Hydraulic support for coal seam with inclination angle of 50-90 degrees

Abstract

The invention relates to the technical field of steeply inclined coal face supporting, in particular to a hydraulic support for a coal seam with an inclination angle of 50-90 degrees, and the hydraulic support is used for mining and supporting of the steeply inclined coal seam. The device is reasonable and compact in structure and convenient to use, when a cylinder body of the supporting stand column is located on the beveled base side, a hinge base hinged to the middle of the cylinder body of the supporting stand column is arranged on the upper portion of the beveled base, and when the cylinder body of the supporting stand column is located on the beveled top beam side, a hinge base hinged to the middle of the cylinder body of the supporting stand column is arranged on the lower portion of the beveled top beam; according to the supporting stand column structure, the supporting stand column can be prevented from being damaged due to torsion under the action of gravity when the supporting stand column is in a nearly horizontal supporting state, the supporting stand column can better adapt to side horizontal type supporting operation, the support can directly move in the coal mining direction by means of the support, the support moving speed is high, and efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of steeply inclined coal mining working face support, in particular to a hydraulic support used for coal seams with an inclination angle of 50°-90°. Background Art

[0002] The traditional hydraulic supports for near-horizontal working surfaces and gently inclined working surfaces have a small inclination angle, and the support is carried out when the column support is perpendicular to the ground or the angle of inclination with the ground is not large. The movement of the hydraulic support relies on the push jack in the support bevel base to pull the scraper conveyor at the front end of the bevel base to drag the support forward, that is, the support moves forward relying on the traction of the scraper conveyor, and the coal seam is mined by a coal mining machine riding on the scraper. The currently used large-angle hydraulic supports still use the above-mentioned support, frame transfer and three-machine matching solutions for horizontal working surfaces, but add a series of anti-falling and anti-slip jacks to prevent the support from tipping over.

[0003] In the working face with coal seam inclination greater than 70 degrees, this hydraulic support support and frame moving scheme is difficult to apply. The traditional three-machine matching longwall mining method in high-angle coal seams has been studying, solving, and overcoming a series of problems such as support anti-falling, anti-skidding, and anti-skidding and dumping of coal mining machines and scraper conveyors when the working face angle is large. In high-angle coal seams, especially coal seams with angles gradually approaching 90 degrees, the traditional three-machine matching longwall mining method has not had a good solution. There is no effective solution for mining steeply inclined coal seams using traditional methods and processes. Some mines have tried to pseudo-incline the working face at a certain angle to reduce the sliding force of the three machines, so that this three-machine arrangement can be better applied in steeply inclined coal seams of about 60 degrees. However, after the pseudo-incline of the working face, the scraper conveyor and coal mining machine increase the overturning force on the coal wall of the working face, making it impossible for coal mining machines and scraper conveyors to be well applied in pseudo-incline working faces. Therefore, there is currently no three-machine layout plan that can be well applied in steeply inclined coal seams. Since the mining of steeply inclined coal seams faces high adaptability requirements and great difficulty in coal mine machinery and equipment, the mining of steeply inclined coal seams in most mining areas has developed slowly, with low recovery rates and serious waste of resources.

[0004] In the mining of steeply inclined coal seams, flexible shield support mining method and small-stage coal seam hydraulic support mining technology have been used for steeply inclined coal seams with a thickness of less than 8 meters and a coal seam inclination angle greater than 45 degrees. However, both methods have defects and are no longer suitable for use in this type of coal seam. This type of coal seam has not had any reliable and practical supporting equipment and mining equipment available for use. Currently, mining has to be abandoned when encountering this type of coal seam.

