Detection device for detecting gas flow by using standard meter method

Abstract

The invention relates to the technical field of analytical instruments and metering detection, in particular to a detection device for detecting gas flow by using a standard meter method.The detection device comprises a calibration detection mechanism, the calibration detection mechanism comprises a first butt-joint pipe and a second butt-joint pipe, and a workbench mechanism is arranged below the position where the first butt-joint pipe and the second butt-joint pipe are close to each other; a lifting table mechanism, an alignment mechanism and a center line mechanism are arranged above the workbench mechanism. Through cooperation of the alignment mechanism, the center line mechanism and the lifting table mechanism, rapid and accurate mechanical centering of a detected flowmeter and a detection pipeline is achieved, flow field sudden change and eddy current caused by installation dislocation are eliminated, and a stable and undisturbed gas flow state is provided for analysis; meanwhile, through a sealing mechanism with a trumpet-shaped section, uniform sealing force is formed under axial compression, rapid sealing without bolt connection is achieved, leakage and pollution of high-purity analysis gas are avoided, and a clean and closed gas path environment is provided for material testing.

Description

Technical Field

[0001] This invention relates to the field of analytical instruments and metrology, specifically to a detection device that uses the standard meter method to detect gas flow rate. Background Technology

[0002] Using the standard meter method for gas flow measurement is a widely adopted and technically mature method for value transfer in the field of flow metering. Its basic principle is as follows: a high-precision standard flow meter and the flow meter under test are connected in series in the same gas path. Under stable flow field conditions, the same gas medium is allowed to flow through both meters sequentially. By comparing the readings or cumulative flow of the two meters within the same time period, the indication error of the flow meter under test can be calculated, thereby achieving calibration, verification, or standardization. To achieve this, a dedicated testing device is usually required. This device is essentially a closed pipeline system, and its core components include: a power unit providing a stable gas source for the system; pressure and flow stabilization equipment to ensure constant gas flow; a high-precision standard flow meter as the measurement reference; and one or more testing stations for installing the flow meter under test. Existing testing equipment typically sets up multiple parallel or series testing stations on the main pipeline. These stations may have different pipe diameters, lengths, and other parameters to accommodate flow meters of different ranges, types, and sizes. The flow meters under test are mechanically connected to the upstream and downstream connecting pipes of the testing stations through flanges at both ends, thus being integrated into the entire testing system.

[0003] The inventors have discovered at least the following problems in the prior art: Firstly, in the installation and alignment process, existing devices generally lack efficient and precise positioning assistance methods. The installation of the flow meter under test mainly relies on the operator's experience and visual observation. After rough positioning using a lifting platform, fine adjustments are made manually using tools such as pry bars to align its flange hole with the flange hole of the connecting pipe. This process is not only time-consuming and labor-intensive, but also makes it difficult to ensure that the axis of the flow meter under test is precisely aligned with the axis of the testing pipe, resulting in a small alignment error. This can then cause steps or abrupt changes in the flow field within the flow channel, forming eddies and distortions in the flow velocity distribution. This directly affects the measurement accuracy of the flow meter. Especially for high-precision metering and material analysis applications that rely on a stable flow field, this flow field disturbance introduced by installation is an unacceptable and unquantifiable source of error.

[0004] Secondly, in terms of sealing connections, existing devices widely adopt the traditional flange-bolt connection method. This method requires manual tightening of multiple bolts one by one, which is cumbersome and time-consuming. More importantly, it is difficult to ensure uniform preload of the bolts, which can easily lead to uneven stress on the sealing gasket, thus creating a risk of leakage under high pressure or after long-term use.

