A multi-mode cooperative air lock type quantitative feeding powder injection pile background

Abstract

The utility model discloses a kind of powder spray pile background of multi-mode collaborative airlock type quantitative feeding. It aims at solving the technical bottleneck of the existing background caused by single-tank feeding, which leads to supply interruption and process degradation, and the inability to supply composite materials online. The core of the utility model is that the background includes at least two independently controllable feeding units, and the control unit can be configured in multiple working modes: in the alternate mode, the continuous and uninterrupted supply of single powder is achieved through automatic switching of the main and standby tanks; in the parallel mode, the composite ingredients are proportionally supplied online through multi-tank cooperation; and the two modes can be combined to achieve continuous and uninterrupted supply of composite materials. This platform architecture can also organically integrate multi-axis equal distribution, single-path continuous feeding, and multi-use of air supply for feeding tanks, and solve the fundamental contradiction between the existing technology in terms of supply continuity, flexibility of ingredient, and economic efficiency of multi-axis construction.

Description

Technical Field

[0001] This utility model relates to the technical field of powder jet grouting construction equipment, and more specifically, to a multi-mode collaborative airlock quantitative feeding powder jet grouting back-end system. Background Technology

[0002] In modern foundation treatment engineering, the back-end material supply system is a crucial link determining the efficiency, quality, and safety of jet grouting construction. However, for a long time, development in this field has focused on patchwork improvements to existing equipment, resulting in a relatively rigid overall design mindset and a lack of fundamental architectural innovation. This has directly led to a near stagnation in innovation of existing jet grouting back-end systems due to persistent and difficult-to-cure problems such as uneven material feeding, poor pile quality, easy pipe blockage, and on-site dust pollution. These systems are severely lagging behind in several key performance indicators, including the accuracy, continuity, flexibility, and economy of material supply, and are increasingly inadequate when facing large-scale, high-intensity modern construction projects.

[0003] First, there are the fundamental issues of "quantitative accuracy" and "single-channel continuity." Traditional back-end systems often employ mechanical devices such as rotary feeders, whose output is easily affected by factors such as material level and back pressure, making it difficult to meet the precise quantitative requirements of high-quality pile foundations. To address this issue, in a patent application filed on the same day titled "A Powder Jet Grouting Back-End System and Construction Method with Airlock Pulse Feeding," the applicant significantly improved feeding accuracy through a high-precision airlock dual-valve feeding scheme. However, the "filling-jetting" cycle of this scheme is essentially a high-frequency pulsed supply, and there is still room for improvement in scenarios with extremely high requirements for feeding uniformity. Therefore, in another patent application filed on the same day titled "A Powder Jet Grouting Back-End System and Construction Method with Multi-Channel Parallel Airlock Quantitative Feeding," the applicant further proposed a scheme of continuous feeding with multiple sets of dual valves. That is, within a single feeding branch, through the alternating operation of at least two sets of dual valves, a truly stable and pulse-free continuous feeding of that branch is achieved.

[0004] Even though the above solutions address the accuracy and continuity issues of single-point material feeding, a more macroscopic, system-level continuity bottleneck remains: the "downtime replenishment" problem. Existing powder spraying systems generally rely on a single material tank for supply. Once the tank is empty, the entire construction process must be interrupted to wait for the lengthy non-operational replenishment period. This interruption occurs frequently in pile foundation engineering, especially during long piles, large-diameter piles, or high-mixture piles where powder consumption is high, requiring even more frequent replenishment, significantly hindering overall construction efficiency. In the related wet-mixed spraying pile field, a dual-container relay method of "upper tank mixing, lower tank feeding" to achieve continuous slurry supply is a standard technique. However, because dry-transported powder materials are always under pressure or fluidization, the method of achieving continuous relay supply is completely different from that of liquid slurry under normal pressure, increasing the technical difficulty exponentially. It requires switching between complex pressure-bearing, air-locking, and pressure-equalizing conditions. Therefore, although the concept of continuous supply has long existed, the problem of refilling materials during downtime has not been effectively solved in the powder coating back-end field, and remains a common bottleneck restricting construction efficiency.

[0005] However, the impact of downtime for material replenishment goes far beyond wasted labor time; it more profoundly restricts the application of advanced construction techniques. In jet grouting pile construction, the optimal technique is "drilling down and jetting" (mixing during both the lowering and raising of the drill rod), but this technique places extremely high demands on the continuous material supply capacity of the back-end system. If a prolonged interruption in material replenishment occurs during the drilling phase, it can easily lead to serious accidents such as drill bit jamming or breakage due to the initial setting of the mixed soil. To avoid this significant risk, the industry is often forced to adopt the "drill-lifting and jetting" technique, which halve the number of mixing operations. This limitation of existing technology essentially deprives construction companies of the potential to use optimal techniques to improve pile quality.

[0006] Beyond the aforementioned bottlenecks, the complexity of back-end supply is further exacerbated when multi-axis drilling rigs are used to pursue higher construction efficiency. To ensure the quality of multi-axis construction, the industry commonly adopts a "one axis, one back-end" configuration. This approach is adopted partly due to established practices and partly to address the fundamental problem of uneven powder distribution and inconsistent supply caused by the dynamically changing back pressure of each branch line when diverting from a single source to multiple pipelines. However, while the "one axis, one back-end" approach guarantees quality, it is costly. To address this cost issue, in another patent application filed on the same filing date (i.e., "A Single Back-End Quantitative Material Supply System and Construction Method for Multi-Axis Powder Jet Pile"), the applicant proposed a scheme for precise quantitative material feeding from a single back-end to multiple axes. While this approach addresses the economic issues of back-end supply in multi-axis construction to some extent, it amplifies the aforementioned problem of continuity interruption due to the significantly increased powder consumption rate.

[0007] Furthermore, the industry faces a dilemma when configuring power sources for the aforementioned systems: dual-gas-source configurations are stable but costly, while the economical single-gas-source configuration carries risks such as pipe blockage and poor pile quality due to insufficient pressure recovery from the main gas source. To address this, in another patent application filed on the same application date, entitled "A Powder Jet Pile Backstage and Construction Method with Air-Locking Pulse Feeding and Gas Source Reuse," the applicant resolved the operational contradictions of a single gas source through an innovative design of "gas source reuse" within the conveying tank.

[0008] Even so, existing technologies, even advanced systems integrating all the aforementioned individual solutions, remain powerless to address a more fundamental, top-level problem: the "technological gap" and "process dilemma" in material application within the powder spraying field. In the related wet spraying field, the use of composite cementitious materials composed of various powders such as cement and fly ash is also a mature and widespread technology, offering obvious advantages. For example, it can reduce heat of hydration, improve workability, enhance the later-stage strength and durability of the pile, and effectively reduce material costs. For liquid slurries, achieving a composite ratio is very simple; a uniform composite slurry can be easily and reliably obtained through "pre-mixing." However, when attempting to transplant this seemingly simple "pre-mixing" concept to the powder spraying field, numerous difficulties arise due to the physical properties of dry powder. If construction companies want to use composite materials, they mostly have to resort to this cumbersome method of "pre-mixing" dry powder, the drawback of which is obvious: the most immediate issue is potential quality problems. Because different powders such as cement and fly ash have varying densities, particle sizes, and flowability, mechanical mixing in large silos is not only extremely energy-intensive and costly, but also makes it difficult to guarantee high uniformity at the microscopic level. More seriously, even after mixing, the mixed powder is prone to segregation during subsequent storage and transportation due to vibration and other factors. This results in the final powder mix delivered to the nozzle deviating significantly from the design values, severely impacting the stability of the pile's quality. Furthermore, this rigid process prevents construction companies from fine-tuning the mix ratio according to geological changes and requires additional space and equipment, adding unnecessary procedures.

