Downhole advance support device

Abstract

The present application relates to the technical field of coal seam advanced support, in particular to an underground advanced support device, which comprises a support assembly, an outward expansion part, a turnover limiting part, a support mechanism body and a support plate on the top of the support mechanism body for supporting the coal seam, the two side support plates are attached to each other in the extension direction of the support body, the inner side of the support plate is provided with the support assembly, the support assembly is pivotally connected with the outward expansion part, the two sides of the support assembly in the width direction of the support body are provided with the outward expansion part, at least one end of the outward expansion part in the extension direction of the support body is provided with the turnover limiting part, and the turnover limiting part is rotatable relative to the outward expansion part. The underground advanced support device can avoid the direct impact of flying gangue on the working area below the support, and improve the safety of the support work.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam advance support, and in particular to an underground advance support device. Background Art

[0002] Coal mine advance support is an auxiliary measure taken ahead of the face excavation to ensure the stability of the coal mine excavation working face. Hydraulic supports are often used for support. When the coal mine is excavating, it is generally necessary to stop the machine, withdraw and carry out anchor support operations after one step of excavation.

[0003] Specifically, when moving forward, the front support column is lowered and separated from the top plate, and the push cylinder is extended. After the front support is moved forward to the right position, the column is raised to make the support top beam contact the top, and then the rear support column is lowered and separated from the top plate, and the push jack is retracted to make the rear support move forward. Through this cycle, alternating steps are achieved. However, during the descent of the front support, the front support of the next position is still in a supporting state, which will cause a gap to be generated between the front support and the front support of the next position. At this time, due to the lack of support above the front support, the coal falling from the top will fall directly into the working area through the gap, generating flying gangue, thereby affecting the normal operation of machines and workers in the working area. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides an underground advance support device that can prevent flying gangue from directly impacting the working area below the support, thereby improving the safety of the support work.

[0005] The underground advance support device according to the embodiment of the present invention includes:

[0006] The support mechanism body and the support plate on the top of the support mechanism body are used to support the coal seam, and the support plates on both sides are attached to each other in the extension direction of the support mechanism body;

[0007] A support assembly, an outward expansion portion and a flip limit portion, wherein a support assembly is provided on the inner side of the support plate, the support assembly is pivotally connected to the outward expansion portion, and the support assembly is provided with outward expansion portions on both sides of the width direction of the support body, and the outward expansion portion is provided with a flip limit portion at at least one end in the extension direction of the support body, and the flip limit portion is rotatable relative to the outward expansion portion.

[0008] The underground advanced support device of the embodiment of the present invention can prevent flying gangue from directly impacting the working area below the support, thereby improving the safety of the support work.

[0009] In some embodiments, the outward expansion portion includes an outward expansion inclined plate and an inclined tie rod rotatably connected to the outward expansion inclined plate, and a side of the outward expansion inclined plate adjacent to the support plate is in the shape of an inclined surface.

[0010] In some embodiments, an auxiliary collar is further included, wherein the auxiliary collar is threadedly connected to the support assembly and the auxiliary collar moves in the height direction of the support mechanism body.

[0011] The auxiliary collar is pivotally connected to a diagonal rod at each end in the width direction of the support body.

[0012] The auxiliary collar is fixedly connected to a limit block for limiting the clockwise rotation of the diagonal tie rod, so as to limit the rotation angle of the diagonal tie rod.

[0013] In some embodiments, the support assembly includes a support frame body, a first screw rod and a second screw rod, the first screw rod is fixedly connected to one end of the support frame body, the first screw rod is threadedly connected to the second screw rod sleeved on the outside, the second screw rod is threadedly connected to the auxiliary ring, and the top end of the second screw rod is rotatably connected to the inner wall of the support plate.

[0014] In some embodiments, the support assembly further includes a support pole and a first spring. The other end of the support frame is slidably connected to the support pole. The top end of the support pole is fixedly connected to the support plate of the next position. The bottom of the support pole is covered with a first spring.

[0015] In some embodiments, the flip limiting portion includes a flip limiting plate and a traction rope that are rotatably connected to the inclined surface of the outward expansion inclined plate. A resistance plate is provided on the inner side of the flip limiting plate. The flip limiting plate is rotatably connected to the outward expansion inclined plate through a rotating shaft. A traction rope is wrapped around the rotating shaft. The other end of the traction rope is wrapped around the shaft rod at the rotatable connection between the outward expansion inclined plate and the outward expansion inclined plate.

