Multidirectional diffusion sampling head of monitoring probe

Abstract

The utility model relates to the technical field of gas monitoring equipment, in particular to a multidirectional diffusion sampling head of a monitoring probe, which comprises a detection vertical pipe communicated with an exhaust pipeline in a cable tunnel, an exhaust fan is arranged in the detection vertical pipe, a maintenance port is arranged on the front side of the detection vertical pipe, a maintenance door is arranged at the maintenance port, and a gas monitor is arranged on the front side of the maintenance door. A monitoring probe of the gas monitor is located under the exhaust fan, a rectangular gas collection box is arranged at the bottom of the detection vertical pipe, a gas inlet pipe is arranged at the bottom of the rectangular gas collection box, rectangular holes are formed in the four side faces of the rectangular gas collection box, diffusion sampling pipes are arranged at the rectangular holes, and gas inlets are formed in the bottoms of the diffusion sampling pipes. According to the multidirectional diffusion sampling head of the monitoring probe, the combination design of the rectangular gas collection box and the diffusion sampling pipes is adopted, gas collection areas in multiple directions are covered by the diffusion sampling pipes on the four side faces, and gathering and detection of multidirectional gas samples can be achieved only through a single monitoring probe.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas monitoring equipment, concretely to the multidirectional diffusion sampling head of monitoring probe. BACKGROUND

[0002] Cable tunnels are an important part of modern urban infrastructure, mainly used for laying various cables such as power and communication. These tunnels are usually located underground or inside buildings, and the space is relatively closed, making it easy to accumulate harmful gases (such as carbon monoxide, methane, hydrogen sulfide, etc.). Therefore, environmental monitoring is particularly important. Since the gas concentration in the cable tunnel can directly affect the operation of the equipment and the safety of personnel inside the tunnel, timely and accurate gas monitoring plays a key role in preventing accidents and ensuring normal operation of facilities.

[0003] To meet the demand for gas monitoring in cable tunnels, various gas monitoring devices have been developed. Among them, the patent with publication number CN216484871U discloses an internal gas monitoring device for cable tunnels, which includes a main pipe, a plurality of first branch pipes are fixed through the bottom of the main pipe, first sliding grooves are formed in the inner walls of both ends of the first branch pipes, first sliding blocks are slidably connected in the first sliding grooves, a first spring is fixed between the first sliding blocks and the inner walls of the first sliding grooves through bolts, a fixed plate is fixed between the two first sliding blocks through bolts, a motor is fixed at the bottom of the fixed plate through bolts, a fan blade is connected to the output shaft of the motor, and a monitoring mechanism is provided on the first branch pipe. In the utility model, the motor output shaft drives the fan blade to rotate, the rotating fan draws the gas in the tunnel into the first branch pipe, promoting air circulation in the first branch pipe. At the same time, under the action of the vibration of the motor and the first spring, the motor and the fan blade move in the upward and downward directions, accelerating air circulation, thereby improving the accuracy of real-time monitoring of the monitoring probe.

[0004] However, the existing technology has certain deficiencies in the configuration of the monitoring probe. Since an independent monitoring probe needs to be set up in each first branch pipe, this not only increases the cost of equipment, but also increases the workload of maintaining the monitoring probe in the later stage. To solve this problem, we propose a multidirectional diffusion sampling head for monitoring probes. The design of this sampling head aims to optimize the directionality and efficiency of gas sampling, reducing the dependence on the number of monitoring probes, thereby reducing costs while ensuring the accuracy and real-time nature of gas monitoring. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a multidirectional diffusion sampling head for monitoring probes to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0007] The multi-directional diffusion sampling head of the monitoring probe includes a detection riser connected to the exhaust pipe inside the cable tunnel. The detection riser connects to the tunnel exhaust pipe and forms a gas flow channel. An exhaust fan is installed inside the detection riser near the top, powered by an external power source. The exhaust fan accelerates gas flow to improve monitoring efficiency. A maintenance port is provided on the front side of the detection riser, providing operating space for equipment maintenance. A maintenance door is provided at the maintenance port to close the port and protect internal components. A cable pass is provided at the top of the maintenance door for the exhaust fan wire to pass through. The cable pass is sealed, for example, by using a rubber block. A gas monitor is installed on the front side of the maintenance door, used to analyze gas concentration data. The monitoring probe of the gas monitor is located directly below the exhaust fan, and the monitoring probe achieves accurate sampling through direct contact with the airflow.

