Transverse spiral feeding and spraying device

Abstract

The utility model provides a transverse spiral feeding jet device, which comprises a tank body, a spiral feeding mechanism, a jet mechanism and a controller, the spiral feeding mechanism is transversely connected to the lower end of the tank body, a feeding port of the spiral feeding mechanism is communicated with the tank body, and the jet mechanism comprises a receiving chamber, a pipeline mixer, an air inlet assembly and an air material conveying pipeline; a discharging port of the spiral feeding mechanism is communicated with an inlet of the receiving chamber, an outlet of the receiving chamber is communicated to the pipeline mixer, one end of the air inlet assembly is communicated with an external air source, and the other end of the air inlet assembly is communicated to the receiving chamber. And after being mixed and compressed by the pipeline mixer, the gas material is pneumatically conveyed into a drilling tool feeding channel of the drilling machine through the gas material conveying pipeline. According to the transverse spiral feeding jetting device, accurate and stable feeding is achieved for a construction feeding background through the intelligent controller, and the construction quality of a dry-method stirring pile is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of geotechnical engineering foundation treatment construction machinery and equipment, in particular to a transverse spiral feeding and injection device used for dry mixing pile construction for soft soil foundation reinforcement treatment. Background Art

[0002] Soft soil foundations are widely distributed in my country, especially in the sea, lake and river areas, where the foundation soil has a high moisture content, a large void ratio and high compressibility. For this type of soft soil foundation, land development requires a large amount of soft soil foundation engineering treatment. In the past 70 years, the traditional slurry-jetted mixing pile technology has been often used in the civil engineering industry to reinforce and treat this type of soft foundation. However, the strength and bearing capacity of the reinforced foundation obtained by using the slurry-jetted mixing pile construction technology and method to reinforce and treat this type of soft soil foundation often cannot meet the design purpose.

[0003] To this end, Nordic countries have developed dry mixing pile technology, which uses dry powder of curing agent such as lime or cement to reinforce saturated soft soil foundation. This technology and method are particularly suitable for foundation soil with high moisture content, large void ratio and high compressibility. The application of dry mixing pile technology in civil engineering can achieve good soft foundation reinforcement treatment effect through two ways of water absorption and curing. However, the existing dry mixing pile construction background mainly uses manually controlled feed tanks, general sprayers and material delivery pipeline equipment. During the construction process, powder feeding and spraying machine device operation are all done manually, which is completely based on the experience of workers. Due to the differences in the skill level and proficiency of construction personnel, powder feeding and spraying transportation often lead to uneven and unstable states, which is particularly prone to blockage of the transportation pipeline of curing materials, resulting in discontinuous feeding, spraying and transportation of curing agent powder in dry mixing pile construction, uneven curing agent spraying amount of construction drill, and difficult to guarantee the construction quality of the mixing pile body; and it will also cause waste of construction raw materials, labor and construction period.

[0004] The prior art has the following specific technical defects:

[0005] (1) The continuous feeding method of the ash tank used in dry mixing pile construction generally adopts the pneumatic or turntable method. The feeding speed and feeding amount are manually controlled by the construction personnel, and it is impossible to accurately control the feeding amount according to the design requirements. The amount of curing agent sprayed per unit pile length fluctuates greatly, and is even intermittent, sometimes more and sometimes less. The continuity of the pile body strength is poor and is far lower than the designed pile body strength. In particular, the phenomenon of no curing agent or less curing agent often occurs in the deep pile section.

[0006] (2) The structural design of the powder injection system is unreasonable. The powder fluidization pipeline and the conveying pipeline in front of the nozzle of the injection system are designed with equal diameters, which cannot generate a good gas-solid two-phase mixed vortex, reducing the pneumatic conveying capacity of the curing agent powder and making it difficult to meet the continuous and stable feeding requirements of the mixing pile construction drill. This will cause discontinuity in the pile body material and strength of the dry mixing pile, resulting in failure of drilling and core extraction of the dry mixing pile and unqualified quality inspection results.

[0007] (3) Due to the inability to accurately control the curing agent supply amount of the ash tank according to the design requirements, the structural design defects of the powder spraying machine system and the lack of intelligent control devices in the background of the dry mixing pile, the application of domestic dry mixing pile technology and methods is limited to within the range of 500mm diameter and 15m depth, which seriously limits the engineering application scope of dry spraying technology. In addition, due to the frequent engineering accidents of failing the engineering quality inspection, the use of dry mixing piles is restricted in many provinces, municipalities and autonomous regions.

[0008] The above-mentioned defects of the prior art will also lead to increased construction costs, including material costs, labor costs, time costs and engineering design change costs, resulting in a decline in the market competitiveness of dry mixing pile technology. Utility Model Content

[0009] The problem that the utility model solves is, in order to overcome at least one defect in the prior art, a transverse spiral feeding and injection device is provided, which provides a reliable and stable construction background equipment for dry mixing pile construction on soft soil foundation, and realizes automatic control of parameters such as feeding speed and feeding amount during the construction process.

