Fully-mechanized face cantilever type coal mining machine onboard dust removal system and coal mining machine

Abstract

The invention relates to the field of fully-mechanized face dust prevention and control, and discloses a fully-mechanized face cantilever type coal mining machine onboard dust removal system and a coal mining machine. The dust removal system comprises a shaftless fan wet dust collector, a hydraulic telescopic rod assembly and a linkage control system, and the shaftless fan wet dust collector is arranged on the outer side of a roller and rotationally connected with a machine body through a dust collector swing arm; one end of the hydraulic telescopic rod assembly is hinged to a rocker arm of the coal mining machine, the other end of the hydraulic telescopic rod assembly is connected with a swing arm of the dust remover through a universal joint, and the linkage control system is connected with the hydraulic telescopic rod assembly, the rocker arm driving oil cylinder and the coal seam thickness sensor. The system further comprises a rocker arm integrated flame-proof electric control box, and triple protection of overload, electric leakage and overvoltage is arranged in the rocker arm integrated flame-proof electric control box. The dust remover can be dynamically close to a dust source and adapt to different coal seam thicknesses, collision and whole machine shutdown are avoided, and the dust treatment effect and operation safety are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust prevention and control in fully mechanized coal mining face, and in particular to a kind of dust removal system of cantilever type coal mining machine on board in fully mechanized coal mining face and coal mining machine. BACKGROUND

[0002] In the fully mechanized mining operation of thin and medium thick coal seam, the coal mining machine swing arm coal cutting is the core area of dust generation, with fast diffusion speed and high concentration, which poses a serious threat to the health and safety of underground workers. The current dust removal technology for this area still has many adaptability and safety short boards: On the one hand, the existing coal mining machine dust removal equipment is mostly fixedly installed on the machine body or the machine surface, and there is a certain distance (usually > 1.5 meters) from the dust generation point of the swing arm coal cutting. During the diffusion process, dust is easily mixed with air, resulting in a significant decrease in capture efficiency. Although some technologies attempt to place the dust collector close to the swing arm, due to the swing angle of the swing arm (0-90°) and the change in operating space height (thin coal seam ≤1.3 meters, medium thick coal seam 1.3-3.5 meters), the fixed-position dust collector cannot always be aligned with the dust source, and is easily collided with coal walls, supports and other equipment, resulting in equipment damage or interruption of operation.

[0003] On the other hand, the control and protection system of the existing coal mining machine swing arm is relatively independent: the extension and retraction of the swing arm cylinder mostly relies on manual operation on site, which has low operation accuracy and safety hazards under conditions of high dust concentration and limited visibility; at the same time, the power supply and protection of the dust removal equipment need to be connected to the machine body electric control system through additional wiring, which is easily affected by the swing arm vibration and dust erosion for a long time, and is prone to short circuit, open circuit failure, and lacks targeted power-off protection mechanism. Once the dust removal equipment is overloaded or has a leakage, it may cause the whole coal mining machine to stop, affecting the operation efficiency.

[0004] In addition, the power source of traditional dust removal equipment still has limitations: some equipment relies on high-pressure spray injection, which is greatly affected by water pressure fluctuations; some use shaft fans, which are large in size and difficult to maintain, and in the dynamic operation environment of the swing arm, the fan shaft is easily worn by dust, reducing the service life of the equipment.

[0005] Therefore, it is urgent to develop a dust removal system that is deeply integrated with the swing arm of the coal mining machine, adjustable in position, safe and reliable, and stable in power, to solve the above technical problems. SUMMARY

[0006] Therefore, the purpose of the present application is to solve the above problems and provide a kind of dust removal system of cantilever type coal mining machine on board in fully mechanized coal mining face and coal mining machine.

