A set of two mid-mounted top coal caving end brackets

Abstract

The present invention relates to a two-frame middle-mounted top coal caving end bracket, including a top beam assembly, a base assembly, a guide frame, a cable hanger and a side cantilever beam. The top beam assembly is connected to the base assembly through a column, the cable hanger is connected to the top beam assembly, and the guide frame and the side cantilever beam are respectively arranged on both sides of the top beam assembly; the top beam assembly is composed of a front beam, a front top beam, a middle top beam and a rear top beam, which are all left and right frame structures, and the base assembly is composed of a front support seat, a front base, a middle base and a rear base that are compatible with the left and right frame structures of the top beam assembly. The top coal caving end bracket provided by the present invention solves the problems of tunnel support efficiency and matching in the upgrading and reconstruction of old mines. The bracket has strong adaptability and can be used in conjunction with the mine's old basic brackets, transition brackets, scraper conveyors and other equipment, so that coal mining operations can be carried out safely and efficiently.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining support equipment, and in particular relates to a set of two mid-mounted top coal caving end supports. Background Art

[0002] my country has rich coal resources, mature comprehensive mining equipment, and increasingly perfect coal mining technology. With the shortage of energy, the pace of coal mining is accelerating, which puts forward higher requirements for the support and movement of the tunnel. For example, the support should be able to move automatically to speed up the moving speed and effectively support the tunnel. The previous support measures can no longer adapt to the current mining speed, and the safety performance is unstable. In order to reduce costs, only the equipment supporting the tunnel is upgraded so that it can be used in conjunction with the original equipment and can adapt to the wider tunnels of old mines.

[0003] With the development of coal mining technology, the types and quantities of cables in the working face are increasing. The advancement of the coal mining face has made the cables in the working face chute redundant. How to safely dispose of these extra cables has become a problem affecting coal mining efficiency. Most domestic mines install monorail cranes in the transport chute to store cables, but the cost is high and the geological conditions are also high. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the background technology and to provide a set of two mid-mounted top coal caving end supports to solve the problems of tunnel support efficiency and supporting facilities in the upgrading and transformation of old mines. The support has strong adaptability and can be used in conjunction with the mine's old basic supports, transition supports, scraper conveyors and other equipment to enable coal mining operations to be carried out safely and efficiently.

[0005] The object of the present invention is achieved in that:

[0006] A two-frame mid-mounted top coal caving end bracket comprises a top beam assembly, a base assembly, a guide frame, a cable hanger and a side cantilever beam. The top beam assembly is connected to the base assembly via a column, the cable hanger is connected to the top beam assembly, and the guide frame and the side cantilever beam are respectively arranged on both sides of the top beam assembly.

[0007] Furthermore, the top beam assembly is composed of a front beam, a front top beam, a middle top beam and a rear top beam, all of which are left and right frame structures. The front beam is connected to the front top beam through a front beam jack, and the cable hanger is arranged in the middle of the left and right frame structures between the front top beam and the middle top beam.

[0008] Furthermore, the base assembly is composed of a front support seat, a front base, a middle base and a rear base that are compatible with the left and right frame structures of the top beam assembly. The front support seat is connected to the front base through a push jack, and the left and right frame structures of the base assembly are connected through a lower connecting frame jack.

[0009] Furthermore, the left and right frames of the top beam assembly are connected via an upper connecting frame jack, the tail end of the rear top beam is connected to the rear rock baffle via a shielding beam, and the shielding beam is connected to the rear rock baffle via a rear rock baffle jack.

[0010] Furthermore, the front supporting seat is connected to the front base via a push jack, the front base is connected to the middle base via a front hinged bottom plate, and the middle base is connected to the rear base via a rear hinged bottom plate.

[0011] Furthermore, the lower end of the front beam is connected to the front base via an upper connecting rod and a lower connecting rod, and the upper connecting rod is hinged to the lower connecting rod.