[0016] In some embodiments, a protective device for limiting the impact of coal on the support plate is further provided on the outside of the outward-expanding inclined plate. The protective device includes a protective plate, which is fan-shaped and located in the discharge channel, and the protective plate is inclined upward at the coal discharge port.

[0017] In some embodiments, the protective device includes a damper and a second spring. The damper is fixedly connected to one end of the inner side of the protective plate, and the other end of the damper is fixed on the diagonal rod. The second spring sleeved on the damper is respectively against the protective plate and the diagonal rod.

[0018] In some embodiments, when the flip limit plate flips inwardly and becomes perpendicular to the outwardly expanding inclined plate, the friction plate on the inner side of the flip limit plate contacts the side edge of the protective plate.

[0019] In some embodiments, a flame retardant buffer plate is further included, and a flame retardant buffer plate is provided on one end surface of the outwardly expanding inclined plate adjacent to the support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Schematic diagram of an underground advance support device according to an embodiment of the present invention.

[0021] Figure 2 It is a front view of the support plate, support frame, protective plate and expansion part structure of the present invention.

[0022] Figure 3 It is a rear view of the support plate, support frame, protective plate and flip limiter structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the explosion structure of the protective plate, outward-expanding inclined plate and supporting frame of the present invention.

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the first screw rod and the second screw rod of the present invention.

[0025] Figure 6 It is a schematic diagram of the connection structure of the protective plate, the second spring and the damper with the inclined rod of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the flip limit plate, traction rope, outward-expanding inclined plate and inclined rod of the present invention.

[0027] Reference numerals:

[0028] Support mechanism body 100, support plate 101, support frame 102, first spring 103, support rod 104, first screw rod 105, second screw rod 106,

[0029] Protective plate 110, second spring 111, damper 112,

[0030] Auxiliary collar 120, limit block 121,

[0031] Outward expansion part 200, outward expansion inclined plate 201, inclined tie rod 202,

[0032] Flip limiting part 300 , flip limiting plate 301 , traction rope 302 . DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention. Figures 1 to 7 As shown, the underground advance support device of the embodiment of the present invention includes: a support mechanism body 100, a support plate 101, a support assembly, an outward expansion portion 200 and a flip limit portion 300, and a support plate 101 on the top of the support mechanism body 100 for supporting the coal seam. The support plates 101 on both sides are attached to each other in the extension direction of the support body.

[0034] The support plate 101 is internally provided with a support assembly, which is pivotally connected with the outward expansion part 200, and the support assembly is provided with the outward expansion part 200 on both sides in the width direction of the support body, and the outward expansion part 200 is provided with a turnover limiting part 300 at least at one end in the extension direction of the support body, and the turnover limiting part 300 is rotatable relative to the outward expansion part 200.

[0035] The extension direction of the support body is the front-rear direction, the height direction of the support body is the up-down direction, and the width direction of the support body is the left-right direction. The support mechanism body 100 can be an existing support device such as a hydraulic prop.

[0036] Specifically, the support mechanism body 100 and the support plate 101 on the top of the support mechanism body 100 for supporting the coal seam, when supporting the coal seam above, the support plate 101 on both sides is adhered to each other, and the support mechanism body 100 at the bottom provides support for the support plate 101, facilitating the normal operation of the machine at the bottom of the support plate 101. On the other hand, the support plate 101 is internally provided with a support assembly, which is used when the support plate 101 at the previous position is lowered (the support plate 101 at the next position is still adhered to the coal seam, at this time, a gap is generated between the support plate 101 at the previous position and the next position, thereby causing the coal above to fall off, hereinafter referred to as gap), the outward expansion part 200 provided on the support assembly is extended outward, and the outward expansion part 200 is arranged on both sides of the support assembly, thereby supporting the left and right brightness of the support plate 101.

[0037] A discharging channel is formed between the outward expansion part 200 and the support plate 101, so that the coal falling off between the adjacent support plates 101 slides to the bottom end inside the support plate 101 along the discharging channel, and in the process of the outward expansion of the outward expansion part 200, the turnover limiting part 300 provided at the end is rotated inward by the outward expansion part 200, and the turnover limiting part 300 blocks the coal falling onto the outward expansion part 200, thereby limiting the coal from falling off from the side of the outward expansion part 200.