[0005] The arrangement of the flexible shield support mining method is to set a return air chute parallel to the horizontal plane in the upper part of the steeply inclined coal seam, and set a transport chute parallel to the horizontal plane at a certain distance from the return air chute. The pseudo-bevel cut eye runs through the upper and lower tunnels, and the angle between the pseudo-bevel cut eye and the horizontal plane is about 20 to 40 degrees. During the downward advancement of the flexible shield support, the lower shield support gradually enters the transport chute, and the support that enters the transport chute needs to be continuously transported to the upper return air chute for support replenishment, which is labor-intensive; in addition, this type of support is suitable for a small range of coal seam thickness. When the coal seam becomes thicker, coal will be lost, and it cannot be used when the coal seam becomes thinner. Different lengths of flexible shield supports need to be configured for different coal seam changes. There are many problems such as inconvenience in use, low mechanical mining efficiency, high labor intensity, low output, unstable support and poor safety. At present, this coal mining process and matching support equipment are rarely used in coal mines due to high labor intensity and low output.

[0006] The small-stage coal seam hydraulic support mining process is adopted. The tunnel layout of the support is to set a return air chute parallel to the horizontal plane in the middle and upper part of the steeply inclined coal seam, and set a transport chute parallel to the horizontal plane at the lower part about 20 meters away from the return air chute. A ventilation hole with a diameter of about 800mm is drilled every 6 meters between the upper and lower tunnels to make the upper and lower tunnels connected to form a U-shaped ventilation. The support is arranged in the lower transport chute, and the direction of the support is to move forward along the transport chute. In this arrangement, the ventilation holes at the rear and upper parts of the support cannot achieve U-shaped ventilation due to collapse damage or obstruction by the inclined top beam of the support. The ventilation holes at the front of the support can achieve U-shaped ventilation, but fresh air is difficult to reach the working position of the support. The working position of the support is a blind alley, which is easy to cause gas accumulation and bring great safety hazards. In 2016, the horizontal segmented top coal mining method of the steeply inclined 4 to 8 meter single thick coal seam could not build a safe U-shaped ventilation system and there was a risk of toxic and harmful gas accumulation on the working face, so it was eliminated by the coal safety inspection department. At present, this equipment and mining process have been completely discontinued.

[0007] The Chinese patent document with the announcement number CN214303888U discloses a steeply inclined coal seam pseudo-inclined special hydraulic support, which still has defects during use. For example, the bevel telescopic guide rods of adjacent hydraulic supports are connected together by dumbbell pins, and multiple hydraulic supports are pulled forward in sequence by the bevel telescopic guide rods connected as one. In this scheme, dumbbell pins are connected between the telescopic guide rods of the bevel base to realize the forward movement of the bevel base of the support. However, when dumbbell pins are connected between the telescopic guide rods of the bevel top beam of the support, the support cannot be retracted to release pressure and move the support because the bevel top beams of the support are all connected together. A single bracket cannot shrink and release pressure, so there is a big problem of mutual restraint between the forward movement of the beveled top beam of the bracket and the pressure relief and shrinkage of the beveled top beam of the bracket. The dumbbell pin structure of the beveled top beam cannot make the beveled top beam move forward, so the forward movement of the bracket is inconvenient. If the bracket is a side-lying type, and the bracket column is nearly horizontally supported, the top end of the column rod body is still hinged to the beveled top beam, and the bottom end of the column cylinder body is supported on the beveled base through the column socket. When the bracket is horizontally supported, due to the heavy weight of the column, the seal between the column rod body and the cylinder body generates a large torsional force under the action of gravity, which can easily cause damage to the seal of the column. Summary of the invention

[0008] The present invention provides a hydraulic support for coal seams with an inclination angle of 50°-90°, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of inconvenience in moving the existing side-lying support for steeply inclined coal seams and the problem that the nearly horizontal support columns are easily damaged by gravity when the support is side-lying.

[0009] The technical solution of the present invention is achieved through the following measures: a hydraulic support for coal seams with an inclination angle of 50°-90°, used for mining support of steeply inclined coal seams, a plurality of supports are arranged parallel to the transport chute and inclined upward and overlapped with each other, and mining support is performed in a direction parallel to the transport chute, characterized in that it includes a beveled top beam, a shielding device and a beveled base connected in sequence, a plurality of support columns are arranged between the beveled top beam and the beveled base, the plurality of support columns are all nearly horizontal supports, the middle part of the support column cylinder body is hinged to the beveled top beam or the beveled base, the end of the support column piston rod is hinged to the beveled base or the beveled top beam, and each support is provided with a frame moving device, which can move the support forward a working distance after the frame moving device is actuated.