[0008] Combination Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the bottom of the detection vertical tube is provided with a rectangular gas collection box, which is used to collect multi-directional gas samples. The bottom of the rectangular gas collection box is provided with an air inlet pipe, which provides a collection channel for the gas at the bottom. Rectangular holes are opened on all four sides of the rectangular gas collection box, which are used to connect to a diffusion sampling tube to achieve multi-directional coverage. A diffusion sampling tube is installed at the rectangular hole, which is used to expand the gas collection range. An air inlet is opened at the bottom of the diffusion sampling tube near the outer end, which provides an entry path for external gas.

[0009] Preferred, such as Figure 3 As shown, a first frame-shaped connecting plate is provided on the outer wall of the detection vertical pipe near the top. The first frame-shaped connecting plate is bolted to the bottom of the exhaust pipe inside the cable tunnel. The first frame-shaped connecting plate is used to fix the connection between the detection vertical pipe and the tunnel exhaust pipe.

[0010] Preferred, such as Figure 4 As shown, U-shaped guide rails are provided on the left and right sides of the inner wall of the detection vertical pipe and near the top. The U-shaped guide rails are used to guide the sliding insertion of the mounting plate. The mounting plate is inserted between the two U-shaped guide rails. The mounting plate provides a stable mounting platform for the exhaust fan. An air duct is opened at the bottom of the mounting plate. The exhaust fan is installed on the top of the mounting plate by bolts.

[0011] Mounting seats are provided at the top and bottom of the front side of the maintenance door. The mounting seats are installed on the front side of the detection vertical pipe by bolts. The mounting seats are used to fix the connection between the maintenance door and the detection vertical pipe.

[0012] A frame-shaped rubber pad is fitted on the outside of the maintenance door. The outer wall of the frame-shaped rubber pad is tightly fitted with the inner wall of the maintenance opening. The frame-shaped rubber pad is used to seal the maintenance opening to prevent gas leakage.

[0013] The detection vertical pipe is provided with a tapered air guide pipe at a position close to the bottom, and the tip of the tapered air guide pipe is directed towards the monitoring probe, and the tapered air guide pipe is used for concentrating airflow and guiding it to the monitoring probe.

[0014] Preferably, as shown in the drawings, Figure 3 As shown, the bottom of the outer wall of the detection vertical pipe is provided with a second frame-shaped butt joint plate, the second frame-shaped butt joint plate is used for connecting the rectangular gas collecting box and the detection vertical pipe, the top of the outer wall of the rectangular gas collecting box is provided with a third frame-shaped butt joint plate, the third frame-shaped butt joint plate is connected with the second frame-shaped butt joint plate through bolts and nuts, and the third frame-shaped butt joint plate cooperates with the second frame-shaped butt joint plate to realize modular assembly.

[0015] Preferably, as shown in the drawings, Figure 5 As shown, the bottom end of the air inlet pipe is threadedly connected with a dust cover, and the air inlet port of the dust cover is provided with a dust screen, and the dust cover is used for filtering large-particle impurities to protect the monitoring probe.

[0016] Preferably, as shown in the drawings, Figure 6 As shown, the bottom of the diffusion sampling pipe and the position of the air inlet port are provided with a rectangular bottom plate, the rectangular bottom plate provides a mounting basis for a dust screen plate, the top of the rectangular bottom plate is provided with a U-shaped insertion slot, the U-shaped insertion slot facilitates quick plugging and replacement of the dust screen plate, the U-shaped insertion slot is inserted with a dust screen plate, the dust screen plate is used for filtering the gas entering the diffusion sampling pipe, and the bottom of the rectangular bottom plate is provided with an air inlet hole in communication with the U-shaped insertion slot.

