A roadway support device for extra-thick loose coal seams

Abstract

The present invention belongs to the technical field of roadway support, and specifically relates to a roadway support device for extra-thick loose coal seams; it includes a bottom plate, a hydraulic jack, a support plate, a support board, a protective shell, a support mechanism, a self-locking mechanism and an unlocking mechanism; through the setting of the protective shell, the support mechanism, the self-locking mechanism and the unlocking mechanism, the present invention realizes the function that the support board adaptively fits the inclined surface of the roadway top within a certain range; effectively avoids the situation that the support board is difficult to fit the inclined roadway top surface, resulting in the formation of voids and weakening the support effect, thereby improving the safety and stability of the roadway; through the setting of the stabilizing mechanism, the function of stabilizing the support device is realized, and the normal use of the stabilizing plate during roadway support at different heights can be satisfied.

Description

Technical Field

[0001] The invention belongs to the technical field of roadway support, and particularly relates to a roadway support device for extra-thick loose coal seams. Background Art

[0002] An extra-thick loose coal seam roadway refers to a roadway with a large coal seam thickness, low coal body strength, developed fissures and easy swelling and deformation when encountering water. In order to ensure the stability and safety of the extra-thick loose coal seam roadway during tunneling and use, a roadway support device is usually used to effectively support and reinforce the extra-thick loose coal seam roadway.

[0003] When some existing roadway support devices are in use, they usually rely on a hydraulic jack to drive the support plate to contact the top of the roadway to achieve roadway support. However, when the shape of the top of the roadway is inclined, it is difficult for the support plate to fit the inclined roadway surface. In this case, a gap is easily formed between the support plate and the top of the roadway, resulting in a weakened support effect, increasing the risk of deformation or collapse of the top of the roadway, thus directly threatening the safety and stability of the roadway. Moreover, the gap is also likely to cause uneven stress distribution on the support plate, accelerating the process of its damage. Therefore, a roadway support device for extra-thick loose coal seams is proposed. Summary of the Invention

[0004] The invention overcomes the deficiencies of the prior art and provides a roadway support device for extra-thick loose coal seams; the invention is realized by the following technical solutions:

[0005] A roadway support device for extra-thick loose coal seams includes a bottom plate, a hydraulic jack and a support plate, and the hydraulic jack is installed between the bottom plate and the support plate; it also includes a support plate, a protective shell, a support mechanism, a self-locking mechanism and an unlocking mechanism; the support plate is arranged above the support plate; the protective shell is arranged on the lower surface of the support plate; the support mechanism is arranged between the support plate and the support plate;

[0006] The support mechanism includes a first support rod, a first ball joint connector, a second ball joint connector, a connecting rod, a third ball joint connector, a second support rod and a sliding plate; the first support rod is arranged on the upper surface of the middle part of the support plate, and a first ball joint connector is arranged at the upper end of the first support rod, and the first ball joint connector is connected to the middle part of the bottom surface of the support plate; second ball joint connectors are symmetrically arranged on both sides of the bottom surface of the support plate, a connecting rod is connected to the lower part of the second ball joint connector, a third ball joint connector is arranged at the end of the connecting rod far away from the second ball joint connector, a second support rod is arranged at the lower part of the third ball joint connector, the second support rod is slidably connected to the support plate, the bottom of the second support rod penetrates through the top of the protective shell and is slidably connected to the protective shell, a sliding plate is arranged at the bottom of the second support rod, the sliding plate is located in the protective shell and is slidably connected to the protective shell, a first spring is connected to the bottom of the sliding plate, and one end of the first spring far away from the sliding plate is fixedly connected to the protective shell;

[0007] The self-locking mechanism includes an inclined rack, a self-locking plate, and a second spring; the inclined rack is arranged inside the protective shell, two self-locking plates are slidably connected to the sliding plate, and one end of the self-locking plate is of an inclined surface structure, the inclined surface structure extends out of the sliding plate and cooperates with the tooth groove of the inclined rack, and a second spring is connected between the other end of the self-locking plate and the sliding plate;

[0008] The unlocking mechanism includes a slider, a resisting rod, a connecting rod, and a sliding plate; the slider is slidably connected to the protective shell, and the bottom of the slider is located outside the bottom of the protective shell; a resisting rod is arranged directly below the slider, the resisting rod is fixedly connected to the bottom plate, and when the slider moves downward, the bottom of the slider contacts the top of the resisting rod; a connecting rod is hinged to the side wall of the slider, one end of the connecting rod away from the slider is hinged to a sliding plate, and the sliding plate is slidably connected to the protective shell; a through hole is provided on the self-locking plate, and the sliding plate passes through the through hole.

