Gas leakage detection device and detection method thereof

Abstract

The invention belongs to the technical field of gas leakage detection, and particularly relates to a gas leakage detection device and a detection method thereof. The pipeline detection problem that three-way joints, flange joints and the like are difficult to detect is effectively solved. Comprising a body unit, the body unit comprises an installation main plate, and two sides of the installation main plate are respectively provided with a supporting unit which is used for supporting the detection device and can move on a to-be-detected pipeline. A buckling unit is arranged at the bottom of the mounting main board, the buckling unit comprises an upper combination body and a lower combination body, the upper combination body and the lower combination body are both of a shell-shaped structure and are detachably connected through a connecting piece, and a sealed cavity is formed after the upper combination body and the lower combination body are buckled and connected; a hole channel for a pipeline to pass through is formed in each of the two ends of the sealed cavity; during use, a to-be-detected pipeline is clamped between the upper combination body and the lower combination body, and the two ends of the to-be-detected pipeline penetrate out of the two hole channels respectively.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas leakage detection, and in particular relates to a gas leakage detection device and a detection method thereof. Background Art

[0002] Steel production enterprises need to use a variety of gases in the production and processing process. These gases play an important role in different process links; many of them are combustible and toxic gases. For example: oxygen used for blowing in the converter steelmaking process, hydrogen used as a reducing agent and for direct reduction of iron ore, carbon monoxide used in heating and combustion processes, and carbon monoxide that can be used for reduction reactions in certain metallurgical processes.

[0003] Steel mills use a variety of gases, each of which plays a unique role in different process links. For hazardous gases, gas leaks are very dangerous. In steel smelting production, gas source leaks may bring serious safety hazards and economic losses, affecting production efficiency and environmental safety. For example, after hydrogen, carbon monoxide and other flammable gases leak, they are prone to explosions when exposed to open flames or high temperatures, causing serious casualties and property losses. If toxic gases leak, it may cause poisoning or even death, and the production line will be forced to stop, affecting production progress. Leakage will also cause a large amount of gas loss, increase energy consumption, and increase production costs.

[0004] In the process of pipeline transportation, leak detection is an important means to prevent leaks. For gas pipelines of different diameters, especially those with flange joints and tee joints, these places are often high-incidence points of leakage. However, for these key leak-prone parts, the existing detection methods lack effective detection. In order to meet the detection needs of these locations, it is urgent to design a detection device that can effectively complete the leak detection work along the entire pipeline. Summary of the invention

[0005] The present invention aims at solving the defects in the prior art and provides a gas leakage detection device and a detection method thereof.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: the gas leakage detection device includes: a main body unit, the main body unit includes a mounting main board, and a support unit is installed on each side of the mounting main board for supporting the detection device and enabling it to move on the pipeline to be detected.

[0007] A snap-fit ​​unit is provided at the bottom of the mounting main board, and the snap-fit ​​unit includes an upper body and a lower body. Both the upper body and the lower body are shell-like structures, and the two are detachably connected by a connecting piece, and a sealed chamber is formed after being snapped together; and a channel for the passage of a pipeline is formed at each end of the sealed chamber; when in use, the upper body and the lower body clamp the pipeline to be detected between the two, and the two ends of the pipeline to be detected pass through the two channels respectively.

[0008] The side wall of the upper body is provided with an air inlet, and the side wall of the lower body is provided with an air outlet.

[0009] Furthermore, a rubber sleeve is provided on the top of the upper body and is connected thereto; when there is a leak in the three-way joint of the pipeline to be detected, the rubber sleeve is used to accommodate the three-way joint; and a central hole is provided on the mounting main board to reserve space for the rubber sleeve.

[0010] Furthermore, a width-adjusting unit for adapting to different diameters of pipelines to be inspected is disposed on both sides of the main body unit, and an embracing unit is connected to each end of each width-adjusting unit. The four embracing units are used to fix the detection device on the pipeline to be inspected.

[0011] Furthermore, the left and right sides of the mounting mainboard of the main body unit are both arranged in a concave shape, and the concave side is also provided with a through guide groove for installing the width adjustment unit; a handle is also provided on the top of the mounting mainboard to facilitate personnel operation and transportation; a cover plate for shielding the width adjustment mechanism is provided on each side of the top of the mounting mainboard, and the cover plate is hinged to the mounting mainboard.

[0012] Furthermore, the width-adjusting unit comprises a sliding assembly, two left and right arms hinged to the sliding assembly, and a guide bar hinged to the arms; and each arm corresponds to a guide bar.