[0017] The outer wall of the diffusion sampling pipe is provided with a fourth frame-shaped butt joint plate, the fourth frame-shaped butt joint plate is mounted on the side of the rectangular gas collecting box through bolts, and the fourth frame-shaped butt joint plate is used for fixing the connection between the diffusion sampling pipe and the rectangular gas collecting box.

[0018] Preferably, as shown in the drawings, Figure 2 As shown, the outer side of the diffusion sampling pipe is provided with a bracket, the bracket is used for supporting the diffusion sampling pipe to reduce structural load, the bracket comprises a U-shaped supporting plate, the bottom of the diffusion sampling pipe abuts against the bottom of the inner wall of the U-shaped supporting plate, and the U-shaped supporting plate is attached to the bottom of the diffusion sampling pipe to provide supporting force.

[0019] Both sides of the U-shaped supporting plate are provided with pull rods, the top of the pull rod is provided with a mounting top plate, and the mounting top plate is mounted on the inner wall of the cable tunnel through bolts.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] 1. The multi-directional diffusion sampling head of the monitoring probe adopts a combination design of a rectangular gas collection box and a diffusion sampling pipe, covers multiple directional gas collection areas through four side diffusion sampling pipes, forms a three-dimensional sampling network in combination with the bottom gas inlet pipe, realizes the convergence and detection of multi-directional gas samples through a single monitoring probe, and significantly reduces the cost and maintenance burden caused by the multi-probe configuration in the traditional device.

[0022] 2. The multi-directional diffusion sampling head of the monitoring probe, the exhaust fan accelerates the gas flow, cooperates with the conical air guide pipe to concentrate the airflow and guide it to the monitoring probe, ensures that the gas contacts the probe quickly and uniformly, and the dust screen plate design of the diffusion sampling pipe effectively reduces dust interference and improves the representativeness of the gas sample and the reliability of the monitoring data.

[0023] 3. The multi-directional diffusion sampling head of the monitoring probe, the U-shaped bracket and the pull rod cooperate to install the top plate, providing stable support for the diffusion sampling pipe; the detachable design of the dust cover and the dust screen plate can effectively intercept large particles of impurities, and is convenient to clean or replace, prolonging the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole first visual angle structure schematic view of the utility model;

[0025] Figure 2 It is a whole second visual angle structure schematic view of the utility model;

[0026] Figure 3 It is a part structure schematic view one of the utility model;

[0027] Figure 4 It is a part structure schematic view two of the utility model;

[0028] Figure 5 It is a rectangular gas collection box structure schematic view in the utility model;

[0029] Figure 6 It is a diffusion sampling pipe structure schematic view in the utility model;

[0030] In the figure: 1, detection standpipe; 10, maintenance opening; 11, U-shaped guide rail; 12, mounting plate; 120, air guide opening; 13, conical air guide pipe; 14, first frame-shaped butt plate; 15, second frame-shaped butt plate; 2, exhaust fan; 3, maintenance door; 30, mounting seat; 31, frame-shaped rubber pad; 4, gas monitor; 40, monitoring probe; 5, rectangular gas collection box; 50, rectangular hole; 51, air inlet pipe; 52, dust cover; 53, third frame-shaped butt plate; 6, diffusion sampling pipe; 60, air inlet; 61, rectangular bottom plate; 610, U-shaped slot; 611, air inlet hole; 62, dust screen plate; 63, fourth frame-shaped butt plate; 7, bracket; 70, U-shaped bracket plate; 71, pull rod; 72, mounting top plate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] Please refer to Figures 1-6 The present application provides a technical solution:

[0034] The multi-directional diffusion sampling head of the monitoring probe comprises a detection vertical pipe 1 in communication with the internal exhaust pipe of the cable tunnel, the detection vertical pipe 1 is used for connecting the exhaust pipe of the tunnel and forming a gas flow channel, an exhaust fan 2 is arranged in the detection vertical pipe 1 and close to the top, and the exhaust fan 2 is used for accelerating the gas flow to improve the monitoring efficiency; a maintenance opening 10 is arranged on the front side of the detection vertical pipe 1, the maintenance opening 10 provides an operation space for equipment maintenance, a maintenance door 3 is arranged at the maintenance opening 10, the maintenance door 3 is used for closing the maintenance opening 10 and protecting the internal components, a wire passing opening is arranged on the top of the maintenance door 3 for the wire of the exhaust fan 2 to pass through, the wire passing opening is sealed, for example, by a rubber block, a gas monitor 4 is arranged on the front side of the maintenance door 3, the gas monitor 4 is used for analyzing gas concentration data, and a monitoring probe 40 of the gas monitor 4 is located directly below the exhaust fan 2, and the monitoring probe 40 realizes accurate sampling through direct contact with the airflow;

