimensional form under the limitation of the present invention Figure 2 .

[0032] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B.

[0033] Figure 5 Cross-sectional view of the present invention Figure 1 .

[0034] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C.

[0035] Figure 7 This is a perspective view of the present invention in the feeding state.

[0036] Figure 8 Cross-sectional view of the present invention Figure 2 .

[0037] Figure 9 For the present invention Figure 8 An enlarged schematic diagram of the structure at point D.

[0038] Figure 10 For the present invention Figure 8 Enlarged schematic diagram of the structure at point E.

[0039] In the diagram: 1. Chromatograph body; 2. Column chamber; 3. Sealed cabinet door; 4. Sampling mechanism; 41. First control chamber; 42. First electric actuator; 43. Transfer box; 44. Injection needle; 5. Sample placement mechanism; 51. Fixed box; 52. First motor; 53. Turntable; 54. Storage dish; 55. Restriction hole; 56. Limiting pin; 6. Lifting mechanism; 61. Fixed outer shell; 62. Second electric actuator; 63. Support plate; 64. Threaded column; 65. Locking nut; 66. Linkage plate; 7. Lifting mechanism; 71. Second motor; 72. Moving slot; 73. One-way screw; 74. Slider; 75. Connecting plate; 8. Locking mechanism; 81. 82. Second control chamber; 83. Support base; 84. Linkage rod; 85. Limiting hole; 86. First wedge block; 87. Guide rod; 88. Pressure plate; 89. Return spring; 90. Second wedge block; 91. Linkage mechanism; 92. Third control chamber; 93. Bidirectional screw; 94. First pulley; 95. Fourth control chamber; 96. Second pulley; 97. First sliding plate; 98. Second sliding plate; 99. First guide groove; 10. Second guide groove; 11. Touch screen structure; 12. Main cover plate; 13. Support column; 14. Protective cover; 15. First sealing strip; 16. Top cover plate; 17. Second sealing strip; 18. Side cover plate; 19. Receiving cavity. Detailed Implementation

[0040] The following will refer to the attached reference. Figures 1 to 10 The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] A dustproof gas chromatograph includes a chromatograph body 1, a protective cover, a lifting mechanism 6, a locking mechanism 8, a support column 12, a sampling mechanism 4, and a linkage mechanism 9.

[0042] The chromatograph body 1 has a column chamber 2. In this embodiment, the column chamber 2 is equipped with a chromatographic column, temperature control components, etc. The various components in the sample are separated in the column chamber 2. A closed cabinet door 3 is hinged to the column chamber 2 to close the opening of the column chamber 2. The chromatograph body 1 has a receiving cavity 18. A touch screen structure 10 is provided in the receiving cavity 18. The touch screen structure 10 is an existing structure with a panel and buttons, which can control the chromatograph.

[0043] In this embodiment, the protective cover is disposed in the receiving cavity 18 for dust protection of the touch screen structure 10. The protective cover includes a main cover plate 11, two side cover plates 17 are fixedly connected to the main cover plate 11, and an upper cover plate 15 is fixedly connected to the upper surface of the main cover plate 11. A second sealing strip 16 is embedded on the side of the upper cover plate 15 near the chromatograph body 1.

[0044] The main cover plate 11 is made of transparent material, which can be plastic or glass. The two side cover plates 17 are located at both ends of the main cover plate 11 near the touch screen structure 10, and together with the upper cover plate 15, they form a cover structure with openings at the bottom and sides. The protective cover protects the touch screen structure 10 from dust in the receiving cavity 18. In addition, the second sealing strip 16 improves the sealing of the upper cover plate 15 covering the chromatograph body 1, reducing the amount of dust entering the receiving cavity 18.

[0045] When the user needs to access the touchscreen structure 10, the protective cover can be moved upward within the receiving cavity 18 to expose the touchscreen structure 10 to the outside.

[0046] In this embodiment, the lifting mechanism 6 is disposed on the chromatograph body 1 and is used to drive the protective cover to move up and down on the receiving cavity 18. The lifting mechanism 6 includes a fixed outer shell 61 fixedly connected to the chromatograph body 1. A second electric push rod 62 is installed on the fixed outer shell 61. A linkage plate 66 is detachably installed on the telescopic end of the second electric push rod 62. One end of the linkage plate 66 is fixedly connected to the upper cover plate 15.