[0009] Furthermore, a plurality of rib plates are arranged on the outer surface of the first support rod, and the plurality of rib plates are all fixedly connected to the support plate.

[0010] Furthermore, one side of the sliding plate is of a cavity structure, and the second spring is connected between the other end of the self-locking plate and the inner wall of the cavity structure.

[0011] Furthermore, a third spring is arranged on the upper surface of the slider, and one end of the third spring away from the slider is fixedly connected to the protective shell.

[0012] Furthermore, the sliding plate is of a U-shaped plate structure, the sliding plate includes a top plate, a bottom plate, and a vertical plate, and the vertical plate is connected between the bottom plate and the top plate; the connecting rod is hinged to the inner wall of the bottom plate of the sliding plate, the middle of the vertical plate of the sliding plate penetrates through the sliding plate, and the top plate of the sliding plate is located below the inner top of the protective shell; the vertical plate of the sliding plate passes through the through hole on the self-locking plate.

[0013] Furthermore, the slider, the resisting rod, the connecting rod, and the sliding plate are all made of polypropylene plastic.

[0014] Furthermore, a stabilizing mechanism is further included, and the stabilizing mechanism includes a stabilizing plate, a transmission rod, a transmission block, a support column, a transmission plate, and a connecting plate; a stabilizing plate is rotatably connected to each side of the bottom plate, the upper surface of the stabilizing plate is symmetrically hinged with a transmission rod at the front and back, one end of the transmission rod away from the stabilizing plate is hinged to a transmission block, a support column is slidably connected between the two transmission blocks on the same side, the support column is fixedly connected to the bottom plate, a transmission plate is arranged on the transmission block, the transmission plate is of an L-shaped structure, a chute is arranged along the whole length inside the transmission plate, a sliding block is connected to the bottom of the connecting plate, the connecting plate is slidably connected to the chute through the sliding block, and the top of the connecting plate is fixedly connected to the support plate.

[0015] Furthermore, the stabilizing plate is rotatably connected to the bottom plate through a hinge.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] 1. Through the settings of the protective shell, support mechanism, self-locking mechanism and unlocking mechanism, the present invention realizes the function that the support plate can adaptively fit the inclined surface at the top of the roadway within a certain range. During use, the support mechanism supports the support plate, and the self-locking mechanism locks the relevant structures in the support mechanism to prevent downward movement, thereby completing the support of the top of the roadway. After use, by the operation of the unlocking mechanism, the self-locking mechanism can be driven to operate, and the self-locking of the relevant structures in the support mechanism is released. At this time, the relevant structures in the support mechanism can be reset, and the support plate is restored to its initial horizontal state, effectively avoiding the situation that the support plate is difficult to fit the inclined surface at the top of the roadway, resulting in the formation of voids and weakening the support effect. Furthermore, the risk of deformation or collapse at the top of the roadway is reduced, thereby improving the safety and stability of the roadway. Moreover, during the support process, the stress borne by the support plate is uniform, and thus the durability of the support plate can be improved.

[0018] 2. Through the setting of the stabilizing mechanism, the present invention realizes the function of stabilizing the support device. During use, the stabilizing mechanism can be deployed as the support plate moves upward, causing the stabilizing plate in the stabilizing mechanism to rotate and contact the roadway ground, increasing the contact area between the device and the roadway ground, and further improving the stability of the device during use. After use, the stabilizing mechanism can be retracted as the support plate moves downward, causing the stabilizing plate in the stabilizing mechanism to rotate and return to its original position, reducing the overall volume of the device for the convenience of transporting the support device. During this process, through the setting of the transmission plate in the stabilizing mechanism, the normal use of the stabilizing plate can be ensured when supporting roadways of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present invention;

[0020] Figure 2 is the front view of the roadway support device for extra-thick loose coal seams of the present invention;

[0021] Figure 3 is Figure 2 the enlarged structural schematic diagram of area A in

[0022] Figure 4 is the sectional structural schematic diagram of the protective shell of the present invention;

[0023] Figure 5 is Figure 4 the enlarged structural schematic diagram of area B in

[0024] Figure 6 is Figure 4 the sectional structural schematic diagram of the sliding plate in

[0025] Figure 7 is Figure 6 the structural schematic diagram of the self-locking plate in

[0026] Figure 8 It is a structural schematic diagram of the stabilizing mechanism described in the present invention.

