CN116586217A

CN116586217A - Spray nozzle for spraying concrete

Info

Publication number: CN116586217A
Application number: CN202310530929.4A
Authority: CN
Inventors: 江尧; 杨会军; 吴跃; 王儒洋; 赵元琪; 侯志成; 何鹏
Original assignee: National Energy Group Ningxia Coal Industry Co Ltd
Current assignee: National Energy Group Ningxia Coal Industry Co Ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-08-15

Abstract

The application provides a spray concrete nozzle, comprising: the first mixer comprises a main connecting pipe and a throat pipe, wherein the main connecting pipe is provided with a first mixing cavity, a fluid inlet and a first mixing outlet which are all communicated with the first mixing cavity, a part of the throat pipe is positioned in the first mixing cavity, the throat pipe is provided with a compressed air inlet, and the compressed air inlet is communicated with the first mixing cavity; the second mixer is detachably connected with the first mixer and is provided with a second mixing cavity, a second mixing outlet and a concrete inlet which are all communicated with the second mixing cavity, and the first mixing outlet is communicated with the second mixing cavity; the nozzle is detachably connected with one end of the second mixer and is provided with an injection channel which is communicated with the second mixing outlet; the number of the throats is multiple, the sizes of the throats are different, and any one of the throats can be selectively and detachably connected with the main connecting pipe. The technical scheme solves the problem that the material mixing of the concrete spraying nozzle in the prior art is insufficient during dry spraying and wet spraying.

Description

Spray nozzle for spraying concrete

Technical Field

The application relates to the technical field of concrete construction, in particular to a spray concrete nozzle.

Background

The sprayed concrete is a concrete product which is formed by mixing cement, coarse aggregate, fine aggregate, water, a water reducing agent, an accelerator and other raw materials according to a certain proportion, spraying compressed air to the surface of a working surface through a pipeline by using a special concrete spraying machine as power, and condensing and hardening. The sprayed concrete has the advantages of low cost, convenient operation and the like, and is the common concrete in the tunnel and mine support industry.

The construction process of spraying concrete can be divided into dry spraying and wet spraying, wherein the dry spraying is to mix various materials, then convey the materials to a feeding system, take compressed air as power, convey the materials to a nozzle, set up a porous water ring inside the nozzle, mix water and additive with raw materials at the nozzle under the action of pressure, and then spray the materials to a working surface; wet spraying is to mix sand, cement, water and other materials, convey the mixture to nozzle via conveying system, mix accelerator with concrete in the nozzle and spray the mixture to the work surface under the action of compressed air. Compared with a dry injection method, the wet injection method has low rebound rate, effectively reduces dust generation in the injection process, and is a currently mainstream construction method.

In the existing concrete dry spraying process, dry materials are conveyed to a nozzle through conveying equipment, water and an accelerator are added to the nozzle, so that the water and the accelerator are mixed with the concrete dry materials in the nozzle, and then the concrete dry materials are sprayed to a working surface. According to the method, water and dry materials are mixed, and due to the fact that the water and cement are short in action time, gelation reaction does not fully occur, a large amount of dust is generated in the operation process, the environment is polluted, and health of constructors is endangered.

In the existing concrete wet spraying process, in order to reduce the influence of viscosity on concrete conveying, an on-site mixing mode is adopted, the concrete conveying distance is limited, the speed is low when the concrete is conveyed to a nozzle, the pressure is low, and the working efficiency is reduced. In the prior main flow technology, the accelerator is directly added into the nozzle through a pipeline, so that the accelerator is sprayed to the working surface for construction after being mixed with concrete in the nozzle for a short time, the accelerator and the concrete are insufficiently mixed, the phenomenon of asynchronous concrete setting time occurs on the working surface, and the construction quality is greatly reduced. The nozzles developed by partial technology only change the adding mode of the accelerator into a multi-strand adding mode, and still fail to well improve the problem of fully mixing the accelerator and the concrete.

Disclosure of Invention

The application provides a concrete spraying nozzle, which aims to solve the problem that the concrete spraying nozzle in the prior art is insufficient in material mixing during dry spraying and wet spraying.

