Dust falling device

Abstract

The invention provides a dust falling device which comprises a fixing frame and a dust falling device, the fixing frame is used for being fixed to a heading machine, the fixing frame is provided with a ventilation channel, an air inlet and a water outlet, the air inlet and the water outlet are both communicated with the ventilation channel, the air inlet is formed in one side of the ventilation channel, and the water outlet is formed in the other side of the ventilation channel; the injection barrel is arranged in the ventilation channel, the injection barrel is provided with an inlet and an outlet which are oppositely arranged, the inlet communicates with the ventilation channel, and the outlet communicates with the water outlet; the dust falling structure is arranged in the ventilation channel, the dust falling structure is arranged at the inlet, and the dust falling structure is used for spraying jet flow; and the water conveying channel is communicated with the dust falling structure. By means of the technical scheme, the problem that in the prior art, the dust removal effect of a dust falling structure is poor can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of dust suppression devices, and in particular to a dust suppression device. Background Art

[0002] Among them, when the tunnel boring machine is excavating in the coal mine, the cutting head of the tunnel boring machine will generate a lot of dust when cutting the coal and rock. During the construction process, the dust needs to be controlled and managed to avoid dust pollution of the entire working space of the working face and ensure the health of the tunnel boring machine driver and other workers on the working face.

[0003] In the prior art, during the dust reduction process, a dust reduction structure is usually set in the cutting head, and the dust reduction structure can produce spray. However, during the process of cutting the coal rock, the cutting head will produce extrusion and friction, which will cause the nozzle of the dust reduction structure to deform or even be damaged, thereby affecting the dust removal effect of the dust reduction structure. Summary of the invention

[0004] The invention provides a dust removal device to solve the problem that the dust removal effect of the dust removal structure in the prior art is poor.

[0005] The present invention provides a dust reduction device, comprising: a fixed frame, which is used to be fixed on a tunnel boring machine, the fixed frame having a ventilation channel, an air inlet and a water outlet, the air inlet and the water outlet are both connected to the ventilation channel, the air inlet is arranged on one side of the ventilation channel, and the water outlet is arranged on the other side of the ventilation channel; an ejector tube, which is arranged in the ventilation channel, the ejector tube has an inlet and an outlet which are relatively arranged, the inlet is connected to the ventilation channel, and the outlet is connected to the water outlet; a dust reduction structure, which is arranged in the ventilation channel, and the dust reduction structure is arranged at the inlet, and the dust reduction structure is used to eject a jet; a water delivery channel, which is connected to the dust reduction structure.

[0006] Furthermore, the fixed frame is used to be arranged on both sides and above the tunnel boring machine, and the fixed frame has multiple water outlets, and the multiple water outlets are arranged at intervals along the extension direction of the fixed frame. The dust reduction device includes multiple ejection tubes and multiple dust reduction structures, and the multiple ejection tubes and multiple dust reduction structures are arranged in a one-to-one correspondence.

[0007] Furthermore, the liquid pressure in the water delivery channel is greater than 4 MPa, and a plurality of air inlets are arranged on the fixing frame, and the plurality of air inlets are arranged at intervals along the extension direction of the ventilation channel.

[0008] Furthermore, the fixed frame includes: a fixed plate, on which an air inlet is arranged; a shell, a cover is arranged on the fixed plate, the shell is located on the side of the fixed plate facing the forward direction of the tunnel boring machine, a ventilation channel is provided between the shell and the fixed plate, and a water outlet is provided on the side of the shell away from the fixed plate.

[0009] Furthermore, the fixing frame is an arc-shaped structure.

[0010] Furthermore, the ejector tube gradually deviates from the center of the fixing frame in a direction approaching the water outlet.

[0011] Furthermore, the angle between the ejector tube and the axis of the fixing frame is set between 30° and 40°.

[0012] Furthermore, the water delivery channel extends along the extension direction of the fixing frame, and a plurality of water delivery ports are arranged on the water delivery channel. The plurality of water delivery ports are arranged in one-to-one correspondence with the plurality of dust reduction structures, and the dust reduction structures are connected with the water delivery ports.

[0013] Furthermore, the dust reduction structure includes: a seat body, which is fixedly connected to the water delivery port; and a nozzle, which is detachably arranged on the seat body.

[0014] Furthermore, the fixing frame also includes: a mounting plate, which is used to adapt to the structure of the tunnel boring machine, and a plurality of connecting holes are arranged on the mounting plate, and the mounting plate is detachably connected to the tunnel boring machine through the connecting holes and the locking member.

