A water-retaining mining grouting and filling device

Abstract

This invention discloses a grouting and filling device for water-retaining mining, relating to the field of mining technology. It includes a grouting head, which is detachably connected to a grouting pipe via a docking unit. The docking unit includes a connector and a butt joint, respectively located at opposite ends of the grouting head and the grouting pipe. The connector has mounting grooves arranged in a ring array on its circumferential surface. A chuck is rotatably connected to the mounting groove via a pin, and the end of the chuck has a locking head with a beveled surface. A sealing unit is provided on the docking head, including a drive shaft that passes through a through hole in the docking head. A sealing disc is slidably mounted on the drive shaft. This invention features a detachable grouting section, leaving the grouting pipe inside the borehole after grouting, preventing disturbance to the filled grout and the initially formed filling material. Furthermore, the grouting section can actively separate and self-seal after grouting, enhancing the sealing performance of the annular space.

Description

Technical Field

[0001] This invention relates to the field of mining technology, specifically to a grouting and filling device for water-conserving mining. Background Technology

[0002] Water-conserving mining is one of the core technologies for green coal mining in my country. Its core objective is to avoid or reduce damage to underground aquifer structures, block water channels, and prevent mine water hazards and groundwater loss through engineering means during coal mining. Grouting is the core process of water-conserving mining. By injecting filling grout into the goaf and water-conducting fracture zone, a dense filling body and water-proof curtain are formed, which repairs the damaged water-proof layer and blocks the hydraulic connection between the aquifer and the mining area.

[0003] Chinese patent application number 202511146367.9 discloses a grouting and filling device for water-retaining mining in coal mines, relating to the field of mining equipment technology. This grouting and filling device includes a base frame, a grouting conduit, a slurry post-processing assembly, and a insertion / removal drive assembly. The outer wall of the grouting conduit is provided with multiple sets of outer ring sections equipped with perforated wall pressure sensors, and a pipe-end micro-sensor is configured at the slurry outlet end. The insertion / removal drive assembly uses a motor to drive a toggle assembly to push the outer ring section, controlling the insertion and removal of the grouting conduit. However, the grouting section is a fixed, integrated structure design. After the grouting operation is completed, the entire grouting section needs to be pulled out of the borehole. During the pipe-pulling operation, it is very easy to cause mechanical disturbance to the initially solidified filling slurry and the newly formed filling material inside the borehole, leading to secondary cracks in the filling material.

[0004] In addition, although some existing grouting equipment uses a detachable connection structure for the grouting part, it cannot automatically detach after grouting is completed. Operators still need to manually disassemble it at close range, which poses a high safety risk for downhole operations. Furthermore, most existing grouting and filling equipment use fixed-size rubber plugs to statically seal the annular space gap between the grouting pipe and the borehole. This cannot adaptively adjust the sealing effect according to changes in grouting pressure, which easily leads to the problem of grout leaking outward along the annular space gap. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a grouting and filling device for water-conserving mining. The grouting part adopts a detachable structure. After grouting is completed, the grouting pipe is left in the borehole to avoid disturbing the grout and the initially formed filling body. Moreover, the grouting part can achieve active separation and self-sealing after grouting is completed, which reduces safety risks. Furthermore, the sealing effect on the annular space gap increases with the increase of grouting pressure, which enhances the sealing performance of the annular space gap and can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a water-conserving mining grouting and filling device, comprising a grouting head, wherein the grouting head is detachably connected to a grouting pipe via a docking unit; The docking unit includes: The connector and the butt joint are respectively located at opposite ends of the grouting head and the grouting pipe. The circumferential surface of the connector is provided with mounting grooves in a ring array. The mounting grooves are rotatably connected to the claws by a pin. The end of the claws is provided with a clamping head, and the end of the clamping head is provided with an inclined surface. The mating head is provided with a sealing unit, the sealing unit comprising: A drive shaft passes through a through hole in the mating head, and a sealing disc is slidably sleeved on the drive shaft; The connector is provided with a sealing unit, the sealing unit comprising: The annular seat is fixedly sleeved on the mating head. The annular seat has a hollow structure and a through groove is opened through the circumference of the annular seat. A sealing seat is embedded in the through groove. A limiting plate is provided inside the annular seat, and a guide rod slides through the limiting plate. A fixed wedge seat is provided at the end of the guide rod away from the sealing seat. A sliding rod passes through both sides of the annular seat, and a movable wedge seat corresponding to and cooperating with the fixed wedge seat is fixedly sleeved on the sliding rod.

