Split type filling hydraulic support and working face stoping and filling parallel operation method

Abstract

The invention provides a split type filling hydraulic support and a working face stoping and filling parallel operation method, and relates to the technical field of mine equipment. According to the split type filling hydraulic support and the working face stoping and filling parallel operation method, a stoping and filling process of four mining and one filling is adopted, a rear base is kept static during paste filling, a pushing hydraulic cylinder can drive a front base to move forwards by three times of the coal mining step pitch relative to the rear base, three-knife coal cutting can be achieved, and the working face stoping and filling parallel operation is achieved. After the paste is solidified, the rear base (filling the isolation frame body) can be pulled to cut coal for the fourth and fifth knives; in the paste filling period, the front frame body formed by the front base and the top beam of the front base carries out front-frame stoping operation in parallel, and the space between the front frame body and the filling isolation frame body carries out supporting operation in parallel, so that anchor rod supporting is carried out on a working face top plate, parallel operation of filling, stoping and supporting is achieved, the stoping operation time can be greatly prolonged, and the working efficiency is improved. And the stoping and filling operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of mining equipment technology, specifically to a split-type filling hydraulic support and a method for parallel operation of backfilling and mining in the working face. Background Technology

[0002] Traditional paste-filling hydraulic supports typically have a rigid connection between the front support section used for longwall mining and the rear support section used for filling and isolation. This creates a conflict between mining and filling operations, making them only suitable for alternating mining and filling operations. During the solidification of the paste, the rear support section cannot move, preventing the front support section from advancing coal. Therefore, using traditional paste-filling hydraulic supports necessitates a "two-step mining, one-step filling" longwall mining and filling process, resulting in reduced mining time, low isolation efficiency, and high costs.

[0003] Therefore, the filling hydraulic support is designed as a split structure, allowing the front frame to move relative to the rear frame. This enables the front frame to advance during the solidification of the paste, thereby optimizing the backfilling process, increasing coal mining operation time, improving isolation efficiency, and reducing costs.

[0004] During the development of a novel split-type filling hydraulic support, the applicant's R&D team discovered that conventional split-type filling hydraulic supports are difficult to adapt to the actual working conditions of the longwall face. For example, the floor of the longwall face is uneven along the strike and dip of the face, and may even have a significant slope. The sliding section between the front and rear sections of conventional split-type filling hydraulic supports cannot adapt to the conditions of the longwall face floor. To achieve large-step sliding, the sliding section is prone to breakage, and the rear section may even risk tipping over when the strike or dip angle is large. Furthermore, the filling isolation height adjustment of the rear section of conventional split-type filling hydraulic supports is not flexible enough, failing to adapt well to different filling heights, and the stability of the support for the filling paste during the solidification process needs improvement. In conventional split-type hydraulic filling supports, when the working face roof is soft or fractured, the initial supporting force of the upper telescopic hydraulic cylinder decreases, creating a gap between the upper isolator and the roof. This damages the space where the filling paste is sealed, causing the paste to overflow from the gap. The rear support section, under the pressure of the unsolidified flowing paste, is prone to forward movement, leading to the collapse of the unsolidified filling material. The paste inside the filling material overflows from the support structure and flows into the pedestrian walkway. This not only increases the paste solidification time and affects filling efficiency, but the overflowing paste can also bury the hydraulic and electrical control components on the rear support section, making cleanup extremely difficult and potentially causing damage to the rear support section. Summary of the Invention

[0005] The purpose of this invention is to provide a split-type hydraulic support for filling and a parallel operation method for backfilling in the working face, so as to adapt to the actual working conditions of the backfilling face and improve the efficiency of backfilling operations.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A split-type filling hydraulic support, comprising: Front base; The top beam is located above the front base. The top beam is connected to the front base via a hydraulic column, and the top beam is also connected to the front base via an inclined beam. The telescopic beam is located at the rear end of the top beam. The telescopic beam extends backward in a horizontal direction and can expand and contract relative to the top beam. Rear base; The front base and the rear base are connected by a push-adaptive mechanism; The upper isolator slides onto the rear base, allowing the upper isolator to move vertically relative to the rear base; The lower isolator slides onto the rear base, allowing the lower isolator to move vertically relative to the rear base. The upper and lower isolation bodies are stacked along the front and rear directions; The first hydraulic cylinder extends and retracts relative to the cylinder body end to drive the upper isolator to move vertically relative to the rear base. The second hydraulic cylinder extends and retracts relative to the cylinder body end to drive the lower isolator to move vertically relative to the rear base.

[0007] Furthermore, the adaptive pushing mechanism includes a first hinge assembly, a pushing hydraulic cylinder, a second hinge assembly, a sliding support, and a tongue plate; The first hinge assembly is mounted on the rear end of the front base; The telescopic end of the pushing hydraulic cylinder is connected to the first hinge assembly, and the cylinder body end of the pushing hydraulic cylinder is provided with a third hinge assembly, which is hinged to the base. The telescopic end of the push hydraulic cylinder can swing relative to the front base in the left, right and up and down directions, and the cylinder body end of the push hydraulic cylinder can swing relative to the rear base in the up and down direction. The second hinge assembly is mounted at the rear end of the front base; The sliding support is located on the rear base and extends along the front and rear directions of the rear base. The tongue plate slides in conjunction with the sliding support, and the front end of the tongue plate is connected to the second hinge assembly. The front end of the tongue plate can swing relative to the front base in the left, right, up, and down directions. In this case, the direction of extension and retraction of the telescopic end of the push hydraulic cylinder relative to the cylinder body end is parallel to the direction of sliding of the tongue plate relative to the sliding support.

[0008] Furthermore, the first hinge assembly includes a first mounting base and a first swing base. The first mounting base is disposed at the rear end of the front base. The first swing base is hinged to the first mounting base and can swing relative to the first mounting base in the left and right directions. The telescopic end of the push hydraulic cylinder is hinged to the first swing base and can swing relative to the first swing base in the up and down directions.

[0009] Furthermore, the second hinge assembly includes a second mounting base and a second swing base. The second mounting base is disposed at the rear end of the front base. The second swing base is hinged to the second mounting base. The second swing base can swing relative to the second mounting base in the up and down direction. The front end of the tongue plate is hinged to the second swing base. The front end of the tongue plate can swing relative to the second swing base in the left and right direction.

[0010] Furthermore, the second swing seat is provided with at least one first limiting hole, and the front end of the tongue plate is provided with a second limiting hole corresponding to the first limiting hole. The first limiting hole and the second limiting hole can cooperate with a limiting pin.

[0011] Furthermore, the sliding support is configured as a hollow structure, and the tongue plate is located inside the sliding support; The inner contour of the sliding support matches the outer contour of the tongue plate to limit the tongue plate from swinging relative to the sliding support in the left, right and up and down directions.

