Adjusting mechanism applied to combined tunneling machine external spraying device

Abstract

This invention belongs to the technical field of mining machinery and equipment, and particularly relates to an adjustment mechanism for an external spray device of a combined tunneling machine. During operation, the water outlet sprays water mist, and compressed air is delivered from the air inlet into the amplifier cavity. Due to the Coanda effect, the compressed air from the air inlet flows at high speed along the inner annular wall of the amplifier cavity, forming a negative pressure area in the amplifier's through-hole. This generates a high-speed airflow that is ejected at high speed along the water outlet direction, delivering the water mist sprayed by the water outlet to a more distant area requiring dust suppression. Simultaneously, the negative pressure area also causes the dust-laden airflow around the air amplifier to flow towards the dust suppression area, drawing a large amount of dust-laden gas into the cavity to fully contact the mist droplets, achieving secondary dust suppression. This optimizes the atomization effect and improves dust suppression efficiency. Furthermore, the adjustment mechanism adjusts the diameter of the second water outlet cavity, increasing the water outlet's range and facilitating close-range dust suppression. The operation is simple and convenient, allowing for free switching of the water outlet range, resulting in higher dust removal efficiency.

Description

[0001] This application is a divisional application. The original application has the application number CN202110085289.1, the application date is January 22, 2021, and the invention title is "A combined external spraying device for tunneling machines". [Technical Field]

[0002] This invention belongs to the technical field of mining machinery and equipment, and particularly relates to the adjustment mechanism applied to the external spraying device of a combined tunneling machine. [Background Technology]

[0003] Currently, with the continuous improvement of the mechanization level of coal mines and the widespread use of high-power tunneling machines, a large amount of harmful dust is generated during the production process, resulting in a harsh environment at the tunneling face. This not only affects the health of the workers and reduces the service life of the machines, but also easily causes dust explosions when the dust concentration in the air reaches a certain level. Therefore, it is necessary to carry out effective dust suppression treatment at the tunneling face.

[0004] Currently, dust suppression at most tunneling faces in my country relies primarily on the internal and external spray systems of the tunneling machine itself. These systems are the most critical devices for directly reducing dust at the tunneling face. The internal spray system is prone to clogging, potentially paralyzing the entire system; therefore, dust suppression at tunneling faces mainly depends on the external spray system. However, traditional external spray devices suffer from drawbacks such as large droplet size, high water consumption, poor atomization, and short range. Furthermore, traditional external spray devices are not suitable for short-range dust suppression, cannot freely switch water jet ranges, and have low dust removal efficiency. [Summary of the Invention]

[0005] This invention proposes an adjustment mechanism for the external spray device of a combined tunneling machine, aiming to solve the problems of traditional external spray nozzles for tunneling machines, such as high water consumption, large droplet size, poor atomization effect, short range, unfavorable for short-distance dust suppression, inability to freely switch water spray range, and low dust removal efficiency.

[0006] This invention is achieved by the following technical solution:

[0007] An adjustment mechanism for an external spray device of a combined tunneling machine includes a water outlet for spraying water mist and an air amplifier. The air amplifier includes an amplifier body with an amplifier through hole penetrating both ends. The water outlet is placed inside the amplifier through hole. The amplifier body has an amplifier cavity extending circumferentially along the amplifier through hole in its side wall. The air amplifier has an air inlet hole on its side wall that connects the outer surface of the air amplifier side wall with the amplifier cavity.

[0008] The water outlet includes a water supply pipe, the amplifier through hole includes a negative pressure chamber, the negative pressure chamber corresponds to the position of the amplifier cavity, and the water supply pipe is disposed inside the negative pressure chamber;

[0009] The water supply pipeline includes an inlet end and an outlet end. A mist outlet chamber is provided on the side of the negative pressure chamber near the outlet end. The mist outlet chamber is connected to the negative pressure chamber. The diameter of the mist outlet chamber gradually increases along the water supply direction.