[0005] Therefore, this solution provides a detection device that uses the standard meter method to detect gas flow rate, in order to solve the above problems. Summary of the Invention

[0006] To address the problems of difficulty in aligning the flow meter under test, low efficiency, and insufficient accuracy in existing technologies, as well as the poor sealing and cumbersome operation of traditional flange connections, this invention provides a detection device for detecting gas flow using the standard meter method, thereby solving the aforementioned problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A gas flow detection device using the standard meter method includes a calibration detection mechanism. The calibration detection mechanism includes a suction assembly, a pressure stabilizing assembly, a manifold, a branch pipe, a first connecting pipe, and a second connecting pipe. A worktable mechanism is located below the point where the first and second connecting pipes meet. Above the worktable mechanism are a lifting platform mechanism, an alignment mechanism, and a centerline mechanism. Sealing mechanisms are symmetrically arranged on opposite sides of the first and second connecting pipes, each including a fixed sealing ring and a dynamic sealing ring. The worktable mechanism includes a worktable, a sliding block, and two mounting frames. The lifting platform mechanism includes a lifting plate, two brackets, a support column, and an alignment rod. The alignment mechanism includes a limiting guide plate, vertically distributed pressure plates and a fixed plate, and a height-aligning sleeve on the outer side of the limiting guide plate. The centerline mechanism includes a support plate mounted above the worktable and a centerline sleeve on the outer side of the support plate.

[0008] Preferably, a corrugated gasket is fixedly connected between the fixed sealing ring and the dynamic sealing ring, and the cross-sections of the fixed sealing ring, the corrugated gasket, and the dynamic sealing ring are funnel-shaped.

[0009] Preferably, the bracket is slidably connected above the lifting plate, and rollers are rotatably connected to the inner side of the bracket. The support column is fixedly connected to one side of the lifting plate. A limit groove is opened on one side of the support column, and a limit sleeve is slidably connected inside the limit groove. The alignment rod passes through the limit sleeve and is fixed by bolts.

[0010] Preferably, one end of the alignment rod is connected to a connector, and a spring is provided on one side of the connector, which is fitted with a centerline sleeve.

[0011] Preferably, both the pressure plate and the fixed plate are rotatably connected to auxiliary rollers. The fixed plate is slidably connected to a limiting guide plate. One end of the pressure plate is slidably connected to the limiting guide plate. A slider is fixedly connected to the bottom of the limiting guide plate. The slider is slidably connected to a groove opened on one side of the lifting plate.

[0012] Preferably, the inner side of the limiting guide plate is rotatably connected to a threaded rod, which passes through one end of the threaded connection pressure plate, and the outer side of the limiting guide plate is rotatably connected to a connecting rod two, the rotatable connection point of the connecting rod two being flush with the fixed plate.

[0013] Preferably, one end of the pressure plate is rotatably connected to a connecting rod, and one end of the connecting rod and the second connecting rod are rotatably connected to each other. The alignment sleeve is located at the rotatable connection between the first connecting rod and the second connecting rod, and the alignment sleeve is sleeved around the outer periphery of the alignment rod.

[0014] Preferably, a fixed clamping plate is fixedly connected to one side of the support plate, and a movable clamping plate is provided above the fixed clamping plate. The movable clamping plate is slidably connected to the support plate, and one end of the movable clamping plate is connected to the centerline sleeve and the support plate through a connecting rod assembly.

[0015] Preferably, one end of the first connecting pipe is mounted on the top of the workbench via a bracket, and the second connecting pipe is provided with a mounting seat at the end near the first connecting pipe. The mounting seat is installed between two mounting frame plates, and a bracket guide wheel is provided on the outside of the workbench mechanism. The top of the bracket guide wheel supports the second connecting pipe.

[0016] Preferably, the workbench is equipped with a lifting handwheel inside, the output end of which is connected to the bottom of the lifting plate. A hydraulic cylinder is installed on the outside of the workbench, the output end of which is connected to a sliding block. Two symmetrical slide rails are fixedly connected to the top of the workbench, and the mounting frame is slidably connected above the slide rails. A groove is provided on one side of the workbench, and the sliding block is slidably connected within the groove. Compared with the prior art, the beneficial effects of the present invention are: This invention achieves rapid and precise mechanical alignment between the flow meter under test and the detection pipeline through the coordinated action of the alignment mechanism, centerline mechanism, and lifting platform mechanism. This reduces abrupt changes in the flow field and eddies caused by installation misalignment, providing a stable, undisturbed, and representative gas flow pattern for subsequent accurate analysis of material composition and concentration based on gas flow data. It avoids analytical errors introduced by flow field disturbances and ensures the authenticity and reliability of the analytical results.

