An automatic pressure and humidity control porous dry and wet dual-purpose multi-functional gun

Abstract

The application provides an automatic pressure and humidity control porous dry and wet dual-purpose multifunctional gun, which comprises a supporting handle, a rotating rod and a control box, the supporting handle is clamped on the shoulder of a construction worker, the rotating rod comprises a rod body and a handle, one end of the rod body is rotatably connected with the supporting handle, the middle part is fixed with the handle, and the other end is provided with a feeding box, a liquid joint, a material joint, a spray head and a density sensor are arranged on the feeding box, the liquid joint is connected with a rear spraying machine through a liquid inlet pipe, the material joint is connected with the rear spraying machine through a feeding pipe, a plurality of spray holes arranged in a row are arranged on the spray head, the plurality of spray holes can simultaneously spray mixed slurry, the control box is arranged on the supporting handle and is provided with a display screen, a controller, a receiving module, a data processing module and a sending module, the application can be used for dry and wet, can cope with different engineering scenes, can control the spraying speed, can reduce the rebound amount of sprayed slurry, can reduce the operation difficulty of workers, can reduce the material amount and can reduce construction dust.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete spraying, in particular to an automatic pressure and humidity control porous dry and wet dual-purpose multifunctional spraying gun. BACKGROUND

[0002] In China, the geological conditions are complex and diverse. In the process of tunneling and mining, the surrounding rock with different stability states is difficult to achieve balance spontaneously. The pressure deformation and the development of local joint fissures can lead to surrounding rock damage, groundwater leakage, and other problems. The surrounding rock is easily deliquescent and weathered in the long-term exposure to air and humid environment, which can cause surrounding rock cracking, roof delamination, and collapse, etc. These problems seriously endanger the safety of the project and delay the progress of the project. In coal mines, the cracking of coal rock mass can lead to gas penetration and accumulation, causing safety hazards. In the construction of underground projects such as tunnels and coal mines, for III-V class surrounding rock (poor relative integrity of surrounding rock), it is necessary to close and support the surface in time after excavation to ensure the stability of the overall structure of the excavated surrounding rock. The traditional technology is to use cement spraying material to fill the cracks of surrounding rock, close the exposed surface of surrounding rock, improve the self-supporting force of surrounding rock and the linkage support capacity of passive support structure, avoid rock fall, and improve the stability of surrounding rock under different geological conditions. However, the traditional cement spraying material and construction process have many problems, such as large dust pollution during construction, which seriously affects the health of underground workers; the cement concrete spraying technology consumes a large amount of materials, which puts a lot of pressure on underground transportation; different spraying guns cannot be mixed; the spraying speed is difficult to control due to uneven material pressure and water-cement ratio; the rebound amount of spraying is large; and the spraying gun is difficult to move, etc. Therefore, an automatic pressure and humidity control porous dry and wet dual-purpose multifunctional spraying gun is needed to solve the above problems.

[0003] In the existing spraying technology, the spraying gun cannot be used for dry spraying and wet spraying at the same time, the spraying gun head is difficult to move, and the rebound amount of spraying is large during the spraying process, which seriously affects the effect and efficiency of the spraying project. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an automatic pressure and humidity control porous dry and wet dual-purpose multifunctional spraying gun, which can be used for dry and wet spraying, can cope with different engineering scenes, can realize one thing for multiple uses, can control the spraying speed, can reduce the rebound amount of spraying, can reduce the difficulty of worker operation, can save human resources, can reduce the amount of materials, and can reduce construction dust.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] An automatic pressure and humidity control porous dry and wet dual-purpose multifunctional spraying gun, comprising:

[0007] A supporting handle is clamped on the shoulder of a construction worker.