[0010] In order to solve the above problems, the utility model provides a transverse spiral feeding and injection device, comprising a tank body, a spiral feeding mechanism, an injection mechanism and a controller, wherein the spiral feeding mechanism is transversely connected to the lower end of the tank body, the upper end of the tank body is provided with a feed port, and a switch valve 1 is provided at the feed port, and the feed port of the spiral feeding mechanism is connected with the tank body, the injection mechanism comprises a receiving chamber, a pipeline mixer, an air intake component and an air material conveying pipeline, the discharge port of the spiral feeding mechanism is connected with the inlet of the receiving chamber, the outlet of the receiving chamber is connected to the pipeline mixer, one end of the air intake component is connected with an external air source, and the other end is connected to the receiving chamber, the curing agent powder conveyed in the tank body is mixed and compressed by the pipeline mixer under the action of high-pressure gas injection, and then pneumatically conveyed to the drilling tool feed channel of the drilling rig through the air material conveying pipeline;

[0011] The air intake assembly includes a high-pressure air supply pipe, and the air outlet end of the high-pressure air supply pipe is connected to the receiving chamber; the tank body is connected to a pressure gauge 1 and a switch valve 2 for exhausting air from the exhaust port, and a switch valve 3 is provided at the connecting hole position between the lower end of the tank body and the feed port of the spiral feeding mechanism; the high-pressure air supply pipe is connected to a regulating valve, a safety valve 2, a pressure gauge 2 and a gas flow meter for controlling the intake air flow rate, and the high-pressure air supply pipe is connected to an air source switch, and the pressure gauge 1, the switch valve 2, the switch valve 3, the regulating valve, the switch valve 1, the pressure gauge 2, the gas flow meter and the air source switch are all connected to the electrical signal of the controller.

[0012] Compared with the prior art, the transverse spiral feeding injection device of the utility model has the following advantages:

[0013] The utility model is a stable, uniform and controllable discharging mechanism, and the transverse spiral feeding and injection device is a special background mechanism for dry mixing piles. It utilizes a controller to eliminate various technical drawbacks of the existing background equipment for dry mixing pile construction and its use, covers the problem of uniform quantitative discharging controllability of the tank body and the spiral conveying device to be solved, proposes a new structure of the injection machine system for gas-solid two-phase flow injection and a pipeline system capable of ensuring stable transportation of the gas-solid two-phase vortex. Finally, the purpose of supplying a stable and continuous mixed curing agent powder of the gas-solid two-phase fluid to the dry mixing pile construction drilling rig is achieved, ensuring that the dry mixing pile meets the design requirements in terms of overall pile body strength and single pile bearing capacity. In addition, it can also make substantial contributions to reducing material costs, labor costs and time costs. Specifically, through the automatic program control of the motor components, various switch valves, various pipeline pressure gauges and gas flow meters by the controller, including effective real-time monitoring and automatic control of various physical quantities, the background equipment can be automated and efficiently operated and quantitative feeding can be achieved. At the same time, the design pile diameter and pile length of the mixing pile construction are increased, and the construction quality of the dry mixing piles can be guaranteed, thereby greatly reducing the material cost, labor cost and time cost, improving the market competitiveness of the dry mixing pile technology and expanding the engineering application scope of the dry mixing piles.

[0014] As an improvement, a tank support is provided at the lower end of the tank body, a weighing sensor is connected to the upper end of the tank support, the outer wall of the tank body is supported on the weighing sensor, and the weighing sensor is connected to the controller via an electrical signal.

[0015] Further improved, the spiral feeding mechanism includes a shell, a screw and a motor assembly, the screw is rotatably connected in the shell, and the central axis of the screw coincides with the central axis of the shell; the motor assembly is transmission connected to one end of the screw, a spiral blade is provided on the outer wall of the screw, and the gap between the radial outer edge of the spiral blade and the inner circumferential wall of the shell is less than 2 mm; the motor assembly is connected to the controller via electrical signals.

[0016] Further improved, the receiving chamber is horn-shaped, and the inlet pipe of the receiving chamber is linearly connected to the shell, the air intake assembly is arranged in parallel below the shell, the outlet end of the air intake assembly extends into the outlet pipe of the receiving chamber, and is on the same axis as the inlet end of the pipeline mixer; the two ends of the screw are rotatably connected to the side walls of the shell and the receiving chamber through support bearing assemblies, and the motor assembly is axially connected to one end of the screw.

[0017] Further improved, the receiving chamber is cylindrical, and the two ends of the receiving chamber are respectively connected to the outer shell and the inlet of the pipeline mixer in a straight line; the screw is a hollow tube, one end of the screw is connected to the outlet of the high-pressure air supply pipe and is relatively rotatably connected, and the other end of the screw is connected to an ejector extending to the receiving chamber.

[0018] Further improved, the motor assembly includes a fixed seat, which is located between the high-pressure air supply pipe and the shell, a support bearing assembly is provided at one end of the shell away from the receiving chamber, a support frame is connected to the inner wall of the shell close to the receiving chamber, two ends of the screw are rotatably connected to the support bearing assembly and the support frame respectively; one end of the screw away from the receiving chamber can be rotatably passed through the fixed seat and connected to the outlet end of the high-pressure air supply pipe through a rotating joint; the outer wall of the fixed seat is connected to the motor assembly arranged vertically to the screw, a driving gear is connected to the power output end of the motor assembly and is located in the fixed seat, and a driven gear meshing with the driving gear is connected to the outer wall of the screw and is located in the fixed seat.