[0012] Furthermore, it also includes an electro-hydraulic directional valve, a first hydraulically controlled check valve, a second hydraulically controlled check valve, a first pressure sensor, a second pressure sensor, and a controller; The first hydraulic port of the electro-hydraulic directional valve is connected to the front chamber of the push hydraulic cylinder via the first hydraulic line; the second hydraulic port of the electro-hydraulic directional valve is connected to the rear chamber of the push hydraulic cylinder via the second hydraulic line; the third hydraulic port of the electro-hydraulic directional valve is connected to the front chamber of the first hydraulic cylinder via the third hydraulic line; and the fourth hydraulic port of the electro-hydraulic directional valve is connected to the rear chamber of the first hydraulic cylinder via the fourth hydraulic line. The first hydraulic port and the second hydraulic port of the first hydraulic control check valve are connected to the second hydraulic line, and the hydraulic control port of the first hydraulic control check valve is connected to the first hydraulic line. The second hydraulic control check valve has its first and second hydraulic ports connected to the fourth hydraulic line, and its hydraulic control port connected to the third hydraulic line. The sensing end of the first pressure sensor is connected to the second hydraulic line; The sensing end of the second pressure sensor is connected to the fourth hydraulic line; The controller is connected via signal cables to the control terminals of the electro-hydraulic directional valve, the first pressure sensor, and the second pressure sensor.

[0013] Furthermore, it also includes a first guide support frame and a second guide support frame; The lower end of the first guide support frame is fixedly connected to the rear end of the rear base, and the first guide support frame is arranged vertically. The lower end of the second guide support frame is fixedly connected to the rear end of the rear base, and the second guide support frame is arranged vertically. A first guide seat is provided on the front side of the upper isolator, and the first guide seat slides in conjunction with the first guide support frame; A second guide seat is provided on the front side of the lower isolator, and the second guide seat slides in conjunction with the second guide support frame; One end of the first hydraulic cylinder is connected to the rear base and / or the first guide support frame, and the other end of the first hydraulic cylinder is connected to the first guide seat and / or the upper isolator. One end of the second hydraulic cylinder is connected to the rear base and / or the second guide support frame, and the other end of the second hydraulic cylinder is connected to the second guide seat and / or the lower isolator.

[0014] Furthermore, the telescopic beam includes a primary telescopic beam, a primary telescopic hydraulic cylinder, a secondary telescopic beam, and a secondary telescopic hydraulic cylinder; The primary telescopic beam slides in conjunction with the rear end of the top beam. The primary telescopic beam extends backward in a horizontal direction and can expand and contract relative to the top beam. The two ends of the first-stage telescopic hydraulic cylinder are connected to the top beam and the first-stage telescopic beam, respectively. The telescopic end of the first-stage telescopic hydraulic cylinder extends and retracts relative to the cylinder body end, thereby driving the first-stage telescopic beam to extend and retract relative to the top beam. The secondary telescopic beam slides in conjunction with the primary telescopic beam, and the secondary telescopic beam extends backward along the horizontal direction. The secondary telescopic beam can extend and contract relative to the primary telescopic beam. The two ends of the secondary telescopic hydraulic cylinder are connected to the primary telescopic beam and the secondary telescopic beam, respectively. The telescopic end of the secondary telescopic hydraulic cylinder extends and retracts relative to the cylinder body end, thereby driving the secondary telescopic beam to extend and retract relative to the primary telescopic beam.

[0015] A method for parallel backfilling operations in a working face, utilizing the aforementioned split-type hydraulic backfilling support, comprises the following steps: Step 1: Keep the front base stationary, and fully retract the telescopic end of the push hydraulic cylinder relative to the cylinder body end to drive the rear base forward by three coal mining steps and keep the rear base stationary. Step 2: Keep the rear base stationary, extend the telescopic end of the push hydraulic cylinder out of the cylinder body by the first coal mining step distance, so as to drive the front base to move forward by the first coal mining step distance relative to the rear base. Step 3: Keep the rear base stationary, extend the telescopic end of the push hydraulic cylinder by a second coal mining step distance relative to the cylinder body end, so as to drive the front base to move forward by a second coal mining step distance relative to the rear base. Step 4: Keep the rear base stationary, extend the telescopic end of the push hydraulic cylinder by the third coal mining step distance relative to the cylinder body end, so as to drive the front base to move forward by the third coal mining step distance relative to the rear base. During steps 1 to 4, starting from when the rear base is stationary, the telescopic end of the first hydraulic cylinder extends relative to the cylinder body, causing the upper isolator to move vertically upward relative to the rear base, making the upper isolator contact the top plate of the working surface; the telescopic end of the second hydraulic cylinder extends relative to the cylinder body, causing the lower isolator to move vertically downward relative to the rear base, making the lower isolator contact the bottom plate of the working surface; the rear chamber of the first hydraulic cylinder is closed by the second hydraulic control check valve, forming a sealed space in the rear chamber of the first hydraulic cylinder, ensuring that the telescopic end of the first hydraulic cylinder does not retract, so as to keep the upper isolator abutting against the top plate and not falling; when the top plate is soft or broken, the top plate releases pressure, the upper isolator continues to move upward, the pressure in the rear chamber of the first hydraulic cylinder decreases, and when the pressure value in the rear chamber of the first hydraulic cylinder sensed by the second pressure sensor reaches the set lower limit pressure value, the controller triggers the electro-hydraulic reversing valve to pressurize and replenish the fluid in the rear chamber of the first hydraulic cylinder; In each of steps 2 to 4, after the telescopic end of the push hydraulic cylinder extends out relative to the cylinder body end by a set coal mining step distance, the rear chamber of the push hydraulic cylinder is closed by the first hydraulic control check valve, forming a sealed space in the rear chamber of the push hydraulic cylinder to ensure that the telescopic end of the push hydraulic cylinder does not retract, so as to keep the rear base from moving in the direction of the front base; when the telescopic end of the push hydraulic cylinder extends out relative to the cylinder body end to switch the coal mining step distance, the pressure in the rear chamber of the push hydraulic cylinder decreases. When the pressure value in the rear chamber of the push hydraulic cylinder sensed by the first pressure sensor reaches the set lower limit pressure value, the controller triggers the electro-hydraulic reversing valve to pressurize and replenish the fluid in the rear chamber of the push hydraulic cylinder; During steps 1 to 4, the rear base, upper isolator and lower isolator seal the top plate and bottom plate of the working surface to fill the space, and paste filling operation is performed on the filling space; During steps 1 to 4, the front base and the top beam above it support the roof of the working face for mining operations. During steps 1 to 4, anchor bolts are used to support the top plate of the working face in the space between the front base and the rear base.

[0016] The beneficial technical effects of this invention are: The split-type filling hydraulic support of the present invention, during the extension and retraction of the extension end of the pushing hydraulic cylinder relative to the cylinder body end, has a tongue plate slidingly cooperating with a sliding support component. The "drawer-type structure" between the tongue plate and the sliding support component provides limiting guidance, ensuring that the extension and retraction end of the pushing hydraulic cylinder and the cylinder body end maintain a relatively precise coaxiality. When the bottom plate of the working face is uneven along the direction and dip, both the pushing hydraulic cylinder and the tongue plate can swing synchronously along the left, right, up, and down directions. When the bottom plate of the working face has a large slope along the direction or dip, the tongue plate can be restricted from swinging relative to the sliding support component in the left, right, up, and down directions. In this way, the pushing hydraulic cylinder can have a large extension ratio, realizing a large step distance (three times the coal mining step distance) pushing of the split-type filling hydraulic support, and can adapt to the working conditions of the bottom plate of the longwall face, avoiding breakage of the pushing hydraulic cylinder and also avoiding the collapse of the rear frame.