[0015] By applying the technical solution of the present invention, the fixed frame is fixed on the tunnel boring machine, and an ejector tube and a dust reduction structure are arranged in the ventilation channel of the fixed frame. The dust reduction structure is arranged at the opening of the ejector tube, and the outlet of the ejector tube is connected to the water outlet of the fixed frame, and the water supply channel can provide water flow for the dust reduction structure. In this way, the water mist jet generated by the dust reduction structure can surround and cover the dust-producing area of ​​the cutting head, and control the dust generated by the cutting head in the spray area formed by the water mist jet. The mist particles and dust particles are combined and settled to achieve the dust reduction effect, so that the dust can be prevented from spreading to a wider range. In addition, when the dust reduction structure sprays, a negative pressure area will be formed around the fixed frame, and the unsettled dust will not escape and spread quickly, so that the unsettled dust can be sealed and controlled. If the dust spreads to the rear side of the fixed frame, under the action of the negative pressure area, the dust will enter the ventilation channel through the air inlet, and then enter the ejector tube through the inlet, and finally settle in combination with the water mist. Therefore, the above structure can effectively control dust, avoid dust pollution in the working space, ensure the health of workers, and facilitate dust removal and the normal progress of subsequent operations. At the same time, since the dust reduction structure is arranged on the outside of the cutting head and the dust reduction structure is arranged in the ejector tube, the dust reduction structure can be protected to avoid extrusion and friction of the dust reduction structure, thereby avoiding deformation and damage of the dust removal structure, and preventing dust and other impurities from entering the dust reduction structure, thereby ensuring that the dust reduction structure can spray the jet normally, which can increase the service life of the dust removal structure, thereby ensuring the dust removal effect of the dust removal structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of a dust suppression device provided according to an embodiment of the present invention is shown;

[0018] Figure 2 Shows Figure 1 Sectional view in the AA direction;

[0019] Figure 3 Shows Figure 2 A partial enlarged view of point A in the middle.

[0020] The above drawings include the following reference numerals:

[0021] 10. Fixed frame;

[0022] 11. Ventilation channel;

[0023] 12. Air inlet;

[0024] 13. Water outlet;

[0025] 14. Fixed plate;

[0026] 15. Shell;

[0027] 20. Ejector tube;

[0028] 21. Import;

[0029] 22. Export;

[0030] 30. Dust reduction structure;

[0031] 31. Base body;

[0032] 32. Nozzle;

[0033] 40. Water delivery channel;

[0034] 50. Water inlet. DETAILED DESCRIPTION

[0035] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0036] like Figures 1 to 3As shown, the present application provides a dust suppression device, which includes a fixed frame 10, an ejector tube 20, a dust suppression structure 30 and a water delivery channel 40. The fixed frame 10 is used to be fixed on a tunnel boring machine. In the present application, the fixed frame 10 is fixed on the cutting head of the tunnel boring machine. The fixed frame 10 has a ventilation channel 11, an air inlet 12 and a water outlet 13. The air inlet 12 and the water outlet 13 are both connected to the ventilation channel 11. The air inlet 12 is arranged on one side of the ventilation channel 11, and the water outlet 13 is arranged on the other side of the ventilation channel 11. The ejector tube 20 is arranged in the ventilation channel 11. The ejector tube 20 has an inlet 21 and an outlet 22 arranged opposite to each other. The inlet 21 is connected to the ventilation channel 11, and the outlet 22 is connected to the water outlet 13. The dust suppression structure 30 is arranged in the ventilation channel 11, and the dust suppression structure 30 is arranged at the inlet 21. The dust suppression structure 30 is used to spray a jet. The water delivery channel 40 is connected to the dust suppression structure 30. In the present application, the forward direction of the tunnel boring machine is referred to as the front side, and correspondingly, the backward direction of the tunnel boring machine is referred to as the rear side.