[0012] Furthermore, two shielding beams and two rear rock baffles are provided, and the two shielding beams are respectively provided on the rear base connected through the front connecting rod and the rear connecting rod.

[0013] Furthermore, the guide frame and the side cantilever beam are arranged on one side of the top beam assembly close to the front beam, and three guide frames are arranged, and the three guide frames are respectively arranged at the front, middle and rear parts of one side frame of the top beam assembly, and the three guide frames are hingedly connected to the top beam assembly.

[0014] Furthermore, three side cantilever beams are provided, and the three side cantilever beams are respectively provided at the front, middle and rear parts of the other side frame of the top beam assembly, and the three side cantilever beams are all connected to the top beam assembly through side protection jacks.

[0015] Furthermore, the gap between the two shield beams is 50 mm to 100 mm.

[0016] Furthermore, eight columns are provided, and the columns adopt a telescopic structure.

[0017] Furthermore, the cable hangers are arranged in two groups, one group of cable hangers is arranged on a side close to the front top beam, and the other group of cable hangers is arranged on a side close to the middle top beam.

[0018] Furthermore, the width of the base support is 1.1m to 2.5m.

[0019] Furthermore, the height of the column is 1m to 4m.

[0020] Furthermore, the maximum coal placing height of the support meets:

[0021] L=(x+2Mcosα)sinα

[0022]

[0023] Where L is the maximum coal caving height (m), M is the average thickness of the coal seam (m), α is the inclination angle of the coal seam (°), x is the stress limit height of the tunnel support, and γ is the average density of the coal seam (kg / m3 ), H is the height of the bracket (m), is the internal friction angle of the interface between the coal seam and the top beam (°), P is the support resistance of the support (N), K is the pressure coefficient, and k is the stress concentration factor.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a two-frame mid-mounted top coal caving end support. When the coal mining machine cuts the coal once, the support push jack extends a step distance, drives the transfer machine forward a step distance through the front support seat, and then slightly lowers the right frame close to the coal wall, and then the right frame retracts the push jack to move the right frame forward by a step distance; the column of the right frame is raised to initially support the right frame, and the right frame is moved, and then the left frame is slightly lowered, and then the left frame retracts the push jack to move the left frame forward by a step distance, and the column of the left frame is raised to initially support the left frame, and the left frame is moved to complete a single working cycle.

[0026] 2. The present invention provides a two-frame mid-mounted top coal caving end support, and the left and right frames have symmetrical structures. By changing the installation positions of the guide frame and the side cantilever beam, the requirements for tunnel support on the left and right working faces can be met. It can be used in wider tunnels with broken roofs, and its side cantilever beam can improve the safety of roof support. The guide frame can make the end support perfectly matched with the old transition frame, thereby increasing the adaptability of the end support.

[0027] 3. The present invention provides a two-frame mid-mounted top coal caving end bracket, which adds a cable hanger for placing the excess chute cables as the working face advances, thereby providing better protection for the cables. The cable hanger can also be used to place other hoses.

[0028] 4. The present invention provides a two-frame mid-mounted top coal caving end bracket, wherein the base assembly is hingedly formed by five parts, namely a front base, a front hinged bottom plate, a middle base, a rear hinged bottom plate, and a rear base. The bending resistance of the base is improved and the base can adapt to the uneven changes of the bottom plate. At the same time, the base adopts a widened design to reduce the specific pressure of the bottom plate.

[0029] 5. The present invention provides a two-frame mid-mounted top coal caving end support, in which the gap between the left and right shielding beams is small, which greatly improves the gangue retaining capacity and provides a safe working space for the equipment. It adopts double telescopic columns with a large telescopic ratio and is applicable to a wide range of tunnel heights.

[0030] 6. The present invention provides a set of two center-mounted top coal caving end brackets, with inner and outer cantilever beams having the same structure and being interchangeable, thereby reducing maintenance costs and the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic diagram of a structure of a two-frame middle-mounted top coal caving end bracket.

