Harmful gas sampling and sample preparation device

Abstract

The invention discloses a harmful gas sampling and sample preparation device, and relates to the technical field of harmful gas sampling, the harmful gas sampling and sample preparation device comprises a gas pipeline, the outer wall of the gas pipeline is fixedly connected with a connecting block, and the harmful gas sampling and sample preparation device further comprises a blocking mechanism, a connecting mechanism and a sampling mechanism. By arranging the sampling mechanism, when a sampling opening and a connecting opening are in butt joint, a movable seat moves and is inserted into the sampling opening, the movable seat makes contact with a partition plate, then a rotating column is rotated, the rotating column rotates to drive a displacement column to move, the displacement column moves to make contact with a stop block, the stop block is pushed to move, and meanwhile, the baffle plate penetrates through the sampling opening; gas in the gas pipeline enters the connecting port through the sampling hole and then enters the sampling barrel; after sampling is completed, the rotating column is rotated to drive the displacement column to move and reset, and at the moment, the baffle is automatically closed by the stop block under the elastic force of the first spring; the device is convenient for preventing gas leakage caused by misoperation when harmful gas in a gas pipeline is sampled.

Description

Technical Field

[0001] The invention relates to the technical field of harmful gas sampling, in particular to a harmful gas sampling and sample preparation device. Background Art

[0002] Harmful gases refer to gases that have adverse effects on the health of humans or animals, or gases that have no effect on the health of humans and animals but make humans or animals feel uncomfortable and affect their comfort, such as NH3, H2S and CO. When analyzing the harmful gas components, it is necessary to sample the gas. However, when sampling the harmful gas in the pipeline, the sampling operation is usually performed through a sampling port opened on the gas transmission pipeline; after the sampling is completed, there will be gas remaining at the sampling port, and careless operation may easily cause leakage of harmful gases. In order to prevent gas leakage during the sampling process, a harmful gas sampling and sample preparation device is provided. Summary of the invention

[0003] The purpose of the present invention is to provide a harmful gas sampling and sample preparation device in order to achieve the purpose of preventing gas leakage during the sampling process.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a harmful gas sampling and sample preparation device, comprising a gas pipeline, the outer wall of the gas pipeline is fixedly connected to a connecting block, the top of the connecting block is provided with a sampling port, a sampling barrel is provided above the sampling port, the bottom of the sampling barrel is fixedly connected to a connecting port, the sampling port is closed by a blocking mechanism, the sampling port and the connecting port are connected by a connecting mechanism, and the sampling barrel performs a sampling operation by the sampling mechanism; the blocking mechanism includes a partition, and the partition is fixedly connected to the inner wall of the sampling port. The top of the fixing frame is fixedly connected to the bottom end of the sampling port, the top of the fixing frame is fixedly connected to the vertical rod, the top of the vertical rod is slidably connected to a blocking block, a circular hole is opened on the outer wall of the partition, the blocking block is used to block the circular hole, a first spring is connected to the outer wall of the vertical rod between the bottom end of the blocking block and the fixing frame, a reinforcement frame is slidably connected to one side of the inner part of the sampling port, one end of the reinforcement frame extends to the inner cavity of the sampling port, the other end of the reinforcement frame contacts with the bottom end of the blocking block, and the outer wall of the reinforcement frame is fixedly connected to an elastic sheet.

[0005] As a further scheme of the present invention: the connecting mechanism includes a lower connecting plate, the lower connecting plate is fixedly connected to the top of the sampling port, the top of the lower connecting plate is provided with a slot, the bottom end of the connecting port is fixedly connected to an upper connecting plate, the bottom end of the upper connecting plate is fixedly connected to an insertion block, the interior of the insertion block is slidably connected to a fixed block extending to the outer wall of the insertion block, a second spring is connected between the fixed block and the insertion block, the interior of the insertion block is located at the top of the fixed block and is slidably connected to an extrusion block, the top of the upper connecting plate is rotatably connected to a rotating block, the bottom end of the rotating block is fixedly connected to a first threaded rod extending to the interior of the extrusion block, the outer wall of the first threaded rod is fixedly connected to a first spur gear, and the interior of the upper connecting plate is located at the outer wall of the first spur gear and is rotatably connected to a gear ring.