[0008] The rotating rod comprises a rod body and a handle, one end of the rod body is rotatably connected with the supporting handle, the middle part is fixed with the handle, and the other end is provided with a feeding box, the feeding box is provided with a liquid joint, a material joint, a spray head and a density sensor, the liquid joint is connected with the rear spray machine through a liquid inlet pipe, the material joint is connected with the rear spray machine through a feeding pipe, when wet spraying is needed, the liquid joint is connected with water, and the material joint is connected with the wet spraying material, when dry spraying is needed, the liquid joint is connected with the accelerator, and the material joint is connected with the dry spraying material, the spray head is provided with a plurality of spray holes arranged in a row, and the plurality of spray holes can simultaneously spray the mixed slurry.

[0009] The control box is arranged on the supporting handle, the control box is provided with a display screen, a controller, a receiving module, a data processing module and a sending module, the controller is connected with the display screen, the receiving module, the data processing module and the sending module, the receiving module receives the data of the density sensor and sends the data to the controller, the controller calculates and processes the data of the density sensor to obtain the optimal working air pressure, the optimal working air pressure is transmitted to the rear spray machine to adjust the feeding speed of the feeding pipe, and the display screen displays the data of the density sensor.

[0010] Further, the supporting handle is provided with an elastic band and a lock buckle, the elastic band is sleeved on the shoulder and arm of the construction personnel and locked by the lock buckle.

[0011] Further, the supporting handle is L-shaped.

[0012] Further, the feeding box is a right-angled trapezoidal block structure, the rear side of the feeding box is a slope, the upper part of the rear side of the feeding box is fixed with the other side of the rotating rod, and the lower part of the rear side of the feeding box is provided with the material joint, the upper side of the feeding box is provided with the liquid joint, and the front side of the feeding box is provided with the spray head.

[0013] Further, the spray head is provided with a detachable sleeve, and the sleeve is provided with a plurality of spray holes.

[0014] Further, the sleeve is provided with a first circular arc surface concave inward, a plurality of first spray holes are uniformly distributed and spaced apart at a certain distance on the first circular arc surface, and when the plurality of first spray holes simultaneously spray the mixed slurry, the slurry converges at the circular point of the first circular arc surface.

[0015] Further, the curvature radius of the first circular arc surface is 0.8 meters, 1.2 meters, 2 meters or 4 meters.

[0016] Further, the spray head is provided with a second circular arc surface convex outward, the second circular arc surface is provided with a second spray hole and a third spray hole, a plurality of third spray holes are symmetrically arranged on the two sides of the second spray hole, and the diameter of the second spray hole is greater than that of the third spray hole.

[0017] Further, the support handle is provided with a spherical groove, the rod is provided with a spherical joint, the spherical joint is embedded in the spherical groove, and the spherical joint is provided with a ball.

[0018] Further, the data processing module calculates and processes the process of obtaining hydraulic pressure and working air pressure as follows:

[0019] In the process of the mixed slurry being sprayed out of the spray hole to the target, the influence of gravity on the material in the vertical direction can be ignored due to the high speed and short distance, and the differential equation of Newton's second law is:

[0020] dF 阻 =m·da

[0021] wherein, F 阻 =k·v2 2 , c is the air resistance coefficient, s is the windward area, v2 is the speed of the material after being sprayed out of the spray hole, F 阻 is the air resistance, and m is the mass of the material;

[0022] which is further simplified as:

[0023]

[0024] wherein, Q is the flow of the material per second, Q=sv2, dt=dx / dv, p 材料 is the density of the mixed slurry, which is obtained by the density sensor, and p 空气 is the air density;

[0025] which is finally simplified as:

[0026]

[0027] Integrate both sides simultaneously:

[0028]

[0029] wherein, x is the distance of the spray head from the target, v3=0 is measured, and v2 is the speed when reaching the wall, so that v2 can be calculated;

[0030] When the mixed slurry is in the process of the spray head, the flow rate changes due to the fact that the cross section of the spray hole is smaller than the cross section of the pipe, and the following is obtained:

[0031] Q=s2v2=s1v1

[0032] wherein, s1 is the total cross section area of the plurality of spray holes, and s2 is the cross section area of the pipe, and v1 is calculated;

[0033] In the process of the material reaching the material access box to the spray head, the Bernoulli equation is:

[0034]

[0035] In the initial stage, v0=0, and the fluid is always on the same height streamline, so the gravitational potential energy does not change, P0 is the initial pressure potential energy, which provides the initial working wind pressure, which is input by the construction personnel;

[0036] Simplify as:

[0037]

[0038] The working wind pressure P1 after the first shotcrete change is calculated;

[0039] The pressure relationship formula at any time is derived from the Bernoulli equation:

[0040]

[0041] The working wind pressure P2 after the second shotcrete change is calculated by the difference equation.

