Self-unblocking type grouting pipe and grouting device

Abstract

The invention discloses a self-unblocking grouting pipe and a grouting device, belongs to the technical field of civil engineering, and is used for realizing efficient, real-time and targeted self-unblocking of the grouting pipe. According to the main technical scheme, the self-unblocking type grouting pipe comprises an inner pipe and an outer pipe, the inner pipe is a pipe body for conveying slurry, the outer pipe is arranged on the periphery of the inner pipe in a sleeving mode, a closed cavity is defined between the outer pipe and the inner pipe, and the closed cavity is filled with high-pressure water; the inner pipe is provided with a straight pipe section and a bent pipe section which are communicated, the straight pipe section is arranged on the upstream side of the bent pipe section in the slurry conveying flow path direction of the inner pipe, a differential pressure valve control assembly is arranged on the straight pipe section, and a blockage clearing assembly is arranged on the pipe wall of the bent pipe section. The two pressure difference detection ends of the pressure difference valve control assembly communicate with the end, close to the bent pipe section, of the straight pipe section and the end, away from the bent pipe section, of the straight pipe section correspondingly, and the pressure difference valve control assembly further communicates with the closed cavity and the unblocking assembly correspondingly so as to control connection and disconnection of a high-pressure water flow path between the closed cavity and the unblocking assembly according to the pressure difference between the two ends of the straight pipe section.

Description

Technical Field

[0001] This application belongs to the field of civil engineering technology, specifically relating to a self-cleaning grouting pipe and grouting device. Background Technology

[0002] In related technologies, when cleaning a blocked grouting pipe, the grouting device must first be stopped, the grout in the pipe emptied, and then the blockage cleared using wire hooks, high-pressure guns, and chemical reagents. This method requires disassembling the grouting pipe, which is very time-consuming and labor-intensive, and is only suitable for cleaning straight sections of the grouting pipe. Grout accumulation and blockage are more likely to occur at bends in the grouting pipe, and these blockages are difficult to detect. Existing methods cannot effectively and promptly clear bends in the grouting pipe, thus affecting the normal flow of grout within the pipe. Summary of the Invention

[0003] In view of this, this application provides a self-cleaning grouting pipe and grouting device, the main purpose of which is to achieve efficient, real-time and targeted self-cleaning of the grouting pipe, and to ensure the continuous and stable progress of grouting operations.

[0004] To achieve the above objectives, this application mainly provides the following technical solutions: One aspect of this application provides a self-cleaning grouting pipe, comprising an inner pipe and an outer pipe. The inner pipe is a grout conveying pipe, and the outer pipe is sleeved around the outer periphery of the inner pipe, forming a closed cavity with the outer pipe and the inner pipe. The closed cavity is filled with high-pressure water. The inner pipe has a straight section and a curved section connected to each other. The straight section is located upstream of the curved section along the grout conveying flow path of the inner pipe. A differential pressure valve control assembly is provided on the straight section, and a clogging removal assembly is provided on the wall of the curved section. The two differential pressure detection ends of the differential pressure valve control assembly are respectively connected to the end of the straight section closer to the curved section and the end of the straight section farther from the curved section. The differential pressure valve control assembly is also connected to the closed cavity and the clogging removal assembly to control the opening and closing of the high-pressure water flow path between the closed cavity and the clogging removal assembly based on the pressure difference between the two ends of the straight section.

[0005] Optionally, the differential pressure valve control assembly includes a differential pressure opening and closing mechanism and two pressure sensing mechanisms. The two pressure sensing mechanisms are respectively connected to one end of the straight pipe section near the bend and the other end of the straight pipe section away from the bend. The differential pressure opening and closing mechanism is respectively connected to the closed cavity, the unblocking assembly, and the two pressure sensing mechanisms.

[0006] Optionally, the differential pressure on / off mechanism includes a valve body, a valve core, and a pressure transmission tube. The two ends of the valve body are respectively connected to the two pressure sensing mechanisms through the pressure transmission tube. The pressure transmission tube is filled with a pressure-transmitting fluid. The valve core is movably disposed within the valve body. The valve body has two oppositely arranged flow holes along its radial direction. The two flow holes are respectively connected to the closed cavity and the unblocking component. The valve core is provided with a guide hole. The guide hole penetrates the valve core along the opposite direction of the two flow holes. The valve core can move under the force of the pressure difference formed by the two pressure sensing mechanisms after being transmitted by the pressure-transmitting fluid, and the valve core can move to the position where the two ends of the guide hole are respectively connected to the two flow holes.

[0007] Optionally, the valve core has a first elastic element abutting on both axial sides, and a pressure transmitting block abutting at the end of the first elastic element away from the valve core. The pressure transmitting block is in a sealing sliding fit with the inner wall of the valve body. The valve body has end caps at both ends of the opening. The end caps have a channel structure that cooperates with the pressure transmitting pipe and allows the pressure transmitting fluid to flow. The axial inner end face of the end cap is used to abut the end face of the pressure transmitting block facing the end of the valve body to limit the axial sliding stroke of the pressure transmitting block in the valve body.

[0008] Optionally, the pressure sensing mechanism includes a first sliding head, a first sliding column, a second elastic element, and a positioning element; a first sliding hole is formed on the wall of the inner tube, the first sliding hole penetrates the wall of the inner tube, the positioning element is fixedly disposed on the outer wall of the inner tube corresponding to the first sliding hole, and the positioning element is provided with a first limiting step surface; a pipe joint is assembled at the opening of the pressure transmitting tube, the pipe joint is fitted and connected to the first limiting step surface of the positioning element; the first sliding head is coaxially and fixedly connected to the first sliding column, the first sliding head is embedded in the first sliding hole, and is sealed and slidably engaged with the hole wall of the first sliding hole; the first sliding column extends into the pipe joint in a direction away from the inner tube, and is sealed and slidably engaged with the inner side wall of the pipe joint; the second elastic element is sleeved on the first sliding column, one end of the second elastic element abuts against the first sliding head, and the other end abuts against the end face of the pipe joint facing the first sliding hole.

