Coal mine ventilation pipeline comprehensive simulation system and simulation method

Abstract

A comprehensive simulation system for a coal mine ventilation pipeline comprises a simulation pipeline, the system comprises an airflow control device movably arranged in the simulation pipeline, the airflow control device comprises a cylindrical shell, and the two ends of the shell are each connected with a driving mechanism used for driving the shell to move. The driving mechanism comprises a plurality of driving wheels evenly distributed in the circumferential direction of the shell, the driving wheels can move in the radial direction of the shell, the middle of the shell is fixedly sleeved with an air bag and a lantern ring, two air cylinders are detachably arranged in the shell, one air cylinder communicates with the air bag through a first air pump, and the other air cylinder communicates with the lantern ring through a second air pump. The air bag can be in contact with the inner wall of the simulation pipeline when being opened, the other air bottle is communicated with an air injection channel formed in the lantern ring through a second air pump, and the air injection channel can inject air towards the direction of the main air inlet pipeline. According to the invention, high-flexibility simulation can be carried out on various abnormal ventilation conditions of the coal mine ventilation pipeline by controlling the states of the air bag and the air injection channel.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine ventilation simulation, in particular to a comprehensive simulation system and method for coal mine ventilation ducts. Background Art

[0002] Coal mine ventilation system is a key link in coal mine safety. Therefore, it is particularly important to establish a stable, reliable and simple ventilation system. The variability of coal mine production determines the dynamics of the mine ventilation system. Through simulation experiments, various possible ventilation abnormalities can be studied, so that the correct response plan can be formulated in advance, which can greatly improve the reliability and safety of the ventilation system in the actual production process.

[0003] In the prior art, the simulation experiment of coal mine ventilation ducts mainly involves building a simulation pipeline based on the actual situation of the mine, and then setting multiple valves on the simulation pipeline to simulate ventilation abnormalities such as ventilation obstruction by controlling the opening and opening and closing status of the valves. However, because the positions of the valves are fixed, the scenarios that can be simulated are limited, and it is necessary to change the structure of the simulation pipeline by disassembling and assembling the simulation pipeline to realize simulation experiments for more scenarios, which is very cumbersome. Summary of the invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a comprehensive simulation system and method for coal mine ventilation ducts. By arranging an airflow control device in the simulation pipeline, various abnormal ventilation conditions of the coal mine ventilation ducts can be simulated by controlling the states of the airbag and the jet channel, and the airflow control device can be flexibly moved in the simulation pipeline, and the simulated occurrence positions of various abnormal ventilation conditions are more flexibly adjustable, which can fully meet the needs of simulation experiments.

[0005] In order to achieve the above object, the specific scheme adopted by the present invention is:

[0006] A comprehensive simulation system for coal mine ventilation ducts, including a simulation pipeline, wherein the simulation pipeline includes a main air inlet duct and a main air outlet duct that are interconnected, and the system includes an airflow control device that is movably arranged in the simulation pipeline, the airflow control device includes a cylindrical shell, and each end of the shell is connected to a driving mechanism for driving the shell to move, the driving mechanism includes a plurality of driving wheels evenly distributed along the circumferential direction of the shell, and the driving wheels can move along the radial direction of the shell, the middle part of the shell is fixedly sleeved with an air bag and a ring, and two gas cylinders are detachably arranged inside the shell, one of the gas cylinders is connected to the air bag through a first air pump, and the air bag can contact the inner wall of the simulation pipeline when it is expanded, and the other gas cylinder is connected to a jet channel opened on the ring through a second air pump, and the jet channel can spray jets in the direction of the main air inlet duct.

[0007] Preferably, both ends of the shell are respectively closed by an end plate, and the driving mechanism includes a plurality of support plates evenly distributed along the circumferential direction of the shell, the support plates are slidably connected to the end plates, and the support plates can slide along the radial direction of the shell, the support plates are fixedly connected to a base, and a driving motor is fixedly provided on the base, and the driving motor is used to drive the driving wheel to rotate.

[0008] Preferably, the driving mechanism includes an adjusting rod slidably penetrated through the center of the end plate, the adjusting rod is correspondingly connected to the support plate through a plurality of push rods, and the two ends of the push rod are respectively hinged to the adjusting rod and the support plate, and the end plate is provided with a plurality of slideways extending radially along the shell, the support plates pass through the slideways one by one, and the support plate is fixedly connected to two limit plates respectively located on both sides of the end plate.

