An advanced support with a buffer energy absorption device and a method of using the same

Abstract

The present invention relates to an advance support with a buffer energy absorption device and a method for using the same. A through-groove is formed on both end surfaces of a crossbeam and extends through the crossbeam. A connecting rod extending vertically is hinged in the through-groove. A buffer base is hinged to an adjustment cylinder located below the crossbeam and driving one connecting rod to rotate. The extended end of the adjustment cylinder is hinged to the bottom end of the connecting rod, and the adjustment cylinder is connected to a fluid supply system. The bottom end of the other connecting rod is hinged to a connecting assembly located below the crossbeam. The end of the connecting assembly away from the connecting rod is hinged to the buffer base. The top ends of the two connecting rods are hinged to a side beam located directly above the crossbeam. The two side beams are hinged to the ends away from the connecting rod, and the hinge axes extend longitudinally. The two side beams form an upwardly convex arc. The hinge axes of the connecting rod and the crossbeam extend longitudinally. The side beams are also provided with a plurality of long beams extending longitudinally and arranged transversely. The present invention is suitable for repeated vibrations caused by impact ground pressure, and is convenient for avoiding top plate pressure when the support is subjected to a large impact.

Description

Technical Field

[0001] The present invention relates to the field of mining, in particular to the field of mining support technology, and specifically refers to an advanced support with a buffer energy absorption device and a use method thereof. Background Art

[0002] Advance support, also known as advance support, is a support measure taken ahead of the excavation of the working face to ensure the stability of the tunnel engineering excavation working face.

[0003] In recent years, coal mine rock burst accidents have occurred frequently, posing a serious challenge to preventing and controlling rock burst. Traditionally, the primary method for preventing rock burst in tunnel advance supports involves installing high-flow safety valves on the hydraulic supports of the advance supports. This allows for rapid fluid release when the supports are subjected to severe impact, allowing the supports to quickly yield and absorb the impact energy.

[0004] It has been found in actual use that the traditional advanced stent has the following technical defects:

[0005] 1. Although the large flow safety valve can meet the requirements of releasing rock burst pressure, it cannot adapt to the repeated vibration characteristics of rock burst pressure;

[0006] 2. When the support is subjected to a large impact, the pillars quickly give way, and the overall fall of the advance support reduces the support capacity of the tunnel roof, which can easily cause the roof to fall and cause the support to fall. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention provides an advanced support with a buffering energy-absorbing device, which is suitable for repeated vibrations caused by impact ground pressure and facilitates avoiding top plate pressure when the support is subjected to a large impact.

[0008] The present invention is achieved through the following technical solution: an advance bracket with a buffer energy absorption device, comprising a buffer base frame with a crossbeam on the top, through slots arranged opposite to each other and passing through the crossbeam are formed on both end surfaces of the crossbeam, a connecting rod extending vertically is hinged in the through slot, the buffer base frame is hinged with an adjusting cylinder located below the crossbeam and driving one connecting rod to rotate, the extended end of the adjusting cylinder is hinged to the bottom end of the connecting rod, and the adjusting cylinder is connected to a fluid supply system, the bottom end of the other connecting rod is hinged to a connecting assembly located below the crossbeam, and the end of the connecting assembly away from the connecting rod is hinged to the buffer base frame;

[0009] The top ends of the two connecting rods are hinged to side beams located directly above the crossbeam. The two side beams are hinged at one end away from the connecting rod and the hinge axis extends longitudinally. The two side beams form an upwardly convex arc. The hinge axis of the connecting rod and the crossbeam extends longitudinally. The side beams are also provided with several long beams extending longitudinally and arranged transversely.

[0010] The two side beams, the connecting rod and the cross beam of the present invention form a triangular stable structure. The connecting rod, the cross beam and the adjustment cylinder form an adjustable triangular structure. The triangular structure improves stability.

[0011] When this solution is in use, when the tunnel roof comes under pressure, the pressure of the tunnel roof is transmitted to the connecting rod through the side beam, and the connecting rod is transmitted to the adjusting cylinder. When the roof pressure exceeds the safety valve pressure of the attitude adjustment cylinder, the safety valve of the attitude adjustment cylinder absorbs the roof pressure by discharging fluid. When the roof pressure disappears, since the working surface fluid supply system always provides hydraulic power to the adjusting cylinder, the adjusting cylinder always provides initial support force to the side beam through the connecting rod, thereby being suitable for repeated vibrations of impact ground pressure.

[0012] Preferably, there are two crossbeams arranged longitudinally, and there are two connecting assemblies and two adjusting cylinders, and the adjusting cylinders and the connecting assemblies are located on both sides of the side beams.

[0013] This preferred solution enhances the supporting force of the long beam by providing four connecting rods.

[0014] The connecting assembly comprises a hinged rod, and two ends of the hinged rod are respectively connected to the connecting rod and the buffer chassis.

[0015] Preferably, both the top and bottom surfaces of the through-groove bottom are located on the rotation path of the connecting rod. In this preferred solution, when the top plate continues to press, the adjustment cylinder continues to release pressure, causing the connecting rod and the crossbeam to reach a mechanical limit state, that is, the connecting rod can be placed on the crossbeam, and the crossbeam restricts the connecting rod from further rotation, thereby protecting the adjustment cylinder from damage.