[0017] The split-type filling hydraulic support of this invention, comprising a rear base, an upper isolator, and a lower isolator, forms a filling isolation frame that can be flexibly adjusted to adapt to different filling isolation heights and provides stable support for the paste. A hydraulically controlled one-way valve self-locks and maintains pressure in the rear chamber of the pushing hydraulic cylinder and the first hydraulic cylinder, ensuring that the telescopic end of the pushing hydraulic cylinder does not retract, the front and rear bases cannot approach each other, and the filling isolation frame cannot move forward even under pressure from unsolidified paste. This also ensures that the telescopic end of the first hydraulic cylinder does not retract, thus maintaining the upper... The isolator does not fall off the top plate; the controller signal connects to the electro-hydraulic directional valve and pressure sensor to realize the automatic judgment and execution of the first hydraulic cylinder and the pushing hydraulic cylinder for filling the isolator, so that the first hydraulic cylinder and the pushing hydraulic cylinder automatically pressurize and replenish fluid. When the top plate is soft or broken, it avoids the initial supporting force of the first hydraulic cylinder from decreasing, which would cause a gap between the upper isolator and the top plate. During the extension process of the pushing hydraulic cylinder, it avoids the pressure in the rear chamber of the pushing hydraulic cylinder from decreasing, which would cause the base to move forward under the thrust of the unsolidified paste, thereby preventing the paste from overflowing.

[0018] The parallel operation method for backfilling and mining of the working face of the present invention is a "four-mining-one-filling" backfilling and mining process. During the paste filling, the rear base remains stationary, and the pushing hydraulic cylinder can drive the front base to move forward relative to the rear base by three times the coal mining step distance, which can cut coal three times. After the paste solidifies, the rear base (filling isolation frame) can be pulled to cut coal for the fourth and fifth times. At the same time as the paste filling, the front base and the front frame formed by its upper top beam carry out parallel front mining operations. The space between the front frame and the filling isolation frame carries out parallel support operations to anchor the roof of the working face. This realizes the parallel operation of filling, mining and support, which can greatly improve the mining operation time and the efficiency of mining and filling operations. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the push hydraulic cylinder of the split filling hydraulic support in the retracted state according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the push hydraulic cylinder of the split filling hydraulic support in the extended state according to an embodiment of the present invention; Figure 3 This is a partial structural diagram of the adaptive pushing mechanism in an embodiment of the present invention from a side view. Figure 4 This is a schematic diagram of the adaptive pushing mechanism in an embodiment of the present invention from a top-down view. Figure 1 ; Figure 5 This is a schematic diagram of the adaptive pushing mechanism in an embodiment of the present invention from a top-down view. Figure 2 ; Figure 6 The three-dimensional structure of the filling isolation frame after removing the tongue plate in an embodiment of the present invention. Figure 1 ; Figure 7 The front view of the filling isolation frame after removing the tongue plate in an embodiment of the present invention. Figure 1 ; Figure 8 The three-dimensional structure of the filling isolation frame after removing the tongue plate in an embodiment of the present invention. Figure 2 ; Figure 9 The front view of the filling isolation frame after removing the tongue plate in an embodiment of the present invention. Figure 2 ; Figure 10 A side view of a partial cross-section of the filling isolation frame body according to an embodiment of the present invention. Figure 1 ; Figure 11 A side view of a partial cross-section of the filling isolation frame in an embodiment of the present invention. Figure 2 ; Figure 12 A side view of the filling isolation frame in a first posture according to an embodiment of the present invention; Figure 13 A side view of the filling isolation frame in a second posture according to an embodiment of the present invention; Figure 14 A side view of the filling isolation frame in a third posture according to an embodiment of the present invention; Figure 15 This is a layout diagram of a portion of the hydraulic control system for filling the isolation frame, according to an embodiment of the present invention. Figure 16 This is a bottom view of the top beam and telescopic beam according to an embodiment of the present invention; Figure 17 This is a comparative diagram of the operation flow of the split-type hydraulic support for backfilling in the parallel operation method for backfilling in the working face according to an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. Certain embodiments of the invention will be described more fully below with reference to the accompanying drawings, and some, but not all, of these embodiments will be shown. In fact, various embodiments of the invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to enable the invention to meet applicable legal requirements.

[0021] In the description of this invention, it should be noted that the terms "inner," "outer," "upper," "lower," "front," and "rear," 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 invention and for 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 invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In this embodiment of the invention, a split-type filling hydraulic support and a method for parallel operation of backfilling and mining at the working face are provided. Please refer to [reference needed]. Figures 1 to 17 As shown.

[0023] A split-type filling hydraulic support includes a front base 11, a top beam (front top beam 121 and rear top beam 122), an inclined beam 13, front and rear connecting rods 14, a telescopic beam 15, a rear base 21, an upper isolator 22, a lower isolator 23, a first hydraulic cylinder 31, and a second hydraulic cylinder 32.

[0024] The top beam includes a front top beam 121 and a rear top beam 122, with the rear end of the front top beam 121 and the front end of the rear top beam 122 hinged together. The top beam is located above the front base 11 and is connected to the front base 11 via hydraulic columns (front hydraulic column 161 and rear hydraulic column 162). The top beam is also connected to the front base 11 via an inclined beam 13. A telescopic beam 15 is located at the rear end of the top beam and extends rearward in a horizontal direction, allowing it to extend and retract relative to the top beam.

[0025] The lower end of the front hydraulic column 161 is connected to the front base 11, and the upper end of the front hydraulic column 161 is connected to the front top beam 121. The lower end of the rear hydraulic column 162 is connected to the front base 11, and the upper end of the rear hydraulic column 162 is connected to the rear top beam 122. The upper end of the inclined beam 13 is connected to the front top beam 121, and the inclined beam 13 and the front top beam 121 are connected via a balance hydraulic cylinder 131. The lower end of the inclined beam 13 is connected to the upper end of the front and rear connecting rods 14, and the lower end of the front and rear connecting rods 14 is connected to the front base 11.

[0026] The front base 11 and the rear base 21 are connected by a push-adaptive mechanism.

[0027] The adaptive pushing mechanism includes a first hinge assembly, a pushing hydraulic cylinder 41, a second hinge assembly, a sliding support 42, and a tongue plate 43.

[0028] The first hinge assembly is mounted on the rear end of the front base 11. The telescopic end of the push hydraulic cylinder 41 is connected to the first hinge assembly. The cylinder body end of the push hydraulic cylinder 41 is provided with a third hinge assembly, which is hinged to the rear base 21.