[0027] Description of the numbers in the figure:

[0028] 1. Base plate; 2. Hydraulic jack; 3. Support plate; 4. Support plate; 5. Protective shell; 6. Support mechanism; 61. Support rod one; 62. Ball connector one; 63. Ball connector two; 64. Connecting rod; 65. Ball connector three; 66. Support rod two; 67. Sliding plate; 68. Spring one; 7. Self-locking mechanism; 71. Bevel rack; 72. Self-locking plate; 73. Spring two; 8. Unlocking mechanism; 81. Sliding block; 82. Resistance rod; 83. Spring three; 84. Connecting rod; 85. Slide plate; 9. Stabilizing mechanism; 91. Stabilizing plate; 92. Transmission rod; 93. Transmission block; 94. Support column; 95. Transmission plate; 96. Connecting plate; 10. Rib plate. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0030] See also Figures 1 to 8 This embodiment provides a tunnel support device for a particularly thick loose coal seam, comprising a bottom plate 1, a hydraulic jack 2 and a support plate 3, wherein the hydraulic jack 2 is installed between the bottom plate 1 and the support plate 3; the tunnel support device also comprises:

[0031] A support plate 4, the support plate 4 is arranged above the support plate 3;

[0032] A protective shell 5, which is arranged on the lower surface of the supporting plate 3;

[0033] A support mechanism 6, the support mechanism 6 is arranged between the support plate 3 and the support plate 4;

[0034] A self-locking mechanism 7, which is arranged inside the protective shell 5;

[0035] An unlocking mechanism 8, the unlocking mechanism 8 is slidably disposed on the inner surface of the protective shell 5;

[0036] The stabilizing mechanism 9 is rotatably disposed on the outer surface of the bottom plate 1 , and the stabilizing mechanism 9 is fixedly connected to the support plate 3 .

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6and Figure 7 As shown in FIGS. and

[0038] , the support mechanism 6 includes a first support rod 61, a first ball head connector 62, a second ball head connector 63, a connecting rod 64, a third ball head connector 65, a second support rod 66, and a sliding plate 67. The first support rod 61 is disposed on the upper surface of the middle part of the support plate 3. A first ball head connector 62 is provided at the upper end of the first support rod 61, and the first ball head connector 62 is connected to the middle part of the bottom surface of the support plate 4. Second ball head connectors 63 are symmetrically arranged on both sides of the bottom surface of the support plate 4. A connecting rod 64 is connected to the lower part of the second ball head connector 63. A third ball head connector 65 is provided at the end of the connecting rod 64 away from the second ball head connector 63. A second support rod 66 is provided at the lower part of the third ball head connector 65. The second support rod 66 is slidably connected to the support plate 3. The bottom of the second support rod 66 penetrates through the top of the protective shell 5 and is slidably connected to the protective shell 5. A sliding plate 67 is provided at the bottom of the second support rod 66. The sliding plate 67 is located inside the protective shell 5 and is slidably connected to the protective shell 5. A first spring 68 is connected to the bottom of the sliding plate 67. One end of the first spring 68 away from the sliding plate 67 is fixedly connected to the inner bottom surface of the protective shell 5.

[0038] As Figure 1 shown Figure 2 in Figure 3 FIGS. ,

[0039] , Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 , and , a plurality of rib plates 10 are provided on the outer surface of the first support rod 61. The plurality of rib plates 10 are all fixedly connected to the support plate 3, which can increase the rigidity of the first support rod 61 and improve its stability.

[0039] As Figure 1 showninFIGS. Figure 2 , Figure 4 , Figure 6 , Figure 7 , ,

[0040] , Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , and Figure 7 , the self-locking mechanism 7 includes an inclined rack 71, a self-locking plate 72, and a second spring 73. The inclined rack 71 is disposed on the inner surface of the protective shell 5. One side of the sliding plate 67 is a cavity structure. Two self-locking plates 72 are slidably connected to the sliding plate 67, and one end of the self-locking plate 72 is a slope structure. The slope structure extends out of the sliding plate 67 and cooperates with the tooth groove of the inclined rack 71. A second spring 73 is connected between the other end of the self-locking plate 72 and the inner wall of the cavity structure.