[0013] Among them, the sliding assembly includes a U-shaped guide rail, a width-adjusting slider located in the U-shaped guide rail, and the U-shaped guide rail is provided with at least two gear holes along the length direction. The width-adjusting slider is slidably connected to the U-shaped guide rail and is locked in place by a locking pin. The locking pin passes through the width-adjusting slider and is inserted into the corresponding gear hole to achieve the positioning of the width-adjusting slider.

[0014] The two arms clamp the U-shaped guide rail in the middle, and the first end of each arm is hinged to the width-adjusting slider, and the second end of each arm is hinged to the corresponding guide bar; the U-shaped guide rail is perpendicular to the guide bar, and the position of the width-adjusting slider on the U-shaped guide rail is adjusted to achieve the purpose of driving the guide bar to move forward and backward along the guide groove, thereby realizing width adjustment.

[0015] Furthermore, the holding unit includes a linear electric cylinder. Among the multiple linear electric cylinders, two linear electric cylinders are formed in a group, corresponding to a width adjustment unit; a linear electric cylinder in each group of linear electric cylinders corresponds to a guide bar of the width adjustment unit; the cylinder base of the linear electric cylinder is fixedly connected to the end of the guide bar of the corresponding width adjustment unit, the linear electric cylinder is installed downward, and a support plate is fixedly connected to the end of the cylinder rod of the linear electric cylinder, one side of the top of the support plate is fixedly connected to the cylinder rod, and an upward locking pin is installed on the other side of the top of the support plate.

[0016] Furthermore, the support unit includes a support base and a guide shaft connected to the main body unit. Specifically, the support base is connected to a mounting mainboard of the main body unit.

[0017] A lifting motor is installed on the outer wall of the support seat. After one end of the guide shaft passes through the guide hole of the support seat, the protruding end is connected to the U-shaped bracket, and the shape of the guide hole is adapted to the guide shaft for axial limitation of the guide shaft.

[0018] A travel wheel is installed on the U-shaped bracket; a gear is arranged in the support seat, the output shaft of the lifting motor extends into the support seat, and the output shaft is connected to the gear to drive the gear to rotate; the gear is meshed and connected with the guide shaft; the rotation of the gear drives the guide shaft to move up and down along the guide hole, driving the travel wheel to lift up and down.

[0019] Furthermore, the air inlet of the snap-fit ​​unit is connected to an air pump unit, which is used to fill air or nitrogen into the sealed chamber through the air inlet; the air outlet is connected to a detection control unit, which is used to analyze the gas composition discharged from the air outlet to determine whether there is a leak.

[0020] Furthermore, a cylindrical magnetic buckle is provided on the top of the upper body, and a positioning magnetic suction head is provided on the bottom of the main body unit. The cylindrical magnetic buckle is attracted to the positioning magnetic suction head to realize the positioning and fixing of the buckling unit on the main body unit.

[0021] A positioning pin is provided at the bottom of the upper body, and a positioning hole corresponding to the positioning pin is provided at the top of the lower body. When the upper body and the lower body are buckled together, the positioning pin is located in the positioning hole to achieve accurate buckling between the upper and lower bodies; and after buckling, the upper and lower bodies are sealed by a sealing strip.

[0022] The bottom of the lower body is provided with a positioning pin hole, which is matched with the locking pin of the engaging unit. During detection, the locking pin is stuck in the corresponding positioning pin hole to enable the engaging unit to be tightly attached to the pipeline to be detected.

[0023] The gas leakage detection method is based on the above-mentioned gas leakage detection device, and the detection method comprises the steps of:

[0024] S1. The snap-fit ​​unit has holes of different specifications. Select the matching snap-fit ​​unit according to the diameter of the pipe to be tested;

[0025] S2. The main unit is supported above the pipeline to be inspected by the walking wheels on the support unit, and the detection device is dragged along the pipeline to the position to be inspected by using the handle on the installation main board;

[0026] S3, controlling the lifting motor in the support unit to drive the guide shaft to move up and down, so that the upper assembly fits the surface of the pipeline to be inspected;

[0027] S4, manually buckle the lower assembly with the upper assembly from below the pipeline to form a sealed chamber. At this time, the upper assembly and the lower assembly are accurately aligned through the positioning pins and positioning holes and are sealed by the sealing strip;

[0028] S5, control the linear electric cylinder in the engaging unit to insert the locking pin into the positioning pin hole at the bottom of the lower engaging body, thereby fixing the engaging unit on the pipeline to be inspected;

[0029] S6. Control the lifting motor of the support unit again to make the traveling wheels separate from the pipeline, ensuring that the entire detection device is firmly held on the pipeline;

[0030] S7, start the air pump unit, and fill the sealed chamber with air or nitrogen through the air inlet until the original gas is completely exhausted;

[0031] S8, the detection control unit analyzes the gas composition discharged from the gas outlet to determine whether there is a leak;

[0032] S9, after completing the inspection of a certain section of the pipeline, control the linear electric cylinder to release the lock pin, so that the lower assembly is separated from the pipeline, and at the same time control the lifting motor of the support unit to make the walking wheel support above the pipeline again, so as to move the inspection device to the next inspection position;

[0033] S10. Repeat the above steps until all pipeline sections that need to be inspected are completed.