[0035] In combination with Figure 1 、 Figure 3 、 Figure 5 and Figure 6 , the bottom of the detection vertical pipe 1 is provided with a rectangular gas collection box 5, the rectangular gas collection box 5 is used for converging multi-directional gas samples, the bottom of the rectangular gas collection box 5 is provided with an air inlet pipe 51, the air inlet pipe 51 provides a collection channel for the bottom gas, and rectangular holes 50 are arranged on the four sides of the rectangular gas collection box 5, the rectangular holes 50 are used for connecting diffusion sampling pipes 6 to realize multi-directional coverage, and the diffusion sampling pipes 6 are arranged at the rectangular holes 50, the diffusion sampling pipes 6 are used for expanding the gas collection range, and air inlets 60 are arranged on the bottom of the diffusion sampling pipes 6 and close to the outer ends.

[0036] In this embodiment, as shown in Figure 3 , a first frame-shaped butt joint plate 14 is arranged on the outer wall of the detection vertical pipe 1 and close to the top, the first frame-shaped butt joint plate 14 is installed on the bottom of the internal exhaust pipe of the cable tunnel through bolts, and the first frame-shaped butt joint plate 14 is used for fixing the connection between the detection vertical pipe 1 and the exhaust pipe of the tunnel.

[0037] Specifically, as shown in Figure 4 , U-shaped guide rails 11 are arranged on the left and right sides of the inner wall of the detection vertical pipe 1 and close to the top, the U-shaped guide rails 11 are used for guiding the sliding insertion of the mounting plate 12, the mounting plate 12 is inserted between the two U-shaped guide rails 11, the mounting plate 12 provides a stable mounting platform for the exhaust fan 2, a gas guide opening 120 is arranged on the bottom of the mounting plate 12, and the exhaust fan 2 is installed on the top of the mounting plate 12 through bolts;

[0038] The top and bottom of the front side of the maintenance door 3 are both provided with mounting seats 30, the mounting seats 30 are installed on the front side of the detection vertical pipe 1 through bolts, and the mounting seats 30 are used for fixing the connection between the maintenance door 3 and the detection vertical pipe 1;

[0039] The outer side of the maintenance door 3 is sleeved with a frame-shaped rubber pad 31, the outer wall of the frame-shaped rubber pad 31 is tightly fitted with the inner wall of the maintenance opening 10, and the frame-shaped rubber pad 31 is used for sealing the maintenance opening 10 to prevent gas leakage;

[0040] A tapered air guide pipe 13 is arranged at a position close to the bottom in the vertical pipe 1, the tip of the tapered air guide pipe 13 is directed towards the monitoring probe 40, and the tapered air guide pipe 13 is used for concentrating airflow and guiding to the monitoring probe 40.

[0041] Further, as shown in the drawings, Figure 3 The bottom of the outer wall of the detection vertical pipe 1 is provided with a second frame-shaped butt joint plate 15, the second frame-shaped butt joint plate 15 is used for connecting the rectangular gas collecting box 5 and the detection vertical pipe 1, the top of the outer wall of the rectangular gas collecting box 5 is provided with a third frame-shaped butt joint plate 53, the third frame-shaped butt joint plate 53 is connected with the second frame-shaped butt joint plate 15 through bolts and nuts, and the third frame-shaped butt joint plate 53 cooperates with the second frame-shaped butt joint plate 15 to realize modular assembly.

[0042] Further, as shown in the drawings, Figure 5 The bottom end of the air inlet pipe 51 is threadedly connected with a dust cover 52, a dust screen is arranged at the air inlet port of the dust cover 52, and the dust cover 52 is used for filtering large-particle impurities to protect the monitoring probe 40.