[0007] To achieve the above purpose, the present application provides the following technical solutions: A kind of dust removal system of cantilever type coal mining machine on board in fully mechanized coal mining face, comprising a shaftless fan wet dust collector, a hydraulic telescopic rod assembly and a linkage control system. The shaftless fan wet dust collector is arranged outside the drum of the coal mining machine and is rotationally connected to the machine body through a dust collector swing arm; one end of the hydraulic telescopic rod assembly is hingedly connected to the coal mining machine swing arm, and the other end is connected to the dust collector swing arm through a universal joint; The linkage control system is connected to the hydraulic telescopic rod assembly, the coal mining machine swing arm drive oil cylinder and the coal seam thickness sensor on the machine body, and according to preset conditions, the distance between the shaftless fan wet dust collector and the dust generation point of the drum is adjusted through the hydraulic telescopic rod assembly to make the shaftless fan wet dust collector be in the optimal dust removal position.

[0008] Further, the inlet and outlet of the coal mining machine swing arm drive oil cylinder is provided with an electromagnetic proportional valve and integrated displacement and pressure sensors, the linkage control system calculates the required height position of the shaftless fan wet dust collector according to the data fed back by the coal seam thickness sensor and the displacement and pressure sensors, and controls the extension and retraction of the hydraulic telescopic rod assembly to ensure that the shaftless fan wet dust collector is always in the optimal capture height.

[0009] Further, the hydraulic telescopic rod assembly is installed on the reserved base 1.2-1.5 m away from the cutting tooth on the side of the coal mining machine swing arm.

[0010] Further, it further includes a swing arm integrated electric control box, which adopts an explosion-proof and intrinsic safety design structure, is fixed in the non-working area of the swing arm, is internally provided with an overload protection module, an electric leakage protection module and an overvoltage protection module, and is directly connected to the shaftless fan wet dust collector and the hydraulic telescopic rod assembly through internal lines.

[0011] Further, the protection mode of the overload protection module is that the power supply of the dust removal system is cut off within 0.5 s when the motor current is greater than or equal to 1.2 times the rated value. The protection mode of the electric leakage protection module is that the circuit is tripped within 0.1 s when the shell electric leakage current is greater than or equal to 30 mA. The protection mode of the overvoltage protection module is that the circuit is disconnected when the power supply voltage fluctuates by ±10%. Only the power supply of the on-board dust removal system is cut off in case of failure, and the coal mining machine is not triggered to stop.

[0012] Further, the hydraulic telescopic rod assembly is driven by a double-acting hydraulic cylinder, and the extension and retraction stroke is 300-600 mm.

[0013] Further, the hydraulic telescopic rod assembly and the coal mining machine swing arm drive oil cylinder are provided with automatic and manual control modes, wherein: The automatic mode is that the linkage control system automatically controls the extension and retraction of the hydraulic telescopic rod assembly according to preset conditions; The manual mode is that the operator controls the extension and retraction of the hydraulic telescopic rod assembly through the remote key control of the underground operation platform or the ground monitoring system.

[0014] Further, the optimal capture height of the shaftless fan wet dust collector in the automatic mode is:

[0015] Wherein, is the basic height of the shaftless fan wet dust collector calculated according to the thickness difference of thin and medium-thick coal seams; is the modified height calculated by modifying the basic height based on the real-time swing angle of the shearer swing arm.

[0016] Further, when the coal seam thickness , ; when , ; , is the real-time swing angle of the shearer swing arm.

[0017] Further, the shearer swing arm drive oil cylinder is obtained by electrically controlling the original lifting oil cylinder under the shearer swing arm, and control valves are installed at the oil inlet and outlet of the oil cylinder, and sensors are integrated to feedback the oil cylinder extension length and load pressure in real time.

[0018] Further, the linkage control system is provided with a remote communication module.

[0019] Further, the hydraulic telescopic rod assembly shares the shearer hydraulic station with the shearer swing arm and is independently supplied with oil through a shunt valve.

[0020] A shearer comprises the on-board dust removal system of the fully-mechanized face cantilever shearer as described above.