[0010] The following are further optimizations and / or improvements to the above technical solutions: As a first preferred embodiment, the above-mentioned frame moving device may include a first frame pulling cylinder and a second frame pulling cylinder, and one side end of the first frame pulling cylinder of two beveled top beams at adjacent positions and one side end of the second frame pulling cylinder of two beveled bases at adjacent positions are connected to the adjacent frame through a chain or a cross connecting rod or a rotating joint or a wire rope or are directly connected to the adjacent frame.

[0011] As a second preferred embodiment, the above-mentioned frame moving device may include a third frame pulling cylinder and a fourth frame pulling cylinder, and one side end of the third frame pulling cylinder of two adjacent beveled top beams and one side end of the fourth frame pulling cylinder of two adjacent beveled bases are connected to the adjacent frame through a fixed pulley mechanism and a steel wire rope.

[0012] The above-mentioned shielding device may include a shielding plug plate and a horizontal plug plate. The rear of the beveled top beam is hinged with a shielding plug plate, the upper side of the rear of the beveled top beam is hinged with a horizontal plug plate, and the rear of the beveled base is provided with a shielding cavity for inserting the shielding plug plate and the horizontal plug plate.

[0013] The front part of the beveled base may be provided with a guide rod cavity, and a telescopic guide rod is hingedly connected to the middle part of the front end of the beveled top beam, and the other end of the telescopic guide rod is inserted into the guide rod cavity.

[0014] The side of the bevel top beam may be provided with a frame adjustment guard plate, a plurality of first side thrust cylinders are provided between the frame adjustment guard plate and the bevel top beam, a frame adjustment beam is provided on the side of the bevel base, a plurality of second side thrust cylinders are provided between the frame adjustment beam and the bevel base.

[0015] The front end of the beveled top beam and the front end of the beveled base can be beveled to match the slope of the working surface, the rear end shielding cavity of the beveled base is inclined parallel to the front end of the beveled top beam and the front end of the beveled base, and the shielding plug hinged on the beveled top beam is hinged with the shielding cavity of the beveled base at a corresponding inclination.

[0016] The present invention has a reasonable and compact structure and is easy to use. When the cylinder body of the support column is located on the side of the bevel base, the upper part of the bevel base is provided with a hinged seat hinged to the middle part of the cylinder body of the support column; when the cylinder body of the support column is located on the side of the bevel top beam, the lower part of the bevel top beam is provided with a hinged seat hinged to the middle part of the cylinder body of the support column. The support column structure can avoid damage to the support column due to torsion under the action of gravity when the support column is in a nearly horizontal support state, so that the support column can better adapt to side-lying support operations. The bracket of the present application can rely on the bracket itself to move directly along the coal mining direction, and the frame moving speed is fast and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a side view schematic diagram of the structure of the best embodiment of the present invention.

[0018] Attached Figure 2 For attachment Figure 1 A top view of a hydraulic support for coal seams with an inclination angle of 50°-90°.

[0019] Attached Figure 3 For attachment Figure 2 AA section view of the .

[0020] Attached Figure 4 For attachment Figure 2 BB cross-sectional view.

[0021] Attached Figure 5 For attachment Figure 2 Front view of the center-beveled top beam.

[0022] Attached Figure 6 For attachment Figure 2 C-direction view.

[0023] Attached Figure 7 It is a side view structural schematic diagram of the connection of two adjacent beveled top beams in the first preferred embodiment of the present invention.

[0024] Attached Figure 8 It is a side view structural schematic diagram of the connection of two adjacent beveled bases in the first preferred embodiment of the present invention.