[0038] When the support plate 101 at the previous position is lowered, the outward expansion part 200 is extended outward, reducing the distance between the coal falling off and the outward expansion part 200, so that the potential energy of the coal falling onto the outward expansion part 200 is reduced, thereby protecting the outward expansion part 200, and in the process of the outward expansion of the outward expansion part 200, the outward expansion part 200 drives the turnover limiting part 300 to rotate the turnover limiting part 300 to be perpendicular to the outward expansion part 200, so as to limit the coal falling off from the gap, prevent the coal from sliding off from the side of the outward expansion part 200, that is, avoid the gangue or coal from sliding off from both sides of the outward expansion part 200 in the front-rear direction, but let the gangue or coal slide off from both sides of the outward expansion part 200 in the left-right direction, as far as possible to avoid affecting the machine at the bottom.

[0039] The underground advance support device of an embodiment of the present invention prevents coal from sliding out from the side of the expansion part 200 by providing the expansion part 200 and the flip limit part 300, that is, prevents gangue or coal from sliding from both sides of the front and rear directions of the expansion part 200, but allows gangue or coal to slide from the left and right sides of the expansion part 200, thereby avoiding the impact on the bottom machine as much as possible, preventing flying gangue from directly impacting the working area below the support, and improving the safety of the support work.

[0040] In some embodiments, the outward expansion portion 200 includes an outward expansion inclined plate 201 and an inclined tie rod 202 rotatably connected to the outward expansion inclined plate 201 . The side of the outward expansion inclined plate 201 adjacent to the support plate 101 is in the shape of an inclined surface.

[0041] Specifically, in order to reduce the potential energy of coal and reduce the impact of coal on the expansion part 200, an expansion inclined plate 201 and an inclined rod 202 rotatably connected to the expansion inclined plate 201 are provided. The inclined rod 202 is rotatably connected to the expansion inclined plate 201.

[0042] The inclined tie rod 202 is rotatably connected to the auxiliary collar 120, and the outer expansion inclined plate 201 is inclined at the top and vertical at the bottom, thereby guiding the falling gangue or coal. When the gangue hits the outer expansion inclined plate 201, the potential energy of the coal decreases, reducing the falling speed of the gangue or coal.

[0043] In some embodiments, an auxiliary collar 120 is further included. The auxiliary collar 120 is threadedly connected to the support assembly and moves in the height direction of the support mechanism body 100.

[0044] The auxiliary collar 120 is pivotally connected to a diagonal rod 202 at each end in the width direction of the support body.

[0045] The auxiliary collar 120 is fixedly connected to a limit block 121 for limiting the clockwise rotation of the diagonal brace 202 to limit the rotation angle of the diagonal brace 202 .

[0046] Specifically, an auxiliary collar 120 is provided at one end of the inclined rod 202 away from the rotational connection with the outward expansion inclined plate 201. One end of the auxiliary collar 120 is pivotally connected to the inclined rod 202 of one outward expansion portion 200. One end of the auxiliary collar 120 is pivotally connected to the inclined rod 202 of the other outward expansion portion 200. That is, the auxiliary collar 120 is pivotally connected to the outward expansion portions provided on the left and right sides of the support assembly. The auxiliary collar 120 moves in the height direction of the support mechanism body 100 to drive the rotation of the inclined rod 202. The rotation of the inclined rod 202 pushes the lower end of the outward expansion inclined plate 201 upward or downward, causing the outward expansion inclined plate 201 to extend outward or retract inward. For example, while the outward expansion inclined plate 201 is raised as a whole, the angle at which fallen coal slides along the inclined surface of the outward expansion inclined plate 201 is reduced, thereby reducing the potential energy of the fallen coal and protecting the support plate 101.

[0047] In some embodiments, the support assembly includes a support frame body 102, a first screw rod 105 and a second screw rod 106, the first screw rod 105 is fixedly connected to one end of the support frame body 102, the first screw rod 105 is threadedly connected to the second screw rod 106 sleeved on the outside, the second screw rod 106 is threadedly connected to the auxiliary ring 120, and the top end of the second screw rod 106 is rotatably connected to the inner wall of the support plate 101.