[0009] Optionally, the unblocking assembly includes a connecting cylinder, a water supply pipe, a second sliding head, a second sliding column, a rotating cylinder, and a third elastic element; a second sliding hole is formed on the wall of the inner pipe, the second sliding hole penetrates the wall of the inner pipe, the connecting cylinder is fixedly disposed on the outer wall of the inner pipe corresponding to the position of the second sliding hole, and a clearance hole is formed on the bottom inner side of the connecting cylinder, the clearance hole is coaxially connected and communicates with the second sliding hole; one end of the water supply pipe is connected to the differential pressure valve control assembly, and the other end is connected to the top of the connecting cylinder, for conveying high-pressure water into the connecting cylinder; the second sliding head is coaxially fixedly connected to the second sliding column, the second sliding head is disposed inside the connecting cylinder and is in a sealing sliding fit with the inner wall of the connecting cylinder, the second sliding column extends in the direction close to the inner pipe, and passes through the clearance hole and the second sliding hole in sequence; the rotating cylinder is rotatably sleeved on the outer periphery of the second sliding column, and the rotating cylinder, the second sliding column, and the second sliding head form a receiving cavity for the flow and temporary storage of high-pressure water; The second sliding head and the second sliding column have through-flow channels inside. One end of the channel penetrates the top surface of the second sliding head and communicates with the internal space of the connecting cylinder to receive the high-pressure water supplied by the water supply pipe. The other end extends to the position corresponding to the receiving cavity. A water passage hole is provided on the side wall of the second sliding column. One end of the water passage hole communicates with the channel and the other end communicates with the receiving cavity to guide the high-pressure water in the channel into the receiving cavity. The side wall of the rotating cylinder has evenly spaced anti-blocking spray slits along the circumference of the rotating cylinder. The anti-blocking spray slits penetrate the side wall of the rotating cylinder radially to spray the high-pressure water in the receiving cavity towards the outer circumference of the rotating cylinder to achieve anti-blocking. The third elastic element is sleeved on the part of the second sliding column located inside the connecting cylinder. One end of the third elastic element abuts against the end face of the second sliding head facing the clearance hole, and the other end abuts against the inner bottom of the connecting cylinder to provide the second sliding head with a restoring elastic force towards the top of the connecting cylinder.

[0010] Optionally, a retaining ring is provided at the bottom inner side of the connecting cylinder. The retaining ring is coaxially surrounding the outer circumference of the rotating cylinder. The inner wall of the retaining ring is used to fit against the outer wall of the rotating cylinder when the second sliding head is subjected to the reset elastic force of the third elastic element and drives the rotating cylinder to the initial position, so as to seal the unclogging spray seam.

[0011] Optionally, the opening of the unclogging spray slit is inclined downward in a direction away from the central axis of the rotating drum.

[0012] Optionally, an optical fiber sensor is provided on the outer wall of the inner tube.

[0013] Another aspect of this application provides a grouting device, including the self-cleaning grouting pipe described in any one of the above claims.

[0014] By employing the above technical solution, this application has at least the following beneficial effects: This application provides a self-cleaning grouting pipe and grouting device. The self-cleaning grouting pipe forms a closed cavity filled with high-pressure water by enclosing an inner pipe and an outer pipe. In conjunction with a differential pressure valve control component on the straight pipe section, it detects the pressure difference between the two ends of the straight pipe section, enabling timely detection of blockage in the grouting pipe. This solves the problem of blockage in bends being difficult to detect. Furthermore, the differential pressure valve control component can automatically control the opening and closing of the high-pressure water flow path between the closed cavity and the blockage-clearing component on the pipe wall of the bend based on the detected pressure difference. This allows the high-pressure water in the closed cavity to be delivered to the blockage-clearing component, enabling targeted real-time blockage clearing operations on bends prone to grout accumulation and blockage. This overcomes the limitation of existing unblocking methods, which are only applicable to straight pipe sections and cannot effectively clear bends. At the same time, the entire blockage clearing process does not require stopping the machine to drain the grout or disassembling the grouting pipe, avoiding the time-consuming and labor-intensive problems of traditional blockage clearing methods. It effectively ensures the normal transport flow path of the grout in the inner pipe, maintains the normal flow of the grout, and improves the overall efficiency of grouting operations. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a self-cleaning grouting pipe according to an optional embodiment of this application; Figure 2 This is a cross-sectional view of a self-cleaning grouting pipe according to an optional embodiment of this application; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is an exploded view of a differential pressure shut-off mechanism according to an optional embodiment of this application; Figure 5 for Figure 2 A magnified view of a section at point B in the middle; Figure 6 for Figure 2 A magnified view of a section at point C; Figure 7 This is a three-dimensional structural diagram of the rotating drum according to an optional embodiment of this application.

[0016] The reference numerals in the attached figures are as follows: 1. Inner pipe; 11. Straight pipe section; 111. First sliding hole; 12. Bend section; 121. Second sliding hole; 2. Outer pipe; 3. Differential pressure valve control assembly; 31. Differential pressure on / off mechanism; 311. Valve body; 3111. Flow passage; 312. Valve core; 3121. Flow guide hole; 313. Pressure transmission pipe; 3131. Pipe joint; 314. First elastic element; 315. Pressure transmission block; 316. End cap; 32. Pressure sensing mechanism; 3 21. First sliding head; 322. First sliding column; 323. Second elastic element; 324. Positioning element; 4. Unblocking assembly; 41. Connecting cylinder; 411. Clearing hole; 412. Retaining ring; 42. Water supply pipe; 43. Second sliding head; 431. Guide groove; 44. Second sliding column; 441. Water passage hole; 45. Rotating cylinder; 451. Unblocking spray gap; 46. Third elastic element; 47. Limiting sealing plate; 5. Fiber optic sensor. Detailed Implementation

[0017] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0021] See also Figures 1 to 7 As shown, an embodiment of the first aspect of this application provides a self-cleaning grouting pipe, and an embodiment of the second aspect of this application provides a grouting device.