In order to solve the above problems, the present application provides a spray concrete nozzle comprising: the first mixer comprises a main connecting pipe and a throat pipe, the main connecting pipe is provided with a first mixing cavity, a fluid inlet and a first mixing outlet, the fluid inlet and the first mixing outlet are all communicated with the first mixing cavity, a part of the throat pipe is positioned in the first mixing cavity, the throat pipe is provided with a compressed air inlet, the compressed air inlet is communicated with the first mixing cavity, and the first mixing cavity is used for mixing compressed air entering from the compressed air inlet and fluid entering from the fluid inlet; the second mixer is detachably connected with the first mixer, and is provided with a second mixing cavity, a second mixing outlet and a concrete inlet, wherein the second mixing outlet and the concrete inlet are communicated with the second mixing cavity; the nozzle is detachably connected with one end of the second mixer, and is provided with an injection channel which is communicated with the second mixing outlet and used for ejecting the mixture in the second mixing cavity; the plurality of throats are different in outlet size, and any one of the throats can be selectively and detachably connected with the main connecting pipe.

Further, the venturi includes first go-between and a conical section of thick bamboo, and the one end that conical section of thick bamboo radial dimension is big is connected with first go-between, and the one end that conical section of thick bamboo radial dimension is little inserts in the main takeover, and first go-between has compressed air inlet, and conical section of thick bamboo has the intercommunication chamber, and compressed air inlet communicates through intercommunication chamber and first mixing chamber, and the connection can be dismantled to one end of first go-between and main takeover.

Further, the main connecting pipe comprises a first connecting pipe, a second connecting pipe and a third connecting pipe, the first connecting pipe is communicated with the second connecting pipe in the axial direction of the first connecting pipe, the third connecting pipe is communicated with the first connecting pipe in the radial direction of the first connecting pipe, the first connecting pipe is provided with a first cavity, the second connecting pipe is provided with a second cavity and a first mixing outlet, the third connecting pipe is provided with a third cavity and a fluid inlet, a part of the throat pipe is positioned in the first cavity, the second cavity are communicated with the third cavity, the first cavity and the second cavity form a first mixing cavity, the throat pipe and the first connecting pipe are detachably connected, and the second connecting pipe and the second mixer are detachably connected.

Further, the first connecting pipe comprises a first sub connecting pipe and a second sub connecting pipe which are connected with each other, the radial size of the first sub connecting pipe is larger than that of the second sub connecting pipe, the throat pipe is detachably connected with the first sub connecting pipe, the second sub connecting pipe is connected with the second connecting pipe, and the third connecting pipe is connected with the first sub connecting pipe.

Further, the second connecting pipe is of a conical structure, one end of the second connecting pipe with small radial size is connected with the second sub connecting pipe, and one end of the second connecting pipe with large radial size is detachably connected with the second mixer.

Further, the second mixer comprises an inner connecting pipe, an outer connecting pipe, a second connecting ring and a third connecting ring, the outer connecting pipe is sleeved on the inner connecting pipe, two ends of the inner connecting pipe are respectively connected with the second connecting ring and the third connecting ring, two ends of the outer connecting pipe are respectively connected with the second connecting ring and the third connecting ring, a second mixing cavity is formed among the outer wall of the inner connecting pipe, the inner wall of the outer connecting pipe, the second connecting ring and the third connecting ring, a communication hole group communicated with the second mixing cavity is formed in the side wall of the inner connecting pipe, the communication hole group is communicated with the cavity in the inner connecting pipe, the second connecting ring is provided with a concrete inlet, the second connecting ring is provided with a second mixing outlet, and the third connecting ring is detachably connected with the nozzle.

Further, the communication hole group comprises a first sub-hole and a second sub-hole which are arranged side by side along the axial direction of the inner connecting pipe, the first sub-hole and the second sub-hole are multiple, and the multiple first sub-holes and the multiple second sub-holes are arranged at intervals along the circumferential direction of the inner connecting pipe.

Further, the included angle between the axis of the first sub-hole or the axis of the second sub-hole and the axis of the inner connecting pipe is A, and A is more than or equal to 15 degrees and less than or equal to 30 degrees.