[0043] Further, as shown in the drawings, Figure 6 The bottom of the diffusion sampling pipe 6 and at the position of the air inlet 60 is provided with a rectangular bottom plate 61, the rectangular bottom plate 61 provides a mounting basis for a dust screen plate 62, the top of the rectangular bottom plate 61 is provided with a U-shaped insertion slot 610, the U-shaped insertion slot 610 facilitates quick plug-in replacement of the dust screen plate 62, the dust screen plate 62 is inserted into the U-shaped insertion slot 610, the dust screen plate 62 is used for filtering gas entering the diffusion sampling pipe 6, and the bottom of the rectangular bottom plate 61 is provided with an air inlet hole 611 in communication with the U-shaped insertion slot 610;

[0044] The outer wall of the diffusion sampling pipe 6 is provided with a fourth frame-shaped butt joint plate 63, the fourth frame-shaped butt joint plate 63 is mounted on the side of the rectangular gas collecting box 5 through bolts, and the fourth frame-shaped butt joint plate 63 is used for fixing the connection of the diffusion sampling pipe 6 and the rectangular gas collecting box 5.

[0045] Further, as shown in the drawings, Figure 2 The outer side of the diffusion sampling pipe 6 is provided with a bracket 7, the bracket 7 is used for supporting the diffusion sampling pipe 6 to reduce structural load, the bracket 7 includes a U-shaped supporting plate 70, the bottom of the diffusion sampling pipe 6 abuts against the bottom of the inner wall of the U-shaped supporting plate 70, and the U-shaped supporting plate 70 abuts against the bottom of the diffusion sampling pipe 6 to provide supporting force;

[0046] The two sides of the U-shaped supporting plate 70 are provided with pull rods 71, and the top of each pull rod 71 is provided with a mounting top plate 72 which is bolted to the inner wall of the cable tunnel.

[0047] In use, the multi-directional diffusion sampling head of the monitoring probe of the embodiment is bolted to the internal exhaust pipeline of the cable tunnel through the first frame-shaped butt joint plate 14 of the detection vertical pipe 1, so as to ensure that the gas flow channel of the detection vertical pipe 1 is through; the exhaust fan 2 is inserted into the mounting plate 12 through the U-shaped guide rail 11 and fixed, the exhaust fan 2 accelerates the airflow in the detection vertical pipe 1; the maintenance door 3 is fixed to the front side of the detection vertical pipe 1 through the mounting seat 30, the maintenance opening 10 is sealed by the frame-shaped rubber pad 31, and the monitoring probe 40 of the gas monitor 4 is arranged directly below the exhaust fan 2; the rectangular gas collecting box 5 is bolted to the second frame-shaped butt joint plate 15 at the bottom of the detection vertical pipe 1 through the third frame-shaped butt joint plate 53, and the dust cover 52 is mounted at the bottom end of the air inlet pipe 51; the diffusion sampling pipe 6 is mounted at the rectangular hole 50 in the four sides of the rectangular gas collecting box 5, the fourth frame-shaped butt joint plate 63 is bolted, and the dust screen plate 62 is inserted into the U-shaped slot 610 at the position of the air inlet 60 at the bottom of the diffusion sampling pipe 6; the U-shaped supporting plate 70 of the bracket 7 supports the bottom of the diffusion sampling pipe 6, and the mounting top plate 72 is bolted to the inner wall of the cable tunnel; after the exhaust fan 2 is started, the gas in the tunnel enters the rectangular gas collecting box 5 through the air inlet 60 of the diffusion sampling pipe 6 and the air inlet pipe 51, is concentrated and guided to the monitoring probe 40 through the conical air guide pipe 13, is analyzed in real time by the gas monitor 4, and the internal components can be quickly repaired through the maintenance door 3 during maintenance.