[0009] In summary, existing technologies suffer from fundamental deficiencies in addressing the three core requirements of continuous supply, flexible material preparation, and economic efficiency in multi-axis construction. Therefore, the key technical indicator for evaluating the breakthrough potential of a new generation of back-end systems lies in how to integrate all these issues into a single system—enabling continuous supply of single materials to eliminate refueling downtime, providing online and flexible composite material preparation processes, and especially overcoming the ultimate industry challenge of continuous and uninterrupted supply of composite materials themselves, while ultimately making these capabilities economically and reliably compatible with single-axis and multi-axis construction. This is impossible to achieve within the existing technological framework. Therefore, the field urgently needs a novel, multi-mode collaborative, platform-based back-end material supply system architecture. This architecture should be based on a multi-tank design to provide a fundamental breakthrough in material supply strategies; and it should organically integrate various advanced functional modules such as multi-axis equal-volume distribution, single-path continuous feeding, and air source reuse, thereby comprehensively solving all the aforementioned technical bottlenecks with an integrated solution and achieving truly economical, efficient, continuous, and intelligent powder jet grouting construction operations. Utility Model Content

[0010] The technical problem to be solved by this utility model is to further address the more fundamental bottlenecks and contradictions that still exist in the top-level architecture design of the current back-end system, based on the progress made by existing technologies through single-point technological innovations in quantitative accuracy (such as air-lock dual-valve feeding), single-path continuity (such as alternating feeding of multiple sets of valves), multi-axis economy (such as single back-end multi-axis distribution) and single air source reliability (such as air source reuse). Specifically: First, it addresses the system-level continuity interruption caused by the shutdown and refueling of a single main material tank, resulting in low construction efficiency, process degradation, and serious compromises in pile quality. Second, it resolves the technological gap in composite material applications within the powder coating field, providing an online, flexible composite batching solution that can replace the "pre-mixing" process, which suffers from quality issues such as uneven mixing and component segregation. Finally, this invention aims to combine the above two points to overcome the ultimate industry challenge of continuous and uninterrupted supply of composite materials, and to provide a "multi-mode collaborative" platform architecture that organically integrates all advanced technology modules, thereby breaking the inherent contradiction between cost, efficiency, and continuity in multi-axis construction.

[0011] To address the aforementioned technical problems, this invention provides a multi-mode collaborative airlock quantitative feeding system for powder jet grouting and its associated construction method. The main objective of this invention is to propose a novel platform-based backend architecture with a multi-tank design, coupled with a multi-mode collaborative intelligent control strategy. This architecture, by controlling at least two feeding units, can flexibly execute an alternating working mode to achieve continuous and uninterrupted supply of a single powder material, or a parallel working mode to achieve online composite batching. Through a combination of these two modes, it achieves continuous and uninterrupted supply of the composite material itself. Simultaneously, the platform-based architecture provided by this invention organically integrates various advanced functional modules such as multi-axis equal-volume distribution, single-path pulse-free continuous feeding, and air source reuse. This aims to comprehensively resolve the fundamental contradictions in continuity, flexibility, and economy inherent in existing technologies through an integrated solution, thereby providing a highly integrated backend technology solution for powder jet grouting projects that features continuous material supply, flexible batching, intelligent control, and high integration.

[0012] To achieve the above objectives, this utility model provides a multi-mode collaborative airlock quantitative feeding powder jetting pile back-end, including an air supply unit, at least two feeding units, a quantitative feeding unit, a pneumatic conveying unit, and a control unit for coordinating the operation of each unit. The quantitative feeding unit includes quantitative feeding sub-units corresponding to the feeding units, and each quantitative feeding sub-unit includes at least one quantitative module. The pneumatic conveying unit includes at least a branch pipe, a diversion pipe, a powder conveying pipe, and a mixing channel. Each feeding unit has at least one outlet, and each outlet is connected to a branch pipe, which in turn is connected to at least one diversion pipe. The outlet of each diversion pipe is connected to a quantitative module. The outlets of all quantitative modules connected to the same branch pipe converge and connect to one powder conveying pipe. Multiple powder conveying pipes from different feeding units converge and connect to a mixing channel. The control unit is used to control at least two feeding units to feed material to the quantitative feeding unit in an alternating or parallel working mode.

[0013] Furthermore, each feeding unit has at least two discharge ports; each discharge port is connected to at least one branch pipe via a branch pipe, and the outlet of each branch pipe is connected to a quantitative module; the discharge ends of all quantitative modules connected to the same branch pipe converge and connect to the powder conveying pipe; multiple powder conveying pipes from different feeding units and corresponding to the same mixing channel converge and connect to the corresponding mixing channel; the outlet of each mixing channel is connected to a powder-gas conveying pipe, and the powder-gas conveying pipes connected to at least two mixing channels are used to feed materials to at least two drill rods of a piling machine respectively.

[0014] Furthermore, each of the metering modules consists of a set of filling valves, metering chambers, and injection valves arranged sequentially along the powder flow direction; the inlet of the filling valve is connected to the outlet of the branch pipe; the outlet of the injection valve is connected to the inlet of the mixing channel; the control unit is configured to perform an intermittent basic metering cycle on the metering module.

[0015] Furthermore, it includes at least two parallel feeding groups; at least one of the feeding groups is a continuous feeding group, which includes at least two feeding units for filling the same powder and is configured to work alternately to form a continuous and uninterrupted supply of the powder; the remaining feeding groups are conventional feeding groups, which include at least one feeding unit; and the control unit is configured to drive all feeding units to work in parallel to form and supply a composite powder flow.

[0016] Furthermore, the quantitative module includes at least two sets of valve groups arranged in parallel, each consisting of a filling valve, a metering chamber, and an injection valve; and the control unit is configured to drive the at least two sets of valve groups to perform alternating cyclic operation, wherein when one set of valve groups performs the injection step, the other set or more sets of valve groups simultaneously perform the filling step, so as to achieve continuous and uninterrupted feeding of the quantitative module outlet.

[0017] Furthermore, there is one air supply unit, which provides a conveying air source to the pneumatic conveying unit and a pressurized air source to the feeding unit. The pneumatic conveying unit includes an air supply pipe corresponding to each feeding unit. The air inlet of the air supply pipe is connected to the air supply unit. The air outlet of the air supply pipe is connected to the mixing channel. Each feeding unit is connected to its corresponding air supply pipe through a corresponding feeding tank air inlet pipe. The feeding tank air inlet pipe is configured to form a bidirectional air passage, used to convey the compressed air from the air supply unit to the feeding unit connected to it as its pressurized air source; or to convey the high-pressure gas in the feeding unit connected to it in the reverse direction to the air supply pipe connected to it as a conveying air source.

[0018] Furthermore, the first air supply unit is used to provide pressurized air to the feeding unit; the second air supply unit is used to provide conveying air to the pneumatic conveying unit; the pneumatic conveying unit includes at least one air conveying pipe; the air inlet end of the air conveying pipe is connected to one of the air supply units, and the air supply unit provides conveying air to the air conveying pipe; the air outlet end of the air conveying pipe is connected to the mixing channel.

[0019] Furthermore, the angle formed by the intersection of the central axis of the gas supply pipe and the central axis of the mixing channel is less than 60°; when there are multiple gas supply pipes, all gas supply pipes are distributed at intervals along the circumference or axial direction of the mixing channel.

[0020] Furthermore, each feeding unit includes a feeding tank body, a support frame, a connecting flange, and a feeding tank exhaust pipe; the feeding tank body is mounted on the support frame, the inlet of the connecting flange is connected to the outlet of the feeding tank body, and a guide pipe is connected to the outlet of the connecting flange; the outlet of the guide pipe is connected to the inlet of the branch pipe; a vibrator is also provided at the bottom of the feeding tank body; the feeding tank exhaust pipe is connected to the feeding tank body.

[0021] Furthermore, the control unit includes a sensor group, a valve group, and a central control cabinet. The sensor group includes a weighing sensor for monitoring the weight of the powder curing agent inside the conveying tank and a conveying tank pressure gauge for monitoring the pressure inside the tank. The weight of the conveying tank body is supported by at least three weighing sensors, each of which is fixed to the support frame, and the conveying tank body is vertically pressed onto the weighing sensors. The conveying tank pressure gauge is installed on the conveying tank body. The valve group includes a feed valve, a conveying tank pressurization valve, a conveying tank exhaust valve, and a main air circuit switch valve. The feed valve is installed on the conveying tank body and is used to replenish the powder curing agent. The conveying tank pressurization valve is installed on the conveying tank air inlet pipe, the conveying tank exhaust valve is installed on the conveying tank exhaust pipe, and the main air circuit switch valve is installed on the output air circuit of the air supply unit. The output air circuit of the air supply unit is also equipped with a main air circuit pressure gauge. The central control cabinet is installed on the support frame and is electrically connected to the vibrator, the valve group, the sensor group, and the quantitative feeding unit.

[0022] Compared with existing technologies, this utility model provides a platform-based back-end material supply system and construction method with "multi-mode collaboration". The architecture is based on the "multi-tank" design and the "airlock dual-valve" quantitative feeding structure. It aims to solve many bottlenecks of existing technologies in an integrated manner and achieve one or more of the following fundamental beneficial effects: This invention ensures continuous material supply from the back-end system, improving construction techniques and pile quality. Based on a multi-tank design, it fundamentally solves the bottleneck of system-level construction interruption caused by the need to replenish materials when a single tank stops due to downtime, through automatic and seamless switching between the main and backup tanks. This not only directly improves construction efficiency, but more importantly, it creates a safe environment for construction teams to use the "down-drilling and powder spraying" process, which involves the most mixing cycles and produces the highest pile quality, thereby greatly releasing the potential for improving pile quality.