[0040] As Figure 1 showninFIGS. Figure 2 , Figure 4 , Figure 5 , Figure 6 , and Figure 7 ​​​​​​​​​​​​​As shown, the unlocking mechanism 8 includes a slider 81 slidably arranged on the inner surface of the protective shell 5, and the bottom of the slider 81 is located outside the bottom of the protective shell 5; a contact rod 82 is arranged directly below the slider 81, and the bottom of the contact rod 82 is fixedly connected to the bottom plate 1. When the slider 81 moves downward, the bottom of the slider 81 can contact the top of the contact rod 82; a third spring 83 is arranged on the upper surface of the slider 81, and one end of the third spring 83 far from the slider 81 is fixedly connected to the protective shell 5. A connecting rod 84 is hinged on the side wall of the slider 81, and one end of the connecting rod 84 far from the slider 81 is hinged to a sliding plate 85, and the sliding plate 85 is slidably connected to the protective shell 5; specifically, the sliding plate 85 is in a U-shaped plate structure, and the sliding plate 85 includes a top plate, a bottom plate and a vertical plate, and the vertical plate is connected between the bottom plate and the top plate; the connecting rod 84 is hinged to the inner wall of the bottom plate of the sliding plate 85, the middle of the vertical plate of the sliding plate 85 penetrates through the sliding plate 67, and the top plate of the sliding plate 85 is located below the inner top of the protective shell 5. A through hole is provided in the middle of the self-locking plate 72, and the vertical plate passes through the through hole.

[0041] As Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the slider 81, the contact rod 82, the connecting rod 84 and the sliding plate 85 are made of polypropylene plastic, and have the characteristics of high hardness, light weight and corrosion resistance.

[0042] As Figure 1 , Figure 2 and Figure 8 As shown, the stabilizing mechanism 9 includes a stabilizing plate 91, a transmission rod 92, a transmission block 93, a support column 94, a transmission plate 95 and a connecting plate 96; a stabilizing plate 91 is rotatably connected to both sides of the bottom plate 1 respectively, the upper surface of the stabilizing plate 91 is symmetrically hinged with a transmission rod 92 at the front and back, one end of the transmission rod 92 far from the stabilizing plate 91 is hinged to a transmission block 93, a support column 94 is slidably connected between the inner surfaces of the two transmission blocks 93 on the same side, the support column 94 is fixedly connected to the bottom plate 1 through a column, a transmission plate 95 is arranged on the outer surface of the transmission block 93, the transmission plate 95 is in an L-shaped structure, a chute is arranged throughout the inside of the transmission plate 95, a sliding block is connected to the bottom of the connecting plate 96, and the connecting plate 96 is slidably connected to the chute through the sliding block, and the top of the connecting plate 96 is fixedly connected to the support plate 3. The transmission rod 92, the transmission block 93, the support column 94, the transmission plate 95 and the connecting plate 96 can disperse the stress points of the stabilizing plate 91, enhance the structural rigidity of the stabilizing plate 91, and further improve the stability of the contact between the stabilizing plate 91 and the ground.

[0043] As Figure 1 , Figure 2 and Figure 8 As shown, the stabilizing plate 91 is rotatably connected to the bottom plate 1 through a hinge, and the hinge has the characteristics of high firmness performance and small volume, so as to reduce the volume of the device and ensure the structural stability.

[0044] The working principle of a roadway support device for extra-thick loose coal seams proposed in this embodiment is as follows:

[0045] During use, the hydraulic jack 2 is started. The output end of the hydraulic jack 2 extends to drive the support plate 3 to move upward, causing the protective shell 5 and the support plate 4 to move upward. When one side corner of the support plate 4 contacts the inclined surface at the top of the roadway, the ball joint connector II 63, the connecting rod 64, the ball joint connector III 65, the support rod II 66, and the sliding plate 67 at this corner are stressed. At this time, one of the self-locking plates 72 on the sliding plate 67 at this corner cooperates with the tooth groove of the inclined rack 71 (through the elastic force of the spring II 73, the cooperation between this self-locking plate 72 and the tooth groove of the inclined rack 71 can be made stable), enabling the sliding plate 67 and the structures thereon to be self-locked and preventing downward movement. Subsequently, the ball joint connector I 62 on the support rod I 61 deflects, causing the ball joint connector II 63, the connecting rod 64, the ball joint connector III 65, the support rod II 66, and the sliding plate 67 at the other side corner of the support plate 4 to move upward. When the support plate 4 fits the inclined surface at the top of the roadway, one of the self-locking plates 72 on the sliding plate 67 at the other side corner of the support plate 4 cooperates with the tooth groove of the inclined rack 71 (through the elastic force of the spring II 73, the cooperation between this self-locking plate 72 and the tooth groove of the inclined rack 71 can be made stable), enabling the sliding plate 67 and the structures thereon to be self-locked and preventing downward movement, thereby completing the support of the roadway top.