[0019] Further improved, the injector includes an injection pipe and a working nozzle, and the cross-sectional midlines of the injection pipe, the working nozzle and the pipeline mixer are on the same axis; the pipeline mixer includes a contraction tube, a mixing tube and a diffusion tube connected in sequence, and the outlet of the receiving chamber is connected with the inlet of the contraction tube; the contraction tube and the diffusion tube are both tapered tubes, the mixing tube is a cylindrical tube, the large diameter end of the contraction tube is connected with the outlet of the receiving chamber, the small diameter end of the contraction tube is connected with one end of the mixing tube, the other end of the mixing tube is connected with the small diameter end of the diffusion tube, and the large diameter end of the diffusion tube is connected with the inlet of the gas material conveying pipeline.

[0020] As a further improvement, the outlet end of the working nozzle is located in the receiving chamber at the right side of the perpendicular midline of the receiving chamber, and the diameter of the inner hole of the jet port of the working nozzle is a structure that first decreases and then increases.

[0021] In a further improvement, the tank body is a pressure vessel, and the lower end of the tank body is a conical structure with a larger upper portion and a smaller lower portion; a plurality of vibrators are connected to the conical inclined surface of the lower portion of the tank body.

[0022] Beneficial technical effects brought by the utility model:

[0023] 1. The utility model provides a transverse spiral feeding and injection device which is flexible in structure. The transverse spiral conveying device can adjust the horizontal angle of placement and is suitable for different construction site conditions. The spiral conveying device utilizes the regular distribution of spiral blades and the precise control of the rotation speed to realize the stable and uniform output of the curing agent powder in the tank body according to the designed output amount. The spiral conveying device adopts a close fit design between the spiral blades, which can ensure that the curing agent powder between the spiral blades does not flow back during construction, and a pressurized closed space is formed between the tank body and the receiving chamber of the injection mechanism, and the two pressurized spaces are not connected to each other, which effectively ensures that the gas-solid two-phase flow is quantitatively and stably transported to the construction drill feed channel through the pneumatic conveying method. The working nozzle can adopt different forms according to the construction requirements, so that the position of the working nozzle in the receiving chamber can be adjusted to achieve the best effect of injecting gas and material. If the screw of the spiral conveying device adopts a hollow structure and serves as a high-pressure gas channel, the conveying distance and the number of changes of direction of the gas and curing agent can be reduced, thereby effectively reducing the pressure loss in the injection mechanism.

[0024] 2. The utility model applies the mechanical functional principles of the jet structure and the experimental research results, and fully considers the pipeline chamber structural conditions that can generate swirl and pressurization of the gas-solid two-phase flow as well as the nozzle type and position conditions. Based on the test results and optimized design, a reasonable pipeline mixer type that reflects specific geometric characteristics and shape characteristics is determined, including a bullhorn-shaped receiving chamber (or a cylindrical receiving chamber), a pipeline mixer and a gas-material conveying pipeline, which ensures the generation of gas-solid two-phase swirl and the increase of the conveying pressure in the pipeline, thereby increasing the stable pneumatic conveying capacity of the gas-solid two-phase flow and avoiding the occurrence of pipe blockage, effectively ensuring the continuous and stable feeding construction of dry mixing piles.

[0025] 3. The structure of the utility model utilizes an intelligent controller to eliminate various technical drawbacks in the existing dry mixing pile construction background equipment and its use, covers the controllability problem of uniform quantitative discharge of the tank and the spiral conveying device to be solved, and proposes a new structure of the jet machine system for gas-solid two-phase flow injection and a pipeline system that can ensure the stable transportation of the gas-solid two-phase vortex; ultimately, the purpose of supplying a stable and continuous gas-solid two-phase fluid mixed curing agent powder to the dry mixing pile construction drilling rig is achieved, ensuring that the dry mixing pile meets the design requirements in terms of overall pile body strength and single pile bearing capacity. At the same time, the design pile diameter and The designed pile length expands the scope of engineering application; in addition, it can also make substantial contributions to reducing material costs, labor costs and time costs. Specifically, through the automatic program control of the controller on the driving mechanism, various switch valves, various pipeline pressure gauges and gas flow meters, including effective real-time monitoring and automatic control of various physical quantities, the background equipment can be automatically and efficiently operated and quantitatively and stably fed, ensuring the construction quality of dry-mixed piles, thereby greatly reducing material costs, labor costs and time costs, improving the market competitiveness of dry-mixed pile technology and expanding the scope of engineering application of dry-mixed piles.

[0026] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of the transverse spiral feeding and injection device of the first embodiment of the utility model;

[0028] Figure 2 This is a structural diagram of the connection between the spiral feeding mechanism and the air intake assembly in the first embodiment of the utility model;

[0029] Figure 3 It is a structural schematic diagram of the injection mechanism in the first embodiment of the utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the ejector in the first embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of the process structure of a transverse spiral feeding and injection device according to an embodiment of the utility model;

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of the transverse spiral feeding and injection device of the second embodiment of the utility model;

[0033] Figure 7This is a structural diagram of the connection between the spiral feeding mechanism and the air intake assembly in the second embodiment of the present utility model;

[0034] Figure 8 This is a schematic diagram of the structure of the motor assembly in the second embodiment of the present utility model;

[0035] Fig. 9 for Figure 7 AA section view in the figure;

[0036] Fig.10 This is a schematic diagram of the three-dimensional structure of the transverse spiral feeding and injection device of the third embodiment of the utility model;

[0037] Fig.11 This is a structural diagram of the connection between the spiral feeding mechanism and the air intake assembly in the third embodiment of the present utility model;

[0038] Fig.12 It is a structural schematic diagram of the injection mechanism in the third embodiment of the present utility model.