[0023] This invention enables online compound batching, enhancing the flexibility of material application. Through a multi-tank parallel collaborative working mode, it provides, for the first time in the powder coating field, a reliable and flexible solution for online, on-demand, and proportional supply of various composite curing agents. It completely eliminates the major defects of traditional "pre-mixing" processes, such as uneven mixing and component segregation, giving construction parties the ability to optimize material ratios in real time according to geological conditions, greatly improving the adaptability of projects and the stability of pile quality.

[0024] This invention achieves a continuous and uninterrupted supply of composite materials. By modularizing the feeding unit into "continuous supply groups" and "conventional supply groups," it overcomes the industry challenge of continuous and uninterrupted supply of composite materials. This architecture allows the backend to flexibly configure various optimal supply solutions, much like "building blocks." Whether it's a simple continuous composite supply of a single main material or a complex continuous composite supply of multiple main materials, this invention ensures a stable and uninterrupted flow of the final output composite material, meeting the high-strength and high-standard engineering requirements.

[0025] This invention constructs a multi-mode collaborative platform to enhance system flexibility and economy. It provides a platform architecture that organically integrates multiple advanced functional modules. Based on a multi-tank model, the platform ensures system-level operational continuity and composite material supply capacity. On this solid foundation, modules such as multi-axis equal-volume distribution, multi-valve continuous feeding, and compatible gas source reuse can be added as needed. This platform-based and modular approach allows a single backend to flexibly handle various construction scenarios, from single-axis to multi-axis, overcoming the inherent contradiction in existing technologies that prioritize single functionality and fail to balance reliability and economy. Attached Figure Description

[0026] Figure 1 This is a front view of the overall structure of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the gas supply unit structure according to Embodiment 1 of this utility model; Figure 3 This is a rear view of the overall structure of Embodiment 1 of this utility model; Figure 4 This is a pneumatic conveying circuit diagram of Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the material storage unit according to Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the quantitative feeding unit and pneumatic conveying unit of Embodiment 1 of this utility model; Figure 7 This is a circuit diagram of the pressurization circuit of the conveying tank in Embodiment 1 of this utility model; Figure 8The above view and front view are of the overall structure of the feeding unit according to Embodiment 1 of this utility model; Figure 9 This is a schematic diagram illustrating the collaborative operation between Embodiment 1 of this utility model and the front-end. Figure 10 This is a schematic diagram illustrating the usage method of Embodiment 1 of this utility model; Figure 11 This is a schematic diagram and top view of the quantitative feeding unit and conveying tank structure of Embodiment 3 of this utility model; Figure 12 This is a schematic diagram and top view of the quantitative feeding unit and conveying tank structure of Embodiment 4 of this utility model; Figure 13 This is a schematic diagram of the quantitative feeding unit structure in Embodiment 5 of this utility model; Figure 14 This is a schematic diagram illustrating the usage method of Embodiment Six of this utility model; Figure 15 This is a schematic diagram of the gas pipeline structure in Embodiment 7 of this utility model; Figure 16 This is a schematic diagram and top view of the feeding unit and quantitative feeding unit of Embodiment 8 of this utility model; Figure 17 This is a schematic diagram and left view of the feeding unit and quantitative feeding unit of Embodiment 9 of this utility model; Figure 18 This is a schematic diagram of the drill rod and drill bit of the front-end piling machine in Embodiment 9 of this utility model; Figure 19 This is a schematic diagram and left view of the feeding unit and quantitative feeding unit of Embodiment 10 of this utility model; Figure 20 This is a schematic diagram of the feeding unit and quantitative feeding unit of Embodiment Eleven of this utility model; Figure 21 This is a schematic diagram and left view of the feeding unit and quantitative feeding unit of Embodiment Twelve of this utility model; Figure 22 This is a schematic diagram of the drill rod and drill bit of the front-end piling machine in Embodiment Twelve of this utility model. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0028] As shown in Figures 1-10, this utility model provides a multi-mode collaborative airlock quantitative feeding powder spraying pile back-end, including an air supply unit 1, two feeding units 2, a quantitative feeding unit 6, a storage unit 5 connected to the inlet of each feeding unit 2, a pneumatic conveying unit 3, and a control unit 4 for controlling the coordinated operation of each unit. The quantitative feeding unit 6 includes quantitative feeding sub-units corresponding one-to-one with the feeding units 2, and each quantitative feeding sub-unit includes a quantitative module 64. The pneumatic conveying unit 3 includes a branch pipe 302, a diversion pipe 308, an air conveying pipe 303, a mixing channel 305, a powder-air conveying pipe 31, and a powder conveying pipe 309. Each feeding unit 2 has a discharge port. The discharge port is connected to a branch pipe 302, which in turn branches to a branch pipe 308. Each branch pipe 308 has an outlet connected to a metering module 64. The discharge ends of all metering modules 64 connected to the same branch pipe 302 converge and connect to a powder conveying pipe 309. Two powder conveying pipes 309 from different feeding units 2 converge and connect to a mixing channel 305. The control unit 4 controls the two feeding units 2 to feed material to the metering unit 6 in an alternating operating mode. The storage unit 5 is used to replenish material into the feeding unit 2.

[0029] Specifically, as shown in Figure 8, the control unit 4 includes a sensor group, a valve group, and a central control cabinet 42. The sensor group includes three weighing sensors 401 for monitoring the weight of the powder curing agent in the conveying tank assembly 210 of each conveying subsystem, a conveying tank pressure gauge 403 for monitoring the pressure inside the conveying tank body 210, pressure gauges for each air storage tank, and a main air pipe pressure gauge for monitoring the conveying pipeline. The valve group includes a conveying tank pressurization valve 413, a conveying tank exhaust valve 414, a feed valve, a storage tank discharge valve, and a main air circuit switch valve for regulating the pressure of the conveying tank body 210. The central control cabinet 42 is electrically connected to the valve group 41, the sensor group 40, and the filling valve 61 and the injection valve 63 of the quantitative feeding unit 6.

[0030] Specifically, as shown in Figure 6, each metering module 64 consists of a set of filling valve 61, metering chamber 62, and injection valve 63 arranged sequentially along the powder flow direction; the inlet of filling valve 61 is connected to the outlet of branch pipe 302; the outlet of injection valve 63 is connected to the inlet of mixing channel 305; the control unit 4 is configured to perform an intermittent basic metering cycle for metering unit 6, which includes: 1. Filling step: close injection valve 63 and open filling valve 61 to fill metering chamber 62; 2. Injection step: after filling is completed, close filling valve 61 and open injection valve 63 to spray powder out of metering chamber 62.

[0031] Specifically, as shown in Figures 1, 4, and 7, there are two air supply units 1; the first air supply unit 1.a is used to provide pressurized air to the feeding unit 2; the second air supply unit 1.b is used to provide conveying air to the pneumatic conveying unit 3; the pneumatic conveying unit 3 includes one or more air conveying pipes 303; the air inlet end of the air conveying pipe 303 is connected to one of the air supply units 1, and the air supply unit 1 provides conveying air to the air conveying pipe 303; the air outlet end of the air conveying pipe 303 is connected to the mixing channel 305.

[0032] Specifically, such as Figure 6 As shown, the feature is that the angle formed by the intersection of the central axis of the gas delivery pipe 303 and the central axis of the mixing channel 305 is 30°; when there are two gas delivery pipes 303, the gas delivery pipes 303 are distributed circumferentially along the mixing channel 305.

[0033] Specifically, as shown in Figure 8, according to the above-mentioned multi-mode collaborative airlock quantitative feeding powder spraying pile back-end, each feeding unit 2 includes a conveying tank body 210, a support frame 212, a connecting flange 211, and a conveying tank exhaust pipe 215; the conveying tank body 210 is set on the support frame 212, the inlet of the connecting flange 211 is connected to the outlet of the conveying tank body 210, and the outlet of the connecting flange 211 is connected to a guide pipe 301; the outlet of the guide pipe 301 is connected to the inlet of the branch pipe 302; a vibrator 213 is also provided at the bottom of the conveying tank body 210; the conveying tank exhaust pipe 215 is connected to the conveying tank body 210; the control unit 4 includes a sensor group, a valve group, and a central control cabinet 42; the sensor group includes a weighing sensor 401 for monitoring the weight of the powder curing agent in the conveying tank body 210 and a conveying tank pressure gauge 403 for monitoring the pressure inside the tank, the weight of the conveying tank body 210 is supported by at least three weighing sensors 401, each weighing sensor The sensor 401 is fixed on the support frame 212, and the conveying tank body 210 is vertically pressed on the weighing sensor 401. The conveying tank pressure gauge 403 is installed on the conveying tank body 210. The valve group includes a feed valve 411, a conveying tank pressurization valve 413, a conveying tank exhaust valve 414, and a main air circuit switch valve 418. The feed valve 411 is installed on the conveying tank body 210 and is used for replenishing the powder curing agent. The conveying tank pressurization valve 413 is installed on the conveying tank air inlet pipe 214. The conveying tank exhaust valve 414 is installed on the conveying tank exhaust pipe 215. The main air circuit switch valve 418 is installed on the output air circuit of the air supply unit 1, and the output air circuit of the air supply unit 1 is also equipped with a main air circuit pressure gauge 402. The central control cabinet 42 is installed on the support frame 212. The central control cabinet 42 is electrically connected to the vibrator 213, the valve group, the sensor group, and the quantitative feeding unit 6.