[0048] Specifically, the support assembly consists of a support frame 102, a first screw rod 105, and a second screw rod 106. The first screw rod 105, which is fixedly connected to one end of the support frame 102, is threadedly connected to the second screw rod 106 sleeved on the outside. The second screw rod 106 is threadedly connected to the auxiliary ring 120, and the top end of the second screw rod 106 is rotatably connected to the inner wall of the support plate 101. In addition, the other end of the support frame 102 is slidably connected to the support vertical rod 104. The top end of the support vertical rod 104 is fixedly connected to the support plate 101 at the next level. The bottom of the support vertical rod 104 is sleeved with a first spring 103. In this way, when the support plate 101 at the previous level descends, the support frame 102 and the support plate 101 move downward together. At this time, the support frame 102 compresses the first spring 103, and a gap is generated between the two support plates 101, and the coal above falls along the gap.

[0049] In order to reduce the potential energy of coal and reduce the impact of coal on the expansion part 200, the structure of the expansion part 200 is disclosed. The expansion part 200 includes an expansion inclined plate 201 and an inclined rod 202 rotatably connected to the expansion inclined plate 201. The inclined rod 202 is rotatably connected to the expansion inclined plate 201.

[0050] The inclined brace 202 is rotatably connected to the auxiliary collar 120. The outer expansion inclined plate 201 is inclined at the top and vertical at the bottom. Furthermore, an auxiliary collar 120 is provided at one end of the inclined brace 202, away from the rotational connection with the outer expansion inclined plate 201. This allows the second screw rod 106 to rotate under the action of the first screw rod 105, and the auxiliary collar 120 to move downward along the second screw rod 106. This pushes the outer expansion inclined plate 201 outward through the inclined brace 202, causing it to extend outward. This raises the outer expansion inclined plate 201 as a whole, reducing the angle at which fallen coal slides along the inclined surface of the outer expansion inclined plate 201, thereby reducing the potential energy of the fallen coal and protecting the support plate 101.

[0051] It should be noted that: in order to prevent the outward-expanding inclined plates 201 on both sides from rotating along the rotating connection with the support frame body 102 when the second screw rod 106 does not rotate under normal circumstances, which will cause the upward flipping angle of the protective plate 110 to decrease, therefore, the two ends of the auxiliary collar 120 are fixedly connected with limit blocks 121 for limiting the clockwise rotation of the diagonal rod 202. When the outward-expanding inclined plates 201 have not yet extended outward, the limit blocks 121 can be used to limit the rotation between the diagonal rod 202 and the auxiliary collar 120 under the action of gravity, thereby maintaining the initial state of the diagonal rod 202.

[0052] In some embodiments, the support assembly also includes a support pole 104 and a first spring 103. The other end of the support frame 102 is slidingly connected to the support pole 104. The top of the support pole 104 is fixedly connected to the support plate 101 at the next position. The bottom of the support pole 104 is covered with a first spring 103.

[0053] Specifically, the other end of the support frame 102 is slidably connected to the support upright 104, the top of the support upright 104 is fixedly connected to the support plate 101 of the next position, and the bottom of the support upright 104 is covered with a first spring 103, so that when the support plate 101 of the previous position descends, the support frame 102 and the support plate 101 move downward together. At this time, the support frame 102 compresses the first spring 103, and a gap is generated between the two support plates 101, and the coal above falls along the gap.

[0054] In some embodiments, the flip limiter 300 includes a flip limiter 301 rotatably connected to the inclined surface of the outward-expanding inclined plate 201 and a traction rope 302. A resistance plate is provided on the inner side of the flip limiter 301. The flip limiter 301 is rotatably connected to the outward-expanding inclined plate 201 via a rotating shaft. The traction rope 302 is wound around the rotating shaft, and the other end of the traction rope 302 is wound around the shaft at the rotatable connection between the outward-expanding inclined plate 201 and the outward-expanding inclined plate 201. In addition, after falling gravel falls through the gap, coal can easily slide directly from the side of the outward-expanding inclined plate 201 to the bottom, affecting the normal operation of the machine. In this way, during the rotation of the inclined rod 202, the tilt limiter 300 is driven by the inclined rod 202 to rotate, and the tilt limiter 300 gradually tends to be perpendicular to the outward-expanding inclined plate 201, thereby limiting the side of the outward-expanding inclined plate 201 and preventing coal from sliding from the side of the outward-expanding inclined plate 201.