[0039] Description of reference numerals:

[0040] 1. Tank; 2. Screw feeding mechanism; 3. Controller; 4. Injection mechanism; 6. Tank support; 7. Feed barrel; 12. Drilling tool; 13. Feed inlet; 14. Switch valve 1; 15. Switch valve 3; 16. Pressure gauge 1; 17. Tank booster pipe; 19. Exhaust port; 20. Switch valve 2; 21. Weighing sensor; 22. Vibrator; 23. Motor assembly; 24. Screw; 25. Spiral blade; 26. Housing; 27. Support bearing assembly; 28. Pressure gauge 2; 29. ​​Gas flow meter; 30. Switch valve 4; 31. Installation Full valve one; 32, safety valve two; 33, regulating valve; 50, air source switch; 51, high-pressure air supply pipe; 52, receiving chamber; 521, inlet pipe; 522, outlet pipe; 53, working nozzle; 531, jet nozzle; 54, pipeline mixer; 541, contraction tube; 542, mixing tube; 543, diffusion tube; 55, gas material conveying pipeline; 56, air compressor; 57, air storage tank; 58, injection pipe; 63, rotary joint; 64, bushing; 70, fixed seat; 71, driving gear; 72, driven gear; 73, support frame. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] In the description of the present invention, it should be noted that the terms "upper end", "lower end", "inside and outside", "top", "bottom", "outer wall" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Embodiment 1:

[0045] like Figures 1 to 4 As shown, the utility model provides a transverse spiral feeding and injection device, including a tank body 1, a spiral feeding mechanism 2, an injection mechanism 4 and a controller 3. The tank body 1 is a pressure vessel, and a feed port 13 is arranged on the top of the tank body 1, and a switch valve 14 is arranged at the position of the feed port 13, and the opening and closing of the switch valve 14 are realized by opening and closing the switch valve 14 to open the feeding and close the sealing; the internal pressure setting value of the tank body 1 is 0.3MPa, and the volume of the tank body 1 is not less than 1.2 times the volume of the curing agent powder required for 2 construction piles; the lower part of the tank body 1 is a conical structure with a large upper end and a small lower end, and the cone angle is about 70°.

[0046] In addition, the spiral feeding mechanism 2 is laterally connected to the lower end of the tank body 1, and the lower barrel 7 of the spiral feeding mechanism 2 is connected to the tank body 1. The injection mechanism 4 includes a receiving chamber 52, a pipeline mixer 54, an air intake assembly and an air material conveying pipeline 55. The discharge port of the spiral feeding mechanism 2 is connected to the inlet of the receiving chamber 52, and the outlet of the receiving chamber 52 is connected to the pipeline mixer 54. One end of the air intake assembly is connected to an external air source, and the other end is connected to the receiving chamber 52. The curing agent powder transported in the tank body 1 is mixed and compressed by the pipeline mixer 54 under the action of high-pressure gas injection, and then pneumatically transported to the feed channel of the drilling tool 12 of the drilling rig through the air material conveying pipeline 55.

[0047] In this embodiment, a tank support 6 is provided at the lower end of the tank body 1, and a weighing sensor 21 is connected to the upper end of the tank support 6. The outer wall of the tank body 1 is supported on the weighing sensor 21, and the weighing sensor 21 is connected to the controller 3 by electrical signals. Specifically, the outer wall of the tank body 1 is mounted on the tank support 6 through three fulcrums, and a weighing sensor 21 is placed at each fulcrum position, which is used to monitor the weight change of the tank body 1 in real time and transmit the data to the controller 3 in real time; then the controller 3 controls the spiral feeding mechanism 2 to ensure that the output of the curing agent powder is uniform and accurate. The upper cover of the tank body 1 is in a curved shape, the internal pressure setting value of the tank body 1 is 0.3MPa, and the cone angle of the lower part of the tank body 1 is 70°. Specifically, in the above structure, three vibrators 22 are installed on the outer wall of the cone structure at the lower end of the tank body 1, in order to facilitate the smooth falling of the powder in the tank body 1 through the vibration of the vibrator 22.

[0048] like Figure 2 As shown, the spiral feeding mechanism 2 includes a shell 26, a screw 24 and a motor assembly 23, the screw 24 is rotatably connected in the shell 26, and the central axis of the screw 24 coincides with the central axis of the shell 26; the motor assembly 23 is transmission-connected to one end of the screw 24, and a spiral blade 25 with an outer diameter of 150 mm is arranged on the outer wall of the screw 24, and only a gap of less than 2 mm is left between the radial outer edge of the spiral blade 25 and the inner wall of the shell 26, so as to better ensure the feeding effect; on the other hand, during construction, it can be ensured that the curing agent powder between the spiral blades 25 does not flow back, and a pressurized closed space is formed between the tank body 1 and the receiving chamber 52 of the injection mechanism 4, and the two pressurized spaces are not connected to each other, which effectively ensures that the gas-solid two-phase flow is quantitatively and stably transported to the feeding channel of the construction drilling tool 12 through pneumatic conveying; on the other hand, the above-mentioned motor assembly 23 is connected to the controller 3 by electrical signals, so as to realize the intelligent control of the feeding process.