[0034] Compared with the prior art, the present invention has beneficial effects.

[0035] The gas leakage detection device of the present invention uses an upper body and a lower body to seal the delivery pipeline to form a sealed cavity, which can detect the gas content of the flanged pipeline to detect pipeline leakage. A rubber sleeve is installed on the upper end of the upper body of the gas leakage detection device, which can achieve the purpose of leak detection at the position of the three-way joint of the pipeline, and effectively solves the problem of difficult detection of three-way joints, flange joints, etc. At the same time, width adjustment units are installed at both ends of the gas leakage detection device, and upper and lower bodies of different widths can be used according to the detection of pipelines of different diameters and models, in order to adjust the width of the upper and lower bodies of different sizes to adapt to the sizes of the upper and lower bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

[0037] Figure 1 The present invention is a three-dimensional gas leakage detection device and a detection method thereof. Figure 1 .

[0038] Figure 2 The present invention is a three-dimensional gas leakage detection device and a detection method thereof. Figure 2 .

[0039] Figure 3 It is a three-dimensional view of a snap-fit ​​unit of a gas leakage detection device and a detection method thereof in an embodiment.

[0040] Figure 4 It is a front view of a snap-fit ​​unit of a gas leakage detection device and a detection method thereof in an embodiment.

[0041] Figure 5 It is a cross-sectional view of a snap-fit ​​unit of a gas leakage detection device and a detection method thereof snap-fitted onto a pipeline in an embodiment.

[0042] Figure 6 It is a combined three-dimensional view of the gas leakage detection device and the detection method thereof in the embodiment.

[0043] Figure 7 It is a combined three-dimensional view of the gas leakage detection device and the detection method thereof according to the embodiment.

[0044] Figure 8 Schematic diagram of a main unit of a gas leakage detection device and a detection method thereof according to an embodiment.

[0045] Figure 9-11 It is a schematic diagram of the connection between the main unit of the gas leakage detection device and the detection method thereof in the embodiment and other units.

[0046] Fig.12 The present invention is a gas leakage detection device and a detection method thereof. The width adjustment unit three-dimensional vision Figure 1 .

[0047] Fig.13 The present invention is a gas leakage detection device and a detection method thereof. The width adjustment unit three-dimensional vision Figure 2 .

[0048] Fig.14 It is a three-dimensional view of a support unit of a gas leakage detection device and a detection method thereof according to an embodiment.

[0049] Fig.15 It is a front view of a supporting unit of a gas leakage detection device and a detection method thereof according to an embodiment.

[0050] Fig.16It is a schematic diagram of the connection between the air inlet of the detection control unit and the air outlet of the snap-fit ​​unit in the embodiment.

[0051] In the figure, 1, main unit; 2, detection control unit; 3, air pump unit; 4, support unit; 5, width adjustment unit; 6, embracing unit; 7, buckling unit; 8, pipeline to be detected; 101, installation main board; 102, center hole; 103, handle; 104, cover plate; 105, guide groove; 106, positioning magnetic suction head; 107, air pipe; 401, support seat; 402, gear; 403, guide shaft; 404, tooth; 405, lifting motor; 406, walking wheel; 407, U-shaped bracket; 408, support shaft; 409, guide hole; 501, Guide strip; 502, support arm; 503, U-shaped guide rail; 504, gear hole; 505, locking pin; 506, pin shaft; 507, earring; 508, width adjustment slider; 601, linear electric cylinder; 602, support plate; 603, locking pin; 701, upper body; 702, lower body; 703, magnetic buckle; 704, positioning pin hole (locking pin hole); 705, rubber sleeve; 706, air inlet hole; 707, air outlet hole; 708, positioning pin; 709, positioning hole; 710, sealing strip; 711, semi-arc mouth; 801, three-way joint; 802, flange joint. DETAILED DESCRIPTION

[0052] In order to better understand the technical solution of the present invention, a specific implementation scheme is provided as follows; and the following scheme is only for illustration.