[0021] The beneficial effects of the present application are: 1. The dust removal efficiency is greatly improved In the present application, the shaftless fan wet dust collector is arranged outside the drum, and the dust collector swing arm is rotationally connected with the machine body, and the hydraulic telescopic rod assembly is linked through the universal joint, so that it can dynamically approach the dust generation point and capture the dust before it is fully dispersed; the linkage control system adjusts the telescopic amount of the hydraulic telescopic rod in real time according to the feedback of the coal seam thickness sensor and the displacement / pressure sensor of the swing arm drive oil cylinder, so that the air inlet is always at the optimal capture height.

[0022] 2. The working condition adaptability is significantly enhanced, and it is suitable for full mining of thin and medium-thick coal seams ​The hydraulic telescopic rod assembly in the application is installed on the base 1.2-1.5 m away from the cutting tooth on the side of the swing arm, is driven by a double-acting hydraulic cylinder, has a telescopic stroke of 300-600 mm, shares a hydraulic station with a swing arm driving cylinder (the inlet and outlet are provided with electromagnetic proportional valves and integrated displacement / pressure sensors), is independently supplied with oil by a flow divider valve, and the linkage control system can adjust the height and position of the dust remover in real time according to the coal seam thickness and swing arm swing angle, and is suitable for different working conditions of thin and medium-thick coal seams.

[0023] 3. Greatly improved safety and reliability In the application, the swing arm integrated electric control box is fixed on the non-working area of the swing arm and is designed with explosion-proof and intrinsic safety, is provided with three protection modules of overload, leakage and overvoltage, and is directly connected with the shaftless fan wet dust remover and the hydraulic telescopic rod assembly through internal lines.

[0024] 4. Significantly improved operation convenience and intelligent level In the application, the linkage control system supports automatic and manual modes: in the automatic mode, the height and position of the dust remover are adjusted automatically according to preset conditions and sensor data; in the manual mode, the operator remotely controls the telescopic rod through the underground operation platform or the ground monitoring system (through the remote communication module) without entering the dust production area.

[0025] In summary, through the integrated design of swing arm rotation + hydraulic telescopic + sensor linkage + three power-off protection, the application realizes the machine-mounted dust removal target of accurate position, stable power, safe control and intelligent high efficiency, and provides a systematic solution for dust prevention and control of thin and medium-thick coal seam fully mechanized faces.

[0026] Other advantages, objects and features of the application will be explained in the following description, and will be apparent to those skilled in the art based on the following description, or can be taught from the practice of the application. The objects and other advantages of the application can be achieved and obtained by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to make the objects, technical solutions and advantages of the application clearer, the preferred detailed description of the application will be made below in combination with the drawings, in which: Fig. 1 It is a front view of the machine-mounted dust removal system of the cantilever type coal mining machine in the application.

[0028] Fig. 2 It is a top view of the machine-mounted dust removal system of the cantilever type coal mining machine in the application.

[0029] Fig. 3 It is a side view of the machine-mounted dust removal system of the cantilever type coal mining machine in the application.

[0030] Reference numerals in the attached drawings: 1-Coal mining machine body; 2-Coal mining machine drum; 3-Coal mining machine rocker arm; 4-Hydraulic telescopic rod assembly; 5-Shaftless fan wet dust collector. Detailed Implementation

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0033] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Example 1 like Figs. 1-3 As shown, this embodiment provides an onboard dust removal system for a cantilever coal mining machine in a fully mechanized longwall face, used in thin coal seams (mining height 1.0m). The system includes a shaftless fan wet dust collector 5, a hydraulic telescopic rod assembly 4, a linkage control system, and a rocker arm integrated electrical control box.

[0035] The shaftless fan wet dust collector 5 is installed on the outside of the coal mining machine drum 2, with its air inlet facing the cutting surface of the drum cutting teeth. It is rotatably connected to the coal mining machine body 1 through the dust collector swing arm, allowing the dust collector to swing within the range of 0° to 90° as the mining height changes.

[0036] The hydraulic telescopic rod assembly 4 is hingedly connected to a reserved base of the shearer rocker arm 3 at a position 1.2 m away from the cutting pick 1 on one end, and the reserved base is integrally welded with the shearer rocker arm and is provided with a damping pad; and the other end is connected to the middle section of the dust remover swing arm through a ball joint, so as to drive the shaftless fan wet dust remover 5 to swing.

