Screening, transporting and crushing system for underground belt conveyor

Abstract

A screening, transfer and crushing system for an underground belt transport section comprises a belt conveyor, a screening transfer machine, a screening crusher and a scraper transfer machine, wherein the input end of the screening transfer machine is arranged on one side of the output end of the belt conveyor, the output end of the screening transfer machine is arranged on the upper end of the screening crusher, a scraper transfer machine is arranged at the lower end of the screening crusher, the input end of the scraper transfer machine is arranged below the input end of the screening transfer machine, and the bottom of the scraper transfer machine is arranged horizontally; the present invention can realize the screening and crushing of raw coal mixture underground, and then transport small pieces of raw coal to the outside of the well, which greatly reduces the situation of over-crushing of raw coal mixture and solves the problem of over-crushing of raw coal, and the screening crusher only crushes large pieces of raw coal, which greatly reduces the workload of the screening crusher and reduces the operation and maintenance cost of the screening crusher, and the scraper transfer machine only transports small pieces of raw coal, with high transportation efficiency and significantly reduced wear rate, further reducing system cost.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining and conveying devices, and in particular to a screening, transporting and crushing system for an underground belt conveyor section. Background Art

[0002] The crushing and transfer system is one of the indispensable links in the underground transportation system of coal mines. Its main function is to crush the raw coal in large pieces, long strips, flakes, etc. that may easily cause blockage in the transportation system of the coal washing plant before entering the coal washing plant.

[0003] In the traditional coal mine transportation system, the raw coal crushing and transportation system is generally arranged on the mine ground or at the coal bunker unloading port. Regardless of the particle size, it needs to pass through the crusher, which causes a part of the raw coal to be over-crushed. In addition, due to the large amount of coal, the crushing capacity, reliability, wear resistance, etc. of the crusher are required to be high. The daily maintenance of the equipment is large, which indirectly increases the system cost. Summary of the invention

[0004] In view of this, in order to address the above-mentioned shortcomings, it is necessary to propose a screening, transporting and crushing system for underground belt transport sections.

[0005] A screening, transfer and crushing system for an underground belt transport section comprises a belt conveyor, a screening transfer machine, a screening crusher and a scraper transfer machine, wherein the input end of the screening transfer machine is arranged on one side of the output end of the belt conveyor, the output end of the screening transfer machine is arranged on the upper end of the screening crusher, a scraper transfer machine is arranged at the lower end of the screening crusher, the input end of the scraper transfer machine is arranged below the input end of the screening transfer machine, and the bottom of the scraper transfer machine is arranged horizontally; the screening transfer machine comprises a first tail, a first middle trough, a first transition trough, a first A scraper chain, a first machine head, a first power unit, the first machine tail is arranged at the lower end of the output end of the belt conveyor, one end of the first middle trough is arranged on the first machine tail, and the other end of the first middle trough is arranged on the first transition trough, and the first transition trough is also arranged on the first machine head, so that the first middle trough and the first transition trough are arranged to form an upward inclined screening and transfer channel for screening the raw coal mixture output by the belt conveyor, and the screened large pieces of raw coal are transmitted to the first machine head along the screening and transfer channel, and the screened small pieces of raw coal directly fall into the lower On the scraper transfer machine, the first scraper chain is arranged inside the first middle trough, a screening crusher is arranged at the lower end of the first head, and a first power unit is also arranged on the first head; the screening crusher includes a double-toothed roller crusher and a third power unit, the double-toothed roller crusher is arranged at the lower end of the first head, and is used to crush the large pieces of raw coal transported by the first head, so that the large pieces of raw coal are broken into small pieces of raw coal, and the third power unit is arranged on one side of the double-toothed roller crusher; the scraper transfer machine includes a second tail, a second power unit, a second transition trough, a second middle trough, an automatic telescopic head, and a second scraper chain, the second tail is arranged at the lower end of the first tail, the second power unit is arranged on one side of the second tail and on both sides of the automatic telescopic head, the input end of the second transition trough is arranged on the second tail, the output end of the second transition trough is arranged with the input end of the second middle trough, so that the second transition trough and the second middle trough are arranged to form a gradually horizontal transfer channel for conveying small pieces of raw coal, the output end of the second middle trough is provided with an automatic telescopic head, and the second scraper chain is arranged inside the second middle trough.