[0010] The water outlet also includes an atomizing nozzle disposed on the water outlet end. The water outlet end of the atomizing nozzle is located inside the mist outlet chamber. The atomizing nozzle includes a nozzle body. A water outlet chamber is opened inside the nozzle body. The water outlet chamber includes a first water outlet chamber and a second water outlet chamber that are sequentially opened and connected along the water outlet direction. The aperture of the first water outlet chamber is larger than the aperture of the second water outlet chamber.

[0011] The atomizing nozzle is provided with an adjustment mechanism for adjusting the orifice diameter of the second water outlet chamber. The adjustment mechanism includes two adjustment push plates disposed opposite to each other in the second water outlet chamber, an adjustment ring rotatably disposed on the outer wall of the atomizing nozzle, and a cam structure disposed between the adjustment ring and the atomizing nozzle that can drive the two adjustment push plates to move closer or open synchronously. The cam structure includes a crescent groove disposed on the inner wall of the adjustment ring and corresponding to the position of the adjustment push plate, a cam push rod, and a second return spring disposed between the adjustment push plate and the atomizing nozzle. One end of the cam push rod is fixedly connected to the adjustment push plate, and the other end extends into the crescent groove so that when the adjustment rotates around the atomizing nozzle in a circumferential direction, the cam push rod can slide in contact with the crescent groove.

[0012] As described above, the adjustment mechanism applied to the external spray device of the combined tunneling machine has a dust inlet chamber on the side of the negative pressure chamber near the water inlet end. The dust inlet chamber is connected to the negative pressure chamber, and the diameter of the dust inlet chamber gradually increases along the direction near the water inlet end.

[0013] As described above, the adjustment mechanism applied to the external spray device of the combined tunneling machine has a fixed bracket between the air amplifier and the water outlet, so that the water outlet is fixedly suspended in the amplifier through hole, and the water supply pipe is arranged along the axial direction of the amplifier through hole and located at the center of the amplifier through hole.

[0014] As described above, the adjustment mechanism applied to the external spray device of the combined tunneling machine includes a number of fixed connecting rods that connect the outer wall of the water supply pipe to the inner wall of the amplifier through hole, and the number of fixed connecting rods are evenly arranged along the circumference of the water supply pipe.

[0015] As described above, the adjustment mechanism applied to the external spray device of the combined tunneling machine includes a leak-proof mechanism in the water outlet chamber. The leak-proof mechanism includes a positioning baffle, a blocking column that moves along the water outlet direction, and a reset device that pushes the blocking column toward the positioning baffle. The positioning baffle has a baffle through hole, and the blocking column moves along the direction toward the positioning baffle until it contacts the baffle through hole and blocks the baffle through hole. The reset device includes a fixing plate fixed in the water outlet chamber, a mounting guide sleeve on the fixing plate, and a first reset spring in the mounting guide sleeve that connects the fixing plate and the blocking column. The atomizing nozzle also includes a nozzle, and the bottom of the nozzle has several spray holes.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. In this invention, the atomizing nozzle is provided with an adjustment mechanism for adjusting the orifice diameter of the second water outlet chamber. By adjusting the orifice diameter of the second water outlet chamber through the adjustment mechanism, the orifice diameters of the first and second water outlet chambers are the same, that is, the range is normal when the water pressure is normal, or the orifice diameter of the second water outlet chamber is larger than that of the first water outlet chamber, thereby increasing the range of the water outlet. At the same time, the supply of compressed air to the air amplifier can be stopped, which is more conducive to dust suppression at close range. The operation is simple and convenient, the water outlet range can be freely switched, and the dust removal efficiency is higher.