[0055] As described above, the flip limiter 300 is used to limit the coal on the outward expansion inclined plate 201. Therefore, the specific structure of the flip limiter 300 is disclosed. The flip limiter 301 includes a flip limiter plate 301 that is rotatably connected to the inclined surface of the outward expansion inclined plate 201. The flip limiter plate 301 is rotatably connected to the outward expansion inclined plate 201 via a rotating shaft. A traction rope 302 is wound around the rotating shaft. The other end of the traction rope 302 is wound around the shaft at the rotatable connection between the outward expansion inclined plate 201 and the outward expansion inclined plate 201. When the traction rope 302 is stretched, the flip limiter plate 301 flips inward along the rotating shaft. When the flip limiter plate 301 rotates to be perpendicular to the outward expansion inclined plate 201, the flip limiter plate 301 prevents the coal from falling directly from the side of the outward expansion inclined plate 201, thereby ensuring the normal operation of the underlying machine.

[0056] At the same time, when the flip limit plate 301 rotates to be perpendicular to the outward expansion inclined plate 201, the friction plate on the inner side of the flip limit plate 301 contacts the side of the protective plate 110, thereby increasing the resistance between the protective plate 110 and the flip limit plate 301 when the coal hits the protective plate 110, thereby limiting the outward expansion of the protective plate 110.

[0057] It should be noted that the friction plate has a one-way friction characteristic. When the protective plate 110 expands outward, the resistance between the friction plate and the protective plate 110 is greater than the resistance in the other direction (that is, the protective plate 110 moves inward). In this way, a higher friction force on the protective plate 110 can be maintained in a specific direction.

[0058] In some embodiments, a protective device is further provided on the outside of the outward-expanding inclined plate 201 for limiting the impact of coal on the support plate 101. The protective device includes a protective plate 110. The protective plate 110 is fan-shaped and located in the discharge channel. The protective plate 110 is inclined upward at the coal discharge port.

[0059] Although the upward movement of the outward-expanding inclined plate 201 can reduce the heavy impact potential energy of the falling coal, when the coal slides along the inclined surface of the outward-expanding inclined plate 201, the gravitational potential energy of the coal is converted into kinetic energy and collides with the inner wall of the support plate 101 along the inclined surface of the outward-expanding inclined plate 201. At this time, the support plate 101 at the next level is still supporting the coal seam, which will increase the vibration amplitude between the support plate 101 at the next level and the coal seam, causing more coal to fall from the high gap and affect the normal operation of the machine below.

[0060] In view of the above problems, a protective device is provided on the outside of the outward-expanding inclined plate 201 to limit the impact of coal on the support plate 101. When the coal is about to hit the inner wall of the support plate 101, the protective device will first intercept the coal, thereby protecting the support plate 101, reducing the vibration of the support plate 101, and improving the service life of the support plate 101.

[0061] Based on the above structure, the specific structure of the protective device is disclosed below.

[0062] Specifically, the protective device includes a protective plate 110, which is fan-shaped and located in the discharge channel, and the protective plate 110 is tilted upward at the coal discharge port. The purpose of this is that when the coal slides down from the outward-expanding inclined plate 201, the end of the protective plate 110 is tilted upward, so that the coal can slide smoothly from the discharge port into the discharge channel, preventing the coal from being blocked by the end of the protective plate 110, thereby ensuring the normal discharge of the coal.

[0063] It should be noted here that: considering that the fallen coal will be scattered on the ground, causing inconvenience in cleaning, a dredging pipe can be set at the bottom of the vertical surface of the outward-expanding inclined plate 201 through which the coal passes. The fallen coal can be guided to the conveyor belt through the dredging pipe so that it can be transported together with the mined coal. This method of guiding coal is common knowledge and will not be described in detail here.

[0064] Furthermore, the protective device includes a damper 112 and a second spring 111. The damper 112 is fixedly connected to one end of the inner side of the protective plate 110, and the other end of the damper 112 is fixed to the inclined brace 202. The second spring 111 sleeved on the damper 112 abuts against the protective plate 110 and the inclined brace 202, respectively. To prevent direct rigid contact with the protective plate 110 after coal strikes the protective plate 110, which could easily cause damage to the protective plate 110 over a long period of time, the damper 112 is fixedly connected to one end of the inner side of the protective plate 110, and the other end of the damper 112 is fixed to the inclined brace 202. The second spring 111 sleeved on the damper 112 abuts against the protective plate 110 and the inclined brace 202, respectively. When the coal hits the protective plate 110, the elastic potential energy of the second spring 111 and the damper 112 can reduce the impact on the protective plate 110 and protect the protective plate 110. In addition, when the protective plate 110 moves outward to the maximum displacement, the protective plate 110 is still not in contact with the support plate 101. This can avoid the protective plate 110 from vibrating after contacting the support plate 101, causing more coal to fall, and increasing the burden on the outward inclined plate 201 and the protective plate 110.