[0053] like Figure 1-16As shown, the gas leakage detection device of the present invention comprises: a main body unit 1, the main body unit 1 comprises a mounting main board 101, and a support unit 4 is installed on each side of the mounting main board 101, which is used to support the detection device and can move on the pipeline 8 to be detected. A buckle unit 7 is arranged at the bottom of the mounting main board 101, and the buckle unit 7 comprises an upper body 701 and a lower body 702, the upper body 701 and the lower body 702 are both shell-like structures, and the two are detachably connected by a connector, and a sealed chamber is formed after being buckled and connected; and a channel for the pipeline 8 to pass through is formed at each end of the sealed chamber; that is: the upper body 701 and the lower body 702 are both provided with a semi-arc opening 711, and the size of the semi-arc opening is designed to match a pipeline of a specific diameter so that it can fit tightly on the surface of the pipeline. When in use, the upper body 701 and the lower body 702 clamp the pipeline 8 to be detected between the two, and the two ends of the pipeline to be detected pass through the two channels respectively. The side wall of the upper body 701 is provided with an air inlet 706, and the side wall of the lower body 702 is provided with an air outlet 707. The air inlet 706 of the snap-fit ​​unit 7 is connected to an air pump unit 3, which is used to fill nitrogen into the sealed chamber through the air inlet 706; the air outlet 707 is connected to a detection control unit 2, which is used to analyze the gas composition discharged from the air outlet to determine whether there is a leak.

[0054] The gas leak detection device establishes a sealed chamber, uses an air pump unit to continuously fill the chamber with clean test gas (such as air or nitrogen), and then analyzes the composition of the gas discharged from the outlet to determine whether there is a leak. It ensures the purity of the detection environment, eliminates interference from external factors, and can capture trace leaks in time, thereby improving the accuracy and reliability of the detection. Specifically, the upper and lower bodies are buckled together to form a sealed chamber, in which the pipeline to be detected is clamped. The air pump unit continuously fills the chamber with test gas through the air inlet, gradually replacing the original gas in the pipeline, ensuring that any leaking gas can be clearly detected. The detection control unit then analyzes the composition of the gas discharged from the outlet. If a component different from the test gas is detected, it indicates that there is a leak. This method not only enables dynamic monitoring and real-time feedback of leakage conditions, but also greatly reduces the possibility of false alarms, and is suitable for the detection of various types of flammable gases or harmful gases.

[0055] Embodiment 1: A rubber sleeve is provided on the top of the upper body 701 and is connected thereto; when there is a leak in the three-way joint of the pipeline to be detected, the rubber sleeve is used to accommodate the three-way joint; and a central hole 102 is provided on the mounting main board 101 to reserve space for the rubber sleeve. The rubber sleeve adopts a rubber bellows structure, which is integrally formed with the upper body, so as to facilitate the detection of the three-way joint leaking pipeline. Figure 5As shown, there are respectively the assembly of a pipe with a flange joint and a pipe with a tee joint. When detecting the pipe with the tee joint, the top of the tee joint extends into the rubber sleeve. This arrangement can ensure the leakage detection of the pipe with the tee joint.

[0056] Embodiment 2: The left and right sides of the mounting mainboard 101 of the main body unit 1 are both set in a concave shape, and the concave side is also provided with a through guide groove 105 for installing the width adjustment unit 5; the top of the mounting mainboard 101 is also provided with a handle 103 for convenient operation and transportation; the top of the mounting mainboard 101 is provided with a cover plate 104 for shielding the width adjustment mechanism, and the cover plate 104 is hinged to the mounting mainboard 101. It adopts a handheld mode, has a compact and flexible structure, and can be carried manually for inspection of pipelines along the road.

[0057] Embodiment 3: A width-adjusting unit 5 for adapting to different diameters of the pipes 8 to be inspected is also provided on both sides of the main body unit 1. An embracing unit 6 is connected to each end of each width-adjusting unit 5. Four embracing units 6 are used to fix the detection device on the pipe 8 to be inspected. The width-adjusting unit 5 includes a sliding assembly, two left and right arms 502 hinged to the sliding assembly, and a guide bar 501 hinged to the arm 502; and each arm 502 corresponds to a guide bar 501; wherein the sliding assembly includes a U-shaped guide rail 503, a width-adjusting slider 508 located in the U-shaped guide rail 503, and the U-shaped guide rail 503 is provided with at least two gear holes 504 along the length direction, the width-adjusting slider 508 is slidably connected to the U-shaped guide rail 503, and is locked and positioned by a locking pin 505, and the locking pin 505 penetrates After passing through the width adjustment slider 508, the corresponding gear hole 504 is inserted to realize the positioning of the width adjustment slider 508; the two arms 502 sandwich the U-shaped guide rail 503 in the middle, and the first end of each arm 502 is hinged to the width adjustment slider 508, and the second end of each arm 502 is hinged to the corresponding guide bar 501; the U-shaped guide rail 503 is perpendicular to the guide bar 501, and by adjusting the position of the width adjustment slider 508 on the U-shaped guide rail 503, the guide bar 501 is driven to move forward and backward along the guide groove 105, thereby realizing the width adjustment. The specific hinged installation method is: the end of the arm is rotatably connected with a pin shaft 506, the pin shaft 506 is connected to the guide bar 501 through an earring 507, the earring is rotatably sleeved on the pin shaft, and the side of the earring is fixedly connected to the guide bar. During installation, the guide bar 501 is located in the guide groove 105 of the main unit 1 and can move forward and backward along the groove; the end of the guide bar 501 is connected to the linear electric cylinder 601 corresponding to the embracing unit 6.