[0025] Attached Fig. 9 It is a side structural schematic diagram of the connection of two adjacent beveled top beams in the second preferred embodiment of the present invention.

[0026] Attached Fig.10 It is a side view structural schematic diagram of the connection of two adjacent beveled bases in the second preferred embodiment of the present invention.

[0027] Attached Fig.11 This is a schematic diagram of the vertical support or near vertical support of the existing column.

[0028] Attached Fig.12 This is a schematic diagram of the horizontal or nearly horizontal support of the existing columns.

[0029] Attached Fig.13 It is a schematic diagram of the supporting column in the present invention when it is horizontally supported or nearly horizontally supported.

[0030] The codes in the accompanying drawings are: 1 is a supporting column, 2 is a beveled top beam, 3 is a beveled base, 4 is a first pulling cylinder, 5 is a second pulling cylinder, 6 is a third pulling cylinder, 7 is a fourth pulling cylinder, 8 is a wire rope, 9 is a fixed pulley mechanism, 10 is a shielding plate, 11 is a horizontal plate, 12 is a shielding cavity, 13 is a telescopic guide rod, 14 is a guide rod cavity, 15 is a frame adjustment guard plate, 16 is a first side thrust cylinder, 17 is a frame adjustment beam, 18 is a second side thrust cylinder, 19 is a coal seam, 20 is a transport chute, 21 is a return air chute, and 22 is a working face. DETAILED DESCRIPTION

[0031] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0032] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout of the coal mining direction is described in detail, such as the position relationship of front, back, top, bottom, left, right, etc., which is based on the instructions attached to the manual. Figure 1 The layout direction of the coal mining direction is determined by the Figure 1 The coal mining direction indicated by the middle arrow is forward.

[0033] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figures 1 to 10 As shown, the hydraulic support for coal seams with an inclination angle of 50°-90° is used for mining support of steeply inclined coal seams. Several supports are arranged parallel to the transport chute 20 and overlap each other, and are mined and supported in a direction parallel to the transport chute 20. It is characterized in that it includes a beveled top beam 2, a shielding device and a beveled base 3 connected in sequence, and several support columns 1 are arranged between the beveled top beam 2 and the beveled base 3. The several support columns 1 are all nearly horizontal supports. The middle part of the cylinder body of the support column 1 is hinged to the beveled top beam 2 or the beveled base 3, and the end of the corresponding support column 1 piston rod is hinged to the beveled base 3 or the beveled top beam 2. Each support is provided with a frame moving device, which can move the support forward a working distance after the frame moving device is actuated.

[0034] The plurality of support columns 1 are all nearly horizontal supports, and the angle between each support column 1 and the horizontal plane is between 0° and 30°.

[0035] At least one row of supporting column groups is hinged between the beveled top beam 2 and the beveled base 3, and each row of supporting column groups includes two supporting columns 1 arranged in parallel. When the pressure of the beveled top beam 2 of the bracket is large, it can be set to two rows of supporting column groups (two supporting columns 1 are set in each row of supporting column groups) to increase the working resistance of the beveled top beam 2 of the bracket and improve the supporting force of the front end of the bracket. The supporting column 1 is improved on the basis of the existing known support columns.

[0036] The present invention has a reasonable and compact structure and is easy to use. When the cylinder body of the support column 1 is located on the side of the bevel base, the upper part of the bevel base 3 is provided with a hinged seat hinged to the middle part of the cylinder body of the support column 1; when the cylinder body of the support column 1 is located on the side of the bevel top beam 2, the lower part of the bevel top beam 2 is provided with a hinged seat hinged to the middle part of the cylinder body of the support column 1. The support column structure can avoid damage to the seal of the support column 1 due to torsion under the action of gravity when the support column 1 is in a nearly horizontal support state, so that the support column 1 can better adapt to side-lying support operations. The bracket of the present application can rely on the bracket itself to move directly along the coal mining direction, and the frame moving speed is fast and the efficiency is high.