[0032] Figure 2 The present invention is a schematic diagram of a two-frame mid-mounted top coal caving end bracket base assembly.

[0033] Figure 3 The present invention is a top view of a middle-mounted top coal caving end bracket of two brackets in a group.

[0034] In the figure: 1. front beam; 2. front beam jack; 3. column; 4. front top beam; 5. cable hanger; 6. middle top beam; 7. rear top beam; 8. shield beam; 9. rear baffle plate; 10. rear baffle jack; 11. front connecting rod; 12. upper connecting rod; 13. lower connecting rod; 14. front supporting seat; 15. push jack; 16. front base; 17. front hinged bottom plate; 18. middle base; 19. rear hinged bottom plate; 20. rear base; 21. lower connecting frame jack; 22. guide frame; 23. upper connecting frame jack; 24. side top guard jack; 25. side cantilever beam; 26. rear connecting rod. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] Combination Figure 1 , Figure 3 A two-frame middle-mounted top coal caving end bracket includes a top beam assembly, a base assembly, a guide frame 22, a cable hanger 5 and a side cantilever beam 25. The top beam assembly is connected to the base assembly through a column 3, the cable hanger 5 is connected to the top beam assembly, and the guide frame 22 and the side cantilever beam 25 are respectively arranged on both sides of the top beam assembly. The cable hanger 5 is used to place the extra chute cables as the working face advances, providing better protection for the cables, and the cable hanger can also place other hoses.

[0038] The top beam assembly is composed of a front beam 1, a front top beam 4, a middle top beam 6 and a rear top beam 7, all of which are left and right frame structures. The front beam 1 is connected to the front top beam 4 through a front beam jack 2, and the cable hanger 5 is arranged in the middle of the left and right frame structures between the front top beam 4 and the middle top beam 6. The left and right frames of the top beam assembly are connected through an upper connecting frame jack 23, and the tail end of the rear top beam 7 is connected to the rear baffle plate 9 through a shielding beam 8, and the shielding beam 8 is connected to the rear baffle plate 9 through a rear baffle jack 10.

[0039] There are two shielding beams 8 and two rear rock-blocking plates 9. The two shielding beams 8 are respectively connected to the rear base 20 through the front connecting rod 11 and the rear connecting rod 26. The gap between the left and right shielding beams 8 is small, which greatly improves the rock-blocking capacity and provides a safe working space for the equipment. The double telescopic columns 3 are adopted, with a large telescopic ratio and a wide range of applicable tunnel heights.

[0040] The guide frame 22 and the side cantilever beam 25 are arranged on one side of the top beam assembly close to the front beam 1. There are three guide frames 22, and the three guide frames 22 are respectively arranged at the front, middle and rear of one side frame of the top beam assembly. The three guide frames 22 are hinged to the top beam assembly. There are three side cantilever beams 25, and the three side cantilever beams 25 are respectively arranged at the front, middle and rear of the other side frame of the top beam assembly. The three side cantilever beams 25 are connected to the top beam assembly through the side guard jack 24. The left and right frame structures are symmetrical. By changing the installation positions of the guide frame 22 and the side cantilever beam 25, the requirements of the left and right working faces for tunnel support can be met. It can be applied to the broken roof and wider tunnels. Its side cantilever beam can improve the safety of the roof support. The guide frame 22 can make the end bracket perfectly match the old transition frame, increasing the adaptability of the end bracket.

[0041] Example 2

[0042] Combination Figure 1-2 A two-frame mid-mounted top coal caving end bracket includes a top beam assembly, a base assembly, a guide frame 22, a cable hanger 5 and a side cantilever beam 25. The top beam assembly is connected to the base assembly through a column 3, the cable hanger 5 is connected to the top beam assembly, and the guide frame 22 and the side cantilever beam 25 are respectively arranged on both sides of the top beam assembly.