[0009] Preferably, a socket extending along the length direction is provided on one end of the adjusting rod extending into the interior of the shell, and an internal thread is provided on the inner wall of the socket, a linkage rod is rotatably provided in the shell, and the linkage rod extends along the axis of the shell, and an insertion rod is coaxially fixedly connected at each end of the linkage rod, the insertion rod is provided with an external thread, and the rotation directions of the external threads on the two insertion rods are opposite, the insertion rods are correspondingly inserted into the sockets, and the internal thread and the external thread are correspondingly matched.

[0010] Preferably, an adjusting motor is fixedly arranged inside the shell, the adjusting motor is drivingly connected to a driving gear, and a driven gear meshing with the driving gear is fixedly sleeved on the linkage rod.

[0011] Preferably, a mounting ring is fixedly sleeved on the outer wall of the shell, a receiving groove is opened on the peripheral side wall of the mounting ring, the airbag is fixedly arranged in the receiving groove, the first air pump is connected to a first air supply pipe, the first air supply pipe passes through the shell and the mounting ring and extends into the receiving groove and is connected to the airbag.

[0012] Preferably, an annular air passage extending along the circumferential direction of the shell is opened on the inner wall of the ring, and the annular air passage is connected with a plurality of jet ports facing the end of the shell, and the annular air passage and the jet ports constitute the jet channel, and the second air pump is connected with a second air supply pipe, and the second air supply pipe is connected with the annular air passage after passing through the shell.

[0013] Preferably, two windows are provided on the shell, and two storage boxes corresponding to and connected to the windows are arranged inside the shell, and the gas cylinders are detachably arranged in the storage boxes one by one, and a cover plate detachably connected to the shell is provided on the outer side of the window, and a lining plate for pressing the gas cylinders in the storage box is fixedly connected to the cover plate.

[0014] Preferably, a main control module is disposed inside the shell, and the main control module includes a controller, and the controller is control-connected with the driving mechanism, the first air pump, and the second air pump.

[0015] A comprehensive simulation method for coal mine ventilation ducts, based on the above-mentioned comprehensive simulation system for coal mine ventilation ducts, the method comprises the following steps:

[0016] Installing the simulated pipeline and placing the airflow control device into the simulated pipeline;

[0017] Driving the airflow control device to move to a first simulation position, and using the first air pump to inflate the airbag until the airbag contacts the inner wall of the simulation pipeline, thereby completing the flow cutoff simulation process;

[0018] The airflow control device is driven to move to the second simulation position, and the second air pump is used to spray air into the jet channel, so that the jet channel sprays air in the direction of the main air inlet duct, thereby completing the tumbling simulation process.

[0019] The present invention can simulate various abnormal ventilation conditions of the coal mine ventilation duct by arranging an airflow control device in the simulation pipeline by controlling the states of the airbag and the jet channel, and the airflow control device can be flexibly moved in the simulation pipeline, and the simulated occurrence positions of various abnormal ventilation conditions are more flexibly adjustable, which can fully meet the needs of simulation experiments, and there is no need to repeatedly disassemble and assemble the simulation pipeline, which can greatly improve the efficiency of the simulation experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural diagram of the simulated pipeline; Figure 2 It is a schematic diagram of the overall structure of the airflow control device; Figure 3 yes Figure 2A magnified view of part A; Figure 4 yes Figure 2 A magnified view of part B; Figure 5 is a schematic diagram of the structure of the deflation control assembly; Figure 6 yes Figure 5 Magnified view of part C.