[0037] A transport chute 20 is horizontally arranged below the inclined coal seam 19, a return air chute 21 is horizontally arranged at a certain distance above the transport chute 20, a working face 22 is obliquely arranged between the recovery chute and the transport chute 20, the included angle between the working face 22 and the transport chute 20 is between 30 and 45 degrees, and brackets a, b, c and d are horizontally stacked in sequence on the working face 22 obliquely upward.

[0038] like Figure 1 As shown, bracket a has moved forward horizontally a working distance. After the moving rack device connected between bracket a and bracket b is actuated (contracted), bracket b can be pulled forward horizontally a working distance. Similarly, contracting the moving rack device connected between bracket b and bracket c can pull bracket c forward horizontally a working distance. In this way, horizontal movement of bracket d and other brackets on the working surface 22 can be achieved.

[0039] Support column 1 has Fig.11 , 12 , 13 three ways, Fig.11 This is the method of vertical support of the traditional bracket column. The supporting points are the upper spherical surface of the column rod body and the lower spherical surface of the column cylinder body. The column is subjected to vertical downward pressure, and the column has no lateral rotational torque. Therefore, the column seal is not subject to lateral rotational torque. The column seal is in good stress state and is not easily damaged. However, the support column 1 between the beveled top beam 2 and the beveled base 3 of this bracket is not suitable for being set in the vertical direction.

[0040] When the support column 1 is placed horizontally, as shown in the attached Fig.12 As shown, the supporting points of the support column 1 are the end spherical surfaces of the rod body of the support column 1 and the end spherical surfaces of the cylinder body of the support column 1. In addition to being subjected to horizontal pressure, the cylinder body of the support column 1 is subjected to a clockwise moment around the supporting point under the action of gravity, and the rod body of the support column 1 is subjected to a counterclockwise moment around the supporting point. Under the interaction of the moments of the rod body of the support column 1 and the cylinder body of the support column 1, the seals on the mating surfaces of the cylinder body of the support column 1 and the rod body are subjected to a large superimposed steering moment of the cylinder body and the rod body. This moment will cause the seal of the support column 1 to be quickly damaged, resulting in leakage and pressure relief of the support column 1. Therefore, the support column 1 with this structure is not suitable for occasions where the bracket is laterally supported or the support column 1 is horizontally supported.

[0041] Press Attach Fig.13 Move the support point at the bottom of the cylinder of support column 1 forward to the middle position of the cylinder of support column 1 (the specific position is based on the balance of the weight of the cylinder and the rod body compared to the support point). At this time, the force on support column 1 is as shown in the figure. Fig.13 As shown, the horizontal pressure on the supporting column 1 is Fig.12Similarly, the cylinder of the support column 1 has a counterclockwise moment around the support point under the action of gravity, and the rod body of the support column 1 has a counterclockwise moment around the support point under the action of gravity. The two kinds of torques acting on the support column 1 cancel each other out, resulting in the comprehensive torque acting on the seal of the mating surface of the cylinder of the support column 1 and the rod body being zero or very small, thereby greatly reducing the damage to the seal caused by gravity and allowing the support column 1 to work in a horizontal state without being damaged.

[0042] According to actual needs, the above hydraulic support for coal seams with an inclination angle of 50°-90° can be further optimized and / or improved: Embodiment 2: As an optimization of embodiment 1, as shown in the attached Figures 1 to 8 As shown, the frame moving device includes a first frame pulling cylinder 4 and a second frame pulling cylinder 5. One side end of the first frame pulling cylinder 4 of two adjacent beveled top beams 2 and one side end of the second frame pulling cylinder 5 of two adjacent beveled bases 3 are connected to the adjacent frames through chains or cross connecting rods or rotating joints or steel wire ropes or are directly connected to the adjacent frames.

[0043] In this way, the first frame pulling cylinder 4 and the second frame pulling cylinder 5 can realize rapid movement of the support after contraction, getting rid of the conventional support three-machine matching that relies on external coal mining machine, scraper and external traction mechanism to move the support, so that the support can be freed from the constraints of coal mining and transportation mechanisms, and the support can be matched with various coal mining equipment and transportation equipment, thereby making the support matching more flexible and diverse.