[0037] The shearer rocker arm driving oil cylinder is transformed from an original lifting oil cylinder, and an electromagnetic proportional valve is installed at the oil inlet and the oil outlet respectively, and a magnetostrictive displacement sensor (precision ±1 mm) and a pressure sensor (range 0-35 MPa) are integrated in the middle of the cylinder body to real-time feedback the telescopic length and load pressure of the oil cylinder.

[0038] The linkage control system is connected with the hydraulic telescopic rod assembly 4, the rocker arm driving oil cylinder, the coal seam thickness sensor of the machine body and the remote communication module through a CAN bus.

[0039] The hydraulic telescopic rod assembly 4 is driven by a double-acting hydraulic cylinder, and the telescopic stroke is 300-600 mm. The hydraulic telescopic rod assembly 4 and the shearer rocker arm driving oil cylinder are provided with automatic and manual control modes, wherein: The automatic mode is that the linkage control system automatically controls the telescopic rod assembly according to the preset conditions; The manual mode is that the operator controls the telescopic rod assembly through the remote key of the underground operation platform or the ground monitoring system.

[0040] The optimal capture height of the shaftless fan wet dust remover in the automatic mode is:

[0041] Among them, is the basic height of the shaftless fan wet dust remover calculated according to the thickness difference of thin and medium-thick coal seams; is the corrected height calculated by correcting the basic height based on the real-time swing angle of the shearer rocker arm.

[0042] When the coal seam thickness is , ; when , ; , is the real-time swing angle of the shearer rocker arm.

[0043] The working process of the embodiment is as follows: When the coal seam thickness sensor detects (thin coal seam), the linkage control system enters the automatic mode, calculates the basic height ; the real-time swing angle of the rocker arm is , and the corrected height is calculated ​optimal capture height .

[0044] The system controls the rocker arm drive cylinder to extend and retract to the corresponding position, and simultaneously drives the hydraulic telescopic rod assembly 4 (double-acting hydraulic cylinder, stroke 400 mm) to extend 350 mm, so that the suction port of the shaftless fan wet dust collector 5 is 0.25 m away from the dust generation point and is aligned with the drum cutting surface.

[0045] The shaftless fan is started, a negative pressure of 2800 Pa is generated, the dust capture efficiency reaches 96%, and the outlet respiratory dust concentration is ≤1.8 mg / m 3 .

[0046] The rocker arm integrated electric control box is fixed to the non-working area of the rocker arm, adopts an explosion-proof and intrinsic safety design, and is internally provided with three protections: When the motor current reaches 1.2 times of the rated value, the dust removal system power is cut off within 0.5 s; When the shell leakage is greater than or equal to 30 mA, the circuit is tripped within 0.1 s; When the power supply voltage fluctuates by ±10%, the circuit is disconnected.

[0047] In case of failure, only the dust removal system is cut off, without affecting the traction and cutting of the coal mining machine.

[0048] Example 2 As shown in Figs. 1-3 , this embodiment is used in a fully mechanized working face of a medium-thick coal seam (mining height 2.5 m), the system structure is consistent with that of example 1, and the difference lies in the control logic and the telescopic parameters.

[0049] Coal seam thickness , the linkage control system calculates ; Rocker arm swing angle , ; Optimal capture height .

[0050] The system controls the rocker arm drive cylinder to extend and retract to the corresponding position, and simultaneously drives the hydraulic telescopic rod assembly 4 (double-acting hydraulic cylinder, stroke 400 mm) to extend 350 mm, so that the suction port of the shaftless fan wet dust collector 5 is 0.25 m away from the dust generation point and is aligned with the drum cutting surface.

[0051] In addition, the operator can switch to the manual mode through the underground operation table, and adjust the telescopic rod by ±30 mm through the button, so as to adapt to the undulation of the coal wall.

[0052] Example 3 This embodiment provides a coal mining machine, which comprises the on-board dust removal system of the fully mechanized face cantilevered coal mining machine in example 1.

