Thin seam working face mine pressure flexible supporting system

Abstract

The invention discloses a thin coal seam working face mine pressure flexible supporting system, and relates to the field of thin coal seam supporting. The supporting plate is connected to the tops of the left support and the right support. The two side supporting assemblies are symmetrically arranged on the front side and the rear side of the support; the yielding device is fixedly arranged in the bracket; the base is arranged at the bottom of the bracket; according to the device, through the synergistic effect of the side supporting assemblies and the yielding devices, V-shaped dynamic supporting is achieved; controllable yielding is achieved, self-adaptive conversion of flexible-rigid supporting is achieved, and the stability and safety of control over the top plate of the working face of the thin coal seam are improved.

Description

Technical Field

[0001] This invention relates to the field of thin coal seam support, specifically a flexible support system for thin coal seam working faces under mine pressure. Background Technology

[0002] Thin coal seam support is the core guarantee for maintaining roof stability, controlling surrounding rock deformation, and creating a safe working space for mining equipment and personnel. Existing mine pressure support for thin coal seam working faces mainly adopts rigid reaction support, which is prone to inducing or aggravating delamination and fracturing of thin coal seam working faces, resulting in roof falls and support collapse accidents. It also lacks an effective and controllable pressure relief function. Therefore, it is necessary to provide a flexible mine pressure support system for thin coal seam working faces to solve the above-mentioned technical problems. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a flexible support system for thin coal seam working faces under mine pressure, comprising:

[0004] The support frame is arranged symmetrically on both sides.

[0005] Support plates are connected and installed at the top of the left and right brackets;

[0006] Two side support components are symmetrically arranged on the front and rear sides of the bracket;

[0007] A pressure relief device is fixedly installed inside the bracket;

[0008] A base is disposed at the bottom of the bracket.

[0009] Furthermore, as a preferred embodiment, the support includes a movable frame and a base frame distributed vertically, the base frame having a first positioning groove and the movable frame having a second positioning groove.

[0010] Further, preferably, the side support assembly includes:

[0011] The first support arm has one end hinged to the movable frame end;

[0012] The second support arm has one end hinged to the top of the base frame;

[0013] The other end of the first support arm and the other end of the second support arm are hinged together by a connector.

[0014] The piston rod has one end hinged to the middle of the base frame and the other end hinged to the side of the first support arm near the connector.

[0015] Further, preferably, the pressure relief device includes:

[0016] A buffer block has a first positioning key on both sides, and the first positioning key is set in the second positioning groove;

[0017] The base has second positioning keys on both sides, and the second positioning keys are disposed in the first positioning groove;

[0018] A pressure relief pump is disposed between the buffer block and the base. The pressure relief pump includes a piston block, which is disposed at the bottom of the buffer block and embedded in the pump chamber. The pump chamber is disposed at the top of the base.

[0019] The pump chamber is provided with a pressure relief hole at the bottom, and the pressure relief hole is equipped with a pressure relief valve.

[0020] Furthermore, as a preferred embodiment, the base includes a positioning frame, the positioning frame is provided with a drive chamber, and locking chambers are symmetrically provided on both sides of the drive chamber;

[0021] The drive chamber is equipped with a hydraulic motor, the inlet of which is connected to the pressure relief hole. The locking chamber is equipped with a locking assembly, which is connected to the output shaft of the hydraulic motor.

[0022] Further, preferably, the locking component includes:

[0023] The first drive shaft has one end connected to the output shaft of the hydraulic motor and the other end provided with a first gear;

[0024] The second drive shaft has second gears symmetrically arranged on both sides, the second gears meshing with the first gear, and a first bevel gear arranged on one side of the second gear. The second drive shaft has second bevel gears symmetrically arranged on both sides, and the second bevel gears are rotatably mounted on the side wall of the positioning frame.

[0025] The second drive shaft is provided with a slide rail, and the slide rail is provided with a groove in the middle. The slide rail is disposed between the first bevel gear and the second bevel gear.

