Fixed screening and crushing device in underground coal mines

Abstract

A fixed screening and crushing device for underground coal mines, which relates to the technical field of underground coal mine equipment, is arranged between the chute belt conveyor and the main transport belt conveyor, and includes a supporting shell, a screening device, a crushing device, and a material guide plate. After being mined together with small pieces of coal, large pieces of coal in the form of flakes or strips are conveyed by the chute belt conveyor, and then passed through this device, where they are first screened, and the small pieces of coal are first conveyed to the main transport belt conveyor, and the large pieces of coal are directly conveyed to the crushing device. The crushing device only crushes the large pieces of coal, which can relatively ensure that the large pieces of coal are crushed completely. The crushed large pieces of coal then enter the main transport belt conveyor, avoiding the blockage and tearing of the main transport belt conveyor, and relatively improving the output efficiency of the coal mine.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal mine equipment, and in particular to a fixed screening and crushing device underground in a coal mine. Background Art

[0002] As the construction of large-scale coal bases has begun to show results, the integration and transformation of small and medium-sized coal mines has made significant progress, and the number of large mines has gradually increased. However, since large mines generally have a large mining height and a high block rate on the working face, it is very easy to form large pieces of coal in the form of flakes or long strips. Large pieces of coal enter the chute crushing link together with small pieces of coal for crushing, resulting in the chute crushing link being unable to effectively crush only large pieces of coal. As a result, large pieces of coal enter the subsequent belt conveyor system without being completely crushed, causing the belt conveyor system to get stuck, especially at the various transfer points of the belt conveyor system, which are prone to getting stuck and even causing the conveyor belt of the belt conveyor system to tear, seriously restricting the high-yield and efficient operation of coal mines. Summary of the invention

[0003] In view of this, it is necessary to provide a fixed screening and crushing device in a coal mine for separating large lumps of coal from small lumps of coal and then crushing the large lumps of coal.

[0004] A fixed screening and crushing device in an underground coal mine is arranged between a chute belt conveyor and a main transport belt conveyor, and comprises a supporting shell, a screening device, a crushing device, and a guide plate. The upper part of the supporting shell is connected with the chute belt conveyor so that coal blocks of different sizes transported by the chute belt conveyor can enter the interior of the supporting shell, and the screening device is fixed inside the supporting shell. The screening device is located at the lower part of the chute belt conveyor, and the screening device is located at the upper part of the crushing device and the guide plate, and is located directly above the guide plate. One end of the guide plate is fixed on the inner wall of the supporting shell, and the other end of the guide plate is aligned with the main transport belt conveyor, and one end of the guide plate is higher than the other end. The crushing device is also located directly above the main transport belt conveyor, so that small pieces of coal pass through the screening device and fall on the guide plate, and slide along the guide plate to the main transport belt conveyor, and large pieces of coal are driven by the screening device to the crushing device for crushing, and the small pieces of coal produced after crushing pass through the crushing device and fall on the main transport belt conveyor.

[0005] Preferably, the screening device includes a rotating shaft, a predetermined number of screen bars, and a first driver. The screen bars are fixed on the rotating shaft and evenly distributed along the axial direction of the rotating shaft. The screen bars are perpendicular to the rotating shaft so that the screen bars are driven to rotate by the rotation of the rotating shaft. There is a gap between every two screen bars so that when the screen bars rotate, small pieces of coal pass through the gap between the two screen bars, and large pieces of coal are driven by the screen bars to the crushing device for crushing. The first driver is fixed on the inner wall of the supporting shell, and the driving end of the first driver is fixedly connected to the rotating shaft to provide power for the rotating shaft.

[0006] Preferably, the predetermined number of screen bars are divided into a predetermined number of groups, and the screen bars in each group are evenly distributed along the radial direction of the rotating shaft.

[0007] Preferably, the crushing device includes a predetermined number of crushing rollers and a second driver. There is a gap between every two crushing rollers so that large pieces of coal can be crushed by the crushing rollers, and small pieces of coal produced after crushing pass through the gap between the two crushing rollers and fall onto the main belt conveyor. The driving end of the second driver is fixedly connected to the crushing roller to provide power for the crushing roller.

