Multifunctional hydraulic support

Abstract

A multifunctional hydraulic support comprises a base and a top beam, two sets of hydraulic lifting supporting columns are hinged to the front portion and the rear portion of the base respectively, the upper ends of the two sets of hydraulic lifting supporting columns are hinged to the top beam, a connecting rod mechanism is arranged between the two sets of hydraulic supporting columns, and the connecting rod mechanism comprises a first connecting rod hinged to the base. The end of the second connecting rod is hinged to the first connecting rod, the upper end of the second connecting rod is hinged to the top beam, vertical supporting rods are fixedly connected to the front portion and the rear portion of the base respectively, horizontal lateral hydraulic telescopic cylinders are fixedly connected to the vertical supporting rods, and lateral supporting rods are fixedly connected to the action ends of the hydraulic telescopic rods on the two vertical supporting rods respectively. The multifunctional support can provide large roof cutting supporting resistance in the vertical direction, can also conduct lateral supporting, has the anchor rod construction function and the grouting function, and can be used for maintaining the stability of roof cutting entry retaining surrounding rock in a severe deformation area.

Description

Technical Field

[0001] The utility model relates to a hydraulic support used in coal mining, in particular to a multi-functional hydraulic support, which can realize functions such as roof support, lateral support, bolt construction and grouting, and is particularly suitable for maintaining the stability of the severely deformed area of gob-side entry retaining along the cutting top. Background Art

[0002] The traditional coal mining method is to maintain the roadway in the mining area by leaving coal pillars. Two crossheadings need to be driven for each working face, and one coal pillar is left, resulting in a high heading rate per ten thousand tons and a low coal recovery rate. With the large-scale coal mining, the amount of coal resources is decreasing day by day, and the problems of high mining cost and low coal recovery rate caused by the traditional coal pillar leaving mining method are becoming increasingly prominent. Gob-side entry retaining is a coal pillar-free mining technology, which can cancel the coal pillars between sections, realize coal pillar-free mining, reduce the heading amount of roadway in the mining area, and improve the resource recovery rate. The traditional gob-side entry retaining often adopts the method of roadside filling, but the construction process is cumbersome, and the filling process will affect the mining speed, thus affecting the mine output. Cutting-top gob-side entry retaining is a new gob-side entry retaining technology. By cutting off the connection between the roof of the entry to be retained and the roof of the goaf, the strata in the goaf collapse to form the entry side and support the overlying strata, thus canceling the roadside filling and not affecting the face extraction speed, with obvious technical advantages. The surrounding rock deformation of cutting-top entry retaining has obvious stage characteristics. According to the deformation and stress evolution characteristics of the surrounding rock of the entry to be retained, the cutting-top entry retaining is divided into four regions: the advanced influence area, the severely deformed area, the area with slow deformation and the stable area of the entry to be retained (see Figure 5 ), among which in the severely deformed area, the coal seam has just been mined, the strata in the goaf are active and gradually collapse, and there is a huge additional subsidence force on the roof of the entry to be retained during the collapse process of the overlying strata, and the collapsed gangue has a strong impact on the retaining device beside the entry. If the deformation is too large during the severely deformed stage, it may cause the failure of the entry to be retained. Summary of the Invention

[0003] The purpose of the utility model is to overcome the above problems existing in the existing coal mining and provide a multi-functional hydraulic support.

[0004] To achieve the purpose of the utility model, the following technical solution is adopted: a multi-functional hydraulic support, including a base and a roof beam. Two sets of hydraulic lifting columns are respectively hinged on the base front and back, and the upper ends of the two sets of hydraulic lifting columns are both hinged on the roof beam. A connecting rod mechanism is arranged between the two sets of hydraulic columns. The connecting rod mechanism includes a first connecting rod hinged on the base, the end of a second connecting rod is hinged on the first connecting rod, and the upper end of the second connecting rod is hinged on the roof beam. Vertical support rods are respectively fixedly connected on the base front and back, a horizontally lateral hydraulic telescopic cylinder is fixedly connected on the vertical support rod, and lateral support rods are respectively fixedly connected to the action ends of the hydraulic telescopic rods on the two vertical support rods.

[0005] Furthermore, a grouting machine is installed near the middle of the base, and a hydraulic lifting column is installed at the tail of the base. The fuselage of the bolt drill is hinged to the action end of the hydraulic lifting column.

[0006] Furthermore, the lateral support rods are multiple and distributed vertically. Two horizontal lateral hydraulic telescopic cylinders are fixedly connected to each vertical support rod, and the connection lines of the four hydraulic telescopic cylinders form a rectangle.

[0007] The positive and beneficial technical effects of the present utility model are as follows: This multifunctional support can provide a large roof cutting support resistance vertically, can also perform lateral support, and is a multifunctional hydraulic support with bolt construction and grouting functions, which can be used to maintain the stability of the surrounding rock of the gob-side entry retaining in the severely deformed area. Brief Description of the Drawings

[0008] Figure 1 It is a three-dimensional schematic diagram of the multifunctional support.

[0009] Figure 2 It is a side view of the multifunctional support.

[0010] Figure 3 It is a rear view of the multifunctional support.

[0011] Figure 4 It is a connection diagram of the multifunctional supports.

[0012] Figure 5 It is a schematic diagram of the coal mining area. Detailed Description of the Embodiment

[0013] To more fully explain the implementation of the present utility model, implementation examples of the present utility model are provided. These implementation examples are only an elaboration of the present utility model and do not limit the scope of the present utility model.