[0006] As a further scheme of the present invention: the sampling mechanism includes a movable seat, the movable seat is slidably connected to the inner wall of the connecting port, the inner wall of the connecting port is located above the movable seat and is fixedly connected to a mounting rod, and sliders are fixedly connected on both sides of the movable seat, the interior of the upper connecting plate is located at the inner wall of the gear ring and is rotatably connected to the second spur gear, the top of the second spur gear is fixedly connected to the second threaded rod, the second threaded rod passes through the slider, the outer wall of the connecting port is rotatably connected to a rotating column, one end of the rotating column is fixedly connected to the first bevel gear, the outer wall of the first bevel gear is provided with a second bevel gear, the second bevel gear is rotatably connected to the mounting rod, the bottom end of the second bevel gear is fixedly connected to a square rod, the interior of the movable seat is slidably connected to a displacement column, the outer wall of the displacement column is fixedly connected to a circular plate, the top of the displacement column is provided with a sampling hole, and the interior of the movable seat is rotatably connected to a third threaded rod passing through the circular plate, and the square rod extends to the interior of the third threaded rod.

[0007] As a further solution of the present invention: the outer ring of the gear ring is provided with a first tooth groove, and the first tooth groove is meshed with the first spur gear.

[0008] As a further solution of the present invention: the outer wall of the insert block is in contact with the inner wall of the slot, one end of the fixing block is provided with a first inclined surface, and the bottom end of the extrusion block is in contact with the first inclined surface.

[0009] As a further solution of the present invention: a first threaded hole is formed at the top of the extrusion block, and the first threaded hole matches the first threaded rod.

[0010] As a further solution of the present invention: the inner ring of the gear ring is provided with a second tooth groove, the second tooth groove is meshed with the second spur gear, the outer wall of the slider is provided with a second threaded hole, and the second threaded hole matches the second threaded rod.

[0011] As a further solution of the present invention: the outer wall of the movable seat is in contact with the inner wall of the sampling port, and a second inclined surface is provided at one end of the reinforcement frame located in the inner cavity of the sampling port.

[0012] As a further solution of the present invention: a third threaded hole is opened on the outer wall of the circular plate, and the third threaded hole matches the third threaded rod. The sampling hole is L-shaped, and one end of the sampling hole penetrates the top wall of the displacement column upward, and the other end of the sampling hole penetrates the side wall of the displacement column horizontally, and the first bevel gear is meshed with the second bevel gear.

[0013] As a further solution of the present invention: a square groove is formed at the top end of the third threaded rod, and the inner wall of the square groove fits with the outer wall of the square rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By setting up the sampling mechanism, when the sampling port and the connecting port are docked, the movable seat is displaced and inserted into the sampling port, the movable seat contacts the partition, and then the rotating column is rotated. The rotation of the rotating column drives the displacement column to move, and the displacement column contacts the blocking block, pushing the blocking block to move and pass through the partition at the same time. The gas in the gas pipeline enters the connecting port through the sampling hole and then enters the sampling barrel; when the sampling is completed, the rotating column is rotated to drive the displacement column to move and reset, and at this time the blocking block is automatically closed by the elastic force of the first spring to operate the partition; this device is convenient for sampling harmful gases in the gas pipeline. The sampling process is carried out in a closed state, and the pipeline can be closed in time after sampling to prevent gas leakage caused by improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the sampling port and the connecting port of the present invention; Figure 3 It is a schematic diagram of the internal structure of the sampling port of the present invention; Figure 4 It is a schematic diagram of the internal structure of the connection port of the present invention; Figure 5 It is a schematic diagram of the internal structure of the movable seat of the present invention; Figure 6 It is a schematic diagram of the internal structure of the displacement column of the present invention; Figure 7 It is a schematic diagram of the internal structure of the third threaded rod of the present invention.