[0018] 2. This invention provides an adjustment mechanism for an external spray device applied to a combined tunneling machine. During operation, the water outlet sprays water mist, and compressed air is delivered into the amplifier cavity from the air inlet. Due to the Coanda effect, the compressed air delivered from the air inlet flows at high speed along the inner annular wall of the amplifier cavity, forming a negative pressure area in the amplifier through hole. This generates a high-speed airflow that is ejected at high speed along the water outlet direction, delivering the water mist sprayed by the water outlet to a more distant area that needs dust suppression. At the same time, the negative pressure area can also cause the dust-laden airflow around the air amplifier to flow towards the dust suppression area, drawing a large amount of dust-laden gas into the cavity to fully contact the mist droplets, achieving secondary dust suppression, thereby optimizing the atomization effect and improving dust suppression efficiency.

[0019] 3. The atomizing nozzle of the present invention has a scientific and reasonable structure and is safe and convenient to use. It includes a nozzle body connected to a water supply pipe. A water outlet chamber is provided inside the nozzle body. The water outlet chamber includes a first water outlet chamber and a second water outlet chamber opened sequentially along the water outlet direction. At the same time, the aperture of the first water outlet chamber is larger than the aperture of the third water outlet chamber, and the aperture of the second water outlet chamber gradually decreases along the water outlet direction. When water flows into the nozzle body, the flow rate of the water flow is changed by changing the aperture of the water outlet chamber, thereby increasing the water pressure and further increasing the range of the water outlet, so that the sprayed water mist can be delivered to a more distant area that needs dust suppression. [Attached Image Description]

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a perspective view of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the present invention;

[0024] Figure 4 for Figure 3 Sectional view of AA;

[0025] Figure 5 for Figure 3 Sectional view of BB;

[0026] Figure 6 This is a cross-sectional view of the atomizing nozzle in this invention;

[0027] Figure 7 This is a schematic diagram of the connection between the atomizing nozzle and the adjusting ring in a specific embodiment of the present invention.

Detailed Implementation Methods

[0028] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] When ordinal numbers such as "first" and "second" are mentioned in the embodiments of the present invention, unless they actually express the meaning of order according to the context, they should be understood as being used only for differentiation.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Specific Implementation Example 1, such as Figure 1-6The adjustment mechanism shown is applied to the external spray device of the combined tunneling machine, including a water outlet 1 that sprays water mist and an air amplifier 2. The air amplifier 2 includes an amplifier body 21, and an amplifier through hole 22 extending through both ends of the amplifier body 21. The water outlet 1 is placed in the amplifier through hole 22. An amplifier cavity 23 extending circumferentially along the amplifier through hole 22 is provided in the side wall of the amplifier body 21. An air inlet 24 connecting the outer surface of the side wall of the air amplifier 2 and the amplifier cavity 23 is provided on the side wall of the air amplifier 2. This invention provides an adjustment mechanism for an external spray device of a combined tunneling machine. During operation, the water outlet 1 sprays water mist, and compressed air is delivered from the air inlet 24 into the amplifier cavity 23. Due to the Coanda effect, the compressed air delivered from the air inlet 24 flows at high speed along the inner annular wall of the amplifier cavity 23, forming a negative pressure area in the amplifier through hole 22. This generates a high-speed airflow that is ejected at high speed along the water outlet direction, delivering the water mist sprayed by the water outlet 1 to a more distant area that needs dust suppression. At the same time, the negative pressure area can also cause the dust-laden airflow around the air amplifier to flow towards the dust suppression area, drawing a large amount of dust-laden gas into the cavity to fully contact the mist droplets, achieving secondary dust suppression, thereby optimizing the atomization effect and improving dust suppression efficiency.

[0032] Specifically, the water outlet 1 includes a water supply pipe 11, and the amplifier through-hole 22 includes a negative pressure chamber 221. The negative pressure chamber 221 corresponds to the position of the amplifier cavity 23, and the water supply pipe 11 is disposed within the negative pressure chamber 221. Compressed gas is introduced into the amplifier cavity 23 to generate the Coanda effect, creating a negative pressure area within the negative pressure chamber 221. This guides the dust-laden airflow towards the mist outlet 222, thereby improving the dust reduction rate and improving the working environment.