Further, the inner connecting pipe comprises a fourth connecting pipe, a transition connecting pipe and a fifth connecting pipe which are sequentially connected, the fourth connecting pipe is connected with the second connecting ring, the fifth connecting pipe is of a conical structure, one end of the fifth connecting pipe with a large radial size is connected with the third connecting ring, the maximum radial size of the fifth connecting pipe is the same as the radial size of the fourth connecting pipe, and the communication hole group is arranged on the side wall of the fifth connecting pipe.

Further, the second mixer further comprises a communicating connecting pipe, the communicating connecting pipe is communicated with the external connecting pipe, and the communicating connecting pipe is detachably connected with the main connecting pipe; the shotcrete nozzle comprises a concrete conveying pipe, the concrete conveying pipe is detachably connected with the second connecting ring, and the concrete conveying pipe is used for conveying concrete to the second mixing cavity.

By applying the technical scheme of the application, the application provides a concrete spraying nozzle, which comprises the following components: the first mixer comprises a main connecting pipe and a throat pipe, the main connecting pipe is provided with a first mixing cavity, a fluid inlet and a first mixing outlet, the fluid inlet and the first mixing outlet are all communicated with the first mixing cavity, a part of the throat pipe is positioned in the first mixing cavity, the throat pipe is provided with a compressed air inlet, the compressed air inlet is communicated with the first mixing cavity, and the first mixing cavity is used for mixing compressed air entering from the compressed air inlet and fluid entering from the fluid inlet; the second mixer is detachably connected with the first mixer, and is provided with a second mixing cavity, a second mixing outlet and a concrete inlet, wherein the second mixing outlet and the concrete inlet are communicated with the second mixing cavity; the nozzle is detachably connected with one end of the second mixer, and is provided with an injection channel which is communicated with the second mixing outlet and used for ejecting the mixture in the second mixing cavity; the plurality of throats are different in outlet size, and any one of the throats can be selectively and detachably connected with the main connecting pipe. By adopting the scheme, the compressed air enters the first mixing cavity through the throat pipe, and a negative pressure area is formed when the compressed air flows through the tail end outlet of the throat pipe, so that water or an accelerator or a mixed solution of the two entering from the fluid inlet is sucked into the first mixing cavity. The description is as follows: the compressed air flows through the outlet at the tail end of the throat pipe to form a vortex area, the accelerator and the like are rapidly atomized into small liquid drops under the action of air flow and the impact of the inner wall of the main connecting pipe to form a gas-liquid mixture, then the gas-liquid mixture enters the second mixing cavity, the high-speed gas-liquid mixture enters the second mixing outlet, the high-speed gas-liquid mixture pushes concrete entering from the concrete inlet to rotate in the spraying channel, and the gas-liquid mixture is sprayed out of the spraying channel after being fully mixed with the concrete. By utilizing the spray concrete nozzle of the scheme, the problem that the spray concrete nozzle in the prior art is insufficient in material mixing during dry and wet spraying is effectively solved. Any one of the throats can be selectively and detachably connected with the main connecting pipe, so that the throats can be replaced according to construction conditions, and the universality of the concrete spraying nozzle is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a cross-sectional view of a shotcrete nozzle provided by an embodiment of the present application;

FIG. 2 shows a cross-sectional view of the first mixer of FIG. 1;

fig. 3 shows a cross-sectional view of the second mixer of fig. 1.

Wherein the above figures include the following reference numerals:

10. a first mixer; 11. a main connecting pipe; 111. a first mixing chamber; 112. a fluid inlet; 113. a first mixing outlet; 114. a first connection pipe; 1141. a first sub-pipe; 1142. a second sub-pipe; 115. a second connection pipe; 116. a third connection pipe; 12. a throat; 121. a compressed air inlet; 122. a first connection ring; 123. a conical cylinder; 1231. a communication chamber;

20. a second mixer; 21. a second mixing chamber; 22. a second mixing outlet; 23. a concrete inlet; 24. an inner connecting pipe; 241. a communicating hole group; 2411. a first sub-aperture; 2412. a second sub-aperture; 242. a fourth connection pipe; 243. a transition connecting pipe; 244. a fifth connecting pipe; 25. an outer connecting pipe; 26. a second connecting ring; 27. a third connecting ring; 28. a connecting pipe;