[0034] Specifically, as shown in Figure 8, the central control cabinet 42 of the control unit 4 is further configured to dynamically control the opening and closing of the pressurization valve 413 and the exhaust valve 414 of the conveying tank of the current conveying subsystem based on the pressure data fed back by the pressure gauge 403 of the conveying tank corresponding to the current working conveying subsystem, so as to accurately maintain the pressure in the conveying tank body 210 of the current working conveying subsystem within the preset working pressure range. This stable pressure maintenance of the conveying tank body 210 of the current working conveying subsystem aims to ensure that when the filling valve 61 of the quantitative feeding unit 6 is opened by the selected working conveying subsystem to fill the quantitative chamber 62 according to the preset program, the quantitative chamber 62 can obtain a consistent amount of powder curing agent and a basically the same initial internal pressure each time. This ensures that in each spraying cycle of the subsequent spraying valve 63 of the quantitative feeding unit 6 opened according to the preset program, the amount of powder curing agent sprayed from the quantitative chamber 62 is highly consistent, thereby helping to achieve overall quantitative feeding.

[0035] Specifically, as shown in Figure 8, the central control cabinet 42 of the control unit 4 is further configured to, during or before filling the metering chamber 62 of the metering unit 6 through the filling valve 61 of the metering unit 6, activate the vibrator 213 configured on the outer wall of the conveying tank body 210 of the conveying subsystem currently supplying the material, according to preset conditions or real-time monitoring of the flow state of the powder curing agent, to assist the powder curing agent in overcoming potential arching or poor flow that may occur in the conveying tank body 210 or its outlet, and ensure that it flows smoothly and quickly into the metering chamber 62.

[0036] Specifically, as shown in Figure 1, the storage unit 5 includes two storage tanks 50 and a feeding mechanism for conveying the powder curing agent from the storage tanks 50 to the conveying tank assemblies 21 of the two conveying subsystems. The feeding mechanism includes a feeding auger 51 corresponding to each storage tank 50 and an auger motor 52 driving it. Each storage tank 50 is provided with a storage tank discharge valve 416 at its bottom. The central control cabinet 42 of the control unit 4 automatically and synchronously controls the start and stop of the auger motor 52 of the corresponding feeding auger 51 and the opening and closing of the storage tank discharge valve 416 of the corresponding storage tank 50 according to the powder weight signal fed back by the weighing sensor 401 set on the corresponding conveying tank assembly 21, so as to realize the automatic replenishment of the conveying tank assembly 21 on demand.

[0037] In this embodiment, combined with Figure 9 , 10 The paper also discloses a construction method for a powder jet grouting system with multi-mode collaborative airlock quantitative feeding, which is used to achieve a continuous and uninterrupted supply of powder material, including the following standard steps: Operating parameters setting: Set background operating parameters on the central control cabinet 42, including at least: the preset working pressure of the material conveying tank 210, the pre-pressurization trigger weight threshold of the spare tank, and the system switching trigger weight threshold.

[0038] Initial feeding: The same powder is loaded into the first feeding tank 210.a and the second feeding tank 210.b.

[0039] System startup and main tank pre-pressurization: Select the first conveying tank 210.a as the initial main tank and pre-pressurize it to the working pressure, and use the second conveying tank 210.b as the backup tank.

[0040] Perform feeding operation: After receiving the instruction from the front-end piling machine 7, the control unit 4 opens the feeding passage of the main tank 210.a and drives the downstream quantitative feeding unit 6 to start quantitative feeding according to the preset opening and closing cycle.

[0041] Automatic monitoring and switching: During operation, the remaining powder level in the main tank 210.a is continuously monitored by the weighing sensor 401, and when it falls below the switching trigger threshold, it seamlessly switches to the pre-pressurized backup tank 210.b to take over the feeding and become the new main tank.

[0042] Cyclic operation: Automatically replenish the emptied main tank and switch it to a new standby state, while repeating steps S4 to S5 to achieve continuous and uninterrupted supply of single powder. Example 2

[0043] This embodiment aims to detail the specific construction method of this utility model in the alternating working mode, so as to achieve continuous and uninterrupted supply of a single powder. The hardware structure of this embodiment can be referred to Embodiment 1, taking a system containing two feeding units 2 as an example. The core difference lies in the control logic executed by the control unit 4. The method specifically includes the following steps: Operating parameters setting: Set background operating parameters on the central control cabinet 42, including at least: the preset working pressure of the material conveying tank 210, the first weight threshold for triggering pre-pressurization of the standby tank, and the second weight threshold for triggering system switching.

[0044] Initial feeding: The same powder curing agent is loaded into the first feeding tank 210.a and the second feeding tank 210.b to the preset weight.

[0045] System startup and main tank pre-pressurization: The first conveying tank 210.a is selected as the initial main tank, and the second conveying tank 210.b is selected as the backup tank.

[0046] The main tank 210.a is pre-pressurized to the preset working pressure by the corresponding conveying tank pressurization valve 413.a, and the background system enters standby mode.

[0047] Execute feeding operation: After receiving the start operation command issued by the front pile driver 7, the control unit 4 opens the feeding valve 412.a corresponding to the main tank 210.a and drives the downstream quantitative feeding unit 6 to start quantitative feeding according to the preset opening and closing cycle.

[0048] Automatic monitoring, switching, and replenishment: During the feeding operation, the control unit 4 continuously monitors the real-time remaining amount of powder inside the main tank 210.a through the weighing sensor 401 connected to it.

[0049] When the remaining powder is below the first weight threshold, the control unit 4 automatically opens the feed tank pressure valve 413.b of the spare tank 210.b to pre-pressurize it and put it into the ready-to-switch state.

[0050] When the remaining powder in the main tank 210.a continues to decrease to the second weight threshold, the control unit 4 performs a seamless switch: immediately closes the discharge valve 412.a of the main tank, and at the same time opens the discharge valve 412.b of the pre-pressurized standby tank, so that the standby tank 210.b takes over the feeding and becomes the new main tank.

[0051] After the switch is completed, the control unit 4 automatically starts the replenishment program for the emptied original main tank 210.a. After the replenishment is completed, the tank automatically becomes the new standby tank.

[0052] Cyclic operation: The system repeatedly executes steps S4 and S5, and through the alternating cyclic operation of the two material tanks, it achieves continuous and uninterrupted supply of single powder material until the operation completion instruction of the piling machine 7 is received. Example 3

[0053] As shown in Figure 11, this embodiment aims to illustrate a preferred implementation of the present invention, with the purpose of solving the defects of pulsed and discontinuous feeding caused by the "filling-jetting" cycle of a single airlock quantitative feeding unit, so as to achieve truly stable and continuous feeding for a single feeding path. The overall hardware structure of this embodiment can refer to Embodiment 1, with the core difference being the specific configuration inside the quantitative feeding unit 6.

[0054] In this embodiment, a metering module 64, such as a first metering module serving the first drill pipe, has an internal structure comprising two sets of valve assemblies arranged in parallel, each consisting of a filling valve 61, a metering chamber 62, and an injection valve 63. The inlets of these two sets of valve assemblies share the same upstream feeding unit, such as 210.a, and their outlets converge into a powder conveying pipe 419, which then connects to a mixing channel 305.

[0055] To achieve continuous feeding, the control unit 4 is configured to drive two sets of valves within the metering module 64 to perform alternating and coordinated feeding. The operating logic is as follows: when one set of valves, such as the first set's injection valve 63, opens to perform the injection step, the other set's injection valve 63 is closed, while its filling valve 61 opens to synchronously perform the filling step. When the first set of valves completes injection and transitions to filling, the second set of valves, which has already completed filling, immediately and seamlessly takes over and begins injection. This cycle repeats continuously.