[0022] Among them, the self-cleaning grouting pipe is used in the grouting device.

[0023] Specifically, the grouting device includes a grout supply component, the aforementioned self-cleaning grouting pipe, a pipeline connection and sealing component, and a grouting execution component. The grout supply component stores the grout to be injected and provides initial power for grout delivery. It includes a hopper, a mixing unit, and a feed pump. The hopper holds grouting materials such as cement slurry and mortar. The mixing unit, located inside the hopper, is driven by a motor to rotate the mixing paddle, preventing sedimentation and stratification of the grout during storage and ensuring grout uniformity. The feed pump's input end is connected to the bottom of the hopper, and its output end is sealed to the input end of the self-cleaning grouting pipe, providing power for grout delivery. The aforementioned self-cleaning grouting pipe, as the core delivery and unblocking component, connects its input end to the feed pump via a pipeline connection and sealing component, and its output end extends to the grouting execution component. This allows for automatic detection and cleaning of blockages during grout delivery, ensuring smooth grout delivery without additional disassembly. The pipeline connection and sealing assembly includes a sealing joint and a buffer component. The sealing joint connects the feed pump to the self-cleaning grouting pipe and the self-cleaning grouting pipe to the grouting nozzle, preventing grout leakage. The buffer component is located at the connection between the grout supply assembly and the self-cleaning grouting pipe to alleviate pressure shocks during grout delivery and protect the stable operation of each component. The grouting execution assembly includes a grouting nozzle and a positioning bracket. The grouting nozzle connects to the output end of the self-cleaning grouting pipe, and the nozzle has a flow regulating hole to control the grouting rate and diffusion range. The positioning bracket is used to fix the position of the grouting nozzle and the self-cleaning grouting pipe, ensuring accurate grouting direction and preventing pipeline deviation due to its own weight or operational vibration.

[0024] Further, see Figures 1 to 7 As shown, the self-cleaning grouting pipe provided in the first aspect of this application includes an inner pipe 1 and an outer pipe 2. The inner pipe 1 is a pipe body for conveying grout, and the outer pipe 2 is sleeved on the outer periphery of the inner pipe 1, and the outer pipe 2 and the inner pipe 1 enclose a closed cavity, which is filled with high-pressure water. The inner pipe 1 has a straight pipe section 11 and a bent pipe section 12 that are connected. The straight pipe section 11 is located upstream of the bent pipe section 12 along the grout conveying flow path of the inner pipe 1. A differential pressure valve control component 3 is provided on the straight pipe section 11, and a blockage clearing component 4 is provided on the pipe wall of the bent pipe section 12. The two differential pressure detection ends of the differential pressure valve control component 3 are respectively connected to the end of the straight pipe section 11 near the bent pipe section 12 and the end of the straight pipe section 11 away from the bent pipe section 12. The differential pressure valve control component 3 is also connected to the closed cavity and the blockage clearing component 4, so as to control the opening and closing of the high-pressure water flow path between the closed cavity and the blockage clearing component 4 according to the pressure difference between the two ends of the straight pipe section 11.

[0025] In this embodiment, the self-cleaning grouting pipe forms a closed cavity filled with high-pressure water by the inner pipe 1 and the outer pipe 2. The differential pressure valve control component 3 on the straight pipe section 11 detects the pressure difference between the two ends of the straight pipe section 11, enabling timely detection of blockages in the grouting pipe. This solves the problem of blockages in the bend section 12 being difficult to detect. Furthermore, the differential pressure valve control component 3 can automatically control the flow of high-pressure water between the closed cavity and the unblocking component 4 on the wall of the bend section 12 based on the detected pressure difference. This allows the high-pressure water in the closed cavity to be delivered to the unblocking component 4, enabling targeted real-time unblocking of the bend section 12, which is prone to grout accumulation and blockage. This overcomes the limitation of existing unblocking methods, which are only applicable to the straight pipe section 11 and cannot effectively unblock the bend section 12. Simultaneously, the entire unblocking process does not require stopping the machine to drain the grout or disassembling the grouting pipe, avoiding the time-consuming and labor-intensive problems of traditional unblocking methods. This effectively ensures the normal flow of grout within the inner pipe 1, maintains normal grout flow, and improves the overall efficiency of the grouting operation.

[0026] The self-cleaning grouting pipe consists of two main pipes, an inner pipe 1 and an outer pipe 2, which form a nested structure.

[0027] Specifically, the outer pipe 2 and the inner pipe 1 are coaxially sleeved. The inner pipe 1 is the pipe body that directly undertakes the task of grouting. All grouting operations are completed through the internal channel of the inner pipe 1. The outer pipe 2 is sleeved on the outer periphery of the inner pipe 1 and together with the outer wall of the inner pipe 1, they form a sealed closed cavity. This closed cavity is used to store high-pressure water to provide a power source for subsequent unblocking operations. The pre-filling of high-pressure water can ensure a rapid response to unblocking operations without the need for additional temporary water supply. Based on this, the aforementioned grouting device also includes a high-pressure water supply unit. The self-cleaning grouting pipe is used in conjunction with the high-pressure water supply unit. The high-pressure water supply unit is used to fill the closed cavity of the self-cleaning grouting pipe with high-pressure water and maintain the pressure stability in the closed cavity. It includes a high-pressure water pump, a water storage tank, and a pressure regulating valve. The output end of the high-pressure water pump is connected to the closed cavity. The water storage tank is used to buffer the water source required for cleaning. The pressure regulating valve can adjust the high-pressure water pressure in the closed cavity to a range suitable for the cleaning operation. At the same time, the high-pressure water supply unit is also equipped with a check valve to prevent the high-pressure water in the closed cavity from flowing back.