[0042] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0043] (1) The automatic pressure and humidity control porous dry and wet dual-purpose multifunctional shotcrete gun provided by the present application can be used dry and wet, when the liquid connector is connected to water, the material connector is connected to the wet sprayed material, when the liquid connector is connected to the quick-setting agent, the material connector is connected to the dry sprayed material, since the dry and wet sprayed materials of the present application are sprayed out through the feed box and then through the spray hole, they can be mixed and used immediately, which is not easy to cause material waste and reduces transportation pressure.

[0044] (2) The automatic pressure and humidity control porous dry and wet dual-purpose multifunctional shotcrete gun provided by the present application can be placed on the shoulder of the construction personnel, which can greatly reduce the work fatigue degree of the workers, reduce the work burden and improve the work efficiency.

[0045] (3) The automatic pressure and humidity control porous dry and wet dual-purpose multifunctional shotcrete gun provided by the present application can real-time monitor the density of the mixed slurry through the density sensor, receive the data signal of the density sensor through the receiving module, calculate and process the hydraulic pressure and working wind pressure through the data processing module, transmit the obtained hydraulic pressure to the rear shotcrete machine to adjust the liquid inlet speed of the liquid inlet pipe, and transmit the obtained working wind pressure to the rear shotcrete machine to adjust the feeding speed of the feeding pipe, so as to real-time adjust the working wind pressure of the feeding pipe and the hydraulic pressure of the liquid outlet pipe provided by the rear shotcrete machine, make the shotcrete uniform, control the spraying speed, reduce the rebound amount of the shotcrete, reduce the operation difficulty of the workers and save human resources.

[0046] (4) The application provides an automatic pressure and humidity controlled multi-hole dry and wet dual-purpose multifunctional gun for spraying mortar, one end of a rod body is rotatably connected with a supporting handle, a construction worker can conveniently spray mortar without large-scale movement, the gun can be conveniently disassembled and carried, spraying work efficiency is improved, and spraying flexibility is improved. BRIEF DESCRIPTION OF DRAWINGS

[0047] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application, in which:

[0048] Figure 1 A three-dimensional model schematic view of an automatic pressure and humidity controlled multi-hole dry and wet dual-purpose multifunctional gun for spraying mortar is provided.

[0049] Figure 2 A top view of the application is provided.

[0050] Figure 3 A front view of the application is provided.

[0051] Figure 4 A sectional view of a rotary ball joint mechanism in the application is provided.

[0052] Figure 5 A schematic view of the overall structure of a material joint and a liquid joint in the application is provided.

[0053] Figure 6 An enlarged view of a multi-hole nozzle in the application is provided.

[0054] Figure 7 A partial enlarged view of an inner recess type multi-hole nozzle in the application is provided.

[0055] Figure 8 A partial enlarged view of an outer convex type multi-hole nozzle in the application is provided.

[0056] Wherein: 1, lock buckle; 2, plastic sponge; 3, supporting handle; 4, control box; 5, button; 6, display screen; 7, spherical joint; 8, handle; 9, rod body; 10, liquid joint; 11, liquid joint base; 12, feeding box; 13, nozzle; 14, material joint; 15, material joint base; 16, rotating rod; 17, sleeve; 18, first circular surface; 19, first spray hole; 20, second circular surface; 21, second spray hole; 22, third spray hole; 23, spherical groove; 24, ball. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the application.