[0022] Figure numerals: 1-main air inlet duct, 2-main air outlet duct, 3-branch air inlet duct, 4-branch air outlet duct, 5-connecting duct, 6-housing, 7-main control module, 8-mounting ring, 9-air bag, 10-end plate, 11-slide, 12-limiting plate, 13-support plate, 14-hinge, 15-top rod, 16-adjusting rod, 17-base, 18-driving motor, 19-driving wheel, 20-jack, 21-insertion rod, 22-first air supply pipe, 23-first air pump, 24-accommodating Box, 25-gas cylinder, 26-lining plate, 27-cover plate, 28-connecting bolts, 29-battery, 30-linkage rod, 31-driving gear, 32-driven gear, 33-adjusting motor, 34-window, 35-second air pump, 36-second air supply pipe, 37-ring, 38-annular air duct, 39-injection port, 40-electromagnet, 41-bleed hole, 42-sealing pad, 43-permanent magnet rod, 44-moving plate, 45-guide plate, 46-sliding plate, 47-guide groove, 48-spring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figures 1 to 6As shown, a comprehensive simulation system for coal mine ventilation ducts includes a simulation pipeline, and the simulation pipeline includes a main air inlet duct 1 and a main air outlet duct 2 that are interconnected. The system includes an airflow control device that is movably arranged in the simulation pipeline, and the airflow control device includes a cylindrical shell 6, and each end of the shell 6 is connected to a driving mechanism for driving the shell 6 to move, and the driving mechanism includes a plurality of driving wheels 19 evenly distributed along the circumferential direction of the shell 6, and the driving wheel 19 can move along the radial direction of the shell 6, and an air bag 9 and a ring 37 are fixedly sleeved in the middle of the shell 6, and two gas cylinders 25 are detachably arranged inside the shell 6, one of the gas cylinders 25 is connected to the air bag 9 through a first air pump 23, and the air bag 9 can contact the inner wall of the simulation pipeline when it is expanded, and the other gas cylinder 25 is connected to the jet channel opened on the ring 37 through a second air pump 35, and the jet channel can spray in the direction of the main air inlet duct 1.

[0025] When conducting a simulation experiment of a coal mine ventilation duct, a simulation pipeline is first built. In the simulation pipeline, the main air inlet duct 1 is used to simulate the air inlet tunnel, and the main air outlet duct 2 is used to simulate the return air tunnel. In addition to the main air inlet duct 1 and the main air outlet duct 2, several branch air inlet ducts 3 connected to the main air inlet duct 1 and several branch air outlet ducts 4 connected to the main air outlet duct 2 can also be set. In addition, the branch air inlet duct 3 and the branch air outlet duct 4 as well as the main air inlet duct 1 and the main air outlet duct 2 can be connected through a connecting duct 5. After the simulation pipeline is built, the experimental gas is introduced into the main air inlet duct 1 by using an air source to conduct an experiment of normal ventilation conditions. Subsequently, the airflow control device is placed in the simulation pipeline, and the airflow control device is driven by a driving mechanism to move in the simulation pipeline to conduct an experiment of abnormal ventilation conditions. Specifically, after the airflow control device moves to the required position, the gas in the first gas cylinder 25 can be transported to the airbag 9 through the first air pump 23, so that the airbag 9 gradually changes from the contracted state to the expanded state. During the expansion process, the airbag 9 will gradually reduce the ventilation area of ​​the simulated pipeline, thereby simulating the abnormal ventilation condition of the local poor circulation of the coal mine ventilation duct. When the airbag 9 is expanded to contact the inner wall of the simulated pipeline, the simulated pipeline will be completely cut off, thereby simulating the abnormal ventilation condition of the coal mine ventilation duct being completely cut off. After the simulation of the abnormal ventilation condition of the local poor circulation and complete cutoff of the coal mine ventilation duct is completed, the first air pump 23 can be used to pump the gas in the airbag 9 back into the first gas cylinder 25. In addition, the gas in the second gas cylinder 25 can be transported to the sneeze channel through the second air pump 35, and then sprayed in the direction of the main air inlet duct 1 through the jet channel, thereby simulating the abnormal ventilation condition of the coal mine ventilation duct due to gas protrusion or explosion and other reasons.

[0026] The present invention can simulate various abnormal ventilation conditions of the coal mine ventilation duct by arranging an airflow control device in the simulation pipeline by controlling the states of the airbag 9 and the jet channel, and the airflow control device can be flexibly moved in the simulation pipeline, and the simulated occurrence positions of various abnormal ventilation conditions are more flexibly adjustable, which can fully meet the needs of simulation experiments, and there is no need to repeatedly disassemble and assemble the simulation pipeline, which can greatly improve the efficiency of the simulation experiment.