[0026] A wedge block is slidably disposed on the slide rail, and a plurality of elastic elements are disposed between the wedge block and the first bevel gear;

[0027] The third bevel gear is rotatably mounted at the bottom of the positioning frame and meshes between the first bevel gear and the second bevel gear.

[0028] Furthermore, preferably, the second bevel gear is provided with a plurality of limiting blocks corresponding to the wedge block.

[0029] Furthermore, as a preferred embodiment, the wedge includes a limiting plate, one side of which is connected to the elastic member, and a locking plate is provided on the other side of the limiting plate. A centrifugal clamp is provided between the locking plate and the limiting plate, and the centrifugal clamp is disposed in the slot.

[0030] Compared with the prior art, the present invention provides a flexible support system for thin coal seam working faces under mine pressure, which has the following beneficial effects:

[0031] This device achieves V-shaped dynamic support through the coordinated action of the side support components and the pressure relief device. The side support components can independently respond to changes in coal seam edge pressure, while the pressure relief device, through the cooperation of buffer blocks, pressure relief pumps and adaptive locking components, not only achieves controllable pressure relief when the central coal seam pressure changes, but also can quickly and rigidly lock when the coal seam pressure increases suddenly or rock bursts occur, preventing excessive softening from causing instability.

[0032] This device enables adaptive switching between "flexible" and "rigid" support in low and narrow spaces, improving the stability and safety of roof control in thin coal seam working faces and fundamentally reducing the risk of roof fall and roof collapse accidents. Attached Figure Description

[0033] Figure 1 A schematic diagram of the overall structure of a flexible support system for thin coal seam working faces under mine pressure.

[0034] Figure 2 This is a structural schematic diagram of the side support assembly;

[0035] Figure 3 A schematic diagram of the overall structure of the pressure relief device;

[0036] Figure 4 A cross-sectional view of the pressure relief device;

[0037] Figure 5 This is a schematic diagram of the locking assembly.

[0038] Figure 6 This is a schematic diagram of the structure of the second drive shaft and the wedge block;

[0039] Figure 7 This is a schematic diagram of the conversion structure of the locking component.

[0040] In the diagram: 1. Bracket; 11. Base frame; 111. First positioning groove; 12. Movable frame; 121. Second positioning groove; 2. Support plate; 21. Center plate; 22. Side plate; 3. Side support assembly; 31. First support arm; 32. Connector; 33. Second support arm; 34. Piston rod; 4. Base; 5. Pressure relief device; 51. Buffer block; 511. First positioning key; 52. Base; 521. Hydraulic motor; 522. Second positioning key; 523. Positioning frame; 53. Pressure relief pump; 531. Piston block; 532. Pump chamber; 533. Pressure regulating valve; 6. Locking assembly; 61. First drive shaft; 62. Second drive shaft; 621. Slide rail; 622. Slot; 63. First gear; 64. Second gear; 65. First bevel gear; 66. Wedge block; 661. Locking plate; 662. Centrifugal clamp; 663. Limiting plate; 67. Elastic element; 68. Second bevel gear; 681. Limiting block; 69. Third bevel gear. Detailed Implementation

[0041] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a distinguishing method used to describe objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0042] Example: Please refer to Figures 1-7 In this embodiment of the invention, a flexible support system for thin coal seam working faces under mine pressure is provided, comprising:

[0043] Support 1 is arranged symmetrically on both sides;

[0044] Support plate 2, which is connected and disposed on the top of the left and right brackets 1;

[0045] Two side support components 3 are symmetrically arranged on the front and rear sides of the bracket 1;

[0046] The pressure relief device 5 is fixedly installed inside the bracket 1;

[0047] The base 4 is located at the bottom of the bracket 1.

[0048] It should be noted that, please refer to Figure 1The support plate 2 is divided into a center plate 21 and a side plate 22. The center plate 21 and the side plate 22 work together to enhance the adaptability of this device to the support of irregular coal seam working faces.