[0016] In the figure: 1, gas pipeline; 2, connecting block; 3, sampling port; 4, sampling barrel; 5, connecting port; 6, blocking mechanism; 601, partition; 602, fixing frame; 603, vertical rod; 604, blocking block; 605, first spring; 606, reinforcement frame; 607, elastic sheet; 7, connecting mechanism; 701, lower connecting plate; 702, slot; 703, upper connecting plate; 704, plug block; 705, fixing block; 706, second spring; 707, rotating Moving block; 708, first threaded rod; 709, extrusion block; 710, first spur gear; 711, gear ring; 8, sampling mechanism; 801, movable seat; 802, slider; 803, second threaded rod; 804, second spur gear; 805, mounting rod; 806, rotating column; 807, first bevel gear; 808, second bevel gear; 809, square rod; 810, third threaded rod; 811, displacement column; 812, circular plate; 813, sampling hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0019] See also Figures 1 to 7In an embodiment of the present invention, a harmful gas sampling and preparing device includes a gas pipeline 1, a connecting block 2 is fixedly connected to the outer wall of the gas pipeline 1, a sampling port 3 is arranged at the top of the connecting block 2, a sampling barrel 4 is arranged above the sampling port 3, a connecting port 5 is fixedly connected to the bottom end of the sampling barrel 4, the sampling port 3 is closed by a blocking mechanism 6, the sampling port 3 and the connecting port 5 are connected by a connecting mechanism 7, the sampling barrel 4 is sampled by a sampling mechanism 8, the blocking mechanism 6 includes a partition 601, the partition 601 is fixedly connected to the inner wall of the sampling port 3, and the bottom end of the sampling port 3 is fixedly connected to a fixing frame 602, the top of the fixed frame 602 is fixedly connected with a vertical rod 603, the top of the vertical rod 603 is slidably connected with a blocking block 604, the outer wall of the partition 601 is provided with a circular hole, the blocking block 604 is used to block the circular hole, the bottom end of the blocking block 604 and the outer wall of the vertical rod 603 between the fixed frame 602 are connected with a first spring 605, the inner side of the sampling port 3 is slidably connected with a reinforcement frame 606, one end of the reinforcement frame 606 extends to the inner cavity of the sampling port 3, the other end of the reinforcement frame 606 contacts with the bottom end of the blocking block 604, and the outer wall of the reinforcement frame 606 is fixedly connected with an elastic sheet 607.

[0020] In this embodiment: the blocking block 604 is acted upon by the elastic force of the first spring 605 to block the circular hole on the partition 601, thereby closing the partition 601. At the same time, the reinforcement frame 606 contacts the bottom end of the blocking block 604 to prevent the blocking block 604 from moving downward, thereby causing the partition 601 to be opened and the sampling port 3 to be closed.

[0021] Please refer to Figures 2 to 4 The connecting mechanism 7 includes a lower connecting plate 701, which is fixedly connected to the top of the sampling port 3. A slot 702 is provided at the top of the lower connecting plate 701. The bottom end of the connecting port 5 is fixedly connected to an upper connecting plate 703. The bottom end of the upper connecting plate 703 is fixedly connected to an insert block 704. The inside of the insert block 704 is slidably connected to a fixed block 705 extending to the outer wall of the insert block 704. A second spring 706 is connected between the fixed block 705 and the insert block 704. The inside of the insert block 704 is located at the top of the fixed block 705 and is slidably connected to an extrusion block 709. The top of the upper connecting plate 703 is rotatably connected to a rotating block 707. The bottom end of the rotating block 707 is fixedly connected to a first threaded rod 708 extending to the inside of the extrusion block 709. The outer wall of the first threaded rod 708 is fixedly connected to a first spur gear 710. The inside of the upper connecting plate 703 is located at the outer wall of the first spur gear 710 and is rotatably connected to a gear ring 711.