[0058] The action process is: the manually operated locking pin drives the width adjustment slider to slide in the U-shaped guide. When it slides to the appropriate position, the locking pin is twisted so that the lower end of the locking pin is inserted into the corresponding gear hole to achieve the locking work. During the sliding process of the width adjustment slider, the support arm is driven to push the guide bar to slide in the guide groove of the main unit.

[0059] The connection relationship is as follows: the U-shaped guide is fixedly connected to the corresponding position of the main body unit, a width adjustment slider is placed in the U-shaped guide, a manually operated locking pin is installed at the upper end of the width adjustment slider, the locking pin is connected to the width adjustment slider through a thread, and the lower end of the locking pin can be inserted into the gear hole through the width adjustment slider. Support ears are fixedly connected to both sides of the width adjustment slider, which are used to realize rotation connection with the support arm through a pin shaft. A support ear is also provided at one end of the guide bar, which is used to realize rotation connection with the other end of the support arm through a pin shaft.

[0060] In addition, the embracing unit 6 includes a linear electric cylinder 601. Among the four linear electric cylinders 601, two linear electric cylinders 601 are grouped together, corresponding to one width adjustment unit 5; one linear electric cylinder 601 in each group of linear electric cylinders 601 corresponds to one guide bar 501 of the width adjustment unit 5; the cylinder base of the linear electric cylinder 601 is fixedly connected to the end of the corresponding guide bar 501 of the width adjustment unit 5, and the linear electric cylinder 601 is installed downward. A support plate 602 is fixedly connected to the end of the cylinder rod of the linear electric cylinder 601, one side of the top of the support plate 602 is fixedly connected to the cylinder rod, and an upward locking pin 603 is installed on the other side of the top of the support plate 602. Moreover, a positioning pin hole 704 is provided at the bottom of the lower body 702, and the positioning pin hole 704 is adapted to the locking pin 603 of the embracing unit 6. During detection, the locking pin 603 is stuck in the corresponding positioning pin hole 704, which is used to realize that the snap-fit ​​unit 7 is tightly held on the pipeline to be detected.

[0061] Specifically, the coordinated work of the width adjustment unit and the clasping unit ensures that the entire detection device can fit tightly to the pipe surface, forming a good sealing environment. This provides pure detection conditions for subsequent gas composition analysis and improves the accuracy of the test results. Among them:

[0062] 1. The design of the width adjustment unit 5 enables the detection device to flexibly adjust the width to adapt to different diameters of the pipeline to be detected 8. This flexibility greatly expands the application range of the device, making it not only suitable for standard-sized pipelines, but also capable of processing pipelines of unconventional or special sizes.

[0063] Second, the locking pin 603 of the locking unit 6 is accurately inserted into the positioning pin hole 704 of the lower body 702 by the linear electric cylinder 601, ensuring that the locking unit 7 is firmly clamped on the pipeline to be tested. This tight fixing method greatly improves the safety of the testing process and prevents accidents caused by looseness.

[0064] 3. The electric cylinder 601 moves, and the cylinder rod extends to reserve space for placing the lower combination. When the lower combination is manually placed in place, the cylinder rod is retracted, and the electric cylinder rod drives the support plate to move upward. At this time, the locking pin is inserted into the pin hole of the lower combination during the upward movement, and the electric cylinder rod continues to move upward, so that the lower combination and the upper combination hold the pipeline tightly (the walking wheels must be out of contact with the pipeline at this time).

[0065] Fourth, the design of the rubber sleeve can not only accommodate irregularly shaped tee joints, but also play a buffering role during the detection process to protect the pipeline and detection equipment from mechanical damage.