[0006] Preferably, the first middle trough includes a first middle plate and a first bottom plate, the first middle plate is arranged at the upper end of the first bottom plate, the first middle plate includes a left plate and a right plate, the left plate and the right plate have the same horizontal height, and the opposite sides of the left plate and the right plate do not touch, so that the raw coal mixture falling from the output end of the belt conveyor above the first middle plate passes through the first middle plate and falls on the first bottom plate, the first middle plate supports the upper chain path of the first scraper chain to run, the first bottom plate supports the lower chain path of the first scraper chain to run, and the running direction of the upper chain path is opposite to the running direction of the lower chain path, so as to realize the circulating motion of the first scraper chain, and a plurality of screening holes are arranged on the working surface of the first bottom plate, so that small pieces of raw coal in the raw coal mixture pass through the screening holes and fall onto the scraper transfer machine, the screening holes are arranged along the length direction of the first bottom plate, and the apertures of the plurality of screening holes gradually increase along the movement direction of the lower chain path of the first scraper chain.

[0007] Preferably, the screening transfer machine is also provided with a receiving hopper, the inlet end of the receiving hopper is connected to the output end of the belt conveyor, the outlet end of the receiving hopper is arranged at the upper end of the first middle groove near the first tail of the machine, and the outlet end of the receiving hopper is inclined. The screening transfer machine is also provided with a first baffle, the bottom end of the first baffle is arranged at the upper end of the first middle groove, and the top end of the first baffle is arranged around the inlet end of the receiving hopper. The screening transfer machine is also provided with a sliding hopper, the inlet end of the sliding hopper is arranged at the lower end of the screening hole, and the outlet end of the sliding hopper is arranged at the upper end of the second middle groove.

[0008] Preferably, the second middle trough includes a second middle plate and a second bottom plate, the second middle plate is arranged at the upper end of the second bottom plate, the second middle plate supports the upper chain path of the second scraper chain, the second bottom plate supports the lower chain path of the second scraper chain, and the running direction of the upper chain path is opposite to the running direction of the lower chain path, so as to realize the circulating motion of the second scraper chain, the second middle plate is a closed plate body, which is used to carry small pieces of raw coal scattered from the first bottom plate and the screening crusher, and transport the small pieces of raw coal to the automatic telescopic head through the second scraper chain.

[0009] Preferably, the second middle plate adopts a double-layer structure, and the double-layer structure includes a replacement layer and a fixed layer, and the replacement layer and the fixed layer are connected by countersunk bolts.

[0010] Preferably, the scraper transfer machine is also provided with a second baffle, and the second baffle is arranged on the second middle groove.

[0011] Preferably, two double-toothed roller crushers are provided, and a crushing beam is provided at the lower end between the double-toothed roller crushers.

[0012] Preferably, the scraper transfer machine is also provided with a micro-spray device, and the micro-spray device is arranged on the second baffle plate near the outlet end of the sliding hopper.

[0013] The present invention realizes the separation of the raw coal mixture through the screening transfer machine, so that the small pieces of raw coal are directly scattered on the scraper transfer machine below, and the large pieces of raw coal are transported to the screening crusher. The screening crusher fully crushes the large pieces of raw coal into small pieces of raw coal. The crushed small pieces of raw coal are directly scattered on the scraper transfer machine, which greatly reduces the operation cost of the screening crusher. The scraper transfer machine then transports the small pieces of raw coal to the automatic telescopic head, and then transports them outside the well. Compared with the prior art, the screening and crushing of the raw coal mixture can be realized underground, and the small pieces of raw coal are then transported outside the well. The small pieces of raw coal have good consistency, which greatly reduces the situation of over-crushing of the raw coal mixture, solves the problem of over-crushing of raw coal, and the screening crusher only crushes large pieces of raw coal, which greatly reduces the workload of the screening crusher, reduces the operation and maintenance costs of the screening crusher, and the scraper transfer machine only transports small pieces of raw coal, with high transportation efficiency and significantly reduced wear rate, further reducing the system cost.

[0014] The raw coal mixture has been screened, crushed and transported out of the well, and can be directly used as a semi-finished product or a finished product. The prior art requires that the raw coal mixture be transported out of the well first, and then screened, crushed, transported and other operations are performed before it can be used as a semi-finished product or a finished product. Compared with the prior art, the present invention greatly improves the screening and transportation efficiency of the raw coal mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the front view of the screening, transporting and crushing system used in the underground belt transport section.