[0058] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0059] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "connected", "connected", "abutted" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] The present application provides an automatic pressure and humidity control porous dry and wet dual-purpose multifunctional gun, as shown in Figures 1-3 It comprises a supporting handle 3, a rotating rod 16 and a control box 4.

[0061] The supporting handle 3 is clamped on the shoulder of the construction personnel.

[0062] The rotating rod 16 comprises a rod body 9 and a handle 8, one end of the rod body 9 is rotatably connected with the supporting handle 3, the middle part is fixed with the handle 8, and the other end is provided with a feeding box 12. The feeding box 12 is provided with a liquid joint 10, a material joint 14, a spray head 13 and a density sensor. The liquid joint 10 is connected with the rear spray machine through a liquid inlet pipe, the material joint 14 is connected with the rear spray machine through a feeding pipe. When wet spraying is needed, the liquid joint 10 is connected with water, and the material joint 14 is connected with the wet spraying material. When dry spraying is needed, the liquid joint 10 is connected with the accelerator, and the material joint 14 is connected with the dry spraying material. The density sensor is arranged in the spray head 13. The spray head 13 is provided with a plurality of spray holes arranged in a row. The plurality of spray holes can simultaneously spray the mixed slurry.

[0063] The control box 4 is arranged on the supporting handle 3, and the control box 4 is provided with a display screen 6, a controller, a receiving module, a data processing module and a sending module; the controller is connected with the display screen 6, the receiving module, the data processing module and the sending module; the receiving module receives data of the density sensor and sends the data to the controller; the controller calculates and processes the optimal working air pressure according to the data of the density sensor through the data processing module; the sending module transmits the obtained optimal working air pressure to the rear spraying machine to adjust the feeding speed of the feeding pipe; and the display screen 6 displays the data of the density sensor.

[0064] In use, when wet spraying is needed, the liquid connector 10 is connected to water, and the material connector 14 is connected to wet spraying material; when dry spraying is needed, the liquid connector 10 is connected to a quick-setting agent, and the material connector 14 is connected to dry spraying material; the supporting handle 3 is clamped on the shoulder of a construction worker; the rod body 9 is rotated in time according to needs, so that the nozzle is aligned with a target; in the process of spraying mixed slurry, the density of the mixed slurry is obtained through the density sensor; the optimal hydraulic pressure and the optimal working air pressure are calculated and processed by the data processing module according to the data of the density sensor; the optimal hydraulic pressure obtained by the sending module is transmitted to the rear spraying machine to adjust the liquid feeding speed of the liquid feeding pipe; the optimal working air pressure obtained by the sending module is transmitted to the rear spraying machine to adjust the feeding speed of the feeding pipe, so as to adjust the spraying speed of the mixed slurry, and the spraying speed is controlled at any time, so that the spraying speed is as possible as to adapt to the mortar layer after overcoming air resistance, and the rebound is minimized.

[0065] The automatic pressure and humidity control porous dry and wet dual-purpose multifunctional spraying gun provided by the application can be used for dry and wet spraying, the liquid connector 10 is connected to water when wet spraying is needed, and the material connector 14 is connected to wet spraying material; the liquid connector 10 is connected to a quick-setting agent when dry spraying is needed, and the material connector 14 is connected to dry spraying material; since the dry and wet spraying materials pass through the feeding box 12 and are sprayed through the spray hole, the materials can be used immediately after mixing, and the waste of materials is reduced, and the transportation pressure is reduced.

[0066] The automatic pressure and humidity control porous dry and wet dual-purpose multifunctional spraying gun provided by the application is placed on the shoulder of a construction worker, so that the working fatigue of workers can be greatly reduced, the working burden is reduced, and the working efficiency is improved.

[0067] The application provides an automatic pressure and humidity control porous dry and wet dual-purpose multifunctional gun, which realizes real-time monitoring of the density of mixed slurry through a density sensor, receives data signals of the density sensor through a receiving module, obtains hydraulic pressure and working air pressure through data processing, transmits the obtained hydraulic pressure to a rear gun to adjust the liquid inlet speed of a liquid inlet pipe, transmits the obtained working air pressure to the rear gun to adjust the material inlet speed of a material inlet pipe, and adjusts the working air pressure of the material outlet of the material inlet pipe and the hydraulic pressure of the liquid outlet of the liquid inlet pipe in real time, so that the slurry is uniformly sprayed, the spraying speed is controlled, the rebound amount of the slurry is reduced, the operation difficulty of workers is reduced, and human resources are saved.