[0053] Finally, it is to be explained that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. An on-board dust removal system of a cantilevered coal mining machine in a fully-mechanized coal mining face, characterized in that: It comprises a shaftless fan wet dust collector, a hydraulic telescopic rod assembly and a linkage control system. The shaftless fan wet dust collector is arranged outside the drum of the coal mining machine and is rotationally connected to the body of the coal mining machine through a dust collector swing arm. The linkage control system is connected to the hydraulic telescopic rod assembly, the coal mining machine rocker arm drive cylinder and the coal seam thickness sensor on the body of the coal mining machine.

2. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 1, characterized in that, The linkage control system adjusts the distance between the shaftless fan wet dust collector and the dust generating point of the drum through the hydraulic telescopic rod assembly according to preset conditions so that the shaftless fan wet dust collector is in the optimal dust removal position.

3. The cantilevered coal mining machine on-board dust removal system of the fully mechanized coal mining face according to claim 1, characterized in that, The inlet and outlet of the coal mining machine rocker arm drive cylinder are provided with electromagnetic proportional valves and integrated displacement and pressure sensors.

4. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 1, characterized in that, The linkage control system calculates the required height position of the shaftless fan wet dust collector according to the data fed back by the coal seam thickness sensor and the displacement and pressure sensors and controls the extension and retraction of the hydraulic telescopic rod assembly to ensure that the shaftless fan wet dust collector is always in the optimal capture height.

5. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 4, characterized in that, The hydraulic telescopic rod assembly is installed on the reserved base 1.2-1.5 m away from the cutting pick on the side of the coal mining machine rocker arm. It also comprises a rocker arm integrated electric control box which is fixed to the non-working area of the rocker arm and is internally provided with an overload protection module, an electric leakage protection module and an overvoltage protection module. The protection mode of the overload protection module is to cut off the power supply of the dust removal system within 0.5 s when the motor current is greater than 1.2 times the rated value. The protection mode of the electric leakage protection module is to trip within 0.1 s when the shell electric leakage current is greater than 30 mA.

6. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 2, characterized in that, The protection mode of the overvoltage protection module is to disconnect the circuit when the power supply voltage fluctuates by ±10%.

7. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 6, characterized in that, Only the power supply of the on-board dust removal system is cut off in case of failure without triggering the stop of the whole coal mining machine. The hydraulic telescopic rod assembly is driven by a double-acting hydraulic cylinder with an extension stroke of 300-600 mm. The hydraulic telescopic rod assembly and the coal mining machine rocker arm drive cylinder are provided with automatic and manual control modes.

8. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 7, characterized in that, The automatic mode is that the linkage control system automatically controls the extension and retraction of the hydraulic telescopic rod assembly according to preset conditions. Wherein, The basic height of the shaftless fan wet dust collector is calculated according to the thickness difference of thin and medium-thick coal seams; The basic height is corrected based on the real-time swing angle of the shearer swing arm The corrected height is calculated by angle correction.

9. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 8, characterized in that: When the thickness of the coal seam is ; ; when ; ; , is the real-time swing angle of the shearer boom.

10. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 2, characterized in that: The manual mode is that the operator controls the extension and retraction of the hydraulic telescopic rod assembly through the remote key of the underground operation platform or the ground monitoring system.

11. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 2, characterized in that: The optimal capture height of the shaftless fan wet dust collector in the automatic mode is 1.2-1.5 m.

12. The cantilevered coal winning machine on-board dust removal system of the fully mechanized coal mining face according to claim 1, characterized in that, The coal mining machine rocker arm drive cylinder is obtained by electric control transformation of the original lifting cylinder under the coal mining machine rocker arm.

13. A coal mining machine characterized by, The linkage control system is internally provided with a remote communication module. The hydraulic telescopic rod assembly and the coal mining machine rocker arm share the hydraulic station of the coal mining machine and are independently supplied with oil through a shunt valve. It comprises the on-board dust removal system of the fully-mechanized coal mining face cantilevered coal mining machine according to any one of claims 1-12.

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