[0022] In this embodiment: when one first spur gear 710 rotates, the rotation of the first spur gear 710 drives the gear ring 711 to rotate, and the rotation of the gear ring 711 drives the other first spur gear 710 to rotate synchronously, thereby driving the two first threaded rods 708 to rotate synchronously.

[0023] When docking the sampling port 3 and the connecting port 5, align the lower connecting plate 701 and the upper connecting plate 703, insert the insert block 704 into the slot 702, and then rotate one of the rotating blocks 707. The rotation of the rotating block 707 drives the first threaded rod 708 to rotate, and the rotation of the first threaded rod 708 drives the extrusion block 709 to move. The displacement of the extrusion block 709 pushes the fixed block 705 out of the insert block 704, causing the second spring 706 to be squeezed. The fixed block 705 contacts the bottom end of the lower connecting plate 701, thereby fixing the lower connecting plate 701 and the upper connecting plate 703, and then the sampling port 3 and the connecting port 5 are docked.

[0024] Please refer to Figures 4 to 7 The sampling mechanism 8 includes a movable seat 801, which is slidably connected to the inner wall of the connecting port 5. The inner wall of the connecting port 5 is located above the movable seat 801 and is fixedly connected to a mounting rod 805. Slide blocks 802 are fixedly connected to both sides of the movable seat 801. The inner wall of the upper connecting plate 703 is located inside the inner wall of the gear ring 711 and is rotatably connected to a second spur gear 804. The top of the second spur gear 804 is fixedly connected to a second threaded rod 803. The second threaded rod 803 runs through the slide block 802. The outer wall of the connecting port 5 is rotatably connected to a rotating column 806. One end of the rotating column 806 is fixed It is connected to a first bevel gear 807, a second bevel gear 808 is provided on the outer wall of the first bevel gear 807, the second bevel gear 808 is rotatably connected to the mounting rod 805, a square rod 809 is fixedly connected to the bottom end of the second bevel gear 808, a displacement column 811 is slidably connected to the inside of the movable seat 801, a circular plate 812 is fixedly connected to the outer wall of the displacement column 811, a sampling hole 813 is provided on the top of the displacement column 811, a third threaded rod 810 which passes through the circular plate 812 is rotatably connected to the inside of the movable seat 801, and the square rod 809 extends to the inside of the third threaded rod 810.

[0025] In this embodiment: when the upper connecting plate 703 and the lower connecting plate 701 are fixed, the first spur gear 710 rotates to drive the gear ring 711 to rotate, the gear ring 711 rotates to drive the second spur gear 804 to rotate, the second spur gear 804 rotates to drive the second threaded rod 803 to rotate, the second threaded rod 803 rotates to drive the slider 802 to move, the displacement of the slider 802 drives the movable seat 801 to move, the movable seat 801 moves and is inserted into the sampling port 3, when the upper connecting plate 703 and the lower connecting plate 701 are fixed, the movable seat 801 contacts the partition 601; during this process, the movable seat 801 contacts the reinforcement frame 606, pushing the reinforcement frame 606 to move, causing compression on the elastic sheet 607, the reinforcement frame 606 is separated from the blocking block 604, and the fixation of the blocking block 604 is cancelled.

[0026] Then, the rotating column 806 is rotated, and the rotation of the rotating column 806 drives the first bevel gear 807 to rotate, and the rotation of the first bevel gear 807 drives the second bevel gear 808 to rotate, and the rotation of the second bevel gear 808 drives the square rod 809 to rotate, and the rotation of the square rod 809 drives the third threaded rod 810 to rotate, and the rotation of the third threaded rod 810 drives the circular plate 812 to displace, and the displacement of the circular plate 812 drives the displacement column 811 to displace, and the displacement column 811 displaces and contacts the blocking block 604, pushing the blocking block 604 to move, causing compression on the first spring 605, and at the same time, the displacement column 811 passes through the partition 601, and the gas in the gas pipeline 1 enters the connecting port 5 through the sampling hole 813, and then enters the sampling barrel 4.