[0044] According to needs, two beveled top beams 2 at adjacent positions are connected together or directly connected to the adjacent frame through the first pulling frame cylinder 4 and the existing well-known chain or cross connecting rod or rotating joint or wire rope. The piston rod end of the first pulling frame cylinder 4 is connected to one end of the chain or cross connecting rod or rotating joint or connecting piece, and the other end of the chain or cross connecting rod or rotating joint or connecting piece is connected to another corresponding adjacent beveled top beam 2. The two beveled top beams 2 at adjacent positions can also be connected together through the first pulling frame cylinder 4 and the existing well-known wire rope, and the two beveled top beams 2 at adjacent positions can also be directly connected together through the first pulling frame cylinder 4.

[0045] The two bevel bases 3 at adjacent positions are connected together through the second pull-frame oil cylinder 5 and the existing well-known chain or cross connecting rod or rotating joint or connecting piece. The piston rod end of the second pull-frame oil cylinder 5 is connected to one end of the chain or cross connecting rod or rotating joint or connecting piece, and the other end of the chain or cross connecting rod or rotating joint or connecting piece is connected to the corresponding bevel base 3. The two bevel bases 3 at adjacent positions can also be connected together through the second pull-frame oil cylinder 5 and the existing well-known steel wire rope. The two bevel bases 3 at adjacent positions can also be directly connected together through the second pull-frame oil cylinder 5.

[0046] Embodiment 3: As another optimization of Embodiment 2, the difference between this embodiment and Embodiment 2 is only that the rack moving device is different. Figures 1 to 6 As shown in Figures 9 and 10, the frame moving device includes a third frame pulling cylinder 6 and a fourth frame pulling cylinder 7. One side end of the third frame pulling cylinder 6 of two adjacent beveled top beams 2 and one side end of the fourth frame pulling cylinder 7 of two adjacent beveled bases 3 are connected to the adjacent frames through a fixed pulley mechanism 9 and a steel wire rope 8.

[0047] In this way, the problem of moving the side-lying supports when supporting the steeply inclined coal seam can be solved. When the supports are operating on the working face 22 with a larger angle in the steeply inclined coal seam, the supports are arranged to be inclined upward and overlapped with each other parallel to the transport chute 20, that is, each support is a side-lying support, and the lower side surfaces of the support beveled top beam 2 and the beveled base 3 are sliding moving surfaces. This arrangement can adapt to various supporting forms such as downward mining coal mining machines in combination with scraper conveyors, or to milling mining using small milling equipment, or to mining using a milling arm that is mounted on the front end of the beveled base 3 and swings between the beveled top beam 2 and the beveled base 3. The support must rely on its own movement to achieve mining support, and is not connected to the mining equipment and transportation equipment in front of the support. It does not rely on these equipment to move the support, and does not need to be closely matched with these equipment.

[0048] One end of the third frame pulling cylinder 6 of two adjacent beveled top beams 2 and one end of the fourth frame pulling cylinder 7 of two adjacent beveled bases 3 are connected to the adjacent frames through the steel wire rope 8 of the fixed pulley mechanism 9.

[0049] The beveled top beams 2 in the present application are not mutually entangled, and the beveled top beams 2 of the bracket can smoothly shrink and release pressure. The beveled top beams 2 and the beveled base 3 both adopt the existing well-known jack moving frame, which can make the bracket smoothly move forward by relying on the adjacent brackets.

[0050] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2As shown, the shielding device includes a shielding plug plate 10 and a horizontal plug plate 11. The shielding plug plate 10 is hinged at the rear of the beveled top beam 2, and the horizontal plug plate 11 is hinged on the upper side of the rear of the beveled top beam 2. A shielding cavity 12 for inserting the shielding plug plate 10 and the horizontal plug plate 11 is provided at the rear of the beveled base 3.