[0066] Embodiment 4, support unit 4 comprises support seat 401 and guide shaft 403 connected to body unit 1, specifically, support seat is connected to mounting main board of body unit; support seat 401 outer wall is installed with a lifting motor 405, one end of guide shaft 403 passes through guide hole 409 of support seat 401, and the protruding end is connected to U-shaped bracket 407, and the shape of guide hole 409 is adapted to guide shaft 403, and is used for axial position limiting of guide shaft; U-shaped bracket 407 is installed with running wheel 406; support seat 401 is provided with gear 402, and the output shaft of lifting motor 405 extends into support seat 401, and the output shaft is connected with gear 402, and is used for driving gear rotation; gear 402 is meshed with guide shaft 403; gear rotation drives guide shaft 403 to move up and down along guide hole, and drives running wheel to lift up and down. Specifically, one side of guide shaft is provided with teeth in longitudinal direction, and the teeth are meshed with gear, and because it is not full-circle teeth, it can prevent the guide shaft from rotating. The present invention is provided with supporting units at both ends, so as to realize the function of supporting the equipment on the pipeline. At the same time, the equipment can walk on the pipeline under manual dragging, so as to facilitate the movement and transportation of the equipment.

[0067] Embodiment 5: A cylindrical magnetic buckle 703 is provided at the top of the upper body 701, and a positioning magnetic suction head 106 is provided at the bottom of the main body unit 1. The cylindrical magnetic buckle 703 is attracted to the positioning magnetic suction head 106 to realize the positioning and fixing of the snap-fit ​​unit 7 on the main body unit 1; (Specifically, the positioning magnetic suction head is provided with a groove at the end of the cylindrical head, and a permanent magnet is installed in the groove to facilitate attraction.) A positioning pin 708 is provided at the bottom of the upper body 701, and a positioning hole 709 corresponding to the positioning pin 708 is provided at the top of the lower body 702. When the upper body 701 and the lower body 702 are buckled, the positioning pin 708 is located in the positioning hole 709, so that the upper and lower bodies are accurately buckled; and after buckling, the upper and lower bodies are sealed by a sealing strip. Specifically, the dual protection mechanism of magnetic connection and mechanical positioning ensures that the snap-fit ​​unit will not accidentally loosen even under vibration or other external forces, thereby ensuring the safety of the detection process. This is especially important for pipelines transporting flammable or hazardous gases, and can effectively prevent potential safety risks.

[0068] In general, the snap-on unit enhances the connection stability and sealing performance between the snap-on unit and the main unit through multiple designs such as magnetic connection, precise positioning and sealing strips, simplifies the operation process, and improves the safety and accuracy of detection.

[0069] The steps and working principle of gas leak detection method are as follows:

[0070] S1. For the gas transmission pipeline to be inspected, select the matching snap-fit ​​unit specifications according to the pipeline diameter (the semi-arc radius on the snap-fit ​​unit should be the same as the radius of the pipeline to be inspected). The snap-fit ​​unit model specifications are designed to match the commonly used pipe diameters.

[0071] S2. The upper end surface of the upper body of the buckle unit is provided with magnetic buckles (4 evenly distributed on the upper surface of the upper body) and the positioning magnetic suction heads (4 evenly distributed on the lower end of the installation mainboard) cooperate to fix the upper body on the installation mainboard.

[0072] S3. Manually carry the handle and place the main unit together with the upper combined unit on the measured pipe, support the walking wheels of the support unit on the pipe to support the main body of the detection device. Manually drag the detection unit on the detected pipe by holding the handle and drag the entire detection unit to the position that needs to be detected.

[0073] S4. Control the lifting motor of the support unit to move, and drive the guide shaft to move up and down through the lifting motor, so that the upper combination and the pipeline reach a suitable position (the semi-arc opening of the upper combination is combined with the pipeline surface).

[0074] S5. At this time, the lower combination unit is manually buckled upward from the lower end of the pipeline to the upper combination unit, so as to achieve the purpose of buckling the upper and lower combination units.

[0075] S6. Then the linear electric cylinder is controlled to retract the linear electric cylinder rod so that the locking pin is inserted into the positioning pin hole on the lower combination body, thereby locking the lower combination body unit with the locking pin.

[0076] S7. When the locking pin is inserted into the locking pin hole of the lower assembly, it indicates that the lower assembly has been integrated with the upper assembly. At this time, the travel wheels of the control support unit are raised so that the travel wheels are separated from the pipeline.

[0077] S8. The entire detection unit is mounted on the pipeline to be detected through the upper and lower bodies.

[0078] S9, control the linear electric cylinder to continue to retract the electric cylinder rod upward, and make the upper and lower bodies hold the pipe tightly during the retraction process (the linear electric cylinder is set with a retraction force value).

[0079] S10. At this time, the pipe wrapped between the upper body and the lower body forms a sealed chamber, which prevents the flow of gas between the inside and outside of the wrapped chamber.