[0016] Figure 2 This is a top view structural diagram of the screening, transporting and crushing system used in the underground belt transport section.

[0017] Figure 3 It is a structural diagram of the AA section.

[0018] Figure 4 A partial enlarged schematic diagram of the screening holes.

[0019] Figure 5 This is a schematic diagram of the structure of the first middle slot in the original design.

[0020] Figure 6 This is a cross-sectional view of the first middle groove along the AA direction in the original design.

[0021] In the figure: belt conveyor 10, screening transfer machine 20, first tail 21, first middle trough 22, first middle plate 221, left plate 2211, right plate 2212, first bottom plate 222, screening hole 2221, first transition trough 23, first scraper chain 24, first head 25, first power unit 26, receiving hopper 27, first baffle 28, sliding hopper 29, screening crusher 30, double-toothed roller crusher 31, crushing beam 32, third power unit 33, scraper transfer machine 40, second tail 41, second power unit 42, second transition trough 43, second middle trough 44, second middle plate 441, second bottom plate 442, automatic telescopic head 45, second scraper chain 46, second baffle 47, micro-spray device 48. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figures 1 to 4The present invention provides a screening, transporting and crushing system for an underground belt transport section, comprising a belt conveyor 10, a screening transfer machine 20, a screening crusher 30 and a scraper transfer machine 40. The input end of the screening transfer machine 20 is arranged on one side of the output end of the belt conveyor 10, and the output end of the screening transfer machine 20 is arranged on the upper end of the screening crusher 30, for conveying large pieces of raw coal to the screening crusher 30. The lower end of the screening crusher 30 is provided with a scraper transfer machine 40, and the input end of the scraper transfer machine 40 is arranged below the input end of the screening transfer machine 20. The bottom of the scraper transfer machine 40 is arranged horizontally, and the overall installation position is fixed, and it is connected to the foundation by anchor bolts; The sorting and transferring machine 20 includes a first tail 21, a first middle trough 22, a first transition trough 23, a first scraper chain 24, a first head 25, and a first power unit 26. The first tail 21 is arranged at the lower end of the output end of the belt conveyor 10, and its height is lower than that of the first head 25, so that the screening and transferring channel between the first tail 21 and the first head 25 becomes an inclined channel. One end of the first middle trough 22 is arranged on the first tail 21, and the other end of the first middle trough 22 is arranged on the first transition trough 23. The first transition trough 23 is also arranged on the first head 25. The working surface of the first transition trough 23 is arranged in an arc surface. Through the first transition trough 23, the first middle trough 22, the first head 25 smoothly transitions, so that the first middle trough 22, the first transition trough 23, and the first head 25 are arranged to form an inclined upward screening transfer channel, which is used to screen the raw coal mixture output by the belt conveyor 10. When the raw coal mixture passes through the screening transfer channel, it is simultaneously subjected to its own gravity and the thrust of the first scraper chain 24. Small pieces of raw coal are continuously scattered from the screening holes 2221 directly to the scraper transfer machine 40 below under the action of their own gravity. Large pieces of raw coal are transported to the first head 25 along the screening transfer channel under the thrust of the first scraper chain 24. The first scraper chain 24 is arranged inside the first middle trough 22. A screening crusher is arranged at the lower end of the first head 25. 30, so as to transport the large pieces of raw coal to the inside of the screening crusher 30, the first head 25 is also provided with a first power unit 26, which is used to provide power to the first head 25; the screening crusher 30 includes a double-toothed roller crusher 31 and a third power unit 33, the double-toothed roller crusher 31 is arranged at the lower end of the first head 25, the screening crusher 30 adopts a three-stage crushing double-toothed roller crusher 31 with staggered teeth and adjustable roller center distance structure, which is used to fully crush the large pieces of raw coal in the form of flakes or strips transported by the first head 25, so that the large pieces of raw coal are crushed into small pieces of raw coal, and the third power unit 33 is arranged on one side of the double-toothed roller crusher 31, which is used to provide power to the double-toothed roller crusher 31;The scraper transfer machine 40 includes a second tail 41, a second power unit 42, a second transition groove 43, a second middle groove 44, an automatic telescopic head 45, and a second scraper chain 46. The second tail 41 is arranged at the lower end of the first tail 21, the second power unit 42 is arranged on one side of the second tail 41 and on both sides of the automatic telescopic head 45, and is used to provide power to the second tail 41. The input end of the second transition groove 43 is arranged on the second tail 41, and the output end of the second transition groove 43 is arranged to be connected to the input end of the second middle groove 44. The working surface of the second transition groove 43 is set in an arc surface, and the second middle groove 44 and the second tail 41 are smoothly transitioned through the second transition groove 43, so that the second tail 41, the second transition groove 43, and the second middle groove 44 are set to form a gradually horizontal transfer channel for conveying small pieces of raw coal. The output end of the second middle groove 44 is provided with an automatic telescopic head 45, and the second scraper chain 46 is arranged inside the second middle groove 44. The small pieces of raw coal are conveyed to the automatic telescopic head 45 under the thrust of the second scraper chain 46. ;

