Underground coal mine air door frame yielding protection device

Abstract

The utility model relates to the technical field of mines, and discloses a coal mine underground air door frame yielding protection device which comprises a supporting top plate (4) fixedly arranged on the end face of an air door frame (1), the supporting top plate (4) is fixedly connected with a hydraulic supporting column (5) towards the outside of the air door frame (1), and the hydraulic supporting column (5) is used for being compressed to contract and generate reverse resistance. The deformation of the air door frame (1) is reduced; baffles (3) are hinged to the four sides of the supporting top plate (4) and fixed to the four sides of the bottom end of the air door frame (1). The hydraulic supporting columns are telescopically adjusted to move up and down so as to buffer different pressures, and even under the condition that a roadway roof supporting structure generates large deformation, the deformation resistance and stability of a pressed device are improved, the pressure is properly adjusted, and the deformation of a door frame of the air door is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mine equipment, in particular to a yielding protection device for a mine air door frame underground in a coal mine. Background Art

[0002] An air door is one of the main ventilation facilities in a mine, which has functions such as separating ventilation airflows, preventing air current short - circuits, reasonably distributing air volume, and controlling mine disasters. At present, most of the air door frames underground in domestic coal mines are mainly made of wood, and their yielding performance is relatively poor. With the increase of the mine mining depth and the continuous improvement of the mechanization level, the mine pressure is constantly rising, and the ventilation facilities are extremely vulnerable to damage. The air door frame is deformed due to stress, which affects the normal opening of the air door. Even under the condition of existing support, the mine roadway will also have large deformations under high pressure, thus affecting the normal use of the air door. In order to ensure the safety of the roadway structure, it is often necessary to demolish the original structure and rebuild it, resulting in great safety risks and extremely high construction costs. Summary of the Invention

[0003] In order to overcome or alleviate one or more of the above - mentioned technical problems, the purpose of the utility model is to provide a yielding protection device for a mine air door frame underground in a coal mine. It uses a hydraulic support column to expand and contract to adjust its up - and - down movement to buffer different pressures received. Even in the case of large deformations of the roadway roof support structure, it is beneficial to improve the anti - deformation ability and stability of the compressed device, appropriately adjust the pressure, and reduce the deformation of the air door frame.

[0004] The utility model provides the following technical solutions:

[0005] A yielding protection device for a mine air door frame underground in a coal mine, characterized in that: it includes a support top plate (4) fixedly arranged on the end face of the air door frame (1), the support top plate (4) is fixedly connected with a hydraulic support column (5) towards the outside of the air door frame (1), the hydraulic support column (5) is used for being compressed and contracting to generate a reverse resistance to reduce the deformation of the air door frame (1); four sides of the support top plate (4) are all hinged with baffle plates (3), and the baffle plates (3) are fixed on the four sides of the bottom end of the air door frame (1).

[0006] In the above - mentioned embodiment, the initial supporting force of the hydraulic support column is determined according to the magnitude of the stress received by the actual air door.

[0007] According to some embodiments, connection shafts are fixedly arranged on four sides of the support top plate (4), and rotating parts corresponding to the connection shafts for hinging are fixedly arranged at the connection parts of the baffle plates (3), and the connection shafts are rotationally hinged in the rotating parts.

[0008] According to some embodiments, the connection shafts are welded to the support top plate (4); the rotating parts are fixed to the connection parts of the baffle plates (3) by screws.

[0009] According to some embodiments, the minimum height of the hydraulic support column (5) is 330 mm, and the maximum height is 550 mm.

[0010] According to some embodiments, the size of the supporting top plate (4) corresponds to the bottom surface size of the air door frame (1).

[0011] According to some embodiments, the supporting top plate (4) is fixed to the top of the hydraulic support column (5) by screws.

[0012] According to some embodiments, the baffle plate (3) is fixed to the four sides of the bottom end of the air door frame (1) by screws.

[0013] In the above embodiments, when the air door frame is placed on the supporting top plate, the baffle plate is erected, and fixing screws are inserted into the reserved hole positions to prevent the air door frame from generating lateral displacement.