[0028] To change the direction of grout delivery and adapt to the delivery needs of different spatial locations during grouting operations, allowing the grout to smoothly transition from the straight section 11 of the inner pipe 1 to the target grouting area and complete the turning delivery, the inner pipe 1 has a curved section 12 connected to the straight section 11 downstream of it. Considering actual grouting applications, the curved section 12, due to the turning of the flow channel, increases the grout flow resistance, making it prone to grout retention and accumulation, and is a high-risk area for blockage in the entire grouting pipe. In contrast, the straight section 11 has a straight and smooth flow channel, and the probability of grout flow obstruction is much lower than that of the curved section 12, resulting in a relatively lower risk of blockage.

[0029] To achieve automatic detection and unblocking of blockages in the bend section 12, a differential pressure valve control assembly 3 is installed on the straight pipe section 11, and an unblocking assembly 4 is installed on the pipe wall of the bend section 12. Together with the closed cavity filled with high-pressure water, they form a complete self-unblocking system. During operation, the two differential pressure detection ends of the differential pressure valve control assembly 3 are connected to both ends of the straight pipe section 11, namely the end of the straight pipe section 11 closest to the bend section 12 and the end furthest from the bend section 12. By monitoring the pressure difference between these two locations in real time, it is possible to accurately determine whether a blockage has occurred in the grouting pipe. Simultaneously, the differential pressure valve control assembly 3 is also connected to both the closed cavity and the unblocking assembly 4 on the pipe wall of the bend section 12, forming a controllable high-pressure water flow path.

[0030] Specifically, when the slurry is transported in the inner pipe 1, if slurry blockage occurs in the bend section 12, the pressure at the end of the straight pipe section 11 near the bend section 12 will be greater than the pressure at the end away from the bend section 12. After detecting this pressure difference change, the differential pressure valve control component 3 automatically opens the high-pressure water flow path between the closed cavity and the unblocking component 4. The high-pressure water in the closed cavity enters the unblocking component 4 through the differential pressure valve control component 3. The unblocking component 4 introduces the high-pressure water into the bend section 12 and forms a high-pressure water flow. The impact of the high-pressure water flow disperses and cleans the slurry blockage in the bend section 12, achieving self-cleaning and self-unblocking of the bend section 12. After the blockage is cleared, the pressure difference between the two ends of the straight pipe section 11 returns to the normal range, and the differential pressure valve control component 3 automatically cuts off the high-pressure water flow path, stopping the unblocking operation. The grouting operation can continue normally. The entire process requires no manual intervention and no machine shutdown or disassembly, realizing automatic detection and real-time unblocking of the bend section 12.

[0031] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the differential pressure valve control assembly 3 includes a differential pressure opening and closing mechanism 31 and two pressure sensing mechanisms 32. The two pressure sensing mechanisms 32 are respectively connected to the end of the straight pipe section 11 near the bend section 12 and the end of the straight pipe section 11 away from the bend section 12. The differential pressure opening and closing mechanism 31 is respectively connected to the closed cavity, the unblocking assembly 4, and the two pressure sensing mechanisms 32.

[0032] In this embodiment, the two pressure sensing mechanisms 32 can accurately collect pressure signals from the end of the straight pipe section 11 near the bend section 12 and the end away from the bend section 12, respectively, providing accurate differential pressure basis for the differential pressure opening and closing mechanism 31. Through the connection with the closed cavity, the unblocking component 4 and the two pressure sensing mechanisms 32, the differential pressure opening and closing mechanism 31 can accurately control the opening and closing of the high-pressure water flow path based on the collected pressure signals, thereby realizing accurate detection and timely unblocking of the bend section 12 blockage, ensuring the stable and reliable operation of the self-unblocking function of the self-unblocking grouting pipe.