[0049] In this embodiment, the outer shell 26 is distributed horizontally and is at a vertical angle to the central axis of the tank body 1. Specifically, a discharge barrel 7 is connected to the lower end of the tank body 1, the upper end of the discharge barrel 7 is connected to the lower end of the conical structure, the lower end of the discharge barrel 7 is connected to the feed port on the upper side wall of one end of the outer shell 26, and the switch valve 3 15 is arranged at this connection to control the opening and closing of the discharge port.

[0050] Specifically, in this embodiment, Figure 3As shown, the receiving chamber 52 is in a bull horn shape, and the inlet pipe 521 of the receiving chamber 52 is linearly connected to the outer shell 26, the air intake assembly is arranged in parallel below the outer shell 26, and the outlet end of the air intake assembly extends into the outlet pipe 522 of the receiving chamber 52, and is on the same axis as the inlet end of the pipeline mixer 54; in addition, the two ends of the screw 24 are rotatably connected to the outer shell 26 and the side walls of the receiving chamber 52 through the support bearing assembly 27, specifically, the support bearing assembly 27 is provided at the end of the outer shell 26 away from the receiving chamber 52 and the end of the receiving chamber 52 away from the outer shell 26, and the two support bearing assemblies 27 are symmetrically distributed in the horizontal direction, the two ends of the screw 24 are rotatably connected to the two support bearing assemblies 27, and the motor assembly 23 is axially connected to one end of the screw 24.

[0051] like Figure 2 As shown, the ejector includes an ejection pipe 58 and a working nozzle 53, and the cross-sectional midlines of the ejection pipe 58, the working nozzle 53 and the pipeline mixer 54 are on the same axis; the pipeline mixer 54 includes a contraction pipe 541, a mixing pipe 542 and a diffusion pipe 543 connected in sequence, and the outlet of the receiving chamber 52 is connected to the inlet of the contraction pipe 541; the contraction pipe 541 and the diffusion pipe 543 are both tapered pipes, and the mixing pipe 542 is a cylindrical pipe. The large diameter end of the contraction pipe 541 is connected to the outlet of the receiving chamber 52, the small diameter end of the contraction pipe 541 is connected to one end of the mixing pipe 542, the other end of the mixing pipe 542 is connected to the small diameter end of the diffusion pipe 543, and the large diameter end of the diffusion pipe 543 is connected to the inlet of the gas-material conveying pipeline 55. Specifically, the pipeline mixer 54 adopts a reduced diameter-equal diameter-expanded diameter structure, which is conducive to the formation of gas-solid two-phase swirl and supercharging, and smoothly realizes the functions of gas supply, measurement and control, material discharge, injection, gas-solid two-phase flow mixing compression fluidization and supercharging with good sealing.

[0052] like Figure 5 As shown, when the feed injection device of this embodiment is used in actual engineering, an air compressor 56 and an air tank 57 are connected to the front end of the air intake assembly, and the high-pressure gas generated by air compression first passes through the air tank 57, and then provides 0.6MPa high-pressure gas to the working nozzle 53 via the high-pressure air supply pipe 51; the gas material conveying pipeline 55 uses pneumatic conveying to transport the mixed compressed and pressurized gas-solid two-phase flow medium to the feed channel of the drilling tool 12; in addition, the tank body booster pipe 17, which is partially diverted from the high-pressure air supply pipe 51, provides 0.3MPa high-pressure gas to the tank body 1 to ensure that the curing agent powder in the tank body 1 can be discharged smoothly.

[0053] More specifically, in the above structure, the outlet end of the working nozzle 53 is located on the right side of the mid-vertical line of the receiving chamber 52 , and the front end position of the working nozzle 53 can be adjusted by changing the length of the injection pipe 58 .

[0054] As another important parameter, Figure 4 As shown, the diameter of the jet port 531 of the working nozzle 53 in this embodiment is a structure that first shrinks and then increases. The inner diameter of the nozzle end of the working nozzle 53 is selected to be 13 mm and the enlarged cone angle of the inner diameter of the nozzle is selected to be 3°. When the length and structure of the working nozzle 53 are determined, it is required that at the vertical section of the circular through hole at the inlet end of the contraction tube 541, the diameter of the high-speed high-pressure gas jet beam ejected by the working nozzle 53 must be smaller than the diameter of the circular through hole, so that the high-pressure gas jet beam can be fully injected into the contraction tube 541 without generating a reflection effect. At the same time, a negative pressure area is formed in the receiving chamber 52, and the curing agent powder in the receiving chamber 52 is gradually sucked into the mixer through the induced jet flow around the high-pressure gas jet beam.

[0055] In the above structure, the flow rate and pressure of the high-pressure gas jet beam of the working nozzle 53 entering the contraction tube 541 are much higher than the flow rate and pressure of the curing agent powder flow around it, forming a non-uniform flow field in the contraction tube 541 area. As the inner diameter of the contraction tube 541 gradually decreases and the friction of the tube wall of the mixing tube 542 continues to increase, the high-pressure gas and the curing agent powder are gradually mixed, compressed and fluidized. The flow rate of the gas-solid two-phase mixed fluid on each cross section of the central axis of the mixing tube 542 with equal inner diameter gradually tends to be evenly distributed, and the flow rate on the outlet cross section of the mixing tube 542 is close to uniform distribution. The high-pressure gas and the curing agent powder are mixed and compressed and fluidized in the mixing tube 542 to form a vortex and enter the diffuser 543. When the gas-solid two-phase fluid with a relatively uniform flow rate flows through the diffuser 543, the dynamic pressure of the fluid in the tube will be increased, and then the gas-solid two-phase fluid enters the right end gas-material conveying pipeline 55, and then continues to be conveyed to the feed channel of the drilling tool 12 by pneumatic conveying.