[0047] The chromatograph body 1 is equipped with a control button connected to the second electric push rod 62. When the touch screen structure 10 needs to be used, the extension end of the second electric push rod 62 drives the linkage plate 66 to move upward, and the linkage plate 66 drives the protective cover to move upward through the upper cover plate 15, thereby exposing the touch screen structure 10 to the outside for use.

[0048] When the touch screen structure 10 is not in use, the telescopic end of the second electric push rod 62 drives the linkage plate 66 to move downward, and the linkage plate 66 drives the protective cover to move downward through the upper cover plate 15, so that the protective cover can protect the touch screen structure 10 from dust.

[0049] The second electric push rod 62 has a bearing plate 63 fixedly connected to its telescopic end. A threaded post 64 is fixedly connected to the bearing plate 63. A through hole is opened on the linkage plate 66. The top of the threaded post 64 passes through the through hole and is threadedly connected to a locking nut 65.

[0050] After the second electric push rod 62 malfunctions, the user screws the locking nut 65 off the threaded post 64 and removes the linkage plate 66 from the threaded post 64 through the through hole, thus disconnecting the linkage plate 66 from the support plate 63. The user can then move the upper cover plate 15 up and down by using the linkage plate 66.

[0051] In this embodiment, the locking mechanism 8 is disposed on the chromatograph body 1 and is used to limit the closed cabinet door 3 within the column chamber 2 after the protective cover is raised and moved. The locking mechanism 8 includes a second control cavity 81 opened on the chromatograph body 1 and a limiting hole 84 opened on the closed cabinet door 3. A support base 82 is fixedly connected in the second control cavity 81, and a linkage rod 83 is slidably connected on the support base 82. One end of the linkage rod 83 matches the limiting hole 84, and the other end of the linkage rod 83 is fixedly connected to a first wedge block 85. Both ends of the linkage rod 83 are located outside the second control cavity 81.

[0052] The linkage rod 83 is preferably a square rod, so that the linkage rod 83 can move laterally on the support base 82 without rotating. After the linkage rod 83 is moved laterally, one end of the linkage rod 83 is inserted into the limiting hole 84, which can limit the closed cabinet door 3 in the closed state, so that the closed cabinet door 3 is in the closed state when the user operates the touch screen structure 10, preventing the closed cabinet door 3 from being opened when the device is in operation.

[0053] Specifically, a second wedge block 89 is fixedly connected to the side cover plate 17. Both the second wedge block 89 and the first wedge block 85 are provided with inclined grooves. A guide rod 86 is fixedly connected to the first wedge block 85, and one end of the guide rod 86 is inserted into the second control cavity 81. A pressure plate 87 is fixedly connected to the linkage rod 83. A reset spring 88 is sleeved on the linkage rod 83. The two ends of the reset spring 88 abut against the support seat 82 and the pressure plate 87, respectively.

[0054] When the side cover plate 17 moves upward, the second wedge block 89 pushes the first wedge block 85 through the inclined groove, so that the second wedge block 89 rises to a certain height and drives the first wedge block 85 to move laterally along the linkage rod 83. At this time, the linkage rod 83 limits the closed cabinet door 3, and the touch screen structure 10 is exposed to the outside. When the side cover plate 17 falls back to its original position, the first wedge block 85 is quickly reset under the elastic action of the return spring 88, thereby releasing the limitation on the closed cabinet door 3.

[0055] In this embodiment, a protective cover 13 is slidably connected to the support column 12, and a sample placement mechanism 5 for holding samples is provided below the support column 12. The sample placement mechanism 5 includes a fixed box 51 fixedly connected to the chromatograph body 1, a first motor 52 is installed in the fixed box 51, a turntable 53 is fixedly connected to the output shaft of the first motor 52, a storage dish 54 is fixedly connected to the turntable 53, and a lifting mechanism 7 for raising and lowering the protective cover 13 is provided on the support column 12.

[0056] The storage dish 54 consists of multiple cylinders arranged in a circumferential array. When storing samples, the bottom of the sample bottle can be inserted into the inside of the storage dish 54. The output shaft of the first motor 52 drives the turntable 53 to rotate, which can rotate and move the sample in the storage dish 54 to the sampling position for sampling.