[0049] In practical implementation, the side support component 3 and the pressure relief device 5 cooperate to provide V-shaped support for the coal seam working face, providing dynamically adjustable support in the low and narrow mining space. When the mining pressure at the edge of the coal seam working face changes, the corresponding side support component 3 can independently adapt to the change in coal seam mining pressure, and the dynamic balance maintained by the device for the other coal seam working faces will not be affected. When the mining pressure in the middle of the coal seam working face changes, the pressure relief device 5 can pull the side support component 3 to contract or extend according to the change in mining pressure, so as to improve the stability of the coal seam working face.

[0050] In this embodiment, please refer to Figure 2 The support 1 includes a movable frame 12 and a base frame 11 distributed vertically. The base frame 11 is provided with a first positioning groove 111, and the movable frame 12 is provided with a second positioning groove 121.

[0051] Further, please refer to Figure 2 The side support assembly 3 includes:

[0052] The first support arm 31 has one end hinged to the end of the movable frame 12;

[0053] The second support arm 33 has one end hinged to the top of the base frame 11;

[0054] The other end of the first support arm 31 and the other end of the second support arm 33 are hinged together by a connector 32.

[0055] The piston rod 34 has one end hinged to the middle of the base frame 11 and the other end hinged to the side of the first support arm 31 near the connector 32.

[0056] In practice, when the mining pressure at the edge of the coal seam working face increases, the piston rod 34 is compressed, pulling the first support arm 31 and the second support arm 33 downward, giving way to the support as the coal seam working face sinks.

[0057] It should be noted that the piston rod 34 is provided with a compression threshold. When the coal seam working face supported by the side support component 3 reaches the threshold, the support state of the side support component 3 changes from flexible to rigid to prevent the thin coal seam working face from collapsing due to excessive displacement.

[0058] Further, please refer to Figure 3 , Figure 4 The pressure relief device 5 includes:

[0059] The buffer block 51 has a first positioning key 511 on both sides, and the first positioning key 511 is disposed in the second positioning groove 121;

[0060] The base 52 has second positioning keys 522 on both sides, and the second positioning keys 522 are disposed in the first positioning groove 111;

[0061] A pressure relief pump 53 is disposed between the buffer block 51 and the base 52. The pressure relief pump 53 includes a piston block 531, which is disposed at the bottom of the buffer block 51 and embedded in the pump chamber 532. The pump chamber 532 is disposed at the top of the base 52.

[0062] The pump chamber 532 is provided with a pressure relief hole at the bottom, and the pressure relief hole is provided with a pressure relief valve 533. It should be noted that the pressure relief valve 533 is provided with a pressure threshold. When the pressure in the pump chamber 532 is greater than or equal to the pressure threshold of the pressure relief valve 533, the pressure relief valve 533 opens and the pressure relief device 5 enters the pressure relief state.

[0063] In specific implementation, when the mine pressure in the middle of the coal seam working face increases, the buffer block 51 sinks as the coal seam working face deforms, the piston block 531 compresses the pump chamber 532, the pressure relief valve 533 opens, and the pump fluid is discharged from the pressure relief valve 533. When the pressure in the pump chamber 532 drops to the pressure threshold of the pressure relief valve 533, the pressure relief device 5 stops.

[0064] Furthermore, the base 52 includes a positioning frame 523, the positioning frame 523 is provided with a drive chamber, and locking chambers are symmetrically provided on both sides of the drive chamber;

[0065] The drive chamber is equipped with a hydraulic motor 521, the inlet of which is connected to the pressure relief hole. The locking chamber is equipped with a locking component 6, which is connected to the output shaft of the hydraulic motor 521.

[0066] It should be noted that when the coal seam working face experiences a sudden increase in mine pressure and an instantaneous shock pressure occurs, and the pressure-relief flexible support cannot adapt to the coal seam impact, the locking component 6 can immediately cut off the uncontrollable pressure relief process, and prevent the device from failing due to drastic changes by rigidly locking it, thus preventing the system from losing its basic support function and stability due to excessive flexibility.