[0027] When sampling is completed, the rotating column 806 is rotated in the opposite direction to drive the displacement column 811 to move and reset. At this time, the blocking block 604 is automatically closed by the elastic force of the first spring 605 on the partition 601. When the sampling port 3 and the connecting port 5 are separated, the movable seat 801 automatically moves out of the sampling port 3, and the reinforcement frame 606 is reset by the elastic force of the elastic sheet 607 to contact the blocking block 604, and the blocking block 604 is reinforced; and the displacement column 811 resets upward, and its sampling hole 813 is blocked by the side wall of the movable seat 801, and the sampled gas can be sealed and stored in the sampling barrel 4 for subsequent detection. This structure is convenient for sampling harmful gases in the gas pipeline 1. The sampling process is carried out in a closed state, and the pipeline can be closed in time after sampling to prevent gas leakage caused by improper operation.

[0028] Please refer to Figure 4 The outer ring of the gear ring 711 is provided with a first tooth groove, and the first tooth groove is meshed with the first spur gear 710 .

[0029] In this embodiment: when one first spur gear 710 rotates, the rotation of the first spur gear 710 drives the gear ring 711 to rotate, and the rotation of the gear ring 711 drives the other first spur gear 710 to rotate synchronously, thereby driving the two first threaded rods 708 to rotate synchronously.

[0030] Please refer to Figures 2 to 4 The outer wall of the insert block 704 fits with the inner wall of the slot 702, a first inclined surface is provided at one end of the fixing block 705, the bottom end of the extrusion block 709 contacts the first inclined surface, a first threaded hole is provided at the top end of the extrusion block 709, and the first threaded hole matches the first threaded rod 708.

[0031] In this embodiment: the lower connecting plate 701 and the upper connecting plate 703 are aligned, the insert block 704 is inserted into the slot 702, and then the rotating block 707 is rotated. The rotating block 707 rotates to drive the first threaded rod 708 to rotate. The first threaded rod 708 rotates to drive the extrusion block 709 to move. The displacement of the extrusion block 709 pushes the fixed block 705 out of the insert block 704, causing the second spring 706 to be squeezed. The fixed block 705 contacts the bottom end of the lower connecting plate 701, thereby fixing the lower connecting plate 701 and the upper connecting plate 703, and then the sampling port 3 and the connecting port 5 are docked.

[0032] Please refer to Figures 4 to 7 The inner ring of the gear ring 711 is provided with a second tooth groove, which is meshed with the second spur gear 804. The outer wall of the slider 802 is provided with a second threaded hole, which matches the second threaded rod 803. The outer wall of the movable seat 801 is in contact with the inner wall of the sampling port 3. The reinforcement frame 606 is located at one end of the inner cavity of the sampling port 3 and is provided with a second inclined surface.

[0033] In this embodiment: the first spur gear 710 rotates to drive the gear ring 711 to rotate, the gear ring 711 rotates to drive the second spur gear 804 to rotate, the second spur gear 804 rotates to drive the second threaded rod 803 to rotate, the second threaded rod 803 rotates to drive the slider 802 to move, the displacement of the slider 802 drives the movable seat 801 to move, the movable seat 801 moves and is inserted into the sampling port 3, when the upper connecting plate 703 and the lower connecting plate 701 are fixed, the movable seat 801 contacts the partition 601, during this process the movable seat 801 contacts the reinforcement frame 606, pushing the reinforcement frame 606 to move, squeezing the elastic sheet 607, the reinforcement frame 606 is separated from the blocking block 604, and the fixing of the blocking block 604 is cancelled.