[0057] In this embodiment, the lifting mechanism 7 includes a second motor 71 mounted on the support column 12 and a moving groove 72 opened on the support column 12. The output shaft of the second motor 71 is equipped with a one-way screw 73, and the one-way screw 73 is rotatably connected to the moving groove 72. A slider 74 is threadedly connected to the one-way screw 73. One end of the slider 74 is slidably connected to the moving groove 72, and the other end of the slider 74 is fixedly connected to a connecting plate 75. The connecting plate 75 is fixedly connected to the protective cover 13, and a first sealing strip 14 is installed on the protective cover 13.

[0058] The first sealing strip 14 is located on the contact surface between the protective cover 13 and the support column 12, enhancing the sealing performance of the protective cover 13 on the support column 12. The output shaft of the second motor 71 drives the one-way screw 73 to rotate clockwise, enabling the slider 74 to move upward inside the moving groove 72. The slider 74 also drives the protective cover 13 to move upward through the connecting plate 75, allowing the protective cover 13 to be removed from the sampling mechanism 5 and exposing the sampling mechanism 5 to the outside. At this time, the user can place the sample bottle inside the sampling mechanism 5.

[0059] After the sample vials are placed, the output shaft of the second motor 71 drives the one-way screw 73 to rotate counterclockwise, which enables the slider 74 to move downward inside the moving groove 72. The slider 74 also drives the protective cover 13 to move downward through the connecting plate 75, covering the outside of the sample placement mechanism 5 and providing dust protection for the sample placement mechanism 5.

[0060] The sampling mechanism 4 is located inside the support column 12 and is used to inject and sample the sample placed on the sampling mechanism 5. The sampling mechanism 4 includes a first control cavity 41 opened on the support column 12. A first electric push rod 42 is installed in the first control cavity 41. A transfer box 43 is installed at the telescopic end of the first electric push rod 42. An injection needle 44 is fixedly connected to the bottom surface of the transfer box 43. The bottom end of the injection needle 44 passes through the first control cavity 41 and extends to the top of the storage dish 54.

[0061] The transfer box 43 has a hollow structure and is connected to the chromatographic column through a hose. The hose allows the transfer box 43 to remain connected to the chromatographic column while moving. The transfer box 43 is moved downward by the telescopic end of the first electric push rod 42, and the injection needle 44 is inserted into the sample vial for sampling.

[0062] In this embodiment, the linkage mechanism 9 is disposed inside the support column 12 and is linked with the lifting mechanism 7. After the protective cover 13 moves upward, it synchronously completes the limiting of the sampling mechanism 4 and the placement mechanism 5. The linkage mechanism 9 includes a third control cavity 91 and a fourth control cavity 94 opened on the support column 12. A first guide groove 98 and a second guide groove 99 are opened inside the support column 12. The fourth control cavity 94 is connected to the first control cavity 41 through the first guide groove 98 and the second guide groove 99. A bidirectional screw 92 is rotatably connected to the fourth control cavity 94. A second pulley 95 is installed on the bidirectional screw 92. A first pulley 93 is installed on the unidirectional screw 73, and the first pulley 93 is connected to the second pulley 95 in a transmission connection. A first sliding plate 96 and a second sliding plate 97 are threadedly connected to the bidirectional screw 92. One end of the first sliding plate 96 passes through the first guide groove 98 and extends into the first control cavity 41. One end of the second sliding plate 97 passes through the second guide groove 99 and is fixedly connected with a limiting pin 56 that matches the limiting hole 55.

[0063] When the second motor 71 rotates clockwise, the unidirectional screw 73 drives the bidirectional screw 92 to rotate clockwise synchronously through the first pulley 93 and the second pulley 95. At this time, the protective cover 13 moves above the lofting mechanism 5. The bidirectional screw 92 is a rod with opposite threads at both ends. After the bidirectional screw 92 rotates, the first sliding plate 96 and the second sliding plate 97 move away from each other. At this time, the first sliding plate 96 slides in the first guide groove 98 and moves to the bottom of the transfer box 43, forming a blockage for the transfer box 43. The second sliding plate 97 slides in the second guide groove 99 and moves to the top of the turntable 53, and inserts the limiting pin 56 into the limiting hole 55 to limit the turntable 53.