30. a nozzle; 31. a jet channel;

40. and (3) a concrete conveying pipe.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1 to 3, an embodiment of the present application provides a shotcrete nozzle 30, including: the first mixer 10, the first mixer 10 includes a main connection pipe 11 and a throat pipe 12, the main connection pipe 11 has a first mixing cavity 111 and a fluid inlet 112 and a first mixing outlet 113 both communicating with the first mixing cavity 111, a part of the throat pipe 12 is positioned in the first mixing cavity 111, the throat pipe 12 has a compressed air inlet 121, the compressed air inlet 121 communicates with the first mixing cavity 111, and the first mixing cavity 111 is used for mixing the compressed air entering from the compressed air inlet 121 and the fluid entering from the fluid inlet 112; the second mixer 20, the second mixer 20 and the first mixer 10 are detachably connected, the second mixer 20 is provided with a second mixing cavity 21, a second mixing outlet 22 and a concrete inlet 23 which are communicated with the second mixing cavity 21, the first mixing outlet 113 is communicated with the second mixing cavity 21, and the second mixing cavity 21 is used for mixing mixed fluid entering from the first mixing cavity 111 and concrete entering from the concrete inlet 23; a nozzle 30, the nozzle 30 being detachably connected to one end of the second mixer 20, the nozzle 30 having a spray passage 31, the spray passage 31 being in communication with the second mixing outlet 22, the spray passage 31 being for spraying out the mixture in the second mixing chamber 21; wherein, the number of the throats 12 is plural, the outlet sizes of the throats 12 are different, any one of the throats 12 is selectively detachably connected with the main connecting pipe 11.

With this arrangement, compressed air enters the first mixing chamber 111 through the throat 12, and as the compressed air flows through the outlet at the distal end of the throat 12, a negative pressure region is formed, so that water or an accelerator or a mixture of both entering from the fluid inlet 112 is sucked into the first mixing chamber 111. The description is as follows: the compressed air forms a vortex area when flowing through the outlet at the tail end of the throat pipe 12, the accelerator and the like are rapidly atomized into small liquid drops under the action of air flow and the impact of the inner wall of the main connecting pipe 11 to form a gas-liquid mixture, then the gas-liquid mixture enters the second mixing cavity 21, the high-speed gas-liquid mixture enters the second mixing outlet 22, the high-speed gas-liquid mixture pushes concrete entering from the concrete inlet 23 to rotate in the spraying channel 31, and the gas-liquid mixture is sprayed out of the spraying channel 31 after being fully mixed with the concrete. By utilizing the spray concrete nozzle of the scheme, the problem that the spray concrete nozzle in the prior art is insufficient in material mixing is effectively solved. Any one of the plurality of throats 12 is selectively detachably connected with the main connecting pipe 11, so that the throat can be replaced according to construction conditions, and the universality of the concrete spraying nozzle is improved.

Alternatively, the axial length of the nozzle is not less than 10 times the diameter of the nozzle, which is arranged to ensure that the gas-liquid mixture and the concrete are sufficiently mixed in the injection passage 31.

Wherein the throat 12 comprises a first connection ring 122 and a tapered cylinder 123, wherein one end of the tapered cylinder 123 with a large radial dimension is connected with the first connection ring 122, one end of the tapered cylinder 123 with a small radial dimension is inserted into the main connection pipe 11, the first connection ring 122 is provided with a compressed air inlet 121, the tapered cylinder 123 is provided with a communication cavity 1231, the compressed air inlet 121 is communicated with the first mixing cavity 111 through the communication cavity 1231, and the first connection ring 122 is detachably connected with one end of the main connection pipe 11.

The first connecting ring 122 is arranged and can be detachably connected with one end of the main connecting pipe 11, so that the throats 12 with different sizes can be conveniently replaced according to construction conditions; wherein the first connection ring 122 and one end of the main adapter 11 may be connected by means of bolts.