[0065] In some embodiments, when the flip limit plate 301 flips inward and becomes perpendicular to the outward-expanding inclined plate 201, the friction plate inside the flip limit plate 301 contacts the side of the protective plate 110. Coal can easily slide directly down the side of the outward-expanding inclined plate 201, affecting the normal operation of the machine. Therefore, during the rotation of the inclined tie rod 202, the tilt limiter 300 is driven by the inclined tie rod 202, causing it to rotate and gradually become perpendicular to the outward-expanding inclined plate 201, thereby limiting the side of the outward-expanding inclined plate 201 and preventing coal from sliding down the side of the outward-expanding inclined plate 201.

[0066] In some embodiments, a flame retardant buffer plate is further included. A flame retardant buffer plate is provided on one end surface of the outwardly expanding inclined plate 201 adjacent to the support plate 101 .

[0067] The flame retardant buffer plate is provided on the upper end surface of the outwardly expanding inclined plate 201 , and the material of the flame retardant buffer plate can be flame retardant material, for example, the material of the flame retardant buffer plate is buffer rubber with flame retardant properties.

[0068] The following describes the component arrangement principle of the underground advance support device according to the embodiment of the present invention:

[0069] The underground advance support device includes a support mechanism body 100 and a support plate 101 on the top of the support mechanism body 100 for supporting the coal seam. When supporting the coal seam above, the support plates 101 on both sides fit together, and the support mechanism body 100 at the bottom provides support for the support plate 101, thereby facilitating the normal operation of the machine at the bottom of the support plate 101. On the other hand, a support assembly is provided on the inner side of the support plate 101. The support assembly is used to extend outward when the support plate 101 at the previous position descends (the support plate 101 at the next position is still in contact with the coal seam, and a gap is generated between the support plates 101 at the previous position and the next position, thereby causing the coal above to fall, hereinafter referred to as the gap). The expansion part 200 provided on the support assembly is extended outward to form a feeding channel between the expansion part 200 and the support plate 101, so that the coal falling between adjacent support plates 101 slides along the feeding channel to the bottom end of the inner side of the support plate 101, and in the process of the expansion part 200 extending outward, the expansion part 200 is used to drive the flip limit part 300 provided at the end to rotate inward, and the flip limit part 300 blocks the coal falling onto the expansion part 200, thereby limiting the coal from falling from the side of the expansion part 200.

[0070] It can be seen from this that when the support plate 101 in the previous position moves downward, the expansion part 200 extends outward, shortening the distance between the falling coal and the expansion part 200, thereby reducing the potential energy of the coal falling onto the expansion part 200, thereby protecting the expansion part 200, and in the process of the expansion part 200 extending outward, the expansion part 200 drives the flip limit part 300 to rotate the flip limit part 300 to be perpendicular to the expansion part 200, thereby restricting the coal falling from the gap and preventing the coal from sliding out from the side of the expansion part 200, thereby affecting the machine at the bottom.

[0071] Therefore, based on the above structure, before protecting the fallen coal, the specific structure of the support assembly is disclosed first.

[0072] The support assembly consists of a support frame 102, a first screw rod 105, and a second screw rod 106. The first screw rod 105, which is fixedly connected to one end of the support frame 102, is threadedly connected to the second screw rod 106 sleeved on the outside. The second screw rod 106 is threadedly connected to the auxiliary ring 120, and the top end of the second screw rod 106 is rotatably connected to the inner wall of the support plate 101. In addition, the other end of the support frame 102 is slidably connected to the support vertical rod 104. The top end of the support vertical rod 104 is fixedly connected to the support plate 101 at the next level. The bottom of the support vertical rod 104 is covered with a first spring 103. In this way, when the support plate 101 at the previous level descends, the support frame 102 and the support plate 101 move downward together. At this time, the support frame 102 compresses the first spring 103, and a gap is formed between the two support plates 101, and the coal above falls along the gap.

[0073] In order to reduce the potential energy of coal and reduce the impact of coal on the expansion part 200, the structure of the expansion part 200 is disclosed. The expansion part 200 includes an expansion inclined plate 201 and an inclined rod 202 rotatably connected to the expansion inclined plate 201. The inclined rod 202 is rotatably connected to the expansion inclined plate 201.