[0029] The telescopic end of the push hydraulic cylinder 41 can swing relative to the front base 11 in the left, right and up and down directions, and the cylinder body end of the push hydraulic cylinder 41 can swing relative to the rear base 21 in the up and down directions.

[0030] The second hinge assembly is mounted on the rear end of the front base 11, and the sliding support 42 is disposed on the rear base 21, extending along the front and rear directions of the rear base 21.

[0031] The tongue plate 43 slides in conjunction with the sliding support 42. The front end of the tongue plate 43 is connected to the second hinge assembly. The front end of the tongue plate 43 can swing relative to the front base 11 in the left, right, up, and down directions.

[0032] Specifically, the direction of extension and retraction of the telescopic end of the pushing hydraulic cylinder 41 relative to the cylinder body is parallel to the direction of sliding of the tongue plate 43 relative to the sliding support member 42. In this way, the "oscillating motion of the pushing hydraulic cylinder 41 and the extension and retraction motion of the telescopic end of the pushing hydraulic cylinder 41 relative to the cylinder body" are synchronized with the "oscillating motion of the tongue plate 43 and the extension and retraction motion of the tongue plate 43 relative to the sliding support member 42".

[0033] By synchronizing the swing motion of the "push hydraulic cylinder 41" with the swing motion of the "tongue plate 43", the front base 11 and the rear base 21 can be misaligned in the left and right or up and down directions to adapt to the uneven working conditions of the bottom plate of the working surface along the tendency or direction.

[0034] The first hinge assembly includes a first mounting base 441 and a first swing base 442. The first mounting base 441 is disposed at the rear end of the front base 11. The first swing base 442 is hinged to the first mounting base 441 via a first hinge 461. The first swing base 442 can swing relative to the first mounting base 441 in the left and right directions. The extension end of the push hydraulic cylinder 41 is hinged to the first swing base 442 via a second hinge 462. The extension end of the push hydraulic cylinder 41 can swing relative to the first swing base 442 in the up and down directions.

[0035] The second hinge assembly includes a second mounting base 451 and a second swing base 452. The second mounting base 451 is located at the rear end of the front base 11. The second swing base 452 is hinged to the second mounting base 451 via a third hinge 463. The second swing base 452 can swing relative to the second mounting base 451 in the up and down directions. The front end of the tongue plate 43 is hinged to the second swing base 452. The front end of the tongue plate 43 can swing relative to the second swing base 452 in the left and right directions.

[0036] The second swing seat 452 is provided with a first limiting hole on the left and right sides of the fourth hinge 464, and the front end of the tongue plate 43 is provided with a second limiting hole 431 corresponding to the first limiting hole. The first limiting hole and the second limiting hole 431 can cooperate with the limiting pin.

[0037] After the front base 11 is pushed forward to the set position by the push hydraulic cylinder 41, the first limiting hole and the second limiting hole 431 are engaged with the limiting pin, so that the front end of the tongue plate 43 cannot swing in the left or right direction relative to the second swing seat 452, thereby keeping the front base 11 and the rear base 21 from swinging left or right. In addition, the push hydraulic cylinder 41 is set as a self-locking hydraulic cylinder, and the rear base 21 is kept from moving forward by the self-locking of the push hydraulic cylinder 41.

[0038] The third hinge assembly includes a mounting bracket 471, a hinge shaft 472, and a hinge seat 473. The mounting bracket 471 is disposed at the cylinder end of the pushing hydraulic cylinder 41. The hinge shaft 472 is positioned at opposite left and right positions of the mounting bracket 471. The hinge shaft 472 hinges to the hinge seat 473, which is disposed on the rear base 21. The hinge shaft 472 rotates relative to the hinge seat 473, causing the cylinder end of the pushing hydraulic cylinder 41 to swing relative to the rear base 21 in the up-down direction.

[0039] The sliding support 42 is a hollow structure, with the tongue plate 43 located inside it. The tongue plate 43 and the sliding support 42 cooperate to form a "drawer-type structure." Specifically, the inner contour of the sliding support 42 cooperates with the outer contour of the tongue plate 43 to restrict the tongue plate 43 from swinging relative to the sliding support 42 in the left-right and up-down directions. The inner contour of the sliding support 42 is a cuboid, and the outer contour of the tongue plate 43 is also a cuboid. Thus, when the bottom plate of the working surface has a significant slope along its direction or inclination, the cooperation between the inner contour of the sliding support 42 and the outer contour of the tongue plate 43 restricts the tongue plate 43 from swinging relative to the sliding support 42 in the left-right or up-down directions, preventing the filling isolation frame from tipping over in these directions.

[0040] The telescopic end of the pushing hydraulic cylinder 41 extends and retracts relative to the cylinder body end to drive the front base 11 to move relative to the rear base 21. With the "drawer-type structure" for limiting and guiding, the length of the pushing hydraulic cylinder 41 can be designed to be as long as possible to achieve a large step distance (three times the coal mining step distance) pushing of the split filling hydraulic support.

[0041] The rear base 21 is configured as a box structure and is arranged horizontally. The upper isolator 22 is slidably engaged with the rear base 21 and can move vertically relative to the rear base 21; the lower isolator 23 is slidably engaged with the rear base 21 and can move vertically relative to the rear base 21; wherein, the upper isolator 22 and the lower isolator 23 are stacked in the front and rear directions, and in this embodiment, the lower isolator 23 is in front and the upper isolator 22 is behind.

[0042] The first hydraulic cylinder 31 extends and retracts relative to the cylinder body end to drive the upper isolator 22 to move vertically relative to the rear base 21; the second hydraulic cylinder 32 extends and retracts relative to the cylinder body end to drive the lower isolator 23 to move vertically relative to the rear base 21.

[0043] The lower end of the first guide support frame 241 is fixedly connected to the rear end of the rear base 21, and the first guide support frame 241 is arranged vertically. The lower end of the second guide support frame 242 is fixedly connected to the rear end of the rear base 21, and the second guide support frame 242 is arranged vertically. There are two first guide support frames 241, one on the left and one on the right side of the rear end of the rear base 21. There is one second guide support frame 242, located in the middle of the rear end of the rear base 21.

[0044] The upper isolator 22 is configured as a plate structure, and a first guide seat 251 is provided on the front side of the upper isolator 22. The first guide seat 251 is slidably engaged with the first guide support frame 241. The lower isolator 23 is configured as a plate structure, and a second guide seat 252 is provided on the front side of the lower isolator 23. The second guide seat 252 is slidably engaged with the second guide support frame 242.

[0045] The cylinder body end of the first hydraulic cylinder 31 is hinged to the lower end of the first guide support frame 241, and the telescopic end of the first hydraulic cylinder 31 is hinged to the upper end of the upper isolator 22. The telescopic end of the first hydraulic cylinder 31 extends relative to the cylinder body end to drive the upper isolator 22 to move upward; the telescopic end of the first hydraulic cylinder 31 retracts relative to the cylinder body end to drive the upper isolator 22 to move downward.