[0007] Preferably, the input end of the grouting head is provided with a slide block, and a U-shaped slide rail is slidably connected to the outside of the slide block. An electric telescopic rod is provided at the bottom of the slide rail, and the telescopic end of the electric telescopic rod is fixedly connected to the slide block. The slide is equipped with a feed pipe that is connected to the grouting pipe.

[0008] Preferably, the end of the slide rail seat is rotatably connected to a support rod via a rotating shaft, and the bottom end of the support rod is provided with a base; The support rod is provided with a support, and a guide wheel that matches the feed pipe is rotatably connected to the support. The support rod is provided with a belt drive mechanism for driving the rotating shaft to rotate.

[0009] Preferably, a torsion spring is sleeved on the pin, and the two ends of the torsion spring are fixedly connected to the mounting groove and the side of the claw, respectively.

[0010] Preferably, the docking unit further includes slots, which are arranged in a circumferential array on the circumferential surface of the docking head, and the slots and the head are correspondingly engaged.

[0011] Preferably, the docking unit further includes a reset rod that slides through the side of the connector head. A reset spring is sleeved on the reset rod, and the two ends of the reset spring are fixedly connected to the end of the reset rod and the connector head, respectively.

[0012] Preferably, the sealing disc corresponds to and fits into the inner hole of the connector; The drive shaft has a protrusion on its side wall, a spiral groove that mates with the protrusion is opened on the inner wall of the through hole, and a limit spring is sleeved on the outer end of the drive shaft.

[0013] Preferably, one end of the guide rod abuts against the inner circumferential surface of the sealing seat, and the sealing seat is made of an elastic material; The end of the slide rod away from the connector is provided with a drive ring, which slides in engagement with the connector. The other end of the slide rod is in engagement with the beveled surface of the end of the clamp.

[0014] Compared with the prior art, the present invention has the following effects: 1. This invention achieves detachable and quick docking and locking of the grouting head and grouting pipe, as well as pressure-triggered automatic disengagement, through a docking unit. During docking, the axial feed of the connector and the mating head can achieve quick locking without fasteners through the cooperation of the claws and slots. The return spring continuously pushes the mating head through the return rod to avoid loosening of the connection due to grouting pressure impact. When the grouting pressure reaches the threshold, it can automatically trigger unlocking and separation, so that the grouting pipe is permanently left in the borehole, avoiding disturbance to the filling body when the pipe is pulled out, and improving the grouting effect of water-retaining mining. 2. This invention achieves adaptive dynamic sealing of the borehole annular space gap through the sealing unit. After the grouting pipe enters the hole, the elastic sealing seat forms an interference fit with the inner wall of the borehole to complete the initial sealing and prevent grout from overflowing. During the grouting process, the grout pressure drives the slide rod to slide axially, which is converted into radial thrust through the cooperation of the moving wedge seat and the fixed wedge seat, causing the sealing seat to expand radially. The sealing fit and the friction of the inner wall of the borehole increase synchronously with the grouting pressure, effectively preventing the grouting pipe from slipping and ensuring the stability and safety of high-pressure grouting operations. 3. This invention achieves automatic opening and closing of the grouting pipe channel and anti-backflow sealing through a sealing unit. In the initial state, the sealing disc is in a closed state. When the connection is locked, the clamping head synchronously pushes against the drive shaft. Through the cooperation of the protrusion and the spiral groove, the sealing disc is driven to rotate to open, ensuring that the grouting channel is unobstructed. When the grouting head is separated from the grouting pipe, the limit spring resets and drives the sealing disc to return to its position and close synchronously, automatically sealing the inner hole of the grouting pipe and preventing the grout from flowing back and causing filling failure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the axial structure of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a schematic cross-sectional view of the connector structure of the present invention; Figure 5 This is a schematic cross-sectional view of the joint structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 8 This is a schematic cross-sectional view of the connector and mating head of the present invention.