[0033] In addition, the water supply pipe 11 includes an inlet end 111 and an outlet end 112. A mist outlet chamber 222 is provided on the side of the negative pressure chamber 221 near the outlet end 112. The mist outlet chamber 222 communicates with the negative pressure chamber 221, and the aperture of the mist outlet chamber 222 gradually increases along the water supply direction. The spray is emitted from the mist outlet chamber 222, and the gradually increasing aperture along the water supply direction allows for more thorough contact between the dust-removing water mist and the dust-laden airflow, thus improving dust removal efficiency.

[0034] Furthermore, a dust inlet chamber 223 is provided on the side of the negative pressure chamber 221 near the water inlet end 111. The dust inlet chamber 223 communicates with the negative pressure chamber 221, and the diameter of the dust inlet chamber 223 gradually increases along the direction near the water inlet end 111. This facilitates the flow of dust-laden airflow around the air amplifier towards the dust settling area.

[0035] More specifically, a fixed bracket 3 is provided between the air amplifier 2 and the water outlet 1, so that the water outlet 1 is fixedly suspended in the amplifier through hole 22. The water outlet 1 is suspended in the amplifier through hole 22, so that the water mist sprayed by the water outlet 1 can come into contact with more dust-laden airflow around it, thereby improving the dust reduction efficiency.

[0036] Furthermore, the water supply pipe 11 is arranged along the axial direction of the amplifier through hole 22 and is located at the center of the amplifier through hole 22. This allows the water mist sprayed from the center of the amplifier through hole 22 by the water outlet 1 to be ejected at high speed along the water outlet direction with the high-speed airflow.

[0037] Furthermore, the fixed bracket 3 includes several fixed connecting rods 31 that connect the outer wall of the water supply pipe 11 to the inner wall of the amplifier through hole 22. These fixed connecting rods 31 are evenly arranged circumferentially along the water supply pipe 11. This ensures the water outlet 1 can be securely installed while minimizing the blockage of the amplifier through hole 22 by the fixed connecting rods 31.

[0038] Specifically, the water outlet 1 further includes an atomizing nozzle 12 disposed on the water outlet end 112, the water outlet end of the atomizing nozzle 12 being located within the mist outlet chamber 222. This reduces the droplet size of the spray, saves water consumption, ensures sufficient contact with dust-laden gas, and improves dust suppression efficiency.

[0039] In addition, both the inlet end 111 and the outlet end 112 of the water supply pipe 11 are provided with external threads. The atomizing nozzle 12 is provided with an internal nozzle thread that matches the external thread of the outlet end 112. The atomizing nozzle 12 is detachable, which facilitates replacement when the atomizing nozzle 12 is blocked or damaged in special circumstances. By providing an external thread at the inlet end 111, it is connected to the base of the tunneling machine, which facilitates the replacement and maintenance of the entire device.

[0040] Specifically, the water dispenser 1 further includes an atomizing nozzle 12 disposed on the water outlet end 112. The water outlet end of the atomizing nozzle 12 is located within the mist outlet chamber 222. The atomizing nozzle 12 includes a nozzle body 121, and the nozzle body 121 has a water outlet chamber 122 inside. The water outlet chamber 122 includes a first water outlet chamber 1221 and a second water outlet chamber 1222 that are sequentially opened and connected along the water outlet direction. The aperture of the first water outlet chamber 1221 is larger than that of the second water outlet chamber 1222. The structure is scientific and reasonable, and it is safe and convenient to use. At the same time, the aperture of the first water outlet chamber 1221 is larger than that of the second water outlet chamber 1222, so that when water flows into the nozzle body 121, the flow rate of the water is changed by changing the aperture of the water outlet chamber 122, thereby increasing the water pressure and further increasing the range of the water dispenser 1, so that the sprayed water mist can be delivered to a more distant area that needs dust suppression.