[0037] By applying the technical solution of the present application, the fixed frame 10 is fixed on the tunnel boring machine, and the ventilation channel 11 of the fixed frame 10 is provided with an ejector tube 20 and a dust reduction structure 30, the dust reduction structure 30 is arranged at the opening of the ejector tube 20, the outlet 22 of the ejector tube 20 is connected with the water outlet 13 of the fixed frame 10, and the water delivery channel 40 can provide water flow for the dust reduction structure 30. In this way, the water mist jet generated by the dust reduction structure 30 can surround and cover the dust-generating area of ​​the cutting head, control the dust generated by the cutting head within the spray area formed by the water mist jet, and the mist particles and dust particles are combined and precipitated to achieve the dust reduction effect, thereby preventing the dust from spreading to a wider range. Moreover, when the dust reduction structure 30 sprays, a negative pressure zone will be formed around the fixed frame 10, and the unsettled dust will not escape and spread quickly, so that the unsettled dust can be sealed and controlled. If the dust spreads to the rear side of the fixed frame 10, under the action of the negative pressure zone, the dust will enter the ventilation channel 11 through the air inlet 12, and then enter the ejection tube 20 through the inlet 21, and finally settle with the water mist. Therefore, the above structure can effectively control the dust, avoid dust pollution of the working space, ensure the health of the staff, and facilitate the normal progress of dust removal and subsequent operations. At the same time, since the dust reduction structure 30 is arranged on the outside of the cutting head and the dust reduction structure 30 is arranged in the ejector tube 20, the dust reduction structure 30 can be protected to prevent the dust reduction structure 30 from being squeezed and rubbed, thereby preventing the dust removal structure from being deformed and damaged, and preventing impurities such as dust from entering the dust reduction structure 30, thereby ensuring that the dust reduction structure 30 can normally spray the jet, which can increase the service life of the dust removal structure, thereby ensuring the dust removal effect of the dust removal structure.

[0038] like Figure 1As shown, the fixed frame 10 is used to be arranged on both sides and above the tunnel boring machine. The fixed frame 10 has a plurality of water outlets 13, and the plurality of water outlets 13 are arranged at intervals along the extension direction of the fixed frame 10. The dust reduction device includes a plurality of ejector tubes 20 and a plurality of dust reduction structures 30, and the plurality of ejector tubes 20 and the plurality of dust reduction structures 30 are arranged one by one.

[0039] With such arrangement, the water mist jets sprayed by the dust reduction structure 30 can fully cover the dust-generating areas on the left and right sides of the cutting head and above, further preventing dust diffusion and ensuring the dust settling effect, thereby ensuring the dust reduction effect of the dust reduction device.

[0040] Specifically, the liquid pressure in the water delivery channel 40 is greater than 4 MPa. In the present application, a water inlet 50 is provided on the fixing frame 10, and the water inlet 50 is connected to the water delivery channel 40. When the dust suppression device is working, high-pressure water greater than 4 MPa is connected to the water inlet 50. Such a configuration can ensure that a negative pressure zone is formed around the fixing frame 10, and ensure the effect of controlling dust diffusion in the negative pressure zone.

[0041] The fixing frame 10 is provided with a plurality of air inlets 12 , and the plurality of air inlets 12 are arranged at intervals along the extension direction of the ventilation channel 11 .

[0042] Such a configuration can ensure the smooth flow of dust into the ventilation passage 11 , while increasing the amount of dust flowing from the rear side of the fixing frame 10 into the ventilation passage 11 , further preventing dust diffusion and improving the dust reduction effect of the dust reduction structure 30 .

[0043] like Figure 2 As shown, the fixing frame 10 includes a fixing plate 14 and a shell 15. The fixing plate 14 is provided with an air inlet 12. The shell 15 is covered on the fixing plate 14, and the shell 15 is located on the side of the fixing plate 14 facing the forward direction of the tunnel boring machine, and a ventilation channel 11 is provided between the shell 15 and the fixing plate 14, and a water outlet 13 is provided on the side of the shell 15 away from the fixing plate 14.

[0044] Such arrangement facilitates the assembly of the fixing frame 10 , facilitates the processing of the air inlet 12 and the water outlet 13 , and facilitates the arrangement of the dust removal structure and the ejector tube 20 in the ventilation channel 11 .

[0045] like Figure 1 As shown, the fixing frame 10 is an arc-shaped structure. In the present application, the fixing frame 10 is arranged at the root of the cutting head.

[0046] In this way, the fixing frame 10 can be adapted to the structure of the cutting head, and at the same time, it can prevent the fixing frame 10 from causing harm to the workers during the installation and fixing process, and prevent the fixing frame 10 from interfering with the work of the cutting head and the tunnel. Therefore, the above structure can ensure that the excavation work of the cutting head and the dust removal work of the dust reduction device can be carried out normally.

[0047] Furthermore, the ejector tube 20 gradually deviates from the center of the fixing frame 10 in a direction approaching the water outlet 13 .

[0048] Such an arrangement can increase the range of the spray area and the negative pressure area, thereby ensuring the effect of combining and settling dust with water mist, and at the same time further avoiding the spread of dust, facilitating subsequent dust removal work.

[0049] The angle α between the axis of the ejector tube 20 and the fixing frame 10 is set between 30° and 40°.