[0027] Because the airflow control device needs to move in the simulated pipeline, in order to expand the applicable scope of the airflow control device and conduct simulation experiments on simulated pipelines of different sizes, the two ends of the shell 6 are closed by an end plate 10, and the driving mechanism includes a plurality of support plates 13 evenly distributed along the circumferential direction of the shell 6, the support plates 13 are slidably connected to the end plates 10, and the support plates 13 can slide along the radial direction of the shell 6, and the support plates 13 are fixedly connected to the base 17, and the base 17 is fixedly provided with a driving motor 18, and the driving motor 18 is used to drive the driving wheel 19 to rotate. After the airflow control device is placed in the simulated pipeline, the driving wheel 19 can be driven to move synchronously by moving the position of the support plate 13, and because the support plate 13 moves along the radial direction of the shell 6, the driving wheel 19 can be moved close to or away from the inner wall of the simulated pipeline by moving the support plate 13. When the driving wheel 19 contacts the inner wall of the simulated pipeline, the driving wheel 19 rotates to smoothly drive the airflow control device to move in the simulated pipeline. Through this structure, the airflow control device can be adapted to simulation pipelines of different sizes, thereby eliminating the need to manufacture airflow control devices of different sizes in different experimental scenarios, thereby reducing the cost of simulation experiments.

[0028] In order to adjust the position of the support plate 13 more simply and conveniently, the driving mechanism includes an adjusting rod 16 that slides through the center of the end plate 10, and the adjusting rod 16 is correspondingly connected to the support plate 13 through a plurality of push rods 15, and the two ends of the push rod 15 are respectively hinged to the adjusting rod 16 and the support plate 13, and the end plate 10 is provided with a plurality of slideways 11 extending along the radial direction of the shell 6, and the support plates 13 pass through the slideways 11 one by one, and the support plate 13 is fixedly connected to two limit plates 12 located on both sides of the end plate 10. After the airflow control device is placed in the simulation pipeline, the adjusting rod 16 is moved along the axial direction of the shell 6. During the movement, the adjusting rod 16 can drive the push rod 15 to move synchronously, so that the end of the push rod 15 hinged with the support plate 13 is close to or away from the adjusting rod 16, and then drives the support plate 13 to be close to or away from the inner wall of the simulation pipeline. The slideway 11 can limit the moving direction of the support plate 13, and fully ensure that the support plate 13 can only move along the radial direction of the shell 6. The two limit plates 12 are respectively limited on both sides of the end plate 10 to prevent the push rod 15 from moving synchronously with the adjustment rod 16 along the axial direction of the housing 6, thereby ensuring that the push rod 15 can push the support plate 13. Through this structure, it is only necessary to drive the adjustment rod 16 to move to drive all the support plates 13 to move synchronously, which is easier to control. It should be noted that the two ends of the push rod 15 are connected to the adjustment rod 16 and the support plate 13 through a hinge 14, and the hinge 14 is a conventional connector and will not be described here.

[0029] In order to further simplify the control process of the airflow control device, a plug hole 20 extending along the length direction is provided on one end of the adjustment rod 16 extending into the shell 6, and an internal thread is provided on the inner wall of the plug hole 20. A linkage rod 30 is rotatably provided in the shell 6, and the linkage rod 30 extends along the axis of the shell 6. A plug rod 21 is coaxially fixedly connected to each end of the linkage rod 30. The plug rod 21 is provided with an external thread, and the rotation directions of the external threads on the two plug rods 21 are opposite. The plug rods 21 are correspondingly inserted into the plug hole 20, and the internal threads and the external threads are correspondingly matched. After the airflow control device is placed in the simulation pipeline, the two plug rods 21 are driven to rotate by rotating the linkage rod 30. Because the rotation directions of the external threads on the two plug rods 21 are opposite, the two plug rods 21 will drive the two adjustment rods 16 to move in opposite directions during the same-direction rotation, even if the two adjustment rods 16 move toward the outside of the shell 6 or toward the inside of the shell 6 at the same time. Based on this structure, the movement of the two adjustment rods 16 can be controlled by only driving the linkage rod 30 to rotate, which is simpler and faster.