As shown in fig. 1 and 2, in the present embodiment, the main junction 11 includes a first junction 114, a second junction 115, and a third junction 116, the first junction 114 and the second junction 115 communicate in an axial direction of the first junction 114, the third junction 116 and the first junction 114 communicate in a radial direction of the first junction 114, the first junction 114 has a first cavity, the second junction 115 has a second cavity and a first mixing outlet 113, the third junction 116 has a third cavity and a fluid inlet 112, a portion of the throat 12 is located in the first cavity, the second cavity communicate with the third cavity, the first cavity and the second cavity form a first mixing cavity 111, the throat 12 and the first junction 114 are detachably connected, and the second junction 115 and the second mixer 20 are detachably connected.

The third connection pipe 116 and the first connection pipe 114 are connected in the radial direction of the first connection pipe 114, wherein the connection port of the third connection pipe 116 and the first connection pipe 114 is provided at the vortex area formed at the end of the throat pipe 12, so that the water or the mixed liquid of the water and the accelerator entering from the fluid inlet 112 can be more easily pressed into the first mixing chamber 111. Specifically, the throat 12 and the first nipple 114 may be connected by means of bolts; the second nipple 115 and the second mixer 20 may be connected by means of bolts.

The first connection pipe 114 includes a first sub-connection pipe 1141 and a second sub-connection pipe 1142 that are connected to each other, a radial dimension of the first sub-connection pipe 1141 is greater than a radial dimension of the second sub-connection pipe 1142, the throat pipe 12 is detachably connected to the first sub-connection pipe 1141, the second sub-connection pipe 1142 is connected to the second connection pipe 115, and the third connection pipe 116 is connected to the first sub-connection pipe 1141.

In the present embodiment, the second connection pipe 115 has a tapered structure, and one end of the second connection pipe 115 having a small radial dimension is connected to the second sub-connection pipe 1142, and one end of the second connection pipe 115 having a large radial dimension is detachably connected to the second mixer 20.

The second nozzle 115 is provided in a tapered structure, and the flow rate of the gas-liquid mixture in the second chamber is reduced by the change of the diameter size of the second nozzle 115, so that the liquid droplets are further atomized, thereby enabling the water or the mixed liquid of the water and the accelerator entering from the fluid inlet 112 to be more fully mixed with the compressed air.

As shown in fig. 1 and 3, the second mixer 20 includes an inner connection pipe 24, an outer connection pipe 25, a second connection ring 26 and a third connection ring 27, the outer connection pipe 25 is sleeved on the inner connection pipe 24, two ends of the inner connection pipe 24 are respectively connected with the second connection ring 26 and the third connection ring 27, two ends of the outer connection pipe 25 are respectively connected with the second connection ring 26 and the third connection ring 27, a second mixing cavity 21 is formed between the outer wall of the inner connection pipe 24, the inner wall of the outer connection pipe 25, the second connection ring 26 and the third connection ring 27, a communication hole group 241 communicated with the second mixing cavity 21 is formed on the side wall of the inner connection pipe 24, the communication hole group 241 is communicated with a cavity in the inner connection pipe 24, the second connection ring 26 is provided with a concrete inlet 23, the second connection ring 26 is provided with a second mixing outlet 22, and the third connection ring 27 is detachably connected with a nozzle 30.

With the above arrangement, the second mixing chamber 21 is formed between the outer wall of the inner tube 24, the inner wall of the outer tube 25, the second connecting ring 26 and the third connecting ring 27, and the gas-liquid mixture entering the second mixing chamber 21 enters the chamber of the inner tube 24 through the communicating hole group 241, so that it can be mixed with the concrete entering from the concrete inlet 23.

The communication hole group 241 includes a first sub-hole 2411 and a second sub-hole 2412 arranged side by side along an axial direction of the inner tube 24, the first sub-hole 2411 and the second sub-hole 2412 are plural, and the first sub-hole 2411 and the second sub-hole 2412 are arranged at intervals along a circumferential direction of the inner tube 24.

The first and second sub-holes 2411 and 2412 are each provided in plural, so that the rate at which the gas-liquid mixture in the second mixing chamber 21 can enter the chamber of the inner joint pipe 24 can be ensured, thereby enabling the gas-liquid mixture and concrete to be sufficiently mixed.