[0051] A shielding cavity 12 is provided at the rear of the bevel base 3, so that the rear shielding plug plate 10 and the horizontal plug plate 11 can slide in the shielding cavity 12 with the extension and contraction of the support column 1, which can shield and block the coal and gangue that fall from the rear, and can also realize the extension and contraction action between the bevel top beam 2 and the bevel base 3, so that the goaf can be completely shielded and shielded, and the coal and gangue that fall from the rear can be well shielded and blocked from entering the working face 22. According to the needs, the shielding plug plate 10 and the horizontal plug plate 11 can also be hinged to the rear of the bevel base 3, and the shielding cavity 12 for inserting the shielding plug plate 10 and the horizontal plug plate 11 is provided at the rear of the bevel top beam 2. The shielding cavity 12 includes an angled cavity and a horizontal cavity provided at the rear of the bevel base 3 or the bevel top beam 2, and the shielding plug plate 10 and the horizontal plug plate 11 are respectively inserted into the angled cavity and the horizontal cavity.

[0052] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figures 2 to 4 As shown in 6 to 10 , a guide rod cavity 14 is provided at the front portion of the beveled base 3 , and a telescopic guide rod 13 is hingedly connected to the middle portion of the front end of the beveled top beam 2 , and the other end of the telescopic guide rod 13 is inserted into the guide rod cavity 14 .

[0053] The guide rod cavity 14 matches the telescopic guide rod 13, so that the other end of the telescopic guide rod 13 is inserted into the guide rod cavity 14, and the inner wall of the guide rod cavity 14 constrains the telescopic guide rod 13, thereby ensuring the support stability of the bracket and resisting the shear force generated in the oblique direction and during walking. According to needs, the telescopic guide rod 13 can also be hinged to the middle part of the front end of the beveled base 3, and the guide rod cavity 14 is arranged at the front part of the beveled top beam 2, and the other end of the telescopic guide rod 13 is inserted into the guide rod cavity 14.

[0054] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 3 , 5 As shown in , 6, 8, and 10, a frame adjustment guard plate 15 is provided on the side of the beveled top beam 2, a plurality of first side thrust cylinders 16 are provided between the frame adjustment guard plate 15 and the beveled top beam 2, a frame adjustment beam 17 is provided on the side of the beveled base 3, and a plurality of second side thrust cylinders 18 are provided between the frame adjustment beam 17 and the beveled base 3.

[0055] In this way, the first side thrust cylinder 16 and the second side thrust cylinder 18 are connected to the beveled top beam 2 and the beveled base 3 to adjust the bracket to prevent the bracket from tilting.

[0056] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1 , 7As shown in 10, the front end of the beveled top beam 2 and the front end of the beveled base 3 are both beveled to match the slope of the working surface, the rear end shielding cavity of the beveled base 3 is inclined parallel to the front end of the beveled top beam 2 and the front end of the beveled base 3, and the shielding plug plate 10 hinged to the beveled top beam 2 is hinged to the shielding cavity of the beveled base 3 at a corresponding inclination.

[0057] The angle between the working face 22 and the transport chute 20 is between 30 and 45 degrees. In this way, the brackets are arranged horizontally and stacked along the pseudo-bevel cut at an angle of 30 to 45 degrees, and the brackets are arranged on the working face 22 parallel to the transport chute 20 and upward along the pseudo-bevel cut. Because the working face 22 has a small inclination angle, the phenomenon of coal and gangue mined from the upper part rolling down and flying is reduced, and the overturning force on the bracket is offset by the pseudo-bevel cut coal wall, so that the bracket can always be in a stable working state at the working face 22.

[0058] The working face 22 can be mined by a downward mining coal mining machine in combination with a scraper conveyor. The working face 22 can also be mined by small milling equipment. The working face 22 can also be equipped with a milling arm hung at the front end of the bevel base 3 and swinging between the bevel top beam 2 and the bevel base 3. The front end of the milling arm is equipped with a milling head. The milling arm relies on the oil cylinder on the bevel base 3 to achieve a swinging mining form. The working face 22 can also be mined by other mining equipment that is not connected to the support. The support only plays a supporting role for the working face 22. The movement of the support is realized after the frame moving device is actuated. The support does not rely on other equipment such as coal mining machines, scrapers, external traction mechanisms and other facilities to move.