[0024] See also Figure 3 , Figure 4 Further, the first middle trough 22 includes a first middle plate 221 and a first bottom plate 222. The first middle plate 221 is arranged at the upper end of the first bottom plate 222. The first middle plate 221 includes a left plate 2211 and a right plate 2212. The left plate 2211 and the right plate 2212 have the same horizontal height, and the opposite sides of the left plate 2211 and the right plate 2212 do not contact each other, so that the raw coal mixture falling from the output end of the belt conveyor 10 above the first middle plate 221 passes through the first middle plate 221 and falls on the first bottom plate 222. The first middle plate 221 supports the first The upper chain track of the scraper chain 24 runs, and the first bottom plate 222 supports the lower chain track of the first scraper chain 24 to run, and the running direction of the upper chain track is opposite to the running direction of the lower chain track, so as to realize the circular motion of the first scraper chain 24. A plurality of screening holes 2221 are arranged on the working surface of the first bottom plate 222, so that small pieces of raw coal in the raw coal mixture can pass through the screening holes 2221 and fall onto the scraper transfer machine 40. The screening holes 2221 are arranged along the length direction of the first bottom plate 222, and the apertures of the plurality of screening holes 2221 gradually increase along the moving direction of the lower chain track of the first scraper chain 24.

[0025] See also Figure 5 , Figure 6 The original design uses an upper chain conveyor to transport materials, that is, the raw coal mixture to be screened is transported on the first middle plate 221, wherein small pieces of raw coal fall from the screening holes on the first middle plate 221, and the first bottom plate 222 of the original design is open, that is, the first bottom plate 222 in the original design is hollow. When small pieces of raw coal fall from the screening holes on the first middle plate 221, they are hit by the scraper running on the first bottom plate 222 and sheared and crushed, resulting in secondary crushing, which increases the particle size destruction rate.

[0026] See also Figure 3 Specifically, the traditional design of transporting materials by the upper chain conveyor is changed to transport by the lower chain conveyor. The first middle plate 221 of the first middle trough 22 is open, and the raw coal mixture falls directly from above the first middle trough 22 to the first bottom plate 222 of the first middle trough 22, and is transported by the lower chain conveyor, so as to avoid the raw coal mixture being sheared and crushed by the scraper when falling from the upper chain conveyor after screening, thereby effectively reducing the degree of over-crushing of the raw coal mixture.

[0027] See also Figure 1 Furthermore, the screening transfer machine 20 is also provided with a receiving hopper 27, the inlet end of the receiving hopper 27 is connected to the output end of the belt conveyor 10, and is used to receive the raw coal mixture transmitted by the belt conveyor 10, and the outlet end of the receiving hopper 27 is arranged at the upper end of the first middle groove 22 near the first tail 21, and the outlet end of the receiving hopper 27 is inclined to transmit the raw coal mixture to the first middle groove 22. The screening transfer machine 20 is also provided with a first baffle 28, the first The bottom end of the baffle 28 is arranged at the upper end of the first middle groove 22, and the top end of the first baffle 28 is arranged around the inlet end of the receiving hopper 27, which is used to prevent the raw coal mixture from splashing to the outside of the first middle groove 22 to ensure the smooth operation of the underground working channel. The screening transfer machine 20 is also provided with a sliding hopper 29, and the inlet end of the sliding hopper 29 is arranged at the lower end of the screening hole 2221, and the outlet end of the sliding hopper 29 is arranged at the upper end of the second middle groove 44, which is used to transport small pieces of raw coal to the scraper transfer machine 40.