[0014] The present utility model will be further explained in detail in conjunction with the attached drawings. The marks in the drawings are as follows: 1: base; 2: roof beam; 3: first connecting rod; 4: second connecting rod; 5: hydraulic lifting support column; 6: vertical support rod; 7: hydraulic telescopic cylinder; 8: lateral support rod; 9: hydraulic lifting column; 10: bolt drill; 11: grouting machine; 12: hinge plate.

[0015] As shown in the attached drawings, a multi-functional hydraulic support includes a base 1 and a top beam 2. Two sets of hydraulic lifting columns 5 are respectively hinged front and back on the base 1, and the upper ends of the two sets of hydraulic lifting columns are both hinged on the top beam 2. A connecting rod mechanism is arranged between the two sets of hydraulic columns. The connecting rod mechanism includes a first connecting rod 3 hinged on the base, the end of a second connecting rod 4 is hinged on the first connecting rod, and the upper end of the second connecting rod is hinged on the top beam. Vertically supporting rods 6 are respectively fixedly connected front and back on the base, and a horizontally lateral hydraulic telescopic cylinder 7 is fixedly connected on the vertically supporting rod 6. Lateral supporting rods 8 are respectively fixedly connected to the action ends of the hydraulic telescopic rods on the two vertically supporting rods. In this embodiment, the lateral supporting rods are multiple and distributed up and down, and two horizontally lateral hydraulic telescopic cylinders are fixedly connected to each vertically supporting rod, and the connection line of the four hydraulic telescopic cylinders is a rectangle. A grouting machine 11 is installed near the middle of the base, and a hydraulic lifting column 9 is installed at the tail of the base. The fuselage of an anchor drill 10 is hinged to the action end of the hydraulic lifting column through a hinge plate 12.

[0016] This multi-functional hydraulic support is towed behind the face end support (see Figure 5 , and the multi-functional support herein is the multi-functional hydraulic support of the present utility model), and 3 to 5 frames can be designed. The first 1 to 2 frames of supports may not be provided with cable bolt drills and grouting machines, which specifically depends on the caving situation of the gangue in the goaf. After the face is pushed forward, wire meshes and gangue retaining props (U-shaped steel or I-shaped steel) are arranged along the cutting seam line. At this time, the lateral supporting rods 8 of the multi-functional hydraulic support press against the gangue retaining props to provide lateral supporting force to the gangue retaining props and resist the impact force and extrusion force of the gangue in the goaf. The roof in the goaf begins to cave, and the multi-functional hydraulic support provides sufficient roof cutting resistance to ensure that the roof in the goaf caves smoothly along the cutting seam surface.

[0017] After the roof in the goaf completely caves, a cable bolt drill is used to construct grouting bolts into the goaf. 2 to 3 grouting bolts can be constructed in each vertical row. The position of the bolt construction can be adjusted by the lifting section of the hydraulic lifting column of the anchor drill, or the angle of the drill can be adjusted by rotating the hinge plate 12, so as to supplement and drill bolts for the roof. After the construction of the grouting bolts is completed, grout is injected into the grouting bolts through the grouting machine to reinforce the bolts and the side roadway of the goaf.

[0018] The automatic forward movement mechanism of this multi-functional hydraulic support: As the goaf advances forward, the multi-functional support also needs to move forward. Taking Figure 4Taking the No. 2 multi-functional hydraulic support (among the intermediate hydraulics) as an example, the automatic forward movement mechanism of the multi-functional hydraulic support is described. When the No. 2 multi-functional support needs to move forward, first, the hydraulic telescopic cylinder separates the lateral support rod 8 from the gangue retaining pillar. Then, while contracting the hydraulic rod between the No. 1 hydraulic support and the No. 2 hydraulic support, the hydraulic rod between the No. 2 hydraulic support and the No. 3 hydraulic support is extended, so that the No. 2 multi-functional hydraulic support automatically moves forward. After the movement is completed, the hydraulic telescopic cylinder is extended to make the lateral support rod provide lateral support for the gangue retaining pillar.

[0019] The above multi-functional hydraulic support is a support system applicable to the severely deformed area of gob-side entry retaining by roof cutting. It realizes functions such as roof cutting support behind the working face, lateral gangue retaining, grouting bolt construction, grouting, etc., realizes the smooth caving and maintenance of the roof, and further improves the strength and stability of the gob-side roadway through grouting, achieving good gob-side entry retaining effect.

[0020] After the embodiments of the present invention are described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent application. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention all belong to the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments described in the specification either.

Claims

1. A multifunctional hydraulic support, comprising a base and a top beam, two sets of hydraulic lifting supports are hinged on the base at the front and rear, the upper ends of the two sets of hydraulic lifting supports are hinged on the top beam, a connecting rod mechanism is arranged between the two sets of hydraulic supports, the connecting rod mechanism comprises a first connecting rod connected to the base, the end of the second connecting rod is hinged on the first connecting rod, and the upper end of the second connecting rod is hinged on the top beam, characterized in that: The base is fixedly connected with vertical support rods at the front and back, and horizontal lateral hydraulic telescopic cylinders are fixedly connected to the vertical support rods. The lateral support rods are fixedly connected to the action ends of the hydraulic telescopic rods on the two vertical support rods.

2. A multifunctional hydraulic support according to claim 1, characterized in that: A grouting machine is installed near the middle of the base, a hydraulic lifting column is installed at the tail of the base, and the body of the anchor drilling rig is hinged at the action end of the hydraulic lifting column.

3. A multifunctional hydraulic support according to claim 1, characterized in that: The lateral support rods are multiple and distributed vertically. Two horizontal lateral hydraulic telescopic cylinders are fixedly connected to each vertical support rod, and the connecting line of the four hydraulic telescopic cylinders is a rectangle.

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