[0041] More specifically, the water outlet chamber 122 is provided with a leak-proof mechanism 123. The leak-proof mechanism 123 includes a positioning baffle 1231, a blocking column 1232 that moves along the water outlet direction, and a reset device 1233 that pushes the blocking column 1232 toward the positioning baffle 1231. The positioning baffle 1231 is provided with a baffle through hole 1231a. The blocking column 1232 moves along the direction toward the positioning baffle 1231 until it contacts the baffle through hole 1231a and blocks the baffle through hole 1231a. The reset device 1233 includes a fixing plate 1233a fixed in the water outlet chamber 122, a mounting guide sleeve 1233b provided on the fixing plate 1233a, and a first reset spring provided in the mounting guide sleeve 1233b to connect the fixing plate 1233a and the blocking column 1232. 1233c, The fixing plate 1233a is provided with a through hole. The working principle of the anti-leakage mechanism 123 is as follows: The blocking column 1232 extends into the mounting guide sleeve 1233b and is connected to the first return spring 1233c. When there is water flow, due to the impact force of the water flow, the blocking column 1232 is pushed to compress the first return spring 1233c. The water flows out through the through hole 1231a of the baffle and the through hole on the fixing plate 1233a. When no water is introduced, the blocking column 1232 blocks the through hole 1231a of the baffle through the elasticity of the first return spring 1233c to prevent water leakage. Specifically, a rubber plug is provided at one end of the blocking column 1232 near the positioning baffle 1231. The rubber plug blocks the through hole 1231a of the baffle through the elasticity of the first return spring 1233c, and the rubber plug has a certain deformation, which makes the blocking effect better.

[0042] Furthermore, the atomizing nozzle 12 also includes a nozzle 124, the bottom of which is provided with a plurality of spray holes 1241, thereby further refining the water flow and making the spraying effect better.

[0043] Specific embodiment two, such as Figure 1-7 As shown, the atomizing nozzle 12 is equipped with an adjustment mechanism 125 for adjusting the orifice diameter of the second water outlet chamber 1222. By adjusting the orifice diameter of the second water outlet chamber 1222 through the adjustment mechanism 125, the orifice diameters of the first water outlet chamber 1221 and the second water outlet chamber 1222 can be the same, i.e., the range is normal when the water pressure is normal. Alternatively, the orifice diameter of the second water outlet chamber 1222 can be made larger than the orifice diameter of the first water outlet chamber 1221, thereby increasing the water outlet range. At the same time, the supply of compressed air to the air amplifier can be stopped, which is more conducive to dust suppression at close range. The operation is simple and convenient, the water outlet range can be freely switched, and the dust removal efficiency is higher.

[0044] Specifically, the adjustment mechanism 125 includes two adjusting push plates 1251 disposed opposite to each other in the second water outlet chamber 1222, an adjusting ring 1252 rotatably disposed on the outer wall of the atomizing nozzle 12, and a cam structure 1253 disposed between the adjusting ring 1252 and the atomizing nozzle 12, capable of driving the two adjusting push plates 1251 to move closer or open synchronously. The cam structure 1253 includes a cam structure disposed on the inner wall of the adjusting ring 1252 and the adjusting push plates 1251. The device includes a crescent groove 1253a, a cam push rod 1253b, and a second return spring 1253c located between the adjusting push plate 1251 and the atomizing nozzle 12. One end of the cam push rod 1253b is fixedly connected to the adjusting push plate 1251, and the other end extends into the crescent groove 1253a, so that when the adjusting ring 1252 rotates around the atomizing nozzle 12, the cam push rod 1253b can slide in contact with the crescent groove 1253a. Both cam push rods 1253b are provided with corresponding crescent grooves 1253a. When it is necessary to change the range of the water outlet 1, the adjusting ring 1252 is rotated, causing the cam push rods 1253b to slide in the crescent grooves 1253a of different depths. When the adjusting ring 1252 is rotated, the cam push rods 1253b gradually slide from the deep part of the crescent groove 1253a to the tip of the crescent groove 1253a. The inner wall of the crescent groove 1253a pushes the cam push rods 1253b, causing the two adjusting push plates 1251 to move closer together, making the diameter of the second water outlet chamber 1222 smaller than that of the first water outlet chamber 1221. When the second return spring 1253c is in a stretched state, the second return spring 1253c is in a stretched state. When the adjusting ring 1252 rotates in the opposite direction, the cam push rod 1253b slides from the tip of the crescent groove 1253a to the deep groove. At this time, the second return spring 1253c pulls the adjusting push plate 1251 to reset. As the cam push rod 1253b slides into the crescent groove 1253a, the two adjusting push plates 1251 move away synchronously, changing the aperture of the second water outlet chamber 1222. The operation is convenient, and the range of the water outlet 1 can be changed by arbitrarily switching the aperture of the second water outlet chamber 1222.