[0014] According to some embodiments, the supporting top plate (4) and the hydraulic support column (5) are buried in the pre - dug holes outside the air door frame (1), and the depth of the holes is the same as the height of the supporting top plate (4).

[0015] According to some embodiments, the hydraulic support column (5) is an internally - pressurized hydraulic support column.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] The pressure - yielding protection device for the air door frame in the coal mine provided by the present utility model uses a hydraulic support column to expand and contract to adjust its up - and - down movement to buffer different pressures. Even in the case of large deformation of the roadway roof support structure, it is beneficial to improve the anti - deformation ability and stability of the pressure - bearing device, appropriately adjust the pressure, reduce the deformation of the air door frame, and ensure the safety and economy in the mine production process; the pressure - yielding protection device is convenient for disassembly, installation and maintenance, realizes automatic pressure - yielding, has a simple structure, is easy to manufacture, and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a pressure - yielding protection device for an air door frame in a coal mine provided by an embodiment of the present utility model.

[0019] Figure 2 is a schematic structural diagram of the baffle plate provided by an embodiment of the present utility model.

[0020] Figure 3 is a schematic structural diagram of the hydraulic support column provided by an embodiment of the present utility model.

[0021] Figure 4 is Figure 1Top view.

[0022] Figure 5 is Figure 1 Left view.

[0023] Figure 6 is Figure 1 Front view.

[0024] In the figure:

[0025] Air door frame 1; screw 2; baffle 3; supporting top plate 4; hydraulic support column 5; rotating part 6. Specific implementation mode

[0026] The following combines the embodiments and the drawings to describe the present utility model in detail. However, it should be understood that the embodiments and the drawings are only used for exemplary description of the present utility model, and cannot constitute any limitation to the protection scope of the present utility model. All reasonable transformations and combinations within the scope of the utility model concept of the present utility model fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and defined, the terms "set", "install", "connect", "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] The following further illustrates the present utility model with reference to the drawings.

[0029] Embodiment 1

[0030] As Figure 1 and Figures 4 - 6 , this embodiment provides a pressure-relieving protection device for an air door frame in a coal mine underground, which includes: a hydraulic support column 5 located at the bottom, and a supporting top plate 4 located above the hydraulic support column 5 and fixedly connected to the hydraulic support column 5 through screws.

[0031] Four sides of the bottom end of the air door frame 1 are fixedly provided with baffles 3, and the four baffles 3 are connected to the supporting top plate 4 by a hinge structure. As Figure 2 shown, the rotating parts of the baffle 3 are fixed to the baffle 3 by screws; as Figure 3 shown, the connecting shafts of the supporting top plate 4 are directly welded to the supporting top plate 4.

[0032] When the air door frame 1 is placed on the supporting top plate 4, the four-sided baffles 3 are erected, and the fixing screws 2 are screwed into the air door frame 1 to achieve the fixing effect.

[0033] The above-mentioned yielding protection device for the air door frame in coal mines specifically has the following applications:

[0034] The yielding protection device for the air door frame is arranged at the bottom of the air door frame. When the roadway roof sinks under the action of pressure, the top of the yielding protection device is pressed, and the hydraulic support column 5 shrinks, slowing down the movement trend of the air door frame 1. When the roadway pressure continues to increase, the hydraulic support column 5 continues to compress and deform, and the yielding protection device continues to play a role. Due to the existence of the hydraulic support column 5, the pressure between the air door frame and the roof is not released, but continues to increase appropriately under the specified load of the air door frame, so as to achieve the purpose of deformation and yielding within a reasonable range.

[0035] In this embodiment, the supporting top plate 4 of the yielding protection device has the same size as the bottom surface of the door frame, with a length of 200 mm and a width of 200 mm. The minimum height of the hydraulic support column 5 is 330 mm, the maximum height is 550 mm, and the adjustable height is 220 mm. When building the air door, a certain space needs to be reserved under the air door frame to ensure the installation of the yielding protection device. In addition to the installation of the anti-deformation device, the remaining gaps should be filled with compressible materials. The yielding protection device is installed in the area where the air door frame is greatly affected by the roadway stress. When the roadway surface undergoes large deformation under the action of pressure, the top of the anti-deformation device is pressed, and the hydraulic support column 5 shrinks, generating a reverse resistance to reduce the deformation degree of the air door frame.

