End hydraulic support with function of protecting inherent support of crossheading of stope face

Abstract

The utility model relates to the field of end supporting of a stope face of an underground coal mine, in particular to an end (transition) hydraulic support with an inherent supporting function for protecting a gate road of the stope face. Comprising a front beam, a top beam, stand columns, oblique beams, up-down connecting rods and a base. Two rows of parallel bracket components are mounted at the tops of the front beam and the top beam; the trend of the support components is parallel to the front beam and the top beam, the two rows of support components are symmetrically distributed on the left side and the right side of the front-back center line of the front beam and the top beam, each row of support components is divided into two sections, one section is located on the front beam, and the other section is located on the top beam. According to the utility model, the inherent supporting performance of the crossheading of the coal mine stope working face can be protected, the situation that the supporting structure in the advanced pressure influence range at the joint of the working face emergency exit and the roadway is damaged firstly and then reinforced due to the fact that the anchor rod and the anchor cable are broken off when the end (transition) support supports the top plate is avoided, and intrinsic safety type control is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the end support field of the coal mining face of the underground coal mine, specifically to an end (transition) hydraulic support with the inherent support function of the crossheading of the coal mining face. BACKGROUND

[0002] The relevant regulations of Coal Mine Safety Regulations stipulate that the safety outlet of the coal mining face must be connected with the roadway within the scope of the advanced pressure influence, and the two ends of the working face must use end supports or other forms of support. Combined with the commonly used anchor net support, shed support, composite support and other forms of the coal mine roadway, and the relevant provisions of the Coal Mine Safety Production Standardization Management System, the length of the anchor rod exposed nut is 10-50mm (full thread anchor rod 10-100mm), and the length of the anchor cable exposed lock is 150-250mm. Therefore, there is a contradiction in the existing end support, that is, when the hydraulic support at the end is directly connected to the top during the mining process, the anchor rod and anchor cable above the roof beam are often broken, the original support structure reserved during excavation is damaged, and the end support is in a passive situation of being destroyed first and then reinforced. Therefore, the end support process needs to be further improved.

[0003] On the other hand, with the gradual decrease of the proven reserves growth rate of coal resources, gob-side entry retaining is a main direction of non-pillar mining, which can shorten the preparation time of the working face and effectively improve the coal recovery rate, and is widely used at present. The excavated roadway is retained for the purpose of ensuring the stability of the roadway surrounding rock, and the roadway support usually adopts the method of filling concrete support beside the roadway and anchor net support in the roadway. However, the existing end (transition) support will break the anchor rod and anchor cable above the roof beam when bearing load, which is easy to cause the roof separation, falling of the roof beam, and local caving in the crossheading, and increases the management workload of the gob-side entry retaining. Therefore, it is more and more important to develop an end (transition) hydraulic support that can protect the inherent support of the crossheading. UTILITY MODEL CONTENT

[0004] In order to protect the integrity of the inherent support of the crossheading of the coal mining face of the underground coal mine, avoid the breaking or bending of the anchor rod and anchor cable when the end (transition) support supports the roof, damage the original support performance, and cause the roof separation, falling of the roof beam, or local caving, the utility model provides an end hydraulic support with the inherent support function of the crossheading of the coal mining face.

[0005] The utility model discloses a hydraulic support of end with inherent support function of protecting recovery working face crossheading is realized by the following technical scheme: a kind of hydraulic support of end with inherent support function of protecting recovery working face crossheading, including front beam, roof beam, stand, inclined beam, upper and lower connecting rod, base;Two rows of parallel support components are installed in the top of front beam and roof beam;The trend of support component is parallel with front beam and roof beam, and two rows of support components are symmetrically distributed on the left and right sides of front beam and roof beam front and back center line, and there is also a gap between two rows of support components and the left and right sides of adjacent front beam and roof beam;Each row of support components is divided into two sections, one section is located on the front beam, and the other section is located on the roof beam.