[0056] In this way, the total outlet of the quantitative module 64 can form a continuous and uninterrupted flow of powder, thereby eliminating the intermittent supply caused by the sequential operation of a single valve group, greatly improving the stability and uniformity of feeding, and better meeting the needs of demanding working conditions such as high flow rate and high dosage.

[0057] The core of the construction method in this embodiment lies in the fact that, during the feeding operation, for example, in step S4 of Embodiment 1 or Embodiment 2, the control unit 4 performs alternating cyclic control on the two sets of valve groups within the single quantitative module 64. Specifically, when one valve group performs the injection step, the other valve group is simultaneously controlled to perform the filling step, and the working states of the two sets of valve groups are periodically switched. The remaining parameter settings, feeding, system start-up and shutdown steps are the same as those described in Embodiment 1 or Embodiment 2, and will not be repeated here. Example 4

[0058] As shown in Figure 12, this embodiment aims to illustrate a more preferred implementation of the present invention, with the purpose of providing a smoother and more seamless continuous supply than the dual-unit alternating scheme described in Embodiment 3. The core difference lies in the fact that a single quantitative module 64 structurally includes three parallel valve groups and employs a "relay-style" cyclical working strategy.

[0059] Specifically, a metering module 64, such as a first metering module 64.1 serving the first drill pipe, has an internal structure comprising three sets of valve assemblies arranged in parallel, each consisting of a filling valve 61, a metering chamber 62, and an injection valve 63. The inlets of these three sets of valve assemblies share powder from the same upstream feeding unit, and their outlets converge into a single main outlet.

[0060] To achieve seamless and continuous supply, control unit 4 is configured to implement a "relay" cyclical operating strategy for these three valve groups. This strategy is characterized by maintaining a state where, at any given time, one valve group is spraying, one is filling, and one is fully loaded and ready to go, ensuring that powder is always being sprayed from the total outlet of the metering module. Its typical cyclic flow is as follows: Initial stage: The first valve group performs injection, while the second valve group performs filling. The third valve group has completed filling and is in a full-material standby state.

[0061] First switchover: After the first valve group completes the injection, the third valve group, which is in a full-material standby state, immediately and seamlessly takes over and begins to perform injection; at the same time, the first valve group enters the filling step, while the second valve group completes the filling and enters the full-material standby state.

[0062] Second switching: After the third valve group completes the injection, the second valve group, which is in a full-material standby state, immediately takes over the injection; at the same time, the third valve group enters the filling step, and the first valve group completes the filling and enters the full-material standby state.

[0063] The third switch: After the second valve group finishes spraying, the first valve group, which is in a full-load standby state, takes over the spraying again, and the system returns to the initial stage, and so on.

[0064] Through the three-stage cycle described above, a continuous and uninterrupted supply of powder is achieved from the main discharge port. Compared to the alternating dual-valve group scheme, this three-valve group "relay" scheme has the advantage that, since one valve group is always in a "full and ready" state, the switching process for injection tasks can be achieved with zero delay, resulting in a more stable and uniform final output flow. In addition, this mode also allows more time for the filling step of each valve group, which is particularly advantageous for powders with poor flowability or those that require a longer time to complete reliable filling.

[0065] The core of the construction method in this embodiment lies in the fact that, during the feeding operation, the control unit 4 executes the aforementioned "relay" cyclic control logic on the three valve groups within a single quantitative module 64 to ensure that there is always one valve group spraying, one group filling, and one group on standby. The remaining steps are the same as in the aforementioned embodiment. Example 5

[0066] like Figure 13 As shown, this embodiment aims to illustrate a specific configuration of the present invention, with the purpose of providing a more simplified and economical solution specifically designed for parallel conveying (i.e., online supply of composite materials). Its overall hardware structure can be referred to in Embodiment 1, with the core difference being the connection method between the multiple feeding units and the quantitative feeding unit.

[0067] In this embodiment, the outlets of at least two independent feeding units (e.g., the first feeding unit 2.a and the second feeding unit 2.b) converge at the inlet of a single and shared quantitative feeding unit 6 through their respective guide pipes (the first guide pipe 301.a and the second guide pipe 301.b) and the diversion pipe 308.

[0068] On each branch pipe 308, that is, upstream of the common metering unit 6, there is an independent discharge valve (first discharge valve 412.a and second discharge valve 412.b). The common metering unit 6 itself is still composed of a filling valve 61, a metering chamber 62 and an injection valve 63.

[0069] This embodiment is specifically designed to achieve continuous material supply through alternating supply, providing a highly cost-effective alternative, especially suitable for projects with high requirements for system cost and space. The detailed usage method of the construction backend described in this embodiment is the same as or substantially the same as the implementation method described in Embodiment 1, and will not be repeated here. Example 6

[0070] This embodiment aims to illustrate a more economical configuration of the present invention. Compared with Embodiment 1, which uses dual air compressors, the core difference of this embodiment lies in the use of a single air supply unit 1 and the innovative "air source reuse" design, which achieves the same high level of delivery reliability at a lower cost.

[0071] This embodiment (such as) Figure 14 The structure is generally similar to that of the embodiment shown, with the key difference being that there is only one air supply unit 1, which is used to provide a conveying air source to the pneumatic conveying unit 3 and a pressurizing air source to the feeding unit 2. The pneumatic conveying unit 3 includes an air supply pipe 303 corresponding to each feeding unit 2. The air inlet end of the air supply pipe 303 is connected to the air supply unit 1. The air outlet end of the air supply pipe 303 is connected to the mixing channel 305. Each feeding unit 2 is connected to its corresponding air supply pipe 303 through a corresponding feeding tank air inlet pipe 214. The feeding tank air inlet pipe 214 is configured to form a bidirectional air passage, used to convey the compressed air of the air supply unit 1 to the feeding unit 2 connected to it as its pressurizing air source; or to convey the high-pressure gas in the feeding unit 2 connected to it in reverse to the air supply pipe 303 connected to it as a conveying air source.

[0072] The core of the construction method in this embodiment lies in adopting a phased and coordinated gas supply strategy, which is executed by the control unit 4 and includes the following two alternating phases: Main air path conveying stage: Control unit 4 opens the main air path, and the air supply unit 1 provides pulsed, high-flow main conveying airflow through the air delivery pipe 303 for high-speed conveying of powder ejected from the quantitative feeding unit 6.

[0073] Auxiliary gas path conveying stage: During the intermittent period of main gas path conveying (i.e., during the period when the main conveying airflow stops), the control unit 4 performs a linkage operation: First, the main gas path is closed so that the gas storage tank 12 of the gas supply unit 1 can quickly restore the pressure; then, through the aforementioned bidirectional gas path channel, the high-pressure gas in the conveying tank body 210 is introduced into the conveying pipeline as an auxiliary gas source to provide a low-flow auxiliary airflow to maintain the suspension state of the powder in the pipeline and effectively prevent sedimentation and pipe blockage.

[0074] The advantages of this embodiment are: Through the ingenious design of "air source reuse", the vicious cycle of "pipe blockage-impact" caused by intermittent air supply in traditional single air source pulse delivery is perfectly solved by using only a single air compressor.

[0075] With the economic cost of a single gas source, it achieves high reliability and stability comparable to a dual gas source system, providing an optimal solution that combines economy and high performance.

[0076] The detailed usage method of the construction backend described in this embodiment is the same as or substantially the same as the implementation method described in Embodiment 1 or 2, and will not be repeated here. Example 7

[0077] Example 7 (e.g.) Figure 15 The structure is generally similar to that of the embodiment shown, with the key difference being the number and arrangement of the gas supply pipes 303.

[0078] This embodiment aims to illustrate various preferred configurations of the pneumatic conveying unit 3 of this utility model, the core of which lies in the variations in the number and spatial layout of the air delivery pipes 303 and the mixing channel 305. This embodiment includes at least the following three air path structures: Single-pipe gas supply structure. For example... Figure 15 As shown in .a, this is the most basic economical configuration. The pneumatic conveying unit 3 consists of only one main air pipe 303, whose outlet is connected to the mixing channel 305, providing conveying power for the powder ejected from the metering unit 6. The advantage of this structure is that it has the simplest hardware configuration and the lowest cost.

[0079] Dual gas supply pipe structure. For example... Figure 15 As shown in Figure 303.b, to achieve stronger power and better mixing effect, a dual air supply pipe configuration (first air supply pipe 303.a and second air supply pipe 303.b) can be adopted. The two air supply pipes are distributed at intervals along the axial direction of the mixing channel 305. The two symmetrical airflows converge in the mixing chamber, which can form a more stable and uniform flow field, which helps the initial dispersion of powder and is suitable for working conditions that require higher conveying power.