[0050] In this way, when the angle α between the ejector tube 20 and the axis of the fixed frame 10 is less than 30°, the angle α between the ejector tube 20 and the axis of the fixed frame 10 is too small, resulting in the spray area and the negative pressure area being too small, so that the dust cannot be effectively surrounded, reducing the dust reduction effect of the dust reduction device. When the angle α between the ejector tube 20 and the axis of the fixed frame 10 is greater than 40°, the angle α between the ejector tube 20 and the axis of the fixed frame 10 is too large, the spray area and the negative pressure area are too large, the water mist concentration in the spray area is reduced, the dust is not easy to combine with the water mist, and the negative pressure area cannot effectively prevent the dust from spreading, thereby reducing the dust reduction effect of the dust reduction device. Therefore, in the present application, the angle α between the ejector tube 20 and the axis of the fixed frame 10 is set between 30° and 40°, which can ensure that the dust is effectively surrounded, and at the same time facilitate the dust and water mist to settle together, and the negative pressure area can prevent the dust from spreading, thereby improving the dust reduction effect of the dust reduction device.

[0051] Optionally, the angle α between the ejector tube 20 and the axis of the fixing frame 10 can be set to 30°, 35° or 40°. In the present application, the angle α between the ejector tube 20 and the axis of the fixing frame 10 is set to 30°.

[0052] Furthermore, in the present application, the dust reduction structure 30 is arranged at an angle, and the dust reduction structure 30 and the ejection tube 20 are arranged coaxially.

[0053] Specifically, the water delivery channel 40 extends along the extension direction of the fixing frame 10 , and a plurality of water delivery ports are provided on the water delivery channel 40 . The plurality of water delivery ports are provided in one-to-one correspondence with the plurality of dust reduction structures 30 , and the dust reduction structures 30 are connected with the water delivery ports.

[0054] Such a configuration makes it easy to arrange the water delivery channel 40 , avoid interference between the water delivery channel 40 and the fixing frame 10 , and at the same time facilitates providing water flow for the dust reduction structure 30 .

[0055] The dust reduction structure 30 includes a seat body 31 and a nozzle 32. The seat body 31 is fixedly connected to the water delivery port. The nozzle 32 is detachably arranged on the seat body 31. In the present application, the water delivery channel 40 is arranged in the ventilation channel 11.

[0056] Furthermore, in the present application, the seat body 31 is welded and fixed to the water delivery channel 40. Such a configuration can ensure the stability of the connection between the seat body 31 and the water delivery channel 40 and prevent liquid leakage. In addition, the nozzle 32 is threadedly connected to the seat body 31. Such a configuration facilitates the installation and removal of the nozzle 32, and the dust reduction structure 30 has a simple structure and is easy to assemble.

[0057] Specifically, the fixing frame 10 also includes a mounting plate, which is used to match the structure of the tunnel boring machine. The mounting plate is provided with a plurality of connection holes, and the mounting plate is detachably connected to the tunnel boring machine through the connection holes and the locking member. Such a configuration facilitates the processing of the fixing frame 10 and the mounting frame. Among them, in the present application, the locking member is a bolt, and such a configuration facilitates the assembly of the mounting plate and the tunnel boring machine, and is easy to operate.

[0058] Specifically, in the present application, the mounting plate is an arc-shaped structure, and the mounting plate is arranged on the inner side of the fixing plate 14. Such arrangement facilitates the installation of the mounting plate and the cutting head.

[0059] Therefore, the above structure is adopted, the fixed frame 10 is fixed on the tunnel boring machine, and the ventilation channel 11 of the fixed frame 10 is provided with an ejector tube 20 and a dust reduction structure 30, the dust reduction structure 30 is arranged at the opening of the ejector tube 20, the outlet 22 of the ejector tube 20 is connected to the water outlet 13 of the fixed frame 10, and the water supply channel 40 can provide water flow for the dust reduction structure 30.

[0060] With such an arrangement, the water mist jet generated by the dust reduction structure 30 can surround and cover the dust generating area of ​​the cutting head, and control the dust generated by the cutting head within the spray area formed by the water mist jet. The mist particles and dust particles combine and settle to achieve the dust reduction effect, thereby preventing the dust from spreading to a larger range.

[0061] Furthermore, when the dust reduction structure 30 sprays, a negative pressure zone is formed around the fixing frame 10, and the unsettled dust will not escape and spread quickly, so the unsettled dust can be sealed and controlled.

[0062] If the dust spreads to the rear side of the fixing frame 10, under the action of the negative pressure area, the dust will enter the ventilation channel 11 through the air inlet 12, then enter the ejector tube 20 through the inlet 21, and finally settle together with the water mist.