[0046] After the support is completed, the hydraulic jack 2 is started. The output end of the hydraulic jack 2 contracts to drive the support plate 3 to move downward, causing the protective shell 5 and the support plate 4 to move downward. When the slider 81 on the protective shell 5 contacts the abutting rod 82 on the bottom plate 1, the slider 81 will move upward. At this time, the spring III 83 is compressed. The upward movement of the slider 81 drives the connecting rod 84 to move, and further drives the sliding plate 85 to move in the direction of the connecting rod 84. Then, the moving sliding plate 85 can push the self-locking plate 72 that cooperates with the tooth groove of the inclined rack 71 to move, completing the separation of the self-locking plate 72 from the tooth groove of the inclined rack 71 and releasing the self-locking state of the sliding plate 67. At this time, through the elastic force of the spring I 68, the sliding plate 67 and the structures thereon can be reset, and at this time, the support plate 4 can be horizontal; the ball joint connector I 62 on the support rod I 61 can also deflect and reset.

[0047] In the above process, when the output end of the hydraulic jack 2 extends to drive the support plate 3 to move upward, the connecting plate 96 can be driven to move upward. Then, when the connecting plate 96 moves upward, the transmission plate 95 can be driven to move, and further the transmission block 93 can be driven to move. Then, when the transmission block 93 moves, the transmission rod 92 can be driven to move, and further the stabilizing plate 91 can be driven to rotate and contact the ground of the roadway. When the stabilizing plate 91 rotates and contacts the ground of the roadway, the connecting plate 96 continues to move upward. At this time, the point where the connecting plate 96 is connected to the transmission plate 95 is located in the vertical chute of the transmission plate 95. Therefore, the transmission plate 95, the transmission block 93, and the transmission rod 92 will not change their positions, and the stability of the contact between the stabilizing plate 91 and the ground of the roadway can be ensured. At this time, the contact area between the device and the ground of the roadway increases, and thus the stability of the device can be improved. When the output end of the hydraulic jack 2 contracts to drive the support plate 3 to move downward, the connecting plate 96 will move downward synchronously with the support plate 3. When the point where the connecting plate 96 is connected to the transmission plate 95 moves out of the vertical chute of the transmission plate 95, the transmission plate 95 can be driven to move in the reverse direction, and further the transmission block 93 and the transmission rod 92 can be driven to move in the reverse direction. Then, by moving in the reverse direction, the stabilizing plate 91 can be driven to rotate and reset, reducing the volume of the device for convenient transportation of the device.

[0048] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the premise of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the patent protection scope determined by the claims submitted by the present invention.