[0036] Embodiment 2

[0037] In this embodiment, the hydraulic support column 5 is an internally pressurized hydraulic support column, and the working fluid is No. 5 hydraulic oil. When the prop is withdrawn, the hydraulic oil in the cylinder flows back into the inner cavity of the piston rod to form a closed cycle; there is no need for a pumping station and pipeline system for pressurization, thus reducing costs; there is no need for a power supply, with great flexibility and convenient operation.

[0038] As the roof pressure of the working face increases, the supporting top plate 4 sinks to varying degrees, and the roof pressure acting on the hydraulic support column 5 gradually increases. When the load borne by the hydraulic support column 5 has not reached the rated working resistance, the hydraulic support column 5 is in an elastic state. Generally, there is a compression deformation of no more than 10 mm and an elastic deformation of the steel.

[0039] When the load borne by the hydraulic support column 5 reaches the rated working resistance, the high-pressure oil in the cylinder of the hydraulic support column 5 enters the safety valve through the internal core pipe. The safety valve opens and the support column contracts, causing the roof support 4 to sink, and a new balance is formed for the roof pressure.

[0040] When the load acting on the hydraulic support column 5 by the roof support 4 decreases below the rated working resistance of the hydraulic support column 5, the oil pressure in the inner cavity of the hydraulic support column 5 decreases, and the safety valve closes automatically. During the entire working process of the hydraulic support column 5, the above situation occurs repeatedly, enabling the hydraulic support column 5 to always be in a constant resistance working state, thereby achieving the purpose of effectively protecting the air door frame 1.

[0041] The above embodiments are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A pressure relief protection device for a damper door frame in a coal mine, characterized in that: It comprises a supporting top plate (4) fixedly arranged on the end surface of a damper door frame (1), the supporting top plate (4) being fixedly connected to a hydraulic supporting column (5) facing the outside of the damper door frame (1), the hydraulic supporting column (5) being used to contract under pressure to generate reverse resistance and reduce deformation of the damper door frame (1); baffles (3) are hingedly connected to the four sides of the supporting top plate (4), and the baffles (3) are fixed to the four sides of the bottom end of the damper door frame (1).

2. According to claim 1, the coal mine underground air door frame pressure relief protection device is characterized by: The four sides of the supporting top plate (4) are fixedly provided with connecting shafts, and the connection of the baffle plate (3) is fixedly provided with a rotating member (6) hinged corresponding to the connecting shaft, and the connecting shaft is rotatably hinged inside the rotating member (6).

3. The pressure relief protection device for the air door frame of a coal mine underground according to claim 2 is characterized by: The connecting shaft is welded to the supporting top plate (4); and the rotating member is fixed to the connection point of the baffle plate (3) by means of screws.

4. The pressure relief protection device for the air door frame of a coal mine underground according to claim 1 is characterized in that: The minimum height of the hydraulic support column (5) is 330 mm and the maximum height is 550 mm.

5. The coal mine underground air door frame pressure relief protection device according to claim 1 is characterized by: The supporting top plate (4) and the bottom surface dimensions of the damper door frame (1) are correspondingly the same.

6. The pressure relief protection device for the air door frame of a coal mine underground according to claim 5 is characterized by: The supporting top plate (4) is fixed to the top of the hydraulic supporting column (5) by means of screws.

7. The coal mine underground air door frame pressure relief protection device according to claim 6, characterized in that: The baffle (3) is fixed to the four sides of the bottom end of the damper door frame (1) by means of screws.

8. The coal mine underground air door frame pressure relief protection device according to claim 1, characterized in that: The supporting top plate (4) and the hydraulic supporting column (5) are embedded in a hole pre-arranged on the outside of the damper door frame (1), and the depth of the hole is the same as the height of the supporting top plate (4).

9. The coal mine underground air door frame pressure relief protection device according to any one of claims 1 to 8, characterized in that: The hydraulic support column (5) is an internal injection type hydraulic support column.

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