[0048] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, the above embodiments and the description in the specification are only preferred examples of the utility model, and are not used to limit the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. Multidirectional diffusion sampling head of a monitoring probe, comprising a detection vertical pipe (1) in communication with an internal exhaust duct of a cable tunnel, characterized in that: The detection vertical pipe (1) is provided with an exhaust fan (2) at a position close to the top, a maintenance opening (10) is formed on the front side of the detection vertical pipe (1), a maintenance door (3) is arranged at the maintenance opening (10), a gas monitor (4) is arranged on the front side of the maintenance door (3), a monitoring probe (40) of the gas monitor (4) is located directly below the exhaust fan (2), a rectangular gas collecting box (5) is arranged at the bottom of the detection vertical pipe (1), an air inlet pipe (51) is arranged at the bottom of the rectangular gas collecting box (5), rectangular holes (50) are formed on the four sides of the rectangular gas collecting box (5), and a diffusion sampling pipe (6) is arranged at the rectangular holes (50).

2. The multidirectional diffusion probe head of claim 1, wherein: A first frame-shaped butt joint plate (14) is arranged at a position close to the top of the outer wall of the detection vertical pipe (1), and the first frame-shaped butt joint plate (14) is bolted to the bottom of the internal exhaust pipeline of the cable tunnel.

3. The multi-directional diffusion probe head of claim 1, wherein: U-shaped guide rails (11) are arranged at positions close to the top of the inner walls of the left and right sides of the detection vertical pipe (1), a mounting plate (12) is inserted between the two U-shaped guide rails (11), a gas guide opening (120) is formed at the bottom of the mounting plate (12), and the exhaust fan (2) is bolted to the top of the mounting plate (12).

4. The multidirectional diffusion probe head of claim 1, wherein: Mounting seats (30) are arranged at the top and the bottom of the front side of the maintenance door (3), and the mounting seats (30) are bolted to the front side of the detection vertical pipe (1).

5. The multi-directional diffusion probe head of claim 1, wherein: A frame-shaped rubber pad (31) is arranged on the outer side of the maintenance door (3), and the outer wall of the frame-shaped rubber pad (31) is tightly attached to the inner wall of the maintenance opening (10).

6. The multi-directional diffusion probe head of claim 1, wherein: A conical gas guide pipe (13) is arranged at a position close to the bottom of the detection vertical pipe (1), and the tip of the conical gas guide pipe (13) faces the monitoring probe (40).

7. The multi-directional diffusion probe head of claim 1, wherein: A second frame-shaped butt joint plate (15) is arranged at the bottom of the outer wall of the detection vertical pipe (1), a third frame-shaped butt joint plate (53) is arranged at the top of the outer wall of the rectangular gas collecting box (5), and the third frame-shaped butt joint plate (53) is connected to the second frame-shaped butt joint plate (15) by bolts and nuts.

8. The multi-directional diffusion probe head of claim 1, wherein: A dustproof cover (52) is threadedly connected to the bottom end of the air inlet pipe (51), and a dustproof net is arranged at the air inlet port of the dustproof cover (52).

9. The multi-directional diffusion probe head of claim 1, wherein: A rectangular bottom plate (61) is arranged at the bottom of the diffusion sampling pipe (6) and at a position corresponding to the air inlet port (60), a U-shaped insertion slot (610) is formed at the top of the rectangular bottom plate (61), a dustproof net plate (62) is inserted into the U-shaped insertion slot (610), an air inlet hole (611) is formed at the bottom of the rectangular bottom plate (61) and communicates with the U-shaped insertion slot (610), a fourth frame-shaped butt joint plate (63) is arranged on the outer wall of the diffusion sampling pipe (6), and the fourth frame-shaped butt joint plate (63) is bolted to the side of the rectangular gas collecting box (5).

10. The multi-directional diffusion probe head of claim 1, wherein: The outer side of the diffusion sampling pipe (6) is provided with a bracket (7), the bracket (7) comprises a U-shaped supporting plate (70), the bottom of the diffusion sampling pipe (6) is in abutment with the bottom of the inner wall of the U-shaped supporting plate (70), the two sides of the U-shaped supporting plate (70) are provided with pull rods (71), the top of the pull rod (71) is provided with a mounting top plate (72), and the mounting top plate (72) is mounted on the inner wall of the cable tunnel through bolts.

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