[0008] Preferably, the screening device also includes a predetermined number of adjusting tooth plates, which are connected to the screen bars and are perpendicular to each other, and the gap areas surrounded by the adjusting tooth plates and the screen bars are used to screen large coal and small coal, so that small coal can pass through the gap areas surrounded by the adjusting tooth plates and the screen bars.

[0009] Preferably, the adjusting tooth plate is movably connected to the screen bars so that the adjusting tooth plate can move along the length direction of the screen bars, thereby changing the size of the gap area surrounded by the adjusting tooth plate and the screen bars, and further changing the size of the coal blocks that the screening device can screen.

[0010] Preferably, the screening device also includes a predetermined number of cleaning brushes, which are fixed inside the supporting shell and close to the screen bars. When the screen bars are rotated by the rotating shaft, the cleaning brushes pass between two screen bars to clean the coal slag attached between the two screen bars.

[0011] Preferably, the screen bars are arc-shaped.

[0012] The present invention adopts the above technical scheme, and its beneficial effect lies in that: after the large pieces of coal in the form of flakes or long strips are mined together with the small pieces of coal and transported through the chute belt conveyor, they are first screened through the device, and the small pieces of coal are first transported to the main belt conveyor, and the large pieces of coal are directly transported to the crushing device. The crushing device only crushes the large pieces of coal, which can relatively ensure that the large pieces of coal are completely crushed. The crushed large pieces of coal then enter the main belt conveyor, avoiding the blockage or tearing of the main belt conveyor, and relatively improving the output efficiency of the coal mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the front view of the fixed screening and crushing device in the coal mine.

[0014] Figure 2 This is the front view of the fixed screening and crushing device in the coal mine, which cooperates with the chute belt conveyor and the main transport belt conveyor.

[0015] Figure 3 A side view of the screening device.

[0016] Figure 4 This is the main view of the coordination of the rotating shaft, screen bars and adjustable screen plate.

[0017] In the figure: a fixed screening and crushing device 10 in an underground coal mine, a chute belt conveyor 30, a main belt conveyor 20, a supporting shell 40, a screening device 50, a rotating shaft 51, screen bars 52, a first drive 53, an adjusting screen plate 54, a cleaning brush 55, a crushing device 60, a crushing roller 61, a shell 62, and a material guide plate 70. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Please see Figure 1 to Figure 2 The embodiment of the present invention provides a fixed screening and crushing device 10 in a coal mine, which is arranged between a chute belt conveyor 30 and a main conveying belt conveyor 20, and includes a supporting shell 40, a screening device 50, a crushing device 60, and a guide plate 70. The upper part of the supporting shell 40 is connected to the chute belt conveyor 30, so that the coal blocks of different sizes conveyed by the chute belt conveyor 30 enter the supporting shell 40. The screening device 50 is fixed inside the supporting shell 40. The screening device 50 is located at the lower part of the chute belt conveyor. The screening device 50 is located between the crushing device 60, the guide plate 70, and the upper part of the supporting shell 40 is connected to the chute belt conveyor 30, so that the coal blocks of different sizes conveyed by the chute belt conveyor 30 enter the supporting shell 40. 0, and is located directly above the guide plate 70, one end of the guide plate 70 is fixed on the inner wall of the support shell 40, the other end of the guide plate 70 is aligned with the main conveyor belt conveyor 20, and one end of the guide plate 70 is higher than the other end, and the crushing device 60 is also located directly above the main conveyor belt conveyor 20, so that small pieces of coal pass through the screening device 50 and fall on the guide plate 70, and slide along the guide plate 70 to the main conveyor belt conveyor 20, and the large pieces of coal are driven by the screening device 50 to the crushing device 60 for crushing, and the small pieces of coal produced after crushing pass through the crushing device 60 and fall on the main conveyor belt conveyor 20.