[0046] The cylinder body end of the second hydraulic cylinder 32 is hinged to the lower end of the second guide support frame 242, and the telescopic end of the second hydraulic cylinder 32 is connected to the upper end of the lower isolator 23. The telescopic end of the second hydraulic cylinder 32 extends relative to the cylinder body end to drive the lower isolator 23 to move upward; the telescopic end of the second hydraulic cylinder 32 retracts relative to the cylinder body end to drive the lower isolator 23 to move downward.

[0047] The first guide support frame 241 is configured as a columnar structure, and the first guide seat 251 is configured as a sleeve-shaped structure. The first guide support frame 241 is nested inside the first guide seat 251. The interior of the first guide support frame 241 is configured as a hollow cavity, and the first hydraulic cylinder 31 is located inside the hollow cavity.

[0048] The second guide support frame 242 is configured as a plate structure, and the second guide seat 252 is configured as a groove structure. The second guide support frame 242 is nested inside the second guide seat 252.

[0049] An isolation strip 26 is provided on the upper end face of the upper isolation body 22. The isolation strip 26 is made of rubber material. There are two isolation strips 26, which are arranged in parallel and extend in the left and right directions, respectively.

[0050] The upper end of the upper isolator 22 has a filling port 221 for injecting paste, which is used to connect to the filling pipe. During the filling operation, the paste enters the filling area behind the filling isolator through the filling pipe and the filling port 2211.

[0051] The filling and isolation frame in this embodiment operates as follows: During the mining process (corresponding to step 1 below), the lower isolation body 23 moves upward, and the lower isolation body 23 is raised about 190mm relative to the bottom plate to facilitate the removal of gangue.

[0052] During the paste filling operation, the lower end of the isolation cloth is placed below the lower end of the lower isolation body 23. The lower isolation body 23 moves downward, and the lower end of the lower isolation body 32 and the bottom plate jointly press against the lower end of the isolation cloth. The upper end of the isolation cloth is placed over the upper end face of the upper isolation body 22, and the upper isolation body 22 is moved upward according to the mining height of the longwall face. When the upper end face of the upper isolation body 22 is close to the roof, two more layers of straw fence are laid on the isolation cloth on the upper end face of the upper isolation body 22. The upper isolation body 22 continues to move upward, and the upper end of the upper isolation body 22 and the roof plate jointly press against the upper end of the isolation cloth.

[0053] The filling pipe is connected to the filling interface 221. An opening is set in the isolation cloth corresponding to the position of the filling interface 221. The paste enters the filling area behind the filling isolation frame through the filling pipe, the filling interface 221 and the opening on the isolation cloth.

[0054] The upper insulating body 22 has an insulating strip 26 on its upper end face, so that the insulating cloth contacts the insulating strip 26 but does not directly contact the upper end face of the upper insulating body 22, thus avoiding damage to the insulating cloth. In addition, the insulating strip 26 on the upper end face of the upper insulating body 22 can reduce the number of straw fencing layers, reducing the number of straw fencing layers from three to two.

[0055] In this embodiment, the upper isolation body 22 can move vertically under the push of the first hydraulic cylinder 31, and the lower isolation body 23 can move vertically under the push of the second hydraulic cylinder 32. At the same time, the upper isolation body 22 and the lower isolation body 23 are stacked in the front and back directions. The filling isolation height is limited by the distance between the upper end of the upper isolation body 22 and the lower end of the lower isolation body 23. In this way, the filling isolation height can be flexibly adjusted according to the mining height of the longwall face. The rear base 21 and the guide support frame (first guide support frame 241, second guide support frame 242) are arranged in an L-shape. Furthermore, the guide support frame (first guide support frame 241, second guide support frame 242) and the guide seat (first guide seat 251, second guide seat 252) are nested together, so that the isolation body (upper isolation body 22, lower isolation body 23) can stably support the paste during the paste solidification process.

[0056] The first hydraulic port of the electro-hydraulic directional valve 51 is connected to the front chamber of the push hydraulic cylinder 41 via the first hydraulic line 61; the second hydraulic port of the electro-hydraulic directional valve 51 is connected to the rear chamber of the push hydraulic cylinder 41 via the second hydraulic line 62; the third hydraulic port of the electro-hydraulic directional valve 51 is connected to the front chamber of the first hydraulic cylinder 31 via the third hydraulic line 63; and the fourth hydraulic port of the electro-hydraulic directional valve 51 is connected to the rear chamber of the first hydraulic cylinder 31 via the fourth hydraulic line 64.

[0057] The first valve core of the electro-hydraulic directional valve 51 is switched to the fluid supply position for the rear chamber of the push hydraulic cylinder 41 to supply fluid to the rear chamber of the push hydraulic cylinder 41. The first valve core of the electro-hydraulic directional valve 51 is switched to the fluid supply position for the front chamber of the push hydraulic cylinder 41 to supply fluid to the front chamber of the push hydraulic cylinder 41. The first valve core of the electro-hydraulic directional valve 51 is switched to the shut-off position to close the front and rear chambers of the push hydraulic cylinder 41.

[0058] The second valve core of the electro-hydraulic directional valve 51 switches to the position of supplying fluid to the rear chamber of the first hydraulic cylinder 31, so as to supply fluid to the rear chamber of the first hydraulic cylinder 31. The second valve core of the electro-hydraulic directional valve 51 switches to the position of supplying fluid to the front chamber of the first hydraulic cylinder 31, so as to supply fluid to the front chamber of the first hydraulic cylinder 31. The second valve core of the electro-hydraulic directional valve 51 switches to the cut-off position, so as to close the front and rear chambers of the first hydraulic cylinder 31.

[0059] The first hydraulic port and the second hydraulic port of the first hydraulically controlled check valve 521 are connected to the second hydraulic line 62, and the hydraulic control port of the first hydraulically controlled check valve 521 is connected to the first hydraulic line 61. The hydraulic control port of the first hydraulically controlled check valve 521 is connected to the first hydraulic line 61 via the fifth hydraulic line 65.

[0060] The first hydraulically controlled check valve 521 allows hydraulic oil (emulsion) to flow unidirectionally from the electro-hydraulic directional valve 51 toward the rear chamber of the push hydraulic cylinder 41, thereby forming a sealed space in the rear chamber of the push hydraulic cylinder 41. When the pressure in the first hydraulic line 61 (the fifth hydraulic line 65) increases, bidirectional flow occurs between the first hydraulic port and the second hydraulic port of the first hydraulically controlled check valve 521.

[0061] The first and second hydraulic ports of the second hydraulic control check valve 522 are connected to the fourth hydraulic line 64, and the hydraulic control port of the second hydraulic control check valve 522 is connected to the third hydraulic line 63.

[0062] The second hydraulically controlled check valve 522 allows the hydraulic fluid (emulsion) to flow unidirectionally from the electro-hydraulic directional valve 51 towards the rear chamber of the first hydraulic cylinder 31, thus forming a sealed space in the rear chamber of the first hydraulic cylinder 31. When the pressure in the third hydraulic line 63 increases, bidirectional flow occurs between the first and second hydraulic ports of the second hydraulically controlled check valve 522.