[0033] It is understood that there are multiple ways to implement the state switching of the differential pressure switching mechanism 31. For example, the state switching of the differential pressure switching mechanism 31 can be driven by a pressure-transmitting fluid such as hydraulic oil; for example, see [link to relevant documentation]. Figure 3 and Figure 4As shown, the differential pressure on / off mechanism 31 includes a valve body 311, a valve core 312, a pressure transmission pipe 313, a first elastic element 314, a pressure transmission block 315, and an end cap 316. Both ends of the valve body 311 are connected to two pressure sensing mechanisms 32 via the pressure transmission pipe 313. The pressure transmission pipe 313 is filled with a pressure-transmitting fluid such as hydraulic oil. The valve core 312 is movably disposed within the valve body 311. The first elastic element 314 abuts against both axial sides of the valve core 312. The end of the first elastic element 314 away from the valve core 312 abuts against the pressure transmission block 315. The pressure transmission block 315 seals against the inner wall of the valve body 311. Sliding fit; In addition, in order to further improve the guiding accuracy of the axial sliding of the valve core 312 and the pressure transmitting block 315 in the valve body 311, prevent deviation and jamming during sliding, and enhance the stability of the sealing fit, the outer peripheral surfaces of the valve core 312 and the pressure transmitting block 315 are provided with locking blocks, and the inner sidewall of the valve body 311 is provided with axial sliding grooves that are adapted to the locking blocks. Under the guiding and limiting effect of the locking blocks and the sliding grooves, the pre-tightening force of the first elastic element 314, and the pressure of the pressure transmitting fluid, the valve core 312 and the pressure transmitting block 315 maintain a sealed sliding fit with the inner wall of the valve body 311.Both ends of the valve body 311 are provided with end caps 316. The end caps 316 have channels that cooperate with the pressure-transmitting pipe 313 and allow the pressure-transmitting fluid to flow. The axial inner end face of the end cap 316 abuts against the end face of the pressure-transmitting block 315 facing the end of the valve body 311, thus limiting the axial sliding stroke of the pressure-transmitting block 315 within the valve body 311. The valve body 311 has two oppositely arranged flow holes 3111 along its radial direction. The two flow holes 3111 are respectively connected to the closed cavity and the unblocking assembly 4. The valve core 312 has a guide hole 3121 that penetrates the valve core 312 along the opposite direction of the two flow holes 3111, allowing flow through the two pressure sensing mechanisms. The pressure difference generated by 32 moves under the force of the pressure-transmitting fluid to the position where the two ends of the guide hole 3121 are connected to the two flow holes 3111 respectively. During use, the pressure-transmitting fluid flows into the end of the valve body 311 through the channel structure of the end cover 316, acts on the pressure-transmitting block 315, and transmits the pressure to the first elastic element 314 through the pressure-transmitting block 315. Then, the first elastic element 314 acts on both ends of the valve core 312. When the bend section 12 of the inner tube 1 is not blocked, the pressure difference between the two ends of the straight section 11 is small. The pressure transmitted by the pressure-transmitting fluid is insufficient to overcome the preload force of the first elastic element 314 after acting on the valve core 312 through the pressure-transmitting block 315 and the first elastic element 314. When the valve core 312 moves, it remains relatively stationary under the constraint of the locking block and the sliding groove. The guide hole 3121 and the two flow holes 3111 are not connected to each other, and the high-pressure water flow path between the closed cavity and the unblocking component 4 is disconnected. When the blockage of the bend section 12 causes a significant pressure difference between the two ends of the straight section 11, the pressure at the end of the straight section 11 closer to the bend section 12 is greater than the pressure at the end farther away. This pressure difference is transmitted to the first elastic elements 314 on both sides through the pressure-transmitting fluid and the pressure-transmitting block 315, causing the valve core 312 to be unbalanced and pushing it to move along the sliding groove towards the end with lower pressure. At this time, the first elastic element 314 on the corresponding side is compressed until the valve core 312 moves to the guide hole 312. 1. The two flow holes 3111 are precisely aligned and connected. The high-pressure water in the closed cavity enters the guide hole 3121 through one of the flow holes 3111, and then flows to the unblocking component 4 through the other flow hole 3111 to provide a high-pressure water source. After the blockage is cleared, the pressure at both ends of the straight pipe section 11 returns to balance, and the force on both sides of the valve core 312 tends to be consistent. The compressed first elastic element 314 releases its elastic force to push the valve core 312 to reset along the slide groove. The pressure transmission block 315 also moves and resets with the valve core 312 and is limited by the end cover 316. The guide hole 3121 is disconnected from the flow hole 3111, the high-pressure water flow path is cut off, the differential pressure switching mechanism 31 returns to the initial state, and stops supplying water to the unblocking component 4.

[0034] It is understandable that the pressure sensing mechanism 32 can acquire pressure signals from the end of the straight pipe section 11 near the bend section 12 and the end away from the bend section 12 in various ways. For example, the pressure sensing mechanism 32 can acquire pressure signals through a mechanical sliding pressure transmission structure; for example, see [link to relevant documentation]. Figure 5As shown, the pressure sensing mechanism 32 includes a first sliding head 321, a first sliding column 322, a second elastic element 323, and a positioning element 324; a first sliding hole 111 is provided on the wall of the inner tube 1, the first sliding hole 111 penetrates the wall of the inner tube 1, the positioning element 324 is fixedly disposed on the outer wall of the inner tube 1 corresponding to the position of the first sliding hole 111, and the positioning element 324 is provided with a first limiting step surface; a pipe connector 3131 is assembled at the pipe opening of the pressure transmitting pipe 313, the pipe connector 3131 is fitted and fixedly connected to the first limiting step surface of the positioning element 324; the first sliding head 321 is coaxially fixedly connected to the first sliding column 322, the first sliding head 321 is embedded in the first sliding hole 111, and is sealed and slidingly engaged with the hole wall of the first sliding hole 111; the first The sliding column 322 extends into the pipe joint 3131 in a direction away from the inner tube 1 and is in a sealing sliding fit with the inner wall of the pipe joint 3131. The second elastic element 323 is sleeved on the first sliding column 322, and its two ends are respectively fixed to the first sliding head 321 and the pipe joint 3131. Specifically, one end of the second elastic element 323 is fixed to the end face of the first sliding head 321 facing the pipe joint 3131, and the other end is fixed to the end face of the pipe joint 3131 facing the first sliding hole 111. Based on this, the first sliding head 321 and the first sliding column 322 can be prevented from falling into the inner tube 1 under the action of gravity or slurry impact, while ensuring that the second elastic element 323 can only deform along the axial direction of the first sliding column 322, thus ensuring the pressure transmission accuracy. During use, when the bend section 12 becomes blocked, causing a significant pressure difference between the two ends of the straight section 11, the two pressure sensing mechanisms 32 will act according to the pressure difference at their respective locations: the pressure sensing mechanism 32 mounted on the end of the straight section 11 near the bend section 12 will exert a strong thrust on the first sliding head 321 due to the high pressure of the slurry in the inner pipe 1, pushing the first sliding head 321 to slide along the wall of the first sliding hole 111 away from the inner pipe 1 in a sealing manner. Simultaneously, it will drive the coaxially fixed first sliding column 322 to move into the pipe joint 3131. At this time, the second elastic element 323 will be compressed and deformed. Since both ends are fixed to the first sliding head 321 and the pipe joint 3131 respectively, it will always keep the two in a limited position to prevent them from shifting or falling off. The first sliding column 322 will maintain a sealing slide with the inner wall of the pipe joint 3131 during movement. Its end away from the first sliding head 321 will continuously squeeze the pressure-transmitting fluid in the pressure transmission pipe 313, transmitting the high-pressure end pressure signal. The pressure sensing mechanism 32, which is installed at the end of the straight pipe section 11 away from the bend section 12, cannot overcome the rebound force of the second elastic element 323 to push the first sliding head 321 to move because the slurry pressure in the inner pipe 1 is relatively small. The second elastic element 323 maintains the initial pre-tight state, which not only firmly limits the first sliding head 321 and the first sliding column 322 to keep them in place, but also stabilizes the pressure of the pressure-transmitting fluid on the corresponding side of the pressure-transmitting pipe 313.By using the differentiated actions of the two pressure sensing mechanisms 32, the pressure difference between the two ends of the straight pipe section 11 is accurately captured, and then transmitted to the differential pressure switching mechanism 31 through the pressure transmission fluid, providing a reliable basis for the on / off control of the high-pressure water flow path and realizing real-time sensing and acquisition of the pressure at the corresponding end of the straight pipe section 11.