[0045] This invention relates to an adjustment mechanism for an external spray device on a combined tunneling machine. During operation, the water outlet sprays water mist, and compressed air is delivered from the air inlet into the amplifier cavity. Due to the Coanda effect, the compressed air from the air inlet flows at high speed along the inner annular wall of the amplifier cavity, forming a negative pressure area in the amplifier's through-hole. This generates a high-speed airflow that is ejected at high speed along the water outlet direction, delivering the water mist sprayed by the water outlet to a more distant area requiring dust suppression. Simultaneously, the negative pressure area also causes the dust-laden airflow around the air amplifier to flow towards the dust suppression area, drawing a large amount of dust-laden gas into the cavity to fully contact the mist droplets, achieving secondary dust suppression. This optimizes the atomization effect and improves dust suppression efficiency. The atomizing nozzle in this invention has a scientifically sound structure and is safe and convenient to use. It includes a nozzle body connected to a water supply pipe, with a water outlet cavity inside the nozzle body. The water outlet cavity includes sections sequentially opened along the water outlet direction. The first water outlet chamber has a larger aperture than the third water outlet chamber, causing the aperture of the second water outlet chamber to gradually decrease along the water outlet direction. This alters the water flow velocity as water flows into the nozzle body, increasing water pressure and further extending the spray range. This allows the sprayed water mist to reach more distant areas requiring dust suppression. The atomizing nozzle also features an adjustment mechanism for regulating the aperture of the second water outlet chamber. This mechanism adjusts the aperture of the second water outlet chamber so that the apertures of the first and second water outlet chambers are the same (normal water pressure results in normal spray range), or the aperture of the second water outlet chamber is larger than that of the first, increasing the spray range. Simultaneously, it can stop supplying compressed air to the air amplifier, facilitating closer-range dust suppression. The operation is simple and convenient, allowing for free switching of the water spray range and higher dust removal efficiency.