[0016] In the diagram: 1. Grouting head; 101. Slide rail seat; 102. Slide seat; 103. Electric telescopic rod; 104. Feed pipe; 105. Rotating shaft; 106. Support rod; 107. Support; 108. Guide wheel; 109. Belt drive mechanism; 110. Base; 2. Grouting pipe; 3. Docking unit; 301. Connector; 302. Butt joint; 303. Mounting groove; 304. Pin; 305. Claw; 306. Torsion spring; 307. 308. Clamping head; 310. Clamping groove; 311. Reset rod; 312. Reset spring; 4. Sealing unit; 401. Drive shaft; 402. Sealing disc; 403. Protrusion; 404. Spiral groove; 405. Limiting spring; 5. Sealing unit; 501. Annular seat; 502. Sealing seat; 503. Limiting plate; 504. Guide rod; 505. Fixed wedge seat; 506. Slide rod; 507. Moving wedge seat; 508. Drive ring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Please see Figure 1-8 The present invention provides a technical solution: a water-retaining mining grouting and filling device, including a grouting head 1, the grouting head 1 being detachably connected to a grouting pipe 2 via a docking unit 3, the input end of the grouting head 1 being provided with a slide seat 102, the slide seat 102 being slidably connected to a U-shaped slide rail seat 101, the bottom of the slide rail seat 101 being provided with an electric telescopic rod 103, the telescopic end of the electric telescopic rod 103 being fixedly connected to the slide seat 102, and the slide seat 102 being provided with a feeding pipe 104 communicating with the grouting pipe 2.

[0019] Furthermore, the feed pipe 104 is connected to an external grout supply system. After the grouting pipe 2 is inserted into the borehole, the grout enters the grouting head 1 through the feed pipe 104 and is sent into the grouting pipe 2 through the docking unit 3. The grout can then be sent into the cracks in the borehole through the grouting pipe 2. The extension and retraction drive slide 102 of the electric telescopic rod 103 slides linearly along the slide rail seat 101 to realize the extension and retraction of the grouting pipe 2.

[0020] The end of the slide rail seat 101 is rotatably connected to a support rod 106 via a rotating shaft 105. The bottom end of the support rod 106 is provided with a base 110. A support 107 is provided on the support rod 106. A guide wheel 108 matching the feed pipe 104 is rotatably connected to the support 107. A belt drive mechanism 109 for driving the rotating shaft 105 to rotate is provided on the support rod 106.

[0021] Furthermore, the belt drive mechanism 109 is a mature existing technology and will not be described in detail. The belt drive mechanism 109 drives the rotating shaft 105 to rotate the slide rail seat 101, thereby realizing the adjustment of the angle of the grouting pipe 2. The guide wheel 108 is configured to provide support and guidance for the feed pipe 104 as it extends and retracts with the grouting pipe 2.

[0022] The docking unit 3 includes a connector 301 and a mating head 302. The connector 301 and the mating head 302 are respectively located at opposite ends of the grouting head 1 and the grouting pipe 2. The circumferential surface of the connector 301 is provided with mounting grooves 303 in an annular array. A claw 305 is rotatably connected to the mounting groove 303 through a pin 304. A torsion spring 306 is sleeved on the pin 304. The two ends of the torsion spring 306 are fixedly connected to the sides of the mounting groove 303 and the claw 305, respectively. The end of the claw 305 is provided with a clamping head 307. The end of the clamping head 307 is provided with an inclined surface 308.

[0023] The docking unit 3 also includes a slot 310, which is arranged in a circular array on the circumferential surface of the docking head 302. The slot 310 and the head 307 are correspondingly engaged.