[0074] The inclined brace 202 is rotatably connected to the auxiliary collar 120. The outer expansion inclined plate 201 is inclined at the top and vertical at the bottom. Furthermore, an auxiliary collar 120 is provided at one end of the inclined brace 202, away from the rotational connection with the outer expansion inclined plate 201. This allows the second screw rod 106 to rotate under the action of the first screw rod 105, and the auxiliary collar 120 to move downward along the second screw rod 106. This pushes the outer expansion inclined plate 201 outward through the inclined brace 202, causing it to extend outward. This raises the outer expansion inclined plate 201 as a whole, reducing the angle at which fallen coal slides along the inclined surface of the outer expansion inclined plate 201, thereby reducing the potential energy of the fallen coal and protecting the support plate 101.

[0075] It should be noted that: in order to prevent the outward-expanding inclined plates 201 on both sides from rotating along the rotating connection with the support frame body 102 when the second screw rod 106 does not rotate under normal circumstances, which will cause the upward flipping angle of the protective plate 110 to decrease, therefore, the two ends of the auxiliary collar 120 are fixedly connected with limit blocks 121 for limiting the clockwise rotation of the diagonal rod 202. When the outward-expanding inclined plates 201 have not yet extended outward, the limit blocks 121 can be used to limit the rotation between the diagonal rod 202 and the auxiliary collar 120 under the action of gravity, thereby maintaining the initial state of the diagonal rod 202.

[0076] Furthermore, as mentioned above, although the upward movement of the outward-expanding inclined plate 201 can reduce the heavy impact potential energy of the falling coal, when the coal slides along the inclined surface of the outward-expanding inclined plate 201, the gravitational potential energy of the coal is converted into kinetic energy and collides with the inner wall of the support plate 101 along the inclined surface of the outward-expanding inclined plate 201. At this time, the support plate 101 at the next level is still supporting the coal seam, which will increase the vibration amplitude between the support plate 101 at the next level and the coal seam, causing more coal to fall from the high gap and affect the normal operation of the machine below.

[0077] In view of the above problems, a protective device is provided on the outside of the outward-expanding inclined plate 201 to limit the impact of coal on the support plate 101. When the coal is about to hit the inner wall of the support plate 101, the protective device will first intercept the coal, thereby protecting the support plate 101, reducing the vibration of the support plate 101, and improving the service life of the support plate 101.

[0078] Based on the above structure, the specific structure of the protective device is disclosed below. The protective device includes a protective plate 110. The protective plate 110 is fan-shaped and located in the discharge channel. The protective plate 110 is tilted upward at the coal discharge port. The purpose of this is that when the coal slides off the outward-expanding inclined plate 201, the end of the protective plate 110 is tilted upward, so that the coal can slide smoothly from the discharge port into the discharge channel, preventing the coal from being blocked by the end of the protective plate 110, thereby ensuring the normal discharge of coal.

[0079] It should be noted here that: considering that the fallen coal will be scattered on the ground, causing inconvenience in cleaning, a dredging pipe can be set at the bottom of the vertical surface of the outward-expanding inclined plate 201 through which the coal passes. The fallen coal can be guided to the conveyor belt through the dredging pipe so that it can be transported together with the mined coal. This method of guiding coal is common knowledge and will not be described in detail here.

[0080] To prevent direct, rigid contact with the protective plate 110 after coal strikes it, which could easily damage it over time, a damper 112 is fixedly attached to one end of the inner side of the protective plate 110. The other end of the damper 112 is fixed to the inclined brace 202. A second spring 111 sleeved on the damper 112 acts against the protective plate 110 and the inclined brace 202, respectively. When coal strikes the protective plate 110, the elastic potential energy of the second spring 111 and the damper 112 mitigate the impact on the protective plate 110, protecting it. Furthermore, when the protective plate 110 reaches its maximum outward displacement, it still does not contact the support plate 101. This prevents the support plate 101 from vibrating after contact, which could cause more coal to fall and increase the burden on the outward-expanding inclined plate 201 and the protective plate 110.

[0081] In addition, after the fallen gravel falls from the gap, the coal can easily slide directly from the side of the outward-expanding inclined plate 201 to the bottom, affecting the normal operation of the machine. In this way, during the rotation of the inclined rod 202, the inclined rod 202 drives the flip limit part 300 to rotate, and the flip limit part 300 gradually tends to be perpendicular to the outward-expanding inclined plate 201, so as to limit the side of the outward-expanding inclined plate 201 and prevent the coal from sliding from the side of the outward-expanding inclined plate 201.