[0056] More specifically, in the present embodiment, the air intake assembly includes a high-pressure air supply pipe 51 and a tank body pressurizing pipe 17, wherein the air outlet end of the high-pressure air supply pipe 51 is connected to the receiving chamber 52, one end of the tank body pressurizing pipe 17 is connected to the high-pressure air supply pipe 51 through a three-way pipe, and the other end is connected to the top of the tank body 1 for pressurizing the tank body 1, and a switch valve 4 30 is connected to the tank body pressurizing pipe 17 for controlling the connection and closing of the air path; in addition, a pressure gauge 16 and an exhaust port 19 are also provided on the top of the tank body 1, and the exhaust port 19 is opened, closed and sealed by a switch valve 20, and the exhaust port 19 can be used to discharge the air in the tank body 1 during feeding to keep the pressure inside the tank body 1 balanced with the outside. A switch valve 3 15 is provided at the communicating hole between the lower end of the tank body 1 and the feed port of the spiral feeding mechanism 2; a regulating valve 33, a safety valve 2 32, a pressure gauge 2 28 and a gas flow meter 29 are connected to the high-pressure gas supply pipe 51; a gas source switch 50, a switch valve 4 30, a pressure gauge 1 16, a switch valve 2 20, a switch valve 3 15, a regulating valve 33, a switch valve 1 14, a pressure gauge 2 28, a gas flow meter 29 and a gas source switch 50 are connected to the high-pressure gas supply pipe 51, and all are connected to the controller 3 by electrical signals. The controller 3 monitors the pressure in the tank body 1 and maintains the designed pressure value through the pressure gauge 1 16 and the switch valve 4 30.

[0057] During the construction process, the controller 3 is responsible for the monitoring, control and operation of the feeding injection device, that is, the PLC control program of the controller 3 is used to control the pressure in the tank 1, the designed rotation speed of the spiral feeding mechanism 2 and the designed amount of curing agent powder discharged, and the injection pressure and flow rate of the working nozzle 53; thereby ensuring the continuous and stable delivery of curing agent powder to the feed channel of the drilling tool 12 through the gas delivery pipeline 55; at the same time, the controller 3 is responsible for the measurement and opening and closing control of the gas flow meter 29, the gas source switch 50 and each switch valve. The application of the intelligent controller 3 covers the measurement, control and operation of each mechanism of the overall equipment.

[0058] Combined with Figure 5 When a transverse spiral feeding and injection device involved in this embodiment is used, it includes the following steps:

[0059] S1: Preparation of curing agent powder; open the switch valve 14 on the feed port 13 of the tank body 1 and the switch valve 2 20 on the exhaust port 19, and add a set amount of curing agent powder into the tank body 1; close the switch valve 14 and the switch valve 2 20;

[0060] S2: According to the process requirements, the controller 3 turns on the gas source switch 50 and the external air compressor 56, pressurizes the tank body 1 through the tank body pressurization pipe 17, and keeps the pressure in the tank body 1 at the set value; during the pressurization process, the pressure gauge 16 is used to monitor the internal pressure of the tank body 1. When the internal pressure of the tank body 1 is greater than the set pressure, the safety valve 31 will automatically open to release the pressure to ensure that the internal pressure of the tank body 1 is maintained at the set value; at the same time, high-pressure air is delivered to the working nozzle 53 through the high-pressure air supply pipe 51, and the controller 3 monitors the gas flow and pressure in the high-pressure air supply pipe 51 through the gas flow meter 29, the pressure gauge 28 and the regulating valve 33;

[0061] S3: After the gas delivery volume reaches the process requirement, the controller 3 is used to open the switch valve 3 15, and the motor assembly 23 is started to drive the screw 24 to rotate and deliver the curing agent powder falling in the tank body 1 to the receiving chamber 52; at the same time, the weight change of the curing agent powder in the tank body 1 is monitored and recorded in real time by the weighing sensor 21; when the curing agent powder in the tank body 1 enters the receiving chamber 52, the working nozzle 53 sprays high-pressure gas to the front, and sucks the curing agent powder into the pipeline mixer 54 by the induced flow method, and the gas-solid two-phase flow is mixed, compressed and pressurized to form a vortex and enter the gas delivery pipeline 55, and continues to deliver the gas-solid two-phase flow medium into the feed channel of the drilling tool 12 by pneumatic conveying;

[0062] S4: After the pile construction is completed by rotating and jetting the drill rig's drill bit 12, a high-quality dry-mixed pile is formed in the foundation soil by using a two-mixing and one-spraying drilling and powder spraying process, and the motor assembly 23, the switch valve 3 15 and the air source switch 50 are turned off by the controller 3 to stop the material and air supply;

[0063] S5: Move the construction drilling rig to a new pile position, and repeat the above process steps S1 to S4 to carry out material feeding for the next mixing pile construction.

[0064] Embodiment 2:

[0065] like Figures 6 to 9 As shown, in this embodiment, the bottom cone angle of the tank body 1 is 85°, and the set pressure value of the tank body 1 is 0.25MPa. Since the volume of the solidified material used for the single mixing pile is 3.6 cubic meters, the volume of the tank body 1 is 8 cubic meters, which can ensure the continuous feeding of two mixing piles. The upper cover of the tank body 1 is in a flat form, and four vibrators 22 are arranged on the conical inclined surface at the bottom of the tank body 1, which are responsible for vibrating the powder when unloading. The tank body bracket 6 has a total of four supporting points to support the tank body 1.