Further, the angle between the axis of the first sub-hole 2411 or the axis of the second sub-hole 2412 and the axis of the inner tube 24 is A, 15A 30. The included angle a between the axis of the first sub-hole 2411 or the axis of the second sub-hole 2412 and the axis of the inner joint pipe 24 is limited within the above-mentioned angle range, so that it is possible to ensure that the gas-liquid mixture and the concrete can be sufficiently mixed, and also to convey the mixed material into the injection passage.

Specifically, the inner connecting pipe 24 includes a fourth connecting pipe 242, a transition connecting pipe 243, and a fifth connecting pipe 244, which are sequentially connected, the fourth connecting pipe 242 is connected to the second connecting ring 26, the fifth connecting pipe 244 is in a tapered structure, one end of the fifth connecting pipe 244 having a larger radial dimension is connected to the third connecting ring 27, the largest radial dimension of the fifth connecting pipe 244 is the same as the radial dimension of the fourth connecting pipe 242, and the communication hole group 241 is provided on a side wall of the fifth connecting pipe 244.

This arrangement can increase the rate of concrete entering from the concrete inlet 23 so that the gas-liquid mixture and the concrete can be sufficiently mixed.

In this embodiment, the second mixer 20 further includes a connection pipe 28, the connection pipe 28 is connected to the external connection pipe 25, and the connection pipe 28 is detachably connected to the main connection pipe 11; the shotcrete nozzle 30 comprises a concrete delivery tube 40, the concrete delivery tube 40 being detachably connected to the second coupling ring 26, the concrete delivery tube 40 being adapted to deliver concrete to the second mixing chamber 21.

The connecting pipe 28 is arranged and can be detachably connected with the main connecting pipe 11, wherein the connecting pipe 28 and the main connecting pipe 11 can be connected by bolts; providing a concrete delivery tube 40 enables the delivery of concrete into the cavity of the nipple 24.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shotcrete nozzle, comprising:

a first mixer (10), the first mixer (10) comprises a main connecting pipe (11) and a throat pipe (12), the main connecting pipe (11) is provided with a first mixing cavity (111) and fluid inlets (112) which are communicated with the first mixing cavity (111),

-a first mixing outlet (113), a portion of the throat (12) being located within the first mixing chamber (111), the throat (12) having a compressed air inlet (121), the compressed air inlet (121) being in communication with the first mixing chamber (111), the first mixing chamber (111) being for mixing compressed air entering from the compressed air inlet (121) with fluid entering from the fluid inlet (112);

a second mixer (20), the second mixer (20) and the first mixer (10) being detachably connected, the second mixer (20) having a second mixing chamber (21) and a second mixing outlet (22) and a concrete inlet (23) both communicating with the second mixing chamber (21), the first mixing outlet (113) communicating with the second mixing chamber (21), the second mixing chamber (21) being for mixing a mixed fluid entering from the first mixing chamber (111) and concrete entering from the concrete inlet (23);

a nozzle (30), the nozzle (30) and one end of the second mixer (20) being detachably connected, the nozzle (30) having a spray channel (31), the spray channel (31) being in communication with the second mixing outlet (22), the spray channel (31) being for spraying out the mixture in the second mixing chamber (21);

the number of the throats (12) is multiple, the sizes of the outlets of the throats (12) are different, and any one of the throats (12) is selectively detachably connected with the main connecting pipe (11).

2. The shotcrete nozzle according to claim 1, wherein the throat (12) comprises a first connecting ring (122) and a cone (123), the end of the cone (123) having a large radial dimension being connected to the first connecting ring (122), the end of the cone (123) having a small radial dimension being inserted into the main nozzle (11), the first connecting ring (122) having the compressed air inlet (121), the cone (123) having a communication chamber (1231), the compressed air inlet (121) being in communication with the first mixing chamber (111) through the communication chamber (1231), the first connecting ring (122) being detachably connected to the end of the main nozzle (11).