[0020] Please see Figure 1 , Figure 3 , Figure 4 Furthermore, the screening device 50 includes a rotating shaft 51, a predetermined number of screen bars 52, and a first driver 53. The screen bars 52 are fixed on the rotating shaft 51 and are evenly distributed along the axial direction of the rotating shaft 51. The screen bars 52 are perpendicular to the rotating shaft 51 so that the rotating shaft 51 can drive the screen bars 52 to rotate. There is a gap between every two screen bars 52 so that when the screen bars 52 rotate, small pieces of coal pass through the gap between the two screen bars 52, and large pieces of coal are driven by the screen bars 52 to the crushing device 60 for crushing. The first driver 53 is fixed on the inner wall of the supporting shell 62, and the driving end of the first driver 53 is fixedly connected to the rotating shaft 51 to provide power for the rotating shaft 51.

[0021] Please see Figure 3 Furthermore, the screen bars 52 are divided into 7 groups, each group has 6 screen bars 52, and each group of screen bars 52 is evenly distributed along the radial direction of the rotating shaft 51.

[0022] Please see Figure 1 , Figure 2 Further, the crushing device 60 includes two crushing rollers 61 and a second driver. There is a gap between each two crushing rollers 61 so that large pieces of coal are crushed by the crushing rollers 61. The small pieces of coal produced after crushing pass through the gap between the two crushing rollers 61 and fall onto the main conveyor belt conveyor 20. The driving end of the second driver is fixedly connected to the crushing roller 61 to provide power to the crushing roller 61. The distance between the axis of the rotating shaft 51 and the center between the two crushing rollers 61 is 1500 mm.

[0023] Please see Figure 3 Furthermore, the screening device 50 also includes 7 adjusting tooth plates 54, each of which is arranged at a group of screen bars 52, and the adjusting tooth plates 54 are connected to the screen bars 52 and the two are perpendicular to each other. The gap area surrounded by the adjusting tooth plates 54 and the screen bars 52 is used to screen large pieces of coal and small pieces of coal, so that small pieces of coal can pass through the gap area surrounded by the adjusting tooth plates 54 and the screen bars 52.

[0024] Please see Figure 3 Furthermore, the adjusting tooth plate 54 is movably connected to the screen bars 52 so that the adjusting tooth plate 54 can move along the length direction of the screen bars 52, thereby changing the size of the gap area surrounded by the adjusting tooth plate 54 and the screen bars 52, and then changing the size of the coal blocks that the screening device 50 can screen.

[0025] Please see Figure 3 Further, the screening device 50 further includes a predetermined number of cleaning brushes 55, which are fixed inside the supporting shell 40 and close to the screen bars 52. When the screen bars 52 are driven to rotate by the rotating shaft 51, the cleaning brushes 55 pass between two screen bars 52 to clean the coal slag attached between the two screen bars 52. The cleaning brushes 55 are arranged below the adjusting tooth plate 54 so that the adjusting tooth plate 54 does not contact the adjusting tooth plate 54 when the adjusting tooth plate 54 is driven to rotate by the rotating shaft 51. The number of cleaning brushes 55 is one less than the number of screen bars 52. When the screen bars 52 are parallel to the cleaning brushes 55, the distance between each cleaning brush 55 and the two nearest screen bars 52 is equal, and the distance between the cleaning brush 55 and the rotating shaft 51 is 300 mm.

[0026] Please see Figure 1 , Figure 2Furthermore, the crushing device 60 further includes a shell 62, the crushing roller 61 is rotatably connected to the inner wall of the shell 62, the second driver is fixed to the inner wall of the shell 62, the shell 62 is fixed to the supporting shell 40, the top and bottom of the shell 62 are open, and the gap between the crushing roller 61 and the shell 62 is 1 to 2 cm to prevent the large pieces of coal that are not completely crushed from passing through the gap between the crushing roller 61 and the shell 62. The distance between each two crushing rollers 61 is adjustable.

[0027] Please see Figure 4 Furthermore, the screen bars 52 are curved.

[0028] Furthermore, the inclination angle of the guide plate 70 is 30° to 60°.