[0063] The controller 7 is connected to the control terminal of the electro-hydraulic directional valve 51 via signal cable 71.

[0064] The sensing end of the first pressure sensor 721 is connected to the second hydraulic line 62, and the controller 7 is connected to the control end of the first pressure sensor 721 via the signal cable 71.

[0065] The sensing end of the second pressure sensor 722 is connected to the fourth hydraulic line 64, and the controller 7 is connected to the control end of the second pressure sensor 722 via the signal cable 71.

[0066] The hydraulic port of the first safety valve 731 is connected to the second hydraulic line 62.

[0067] The hydraulic port of the second safety valve 732 is connected to the fourth hydraulic line 64.

[0068] The operation process of the hydraulic control system for filling the isolation frame in this embodiment is as follows: The rear chamber of the pushing hydraulic cylinder 41 is closed by the first hydraulically controlled check valve 521. When the pushing hydraulic cylinder 41 is not in operation, it is locked, forming a sealed space in its rear chamber, ensuring that the telescopic end of the pushing hydraulic cylinder 41 does not retract. The rear base 21 cannot move forward to approach the front base 11, and the filling isolation frame cannot move forward even under the pressure of the unsolidified paste. During the extension process of the pushing hydraulic cylinder 41, the front frame moves forward for mining operations while the filling isolation frame remains stationary, and the pressure in the rear chamber of the pushing hydraulic cylinder 41 decreases. The first pressure sensor 721 senses the pressure value in the rear chamber of the pushing hydraulic cylinder 41 in real time. When the pressure value sensed by the first pressure sensor 721 reaches the set lower limit pressure value, the controller 7 triggers the first valve core of the electro-hydraulic directional valve 51 to switch to the liquid supply position for the rear chamber of the pushing hydraulic cylinder 41, so as to pressurize and replenish the liquid in the rear chamber of the pushing hydraulic cylinder 41. When the pressure value sensed by the first pressure sensor 721 reaches the set upper limit pressure value, the controller 7 triggers the first valve core of the electro-hydraulic directional valve 51 to switch to the cut-off position, thereby closing the rear chamber of the push hydraulic cylinder 41. When the filling isolation frame is subjected to excessive pressure from the uncured paste, the pressure value in the rear chamber of the push hydraulic cylinder 41 increases. In special circumstances, if the pressure value in the rear chamber of the push hydraulic cylinder 41 exceeds the set pressure value of the first safety valve 731, the first safety valve 731 opens to prevent damage to the push hydraulic cylinder 41.

[0069] When isolation is required, the controller 7 triggers the second valve core of the electro-hydraulic directional valve 51 to switch to the liquid supply position of the rear chamber of the first hydraulic cylinder 31, supplying liquid to the rear chamber of the first hydraulic cylinder 31. The telescopic end of the first hydraulic cylinder 31 extends, driving the upper isolation body 22 to move upward. The upper isolation body 22 contacts the top plate, forming a closed isolation space at the rear of the filling isolation frame for filling paste.

[0070] The rear chamber of the first hydraulic cylinder 31 is closed by the second hydraulic check valve 522. When the first hydraulic cylinder 31 is not in operation, it is locked, forming a sealed space in its rear chamber. This ensures that the telescopic end of the first hydraulic cylinder 31 does not retract, preventing the upper isolator 22 from falling against the top plate. When the top plate is soft or broken, it releases pressure, allowing the upper isolator 22 to continue moving upwards, reducing the pressure in the rear chamber of the first hydraulic cylinder 31. The second pressure sensor 722 continuously senses the pressure value in the rear chamber of the first hydraulic cylinder 31. When the pressure value sensed by the second pressure sensor 722 reaches the set lower limit pressure value, the controller 7 triggers the second valve core of the electro-hydraulic directional valve 51 to switch to the fluid supply position for the rear chamber of the first hydraulic cylinder 31, thus pressurizing and replenishing the fluid. When the pressure value sensed by the second pressure sensor 722 reaches the set upper limit pressure value, the controller 7 triggers the second valve core of the electro-hydraulic directional valve 51 to switch to the shut-off position, thus closing the rear chamber of the first hydraulic cylinder 31. When the upper isolator 22 is subjected to a momentary impact from the top plate, the pressure value of the rear chamber of the first hydraulic cylinder 31 increases instantaneously. When the pressure value of the rear chamber of the first hydraulic cylinder 31 is higher than the set pressure value of the second safety valve 732, the second safety valve 732 opens to prevent damage to the first hydraulic cylinder 31.

[0071] The telescopic beam 15 includes a primary telescopic beam 151, a primary telescopic hydraulic cylinder 152, a secondary telescopic beam 153, and a secondary telescopic hydraulic cylinder 154.

[0072] The rear end of the rear top beam 122 is a hollow structure. The primary telescopic beam 151 is nested inside the hollow structure at the rear end of the rear top beam 122. The primary telescopic beam 151 slides in conjunction with the rear end of the rear top beam 122. The primary telescopic beam 151 extends backward along the horizontal direction and can extend and retract relative to the rear top beam 122.

[0073] The two ends of the first-stage telescopic hydraulic cylinder 152 are connected to the rear top beam 122 and the first-stage telescopic beam 151, respectively. The telescopic end of the first-stage telescopic hydraulic cylinder 152 extends and retracts relative to the cylinder body end, thereby driving the first-stage telescopic beam 151 to extend and retract relative to the rear top beam 122.

[0074] The lower surface of the rear top beam 122 is slotted at the position corresponding to the hollow structure to facilitate the inspection and replacement of the first-stage telescopic hydraulic cylinder 152.

[0075] The middle position of the primary telescopic beam 151 is a hollow structure. The secondary telescopic beam 153 is nested inside the hollow structure of the primary telescopic beam 151. The secondary telescopic beam 153 slides in conjunction with the primary telescopic beam 151. The secondary telescopic beam 153 extends backward along the horizontal direction and can extend and retract relative to the primary telescopic beam 151.

[0076] The two ends of the secondary telescopic hydraulic cylinder 154 are connected to the primary telescopic beam 151 and the secondary telescopic beam 153 respectively. The telescopic end of the secondary telescopic hydraulic cylinder 154 extends and retracts relative to the cylinder body end, thereby driving the secondary telescopic beam 153 to extend and retract relative to the primary telescopic beam 151.

[0077] The lower surface of the primary telescopic beam 151 is slotted at the location corresponding to the hollow structure to facilitate the inspection and replacement of the secondary telescopic hydraulic cylinder 154.

[0078] There are two primary telescopic hydraulic cylinders 152, located on both sides of the primary telescopic beam 151; and one secondary telescopic hydraulic cylinder 154, located in the middle of the two primary telescopic hydraulic cylinders 152.

[0079] When the primary telescopic beam 151 and the secondary telescopic beam 153 are fully retracted, a 280mm*300mm gap is formed between the primary telescopic beam 151 and the upper end face of the upper isolator 22, which can be used for anchor bolt support drilling. Workers can carry out operations under the support of the rear top beam 122 and the telescopic beam 15, ensuring the safety of anchor bolt support construction and paste filling operations.