[0030] In order to realize remote control of the linkage rod 30 and further simplify the adjustment process of the driving mechanism, an adjustment motor 33 is fixedly arranged inside the shell 6, and the adjustment motor 33 is driven and connected to the driving gear 31. A driven gear 32 meshing with the driving gear 31 is fixedly sleeved on the linkage rod 30.

[0031] The specific arrangement of the airbag 9 is as follows: a mounting ring 8 is fixedly sleeved on the outer wall of the housing 6, a receiving groove is provided on the peripheral side wall of the mounting ring 8, the airbag 9 is fixedly arranged in the receiving groove, the first air pump 23 is connected with a first air supply pipe 22, the first air supply pipe 22 passes through the housing 6 and the mounting ring 8 and then extends into the receiving groove and is connected with the airbag 9. By providing the mounting ring 8 and the receiving groove, the process of the airbag 9 expanding can be controlled, so that the airbag 9 expands preferentially to the periphery of the housing 6 when being expanded, thereby ensuring that the airbag 9 can contact the inner wall of the simulated pipeline.

[0032] The specific structure of the jet channel is as follows: an annular air channel 38 extending along the circumferential direction of the housing 6 is opened on the inner side wall of the collar 37, the annular air channel 38 is connected with a plurality of jet ports 39 facing the end of the housing 6, the annular air channel 38 and the jet ports 39 constitute the jet channel, the second air pump 35 is connected with the second air supply pipe 36, and the second air supply pipe 36 is connected with the annular air channel 38 after passing through the housing 6. The jet channel can first open the annular air channel 38 on the inner wall of the collar 37, and then process a plurality of jet ports 39 connected with the annular air channel 38 from the end of the collar 37, the processing process is simpler, and the collar 37 is an integrated structure with higher strength.

[0033] Considering that the capacity of the gas cylinder 25 is limited, especially the gas cylinder connected to the jet channel, because the gas cannot be recovered, it needs to be replaced after a period of use. In order to facilitate the replacement of the gas cylinder 9, two windows 34 are provided on the shell 6, and two receiving boxes 24 corresponding to the windows 34 are provided inside the shell 6. The gas cylinders 25 are detachably arranged in the receiving boxes 24 one by one. The outer side of the window 34 is provided with a cover plate 27 detachably connected to the shell 6, and the cover plate 27 is connected to the shell 6 through a plurality of connecting bolts 28. The cover plate 27 is fixedly connected to the liner plate 26 for pressing the gas cylinder 25 in the receiving box 24. When the gas storage capacity of the gas cylinder 9 is insufficient, the cover plate 27 can be removed, the gas cylinder 25 can be replaced, and then the cover plate 27 can be reinstalled, and the gas cylinder 25 can be pressed by the liner plate 26 to ensure that the gas cylinder 25 can be smoothly matched with the first air pump 23 or the second air pump 35. It should also be noted that a bottle opening assembly capable of opening the gas cylinder 25 should be provided on the side wall of the containing box 24, such as a hollow needle connected to the first air pump 23 or the second air pump 35, and a one-way valve capable of being opened after being squeezed by the hollow needle is provided on the gas cylinder 25. The coordination of the hollow needle and the one-way valve belongs to conventional technology and will not be elaborated here.

[0034] In order to further expand the abnormal ventilation conditions that can be simulated by the present invention, a plurality of air leakage holes 41 are also provided on the simulation pipeline, and an air leakage control component capable of opening or closing the air leakage hole 41 is provided in the air leakage hole 41. The air leakage control component includes a permanent magnet rod 43 passing through the air leakage hole 41, and one end of the permanent magnet rod 43 extending into the simulation pipeline is fixedly connected to a sealing gasket 42, and one end of the permanent magnet rod 43 extending out of the simulation pipeline is fixedly connected to a moving plate 44, and a spring 48 is connected between the moving plate 44 and the outer wall of the simulation pipeline, and the spring 48 is located on the peripheral side of the air leakage hole 41. An electromagnet 40 is provided on the outer wall of the housing 6. During the movement of the airflow control device, the permanent magnet rod 43 can be attracted by the electromagnet 40 to move into the simulation pipeline. During the process, the permanent magnet rod 43 pushes the sealing gasket 42 to open the air leakage hole 41, so that the experimental gas entering the simulation pipeline can be leaked through the air leakage hole 41, thereby realizing the simulation of the abnormal ventilation conditions of local leakage.