[0080] Three-channel gas supply structure. For example... Figure 15As shown in Figure .c, a configuration of three gas delivery pipes can be used to achieve optimal mixing. The three gas delivery pipes are symmetrically distributed circumferentially along the mixing channel 305. This layout allows high-speed airflow to be injected into the center of the mixing chamber from multiple angles, creating a strong turbulence zone. This ensures that the ejected powder is instantly and thoroughly dispersed and uniformly coated, achieving the most efficient gas-solid mixing. This scheme is particularly suitable for large-volume, long-distance conveying or for powders with poor flowability.

[0081] The detailed usage method of the construction backend described in this embodiment is the same as or substantially the same as the implementation method described in Embodiment 1 or 2, and will not be repeated here. Example 8

[0082] This embodiment aims to illustrate the superior operating mode of the present invention with a three-feeding unit (three tanks) configuration. Its structure is shown in Figure 16, mainly comprising three independent feeding units (first feeding unit 2.a, second feeding unit 2.b, and third feeding unit 2.c). The outlet of each feeding unit is connected to an independent quantitative feeding subunit (first quantitative feeding subunit 6.a, second quantitative feeding subunit 6.b, and third quantitative feeding subunit 6.c). The outlets of these three quantitative feeding subunits converge and connect to a common mixing channel 305.

[0083] Based on this structure, this embodiment can achieve at least the following two construction methods: Method 1: Parallel Three-Component Composite Supply. This method is used for online proportioning and supplying of a composite curing agent composed of three different powders. Three different powders (e.g., powder one is cement, powder two is fly ash, and powder three is slag powder) are respectively loaded into three feeding units (first feeding unit 2.a, second feeding unit 2.b, and third feeding unit 2.c). Control unit 4 is configured in parallel drive mode. Upon receiving the work instruction, the three quantitative feeding subunits (first quantitative feeding subunit 6.a, second quantitative feeding subunit 6.b, and third quantitative feeding subunit 6.c) start working simultaneously. Control unit 4 independently adjusts the feeding start-stop cycle and frequency of each quantitative feeding subunit according to the preset mixing ratio of the three powders, thereby precisely controlling the output rate of each powder, and thus forming a stable and precisely proportioned three-component composite material flow at the mixing channel 305. This method offers maximum formulation flexibility, allowing contractors to formulate and use specialty or high-performance curing agents consisting of three different components online in real time, based on complex engineering requirements.

[0084] Method 2: Continuous and Uninterrupted Supply of Composite Materials. This method is used to achieve a completely uninterrupted operation when supplying a composite curing agent composed of two powders. Two of the powders are designated as the "main material" and the "auxiliary material." For example, the first powder (main material, such as cement) is simultaneously loaded into two feeding units (first feeding unit 2.a, second feeding unit 2.b), and the second powder (auxiliary material, such as fly ash) is loaded into a third feeding unit (third feeding unit 2.c). The system sets one main material tank (e.g., first feeding unit 2.a) to "working state" and the other main material tank (second feeding unit 2.b) to "standby state."

[0085] Control unit 4 is configured in a composite working mode of "alternating main materials + parallel auxiliary materials": Initial feeding: Control unit 4 first drives the main material tank (first feeding unit 2.a) and auxiliary material tank (third feeding unit 2.c) in "working state" to feed the two-component composite material in parallel.

[0086] Automatic switching: During operation, the remaining powder level in the main material tank (first feeding unit 2.a) in the "working state" is continuously monitored. When it falls below the preset switching threshold, the control unit 4 performs a seamless switching of the main material tank without interrupting the feeding of the auxiliary material tank (third feeding unit 2.a 2.c) - that is, automatically switching the feeding task from the main material tank (first feeding unit 2.a) to the main material tank (second feeding unit 2.a 2.b) in the "standby state".

[0087] Cyclic operation: After switching, the new main material tank (second feeding unit 2.b) continues to work in conjunction with the auxiliary material tank (third feeding unit 2.c). At the same time, the system automatically replenishes the emptied original main material tank (first feeding unit 2.a), making it a new "standby tank", and this cycle repeats continuously. Example 9

[0088] This embodiment aims to illustrate the specific structure and usage method of the present invention in a high-performance, highly flexible dual-tank dual-axis configuration. The structure of this embodiment is shown in Figure 17. Its backend includes two independent feeding units, namely the first feeding unit 2.a and the second feeding unit 2.b. The downstream quantitative feeding unit 6 is configured to simultaneously feed material to two independent drill rods (i.e., the dual axes). The backend quantitative feeding unit 6 includes a first quantitative feeding subunit 6.a and a second quantitative feeding subunit 6.b, each corresponding one-to-one with the two feeding units (the first feeding unit 2.a and the second feeding unit 2.b). Each subunit (e.g., the subunit serving the first feeding unit 2.a) includes two quantitative modules: a first quantitative module 64.1 for feeding material to the first drill rod and a second quantitative module 64.2 for feeding material to the second drill rod, ultimately forming two independent mixing channels (the first mixing channel 305.a and the second mixing channel 305.b).

[0089] Each feeding unit 2 has two discharge ports; each discharge port is connected to a branch pipe 308 via a branch pipe 302, and the outlet of each branch pipe 308 is connected to a quantitative module 64; the discharge ends of all quantitative modules 64 connected to the same branch pipe 302 are connected to the powder conveying pipe 309; multiple powder conveying pipes 309 from different feeding units 2 and corresponding to the same mixing channel 305 are connected to the corresponding mixing channel 305; and then connected to a mixing channel 305. The outlet of each mixing channel 305 is connected to a powder-gas conveying pipe 31, and the powder-gas conveying pipes 31 connected to at least two mixing channels 305 are used to feed materials to at least two drill rods 71 ​​of a piling machine 7 respectively.

[0090] The structure of this embodiment is shown in Figure 17. Its backend includes two independent feeding units: a first feeding unit 2.a and a second feeding unit 2.b. The downstream quantitative feeding unit 6 is configured to simultaneously feed material to two independent drill rods (i.e., a dual-axis system), ultimately forming two independent mixing channels (a first mixing channel 305.a and a second mixing channel 305.b). The specific connection relationship of the system is as follows: two diversion pipes 302.a are led out from the outlet of each feeding unit, such as the first feeding unit 2.a. Each diversion pipe 302.a is connected to an independent quantitative module, such as a first quantitative module 64.1 and a second quantitative module 64.2, corresponding to one drill rod respectively. Finally, the outlets of the quantitative modules from different feeding units (the first feeding unit 2.a and the second feeding unit 2.b) but corresponding to the same drill rod converge and connect to a corresponding mixing channel. For example, the outlet of the first quantitative module 64.1 from the first feeding unit 2.a and the outlet of the first quantitative module 64.1 from the second feeding unit 2.b are connected to the first mixing channel 305.a; similarly, the outlets of the two second quantitative modules 64.2 are connected to the second mixing channel 305.b.

[0091] The single hardware structure of this embodiment can flexibly implement at least two core construction methods through program switching of the control unit 4: Parallel conveying method (for composite material supply). This method can be completely referred to as the parallel conveying method in Example 1. In this case, different powders (such as cement and fly ash) are filled into two feeding units (first feeding unit 2.a and second feeding unit 2.b), and the control unit 4 drives the two feeding units in parallel so that they simultaneously supply composite materials mixed in a preset ratio to the two shafts through their respective metering modules.

[0092] Alternating conveying method (for continuous single-material supply). This method can be completely referred to as the alternating conveying method in Embodiment 2. In this case, the same powder is filled into two feeding units (first feeding unit 2.a and second feeding unit 2.b). When one feeding unit (e.g., first feeding unit 2.a) supplies material to two shafts, the other feeding unit (second feeding unit 2.b) is in standby mode. When the material level in the main tank is too low, the system automatically and seamlessly switches to the standby tank (second feeding unit 2.b) to continue supplying material to both shafts, thereby achieving continuous and uninterrupted supply for multi-axis construction.

[0093] The advantages of this embodiment are: Ultimate flexibility: The same set of hardware equipment can be freely switched between two important construction modes, namely "high-efficiency continuous supply of single material" and "high-performance composite material supply", simply by changing the powder filling and selecting different control programs, which has extremely high versatility and flexibility.

[0094] Perfectly solves the pain points of multi-axis construction: By applying the alternating conveying method to multi-axis construction, the risk of downtime for material replenishment caused by the doubling of powder consumption rate in the "single-backstage multi-axis" scheme is completely resolved, ensuring that the high-efficiency multi-axis piling machine can play its maximum potential.