[0024] Furthermore, in the initial state, the torsion spring 306 is not twisted, and the locking heads 307 at the ends of each claw 305 are in a closed state. When the connector 301 and the mating head 302 are mated, the mating head 302 gradually moves closer to the connector 301. The edge of the slot 310 first abuts against the inclined surface 308 at the end of the locking head 307, so that each claw 305 opens outward synchronously under the drive of the mating head 302. At the same time, the torsion spring 306 undergoes elastic torsion. When the locking head 307 has completely passed through the slot 310, the torsion spring 306 quickly returns to its original position, so that each locking head 307 closes synchronously. The protruding part of the locking head 307 is engaged with the outer end face of the slot 310, that is, the inner plane of the protruding part is in contact with the outer end face of the mating head 302, realizing the connection limit between the connector 301 and the mating head 302. In order to enhance the sealing of the connection, a sealing gasket is provided on the mating end face of the mating head 302.

[0025] The docking unit 3 also includes a reset rod 311, which slides through the side of the connector 301. A reset spring 312 is sleeved on the reset rod 311, and the two ends of the reset spring 312 are fixedly connected to the end of the reset rod 311 and the connector 301, respectively.

[0026] Furthermore, in the initial state, the reset rod 311 extends through the front end of the connector 301. During the docking process between the connector 301 and the mating head 302, the end face of the mating head 302 pushes the reset rod 311 to move in the opposite direction. At this time, the reset spring 312 is stretched and in an energy storage state. After the connector 301 and the mating head 302 are fully docked, the end face of the reset rod 311 is flush with the end face of the connector 301. At the same time, the energy stored in the stretched reset spring 312 makes the reset rod 311 always press against the end face of the mating head 302, generating a pressing force, so that the outer end face of the mating head 302 is tightly fitted with the inner side of the clamp 307.

[0027] The connector 302 is provided with a sealing unit 5. The sealing unit 5 includes an annular seat 501, which is fixedly sleeved on the connector 302. The annular seat 501 has a hollow structure. A through groove is opened through the circumference of the annular seat 501. The sealing seat 502 is embedded in the through groove and is made of elastic material.

[0028] Furthermore, the sealing seat 502 is movable with the through groove. The outer diameter of the sealing seat 502 is slightly larger than the diameter of the borehole. After the grouting pipe 2 is sent into the borehole, the sealing seat 502 fits against the inner wall of the outer end of the borehole. The sealing seat 502 and the borehole are interference fit to achieve sealing of the outer end of the borehole and prevent the grout from overflowing through the annular space gap between the grouting pipe 2 and the borehole during the grouting process.

[0029] It also includes a limiting plate 503, which is located inside the annular seat 501. A guide rod 504 slides through the limiting plate 503. One end of the guide rod 504 abuts against the inner circumferential surface of the sealing seat 502. A fixed wedge seat 505 is provided at the end of the guide rod 504 away from the sealing seat 502. It also includes a sliding rod 506, which passes through both sides of the annular seat 501. A movable wedge seat 507 corresponding to the fixed wedge seat 505 is fixedly sleeved on the sliding rod 506. A drive ring 508 is provided at the end of the sliding rod 506 away from the connector 301. The drive ring 508 slides with the connector 302. The other end of the sliding rod 506 corresponds to the inclined surface 308 at the end of the clamp 307.

[0030] Furthermore, after the grout enters the annular space gap, it will generate a squeezing force on the drive ring 508, and the squeezing force is transmitted to the slide rod 506, causing the slide rod 506 to slide linearly. At the same time, the moving wedge seat 507 on the slide rod 506 simultaneously squeezes the fixed wedge seat 505. The fixed wedge seat 505 pushes the guide rod 504 to apply a squeezing force to the inner wall of the sealing seat 502, thereby making the outer wall of the sealing seat 502 fit tightly with the inner wall of the borehole, preventing the pressure in the annular space gap from being too high and causing the grouting pipe 2 to slide to the outside of the borehole.