[0080] A method for parallel backfilling operations in a working face, using the split-type backfilling hydraulic support described in this embodiment, comprises the following steps: Step 1: Keep the front base 11 stationary, and fully retract the telescopic end of the push hydraulic cylinder 41 relative to the cylinder body end to drive the rear base 21 forward by three coal mining steps and keep the rear base 21 stationary. Step 2: Keep the rear base 21 stationary, extend the telescopic end of the push hydraulic cylinder 41 out of the cylinder body by the first coal mining step distance, so as to drive the front base 11 to move forward by the first coal mining step distance relative to the rear base 21. Step 3: Keep the rear base 21 stationary, extend the telescopic end of the push hydraulic cylinder 41 by a second coal mining step relative to the cylinder body end, so as to drive the front base 11 to move forward by a second coal mining step relative to the rear base 21. Step 4: Keep the rear base 21 stationary, extend the telescopic end of the push hydraulic cylinder 41 by the third coal mining step relative to the cylinder body end, so as to drive the front base 11 to move forward by the third coal mining step relative to the rear base 21. During steps 1 to 4, starting from when the rear base 21 remains stationary, the telescopic end of the first hydraulic cylinder 31 extends relative to the cylinder body end, causing the upper isolator 22 to move vertically upward relative to the rear base 21, so that the upper isolator 22 contacts the top plate of the working surface; the telescopic end of the second hydraulic cylinder 32 extends relative to the cylinder body end, causing the lower isolator 23 to move vertically downward relative to the rear base 21, so that the lower isolator 23 contacts the bottom plate of the working surface; the first hydraulic cylinder 31 is closed by the second hydraulic control check valve 522. The rear chamber of the first hydraulic cylinder 31 forms a sealed space, ensuring that the telescopic end of the first hydraulic cylinder 31 does not retract, so as to keep the upper isolator 22 abutting against the top plate and not falling. When the top plate is soft or broken, the top plate releases pressure, the upper isolator 22 continues to move upward, and the pressure in the rear chamber of the first hydraulic cylinder 31 decreases. When the second pressure sensor 722 senses that the pressure value in the rear chamber of the first hydraulic cylinder 31 reaches the set lower limit pressure value, the controller 7 triggers the electro-hydraulic reversing valve 51 to pressurize and replenish the fluid in the rear chamber of the first hydraulic cylinder 31. In each of steps 2 to 4, after the telescopic end of the push hydraulic cylinder 41 extends out relative to the cylinder body end by a set coal mining step distance, the rear chamber of the push hydraulic cylinder 41 is closed by the first hydraulic control check valve 521, forming a sealed space in the rear chamber of the push hydraulic cylinder 41 to ensure that the telescopic end of the push hydraulic cylinder 41 does not retract, so as to keep the rear base 21 from moving towards the front base 11; when the telescopic end of the push hydraulic cylinder 41 extends out relative to the cylinder body end to switch the coal mining step distance, the pressure in the rear chamber of the push hydraulic cylinder 41 decreases. When the first pressure sensor 721 senses that the pressure value in the rear chamber of the push hydraulic cylinder 41 reaches the set lower limit pressure value, the controller 7 triggers the electro-hydraulic reversing valve 51 to pressurize and replenish the fluid in the rear chamber of the push hydraulic cylinder 41. During steps 1 to 4, the rear base 21, upper isolator 22 and lower isolator 23 seal the top and bottom plates of the working surface to fill the space, and paste is used to fill the space. During steps 1 to 4, the front base 11 and the top beam above it support the roof of the working face for mining operations. During steps 1 to 4, anchor bolts are used to support the top plate of the working face in the space between the front base 11 and the rear base 21.

[0081] The present embodiment has now been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the present invention's split-type filling hydraulic support and the parallel operation method for backfilling in the working face. Of course, the specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A split-type filling hydraulic support, characterized in that, include: Front base; The top beam is located above the front base. The top beam is connected to the front base via a hydraulic column, and the top beam is also connected to the front base via an inclined beam. The telescopic beam is located at the rear end of the top beam. The telescopic beam extends backward in a horizontal direction and can expand and contract relative to the top beam. Rear base; The front base and the rear base are connected by a push-adaptive mechanism; The upper isolator slides onto the rear base, allowing the upper isolator to move vertically relative to the rear base; The lower isolator slides onto the rear base, allowing the lower isolator to move vertically relative to the rear base. The upper and lower isolation bodies are stacked along the front and rear directions; The first hydraulic cylinder extends and retracts relative to the cylinder body end to drive the upper isolator to move vertically relative to the rear base. The second hydraulic cylinder extends and retracts relative to the cylinder body end to drive the lower isolator to move vertically relative to the rear base.

2. The split-type filling hydraulic support according to claim 1, characterized in that: The adaptive pushing mechanism includes a first hinge assembly, a pushing hydraulic cylinder, a second hinge assembly, a sliding support, and a tongue plate; The first hinge assembly is mounted on the rear end of the front base; The telescopic end of the pushing hydraulic cylinder is connected to the first hinge assembly, and the cylinder body end of the pushing hydraulic cylinder is provided with a third hinge assembly, which is hinged to the base. The telescopic end of the push hydraulic cylinder can swing relative to the front base in the left, right and up and down directions, and the cylinder body end of the push hydraulic cylinder can swing relative to the rear base in the up and down direction. The second hinge assembly is mounted at the rear end of the front base; The sliding support is located on the rear base and extends along the front and rear directions of the rear base. The tongue plate slides in conjunction with the sliding support, and the front end of the tongue plate is connected to the second hinge assembly. The front end of the tongue plate can swing relative to the front base in the left, right, up, and down directions. In this case, the direction of extension and retraction of the telescopic end of the push hydraulic cylinder relative to the cylinder body end is parallel to the direction of sliding of the tongue plate relative to the sliding support.

3. A split-type filling hydraulic support according to claim 2, characterized in that: The first hinge assembly includes a first mounting base and a first swing base. The first mounting base is disposed at the rear end of the front base. The first swing base is hinged to the first mounting base. The first swing base can swing relative to the first mounting base in the left and right directions. The telescopic end of the push hydraulic cylinder is hinged to the first swing base. The telescopic end of the push hydraulic cylinder can swing relative to the first swing base in the up and down directions.

4. A split-type filling hydraulic support according to claim 2, characterized in that: The second hinge assembly includes a second mounting base and a second swing base. The second mounting base is disposed at the rear end of the front base. The second swing base is hinged to the second mounting base. The second swing base can swing relative to the second mounting base in the up and down direction. The front end of the tongue plate is hinged to the second swing base. The front end of the tongue plate can swing relative to the second swing base in the left and right direction.

5. A split-type filling hydraulic support according to claim 4, characterized in that: The second swing seat is provided with at least one first limiting hole, and the front end of the tongue plate is provided with a second limiting hole corresponding to the first limiting hole. The first limiting hole and the second limiting hole can cooperate with the limiting pin.