[0006] There is a certain gap between two rows of support components, and there is also a gap between support component and the left and right sides of roof beam and front beam, so that the support components of adjacent hydraulic support also have a gap when being applied, so that the anchor rod and anchor cable on the roof can be staggered.

[0007] Further, the support component includes a steel plate with an isosceles trapezoidal cross section, and the upper base width of the trapezoid is less than one sixth of the width of the front beam or the roof beam.

[0008] Further, the steel plate inside located on the front beam is provided with four rib plates, and the steel plate inside located on the roof beam is provided with 11 rib plates.

[0009] Further, each row of support components includes support square wood arranged along the front and back trend of the front beam and the roof beam, and multiple pairs of hinged components arranged on the left and right sides of the support square wood.

[0010] Further, each pair of hinged components includes a pair of metal bases, a pair of metal baffles, a first pin shaft and a baffle ring, a pair of second pin shafts and baffle rings, and a bolt.

[0011] The utility model has the following beneficial effects:

[0012] 1. The utility model discloses a support structure can protect the inherent support performance of the coal mining face crossheading, avoid the anchor rod and anchor cable breakage when the end (transition) support supports the roof, cause the support structure in the advanced pressure influence range of the connection of the working face safety exit and roadway to fall into the situation of first destruction and then reinforcement, can protect the integrity of the original support of the roadway, realize the intrinsic safety type management and control.

[0013] 2. In the application along empty roadway of the coal mining face, the support can protect the inherent support performance of the roadway roof, avoid the crossheading roof separation, falling package, local caving and other phenomena with the coal mining advance, do not need to destroy first and then reinforce, reduce manpower and material resources, optimize the process structure, reduce the management difficulty.

[0014] 3. In the application along empty roadway of the coal mining face, the support can protect the inherent support performance of the roadway roof, avoid the crossheading roof separation, falling package, local caving and other phenomena with the coal mining advance, do not need to destroy first and then reinforce, reduce manpower and material resources, optimize the process structure, reduce the management difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model discloses a support structure can protect the inherent support performance of the coal mining face crossheading, avoid the anchor rod and anchor cable breakage when the end (transition) support supports the roof, cause the support structure in the advanced pressure influence range of the connection of the working face safety exit and roadway to fall into the situation of first destruction and then reinforcement, can protect the integrity of the original support of the roadway, realize the intrinsic safety type management and control.

[0016] Figure 2 The support member in example 1 is shown in the top view structure schematic diagram.

[0017] Figure 3 The support member in example 1 is shown in the side view structure schematic diagram.

[0018] Figure 4 The side view (sectional view) schematic diagram of the hinged member in example 2 is shown.

[0019] Figure 5 The top view (sectional view) schematic diagram of the hinged member in example 2 is shown.

[0020] Figure 6 The front view (sectional view) schematic diagram of the hinged member in example 2 is shown.

[0021] Figure 7 The side view structure schematic diagram of the support member in example 2 is shown.

[0022] Figure 8 The front view structure schematic diagram of the support member in example 2 is shown.

[0023] Figure 9 The top view structure schematic diagram of the support member in example 2 is shown.

[0024] Figure 10 The schematic diagram of example 1 is applied to the end support of the coal mining face crossheading.

[0025] Figure 11 The schematic diagram of example 2 is applied to the end support of the coal mining face crossheading.

[0026] 1-Front beam, 2-Top beam, 3-Column, 4-Inclined beam, 5-Upper and lower connecting rods, 6-Base, 7-Support component, 71-Steel plate, 72-Firming plate, 73-Supporting timber, 74-Hinged component, 741-Metal base, 742-Metal baffle, 743-First pin, 744-Second pin, 745-Bolt; 8-Goaf, 9-Slag retaining support, 10-Concrete wall for roadway retention, 11-Anchor bolt, 12-Anchor cable. Detailed Implementation