[0031] More specifically, such as Figure 7 As shown, the cross-sections of the fixed wedge seat 505 and the moving wedge seat 507 are right-angled trapezoidal structures. When the pressure in the annular space gap increases rapidly and reaches the set pressure threshold, it indicates that the crack in the borehole is completely filled with slurry, the sliding distance of the guide rod 504 reaches its maximum, and at the same time, the relative horizontal surfaces between the fixed wedge seat 505 and the moving wedge seat 507 begin to contact. At this time, the sliding resistance between the fixed wedge seat 505 and the moving wedge seat 507 decreases, and the slide rod 506 slides rapidly towards the end of the connector 302 under the drive of the drive ring 508. Since the slide rod 506 corresponds to the inclined surface 308 at the end of the chuck 307, the slide rods 506 at each position will synchronously abut and squeeze each inclined surface 308, causing each chuck 307 to synchronously open outward, releasing the limit between the connector 301 and the connector 302. At the same time, the stretched return spring 312 quickly contracts and resets, and the connector 301 and the connector 302 are quickly separated by the return rod 311.

[0032] In use, the belt drive mechanism 109 drives the rotating shaft 105 to rotate, and the rotating shaft 105 drives the slide rail seat 101 to rotate synchronously around the end of the support rod 106. The support rod 106 achieves fixed support at the work site through the base 110 at the bottom end, thereby adjusting the pitch angle of the slide rail seat 101 and the grouting pipe 2 until the axis of the grouting pipe 2 is coaxially coincident with the axis of the borehole to be grouted, thus completing the attitude pre-adjustment before the grouting operation.

[0033] The feed pipe 104 is connected to the external slurry supply system. The guide wheel 108, which is rotatably mounted on the support 107 fixed on the support rod 106, provides support and guidance for the feed pipe 104, avoiding bending, dragging and jamming of the feed pipe 104 during the feeding and retraction of the grouting pipe 2.

[0034] During grouting operations, the telescopic end of the electric telescopic rod 103 extends, driving the slide block 102 to slide linearly along the inner wall of the slide rail seat 101. The slide block 102 simultaneously drives the grouting head 1, the docking unit 3, and the grouting pipe 2 to axially advance into the borehole, pushing the grouting pipe 2 to the set grouting depth in the borehole, thus completing the preparation work for grouting.

[0035] In the initial state, the torsion spring 306 does not undergo elastic torsion, and the claws 305 distributed in the ring array remain closed under the limit of the torsion spring 306, with the locking head 307 at the end of each claw 305 in a radially closed position.

[0036] During the docking operation, the mating head 302 and the connector head 301 are aligned coaxially, and the mating head 302 is moved axially toward the connector head 301. The edge of the slot 310 first abuts against the inclined surface 308 at the end of the clamp head 307. As the mating head 302 continues to feed, the axial thrust on the inclined surface 308 is converted into a radial force that causes the jaws 305 to open outward around the pin 304, and drives each jaw 305 to open outward synchronously. At the same time, the torsion spring 306 undergoes elastic torsion and stores elastic potential energy.

[0037] When the clamp 307 completely passes the slot 310, the elastic potential energy stored in the torsion spring 306 is released, causing each clamp 305 to rotate synchronously in the opposite direction around the pin 304 to reset, so that each clamp 307 synchronously closes radially. The protruding part of the clamp 307 is inserted into the outer end of the slot 310, and the inner plane of the clamp 307 is tightly fitted with the outer end face of the connector 302, realizing the axial limiting and locking of the connector 301 and the connector 302, and completing the fixed connection between the grouting head 1 and the grouting pipe 2.

[0038] During the docking process between connector 301 and mating head 302, the end face of mating head 302 first abuts against the extended end of reset rod 311. As mating head 302 continues to feed axially, mating head 302 pushes reset rod 311 to slide in the opposite direction along the radial through hole of connector 301. At the same time, reset spring 312 is stretched and stores elastic potential energy.