6. A split-type filling hydraulic support according to claim 2, characterized in that: The sliding support is configured as a hollow structure, and the tongue plate is located inside the sliding support. The inner contour of the sliding support matches the outer contour of the tongue plate to limit the tongue plate from swinging relative to the sliding support in the left, right and up and down directions.

7. A split-type filling hydraulic support according to claim 2, characterized in that: It also includes an electro-hydraulic directional valve, a first hydraulically controlled check valve, a second hydraulically controlled check valve, a first pressure sensor, a second pressure sensor, and a controller; The first hydraulic port of the electro-hydraulic directional valve is connected to the front chamber of the push hydraulic cylinder via the first hydraulic line; the second hydraulic port of the electro-hydraulic directional valve is connected to the rear chamber of the push hydraulic cylinder via the second hydraulic line; the third hydraulic port of the electro-hydraulic directional valve is connected to the front chamber of the first hydraulic cylinder via the third hydraulic line; and the fourth hydraulic port of the electro-hydraulic directional valve is connected to the rear chamber of the first hydraulic cylinder via the fourth hydraulic line. The first hydraulic port and the second hydraulic port of the first hydraulic control check valve are connected to the second hydraulic line, and the hydraulic control port of the first hydraulic control check valve is connected to the first hydraulic line. The second hydraulic control check valve has its first and second hydraulic ports connected to the fourth hydraulic line, and its hydraulic control port connected to the third hydraulic line. The sensing end of the first pressure sensor is connected to the second hydraulic line; The sensing end of the second pressure sensor is connected to the fourth hydraulic line; The controller is connected via signal cables to the control terminals of the electro-hydraulic directional valve, the first pressure sensor, and the second pressure sensor.

8. A split-type filling hydraulic support according to claim 1, characterized in that: It also includes a first guide support frame and a second guide support frame; The lower end of the first guide support frame is fixedly connected to the rear end of the rear base, and the first guide support frame is arranged vertically. The lower end of the second guide support frame is fixedly connected to the rear end of the rear base, and the second guide support frame is arranged vertically. A first guide seat is provided on the front side of the upper isolator, and the first guide seat slides in conjunction with the first guide support frame; A second guide seat is provided on the front side of the lower isolator, and the second guide seat is slidably engaged with the second guide support frame; One end of the first hydraulic cylinder is connected to the rear base and / or the first guide support frame, and the other end of the first hydraulic cylinder is connected to the first guide seat and / or the upper isolator. One end of the second hydraulic cylinder is connected to the rear base and / or the second guide support frame, and the other end of the second hydraulic cylinder is connected to the second guide seat and / or the lower isolator.

9. A split-type filling hydraulic support according to claim 1, characterized in that: The telescopic beam includes a primary telescopic beam, a primary telescopic hydraulic cylinder, a secondary telescopic beam, and a secondary telescopic hydraulic cylinder; The primary telescopic beam slides in conjunction with the rear end of the top beam. The primary telescopic beam extends backward in a horizontal direction and can expand and contract relative to the top beam. The two ends of the first-stage telescopic hydraulic cylinder are connected to the top beam and the first-stage telescopic beam, respectively. The telescopic end of the first-stage telescopic hydraulic cylinder extends and retracts relative to the cylinder body end, thereby driving the first-stage telescopic beam to extend and retract relative to the top beam. The secondary telescopic beam slides in conjunction with the primary telescopic beam, and the secondary telescopic beam extends backward along the horizontal direction. The secondary telescopic beam can extend and contract relative to the primary telescopic beam. The two ends of the secondary telescopic hydraulic cylinder are connected to the primary telescopic beam and the secondary telescopic beam, respectively. The telescopic end of the secondary telescopic hydraulic cylinder extends and retracts relative to the cylinder body end, thereby driving the secondary telescopic beam to extend and retract relative to the primary telescopic beam.

10. A method for parallel operation of backfilling in a working face, using the split-type backfilling hydraulic support as described in any one of claims 1 to 9, characterized in that, The method steps are as follows: Step 1: Keep the front base stationary, and fully retract the telescopic end of the push hydraulic cylinder relative to the cylinder body end to drive the rear base forward by three coal mining steps and keep the rear base stationary. Step 2: Keep the rear base stationary, extend the telescopic end of the push hydraulic cylinder out of the cylinder body by the first coal mining step distance, so as to drive the front base to move forward by the first coal mining step distance relative to the rear base. Step 3: Keep the rear base stationary, extend the telescopic end of the push hydraulic cylinder by a second coal mining step distance relative to the cylinder body end, so as to drive the front base to move forward by a second coal mining step distance relative to the rear base. Step 4: Keep the rear base stationary, extend the telescopic end of the push hydraulic cylinder by the third coal mining step distance relative to the cylinder body end, so as to drive the front base to move forward by the third coal mining step distance relative to the rear base. During steps 1 to 4, starting from when the rear base is stationary, the telescopic end of the first hydraulic cylinder extends relative to the cylinder body, causing the upper isolator to move vertically upward relative to the rear base, making the upper isolator contact the top plate of the working surface; the telescopic end of the second hydraulic cylinder extends relative to the cylinder body, causing the lower isolator to move vertically downward relative to the rear base, making the lower isolator contact the bottom plate of the working surface; the rear chamber of the first hydraulic cylinder is closed by the second hydraulic control check valve, forming a sealed space in the rear chamber of the first hydraulic cylinder, ensuring that the telescopic end of the first hydraulic cylinder does not retract, so as to keep the upper isolator abutting against the top plate and not falling; when the top plate is soft or broken, the top plate releases pressure, the upper isolator continues to move upward, the pressure in the rear chamber of the first hydraulic cylinder decreases, and when the pressure value in the rear chamber of the first hydraulic cylinder sensed by the second pressure sensor reaches the set lower limit pressure value, the controller triggers the electro-hydraulic reversing valve to pressurize and replenish the fluid in the rear chamber of the first hydraulic cylinder; In each of steps 2 to 4, after the telescopic end of the push hydraulic cylinder extends out relative to the cylinder body end by a set coal mining step distance, the rear chamber of the push hydraulic cylinder is closed by the first hydraulic control check valve, forming a sealed space in the rear chamber of the push hydraulic cylinder to ensure that the telescopic end of the push hydraulic cylinder does not retract, so as to keep the rear base from moving in the direction of the front base; when the telescopic end of the push hydraulic cylinder extends out relative to the cylinder body end to switch the coal mining step distance, the pressure in the rear chamber of the push hydraulic cylinder decreases. When the pressure value in the rear chamber of the push hydraulic cylinder sensed by the first pressure sensor reaches the set lower limit pressure value, the controller triggers the electro-hydraulic reversing valve to pressurize and replenish the fluid in the rear chamber of the push hydraulic cylinder; During steps 1 to 4, the rear base, upper isolator and lower isolator seal the top plate and bottom plate of the working surface to fill the space, and paste filling operation is performed on the filling space; During steps 1 to 4, the front base and the top beam above it support the roof of the working face for mining operations. During steps 1 to 4, anchor bolts are used to support the top plate of the working face in the space between the front base and the rear base.

Images