[0064] Conversely, when the protective cover 13 is covering the layout mechanism 5, the first sliding plate 96 and the second sliding plate 97 will release the limits of the transfer box 43 and the turntable 53, respectively.

[0065] Working principle:

[0066] When storing samples, the second motor 71 is started, causing the unidirectional screw 73 to rotate clockwise. The unidirectional screw 73, through the first pulley 93 and the second pulley 95, drives the bidirectional screw 92 to rotate clockwise synchronously. When the slider 74 moves in the moving groove 72, it drives the protective cover 13 to move upward through the connecting plate 75, and moves the protective cover 13 above the sample placement mechanism 5. At this time, the sample placement mechanism 5 is exposed to the outside. After the bidirectional screw 92 rotates, the first sliding plate 96 and the second sliding plate 97 will move away from each other. At this time, the first sliding plate 96 will slide in the first guide groove 98 and move to the bottom of the transfer box 43, forming a barrier for the transfer box 43. The second sliding plate 97 will slide in the second guide groove 99 and move to the top of the turntable 53, and insert the limiting pin 56 into the limiting hole 55 to limit the turntable 53. The user can place the sample bottles into the storage dish 54 in sequence.

[0067] After the sample is stored, the output shaft of the second motor 71 drives the one-way screw 73 to rotate counterclockwise. The one-way screw 73 drives the two-way screw 92 to rotate counterclockwise synchronously through the first pulley 93 and the second pulley 95. When the slider 74 moves in the moving groove 72, it drives the protective cover 13 to move down through the connecting plate 75 and moves the protective cover 13 to the sample placement mechanism 5. The protective cover 13 protects the sample placement mechanism 5, which not only protects the sample in the sample placement mechanism 5, but also prevents dust from entering the sample placement mechanism 5. In addition, the first sliding plate 96 and the second sliding plate 97 will release the limit of the transfer box 43 and the turntable 53 respectively.

[0068] During the test, the extension end of the second electric push rod 62 drives the linkage plate 66 to move upward, and the linkage plate 66 drives the protective cover to move upward through the upper cover plate 15, thereby exposing the touch screen structure 10 to the outside for use. After the protective cover moves upward, the second wedge block 89 squeezes and pushes the first wedge block 85 through the inclined groove, so that after the second wedge block 89 rises to a certain height, it drives the first wedge block 85 to move the linkage rod 83 laterally, inserting one end of the linkage rod 83 into the limiting hole 84, limiting the closed cabinet door 3 in the closed state, so that the closed cabinet door 3 is closed when the user operates the touch screen structure 10, preventing the closed cabinet door 3 from opening when the device is in operation.

[0069] After the test, the telescopic end of the second electric push rod 62 drives the linkage plate 66 to move downward, so that the protective cover covers the touch screen structure 10, providing dust protection for the touch screen structure 10. Furthermore, when the protective cover descends to its original position, the first wedge block 85 is quickly reset under the elastic action of the reset spring 88, thereby releasing the restriction on the closed cabinet door 3.