[0016] At the same time, when the top plate continues to press, the top plate pressure is transmitted to the buffer frame through the long beam, connecting rod and cross beam, and the large-flow safety valve of the advance support column instantly releases fluid to avoid the top plate pressure.

[0017] A method for using an advance bracket with a buffer energy absorption device comprises the following steps:

[0018] When the tunnel roof is under pressure, the pressure of the tunnel roof is transmitted to the connecting rod through the side beam, and the connecting rod is transmitted to the adjustment cylinder. When the roof pressure exceeds the safety valve pressure of the attitude adjustment cylinder, the safety valve of the attitude adjustment cylinder absorbs the roof pressure by discharging fluid;

[0019] When the top plate continues to press, the adjusting cylinder continues to release pressure, so that the connecting rod and the crossbeam reach the mechanical limit state. That is, when the connecting rod is placed on the crossbeam, the crossbeam restricts the connecting rod from continuing to rotate, thereby protecting the adjusting cylinder from damage.

[0020] When the roof continues to press down, the roof pressure is transmitted to the buffer frame through the long beam, connecting rod and cross beam, and the large flow safety valve of the leading support column releases fluid instantly to avoid the roof pressure;

[0021] When the roof pressure disappears, since the hydraulic supply system of the working surface always provides hydraulic power to the adjusting cylinder, the adjusting cylinder always provides initial support force to the side beam through the connecting rod.

[0022] The beneficial effects of the present invention are as follows: the two side beams, the connecting rod and the cross beam form a triangular stable structure, and the connecting rod, the cross beam and the adjusting cylinder form an adjustable triangular structure, so the triangular structure improves stability; when the tunnel roof is under pressure, the pressure of the tunnel roof is transmitted to the connecting rod through the side beam, and the connecting rod is transmitted to the adjusting cylinder. When the roof pressure exceeds the safety valve pressure of the attitude adjustment cylinder, the safety valve of the attitude adjustment cylinder absorbs the roof pressure by discharging fluid. When the roof pressure disappears, the working surface fluid supply system always provides hydraulic power for the adjusting cylinder, and the adjusting cylinder always provides initial support force for the side beams through the connecting rod, so that it is suitable for repeated vibrations of impact ground pressure; by arranging that the top surface and the bottom surface of the groove bottom are both located on the rotation path of the connecting rod, the top beam limits the rotation of the connecting rod, so that the force of the connecting rod is transmitted to the buffer base through the top beam for further buffering. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 It is a left side schematic diagram of the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of the long beam and the side beam;

[0026] Figure 4 A three-dimensional schematic diagram of the present invention from one angle;

[0027] Figure 5 A three-dimensional schematic diagram of another angle of the present invention;

[0028] As shown in the figure:

[0029] 1. Side beam, 3. Cross beam, 4. Connecting rod, 5. Adjusting cylinder, 6. Buffer base, 7. Articulated rod. DETAILED DESCRIPTION

[0030] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0031] Refer to the attached Figure 1-5The present invention provides an advanced bracket with a buffer energy absorption device and a method for using the same. The buffer energy absorption device includes a buffer base frame with a cross beam 3 on the top. Both end surfaces of the cross beam 3 are provided with through grooves that are relatively arranged and pass through the cross beam 3. A connecting rod 4 extending vertically is hinged in the through groove. The buffer base frame is hinged with an adjusting cylinder 5 located below the cross beam 3 and driving a connecting rod 4 to rotate. The protruding end of the adjusting cylinder 5 is hinged to the bottom end of the connecting rod 4 and the adjusting cylinder 5 is connected to a liquid supply system. The adjusting cylinder is a single-acting cylinder and has a one-way lock and a safety valve. The adjusting cylinder is in a normal liquid supply state, that is, the liquid supply system of the working surface always provides hydraulic power for the adjusting cylinder.

[0032] The bottom end of the other connecting rod 4 is hinged to a hinged rod 7 located below the crossbeam 3 , and one end of the hinged rod 7 away from the connecting rod 4 is hinged to the buffer chassis.

[0033] The top ends of the two connecting rods 4 are hinged to the side beams 1 located directly above the cross beam 3. The two side beams 1 are hinged at one end away from the connecting rod 4 and the hinge axis extends longitudinally. The two side beams 1 form an upwardly convex arc. The hinge axis of the connecting rod 4 and the cross beam 3 extends longitudinally. The side beams 1 are also provided with several long beams extending longitudinally and arranged transversely.

[0034] There are two cross beams 3 , which are arranged longitudinally. There are two connecting assemblies and two adjusting cylinders 5 , and the adjusting cylinders 5 and the connecting assemblies are located on both sides of the side beam 1 .

[0035] The top surface and the bottom surface of the groove bottom are both located on the rotation path of the connecting rod 4.