[0067] In practical implementation, the hydraulic motor 521 has two working states: low speed and high speed, due to the difference in pump fluid flow rate. When the mine pressure at the coal seam working face changes relatively steadily, the pump fluid flow rate discharged along the pressure relief valve 533 is relatively slow, and the hydraulic motor 521 is in a low-speed operating state. When the mine pressure at the coal seam working face changes more drastically, the pump fluid discharge flow rate increases, and the hydraulic motor 521 switches from low-speed operation to high-speed operation.

[0068] Further, please refer to Figure 5 , Figure 6 The locking component 6 includes:

[0069] The first drive shaft 61 has one end connected to the output shaft of the hydraulic motor 521 and the other end is provided with a first gear 63.

[0070] The second drive shaft 62 has second gears 64 symmetrically arranged on both sides. The second gears 64 mesh with the first gear 63, and a first bevel gear 65 is arranged on one side of the second gear 64. The second drive shaft 62 has second bevel gears 68 symmetrically arranged on both sides. The second bevel gears 68 are rotatably mounted on the side wall of the positioning frame 523.

[0071] The second drive shaft 62 is provided with a slide rail 621, and the slide rail 621 is provided with a slot 622 in the middle. The slide rail 621 is disposed between the first bevel gear 65 and the second bevel gear 68.

[0072] A wedge 66 is slidably disposed on the slide rail 621, and a plurality of elastic elements 67 are disposed between the wedge 66 and the first bevel gear 65.

[0073] The third bevel gear 69 is rotatably disposed at the bottom of the positioning frame 523, and the third bevel gear 69 meshes between the first bevel gear 65 and the second bevel gear 68.

[0074] It should be noted that the transmission ratio between the first gear 63 and the second gear 64 determines the locking response speed of the locking component 6. The transmission ratio can be adjusted according to the actual usage conditions so that the locking component 6 can accurately switch between the depressurized state and the locking state. The elastic element 67 is initially in the compressed state.

[0075] Furthermore, the second bevel gear 68 is provided with a plurality of limiting blocks 681 corresponding to the wedge block 66.

[0076] In this embodiment, the wedge 66 includes a limiting plate 663. One side of the limiting plate 663 is connected to the elastic member 67, and a locking plate 661 is provided on the other side of the limiting plate 663. A centrifugal clamp 662 is provided between the locking plate 661 and the limiting plate 663, and the centrifugal clamp 662 is disposed in the slot 622.

[0077] Please refer to the following for specific implementation: Figure 7 The locking component 6 includes the following operating states:

[0078] a. In the pressure relief state, when the hydraulic motor 521 is in a low-speed state, the first gear 63 rotates at a slower speed, driving the second transmission shaft 62 to rotate. During this process, the centrifugal force on the centrifugal clamp 662 in the wedge 66 is insufficient to disengage the centrifugal clamp 662 from the slot 622. Therefore, the wedge 66 will not engage and lock with the second bevel gear 68, and the pressure relief device 5 maintains the pressure relief state.

[0079] b. In the locked state, when the hydraulic motor 521 switches to high speed, the first gear 63 rotates faster, and the centrifugal force on the centrifugal clamp 662 reaches the release threshold. The elastic element 67 pushes the wedge block 66 to slide outward along the slide rail 621, eventually engaging with the second bevel gear 68. It should be noted that in the unloaded state, the second bevel gear 68 rotates in the opposite direction to the first bevel gear 65. When the wedge block 66 engages with the second bevel gear 68, the second bevel gear 68 rotates in the same direction as the first bevel gear 65. Under the transmission of the wedge block 66 and the third bevel gear 69, the rotation of the second bevel gear 68 conflicts, so the locking component 6 locks.

[0080] It should be noted that when the locking component 6 is locked, the device changes from flexible pressure relief support to rigid support. After the support work of the device is completed, manual intervention is required to push the wedge 66 back into the slot 622, and the elastic element 67 is reset to the compressed state.