[0080] S11. At this time, the air pump unit is started, and the air pump unit fills nitrogen into the sealed chamber through the air inlet. The newly entered nitrogen drives the gas in the chamber out from the air outlet. After the air pump works for a certain period of time (the purpose is to drive out all the original gas in the sealed chamber), it enters the detection stage.

[0081] S12. At this time, the air pump continuously fills the gas into the sealed chamber, and the gas from the gas outlet in the sealed chamber enters the detection control unit. The detection control unit confirms whether there is leakage gas component in the gas based on the gas component analysis, thereby confirming whether a leakage occurs.

[0082] S13. After a certain section is inspected, the cylinder rod of the linear electric cylinder extends to separate the lower body from the pipeline, and the lifting motor of the support unit is controlled to move. The lifting motor drives the guide shaft to move downward, so that the upper body is separated from the pipeline surface, and the entire inspection device is supported by the walking wheels above the pipeline. Then, the inspection unit is dragged on the inspected pipeline by holding the handle and dragged to the next section where the inspection needs to be performed.

[0083] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features therein may be replaced by equivalents. Therefore, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A gas leakage detection device, comprising a main unit (1), characterized in that: The main body unit (1) comprises a mounting main board (101), and a supporting unit (4) is mounted on each side of the mounting main board (101) for supporting the detection device and enabling movement on the pipeline (8) to be detected; A buckling unit (7) is provided at the bottom of the mounting main board (101), and the buckling unit (7) comprises an upper body (701) and a lower body (702), the upper body (701) and the lower body (702) are both shell-shaped structures, and the two are detachably connected by a connecting piece, and form a sealed chamber after being buckled together; and a channel for the pipeline (8) to pass through is formed at each end of the sealed chamber; when in use, the upper body (701) and the lower body (702) clamp the pipeline (8) to be detected between the two, and the two ends of the pipeline to be detected pass through the two channels respectively; The side wall of the upper body (701) is provided with an air inlet (706), and the side wall of the lower body (702) is provided with an air outlet (707).

2. The gas leakage detection device according to claim 1, characterized in that: A rubber sleeve is provided on the top of the upper body (701) and is in communication with the upper body; when the three-way joint of the pipeline to be detected has a leak, the rubber sleeve is used to accommodate the three-way joint; and a central hole (102) is provided on the mounting main board (101) to reserve space for the rubber sleeve.

3. The gas leakage detection device according to claim 1, characterized in that: A width adjustment unit (5) for adapting to different diameters of the pipelines (8) to be inspected is also provided on both sides of the main body unit (1); each width adjustment unit (5) is connected to an embracing unit (6) at both ends; the four embracing units (6) are used to fix the detection device on the pipeline (8) to be inspected.

4. The gas leakage detection device according to claim 1, characterized in that: The left and right sides of the mounting main board (101) of the main body unit (1) are both arranged in a concave shape, and the concave side is also provided with a through guide groove (105) for mounting the width adjustment unit (5); a handle (103) is also arranged on the top of the mounting main board (101) to facilitate operation and transportation by personnel; and a cover plate (104) for shielding the width adjustment mechanism is respectively arranged on both sides of the top of the mounting main board (101), and the cover plate (104) is hinged to the mounting main board (101).

5. The gas leakage detection device according to claim 4, characterized in that: The width adjustment unit (5) comprises a sliding assembly, two left and right support arms (502) hinged to the sliding assembly, and a guide bar (501) hinged to the support arms (502); and each support arm (502) corresponds to a guide bar (501); The sliding assembly comprises a U-shaped guide rail (503), a width-adjusting slider (508) located in the U-shaped guide rail (503), and the U-shaped guide rail (503) is provided with at least two gear holes (504) along the length direction. The width-adjusting slider (508) is slidably connected to the U-shaped guide rail (503) and is locked and positioned by a locking pin (505). The locking pin (505) passes through the width-adjusting slider (508) and is inserted into the corresponding gear hole (504) to achieve the positioning of the width-adjusting slider (508); The two arms (502) sandwich the U-shaped guide rail (503) in the middle, and the first end of each arm (502) is hinged to the width adjustment slider (508), and the second end of each arm (502) is hinged to the corresponding guide bar (501); During installation, the guide bar (501) is located in the guide groove (105) of the main body unit (1) and can move forward and backward along the groove; the end of the guide bar (501) is connected to the linear electric cylinder (601) corresponding to the embracing unit (6).