[0027] Example 1 Figures 1-3 As shown, an end hydraulic support with the inherent support function of protecting the longwall face roadway includes a front beam 1, a top beam 2, a column 3, an inclined beam 4, upper and lower connecting rods 5, and a base 6. Two rows of parallel support components 7 are installed on the top of the front beam 1 and the top beam 2. The direction of the support components 7 is parallel to that of the front beam 1 and the top beam 2. The two rows of support components 7 are symmetrically distributed on the left and right sides of the front and rear center lines of the front beam 1 and the top beam 2, and gaps are also left between the two rows of support components 7 and the adjacent left and right sides of the front beam 1 and the top beam 2. Each row of support components 7 is divided into two sections, one located on the front beam 1 and the other on the top beam 2. The support component 7 includes a steel plate 71 with an isosceles trapezoidal cross-section (which can be welded to the top of the top beam and the front beam), the width of the upper base of the trapezoid being less than one-sixth of the width of the front beam 1 or the top beam 2. The steel plate 71 is internally supported by multiple equally spaced stiffening plates 72 (welded to the top of the top beam and the front beam). The stiffening plate 72 is perpendicular to the direction of the support member 7; the steel plate 71 located above the front beam 1 has four stiffening plates 72 inside; the steel plate 71 located above the top beam 2 has 11 stiffening plates 72 inside.

[0028] Example 2 Figures 4-9As shown in the drawings, each column of support members 7 includes support square timber 73 (top higher than the hinge member) arranged along the front-to-back direction of the front beam 1 and the top beam 2, and a plurality of pairs of hinge members 74 (arranged at equal intervals in the front-to-back direction) arranged on the left and right sides of the support square timber 73; the hinge member 74 is L-shaped and includes a horizontal segment and a vertical segment, the hinge member 74 is fixed on the front beam 1 and the top beam 2 on the left and right sides of the support square timber 73 through the horizontal segment, and the vertical segment can rotate around the connection point of the horizontal segment, and a pin shaft passing through the support square timber 73 is fixed between the vertical segments of each pair of hinge members 74. Each pair of hinge members 74 includes a pair of metal bases 741 (horizontal segment), a pair of metal baffles 742 (vertical segment), a first pin shaft 743 and a retainer ring, a pair of second pin shafts 744 and a retainer ring, and a bolt 745; the pair of metal bases 741 of each pair of hinge members 74 are fixed on the left and right sides of the support square timber 73, the side of the pair of metal bases 741 away from the support square timber 73 is connected to the front beam 1 and the top beam 2 through the bolt 745, the side of the pair of metal bases 741 adjacent to the support square timber 73 is provided with front-to-back pin holes, the bottom of the pair of metal baffles 742 is also provided with front-to-back pin holes and is connected to the corresponding metal base 741 through the second pin shaft 744 and the retainer ring; the pair of metal baffles 742 is provided with left-to-right pin holes, the first pin shaft 743 passes through the pin holes and the support square timber 73 and positions the support square timber 73 through the retainer ring.

[0029] The height of the support member is determined according to actual conditions.

[0030] The utility model will be further described below in combination with the drawings.

[0031] As shown in the drawings, Figures 1-3 The load-bearing structure of the end (transition) hydraulic support is composed of a front beam 1, a top beam 2, a stand 3, an inclined beam 4, an upper and lower connecting rod 5, a base 6, and a support member 7 (the main structure of the hydraulic support is prior art). Among them, the support member 7 is the only contact member of the support of the top plate, which is two steel plates 71 with isosceles trapezoidal cross section, and the upper base width of the trapezoid is less than one sixth of the width of the support (front beam or top beam). On the one hand, the support member 7 can support the top plate in the gap of the anchor rod and anchor cable of the gateway, and on the other hand, it can meet the specific pressure requirement of the top plate; the inside of the support member 7 is supported by the rib plate 72 at equal intervals to enhance the stability of the support in cooperation with the trapezoidal structure. The front beam and the top beam (collectively referred to as the transition beam) of the hydraulic support function as force transmission elements in the utility model, and work together with the stand 3, the inclined beam 4, and the upper and lower connecting rod 5 to transmit force to the base 6.