[0066] Another structural form, based on the first embodiment, the shape of the receiving chamber 52 is changed in this embodiment to be set into a cylindrical structure, and the two ends of the receiving chamber 52 are respectively connected to the housing 26 and the inlet of the pipeline mixer 54 in a straight line; the screw 24 is a hollow tube, one end of the screw 24 is connected to the outlet of the high-pressure air supply pipe 51 and is relatively rotatably connected, and the other end of the screw 24 is connected to an ejector extending to the receiving chamber 52, such as Figure 7 shown.

[0067] In addition, the connection method of the motor assembly 23, the air intake assembly and the housing 26 in this embodiment is completely different from that in the first embodiment. Figure 8 As shown, the motor assembly 23 includes a fixing seat 70, which is located between the high-pressure air supply pipe 51 and the housing 26. A support bearing assembly 27 is provided at one end of the housing 26 away from the receiving chamber 52. A support frame 73 is connected to the inner wall of the housing 26 close to the receiving chamber 52. The two ends of the screw 24 are rotatably connected to the support bearing assembly 27 and the support frame 73 respectively; a shaft sleeve 64 is installed in the center hole of the support frame 73 to facilitate the rotation connection of the screw 24, as shown in FIG. Fig. 9 As shown. The end of the screw 24 away from the injector can be rotated to pass through the fixed seat 70 and connected to the outlet end of the high-pressure air supply pipe 51 through a rotary joint 63; the outer wall of the fixed seat 70 is connected to a motor assembly 23 that is vertically distributed with the screw 24, and the power output end of the motor assembly 23 is connected to a driving gear 71 located in the fixed seat 70, and the outer wall of the screw 24 is connected to a driven gear 72 that meshes with the driving gear 71. In this structure, the driving gear 71 and the driven gear 72 are vertically arranged bevel gear structures, and the rotation of the driven gear 72 drives the screw 24 to rotate, and the high-pressure air supply pipe 51 is kept fixed under the action of the rotary joint 63. In this structure, the hollow screw 24 directly acts as an air supply pipe and is straightly connected to the receiving chamber 52, ensuring that the spiral feeding direction and the high-pressure air supply direction are on the same axis, ensuring that the curing agent powder and the high-pressure gas can be mixed more fully.

[0068] Preferably, in this embodiment, the outer shell 26 and the bottom of the tank body 1 are arranged at an inclined angle of 15° downward, so as to better ensure that the curing agent powder in the outer shell 26 is smoothly transported to the receiving chamber 52.

[0069] Embodiment three:

[0070] like Figures 10-12As shown, in this embodiment, the internal pressure design value of the tank body 1 is 0.32MPa. Since the volume of the solidifying material used for a single mixing pile is 2 cubic meters, the volume of the tank body 1 used is 5 cubic meters, which can ensure the continuous feeding of 26 mixing piles. Two vibrators 22 are provided on the 65° conical slope at the bottom of the tank body 1, which is conducive to the vibration downward of the curing agent powder. The tank body bracket 6 of the tank body 1 is provided with three supporting points to support the tank body 1, and each supporting point is provided with a weighing sensor 21 to monitor and record the real-time weight of the powder in the tank to ensure the quantitative and uniform feeding of the curing agent powder.

[0071] Preferably, in this embodiment, the spiral feeding mechanism 2 is arranged at the bottom of the tank body 1 in an upwardly inclined manner, with an upwardly inclined angle of 20°, and a diameter of the spiral blade 25 of 170 mm. Such a mechanism arrangement provides a larger operating space in the vertical direction for the structural connection between the spiral feeding mechanism 2 and the receiving chamber 52 and the air intake assembly.

[0072] The other structures of this embodiment are the same as those of the first embodiment and will not be described again here.

[0073] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A transverse spiral feeding injection device, characterized in that: The invention comprises a tank body (1), a spiral feeding mechanism (2), an injection mechanism (4) and a controller (3), wherein the spiral feeding mechanism (2) is transversely connected to the lower end of the tank body (1), the upper end of the tank body (1) is provided with a feed port (13), and a switch valve (14) is provided at the feed port (13), and the feed port (13) of the spiral feeding mechanism (2) is connected to the tank body (1), and the injection mechanism (4) comprises a receiving chamber (52), a pipeline mixer (54), an air intake component and an air-material The delivery pipeline (55) is connected to the delivery port of the spiral delivery mechanism (2) and the delivery port of the receiving chamber (52). The delivery port of the receiving chamber (52) is connected to the pipeline mixer (54). One end of the air inlet assembly is connected to an external air source, and the other end is connected to the receiving chamber (52). The curing agent powder delivered from the tank body (1) is mixed and compressed by the pipeline mixer (54) under the action of high-pressure gas injection and then pneumatically delivered to the feed channel of the drilling tool (12) of the drilling rig through the air delivery pipeline (55). The air intake assembly comprises a high-pressure air supply pipe (51), the air outlet end of the high-pressure air supply pipe (51) is connected to the receiving chamber (52), the tank body (1) is connected with a pressure gauge 1 (16) and a switch valve 2 (20) for exhausting the air from the exhaust port (19), and a switch valve 3 (15) is arranged at the position of the connecting hole between the lower end of the tank body (1) and the feed port of the spiral feeding mechanism (2); the high-pressure air supply pipe (51) is connected with a regulating valve (33) for controlling the air intake flow rate, a safety valve 2 (32), a pressure gauge 2 (28) and a gas flow meter (29), the high-pressure air supply pipe (51) is connected with a gas source switch (50), and the pressure gauge 1 (16), the switch valve 2 (20), the switch valve 3 (15), the regulating valve (33), the switch valve 1 (14), the pressure gauge 2 (28), the gas flow meter (29) and the gas source switch (50) are all connected to the controller (3) in terms of electrical signals.