[0035] Here, both the first elastic element 314 and the second elastic element 323 can be compression springs.

[0036] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 6 and Figure 7As shown, the unblocking assembly 4 includes a connecting cylinder 41, a water supply pipe 42, a second sliding head 43, a second sliding column 44, a rotating cylinder 45, a third elastic element 46, and a limiting sealing plate 47. A second sliding hole 121 is provided on the wall of the inner pipe 1, penetrating the wall of the inner pipe 1. A second limiting step surface is provided on the outer wall of the inner pipe 1 corresponding to the position of the second sliding hole 121. The connecting cylinder 41 is fitted and fixed to the second limiting step surface. A clearance hole 411 is provided at the bottom inner side of the connecting cylinder 41, coaxially connected and communicating with the second sliding hole 121. An opening is provided on the limiting sealing plate 47 to communicate with the water supply pipe 42. The limiting seal 47 is sealed and inserted into the top of the connecting cylinder 41; one end of the water supply pipe 42 is connected to the differential pressure valve control assembly 3, and the other end is connected to the top of the connecting cylinder 41 through the opening of the limiting seal 47, for conveying high-pressure water into the connecting cylinder 41; the second sliding head 43 is coaxially and fixedly connected to the second sliding column 44, the second sliding head 43 is disposed inside the connecting cylinder 41 and is sealed and slidingly engaged with the inner wall of the connecting cylinder 41, the second sliding column 44 extends along the direction close to the inner tube 1, and passes through the relief hole 411 and the second sliding hole 121 in sequence; the rotating cylinder 45 is rotatably sleeved on the outer periphery of the second sliding column 44 through the bearing, and rotates... The cylinder 45, the second sliding column 44, and the second sliding head 43 enclose a cavity for the flow and temporary storage of high-pressure water. A through-flow channel 431 is provided inside the second sliding head 43 and the second sliding column 44. One end of the channel 431 penetrates the top surface of the second sliding head 43 and connects to the internal space of the connecting cylinder 41 to receive the high-pressure water supplied by the water supply pipe 42. The other end extends to the corresponding position in the cavity. Multiple water passage holes 441 are evenly spaced along the circumference of the side wall of the second sliding column 44. One end of each water passage hole 441 connects to the channel 431, and the other end connects to the cavity, for channeling the water through the channel. High-pressure water in 431 is introduced into the receiving cavity; the side wall of the rotating cylinder 45 is provided with a cleaning spray slit 451 evenly spaced along the circumference of the rotating cylinder 45, the cleaning spray slit 451 penetrates the side wall of the rotating cylinder 45 radially, and is used to spray the high-pressure water in the receiving cavity to the outer circumference of the rotating cylinder 45 to achieve cleaning; the third elastic member 46 is sleeved on the part of the second sliding column 44 located inside the connecting cylinder 41, one end of the third elastic member 46 abuts against the end face of the second sliding head 43 facing the relief hole 411, and the other end abuts against the inner bottom of the connecting cylinder 41, and is used to provide the second sliding head 43 with a reset elastic force towards the top of the connecting cylinder 41.During use, when the differential pressure valve control assembly 3 opens the high-pressure water flow path, the high-pressure water is delivered to the inside of the connecting cylinder 41 through the openings of the water supply pipe 42 and the limiting seal plate 47. Then, it enters the guide groove 431 between the top surface of the second sliding head 43 and the inside of the second sliding column 44, and flows into the receiving cavity formed between the rotating cylinder 45, the second sliding column 44, and the second sliding head 43 through the water passage 441 on the side wall of the second sliding column 44. The receiving cavity temporarily stores the high-pressure water, allowing the pressure to gradually accumulate. The accumulated high-pressure water exerts a downward thrust on the second sliding head 43, pushing it to slide along the inner wall of the connecting cylinder 41. Simultaneously, it drives the coaxially fixed second sliding column 44 to move closer to the inner tube 1. At least a portion of the second sliding column 44 gradually extends into the inner tube 1. At this time, the third elastic element 46, sleeved on the portion of the second sliding column 44 located inside the connecting cylinder 41, is compressed and stores a reset elastic force. As the second sliding column 44... As the rotating drum 45 moves, it simultaneously extends into the bend section 12 of the inner pipe 1. At the same time, the high-pressure water in the cavity is sprayed radially through the evenly spaced cleaning spray seams 451 on the side wall of the rotating drum 45, forming multiple high-pressure water jets. The high-pressure water jets impact the slurry blockages in the bend section 12, and the reaction force generated by the water jets drives the rotating drum 45 to rotate around the second sliding column 44, achieving all-round flushing and cleaning of the blockages at various locations on the inner wall of the bend section 12. After the blockages in the bend section 12 are completely flushed and cleared, the pressure difference between the two ends of the straight pipe section 11 returns to normal. The pressure difference valve control component 3 cuts off the high-pressure water flow path, the water supply pipe 42 stops supplying high-pressure water to the connecting cylinder 41, and the third elastic element 46 releases the stored reset elastic force, pushing the second sliding head 43 to slide and reset towards the top of the connecting cylinder 41, driving the second sliding column 44 and the rotating drum 45 out of the inner pipe 1 and back to the initial position. The cleaning operation is officially completed, and the grouting operation can continue normally.