6. The gas leakage detection device according to claim 5, characterized in that: The embracing unit (6) comprises a linear electric cylinder (601), the electric cylinder base of the linear electric cylinder (601) is fixedly connected to the end of the guide bar (501) of the corresponding width adjustment unit (5), the linear electric cylinder (601) is installed downward, a support plate (602) is fixedly connected to the end of the cylinder rod of the linear electric cylinder (601), one side of the top of the support plate (602) is fixedly connected to the cylinder rod, and an upward locking pin (603) is installed on the other side of the top of the support plate (602).

7. The gas leakage detection device according to claim 1, characterized in that: The support unit (4) comprises a support base (401) connected to the main body unit (1) and a guide shaft (403); a lifting motor (405) is installed on the outer wall of the support base (401); one end of the guide shaft (403) passes through a guide hole (409) of the support base (401), and the protruding end is connected to a U-shaped bracket (407); the shape of the guide hole (409) is adapted to the guide shaft (403) and is used for axial limiting of the guide shaft; A walking wheel (406) is installed on the U-shaped bracket (407); a gear (402) is arranged in the support seat (401); the output shaft of the lifting motor (405) extends into the support seat (401), and the output shaft is connected to the gear (402) for driving the gear to rotate; the gear (402) is meshedly connected with the guide shaft (403); the rotation of the gear drives the guide shaft (403) to move up and down along the guide hole, thereby driving the walking wheel to move up and down.

8. The gas leakage detection device according to claim 1, characterized in that: The air inlet (706) of the snap-fit ​​unit (7) is connected to an air pump unit (3), and the air pump unit (3) is used to fill air or nitrogen into the sealed chamber through the air inlet (706); the air outlet (707) is connected to a detection control unit (2), and the detection control unit (2) is used to analyze the gas composition discharged from the air outlet to determine whether there is a leak.

9. The gas leakage detection device according to claim 3, characterized in that: The top of the upper body (701) is provided with a cylindrical magnetic buckle (703), and the bottom of the main body unit (1) is provided with a positioning magnetic suction head (106), and the cylindrical magnetic buckle (703) and the positioning magnetic suction head (106) are attracted to each other, so that the buckle unit (7) is positioned and fixed on the main body unit (1); The bottom of the upper body (701) is provided with a positioning pin (708), and the top of the lower body (702) is provided with a positioning hole (709) corresponding to the positioning pin (708). When the upper body (701) and the lower body (702) are buckled together, the positioning pin (708) is located in the positioning hole (709), so that the upper and lower bodies are accurately buckled together; and after buckling, the upper and lower bodies are sealed by a sealing strip. The bottom of the lower body (702) is provided with a positioning pin hole (704), which is adapted to the locking pin (603) of the engaging unit (6). During detection, the locking pin (603) is locked in the corresponding positioning pin hole (704), so as to enable the engaging unit (7) to be tightly attached to the pipeline to be detected.

10. A gas leak detection method, characterized in that: The gas leakage detection method is based on the gas leakage detection device according to any one of claims 1 to 9, and the detection method comprises the steps of: S1, the snap-fit ​​unit (7) has holes of different specifications, and a matching snap-fit ​​unit (7) is selected according to the diameter of the pipeline (8) to be tested; S2, supporting the main body unit (1) above the pipeline to be inspected by means of the walking wheels (406) on the supporting unit (4), and using the handle (103) on the mounting main board (101) to drag the inspection device along the pipeline to the position to be inspected; S3, controlling the lifting motor (405) in the support unit (4) to drive the guide shaft (403) to move up and down, so that the upper assembly (701) fits the surface of the pipeline to be inspected; S4, manually buckle the lower body (702) with the upper body (701) from below the pipeline to form a sealed chamber. At this time, the upper body (701) and the lower body (702) are accurately aligned through the positioning pins (708) and the positioning holes (709) and are sealed by the sealing strip; S5, controlling the linear electric cylinder (601) in the clasping unit (6) to insert the locking pin (603) into the positioning pin hole (704) at the bottom of the lower body (702), thereby fixing the clasping unit (7) on the pipeline to be inspected; S6, controlling the lifting motor (405) of the support unit (4) again, so that the walking wheel (406) is separated from the pipeline, ensuring that the entire detection device is firmly held on the pipeline; S7, start the air pump unit (3) and fill nitrogen into the sealed chamber through the air inlet (706) until the original gas is completely discharged; S8, the detection control unit (2) analyzes the gas composition discharged from the gas outlet (707) to determine whether there is a leak; S9, after completing the inspection of a certain section of the pipeline, the linear electric cylinder (601) is controlled to release the locking pin (603), so that the lower combination (702) is separated from the pipeline, and at the same time, the lifting motor (405) of the support unit (4) is controlled to make the walking wheel (406) support the pipeline again, so as to move the inspection device to the next inspection position; S10. Repeat the above steps until all pipeline sections that need to be inspected are completed.

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