[0032] At the same time, the anchor net support scheme of the gateway and the coal mining process should be designed to meet the original requirements and cooperate with the support member 7 to fully utilize the space between the anchors during the mining process of the end (transition) support.

[0033] As shown in Figure 10 The upper bottom width of each support member 7 is 220mm, the lower bottom width is 380mm, and the distance from the support center is 400mm. Due to the limitation of the transition beam, each side support member 7 is arranged in two sections on the transition beam, with the length of each section being 1200mm and 2900mm respectively. Four rib plates 72 are evenly arranged in the front section steel plate 71 of each side, and eleven rib plates 72 are evenly arranged in the rear section steel plate 71.

[0034] For the support structure of the embodiment 1 as described above, since the spacing of the support members has been fixed in advance before leaving the factory, the support scheme of the tunnel should be designed according to the spacing of the support members before the formation of the crossheading, for example:

[0035] A recovery roadway with a gross section width x height of 5800 x 3200mm is designed, and the roof of the roadway is arranged with an anchor rod-anchor cable support scheme. The first anchor rod 11 in each row is 100mm away from the coal wall of the working face, the anchor rod spacing is 1400mm, there are five anchor rods in each row, and the row spacing is 1000mm. The anchor rod tray size is 150mm x 150mm. The first anchor cable 12 in each row is 750mm away from the coal wall of the working face, the anchor cable spacing is 1500mm, there are four anchor cables in each row, and the row spacing is 2000mm. The anchor cable tray size is 300mm x 300mm. One and a half sets of transition supports are exposed on the fully mechanized top coal caving face, and the gob-side entry retaining technology is applied. In this way, the support members of the transition beam can support the roof in the gaps of the anchor rods and anchor cables, and provide a certain space allowance for the upward and downward sliding of the working face equipment. For the support load of 3m coal seam and 4m immediate roof, the pressure intensity borne by the top beam is generally 0.6MPa, and the compressive strength of the No.3 coal seam is generally 10MPa, which meets the requirement of the roof specific pressure. Figure 10 The hydraulic supports ① and ② are located at the crossheading port of the recovery working face, and the traditional hydraulic supports ③, ④ and ⑤ are used.

[0036] As shown in Figures 4-9 The hinge member is composed of a metal base, a metal baffle, an A-shaped pin shaft and a retaining ring, a B-shaped pin shaft and a retaining ring, and a bolt. The metal base of the hinge member is welded on the top of the front beam and the top beam of the hydraulic support, and is pre-drilled and threaded on the front beam and the top beam. The B-shaped pin shaft and the retaining ring are used to connect the metal base and the metal baffle. The support square wood is fixed in the middle of the metal baffle by the A-shaped pin shaft, and the roof pressure is transmitted to the bearing structure of the support. The metal base, the metal baffle and the B-shaped pin shaft adopt a hinge type connection, such as the metal base having two protruding parts in front and back, the shaft holes in front and back are opened on the protruding parts, the middle section between the two protruding parts is inserted into the metal baffle, and the pin holes are also opened on the middle section. Through the structure and the pin shaft, the metal baffle can rotate relative to the metal base, and the retaining ring is used for axial positioning.

[0037] The utility model discloses as the contact element between roadway roof and end (transition) support, according to the design of crossheading anchor net support and coal mining technology, through the relative position of adjusting metal base at support roof beam and the top of front beam, the support component of the utility model is symmetrically arranged at the top of support, the purpose of supporting roadway roof in the distance of anchor rod and anchor cable is realized, and the activity allowance of the upward and downward sliding of working face equipment is simultaneously provided. The size and wooden material of the support square wood ensure that the component meets the requirement of roof specific pressure when supporting.