[0037] Here, the third elastic element 46 can also be a compression spring.

[0038] In the above embodiments, see Figure 6 As shown, a retaining ring 412 is provided at the bottom inner side of the connecting cylinder 41. The retaining ring 412 is coaxially wrapped around the outer circumference of the rotating cylinder 45. The inner wall of the retaining ring 412 is used to fit against the outer wall of the rotating cylinder 45 when the second sliding head 43 is subjected to the reset elastic force of the third elastic element 46 and drives the rotating cylinder 45 to the initial position, so as to seal the cleaning spray seam 451.

[0039] Understandably, the retaining ring 412 at the bottom inner side of the connecting cylinder 41 coaxially surrounds the outer circumference of the rotating cylinder 45. When the second sliding head 43 is driven by the reset elastic force of the third elastic element 46 to bring the rotating cylinder 45 to its initial position, the inner wall of the retaining ring 412 fits against the outer wall of the rotating cylinder 45, which can accurately seal the cleaning spray joint 451 on the rotating cylinder 45. This effectively prevents the grout from entering the cleaning spray joint 451 and the receiving cavity between the rotating cylinder 45, the second sliding column 44 and the second sliding head 43 during the grouting operation, thus preventing the cleaning spray joint 451, the receiving cavity, the water passage 441 and the guide channel 431 from being blocked or contaminated by the grout. To ensure the structural integrity of each component of the unblocking assembly 4 and its smooth operation during the next unblocking operation, the slurry conveying flow path inside the inner pipe 1 is not affected by the initial structural state of the unblocking assembly 4, maintaining the stability and continuity of the grouting operation; at the same time, the retaining ring 412, through its initial sealing effect on the unblocking spray joint 451, prevents premature leakage from the unblocking spray joint 451 when the high-pressure water pushes the rotating drum 45 to move, ensuring that the thrust generated by the high-pressure water can effectively push the rotating drum 45 into the inner pipe 1, ensuring that the rotating drum 45 can smoothly extend into the inside of the bend section 12 of the inner pipe 1, and ensuring the impact effect of the high-pressure water flow and the effective execution of the unblocking action.

[0040] In the above embodiments, see Figure 7 As shown, the opening of the cleaning spray joint 451 is inclined downward along the direction away from the central axis of the rotating drum 45.

[0041] Understandably, the opening of the unblocking spray nozzle 451 is set at an angle downwards away from the central axis of the rotating drum 45. This precisely matches the characteristic of the slurry in the bend section 12 that tends to accumulate and become clogged below the pipe wall. This allows the high-pressure water flow to directly target and impact the easily clogged areas on the inner wall of the bend section 12, enhancing the flushing force on the deposited slurry. At the same time, in conjunction with the rotation of the rotating drum 45, the downward spray direction can form an all-round flushing trajectory covering the lower part of the inner wall of the bend section 12 and the surrounding area, avoiding dead corners in the unblocking process and improving the thoroughness of the unblocking.

[0042] Here, the cleaning and sealing spray joint 451 is an X-shaped cut.

[0043] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, an optical fiber sensor 5 is installed on the outer wall of the inner tube 1.

[0044] In this embodiment, an optical fiber sensor 5 is installed on the outer wall of the inner pipe 1, enabling precise and real-time auxiliary monitoring of the grouting pipe's operating status. This forms a dual monitoring mechanism with the differential pressure valve control component 3, further improving the accuracy and timeliness of blockage detection. During use, the optical fiber sensor 5 can indirectly reflect the grout flow status and early signs of blockage within the inner pipe 1 based on the correlation mapping between changes in the optical fiber's light transmission characteristics and the grout flow state.

[0045] Here, the fiber optic sensor 5 can be a fiber optic grating sensor or a distributed fiber optic sensing probe.

[0046] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0047] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A self-cleaning grouting pipe, characterized in that, The device includes an inner pipe and an outer pipe. The inner pipe is a slurry conveying pipe, and the outer pipe is sleeved around the outer periphery of the inner pipe, forming a closed cavity filled with high-pressure water. The inner pipe has a straight section and a bend section that are connected to each other. The straight section is located upstream of the bend section along the slurry conveying flow path of the inner pipe. A differential pressure valve control assembly is provided on the straight section, and a blockage removal assembly is provided on the wall of the bend section. The two differential pressure detection ends of the differential pressure valve control assembly are respectively connected to the end of the straight section closer to the bend section and the end of the straight section farther from the bend section. The differential pressure valve control assembly is also connected to the closed cavity and the blockage removal assembly to control the opening and closing of the high-pressure water flow path between the closed cavity and the blockage removal assembly based on the pressure difference between the two ends of the straight section.