[0017] This invention utilizes a unique trumpet-shaped cross-section sealing mechanism, consisting of a fixed sealing ring, a corrugated sealing gasket, and a dynamic sealing ring to form a sealing unit. This structure generates a uniform sealing force under axial compression, achieving rapid sealing without bolts and ensuring absolute sealing throughout the entire working pressure range. This avoids leakage and contamination of high-purity analytical gases, providing a clean and sealed gas path environment for material testing and analysis, ensuring the integrity of analytical samples (materials), and making the analytical data accurate and valid.

[0018] This invention, by setting up a sliding bracket, a V-shaped roller, and an adjustable clamping mechanism, endows the device with strong versatility and adaptability, enabling safe and stable mounting of flow meters of different sizes and specifications. This versatility ensures that flow meters widely used in various gas analysis scenarios can be accurately calibrated on this device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall calibration and testing mechanism of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the middle section; Figure 3 This is a schematic diagram of the structure of the first connecting pipe, the second connecting pipe, and the sealing mechanism of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of section A; Figure 5 This is a schematic diagram of the disassembled structure of the workbench mechanism of the present invention; Figure 6 For the present invention Figure 2 Structural diagram of the central lifting platform mechanism, alignment mechanism, and centerline mechanism; Figure 7 This is a schematic diagram of the disassembled structure of the lifting platform mechanism of the present invention; Figure 8 This is a schematic diagram of the disassembled structure of the alignment mechanism of the present invention.

[0020] In the picture: 1. Calibration and testing mechanism; 11. Suction assembly; 12. Voltage stabilizing assembly; 13. Manifold; 14. Diverter pipe; 15. Connecting pipe one; 16. Connecting pipe two; 17. Mounting base; 2. Bracket guide wheel; 3. Workbench mechanism; 31. Workbench; 32. Lifting handwheel; 33. Slide rail; 34. Groove; 35. Hydraulic cylinder; 36. Sliding block; 37. Mounting frame plate; 4. Sealing mechanism; 41. Fixed sealing ring; 42. Corrugated sealing gasket; 43. Dynamic sealing ring; 5. Lifting platform mechanism; 51. Lifting plate; 52. Bracket; 53. Idler roller; 54. Slide groove; 55. Support column; 56. Limiting groove; 57. Limiting sleeve; 58. Alignment rod; 59. Connecting joint; 591. Spring; 6. Alignment mechanism; 61. Limiting guide plate; 62. Fixed plate; 63. Pressure plate; 64. Auxiliary roller; 65. Threaded rod; 66. Connecting rod one; 67. Connecting rod two; 68. Alignment sleeve; 69. Sliding block; 7. Centerline mechanism; 71. Support plate; 72. Movable clamping plate; 73. Fixed clamping plate; 74. Centerline sleeve; 8. Flow meter to be tested. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example: Please refer to Figure 1-8 The device shown is a gas flow detection device using the standard meter method. It includes a calibration detection mechanism 1. The calibration detection mechanism 1 includes a suction component 11, a pressure stabilizing component 12, a manifold 13, a diverter 14, a first connecting pipe 15 and a second connecting pipe 16. A worktable mechanism 3 is provided below the joint where the first connecting pipe 15 and the second connecting pipe 16 are close to each other. A lifting platform mechanism 5, an alignment mechanism 6 and a centerline mechanism 7 are provided above the worktable mechanism 3. Sealing mechanisms 4 are provided on opposite sides of the first connecting pipe 15 and the second connecting pipe 16, and are symmetrical to each other. The sealing mechanism 4 includes a fixed sealing ring 41 and a dynamic sealing ring 43. The workbench mechanism 3 includes a workbench 31, a sliding block 36, and two mounting frames 37; The lifting platform mechanism 5 includes a lifting plate 51, two brackets 52, a support column 55, and an alignment rod 58; The alignment mechanism 6 includes a limiting guide plate 61, a pressure plate 63 and a fixed plate 62 distributed vertically, and a height-aligning sleeve 68 on the outer side of the limiting guide plate 61. The centerline mechanism 7 includes a support plate 71 mounted above the workbench 31 and a centerline sleeve 74 on the outside of the support plate 71; The suction component 11 delivers the gas from the gas storage tank of the pressure stabilizing component 12 to the manifold 13, and then delivers it to each connecting pipe 15 through the manifold 13 and the branch pipe 14. After the flow meter 8 to be tested is installed, the valve on the connecting pipe 15 is opened and the standard gas flow meter above the connecting pipe 15 and the connecting pipe 2 16 is started, so that the flow meter 8 to be tested can be tested and calibrated. This is the prior art.