2. The transverse spiral feeding and injection device according to claim 1 is characterized in that: A tank support (6) is provided at the lower end of the tank body (1), a weighing sensor (21) is connected to the upper end of the tank support (6), the outer wall of the tank body (1) is supported on the weighing sensor (21), and the weighing sensor (21) is connected to the controller (3) via an electrical signal.

3. The transverse spiral feeding and injection device according to claim 1 is characterized in that: The spiral feeding mechanism (2) comprises a housing (26), a screw (24) and a motor assembly (23); the screw (24) is rotatably connected in the housing (26), and the central axis of the screw (24) coincides with the central axis of the housing (26); the motor assembly (23) is transmission-connected to one end of the screw (24); a spiral blade (25) is provided on the outer wall of the screw (24), and the gap between the radial outer edge of the spiral blade (25) and the inner circumferential wall of the housing (26) is less than 2 mm; the motor assembly (23) is electrically signal-connected to the controller (3).

4. The transverse spiral feeding and injection device according to claim 3 is characterized in that: The receiving chamber (52) is in the shape of a bull horn, and the inlet pipe (521) of the receiving chamber (52) is linearly connected to the outer shell (26). The air intake assembly is arranged in parallel below the outer shell (26), and the outlet end of the air intake assembly extends into the outlet pipe (522) of the receiving chamber (52) and is on the same axis as the inlet end of the pipeline mixer (54); the two ends of the screw (24) are rotatably connected to the side walls of the outer shell (26) and the receiving chamber (52) through the support bearing assembly (27), and the motor assembly (23) is axially connected to one end of the screw (24).

5. The transverse spiral feeding and injection device according to claim 3 is characterized in that: The receiving chamber (52) is cylindrical, and the two ends of the receiving chamber (52) are respectively connected in a straight line to the housing (26) and the inlet of the pipeline mixer (54); the screw (24) is a hollow tube, one end of the screw (24) is connected to the outlet of the high-pressure air supply pipe (51) and is connected to rotate relative to it, and the other end of the screw (24) is connected to an ejector extending to the receiving chamber (52).

6. The transverse spiral feeding and injection device according to claim 5 is characterized in that: The motor assembly (23) comprises a fixing seat (70), the fixing seat (70) being located between the high-pressure air supply pipe (51) and the housing (26); a support bearing assembly (27) is provided at one end of the housing (26) away from the receiving chamber (52); a support frame (73) is connected to the inner wall of the housing (26) close to the receiving chamber (52); two ends of the screw rod (24) are rotatably connected to the support bearing assembly (27) and the support frame (73); the screw rod (24) is away from the receiving chamber (52) and the inner wall of the housing (26) close to the receiving chamber (52); One end of the screw (52) can be rotatably passed through the fixing seat (70) and connected to the outlet end of the high-pressure air supply pipe (51) via a rotating joint (63); the outer wall of the fixing seat (70) is connected to the motor assembly (23) arranged vertically with the screw rod (24); the power output end of the motor assembly (23) is located in the fixing seat (70) and is connected to a driving gear (71); the outer wall of the screw rod (24) is located in the fixing seat (70) and is connected to a driven gear (72) meshing with the driving gear (71).

7. The transverse spiral feeding and injection device according to claim 5 or 6, characterized in that: The ejector comprises an ejection pipe (58) and a working nozzle (53), and the cross-sectional midlines of the ejection pipe (58), the working nozzle (53) and the pipeline mixer (54) are on the same axis; the pipeline mixer (54) comprises a contraction tube (541), a mixing tube (542) and a diffusion tube (543) connected in sequence, and the outlet of the receiving chamber (52) is connected to the inlet of the contraction tube (541); the contraction tube (541) and the diffusion tube (543) are both tapered tubes, the mixing tube (542) is a cylindrical tube, the large diameter end of the contraction tube (541) is connected to the outlet of the receiving chamber (52), the small diameter end of the contraction tube (541) is connected to one end of the mixing tube (542), the other end of the mixing tube (542) is connected to the small diameter end of the diffusion tube (543), and the large diameter end of the diffusion tube (543) is connected to the inlet of the gas material conveying pipeline (55).

8. The transverse spiral feeding and injection device according to claim 7 is characterized in that: The outlet end of the working nozzle (53) is located in the receiving chamber (52) to the right of the perpendicular midline of the receiving chamber (52), and the inner hole diameter of the jet port (531) of the working nozzle (53) is in a structure that first decreases and then increases.

9. The transverse spiral feeding and injection device according to claim 1, characterized in that: The tank body (1) is a pressure vessel, and the lower end of the tank body (1) is a conical structure with a larger upper portion and a smaller lower portion; a plurality of vibrators (22) are connected to the conical inclined surface at the lower portion of the tank body (1).

Images