[0029] Furthermore, the coal passing capacity of the screening device 50 is ≥4000t / h; the crushing capacity of the crushing device 60 is ≥1500t / h;

[0030] When the device is used, the distance between each two crushing rollers 61 is adjusted according to the crushing needs, and the mined coal blocks of different shapes and sizes, including flakes and strips of coal, are transported to the chute belt conveyor 30, and the first driver 53 and the second driver are started. The coal blocks are transported from the chute belt conveyor 30 to the screening device 50, and the screening device 50 rotates for screening. Small pieces of coal pass through the gap area between the screen bars 52 and the adjusting tooth plate 54 and fall on the guide plate 70, slide along the guide plate 70 to the main conveyor belt conveyor 20 for transportation, and large pieces of coal are transported to the crushing device 60 together with the rotating screen bars 52 and the adjusting tooth plate 54. The crushing device 60 crushes the large pieces of coal, and the crushed large pieces of coal pass through the gap between the two crushing rollers 61 and fall on the main conveyor belt conveyor 20 for transportation.

[0031] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A fixed screening and crushing device in a coal mine, arranged between a chute belt conveyor and a main belt conveyor, characterized in that: It includes a supporting shell, a screening device, a crushing device, and a guide plate. The upper part of the supporting shell is connected to the chute belt conveyor so that coal blocks of different sizes transported by the chute belt conveyor can enter the interior of the supporting shell. The screening device is fixed inside the supporting shell. The screening device is located at the lower part of the chute belt conveyor. The screening device is located at the upper part of the crushing device and the guide plate, and is located directly above the guide plate. One end of the guide plate is fixed to the inner wall of the supporting shell, and the other end of the guide plate is aligned with the main conveyor belt conveyor, and one end of the guide plate is higher than the other end. The crushing device is also located directly above the main conveyor belt conveyor so that small pieces of coal pass through the screening device and fall on the guide plate, and slide along the guide plate to the main conveyor belt conveyor. Large pieces of coal are driven by the screening device to the crushing device for crushing, and the small pieces of coal produced after crushing pass through the crushing device and fall on the main conveyor belt conveyor. on the machine; the screening device includes a rotating shaft, a predetermined number of screen bars, and a first driver, the screen bars are fixed on the rotating shaft and evenly distributed along the axial direction of the rotating shaft, the screen bars are perpendicular to the rotating shaft, so that the screen bars are driven to rotate by the rotation of the rotating shaft, and there is a gap between every two screen bars, so that when the screen bars rotate, small pieces of coal pass through the gap between the two screen bars, and large pieces of coal are driven by the screen bars to the crushing device for crushing, the first driver is fixed on the inner wall of the supporting shell, and the driving end of the first driver is fixedly connected to the rotating shaft to provide power for the rotating shaft; the screening device also includes a predetermined number of adjusting tooth plates, the adjusting tooth plates are connected to the screen bars and the two are perpendicular, and the gap area surrounded by the adjusting tooth plates and the screen bars is used to screen large pieces of coal and small pieces of coal, so that small pieces of coal can pass through the gap area surrounded by the adjusting tooth plates and the screen bars; the inclination angle of the guide plate is 30°~60°.

2. The fixed screening and crushing device for underground coal mines according to claim 1, characterized in that: The predetermined number of screen bars are divided into a predetermined number of groups, and the screen bars in each group are evenly distributed along the radial direction of the rotating shaft.

3. The fixed screening and crushing device for underground coal mines according to claim 2, characterized in that: The crushing device includes a predetermined number of crushing rollers and a second driver. There is a gap between every two crushing rollers so that large pieces of coal can be crushed by the crushing rollers. The small pieces of coal produced after crushing pass through the gap between the two crushing rollers and fall onto the main conveyor belt conveyor. The driving end of the second driver is fixedly connected to the crushing roller to provide power for the crushing roller.

4. The fixed screening and crushing device for underground coal mines according to claim 3, characterized in that: The adjusting tooth plate is movably connected to the screen bar so that the adjusting tooth plate can move along the length direction of the screen bar, thereby changing the size of the gap area surrounded by the adjusting tooth plate and the screen bar, and further changing the size of the coal blocks that the screening device can screen.

5. The fixed screening and crushing device for underground coal mines according to claim 4, characterized in that: The screening device also includes a predetermined number of cleaning brushes, which are fixed inside the supporting shell and close to the screen bars. When the screen bars are driven to rotate by the rotating shaft, the cleaning brushes pass between two screen bars to clean the coal slag attached between the two screen bars.

6. The fixed screening and crushing device for underground coal mines according to any one of claims 1 to 5, characterized in that: The screen bars are arc-shaped and bent.

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