3. The shotcrete nozzle according to claim 1, wherein the main nozzle (11) comprises a first nozzle (114), a second nozzle (115) and a third nozzle (116), the first nozzle (114) and the second nozzle (115) being in communication in an axial direction of the first nozzle (114), the third nozzle (116) and the first nozzle (114) being in communication in a radial direction of the first nozzle (114), the first nozzle (114) having a first cavity, the second nozzle (115) having a second cavity and the first mixing outlet (113), the third nozzle (116) having a third cavity and the fluid inlet (112), a portion of the throat (12) being located in the first cavity, the second cavity being in communication with the third cavity, the first cavity and the second cavity forming the first mixing cavity (111), the throat (12) and the first nozzle (114) being detachable from the second nozzle (20).

4. A shotcrete nozzle according to claim 3, wherein said first connection tube (114) comprises a first sub connection tube (1141) and a second sub connection tube (1142) connected to each other, a radial dimension of said first sub connection tube (1141) being larger than a radial dimension of said second sub connection tube (1142), said throat (12) and said first sub connection tube (1141) being detachably connected, said second sub connection tube (1142) and said second connection tube (115) being connected, said third connection tube (116) and said first sub connection tube (1141) being connected.

5. The shotcrete nozzle according to claim 4, wherein the second connection tube (115) is of a conical configuration, wherein an end of the second connection tube (115) having a smaller radial dimension is connected to the second sub-connection tube (1142), and wherein an end of the second connection tube (115) having a larger radial dimension is detachably connected to the second mixer (20).

6. The shotcrete nozzle according to claim 1, characterized in that the second mixer (20) comprises an inner connecting tube (24), an outer connecting tube (25), a second connecting ring (26) and a third connecting ring (27), the outer connecting tube (25) is sleeved on the inner connecting tube (24), two ends of the inner connecting tube (24) are respectively connected with the second connecting ring (26) and the third connecting ring (27), two ends of the outer connecting tube (25) are respectively connected with the second connecting ring (26) and the third connecting ring (27), the second mixing chamber (21) is formed between the outer wall of the inner connecting tube (24), the inner wall of the outer connecting tube (25), the second connecting ring (26) and the third connecting ring (27), a communication hole group (241) communicated with the second mixing chamber (21) is arranged on the side wall of the inner connecting tube (24), the communication hole group (241) is communicated with a cavity in the inner connecting tube (24), the second connecting ring (26) is provided with the second connecting ring (26) and the third connecting ring (27), the second mixing chamber (26) is provided with the second mixing nozzle (30), and the second mixing ring (27) is provided with the outlet (30).

7. The shotcrete nozzle according to claim 6, wherein the communication hole group (241) comprises a first sub-hole (2411) and a second sub-hole (2412) which are arranged side by side in an axial direction of the inner joint pipe (24), the first sub-hole (2411) and the second sub-hole (2412) are each plural, and the first sub-hole (2411) and the second sub-hole (2412) are each plural and arranged at intervals in a circumferential direction of the inner joint pipe (24).

8. The shotcrete nozzle according to claim 7, wherein an angle between an axis of the first sub-bore (2411) or an axis of the second sub-bore (2412) and an axis of the inner pipe (24) is a,15 ° -a-30 °.

9. The shotcrete nozzle according to claim 6, wherein the inner connecting tube (24) comprises a fourth connecting tube (242), a transition connecting tube (243) and a fifth connecting tube (244) which are sequentially connected, the fourth connecting tube (242) is connected with the second connecting ring (26), the fifth connecting tube (244) is in a conical structure, one end of the fifth connecting tube (244) with a large radial dimension is connected with the third connecting ring (27), the maximum radial dimension of the fifth connecting tube (244) is the same as the radial dimension of the fourth connecting tube (242), and the communication hole group (241) is arranged on the side wall of the fifth connecting tube (244).

10. The shotcrete nozzle according to claim 6, wherein the second mixer (20) further comprises a communication connection tube (28), the communication connection tube (28) being in communication with the external connection tube (25), the communication connection tube (28) being detachably connected with the main connection tube (11); the shotcrete nozzle (30) comprises a concrete delivery tube (40), the concrete delivery tube (40) and the second connection ring (26) being detachably connected, the concrete delivery tube (40) being adapted to deliver concrete to the second mixing chamber (21).