[0034] Please refer to Figures 4 to 7 A third threaded hole is provided on the outer wall of the circular plate 812, and the third threaded hole matches the third threaded rod 810. The sampling hole 813 is L-shaped. One end of the sampling hole 813 penetrates the top wall of the displacement column 811 upward, and the other end of the sampling hole 813 penetrates the side wall of the displacement column 811 horizontally. The first bevel gear 807 is meshed with the second bevel gear 808. A square groove is provided on the top of the third threaded rod 810, and the inner wall of the square groove fits with the outer wall of the square rod 809.

[0035] In this embodiment: the rotating column 806 is rotated, and the rotation of the rotating column 806 drives the first bevel gear 807 to rotate, the rotation of the first bevel gear 807 drives the second bevel gear 808 to rotate, the rotation of the second bevel gear 808 drives the square rod 809 to rotate, the rotation of the square rod 809 drives the third threaded rod 810 to rotate, the rotation of the third threaded rod 810 drives the circular plate 812 to displace, the displacement of the circular plate 812 drives the displacement column 811 to displace, the displacement column 811 displaces and contacts the blocking block 604, pushing the blocking block 604 to move, squeezing the first spring 605, and at the same time passing through the partition 601, the gas in the gas pipeline 1 enters the connecting port 5 through the sampling hole 813, and then enters the sampling barrel 4.

[0036] It should be pointed out that there is a sealed connection between the movable seat 801 and the inner wall of the connecting port 5. Therefore, in the initial state, since the movable seat 801 is located at the upper part of the connecting port 5, as the movable seat 801 moves downward, a negative pressure state is present in the sampling barrel 4 until the displacement column 811 passes through the partition 601, so that the two ends of the sampling hole 813 are respectively connected to the sampling barrel 4 and the sampling port 3. At this time, the gas in the gas pipeline 1 can enter the sampling barrel 4 through the sampling hole 813 to complete the sampling operation.

[0037] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A harmful gas sampling and preparation device, comprising a gas pipeline (1), the outer wall of the gas pipeline (1) is fixedly connected to a connection block (2), the top of the connection block (2) is provided with a sampling port (3), a sampling barrel (4) is provided above the sampling port (3), and the bottom of the sampling barrel (4) is fixedly connected to a connection port (5), characterized in that: The sampling port (3) is closed by a blocking mechanism (6); the sampling port (3) and the connecting port (5) are connected by a connecting mechanism (7); the sampling barrel (4) is sampled by a sampling mechanism (8); the blocking mechanism (6) comprises a partition (601); the partition (601) is fixedly connected to the inner wall of the sampling port (3); the bottom end of the sampling port (3) is fixedly connected to a fixing frame (602); the top end of the fixing frame (602) is fixedly connected to a vertical rod (603); the top end of the vertical rod (603) is slidably connected to a blocking block (604); A circular hole is formed on the outer wall of the partition (601), and the blocking block (604) is used to cover the circular hole. A first spring (605) is connected to the outer wall of the vertical rod (603) between the bottom end of the blocking block (604) and the fixing frame (602). A reinforcement frame (606) is slidably connected to one side of the interior of the sampling port (3). One end of the reinforcement frame (606) extends to the inner cavity of the sampling port (3), and the other end of the reinforcement frame (606) contacts the bottom end of the blocking block (604). An elastic sheet (607) is fixedly connected to the outer wall of the reinforcement frame (606).