[0023] In this embodiment, a corrugated sealing gasket 42 is fixedly connected between the fixed sealing ring 41 and the dynamic sealing ring 43, and the cross-sections of the fixed sealing ring 41, the corrugated sealing gasket 42 and the dynamic sealing ring 43 are funnel-shaped. Among them, the fixed sealing ring 41 and the dynamic sealing ring 43 are both sealing rings, and the diameter of the fixed sealing ring 41 is smaller than that of the dynamic sealing ring 43; the corrugated sealing gasket 42 is a corrugated sealing ring that can be deformed.

[0024] In this embodiment, the bracket 52 is slidably connected above the lifting plate 51, and the inner side of the bracket 52 is rotatably connected with the roller 53. The support column 55 is fixedly connected to one side of the lifting plate 51. A limit groove 56 is opened on one side of the support column 55. A limit sleeve 57 is slidably connected inside the limit groove 56. The alignment rod 58 passes through the limit sleeve 57 and is fixed by bolts. The limiting sleeve 57 is composed of a slider and a sleeve. The sleeve allows the alignment rod 58 to pass through. After passing through, the alignment rod 58 can be positioned by bolts. That is, the alignment rod 58 and the limiting sleeve 57 are rigidly connected and can move up and down synchronously. The idler roller 53 is a V-shaped roller with a large opening.

[0025] In this embodiment, a connector 59 is inserted into one end of the alignment rod 58, and a spring 591 is provided on one side of the connector 59. The connector 59 cooperates with the centerline sleeve 74. The upper end of the connector 59 has a cut surface, which will be pushed aside when it passes the edge of the center sleeve 74, causing the spring 591 to contract. However, when the connector 59 and the center sleeve 74 are aligned, the rebound of the spring 591 will cause the connector 59 to strike the inner wall of the center sleeve 74, thereby producing a sound to remind the user that the pipeline of the flow meter 8 to be tested is aligned with the pipelines of connector 15 and connector 2 16.

[0026] In this embodiment, auxiliary rollers 64 are rotatably connected inside both the pressure plate 63 and the fixed plate 62. The fixed plate 62 is slidably connected to the limiting guide plate 61. One end of the pressure plate 63 is slidably connected to the limiting guide plate 61. A slider 69 is fixedly connected to the bottom of the limiting guide plate 61. The slider 69 is slidably connected in the groove 54 opened on one side of the lifting plate 51. When the pressure plate 63 moves downward, it clamps the pipe part of the flow meter 8 to be tested. In conjunction with the auxiliary roller 64, it can provide auxiliary support for the flow meter 8 to be tested, so as to avoid tilting due to instability of the center of gravity, or even damage to the flow meter 8 to be tested.