[0095] Support for superior construction techniques: Applying parallel delivery methods to multi-axis construction makes it possible to provide online, on-demand composite materials for multiple pile foundations simultaneously, providing strong technical support for some complex high-standard foundation treatment projects. Example 10

[0096] Example 10 (as shown in Figures 17 and 18) is generally similar in structure to Example 1, with the key difference being... This embodiment aims to illustrate a better implementation of the present invention. Based on the "dual-tank dual-axis" hardware structure described in Embodiment 10, the internal structure of each quantitative module 64 has been upgraded to achieve ultimate feeding stability.

[0097] The overall connection relationship in this embodiment is basically the same as that in Embodiment Nine. The core difference is that each independent metering module (e.g., the first metering module 64.1 serving the first drill pipe) includes at least two sets of valve groups connected in parallel, each set of valve groups consisting of a filling valve 61, a metering chamber 62, and an injection valve 63.

[0098] In use, the control unit 4 performs alternating cyclic operation as described in Example 3 for the two sets of valves inside each metering module, i.e., one set sprays while the other set is synchronously filled. In this way, a smooth, pulse-free continuous flow of powder can be formed at the outlet of each metering module.

[0099] Furthermore, those skilled in the art will understand that the number of valve groups within each quantitative module can be further expanded to three or more groups. In this case, a "relay" supply strategy as described in Example 4 can be adopted to achieve a more perfect seamless switching and stable feeding.

[0100] The advantages of this embodiment are: Ultimate feeding stability and uniformity: This embodiment achieves continuous, pulse-free supply along every feeding path, eliminating the high-frequency pulses inherent in single valve groups. This provides the smoothest and most uniform powder flow for each drill rod, achieving the highest feeding quality standard.

[0101] Continuous operation throughout the entire process: This configuration perfectly combines the continuity of the back-end and the front-end. The back-end achieves macroscopic continuity at the system level (no downtime due to material replenishment) through "dual tank alternation", while the front-end achieves microscopic continuity at the feeding level (pulse-free feeding) through "dual valve alternation". This enables uninterrupted operation from material storage to material discharge, making it an ideal solution for the highest intensity and highest standard construction requirements.

[0102] Perfectly embodying the modular concept: This embodiment clearly demonstrates the platform-based and modular design concept of this utility model, that is, different innovative modules (such as multiple tanks, multiple shafts, and multiple valve groups) can be freely combined according to engineering needs, and various customized solutions with functions ranging from simple to complex and performance ranging from excellent to refined can be constructed in a "building block" manner.

[0103] The detailed usage method of the construction backend described in this embodiment is the same as or substantially the same as the implementation method described in Embodiment 1, and will not be repeated here. Example 11

[0104] This embodiment aims to illustrate the specific structure and usage method of the present invention in a high-performance, highly flexible three-tank dual-axis configuration, which can meet the most diverse and stringent construction requirements.

[0105] As shown in Figure 17, its backend includes three independent feeding units (e.g., the first feeding unit 2.a, the second feeding unit 2.b, and the third feeding unit 2.c). Its downstream quantitative feeding unit 6 is configured to feed material to two independent drill rods (i.e., dual shafts) simultaneously.

[0106] The core connection of the system is as follows: the backend includes three independent quantitative feeding sub-units (first quantitative feeding sub-unit 6.a, second quantitative feeding sub-unit 6.b, and third quantitative feeding sub-unit 6.c), each corresponding to a feeding unit; each sub-unit (e.g., first quantitative feeding sub-unit 6.a) includes two quantitative modules (first quantitative module 64.1 and second quantitative module 64.2), used to feed material to the first and second drill pipes respectively. Finally, the outlets of all quantitative modules serving the same drill pipe converge into a dedicated mixing channel for that drill pipe (e.g., the three first quantitative modules 64.1 from the three sub-units converge into the first mixing channel 305.a).

[0107] Based on this three-tank dual-axis structure, this embodiment can achieve at least the following two construction methods:

[0108] This method is used to simultaneously supply a composite curing agent composed of three different powders to two drill pipes. The steps are as follows: Differentiated feeding: Three different powders are loaded into the three feeding units (first feeding unit 2.a, second feeding unit 2.b, and third feeding unit 2.c).

[0109] Parallel feeding: Control unit 4 drives all three feeding units in parallel, so that they simultaneously feed powder to the two drill rods through their respective quantitative modules.

[0110] Dynamic proportioning control: The control unit 4 independently adjusts the feeding cycle of the three quantitative modules serving each drill rod according to the preset mixing ratio of the three powders, thereby providing both drill rods with a stable composition and precise proportion of three-component composite material flow.

[0111] This method is used to continuously and uninterruptedly supply a composite curing agent consisting of two powders to two drill pipes. The steps are as follows: Differentiated feeding: The first type of powder (main material) is loaded into two feeding units (first feeding tank 210.a and second feeding tank 210.b), and the second type of powder (auxiliary material) is loaded into a third feeding unit (third feeding tank 210.c).

[0112] Composite continuous feeding: The control unit 4 first drives a main material tank (such as the first material tank 210.a) and an auxiliary material tank (the third material tank 210.c) to work in parallel, while simultaneously supplying two components of composite material to the two drill rods.

[0113] Automatic switching of main material: During operation, when the powder balance in the main material tank (first material tank 210.a) is lower than the threshold, the control unit 4 automatically and seamlessly takes over the work from the backup main material tank (second material tank 210.b) without interrupting the feeding of the auxiliary material tank (third material tank 210.c) to the two drill rods, and continues to feed the two drill rods in coordination with the auxiliary material tank.

[0114] The advantage of this embodiment is that, High performance and flexibility: The configuration of this embodiment perfectly demonstrates the highest performance of the platform of this utility model, which integrates the most diverse material selection (tri-material composite), the highest operation continuity (uninterrupted main material) and the highest construction efficiency (dual axis).

[0115] Supports the most complex construction techniques: This configuration enables the extremely complex and advanced technique of "continuous and uninterrupted construction of two-component composite piles in biaxial construction," which is completely impossible with traditional back-end equipment.

[0116] Extremely high reliability and redundancy: In the continuous supply mode of composite materials, the system not only has backup of the main material to ensure the success of long-term critical operations, but also provides sufficient technical redundancy to cope with various complex on-site conditions. Example 12

[0117] This embodiment aims to illustrate the high modularity and scalability of the single back-end quantitative feeding system of this utility model, and to demonstrate how it can flexibly serve front-end piling machines of different scales, such as three-axis, four-axis and even five-axis, by simply adding feeding branches.

[0118] The general technical principle of each configuration described in this embodiment is completely consistent with that of Embodiment 10 (dual-axis), namely: after the powder is drawn out from a single feeding unit 2, it is diverted to multiple parallel and independent feeding branches. Each branch is equipped with at least one airlock-type quantitative feeding subunit 6, and all subunits are synchronously driven by the control unit 4 to achieve precise and equal feeding of multiple drill rods. The arrangement of the lower and front drill rods in each configuration can be referred to the appendix. Figure 16 , 17 .

[0119] The first configuration is a three-axis setup. As shown in Figures 21.a and 22.a, in this configuration, the back-end quantitative feeding unit 6 is expanded to have three independent quantitative feeding sub-units connected in parallel. The outlets of these three sub-units are respectively connected to three independent pneumatic conveying paths, and finally connected to the three drill rods 71 ​​on the three-axis piling machine 7 through three powder-air conveying pipes 31. During operation, the control unit 4 synchronously drives these three units to simultaneously execute the "filling-jetting" cycle, thereby achieving independent, non-interfering, and precisely equal pulsed powder supply to the three drill rods from a single back-end unit.

[0120] In this configuration, each quantitative feeding subunit (e.g., the first quantitative feeding subunit 6.a) includes three parallel quantitative modules: the first, second, and third quantitative modules (64.1, 64.2, 64.3). Ultimately, the outlets of all first quantitative modules 64.1 converge to serve the first drill rod; the outlets of all second quantitative modules 64.2 converge to serve the second drill rod; and the outlets of all third quantitative modules 64.3 converge to serve the third drill rod. During operation, the control unit 4 synchronously drives all six quantitative modules (in a dual-tank, three-axis configuration) to work collaboratively, achieving precise and equal feeding of the three drill rods.

[0121] The second configuration is a four-axis configuration. In this configuration, each quantitative feeding subunit includes four parallel quantitative modules (first quantitative module 64.1, second quantitative module 64.2, third quantitative module 64.3, and fourth quantitative module 64.4), each corresponding to one of the four drill rods. The drill rods are arranged in either a straight line or a 2x2 matrix. The control method is essentially the same as the aforementioned three-axis configuration and will not be repeated here.