[0035] Furthermore, the air leakage hole 41 is set as a stepped hole, and the sealing gasket 42 can enter the air leakage hole 41 to close the air leakage hole 41, and its inner surface can be flush with the inner surface of the simulated pipe to avoid affecting the movement of the airflow control device.

[0036] In order to control the moving direction of the sealing gasket 42 to avoid the sealing gasket 42 being unable to successfully close the air leakage hole 41 after the electromagnet 40 is powered off, thereby causing the air leakage hole 41 to always be in an open state and interfering with the simulation experiments of several other abnormal ventilation conditions, the air leakage control component also includes at least one guide plate 45 fixedly arranged on the outer wall of the simulation pipeline, and a guide groove 47 extending radially along the simulation pipeline is opened on the guide plate 45. The movable plate 44 is fixedly connected to a sliding plate 46, and the sliding plate 46 is slidably arranged in the guide groove 47, so that the moving direction of the movable plate 44 is controlled by utilizing the cooperation of the guide groove 47 and the sliding plate 46, thereby realizing the control of the moving direction of the permanent magnet rod 43 and the sealing gasket 42, and ensuring that the sealing gasket 42 can smoothly open or close the air leakage hole 41.

[0037] In order to realize the remote control simulation experiment, the housing 6 is provided with a main control module 7 and a battery 29. The main control module 7 includes a controller, and the controller is controlled and connected with the driving mechanism, the first air pump 23, the second air pump 35 and the electromagnet 40. The main control module 7 can be based on an ARM architecture processor, and can be wirelessly connected with a host computer through technologies such as WIFI and Bluetooth, so that the host computer can be used to remotely control the airflow control device, further simplifying the entire simulation experiment process. The specific structure of the main control module 7 and the connection method with other components are mature existing technologies, which will not be repeated here.

[0038] The present invention further provides a method for comprehensive simulation of coal mine ventilation ducts. Based on the above-mentioned comprehensive simulation system for coal mine ventilation ducts, the method includes S1 to S3.

[0039] S1. Install the simulated pipeline and place the airflow control device into the simulated pipeline.

[0040] S2, driving the airflow control device to move to the first simulation position, and using the first air pump 23 to inflate the airbag 9 until the airbag 9 contacts the inner wall of the simulation pipeline, completing the interception simulation process.

[0041] S3, driving the airflow control device to move to the second simulation position, and using the second air pump 35 to spray air into the jet channel, so that the jet channel sprays air in the direction of the main air inlet duct 1, completing the tumbling simulation process. In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A comprehensive simulation system for coal mine ventilation ducts, comprising a simulation pipeline, wherein the simulation pipeline comprises a main air inlet duct (1) and a main air outlet duct (2) which are interconnected, characterized in that: The system comprises an airflow control device movably arranged in the simulation pipeline, the airflow control device comprising a cylindrical shell (6), each of the two ends of the shell (6) being connected to a driving mechanism for driving the shell (6) to move, the driving mechanism comprising a plurality of driving wheels (19) evenly distributed along the circumferential direction of the shell (6), and the driving wheels (19) are capable of moving along the radial direction of the shell (6), the middle part of the shell (6) is fixedly sleeved with an air bag (9) and a collar (37), two air cylinders (25) are detachably arranged inside the shell (6), one of the air cylinders (25) is connected to the air bag (9) through a first air pump (23), and the air bag (9) can contact the inner wall of the simulation pipeline when it is expanded, and the other air cylinder (25) is connected to the jet channel opened on the collar (37) through a second air pump (35), and the jet channel can jet in the direction of the main air inlet duct (1).

2. A coal mine ventilation duct comprehensive simulation system as claimed in claim 1, characterized in that: Both ends of the shell (6) are closed by an end plate (10), and the driving mechanism comprises a plurality of support plates (13) evenly distributed along the circumferential direction of the shell (6). The support plates (13) are slidably connected to the end plates (10), and the support plates (13) can slide along the radial direction of the shell (6). The support plates (13) are fixedly connected to a base (17), and a driving motor (18) is fixedly arranged on the base (17). The driving motor (18) is used to drive the driving wheel (19) to rotate.