[0027] In this embodiment, a threaded rod 65 is rotatably connected to the inner side of the limiting guide plate 61, and the threaded rod 65 passes through one end of the threaded connection pressure plate 63. A connecting rod 67 is rotatably connected to the outer side of the limiting guide plate 61, and the rotatable connection of the connecting rod 67 is flush with the fixed plate 62. The limiting guide plate 61 has a groove at one end of the pressure plate 63, and the top of the threaded rod 65 has a knob for easy rotation.

[0028] In this embodiment, one end of the pressure plate 63 is rotatably connected to a connecting rod 66, and one end of the connecting rod 66 is rotatably connected to the connecting rod 67. The high sleeve 68 is located at the rotatable connection between the connecting rod 66 and the connecting rod 67, and the high sleeve 68 is sleeved around the alignment rod 58. Among them, the lengths of connecting rod 66 and connecting rod 67 are exactly the same, so the high sleeve 68 is always at the midpoint between the pressure plate 63 and the fixed plate 62. Since the pressure plate 63 and the fixed plate 62 clamp the pipe of the flow meter 8 to be tested from above and below, the height of the high sleeve 68 is the center of the pipe of the flow meter 8 to be tested.

[0029] In this embodiment, a fixed clamping plate 73 is fixedly connected to one side of the support plate 71, and a movable clamping plate 72 is provided above the fixed clamping plate 73. The movable clamping plate 72 is slidably connected to the support plate 71, and one end of the movable clamping plate 72 is connected to the centerline sleeve 74 and the support plate 71 through a connecting rod assembly. Among them, the centerline mechanism 7 is another alignment mechanism 6, but the centerline mechanism 7 is used to find the center of the first coupling pipe 15 and the second coupling pipe 16, so that when the coupling pipe 59 is aligned with the centerline sleeve 74, it means that the flow meter to be tested 8 has been aligned with the first coupling pipe 15 and the second coupling pipe 16.

[0030] In this embodiment, one end of the first connecting pipe 15 is mounted on the workbench 31 via a bracket, and the second connecting pipe 16 is provided with a mounting base 17 at the end near the first connecting pipe 15. The mounting base 17 is installed between two mounting frame plates 37. A bracket guide wheel 2 is provided on the outside of the workbench mechanism 3, and the top of the bracket guide wheel 2 supports the second connecting pipe 16. The top of the bracket guide wheel 2 has a tapered guide roller; the bracket guide wheel 2 is used to assist in supporting the connecting pipe 2 16, thereby preventing the connecting pipe 2 16 from bending and facilitating its sliding.

[0031] In this embodiment, a lifting handwheel 32 is provided inside the workbench 31. The output end of the lifting handwheel 32 is connected to the bottom of the lifting plate 51. A hydraulic cylinder 35 is installed on the outside of the workbench 31. The output end of the hydraulic cylinder 35 is connected to a sliding block 36. Two symmetrical slide rails 33 are fixedly connected to the top of the workbench 31. A mounting frame plate 37 is slidably connected above the slide rails 33. A groove 34 is provided on one side of the workbench 31. The sliding block 36 is slidably connected in the groove 34. The workbench 31 contains a worm gear assembly, and the lifting handwheel 32 is the drive handwheel of the worm gear. After rotation, it can drive the lifting plate 51 to move upward. The hydraulic cylinder 35 can be connected to the controller of the calibration and testing mechanism 1 to operate. This allows the sliding block 36 and the mounting frame plate 37 to bring one end of the connecting pipe 16 close to the flow meter 8 to be tested, and then push the flow meter 8 to be tested. With continuous movement, the flow meter 8 is flattened and sealed, and the connection is completed. When one end of the connecting pipe 16 moves and pushes the flow meter 8 to be tested, the alignment mechanism 6 also moves accordingly.