[0038] As shown in Figure 11 According to the roadway of certain underground coal mine without specific support design in the driving stage, namely the crossheading raw section width x height = 5800 x 3200mm anchor rod-anchor cable support scheme in the mining face, the application of along empty roadway, and the mining technology of working face four column support cover type roof support, the utility model support component two rows of hinged components can be made according to the above mining technology, for example, the distance between two rows of hinged components and support center is 400mm, the distance between the metal baffle of each row of components is 220mm, the square wood height is 300mm, the front beam square wood length is 1200mm, and the roof beam square wood length is 2800mm. Thus, the roof can be supported in the gap of anchor rod and anchor cable, and the space allowance of the upward and downward sliding of working face equipment is provided, and the requirement of roof specific pressure is met. Figure 11 The hydraulic support of ① and ② is located at the crossheading port of mining face, and ③ and ④ adopt traditional hydraulic support.

Claims

1. A hydraulic end support with the function of protecting the inherent support of the longwall mining face roadway, comprising a front beam (1), a top beam (2), a column (3), an inclined beam (4), upper and lower connecting rods (5), and a base (6); characterized in that, Two rows of parallel support components (7) are installed on the top of the front beam (1) and the top beam (2); the direction of the support components (7) is parallel to the front beam (1) and the top beam (2), and the two rows of support components (7) are symmetrically distributed on the left and right sides of the front and rear center lines of the front beam (1) and the top beam (2), and there are also gaps between the two rows of support components (7) and the left and right sides of the adjacent front beam (1) and the top beam (2); each row of support components (7) is divided into two sections, one section is located on the front beam (1) and the other section is located on the top beam (2).

2. The end hydraulic support with the function of protecting the inherent support of the longwall face roadway as described in claim 1, characterized in that, The support component (7) includes a steel plate (71) with an isosceles trapezoidal cross section. The width of the upper base of the trapezoid is less than one-sixth of the width of the front beam (1) or the top beam (2). The steel plate (71) is supported by multiple stiffening plates (72) at equal intervals.

3. The end hydraulic support with the function of protecting the inherent support of the longwall face roadway as described in claim 2, characterized in that, The stiffeners (72) are perpendicular to the support members (7); the steel plate (71) above the front beam (1) has four stiffeners (72) inside; the steel plate (71) above the top beam (2) has (11) stiffeners (72) inside.

4. The end hydraulic support with the function of protecting the inherent support of the longwall face roadway as described in claim 1, characterized in that, Each column of support components (7) includes a support timber (73) arranged along the front and rear direction of the front beam (1) and the top beam (2), and multiple pairs of hinge components (74) arranged on the left and right sides of the support timber (73); the hinge component (74) is L-shaped and includes a horizontal section and a vertical section. The hinge component (74) is fixed to the front beam (1) and the top beam (2) on the left and right sides of the support timber (73) through the horizontal section. The vertical section can rotate around the connection point with the horizontal section. A pin is fixed between the vertical sections of each pair of hinge components (74) and passes through the support timber (73).

5. The end hydraulic support with the function of protecting the inherent support of the longwall face roadway as described in claim 4, characterized in that, Each pair of hinge components (74) includes a pair of metal bases (741), a pair of metal baffles (742), a first pin (743) and a retaining ring, a pair of second pins (744) and a retaining ring, and bolts (745); the pair of metal bases (741) of each pair of hinge components (74) are fixed to the left and right sides of the supporting square timber (73), and the side of the pair of metal bases (741) away from the supporting square timber (73) is connected to the front beam (1) and the top beam (2) by bolts (745). On the upper part, a pair of metal bases (741) have pin holes running in the front and back direction on one side near the supporting square timber (73). A pair of metal baffles (742) also have pin holes running in the front and back direction at the bottom and are connected to the corresponding metal bases (741) through the second pin (744) and the retaining ring. A pair of metal baffles (742) have pin holes running in the left and right direction. The first pin (743) passes through the pin holes and the supporting square timber (73) and is positioned by the retaining ring.

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