[0043] The base assembly includes a front support seat 14, a front base 16, a middle base 18 and a rear base 20 which are compatible with the left and right frame structures of the top beam assembly. The front support seat 14 is connected to the front base 16 through a push jack 15, and the left and right frame structures of the base assembly are connected through a lower connecting frame jack 21; the front support seat 14 is connected to the front base 16 through a push jack 15, the front base 16 is connected to the middle base 18 through a front hinged bottom plate 17, and the middle base 18 is connected to the rear base 20 through a rear hinged bottom plate 19.

[0044] The lower end of the front beam 1 is connected to the front base 16 through the upper connecting rod 12 and the lower connecting rod 13, and the upper connecting rod 12 is hinged to the lower connecting rod 13. The shielding beam 8 and the rear baffle plate 9 are both provided with two, and the two shielding beams 8 are respectively provided on the rear base 20 connected through the front connecting rod 11 and the rear connecting rod 26.

[0045] The base assembly is hingedly connected by five parts, namely, a front base 16, a front hinged bottom plate 17, a middle base 18, a rear hinged bottom plate 19, and a rear base 20, which improves the bending resistance of the base and can adapt to the uneven changes of the bottom plate. At the same time, the base adopts a widened design to reduce the specific pressure of the bottom plate.

[0046] Example 3

[0047] Combination Figure 1-3 A two-frame mid-mounted top coal caving end bracket includes a top beam assembly, a base assembly, a guide frame 22, a cable hanger 5 and a side cantilever beam 25. The top beam assembly is connected to the base assembly through a column 3, the cable hanger 5 is connected to the top beam assembly, and the guide frame 22 and the side cantilever beam 25 are respectively arranged on both sides of the top beam assembly; the top beam assembly is composed of a front beam 1, a front top beam 4, a middle top beam 6 and a rear top beam 7, all of which are left and right frame structures. The front beam 1 is connected to the front top beam 4 through a front beam jack 2, and the cable hanger 5 is arranged in the middle of the left and right frame structures between the front top beam 4 and the middle top beam 6. The left and right frames of the top beam assembly are connected by an upper connecting frame jack 23, the tail end of the rear top beam 7 is connected to the rear rock baffle 9 through a shielding beam 8, and the shielding beam 8 is connected to the rear rock baffle 9 through a rear rock baffle jack 10; the base assembly includes a front supporting seat 14, a front base 16, a middle base 18 and a rear base 20 that are compatible with the left and right frame structures of the top beam assembly, the front supporting seat 14 is connected to the front base 16 through a push jack 15, and the left and right frame structures of the base assembly are connected through a lower connecting frame jack 21; the front supporting seat 14 is connected to the front base 16 through a push jack 15, the front base 16 is connected to the middle base 18 through a front hinged bottom plate 17, and the middle base 18 is connected to the rear base 20 through a rear hinged bottom plate 19.

[0048] The front support seat 14 is connected to the transfer machine. When the coal mining machine cuts the coal once, the push jack 15 of the support extends a step distance, drives the transfer machine forward a step distance through the front support seat 14, and then makes the right frame close to the coal wall drop slightly in height, then the right frame retracts the push jack 15, and the right frame also moves forward a step distance; the column 3 of the right frame is raised to make the right frame initially supported, and the right frame moving operation is completed, and then the left frame is slightly lowered in height, and then the left frame retracts the push jack 15, and the left frame also moves forward a step distance, and the column 3 of the left frame is raised to make the left frame initially supported, and the left frame moving operation is completed, completing a single working cycle.

[0049] Example 4

[0050] The maximum coal placing height of the support meets the following requirements:

[0051] L=(x+2Mcosα)sinα

[0052]

[0053] Where L is the maximum coal caving height (m), M is the average thickness of the coal seam (m), α is the inclination angle of the coal seam (°), x is the stress limit height of the tunnel support, and γ is the average density of the coal seam (kg / m 3 ), H is the height of the bracket (m), is the internal friction angle of the interface between the coal seam and the top beam (°), P is the support resistance of the support (N), K is the pressure coefficient, and k is the stress concentration factor.