[0122] The third configuration is a five-axis configuration. In this configuration, each quantitative feeding subunit is further expanded to include five parallel quantitative modules (first quantitative module 64.1, second quantitative module 64.2, third quantitative module 64.3, fourth quantitative module 64.4, and fifth quantitative module 64.5), each corresponding to one of the five drill pipes. The operation method is the same as the configurations described above, and will not be repeated here.

[0123] The advantages of this embodiment are: High scalability and modularity: This embodiment clearly demonstrates that the technical solution of this utility model allows the back-end supply capacity to be flexibly expanded from two axes to three axes, four axes, five axes or even more axes by simply adding a set quantity feeding sub-unit branch, in order to adapt to piling equipment of any size.

[0124] Significant economic benefits: This scalability is achieved without sacrificing supply accuracy and equivalence. Compared to the traditional approach of equipping N-axis pile drivers with N independent back-end systems, this invention offers significant advantages in terms of equipment procurement costs, site footprint, total energy consumption, and the complexity of subsequent maintenance and management.

[0125] Functionality Upgradeable: Similar to Embodiment 1, any or all feeding branches in this embodiment can be upgraded as needed to a "continuous supply module" consisting of two or more alternating sub-units to achieve pulse-free continuous feeding of the corresponding drill rod, further improving construction quality.

[0126] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A multi-mode collaborative airlock quantitative feeding powder jet grouting backing system, characterized in that, The system includes an air supply unit (1), at least two feeding units (2), a quantitative feeding unit (6), a pneumatic conveying unit (3), and a control unit (4) for coordinating the operation of each unit. The quantitative feeding unit (6) includes quantitative feeding sub-units corresponding to the feeding units (2), and each quantitative feeding sub-unit includes at least one quantitative module (64). The pneumatic conveying unit (3) includes a branch pipe (302), a diversion pipe (308), a powder conveying pipe (309), and a mixing channel (305). Each feeding unit (2) has at least one discharge port, and each discharge port is connected to a pneumatic conveying unit (4). The branch pipe (302) is connected to at least one branch pipe (308), and the outlet of each branch pipe (308) is connected to a quantitative module (64); the outlets of all quantitative modules (64) connected to the same branch pipe (302) are connected to a powder conveying pipe (309); the multiple powder conveying pipes (309) from different feeding units (2) are then connected to a mixing channel (305); the control unit (4) is used to control at least two feeding units (2) to feed materials to the quantitative feeding unit (6) in an alternating working mode or a parallel working mode.

2. The multi-mode collaborative airlock quantitative feeding powder jet grouting back-end according to claim 1, characterized in that, Each of the feeding units (2) has at least two outlets; each outlet is connected to at least one branch pipe (308) via a branch pipe (302), and the outlet of each branch pipe (308) is connected to a quantitative module (64); the outlets of all quantitative modules (64) connected to the same branch pipe (302) converge and connect to the powder conveying pipe (309); multiple powder conveying pipes (309) from different feeding units (2) and corresponding to the same mixing channel (305) converge and connect to the corresponding mixing channel (305); the outlet of each mixing channel (305) is connected to a powder-gas conveying pipe (31), and the powder-gas conveying pipes (31) connected to at least two mixing channels (305) are used to feed materials to at least two drill rods (71) of a piling machine (7).

3. The multi-mode collaborative airlock quantitative feeding powder jet grouting backing system according to claim 1 or 2, characterized in that, Each of the metering modules (64) consists of a set of filling valves (61), metering chambers (62) and injection valves (63) arranged sequentially along the powder flow direction; the inlet of the filling valve (61) is connected to the outlet of the branch pipe (302); the outlet of the injection valve (63) is connected to the inlet of the mixing channel (305); the control unit (4) is configured to perform an intermittent basic metering cycle on the metering modules (64).

4. The multi-mode collaborative airlock quantitative feeding powder jet grouting backing system according to claim 1, characterized in that, It includes at least two parallel feeding groups; at least one of the feeding groups is a continuous feeding group, which includes at least two feeding units (2) for filling the same powder and is configured to work alternately to form a continuous and uninterrupted supply of the powder; the remaining feeding groups are conventional feeding groups, which include at least one feeding unit (2); and the control unit (4) is configured to drive all feeding units (2) to work in parallel to form and supply a composite powder flow.

5. The multi-mode collaborative airlock quantitative feeding powder jet grouting backing system according to claim 1 or 2, characterized in that, The quantitative module (64) includes at least two sets of valve groups arranged in parallel, each consisting of a filling valve (61), a quantitative chamber (62), and an injection valve (63); and the control unit (4) is configured to drive the at least two sets of valve groups to perform alternating cyclic operation. When one set of valve groups performs the injection step, the other set or more sets of valve groups simultaneously perform the filling step, so as to achieve continuous and uninterrupted feeding of the outlet of the quantitative module (64).

6. The multi-mode collaborative airlock quantitative feeding powder jet grouting back-end according to claim 1, characterized in that, There is one air supply unit (1), and the air supply unit (1) is used to provide a conveying air source to the pneumatic conveying unit (3) and a pressurized air source to the feeding unit (2); the pneumatic conveying unit (3) also includes an air supply pipe (303) corresponding to the feeding unit (2); the air inlet end of the air supply pipe (303) is connected to the air supply unit (1); the air outlet end of the air supply pipe (303) is connected to the mixing channel (305); each feeding unit (2) is connected to its corresponding air supply pipe (303) through a corresponding feeding tank air inlet pipe (214); the feeding tank air inlet pipe (214) is configured to form a bidirectional air passage for conveying the compressed air of the air supply unit (1) to the feeding unit (2) connected to it as its pressurized air source; or conveying the high-pressure gas in the feeding unit (2) connected to it in reverse to the air supply pipe (303) connected to it as a conveying air source.

7. The multi-mode collaborative airlock quantitative feeding powder jet grouting backing system according to claim 1, characterized in that, The number of the air supply units (1) is at least two; one air supply unit (1) is used to provide pressurized air to the feeding unit (2); the other air supply unit (1) is used to provide conveying air to the pneumatic conveying unit (3); the pneumatic conveying unit (3) also includes at least one air conveying pipe (303); the air inlet end of the air conveying pipe (303) is connected to one of the air supply units (1), and the air supply unit (1) provides conveying air to the air conveying pipe (303); the air outlet end of the air conveying pipe (303) is connected to the mixing channel (305).

8. The multi-mode collaborative airlock quantitative feeding powder jet grouting back-end according to claim 6 or 7, characterized in that, The angle formed by the intersection of the central axis of the gas supply pipe (303) and the central axis of the mixing channel (305) is less than 60°; when there are multiple gas supply pipes (303), the gas supply pipes (303) are distributed at intervals along the circumference or axial direction of the mixing channel (305).

9. The multi-mode collaborative airlock quantitative feeding powder jet grouting backing system according to claim 1, characterized in that, Each feeding unit (2) includes a feeding tank body (210), a support frame (212), a connecting flange (211), and a feeding tank exhaust pipe (215); the feeding tank body (210) is mounted on the support frame (212), the inlet of the connecting flange (211) is connected to the outlet of the feeding tank body (210), and the outlet of the connecting flange (211) is connected to a guide pipe (301); the outlet of the guide pipe (301) is connected to the inlet of a branch pipe (302); a vibrator (213) is also provided at the bottom of the feeding tank body (210); the feeding tank exhaust pipe (215) is connected to the feeding tank body (210).

10. The multi-mode collaborative airlock quantitative feeding powder jet grouting backing system according to claim 9, characterized in that, The control unit (4) includes a sensor group, a valve group, and a central control cabinet (42); the sensor group includes a weighing sensor (401) for monitoring the weight of the powder curing agent in the conveying tank body (210) and a conveying tank pressure gauge (403) for monitoring the pressure inside the tank. The weight of the conveying tank body (210) is supported by at least three weighing sensors (401), each weighing sensor (401) is fixed on the support frame (212), and the conveying tank body (210) is vertically pressed on the weighing sensor (401). The conveying tank pressure gauge (403) is installed on the conveying tank body (210); the valve group includes a feed valve (411), a conveying tank pressurization valve (413), and a conveying valve. The material tank exhaust valve (414) and the main air circuit switch valve (418) are provided; the feed valve (411) is provided on the material tank body (210) and is used for replenishing the powder curing agent; the material tank pressurization valve (413) is provided on the material tank air inlet pipe (214); the material tank exhaust valve (414) is provided on the material tank exhaust pipe (215); the main air circuit switch valve (418) is provided on the output air circuit of the air supply unit (1); and the output air circuit of the air supply unit (1) is also provided with a main air pressure gauge (402); the central control cabinet (42) is provided on the support frame (212); the central control cabinet (42) is electrically connected to the vibrator (213), valve group, sensor group and the quantitative feeding unit (6).

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