[0039] After the connector 301 and the mating head 302 are locked together, the inner end face of the reset rod 311 is flush with the mating end face of the connector 301. The elastic potential energy stored in the reset spring 312 continues to act on the reset rod 311, so that the reset rod 311 always applies an axial reverse thrust to the end face of the mating head 302, so that the outer end face of the mating head 302 and the inner side plane of the clamp 307 are kept in close contact, improving the stability and sealing of the mating connection, and avoiding the problem of loosening of the connection due to the impact of grout pressure during the grouting process.

[0040] The detachable connection between connector 301 and butt joint 302 allows the grouting pipe 2 to remain inside the borehole after grouting is completed. Traditional grouting requires pipe removal after completion, which can easily disturb the formed grout filling body. The detachable connection allows the grouting pipe 2 to be permanently left inside the borehole without being pulled out, completely avoiding damage to the filling body caused by pipe removal. This ensures the integrity and continuity of the waterproof curtain. Furthermore, the retained grouting pipe 2 can maintain pressure throughout the grout solidification process, avoiding the loss of grouting pressure caused by pipe removal. This allows the grout to fully penetrate the water-conducting micro-fractures, ensuring the repair effect of the waterproof layer.

[0041] After the grouting pipe 2 is pushed into the borehole to a set depth, the sealing seat 502 fits against the inner wall of the outer end of the borehole. The outer diameter of the sealing seat 502 is larger than the inner diameter of the borehole, so that the sealing seat 502 and the inner wall of the borehole form an interference fit, thereby achieving the initial sealing of the annular space gap between the outer end of the borehole and the outer wall of the grouting pipe 2, preventing the grout from overflowing outward from the annular space gap during the grouting process, and ensuring the stability of the grouting pressure.

[0042] During the grouting operation, the external grout supply system delivers the filling grout into the grouting head 1 through the feed pipe 104. The grout enters the grouting pipe 2 through the internal flow channel of the docking unit 3, and is finally injected into the borehole through the grouting pipe 2. The grout first fills the annular space between the grouting pipe 2 and the borehole, and then fills the various fissures in the borehole under the pressure of the grout, thus realizing the grouting and filling for water-retaining mining.

[0043] When the grout seeps into the annular space between the grouting pipe 2 and the borehole, the grout pressure acts on the end face of the drive ring 508, generating an axial compressive force on the drive ring 508. This compressive force is transmitted through the drive ring 508 to the slide rod 506 and causes the slide rod 506 to slide axially.

[0044] During the sliding process of the slide rod 506, the moving wedge seat 507 moves axially synchronously. The wedge-shaped surface of the moving wedge seat 507 and the wedge-shaped surface of the fixed wedge seat 505 are pressed and engaged, converting the axial movement of the slide rod 506 into the radial movement of the fixed wedge seat 505. The fixed wedge seat 505 pushes the inner circumferential surface of the sealing seat 502 through the guide rod 504, thereby causing the elastic sealing seat 502 to undergo radial expansion deformation, further increasing the tightness of the fit and contact pressure between the sealing seat 502 and the inner wall of the borehole. This allows the sealing performance between the sealing seat 502 and the inner wall of the borehole to improve adaptively as the grouting pressure increases. At the same time, the friction between the sealing seat 502 and the inner wall of the borehole increases synchronously with the contact pressure, effectively preventing the grouting pipe 2 from slipping out of the borehole due to excessive grouting pressure during the grouting process, and improving the stability of the grouting operation.