[0068] The automatic pressure and humidity control porous dry and wet dual-purpose multifunctional gun provided by the application is characterized in that one end of the rod body 9 is rotatably connected with the supporting handle 3, so that the construction personnel can conveniently spray without large-scale movement, the gun can be conveniently disassembled and carried, the spraying work efficiency is improved, and the spraying flexibility is improved.

[0069] In the application, as shown in Figures 1-3 , the supporting handle 3 is provided with an elastic band and a lock buckle 1, the elastic band is sleeved on the shoulder and arm of the construction personnel and locked through the lock buckle 1.

[0070] In the application, the supporting handle 3 is L-shaped, when used, one side of the supporting handle 3 abuts against the back of the construction personnel, and the other side abuts against the shoulder of the user.

[0071] The plastic sponge 2 is arranged at the position where the supporting handle 3 abuts against the back of the construction personnel, and can better abut against the back.

[0072] In the embodiment of the application, the elastic band is provided with a telescopic buckle, one end of the elastic band is connected with one side of the supporting handle 3, the middle part of the elastic band passes through the armpit and is connected with the other side of the supporting handle 3, the telescopic buckle is strung on the elastic band, the length of the elastic band is changed, the elastic band is firmly fixed on the shoulder, and then the supporting handle 3 is fixed on the shoulder.

[0073] In the application, as shown in Figure 1 and Figure 2 , the control box 4 is provided with a button 5, the button 5 includes a first button and a second button, the liquid connector 10 is provided with a first electric valve, the material connector 14 is provided with a second electric valve, the controller is connected with the first button, the second button, the first electric valve and the second electric valve, the first electric valve is controlled to be opened and closed through the first button, the second electric valve is controlled to be opened and closed through the second button, and the construction personnel can conveniently open or close the material connector 14 or the liquid connector 10 in time.

[0074] In the application, the feeding box 12 is a right trapezoidal block structure, the rear side of the feeding box 12 is a slope, the upper part of the rear side of the feeding box 12 is fixed with the other side of the rotating rod 16, the lower part of the rear side is provided with a material joint, the upper side of the feeding box 12 is provided with a liquid joint, and the front side of the feeding box 12 is provided with a spray head 13.

[0075] In the application, as shown in the figure, the feeding box 12 is provided with a liquid joint base 11, the liquid joint base 11 is provided with a liquid joint 10, the feeding box 12 is provided with a material joint base 15, and the material joint base 15 is provided with a material joint 14. Figure 5

[0076] In the application, as shown in the figure, in order to adjust the spray head 13 in real time, the spray head 13 is provided with a detachable sleeve 17, and the sleeve 17 is provided with a plurality of spray holes, forming a multi-hole spray head. Figures 6-8

[0077] In an embodiment of the application, the spray head 13 is a concave multi-hole spray head, as shown in the figure, the sleeve 17 is provided with a first circular arc surface 18 which is concave inward, the first circular arc surface 18 is provided with a plurality of first spray holes 19 which are uniformly distributed and spaced apart at a certain distance, and when the plurality of first spray holes 19 simultaneously spray the mixed slurry, the slurry converges at the dot of the first circular arc surface 18. Figure 7

[0078] Specifically, the radius of curvature of the first circular arc surface 18 is 0.8 meters, 1.2 meters, 2 meters or 4 meters.