[0054] Taking the geology of Hunan coal mines as an example, it has been calculated that when L is 3.5~7.8m, that is, the segmented horizontal height of the coal mine is 3.5~7.8m, the top coal of the entire height is unstable under the mine pressure and can be released to the maximum extent. In order to reduce the layout and transportation times of the working face and increase production, pre-splitting blasting, forced coal release and other methods are generally used to increase the crushing height of the top coal. The segmented horizontal height is 7.9m~11.5m.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, etc. made within the protection scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A set of two mid-mounted top coal caving end supports, characterized in that: The utility model comprises a top beam assembly, a base assembly, a guide frame (22), a cable hanger (5) and a side cantilever beam (25), wherein the top beam assembly is connected to the base assembly via a column (3), the cable hanger (5) is connected to the top beam assembly, and the guide frame (22) and the side cantilever beam (25) are respectively arranged on both sides of the top beam assembly; The top beam assembly is composed of a front beam (1), a front top beam (4), a middle top beam (6) and a rear top beam (7), all of which are left and right frame structures; the front beam (1) is connected to the front top beam (4) via a front beam jack (2); and the cable hanger (5) is arranged in the middle of the left and right frame structures between the front top beam (4) and the middle top beam (6); The base assembly is composed of a front support seat (14), a front base (16), a middle base (18) and a rear base (20) adapted to the left and right frame structures of the top beam assembly. The front support seat (14) is connected to the front base (16) via a push jack (15), and the left and right frame structures of the base assembly are connected via a lower connecting frame jack (21). The left and right frames of the top beam assembly are connected via an upper connecting frame jack (23); the tail end of the rear top beam (7) is connected to the rear baffle plate (9) via a shielding beam (8); the shielding beam (8) is connected to the rear baffle plate (9) via a rear baffle jack (10); two shielding beams (8) and two rear baffle plates (9) are provided, and the two shielding beams (8) are respectively provided on the rear base (20) via a front connecting rod (11) and a rear connecting rod (26); The gap between the two shield beams is 50mm-100mm; there are eight columns, and the columns adopt a telescopic structure; there are two groups of cable hangers, one group of which is arranged on the side close to the front top beam, and the other group of which is arranged on the side close to the middle top beam; The width of the base support is 1.1m to 2.5m; the height of the column is 1m to 4m; the maximum coal placement height of the support meets the following requirements: L=(x+2Mcosα)sinα Among them, L is the maximum coal caving height (m), M is the average thickness of the coal seam (m), α is the inclination angle of the coal seam (°), x is the stress limit height of the tunnel support, and γ is the average density of the coal seam. Degree (kg / m 3 ), H is the height of the support (m), φ is the internal friction of the interface between the coal seam and the top beam plate The rubbing angle (°), P is the support resistance of the support (N), K is the pressure coefficient, and k is the stress concentration coefficient.

2. A two-frame middle-mounted top coal caving end support according to claim 1, characterized in that: The front support seat (14) is connected to the front base (16) via a push jack (15). The front base (16) is connected to the middle base (18) via a front hinged bottom plate (17), and the middle base (18) is connected to the rear base (20) via a rear hinged bottom plate (19).

3. A two-frame middle-mounted top coal caving end support according to claim 1 or 2, characterized in that: The lower end of the front beam (1) is connected to the front base (16) via an upper connecting rod (12) and a lower connecting rod, and the upper connecting rod (12) is hingedly connected to the lower connecting rod (13).

4. The two-frame middle-mounted top coal caving end support according to claim 1 is characterized in that: The guide frame (22) and the side cantilever beam (25) are arranged on one side of the top beam assembly close to the front beam (1), and three guide frames (22) are provided.

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