2. A harmful gas sampling and sample preparation device according to claim 1, characterized in that: The connecting mechanism (7) comprises a lower connecting plate (701), the lower connecting plate (701) being fixedly connected to the top of the sampling port (3), a slot (702) being provided at the top of the lower connecting plate (701), an upper connecting plate (703) being fixedly connected to the bottom of the connecting port (5), an insert block (704) being fixedly connected to the bottom of the upper connecting plate (703), a fixed block (705) extending to the outer wall of the insert block (704) being slidably connected inside the insert block (704), a second connecting block (705) being connected to the insert block (704) The spring (706) is provided in the insert block (704), the top of the fixed block (705) is slidably connected to an extrusion block (709), the top of the upper connecting plate (703) is rotatably connected to a rotating block (707), the bottom of the rotating block (707) is fixedly connected to a first threaded rod (708) extending to the inside of the extrusion block (709), the outer wall of the first threaded rod (708) is fixedly connected to a first spur gear (710), and the inner part of the upper connecting plate (703) is rotatably connected to an outer wall of the first spur gear (710).

3. A harmful gas sampling and sample preparation device according to claim 2, characterized in that: The sampling mechanism (8) comprises a movable seat (801), the movable seat (801) is slidably connected to the inner wall of the connecting port (5), the inner wall of the connecting port (5) is located above the movable seat (801) and is fixedly connected to a mounting rod (805), both sides of the movable seat (801) are fixedly connected to sliders (802), the interior of the upper connecting plate (703) is located on the inner wall of the gear ring (711) and is rotatably connected to a second spur gear (804), the top end of the second spur gear (804) is fixedly connected to a second threaded rod (803), the second threaded rod (803) passes through the slider (802), the outer wall of the connecting port (5) is rotatably connected to a rotating column (806), one side of the rotating column (806) The movable seat (801) is fixedly connected to a first bevel gear (807) at its end, a second bevel gear (808) is provided on an outer wall of the first bevel gear (807), the second bevel gear (808) is rotatably connected to the mounting rod (805), a square rod (809) is fixedly connected to the bottom end of the second bevel gear (808), a displacement column (811) is slidably connected inside the movable seat (801), a circular plate (812) is fixedly connected to the outer wall of the displacement column (811), a sampling hole (813) is provided on the top of the displacement column (811), a third threaded rod (810) penetrating the circular plate (812) is rotatably connected inside the movable seat (801), and the square rod (809) extends to the inside of the third threaded rod (810).

4. A harmful gas sampling and sample preparation device according to claim 2, characterized in that: The outer ring of the gear ring (711) is provided with a first tooth groove, and the first tooth groove is meshed with the first spur gear (710).

5. A harmful gas sampling and sample preparation device according to claim 2, characterized in that: The outer wall of the insert block (704) fits in with the inner wall of the slot (702); one end of the fixing block (705) is provided with a first inclined surface; and the bottom end of the extrusion block (709) contacts the first inclined surface.

6. A harmful gas sampling and sample preparation device according to claim 2, characterized in that: A first threaded hole is formed at the top of the extrusion block (709), and the first threaded hole matches the first threaded rod (708).

7. A harmful gas sampling and sample preparation device according to claim 3, characterized in that: The inner ring of the gear ring (711) is provided with a second tooth groove, the second tooth groove meshes with the second spur gear (804), and the outer wall of the slider (802) is provided with a second threaded hole, the second threaded hole matches the second threaded rod (803).

8. A harmful gas sampling and sample preparation device according to claim 3, characterized in that: The outer wall of the movable seat (801) fits the inner wall of the sampling port (3), and a second inclined surface is provided at one end of the reinforcement frame (606) located in the inner cavity of the sampling port (3).

9. A harmful gas sampling and sample preparation device according to claim 3, characterized in that: A third threaded hole is formed on the outer wall of the circular plate (812), and the third threaded hole matches the third threaded rod (810). The sampling hole (813) is L-shaped, and one end of the sampling hole (813) penetrates the top wall of the displacement column (811) upwards, and the other end of the sampling hole (813) penetrates the side wall of the displacement column (811) horizontally. The first bevel gear (807) is meshed with the second bevel gear (808).

10. A harmful gas sampling and sample preparation device according to claim 3, characterized in that: A square groove is formed at the top of the third threaded rod (810), and the inner wall of the square groove fits with the outer wall of the square rod (809).

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