[0046] The above description is one embodiment provided in conjunction with specific content, and it is not intended that the specific implementation of the present invention be limited to these descriptions. Furthermore, due to different industry nomenclature, the structures of the present invention, such as the partition plate, reactor, waterproof mounting base, and waterproof shell, are not limited to the above names or English names. Any methods or structures similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. An adjustment mechanism for an external spraying device of a combined tunneling machine, characterized in that, The device includes a water sprayer (1) that sprays water mist and an air amplifier (2). The air amplifier (2) includes an amplifier body (21). The amplifier body (21) has an amplifier through hole (22) that runs through both ends of it. The water sprayer (1) is placed inside the amplifier through hole (22). The amplifier body (21) has an amplifier cavity (23) that extends circumferentially along the amplifier through hole (22) inside its side wall. The air amplifier (2) has an air inlet (24) that connects the outer surface of the side wall of the air amplifier (2) with the amplifier cavity (23). The water outlet (1) includes a water supply pipe (11), the amplifier through hole (22) includes a negative pressure chamber (221), the negative pressure chamber (221) corresponds to the position of the amplifier cavity (23), and the water supply pipe (11) is located in the negative pressure chamber (221); The water supply pipe (11) includes an inlet end (111) and an outlet end (112). The negative pressure chamber (221) is provided with a mist outlet chamber (222) on the side near the outlet end (112). The mist outlet chamber (222) is connected to the negative pressure chamber (221). The aperture of the mist outlet chamber (222) gradually increases along the water supply direction. The water outlet (1) also includes an atomizing nozzle (12) disposed on the water outlet end (112). The water outlet end of the atomizing nozzle (12) is located in the mist outlet chamber (222). The atomizing nozzle (12) includes a nozzle body (121). The nozzle body (121) has a water outlet chamber (122) inside. The water outlet chamber (122) includes a first water outlet chamber (1221) and a second water outlet chamber (1222) that are sequentially opened and connected along the water outlet direction. The aperture of the first water outlet chamber (1221) is larger than the aperture of the second water outlet chamber (1222). The atomizing nozzle (12) is provided with an adjustment mechanism (125) for adjusting the aperture of the second water outlet chamber (1222). The adjustment mechanism (125) includes two adjustment push plates (1251) disposed opposite to each other in the second water outlet chamber (1222), an adjustment ring (1252) rotatably disposed on the outer side wall of the atomizing nozzle (12), and a cam structure (1253) disposed between the adjustment ring (1252) and the atomizing nozzle (12) that can drive the two adjustment push plates (1251) to move closer or open synchronously. The cam structure (1253) includes a cam on the adjustment ring (1251) 52) A crescent groove (1253a) on the inner sidewall corresponding to the position of the adjusting push plate (1251), a cam push rod (1253b), and a second return spring (1253c) disposed between the adjusting push plate (1251) and the atomizing nozzle (12). One end of the cam push rod (1253b) is fixedly connected to the adjusting push plate (1251), and the other end extends into the crescent groove (1253a) so that when the adjusting ring (1252) rotates around the atomizing nozzle (12), the cam push rod (1253b) can slide in contact with the crescent groove (1253a).

2. The adjusting mechanism for the external spraying device of a combined tunneling machine according to claim 1, characterized in that, The negative pressure chamber (221) has a dust inlet chamber (223) on the side near the water inlet end (111). The dust inlet chamber (223) is connected to the negative pressure chamber (221), and the diameter of the dust inlet chamber (223) gradually increases along the direction near the water inlet end (111).

3. The adjusting mechanism for the external spraying device of a combined tunneling machine according to claim 2, characterized in that, A fixed bracket (3) is provided between the air amplifier (2) and the water outlet (1), so that the water outlet (1) is fixedly suspended in the amplifier through hole (22). The water supply pipe (11) is arranged along the axial direction of the amplifier through hole (22) and is located at the center of the amplifier through hole (22).

4. The adjusting mechanism for the external spraying device of a combined tunneling machine according to claim 3, characterized in that, The fixed bracket (3) includes several fixed connecting rods (31) that connect the outer wall of the water supply pipe (11) to the inner wall of the amplifier through hole (22), and the several fixed connecting rods (31) are evenly arranged around the water supply pipe (11).

5. The adjusting mechanism for the external spraying device of a combined tunneling machine according to claim 1, characterized in that, The water outlet chamber (122) is equipped with a leak-proof mechanism (123). The leak-proof mechanism (123) includes a positioning baffle (1231), a blocking column (1232) that moves along the water outlet direction, and a reset device (1233) that pushes the blocking column (1232) toward the positioning baffle (1231). The positioning baffle (1231) is provided with a baffle through hole (1231a). The blocking column (1232) moves along the direction toward the positioning baffle (1231) until it contacts the baffle through hole (1231a). The baffle has a through hole (1231a); the reset device (1233) includes a fixed plate (1233a) fixed in the water outlet chamber (122), a mounting guide sleeve (1233b) on the fixed plate (1233a), and a first reset spring (1233c) in the mounting guide sleeve (1233b) connecting the fixed plate (1233a) and the blocking column (1232); the atomizing nozzle (12) also includes a nozzle (124), and the bottom of the nozzle (124) is provided with a plurality of spray holes (1241).

Images