[0070] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0071] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A dust-proof gas chromatograph characterized by comprising: include: The chromatograph body (1) has a column chamber (2) on it, and a closed cabinet door (3) is hinged on the column chamber (2). The chromatograph body (1) has a receiving cavity (18) and a touch screen structure (10) is provided inside the receiving cavity (18). A protective cover is provided inside the receiving cavity (18) to protect the touch screen structure (10) from dust. The lifting mechanism (6) is installed on the chromatograph body (1) and is used to move the protective cover up and down on the receiving cavity (18); The locking mechanism (8) is installed on the chromatograph body (1) and is used to limit the closed cabinet door (3) in the column chamber (2) after the protective cover is raised and moved. A support column (12) is provided with a protective cover (13) slidably connected to it. A sample placement mechanism (5) for holding the sample is provided below the support column (12). A lifting mechanism (7) for raising and lowering the protective cover (13) is provided on the support column (12). The sample placement mechanism (5) includes a fixed box (51) fixedly connected to the chromatograph body (1). A first motor (52) is installed in the fixed box (51). A turntable (53) is fixedly connected to the output shaft of the first motor (52). A storage dish (54) is fixedly connected to the turntable (53). The lifting mechanism (7) includes a second motor (71) installed on the support column (12) and a moving slot (72) opened on the support column (12). A one-way screw (73) is installed on the output shaft of the second motor (71). The sampling mechanism (4) is set inside the support column (12) and is used to inject and sample the sample placed on the sampling mechanism (5). The sampling mechanism (4) includes a first control cavity (41) opened on the support column (12). A first electric push rod (42) is installed in the first control cavity (41). A transfer box (43) is installed at the telescopic end of the first electric push rod (42). An injection needle (44) is fixedly connected to the bottom surface of the transfer box (43). The bottom end of the injection needle (44) passes through the first control cavity (41) and extends to the top of the storage dish (54). The linkage mechanism (9) is located inside the support column (12) and is linked with the lifting mechanism (7). After the protective cover (13) moves upward, it simultaneously limits the sampling mechanism (4) and the placement mechanism (5). The linkage mechanism (9) includes a third control cavity (91) and a fourth control cavity (94) opened on the support column (12). The support column (12) is provided with a first guide groove (98) and a second guide groove (99). The fourth control cavity (94) is connected to the first control cavity (41) through the first guide groove (98) and the second guide groove (99). The fourth control cavity (94) is rotatably connected with a double... The bidirectional screw (92) is equipped with a second pulley (95), and the unidirectional screw (73) is equipped with a first pulley (93). The first pulley (93) and the second pulley (95) are connected in a driving connection. The bidirectional screw (92) is threaded with a first sliding plate (96) and a second sliding plate (97). One end of the first sliding plate (96) passes through the first guide groove (98) and extends into the first control cavity (41). One end of the second sliding plate (97) passes through the second guide groove (99) and is fixedly connected with a limiting pin (56) that matches the limiting hole (55).

2. The dust-proof gas chromatograph according to claim 1, wherein The protective cover includes a main cover plate (11), two side cover plates (17) are fixedly connected to the main cover plate (11), and an upper cover plate (15) is fixedly connected to the upper surface of the main cover plate (11). A second sealing strip (16) is embedded on the side of the upper cover plate (15) near the chromatograph body (1).

3. The dust-proof gas chromatograph according to claim 2, wherein The lifting mechanism (6) includes a fixed outer shell (61) fixedly connected to the chromatograph body (1), a second electric push rod (62) is installed on the fixed outer shell (61), and a linkage plate (66) is detachably installed on the telescopic end of the second electric push rod (62), and one end of the linkage plate (66) is fixedly connected to the upper cover plate (15).

4. The dust-proof gas chromatograph according to claim 3, wherein The telescopic end of the second electric push rod (62) is fixedly connected to a bearing plate (63), and a threaded column (64) is fixedly connected to the bearing plate (63). A through hole is opened on the linkage plate (66), and the top of the threaded column (64) passes through the through hole and is threadedly connected to a locking nut (65).

5. The dust-proof gas chromatograph according to claim 2, wherein The locking mechanism (8) includes a second control cavity (81) opened on the chromatograph body (1) and a limiting hole (84) opened on the closed cabinet door (3). A support base (82) is fixedly connected in the second control cavity (81). A linkage rod (83) is slidably connected on the support base (82). One end of the linkage rod (83) matches the limiting hole (84). The other end of the linkage rod (83) is fixedly connected to a first wedge block (85). Both ends of the linkage rod (83) are located outside the second control cavity (81).

6. A dust-proof gas chromatograph according to claim 5, wherein A second wedge block (89) is fixedly connected to the side cover plate (17). Both the second wedge block (89) and the first wedge block (85) are provided with inclined grooves. A guide rod (86) is fixedly connected to the first wedge block (85), and one end of the guide rod (86) is inserted into the second control cavity (81). A pressure plate (87) is fixedly connected to the linkage rod (83). A reset spring (88) is sleeved on the linkage rod (83). The two ends of the reset spring (88) abut against the support seat (82) and the pressure plate (87) respectively.

7. The dust-proof gas chromatograph according to claim 1, wherein A one-way screw (73) is rotatably connected to a moving groove (72). A slider (74) is threaded onto the one-way screw (73). One end of the slider (74) is slidably connected to the moving groove (72). The other end of the slider (74) is fixedly connected to a connecting plate (75), and the connecting plate (75) is fixedly connected to a protective cover (13). A first sealing strip (14) is installed on the protective cover (13).

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