[0036] The buffer base 6 includes two top beams extending longitudinally and arranged transversely, and two cross beams 3 extending longitudinally and arranged transversely are provided on the top beams. Both ends of the cross beams 3 are hinged with connecting rods 4, and a bottom beam arranged parallel to the top beam is provided below the top beam. Two hydraulic cylinders arranged longitudinally are provided on the bottom beam, and the extension shafts of the hydraulic cylinders are fixedly connected to the bottom surface of the top beam. A first hinge plate and a second intersection plate arranged vertically are also provided between the two hydraulic cylinders. The first hinge plate is located above the second hinge plate, and the top end of the first hinge plate is hinged to the bottom surface of the top beam, and the bottom end of the second hinge plate is hinged to the top surface of the bottom beam. The bottom end of the first hinge plate and the top end of the second hinge plate are hingedly connected, and the first intersection plate and the second intersection plate form an acute angle.

[0037] When the present invention is in use: when the tunnel roof is under pressure, the pressure of the tunnel roof is transmitted to the connecting rod 4 through the side beam 1, and the connecting rod 4 is transmitted to the adjustment cylinder. When the roof pressure exceeds the safety valve pressure of the attitude adjustment cylinder, the safety valve of the attitude adjustment cylinder absorbs the roof pressure by discharging fluid;

[0038] When the top plate continues to press, the adjusting cylinder continues to release pressure, so that the connecting rod 4 and the crossbeam 3 reach the mechanical limit state, that is, when the connecting rod 4 is placed on the crossbeam 3, the crossbeam 3 limits the connecting rod 4 from continuing to rotate, thereby protecting the adjusting cylinder from damage;

[0039] When the top plate continues to press, the top plate pressure is transmitted to the buffer chassis through the long beam, connecting rod 4, and cross beam 3, and the large flow safety valve of the leading support column instantly releases fluid to avoid the top plate pressure;

[0040] When the roof pressure disappears, since the hydraulic supply system of the working surface always provides hydraulic power for the adjusting cylinder, the adjusting cylinder always provides initial supporting force for the side beam 1 through the connecting rod 4.

[0041] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by adopting existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An advance bracket with a buffer energy absorption device, comprising a buffer chassis with a crossbeam (3) on the top, characterized in that: Both end surfaces of the crossbeam (3) are provided with through grooves that are oppositely arranged and pass through the crossbeam (3), and a connecting rod (4) extending vertically is hinged in the through groove. The buffer chassis is hinged with an adjusting oil cylinder (5) located below the crossbeam (3) and driving one connecting rod (4) to rotate. The extended end of the adjusting oil cylinder (5) is hinged to the bottom end of the connecting rod (4) and the adjusting oil cylinder (5) is connected to a liquid supply system. The bottom end of the other connecting rod (4) is hinged to a connecting assembly located below the crossbeam (3), and the end of the connecting assembly away from the connecting rod (4) is hinged to the buffer chassis. The top ends of the two connecting rods (4) are hinged to a side beam (1) located directly above the cross beam (3); the two side beams (1) are hinged at one end away from the connecting rod (4) and the hinge axis extends longitudinally; the two side beams (1) form an upwardly convex arc; the hinge axis of the connecting rod (4) and the cross beam (3) extends longitudinally; and the side beams (1) are further provided with a plurality of long beams extending longitudinally and arranged transversely; There are two crossbeams (3), which are arranged longitudinally. There are two connecting assemblies and two regulating oil cylinders (5), and the regulating oil cylinders (5) and the connecting assemblies are located on both sides of the side beam (1). The regulating oil cylinders are single-acting oil cylinders and have a one-way lock and a safety valve. The regulating oil cylinders are in a constant liquid supply state, that is, the liquid supply system of the working surface always provides hydraulic power for the regulating oil cylinders. The connecting assembly comprises a hinged rod (7), and two ends of the hinged rod (7) are respectively connected to the connecting rod (4) and the buffer chassis.

2. The advanced support with a buffer energy absorption device according to claim 1, characterized in that: The top surface and the bottom surface of the groove bottom are both located on the rotation path of the connecting rod (4).

3. The method for using the advance bracket with a buffer energy absorption device according to any one of claims 1-2, characterized in that: The following steps are involved: When the tunnel roof is under pressure, the pressure of the tunnel roof is transmitted to the connecting rod (4) through the side beam (1), and the connecting rod (4) transmits it to the regulating cylinder. When the roof pressure exceeds the safety valve pressure of the attitude regulating cylinder, the safety valve of the attitude regulating cylinder absorbs the roof pressure by discharging fluid. When the top plate continues to press, the regulating oil cylinder continues to release pressure, so that the connecting rod (4) and the cross beam (3) reach a mechanical limit state, that is, when the connecting rod (4) is placed on the cross beam (3), the cross beam (3) limits the connecting rod (4) from continuing to rotate, thereby protecting the regulating oil cylinder from damage; When the top plate continues to press, the top plate pressure is transmitted to the buffer chassis through the long beam, connecting rod (4), and cross beam (3), and the large flow safety valve of the leading support column instantly releases fluid to avoid the top plate pressure; When the top plate pressure disappears, since the hydraulic supply system of the working surface always provides hydraulic power to the regulating cylinder, the regulating cylinder always provides initial support force to the side beam (1) through the connecting rod (4).

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