3. A coal mine ventilation duct comprehensive simulation system as claimed in claim 2, characterized in that: The driving mechanism comprises an adjusting rod (16) slidably arranged at the center of the end plate (10), the adjusting rod (16) being correspondingly connected to the support plate (13) through a plurality of push rods (15), and the two ends of the push rod (15) are respectively hinged to the adjusting rod (16) and the support plate (13), the end plate (10) is provided with a plurality of slideways (11) extending along the radial direction of the shell (6), the support plates (13) pass through the slideways (11) one by one, and the support plate (13) is fixedly connected to two limit plates (12) respectively located on both sides of the end plate (10).

4. A coal mine ventilation duct comprehensive simulation system as claimed in claim 3, characterized in that: The end of the adjusting rod (16) extending into the shell (6) is provided with a socket (20) extending in the length direction, and the inner wall of the socket (20) is provided with an internal thread. A linkage rod (30) is rotatably provided in the shell (6), and the linkage rod (30) extends along the axis of the shell (6). The two ends of the linkage rod (30) are coaxially fixedly connected with an insertion rod (21), and the insertion rod (21) is provided with an external thread, and the rotation directions of the external threads on the two insertion rods (21) are opposite. The insertion rods (21) are correspondingly inserted into the socket (20), and the internal thread and the external thread are correspondingly matched.

5. A coal mine ventilation duct comprehensive simulation system as claimed in claim 4, characterized in that: An adjusting motor (33) is fixedly arranged inside the housing (6), and the adjusting motor (33) is drivingly connected to a driving gear (31). A driven gear (32) meshing with the driving gear (31) is fixedly sleeved on the linkage rod (30).

6. A coal mine ventilation duct comprehensive simulation system as claimed in claim 1, characterized in that: A mounting ring (8) is fixedly sleeved on the outer wall of the shell (6), a receiving groove is provided on the peripheral side wall of the mounting ring (8), the airbag (9) is fixedly arranged in the receiving groove, the first air pump (23) is connected to a first air supply pipe (22), the first air supply pipe (22) passes through the shell (6) and the mounting ring (8), extends into the receiving groove and is connected to the airbag (9).

7. A coal mine ventilation duct comprehensive simulation system as claimed in claim 1, characterized in that: An annular air passage (38) extending along the circumferential direction of the shell (6) is provided on the inner side wall of the collar (37); the annular air passage (38) is connected to a plurality of jet ports (39) facing the end of the shell (6); the annular air passage (38) and the jet ports (39) constitute the jet channel; the second air pump (35) is connected to a second air supply pipe (36); the second air supply pipe (36) passes through the shell (6) and is connected to the annular air passage (38).

8. A coal mine ventilation duct comprehensive simulation system as claimed in claim 1, characterized in that: The shell (6) is provided with two windows (34), the shell (6) is provided with two receiving boxes (24) corresponding to and connected with the windows (34), the gas cylinders (25) are detachably arranged in the receiving boxes (24) one by one, the outer side of the window (34) is provided with a cover plate (27) detachably connected to the shell (6), and the cover plate (27) is fixedly connected with a lining plate (26) for pressing the gas cylinders (25) in the receiving box (24).

9. A coal mine ventilation duct comprehensive simulation system as claimed in claim 1, characterized in that: A main control module (7) is arranged inside the housing (6), and the main control module (7) comprises a controller, and the controller is controllably connected to the driving mechanism, the first air pump (23) and the second air pump (35).

10. A comprehensive simulation method for coal mine ventilation ducts, characterized in that: Based on a comprehensive simulation system for coal mine ventilation ducts as described in any one of claims 1 to 9, the method comprises the following steps: Installing the simulated pipeline and placing the airflow control device into the simulated pipeline; The airflow control device is driven to move to a first simulation position, and the airbag (9) is inflated by the first air pump (23) until the airbag (9) contacts the inner wall of the simulation pipeline, thereby completing the flow cutoff simulation process; The airflow control device is driven to move to a second simulation position, and the second air pump (35) is used to spray air into the jet channel, so that the jet channel sprays air in the direction of the main air inlet duct (1), thereby completing the tumbling simulation process.

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