[0079] In another embodiment of the application, the spray head 13 is an outward convex multi-hole spray head, as shown in the figure, the sleeve 17 is provided with a second circular arc surface 20 which is convex outward, the second circular arc surface 20 is provided with a second spray hole 21 and a third spray hole 22, a plurality of third spray holes 22 are symmetrically arranged on both sides of the second spray hole 21, and the diameter of the second spray hole 21 is greater than that of the third spray hole 22. Figure 8

[0080] In the process of spraying, the third spray holes 22 on the left and right sides can improve the spraying efficiency and compensate for the insufficient spraying, the second spray hole 21 in the middle is the main spraying direction, and in the process of spraying, the second spray hole 21 and the third spray hole 22 are simultaneously sprayed horizontally, thereby improving the spraying efficiency.

[0081] ​​​​In the application, in order to improve the efficiency of shotcreting and the flexibility of shotcreting, the support handle 3 is provided with a spherical groove 23, the rod body 9 is provided with a spherical joint 7, the spherical joint 7 is embedded in the spherical groove 23, the spherical joint 7 is provided with a ball, so that the rod body 9 can rotate and twist freely with a large amplitude, so that the shotcreting gun can rotate and twist simultaneously.

[0082] The process of calculating and processing the hydraulic pressure and working air pressure by the data processing module is as follows:

[0083] In the process of spraying the mixed slurry out of the nozzle to the target, the influence of gravity on the material in the vertical direction can be ignored due to the high speed and short distance. According to the second law of Newton differential equation:

[0084] dF 阻 =m·da

[0085] Wherein, F 阻 =k·v2 2 , c is the air resistance coefficient, s is the windward area, v2 is the speed of the material after spraying out of the nozzle, F 阻 is the air resistance, m is the mass of the material;

[0086] Further simplified as:

[0087]

[0088] Wherein, Q is the flow rate of the material per second, Q=sv2, dt=dx / dv, p 材料 is the density of the mixed slurry, which is obtained by the density sensor, p 空气 is the air density;

[0089] Finally simplified as:

[0090]

[0091] Integrate both sides:

[0092]

[0093] Wherein, x is the distance from the nozzle to the target, v3=0 is measured, and v2 is the speed when reaching the wall, so v2 can be calculated;

[0094] When the mixed slurry is in the nozzle, the flow rate changes because the nozzle cross section is smaller than the pipe cross section, so:

[0095] Q=s2v2=s1v1

[0096] Wherein, s1 is the total cross-sectional area of the multiple nozzles, s2 is the cross-sectional area of the pipe, and v1 is calculated;

[0097] In the process of material arriving at the material access box to the nozzle, by Bernoulli equation:

[0098]

[0099] In the initial stage, v0=0, and the fluid is always on the same height streamline, so the gravitational potential energy does not change, P0 is the initial pressure potential energy, which provides the initial working wind pressure, which is input by the construction personnel;

[0100] Simplify as:

[0101]

[0102] Calculate the working wind pressure P1 after the first shot changes;

[0103] From the Bernoulli equation, the pressure relationship at any time is:

[0104]

[0105] Calculate the working wind pressure P2 after the second shot changes by using the difference equation.