Claims

1. A roadway support device for extra-thick loose coal seams, comprising a bottom plate (1), a hydraulic jack (2) and a support plate (3), wherein the hydraulic jack (2) is installed between the bottom plate (1) and the support plate (3); characterized in that, It further includes a support plate (4), a protective shell (5), a support mechanism (6), a self-locking mechanism (7) and an unlocking mechanism (8); the support plate (4) is arranged above the support plate (3); the protective shell (5) is arranged on the lower surface of the support plate (3); the support mechanism (6) is arranged between the support plate (3) and the support plate (4); The support mechanism (6) includes a first support rod (61), a first ball head connector (62), a second ball head connector (63), a connecting rod (64), a third ball head connector (65), a second support rod (66) and a sliding plate (67); the first support rod (61) is arranged on the upper surface of the middle part of the support plate (3), the upper end of the first support rod (61) is provided with the first ball head connector (62), and the first ball head connector (62) is connected to the middle part of the bottom surface of the support plate (4); the second ball head connectors (63) are symmetrically arranged on both sides of the bottom surface of the support plate (4), the lower part of the second ball head connector (63) is connected with the connecting rod (64), the end of the connecting rod (64) far away from the second ball head connector (63) is provided with the third ball head connector (65), the lower part of the third ball head connector (65) is provided with the second support rod (66), the second support rod (66) is slidably connected with the support plate (3), the bottom of the second support rod (66) penetrates through the top of the protective shell (5) and is slidably connected with the protective shell (5), the bottom of the second support rod (66) is provided with the sliding plate (67), the sliding plate (67) is located inside the protective shell (5) and is slidably connected with the protective shell (5), the bottom of the sliding plate (67) is connected with a first spring (68), and the end of the first spring (68) far away from the sliding plate (67) is fixedly connected with the protective shell (5); The self-locking mechanism (7) includes an inclined rack (71), a self-locking plate (72) and a second spring (73); the inclined rack (71) is arranged inside the protective shell (5), two self-locking plates (72) are slidably connected to the sliding plate (67), and one end of the self-locking plate (72) is of an inclined surface structure, the inclined surface structure extends out of the sliding plate (67) and cooperates with the tooth groove of the inclined rack (71), and a second spring (73) is connected between the other end of the self-locking plate (72) and the sliding plate (67); The unlocking mechanism (8) includes a slider (81), a contact rod (82), a connecting rod (84) and a sliding plate (85); the slider (81) is slidably connected to the protective housing (5), and the bottom of the slider (81) is located outside the bottom of the protective housing (5); a contact rod (82) is arranged directly below the slider (81), and the contact rod (82) is fixedly connected to the bottom plate (1). When the slider (81) moves downward, the bottom of the slider (81) contacts the top of the contact rod (82); a connecting rod (84) is hinged on the side wall of the slider (81), and one end of the connecting rod (84) away from the slider (81) is hinged to a sliding plate (85). The sliding plate (85) is a U-shaped plate structure and includes a top plate, a bottom plate and a vertical plate, and the vertical plate is connected between the bottom plate and the top plate; the connecting rod (84) is hinged to the inner wall of the bottom plate of the sliding plate (85), the middle of the vertical plate of the sliding plate (85) penetrates through the sliding plate (67), and the top plate of the sliding plate (85) is located below the inner top of the protective housing (5); a through hole is provided on the self-locking plate (72), and the vertical plate of the sliding plate (85) passes through the through hole on the self-locking plate (72).

2. The roadway support device for extra-thick loose coal seams according to claim 1, characterized in that, A plurality of rib plates (10) are arranged on the outer surface of the first support rod (61), and the plurality of rib plates (10) are all fixedly connected to the support plate (3).

3. The roadway support device for extra-thick loose coal seams according to claim 1, characterized in that, One side of the sliding plate (67) is a cavity structure, and the second spring (73) is connected between the other end of the self-locking plate (72) and the inner wall of the cavity structure.

4. The roadway support device for extra-thick loose coal seams according to claim 1, characterized in that A third spring (83) is arranged on the upper surface of the slider (81), and one end of the third spring (83) away from the slider (81) is fixedly connected to the protective housing (5).

5. The roadway support device for extra-thick loose coal seams according to claim 1, wherein, The slider (81), the contact rod (82), the connecting rod (84) and the sliding plate (85) are all made of polypropylene plastic.

6. The roadway support device for extra-thick loose coal seams according to claim 1, characterized in that, It further includes a stabilizing mechanism (9), and the stabilizing mechanism (9) includes a stabilizing plate (91), a transmission rod (92), a transmission block (93), a support column (94), a transmission plate (95) and a connecting plate (96); a stabilizing plate (91) is rotatably connected to each side of the bottom plate (1), the upper surface of the stabilizing plate (91) is symmetrically hinged with transmission rods (92) at the front and rear, one end of the transmission rod (92) away from the stabilizing plate (91) is hinged to a transmission block (93), a support column (94) is slidably connected between the two transmission blocks (93) on the same side, the support column (94) is fixedly connected to the bottom plate (1), the transmission block (93) is provided with a transmission plate (95), the transmission plate (95) is an L-shaped structure, a chute is arranged longitudinally inside the transmission plate (95), the bottom of the connecting plate (96) is connected with a sliding block, and the connecting plate (96) is slidably connected in the chute through the sliding block, and the top of the connecting plate (96) is fixedly connected to the support plate (3).

7. The roadway support device for extra-thick loose coal seams according to claim 6, wherein, The stabilizing plate (91) is rotatably connected to the bottom plate (1) through a hinge.

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