[0045] Once the target fracture in the borehole is completely filled with grout, the grouting pressure in the annular space continues to rise to the set pressure threshold. At this point, the sliding distance of the slide rod 506 reaches its maximum value, and the horizontal straight edge of the right-angled trapezoidal cross-section of the moving wedge seat 507 and the fixed wedge seat 505 comes into contact. The wedge-shaped surface compression between the moving wedge seat 507 and the fixed wedge seat 505 is released, and the sliding resistance between them is greatly reduced. The grout pressure in the annular space continues to push the drive ring 508 and the slide rod 506 to slide rapidly axially, causing the end of the slide rod 506 to abut against the inclined surface 308 at the end of the chuck 307. The axial thrust of the slide rod 506 is converted into a radial force through the inclined surface 308, causing the chuck 307 to open outward, driving each chuck 305 to open outward synchronously, causing the chuck 307 to disengage from the chuck groove 310, and releasing the axial locking limit between the connector 301 and the mating joint 302.

[0046] At this time, the stretched return spring 312 quickly contracts and resets, and applies axial thrust to the connector 302 through the return rod 311, so that the connector 301 and the connector 302 quickly separate axially, realizing the automatic separation of the grouting head 1 and the grouting pipe 2 after the grouting is completed, improving the efficiency and safety of the grouting operation.

[0047] It should be noted that after the connection between the connector 301 and the mating connector 302 is released by the drive of the slide rod 506, the horizontal straight edge of the right-angled trapezoidal cross-section of the moving wedge seat 507 and the fixed wedge seat 505 remains in continuous contact to prevent the expanded sealing seat 502 from shrinking and resetting, thereby reducing the sealing effect on the annular space gap.

[0048] Example 2: However, when the grouting direction is upward or obliquely upward, after the connector 301 separates from the butt joint 302, the grout in the grouting pipe 2 will flow back out, and the grout filling the crack will also be discharged, causing the filling to fail. Therefore, the following improvements are made: Please see Figure 5 and Figure 6 The connector 302 is provided with a sealing unit 4, which includes a drive shaft 401. The drive shaft 401 passes through a through hole opened on the connector 302. The side wall of the drive shaft 401 is provided with a protrusion 403. The inner wall of the through hole is provided with a spiral groove 404 that cooperates with the protrusion 403. The outer end of the drive shaft 401 is fitted with a limiting spring 405.

[0049] A sealing disc 402 is slidably sleeved on the drive shaft 401, and the sealing disc 402 is correspondingly engaged with the inner hole of the connector 302.

[0050] Furthermore, in the initial state, the sealing disc 402 is parallel to the end face of the connector 302, the inside of the connector 302 is sealed, and the drive shaft 401 corresponds to one of the slots 310. When the clamp 307 completely passes through the slot 310 and is inserted into the outer end face of the slot 310, the side of the clamp 307 facing the central axis of the grouting pipe 2 will push the drive shaft 401 to slide radially along the through hole. The limiting spring 405 is compressed, and the drive shaft 401 is rotated synchronously by the cooperation of the protrusion 403 and the spiral groove 404.

[0051] Since the drive shaft 401 and the sealing disc 402 are slidably connected and the sealing discs 402 cannot rotate relative to each other, the drive shaft 401 rotates while the sealing disc 402 rotates. The return elastic force of the torsion spring 306 is sufficient to overcome the elastic resistance of the limit spring 405. After the clamping head 307 completes the engagement, the rotation angle of the sealing disc 402 is set to 90 degrees. At this time, the end face of the sealing disc 402 and the butt joint 302 are perpendicular to each other, and the opening of the sealing disc 402 reaches its maximum, so that the grouting work can proceed smoothly.

[0052] Therefore, as the connector 301 and the mating head 302 separate, the clamp 307 releases the resistance force on the drive shaft 401, and the compressed limit spring 405 drives the drive shaft 401 to reset, while simultaneously driving the sealing disc 402 to reset to its initial sealing state, preventing the grout in the grouting pipe 2 from flowing out in reverse after the connector 301 and the mating head 302 separate. After the sealing disc 402 resets, the drive shaft 401 is locked by the nut to prevent the rotation of the drive shaft 401 from causing the sealing disc 402 to deflect and resulting in grout leakage.

[0053] It should be noted that since the drive shaft 401 and the slide bar 506 have different positions on the chuck 307, the drive shaft 401 will not interfere with the slide bar 506 at the corresponding position during the reset process.