[0106] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An automatic pressure and humidity control porous dry and wet dual-purpose multifunctional shotcrete gun, characterized in that, The utility model relates to a kind of automatic control pressure control wet multi-hole dry-wet dual-purpose multifunctional gun, including: Support handle, card set on the shoulder of construction personnel; Rotary rod, including stem and handle, stem one end is rotatably connected with support handle, middle part is fixed with handle, other end is equipped with feeding tank, the liquid connector, material connector, spray head and density sensor are equipped on the feeding tank, the liquid connector is connected with rear shotcreting machine by liquid inlet pipe, the material connector is connected with rear shotcreting machine by feeding pipe, when wet spraying is needed, the liquid connector is connected with water, the material connector is connected with wet spraying material, when dry spraying is needed, the liquid connector is connected with accelerator, the material connector is connected with dry spraying material, the spray head is equipped with multiple spray holes arranged in a row, multiple spray holes can simultaneously spray mixed slurry; Control box, set on support handle, the control box is equipped with display screen, controller, receiving module, data processing module and sending module, controller is connected with display screen, receiving module, data processing module and sending module, the data of density sensor is sent to controller by receiving module, the optimal working air pressure is obtained by controller according to the data of density sensor by data processing module, and the feeding speed of rear shotcreting machine adjusting feeding pipe is transmitted to the optimal working air pressure, and the data of density sensor is displayed on display screen; The process that the data processing module calculates and processes to obtain hydraulic pressure and working air pressure is as follows: In the process that mixed slurry reaches target after being sprayed from spray hole, gravity can be ignored in vertical direction due to fast speed and short distance, according to Newton's second law differential equation: wherein, , , is the air resistance coefficient, is the windward area, is the velocity of the material after being ejected from the nozzle, is the air resistance, is the material mass; Further simplify as: Where Q is the flow rate of the material in one second, , , is the density of the mixed slurry, obtained from the density sensor, is the density of air; Finally simplify as: Integrate simultaneously on both sides: wherein is the distance of the nozzle from the target, and , is the speed at which the wall is reached, from which the ; In the process that mixed slurry is in spray head, its flow rate changes due to the fact that spray hole cross section is smaller than pipe cross section, according to: wherein is the sum of the cross-sectional areas of the plurality of orifices, is the cross-sectional area of the pipe, calculated as ; In the process that material reaches material connector to spray head, according to Bernoulli equation: In the initial stage, , and the fluid is always on the same height streamline, so the gravitational potential energy is constant, is the initial pressure potential energy, which is provided by the construction personnel, and P0 is the initial working wind pressure. Simplify as: The working air pressure after the first shot change is calculated ; According to Bernoulli equation, pressure relationship formula at any time is as follows: Calculating optimal operating wind pressure with difference equations .

2. The automatic control pressure control wet multi-hole dry-wet dual-purpose multifunctional gun according to claim 1, wherein: The support handle is provided with an elastic band and a lock buckle, and the elastic band is sleeved on the shoulder and arm of the construction personnel and locked by the lock buckle.

3. The automatic control pressure control wet multi-hole dry-wet dual-purpose multifunctional gun according to claim 1, wherein: The support handle is L-shaped.

4. The automatic control pressure control wet multi-hole dry-wet dual-purpose multifunctional gun according to claim 1, wherein: The feeding tank is a right-angled trapezoidal block structure, the rear side of the feeding tank is a slope, the upper part of the rear side of the feeding tank is fixed with the other side of the rotary rod, and the lower part of the rear side of the feeding tank is provided with a material connector, the upper side of the feeding tank is provided with a liquid connector, and the front side of the feeding tank is provided with a spray head.

5. The automatic control pressure control wet multi-hole dry-wet dual-purpose multifunctional gun according to claim 1, wherein: The spray head is provided with a detachable kit, and the kit is provided with multiple spray holes.

6. The automatic control pressure control wet multi-hole dry-wet dual-purpose multifunctional gun according to claim 5, wherein: The kit is provided with a first inwardly recessed circular arc surface, a plurality of first spray holes are uniformly distributed and spaced apart on the first circular arc surface, and when the mixed slurry is sprayed from the plurality of first spray holes at the same time, the slurry converges at the circular point of the first circular arc surface.

7. The automatic pressure and humidity controlled multi-hole dry and wet dual-purpose spraying gun of claim 6, wherein: The radius of curvature of the first circular arc surface is 0.8 meters, 1.2 meters, 2 meters or 4 meters.

8. The automatic pressure and humidity controlled multi-hole dry and wet dual-purpose spraying gun of claim 1, wherein: The spray head is provided with a second outwardly protruding circular arc surface, a second spray hole and a third spray hole are provided on the second circular arc surface, a plurality of third spray holes are symmetrically provided on both sides of the second spray hole, and the diameter of the second spray hole is greater than that of the third spray hole.

9. The automatic pressure and humidity controlled multi-hole dry and wet dual-purpose spraying gun of claim 1, wherein: A spherical groove is provided on the support handle, a spherical joint is provided on the rod body, the spherical joint is embedded in the spherical groove, and a ball is provided on the spherical joint.

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