[0063] Therefore, by adopting the above structure, dust can be effectively controlled, dust pollution of the working space can be avoided, the health of the workers can be ensured, and the dust removal work and the normal progress of subsequent operations can be facilitated.

[0064] At the same time, since the dust reduction structure 30 is arranged on the outside of the cutting head and the dust reduction structure 30 is arranged in the ejector tube 20, the dust reduction structure 30 can be protected to prevent the dust reduction structure 30 from being squeezed and rubbed, thereby preventing the dust removal structure from being deformed and damaged, and preventing impurities such as dust from entering the dust reduction structure 30, thereby ensuring that the dust reduction structure 30 can normally spray the jet, which can increase the service life of the dust removal structure, thereby ensuring the dust removal effect of the dust removal structure.

[0065] At the same time, since the fixing frame 10 is provided with a plurality of water outlets 13 and a plurality of air inlets 12 , the dust reduction effect of the dust reduction device and the smoothness of the dust-laden airflow flowing into the ventilation passage 11 can be ensured.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0068] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0069] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0070] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dust suppression device, characterized in that: include: A fixing frame (10), the fixing frame (10) being used to be fixed on a roadheader, the fixing frame (10) comprising a ventilation channel (11), an air inlet (12) and a water outlet (13), the air inlet (12) and the water outlet (13) both being in communication with the ventilation channel (11), the air inlet (12) being arranged on one side of the ventilation channel (11), and the water outlet (13) being arranged on the other side of the ventilation channel (11); An ejector tube (20) is arranged in the ventilation channel (11), the ejector tube (20) having an inlet (21) and an outlet (22) arranged opposite to each other, the inlet (21) is communicated with the ventilation channel (11), and the outlet (22) is communicated with the water outlet (13); A dust reduction structure (30) is arranged in the ventilation passage (11), and the dust reduction structure (30) is arranged at the inlet (21), and the dust reduction structure (30) is used to eject a jet; The water delivery channel (40) is in communication with the dust reduction structure (30).

2. The dust suppression device according to claim 1, characterized in that: The fixed frame (10) is used to surround the two sides and the top of the tunnel boring machine, the fixed frame (10) has a plurality of water outlets (13), and the plurality of water outlets (13) are arranged at intervals along the extension direction of the fixed frame (10). The dust reduction device comprises a plurality of ejector tubes (20) and a plurality of dust reduction structures (30), and the plurality of ejector tubes (20) and the plurality of dust reduction structures (30) are arranged in a one-to-one correspondence.

3. The dust suppression device according to claim 1, characterized in that: The liquid pressure in the water delivery channel (40) is greater than 4 MPa. The fixing frame (10) is provided with a plurality of air inlets (12), and the plurality of air inlets (12) are arranged at intervals along the extension direction of the ventilation channel (11).

4. The dust suppression device according to claim 1, characterized in that: The fixing frame (10) comprises: A fixing plate (14), wherein the air inlet (12) is provided on the fixing plate (14); A shell (15) is arranged on the fixing plate (14), the shell (15) is located on a side of the fixing plate (14) facing the forward direction of the tunnel boring machine, the ventilation channel (11) is provided between the shell (15) and the fixing plate (14), and the water outlet (13) is provided on a side of the shell (15) away from the fixing plate (14).

5. The dust suppression device according to claim 1, characterized in that: The fixing frame (10) is an arc-shaped structure.

6. The dust suppression device according to claim 5, characterized in that: The ejector tube (20) gradually deviates from the center of the fixing frame (10) in a direction approaching the water outlet (13).

7. The dust suppression device according to claim 6, characterized in that: The included angle between the axis of the ejector tube (20) and the axis of the fixing frame (10) is set between 30° and 40°.

8. The dust suppression device according to claim 2, characterized in that: The water delivery channel (40) extends along the extension direction of the fixing frame (10), and a plurality of water delivery ports are provided on the water delivery channel (40). The plurality of water delivery ports are provided in a one-to-one correspondence with the plurality of dust reduction structures (30), and the dust reduction structures (30) are connected to the water delivery ports.

9. The dust suppression device according to claim 8, characterized in that: The dust reduction structure (30) comprises: A seat body (31) fixedly connected to the water delivery port; The nozzle (32) is detachably arranged on the seat body (31).

10. The dust suppression device according to claim 1, characterized in that: The fixing frame (10) further comprises: A mounting plate, wherein the mounting plate is adapted to the structure of the tunnel boring machine, and a plurality of connecting holes are arranged on the mounting plate, and the mounting plate is detachably connected to the tunnel boring machine through the connecting holes and locking members.

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