[0059] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A hydraulic support for coal seams with an inclination angle of 50°-90°, used for mining support of steeply inclined coal seams, wherein a plurality of supports are arranged parallel to the transport chute and overlapped with each other, and mining support is performed in a direction parallel to the transport chute, characterized in that It includes a beveled top beam, a shielding device and a beveled base which are connected in sequence. A plurality of supporting columns are arranged between the beveled top beam and the beveled base. The plurality of supporting columns are all nearly horizontal supports. The middle part of the supporting column cylinder body is hinged to the beveled top beam or the beveled base. The end of the supporting column piston rod is hinged to the beveled base or the beveled top beam. Each bracket is provided with a bracket moving device, which can move the bracket forward a working distance after the bracket moving device is actuated.

2. The hydraulic support for coal seams with an inclination angle of 50°-90° according to claim 1, characterized in that The frame moving device includes a first frame pulling cylinder and a second frame pulling cylinder. One side end of the first frame pulling cylinder of two adjacent beveled top beams and one side end of the second frame pulling cylinder of two adjacent beveled bases are connected to the adjacent frame through a chain or a cross connecting rod or a rotating joint or a steel wire rope or directly connected to the adjacent frame.

3. The hydraulic support for coal seams with an inclination angle of 50°-90° according to claim 1, characterized in that The frame moving device includes a third frame pulling cylinder and a fourth frame pulling cylinder. One side end of the third frame pulling cylinder of two adjacent beveled top beams and one side end of the fourth frame pulling cylinder of two adjacent beveled bases are connected to the adjacent frame through a fixed pulley mechanism and a steel wire rope.

4. The hydraulic support for coal seams with an inclination angle of 50°-90° according to claim 1, 2 or 3, characterized in that The shielding device comprises a shielding plug plate and a horizontal plug plate. The shielding plug plate is hinged at the rear of the beveled top beam, the horizontal plug plate is hinged at the upper side of the rear of the beveled top beam, and a shielding cavity for inserting the shielding plug plate and the horizontal plug plate is provided at the rear of the beveled base.

5. The hydraulic support for coal seams with an inclination angle of 50°-90° according to claim 4, characterized in that A guide rod cavity is arranged at the front of the beveled base, a telescopic guide rod is hinged at the middle of the front end of the beveled top beam, and the other end of the telescopic guide rod is inserted into the guide rod cavity.

6. The hydraulic support for coal seams with an inclination angle of 50°-90° according to claim 1, 2, 3 or 5, characterized in that A frame adjustment guard plate is arranged on the side of the bevel top beam, a plurality of first side thrust cylinders are arranged between the frame adjustment guard plate and the bevel top beam, a frame adjustment beam is arranged on the side of the bevel base, a plurality of second side thrust cylinders are arranged between the frame adjustment beam and the bevel base.

7. The hydraulic support for coal seams with an inclination angle of 50°-90° according to claim 4, characterized in that A frame adjustment guard plate is arranged on the side of the bevel top beam, a plurality of first side thrust cylinders are arranged between the frame adjustment guard plate and the bevel top beam, a frame adjustment beam is arranged on the side of the bevel base, a plurality of second side thrust cylinders are arranged between the frame adjustment beam and the bevel base.

8. The steeply inclined coal seam side-horizontal hydraulic support according to claim 4 is characterized in that The front end of the beveled top beam and the front end of the beveled base are both beveled to match the slope of the working surface, the rear end shielding cavity of the beveled base is inclined parallel to the front end of the beveled top beam and the front end of the beveled base, and the shielding plug hinged on the beveled top beam is hinged with the shielding cavity of the beveled base at a corresponding inclination.

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