[0032] The working principle of this invention is as follows: Before testing the flow meter 8, the moving clamping plate 72 can be moved down so that it can work with the fixed clamping plate 73 to clamp the connecting pipe 15, thereby making the height of the center sleeve 74 consistent with the center height of the connecting pipe 15. When the flow meter 8 needs to be tested, the corresponding connecting pipe 15 and connecting pipe 2 16 can be selected and placed above the bracket 52 and the fixed plate 62, so that the roller 53 and the fixed plate 62 support the flow meter 8. At this time, the pressure plate 63 can be moved down by manually rotating the threaded rod 65. During the downward movement, the connecting rod 1 66 and connecting rod 2 67 at one end of the pressure plate 63 are rotated and connected to each other, and the height alignment sleeve 68 is inserted at the rotating connection. After the pressure plate 63 moves down to clamp the flow meter 8, the height of the height alignment sleeve 68 will be parallel to the center line of the pipeline of the flow meter 8. Then, when the lifting plate 51 is moved up by rotating the lifting handwheel 32, the height alignment sleeve 68 will be aligned. As rod 58 moves upward, when the connector 59 at one end of rod 58 is at the same height as the centerline sleeve 74, connector 59 will be inserted into the centerline sleeve 74 under the influence of the spring force of spring 591 and make a sound, thus reminding the staff that the pipeline of the flow meter 8 to be tested is connected to the pipelines of connector 15 and connector 2 16. This not only makes it easier for the staff to connect the flow meter 8 to be tested, but also avoids the impact of flow field disturbances introduced by installation errors on the accuracy of the final analysis results. It can reduce eddies or gas stagnation areas caused by abrupt changes and steps in the flow channel, thereby ensuring the stability of the gas flow state through the flow meter 8 to be tested, which is beneficial for subsequent accurate analysis of material composition, concentration, etc. based on gas flow data. After alignment, the hydraulic cylinder 35 can be operated via an external controller, causing the sliding block 36 and mounting frame 37 to move along with the mounting base 17. During the displacement, one end of the connecting pipe 2 16 will continuously approach one end of the flow meter 8 to be tested, and the dynamic sealing ring 43 will contact one end of the flow meter 8. As the flow meter 8 continues to move, it will also move towards the connecting pipe 1 15, which will cause the corrugated sealing gasket 42 to deform. At this time, the fixed sealing ring 41, the corrugated sealing gasket 42, and the dynamic sealing ring 43 will be in the same plane and clamped at the mating surfaces of the connecting pipe 1 15 and the connecting pipe 2 16 with the flow meter 8. This not only improves the sealing performance of the flow meter 8 through which the gas flows, avoiding any minor leakage during testing and preventing inaccurate flow measurement, but also provides a reliable and pollution-free gas path environment for gas flow-based material testing and analysis, ensuring the authenticity and validity of the analysis data. Furthermore, it eliminates the need for flange bolt connections, making operation more convenient.

[0033] The calibration and testing mechanism 1 and its components, the support guide wheel 2, the worktable 31, the lifting handwheel 32, the hydraulic cylinder 35, and the flow meter 8 used in this invention are all existing known electrical devices, and all can be purchased and used directly on the market. Their structure, circuit, and control principle are all existing known technologies. Therefore, the structure, circuit, and control principle of the calibration and testing mechanism 1 and its components, the support guide wheel 2, the worktable 31, the lifting handwheel 32, the hydraulic cylinder 35, and the flow meter 8 are not described in detail here. All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A detection device for detecting gas flow using a standard table method, comprising a calibration detection mechanism (1), characterized in that: The calibration detection mechanism (1) comprises a suction assembly (11), a pressure stabilizing assembly (12), a converging container (13), a shunt pipe (14), a docking pipe I (15) and a docking pipe II (16), the lower part of the docking pipe I (15) and the docking pipe II (16) approaching each other is provided with a workbench mechanism (3), the upper part of the workbench mechanism (3) is provided with a lifting platform mechanism (5), an alignment mechanism (6) and a center line mechanism (7); The opposite sides of the docking pipe I (15) and the docking pipe II (16) are provided with sealing mechanisms (4) and are symmetrical to each other, the sealing mechanism (4) comprises a fixed sealing ring (41) and a movable sealing ring (43); The workbench mechanism (3) comprises a workbench (31), a sliding block (36) and two mounting frame plates (37). The lifting platform mechanism (5) comprises a lifting plate (51), two brackets (52), a support column (55) and an alignment rod (58); The alignment mechanism (6) comprises a limiting guide plate (61), an upper and lower distribution pressing plate (63) and fixed plate (62) and a height matching sleeve (68) outside the limiting guide plate (61); The center line mechanism (7) comprises a support plate (71) mounted above the workbench (31) and a center line sleeve (74) outside the support plate (71).

2. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: The fixed sealing ring (41) and the movable sealing ring (43) are fixedly connected with a corrugated sealing gasket (42), the cross section of the fixed sealing ring (41), the corrugated sealing gasket (42) and the movable sealing ring (43) is horn-shaped.

3. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: The bracket (52) is slidingly connected above the lifting plate (51), the inner side of the bracket (52) is rotatably connected with a supporting roller (53), the support column (55) is fixedly connected to one side of the lifting plate (51), one side of the support column (55) is provided with a limiting groove (56), the limiting groove (56) is slidingly connected with a limiting sleeve (57), and the alignment rod (58) penetrates through the limiting sleeve (57) and is fixed by bolts.

4. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: One end of the alignment rod (58) is inserted with a docking head (59), one side of the docking head (59) is provided with a spring (591), and the docking head (59) matches the center line sleeve (74).

5. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: The inner sides of the pressing plate (63) and the fixed plate (62) are rotatably connected with auxiliary rollers (64), the fixed plate (62) is slidingly connected with the limiting guide plate (61), one end of the pressing plate (63) is slidingly connected with the limiting guide plate (61), and the bottom of the limiting guide plate (61) is fixedly connected with a sliding block (69) slidingly connected in a sliding groove (54) formed in one side of the lifting plate (51).

6. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: The inner side of the limiting guide plate (61) is rotatably connected with a threaded rod (65), one end of the threaded rod (65) penetrates through the pressing plate (63) in threaded connection, the outer side of the limiting guide plate (61) is rotatably connected with a connecting rod II (67), and the connecting rod II (67) is flush with the fixed plate (62) at the rotatable connection.

7. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: One end of the pressing plate (63) is rotatably connected with a connecting rod one (66), the connecting rod one (66) and one end of the connecting rod two (67) are rotatably connected with each other, the pair of high sleeves (68) are located at the rotatable connection of the connecting rod one (66) and the connecting rod two (67), and the pair of high sleeves (68) are sleeved on the periphery of the alignment rod (58).

8. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: One side of the supporting plate (71) is fixedly connected with a fixed clamping plate (73), the upper portion of the fixed clamping plate (73) is provided with a movable clamping plate (72), the movable clamping plate (72) is slidably connected with the supporting plate (71), and one end of the movable clamping plate (72) is connected with the supporting plate (71) through a connecting rod set and a center line sleeve (74).

9. The detection device for detecting gas flow using standard table method according to claim 1, characterized in that: One end of the butt joint pipe one (15) is mounted above the workbench (31) through a support, the butt joint pipe two (16) is provided with a mounting seat (17) near one end of the butt joint pipe one (15), the mounting seat (17) is mounted between the two mounting frame plates (37), the outside of the workbench mechanism (3) is provided with a support guide wheel (2), and the top end of the support guide wheel (2) supports the butt joint pipe two (16).

10. The detection device for detecting gas flow using a standard table method according to claim 1, wherein: The inside of the workbench (31) is provided with a lifting hand wheel (32), the output end of the lifting hand wheel (32) is connected with the bottom of the lifting plate (51), the outer side of the workbench (31) is provided with a hydraulic cylinder (35), the output end of the hydraulic cylinder (35) is connected with a sliding block (36), the upper portion of the workbench (31) is fixedly connected with two symmetrical sliding rails (33), the mounting frame plate (37) is slidably connected above the sliding rails (33), one side of the workbench (31) is provided with a groove (34), and the sliding block (36) is slidably connected in the groove (34).

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