[0054] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A water-retaining mining grouting and filling device, comprising a grouting head (1), characterized in that, The grouting head (1) is detachably connected to the grouting pipe (2) via the docking unit (3); The docking unit (3) includes: The connector (301) and the butt joint (302) are respectively located at opposite ends of the grouting head (1) and the grouting pipe (2). The circumferential surface of the connector (301) is provided with mounting grooves (303) arranged in a ring array. The mounting groove (303) is rotatably connected to the claw (305) through the pin (304). The end of the claw (305) is provided with a clamping head (307). The end of the clamping head (307) is provided with an inclined surface (308). The connector (302) is provided with a sealing unit (4), the sealing unit (4) comprising: A drive shaft (401) passes through a through hole in the connector (302), and a sealing disc (402) is slidably sleeved on the drive shaft (401). The connector (302) is provided with a sealing unit (5), the sealing unit (5) comprising: The annular seat (501) is fixedly sleeved on the connector (302). The annular seat (501) has a hollow structure. A through groove is opened through the circumference of the annular seat (501), and a sealing seat (502) is embedded in the through groove. A limiting plate (503) is provided inside the annular seat (501). A guide rod (504) slides through the limiting plate (503). A fixed wedge seat (505) is provided at the end of the guide rod (504) away from the sealing seat (502). The slide rod (506) passes through both sides of the annular seat (501), and a movable wedge seat (507) corresponding to the fixed wedge seat (505) is fixedly sleeved on the slide rod (506).

2. The water-retaining mining grouting and filling device according to claim 1, characterized in that: The grouting head (1) has a slide block (102) at its input end. A U-shaped slide rail seat (101) is slidably connected to the outside of the slide block (102). An electric telescopic rod (103) is provided at the bottom of the slide rail seat (101). The telescopic end of the electric telescopic rod (103) is fixedly connected to the slide block (102). The slide (102) is provided with a feed pipe (104) that is connected to the grouting pipe (2).

3. The water-retaining mining grouting and filling device according to claim 2, characterized in that: The end of the slide rail seat (101) is rotatably connected to a support rod (106) via a rotating shaft (105), and the bottom end of the support rod (106) is provided with a base (110). The support rod (106) is provided with a support (107), and a guide wheel (108) matching the feed pipe (104) is rotatably connected to the support (107). The support rod (106) is provided with a belt drive mechanism (109) for driving the rotating shaft (105) to rotate.

4. The water-retaining mining grouting and filling device according to claim 1, characterized in that: A torsion spring (306) is sleeved on the pin (304), and the two ends of the torsion spring (306) are fixedly connected to the side of the mounting groove (303) and the claw (305), respectively.

5. The water-retaining mining grouting and filling device according to claim 1, characterized in that: The docking unit (3) also includes a slot (310), which is arranged in a circular array on the circumferential surface of the docking head (302). The slot (310) and the head (307) are correspondingly engaged.

6. The water-retaining mining grouting and filling device according to claim 1, characterized in that: The docking unit (3) also includes a reset rod (311), which slides through the side of the connector (301). A reset spring (312) is sleeved on the reset rod (311), and the two ends of the reset spring (312) are fixedly connected to the end of the reset rod (311) and the connector (301) respectively.

7. The water-retaining mining grouting and filling device according to claim 1, characterized in that: The sealing disc (402) is fitted with the inner hole of the connector (302); The drive shaft (401) has a protrusion (403) on its side wall, and a spiral groove (404) that mates with the protrusion (403) is opened on the inner wall of the through hole. A limiting spring (405) is sleeved on the outer end of the drive shaft (401).

8. The water-retaining mining grouting and filling device according to claim 1, characterized in that: One end of the guide rod (504) abuts against the inner circumferential surface of the sealing seat (502), which is made of elastic material; the end of the slide rod (506) away from the connector (301) is provided with a drive ring (508), which slides with the connector (302), and the other end of the slide rod (506) is correspondingly engaged with the inclined surface (308) at the end of the clamp (307).

Images