[0082] As described above, the flip limiter 300 is used to limit the coal on the outward expansion inclined plate 201. Therefore, the specific structure of the flip limiter 300 is disclosed. The flip limiter 301 includes a flip limiter plate 301 that is rotatably connected to the inclined surface of the outward expansion inclined plate 201. The flip limiter plate 301 is rotatably connected to the outward expansion inclined plate 201 via a rotating shaft. A traction rope 302 is wound around the rotating shaft. The other end of the traction rope 302 is wound around the shaft at the rotatable connection between the outward expansion inclined plate 201 and the outward expansion inclined plate 201. When the traction rope 302 is stretched, the flip limiter plate 301 flips inward along the rotating shaft. When the flip limiter plate 301 rotates to be perpendicular to the outward expansion inclined plate 201, the flip limiter plate 301 prevents the coal from falling directly from the side of the outward expansion inclined plate 201, thereby ensuring the normal operation of the underlying machine.

[0083] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0085] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0086] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0087] In the present invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0088] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An underground advanced support device, characterized in that: include: The support mechanism body and the support plate on the top of the support mechanism body are used to support the coal seam, and the support plates of the previous position and the next position are attached to each other in the extension direction of the support mechanism body; A support assembly, an outward expansion portion, and a flip limit portion, wherein a support assembly is provided on the inner side of the support plate, the support assembly is pivotally connected to the outward expansion portion, and the support assembly is provided with outward expansion portions on both sides of the width direction of the support body, and the outward expansion portion is provided with a flip limit portion at at least one end in the extension direction of the support body, and the flip limit portion is rotatable relative to the outward expansion portion; the outward expansion portion includes an outward expansion inclined plate and a diagonal pull rod rotatably connected to the outward expansion inclined plate, the outward expansion inclined plate is inclined at the top and vertical at the bottom; The auxiliary collar is threadedly connected to the support assembly and moves in the height direction of the support mechanism body. Both ends of the auxiliary collar in the width direction of the support body are pivotally connected to a diagonal rod respectively. The auxiliary collar is fixedly connected to a limit block for limiting the clockwise rotation of the diagonal rod to limit the rotation angle of the diagonal rod. The support assembly includes a support frame body, a first screw rod and a second screw rod, wherein one end of the support frame body is fixedly connected to the first screw rod, the first screw rod is threadedly connected to the second screw rod sleeved on the outside, the second screw rod is threadedly connected to the auxiliary collar, and the top end of the second screw rod is rotatably connected to the inner wall of the support plate; the support assembly also includes a support rod and a first spring, the other end of the support frame body is slidably connected to the support rod, the top end of the support rod is fixedly connected to the support plate at the next position, and the bottom of the support rod is sleeved with the first spring; The outside of the outward-expanding inclined plate is also provided with a protective device for limiting the impact of coal on the support plate. The protective device includes a protective plate. The protective plate is fan-shaped and located in the discharge channel. The protective plate is inclined upward at the coal discharge port.

2. The underground advanced support device according to claim 1, characterized in that: The flip limiting part includes a flip limiting plate rotatably connected to the inclined surface of the outward-expanding inclined plate and a traction rope. A resistance plate is provided on the inner side of the flip limiting plate. The flip limiting plate is rotatably connected to the outward-expanding inclined plate through a rotating shaft. A traction rope is wound around the rotating shaft. The other end of the traction rope is wound around the shaft rod at the rotational connection between the outward-expanding inclined plate and the outward-expanding inclined plate.

3. The underground advanced support device according to claim 1, characterized in that: The protective device includes a damper and a second spring. One end of the inner side of the protective plate is fixedly connected to the damper, and the other end of the damper is fixed on the inclined rod. The second spring sleeved on the damper is respectively against the protective plate and the inclined rod.

4. The underground advanced support device according to claim 1, characterized in that: When the turnover limit plate is turned inwardly and is perpendicular to the outwardly expanding inclined plate, the friction plate on the inner side of the turnover limit plate contacts the side edge of the protective plate.

5. The underground advanced support device according to claim 4, characterized in that: It also includes a flame retardant buffer plate, and a flame retardant buffer plate is provided on one end surface of the outward-expanding inclined plate adjacent to the support plate.

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