[0081] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flexible support system for thin coal seam working faces under mine pressure, characterized in that, include: The bracket (1) is arranged symmetrically on the left and right sides; Support plate (2), which is connected to the top of the left and right brackets (1); Two side support components (3) are symmetrically arranged on the front and rear sides of the bracket (1); The pressure relief device (5) is fixedly installed inside the bracket (1); The base (4) is located at the bottom of the bracket (1).

2. The flexible support system for thin coal seam working faces under mine pressure according to claim 1, characterized in that, The support (1) includes a movable frame (12) and a base frame (11) distributed vertically. The base frame (11) is provided with a first positioning groove (111), and the movable frame (12) is provided with a second positioning groove (121).

3. The flexible support system for thin coal seam working faces under mine pressure according to claim 2, characterized in that, The side support assembly (3) includes: The first support arm (31) has one end hinged to one end of the movable frame (12); The second support arm (33) is hinged at one end to the top of the base frame (11); The other end of the first support arm (31) and the other end of the second support arm (33) are hinged together by a connector (32); The piston rod (34) has one end hinged to the middle of the base frame (11) and the other end hinged to the side of the first support arm (31) near the connector (32).

4. The flexible support system for thin coal seam working faces under mine pressure according to claim 2, characterized in that, The pressure relief device (5) includes: A buffer block (51) has a first positioning key (511) on both sides, and the first positioning key (511) is located in the second positioning groove (121); The base (52) has second positioning keys (522) on both sides, and the second positioning keys (522) are disposed in the first positioning groove (111); A pressure relief pump (53) is disposed between the buffer block (51) and the base (52). The pressure relief pump (53) includes a piston block (531), which is disposed at the bottom of the buffer block (51) and embedded in the pump chamber (532). The pump chamber (532) is disposed at the top of the base (52). The pump chamber (532) is provided with a pressure relief hole at the bottom, and the pressure relief hole is provided with a pressure relief valve (533).

5. A flexible support system for thin coal seam working faces under mine pressure according to claim 4, characterized in that, The base (52) includes a positioning frame (523), the positioning frame (523) is provided with a drive chamber, and locking chambers are symmetrically provided on both sides of the drive chamber; The drive chamber is equipped with a hydraulic motor (521), the inlet of the hydraulic motor (521) is connected to the pressure relief hole, the locking chamber is equipped with a locking component (6), and the locking component (6) is connected to the output shaft of the hydraulic motor (521).

6. A flexible support system for thin coal seam working faces under mine pressure according to claim 5, characterized in that, The locking component (6) includes: The first drive shaft (61) has one end connected to the output shaft of the hydraulic motor (521) and the other end is provided with a first gear (63). The second drive shaft (62) has a second gear (64) symmetrically arranged on both sides. The second gear (64) meshes with the first gear (63). A first bevel gear (65) is arranged on one side of the second gear (64). A second bevel gear (68) is symmetrically arranged on both sides of the second drive shaft (62). The second bevel gear (68) is rotatably mounted on the side wall of the positioning frame (523). The second drive shaft (62) is provided with a slide rail (621), and the slide rail (621) is provided with a slot (622) in the middle. The slide rail (621) is located between the first bevel gear (65) and the second bevel gear (68). A wedge (66) is slidably disposed on the slide rail (621), and a plurality of elastic elements (67) are disposed between the wedge (66) and the first bevel gear (65). The third bevel gear (69) is rotatably disposed at the bottom of the positioning frame (523), and the third bevel gear (69) meshes between the first bevel gear (65) and the second bevel gear (68).

7. A flexible support system for thin coal seam working faces under mine pressure according to claim 6, characterized in that, The second bevel gear (68) is provided with a plurality of limiting blocks (681) corresponding to the wedge (66).

8. A flexible support system for thin coal seam working faces under mine pressure according to claim 7, characterized in that, The wedge (66) includes a limiting plate (663), one side of which is connected to the elastic member (67), and the other side of which is provided with a locking plate (661). A centrifugal clamp (663) is provided between the locking plate (661) and the limiting plate (663), and the centrifugal clamp (663) is provided in the slot (622).

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