2. The self-cleaning grouting pipe according to claim 1, characterized in that, The differential pressure valve control assembly includes a differential pressure opening and closing mechanism and two pressure sensing mechanisms. The two pressure sensing mechanisms are respectively connected to one end of the straight pipe section near the bend and the other end of the straight pipe section away from the bend. The differential pressure opening and closing mechanism is respectively connected to the closed cavity, the unblocking assembly, and the two pressure sensing mechanisms.

3. The self-cleaning grouting pipe according to claim 2, characterized in that, The differential pressure control mechanism includes a valve body, a valve core, and a pressure transmission tube. The two ends of the valve body are respectively connected to the two pressure sensing mechanisms through the pressure transmission tube. The pressure transmission tube is filled with a pressure-transmitting fluid. The valve core is movably disposed within the valve body. The valve body has two oppositely arranged flow holes along its radial direction. The two flow holes are respectively connected to the closed cavity and the unblocking component. The valve core is provided with a guide hole. The guide hole penetrates the valve core along the opposite direction of the two flow holes. The valve core can move under the force of the pressure difference formed by the two pressure sensing mechanisms after being transmitted by the pressure-transmitting fluid, and the valve core can move to the position where the two ends of the guide hole are respectively connected to the two flow holes.

4. The self-cleaning grouting pipe according to claim 3, characterized in that, Both axial sides of the valve core are abutted by a first elastic element, and the end of the first elastic element away from the valve core is abutted by a pressure transmitting block. The pressure transmitting block is in a sealing sliding fit with the inner wall of the valve body. Both ends of the valve body are provided with end caps. The end caps have a channel structure that cooperates with the pressure transmitting pipe and allows the pressure transmitting fluid to flow. The axial inner end face of the end cap is used to abut the end face of the pressure transmitting block facing the end of the valve body to limit the axial sliding stroke of the pressure transmitting block in the valve body.

5. The self-cleaning grouting pipe according to claim 3, characterized in that, The pressure sensing mechanism includes a first sliding head, a first sliding column, a second elastic element, and a positioning element. A first sliding hole is formed on the wall of the inner tube, penetrating the wall of the inner tube. The positioning element is fixedly disposed on the outer wall of the inner tube corresponding to the first sliding hole, and the positioning element has a first limiting step surface. A pipe connector is fitted to the opening of the pressure transmitting tube, and the pipe connector is in contact with the first limiting step surface of the positioning element. The first sliding head is coaxially and fixedly connected to the first sliding column. The first sliding head is embedded in the first sliding hole and slides in a sealed manner with the hole wall of the first sliding hole. The first sliding column extends into the pipe connector in a direction away from the inner tube and slides in a sealed manner with the inner side wall of the pipe connector. The second elastic element is sleeved on the first sliding column, with one end abutting against the first sliding head and the other end abutting against the end face of the pipe connector facing the first sliding hole.

6. The self-cleaning grouting pipe according to claim 1, characterized in that, The unblocking assembly includes a connecting cylinder, a water supply pipe, a second sliding head, a second sliding column, a rotating cylinder, and a third elastic element. A second sliding hole is formed on the wall of the inner pipe, penetrating the inner pipe wall. The connecting cylinder is fixedly positioned on the outer wall of the inner pipe corresponding to the second sliding hole, and a clearance hole is formed at the bottom inner side of the connecting cylinder, coaxially connected and communicating with the second sliding hole. One end of the water supply pipe is connected to the differential pressure valve control assembly, and the other end is connected to the top of the connecting cylinder, for supplying high-pressure water into the connecting cylinder. The second sliding head is coaxially fixedly connected to the second sliding column, and the second sliding head is disposed inside the connecting cylinder and has a sealing sliding fit with the inner wall of the connecting cylinder. The second sliding column extends along the direction close to the inner pipe, passing sequentially through the clearance hole and the second sliding hole. The rotating cylinder is rotatably sleeved on the outer periphery of the second sliding column, and the rotating cylinder, the second sliding column, and the second sliding head together form a cavity for the flow and temporary storage of high-pressure water. The sliding head and the second sliding column have through-flow channels inside. One end of the channel penetrates the top surface of the second sliding head and communicates with the internal space of the connecting cylinder to receive the high-pressure water supplied by the water supply pipe. The other end extends to the corresponding position of the receiving cavity. A water passage hole is provided on the side wall of the second sliding column. One end of the water passage hole communicates with the channel and the other end communicates with the receiving cavity to guide the high-pressure water in the channel into the receiving cavity. The side wall of the rotating cylinder has evenly spaced anti-blocking spray slits along the circumference of the rotating cylinder. The anti-blocking spray slits penetrate the side wall of the rotating cylinder radially to spray the high-pressure water in the receiving cavity towards the outer circumference of the rotating cylinder to achieve anti-blocking. The third elastic element is sleeved on the part of the second sliding column located inside the connecting cylinder. One end of the third elastic element abuts against the end face of the second sliding head facing the clearance hole, and the other end abuts against the inner bottom of the connecting cylinder to provide the second sliding head with a restoring elastic force towards the top of the connecting cylinder.

7. The self-cleaning grouting pipe according to claim 6, characterized in that, The inner bottom of the connecting cylinder is provided with a retaining ring, which is coaxially surrounded around the outer circumference of the rotating cylinder. The inner wall of the retaining ring is used to fit against the outer wall of the rotating cylinder when the second sliding head is subjected to the reset elastic force of the third elastic element and drives the rotating cylinder to the initial position, so as to seal the unclogging spray seam.

8. The self-cleaning grouting pipe according to claim 6, characterized in that, The opening of the unclogging spray joint is inclined downwards in a direction away from the central axis of the rotating drum.

9. The self-cleaning grouting pipe according to claim 1, characterized in that, An optical fiber sensor is installed on the outer wall of the inner tube.

10. A grouting device, characterized in that, Including the self-cleaning grouting pipe as described in any one of claims 1-9.

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