[0028] A plurality of brackets are also provided at the lower end of the screening transfer channel of the screening transfer machine 20 for fixing the first middle trough 22 and the first transition trough 23 so that the first middle trough 22 and the first transition trough 23 can operate stably.

[0029] See also Figure 3 Further, the second middle groove 44 includes a second middle plate 441 and a second bottom plate 442. The second middle plate 441 is arranged at the upper end of the second bottom plate 442. The second middle plate 441 supports the upper chain path of the second scraper chain 46. The second bottom plate 442 supports the lower chain path of the second scraper chain 46. The upper chain path runs in the opposite direction to the lower chain path, forming a circular closed second scraper chain 46 to realize the circulating motion of the second scraper chain 46. The second middle plate 441 is a closed plate body, which is used to carry the small pieces of raw coal scattered from the first bottom plate 222 and the screening crusher 30, and transport the small pieces of raw coal to the automatic telescopic head 45 through the second scraper chain 46. The second bottom plate 442 is a semi-open plate body.

[0030] Furthermore, the second middle plate 441 adopts a double-layer structure, which includes a replacement layer and a fixed layer. The second middle plate 441 is an easily worn layer. By setting the second middle plate 441 as a replacement layer and a fixed layer, the replacement time can be greatly shortened. Only the worn replacement layer needs to be replaced, which greatly reduces the maintenance cost of the second middle plate 441. The replacement layer and the fixed layer are connected by countersunk bolts, which are easy to disassemble and assemble.

[0031] See also Figure 1 Furthermore, the scraper transfer machine 40 is also provided with a second baffle 47, which is arranged on the second middle groove 44 to prevent small pieces of raw coal transported by the sliding hopper 29 from splashing to the outside of the second middle groove 44, so as to ensure the smooth operation of the underground working channel; it can also increase the coal transportation capacity of the scraper transfer machine 40.

[0032] See also Figure 1 Furthermore, two double-toothed roller crushers 31 are provided to crush large pieces of raw coal horizontally and vertically, and a crushing beam 32 is provided at the lower end between the double-toothed roller crushers 31. The crushing beam 32 squeezes the raw coal after horizontal and vertical crushing to achieve three-stage crushing. The staggered teeth and roller center of the screening crusher 30 are adjustable, and the large pieces of raw coal can be crushed into small pieces of raw coal of different sizes according to needs.

[0033] See also Figure 1 Furthermore, the scraper transfer machine 40 is also provided with a micro-spray device 48, which is arranged on the second baffle 47 near the outlet end of the sliding hopper 29, and is used to spray water mist on the small pieces of raw coal scattered at a high position on the first bottom plate 222, so as to reduce the raw coal dust, which is beneficial to ensure the safety inside the mine.

[0034] Specific implementation steps:

[0035] 1) The screening, transporting and crushing system for the underground belt transport section is powered on;

[0036] 2) The belt conveyor 10 transports the raw coal mixture, and transports the raw coal mixture to the first middle trough 22 through the receiving hopper 27;

[0037] 3) The first bottom plate 222 of the first middle trough 22 screens the raw coal mixture, and the small pieces of raw coal are directly scattered onto the scraper transfer machine 40 below through the sliding hopper 29, and the large pieces of raw coal are transported to the first head 25 under the action of the first scraper chain 24, and the first head 25 transports the large pieces of raw coal to the screening crusher 30;

[0038] 4) The screening crusher 30 performs three-stage crushing on the large pieces of raw coal, so that the large pieces of raw coal are broken into small pieces of raw coal, and the small pieces of raw coal are scattered onto the scraper transfer machine 40;

[0039] 5) The scraper loader 40 carries the small pieces of raw coal scattered by the first bottom plate 222 and the screening crusher 30. The small pieces of raw coal are transported to the automatic telescopic machine head 45 under the action of the second scraper chain 46, and then transported to the outside of the well.

[0040] The modules or units in the device of the embodiment of the present invention may be combined, divided or deleted according to actual needs.

[0041] 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 screening, transporting and crushing system for underground belt transport section, characterized by: It includes a belt conveyor, a screening transfer machine, a screening crusher, and a scraper transfer machine. The input end of the screening transfer machine is arranged on one side of the output end of the belt conveyor, the output end of the screening transfer machine is arranged on the upper end of the screening crusher, and the lower end of the screening crusher is provided with a scraper transfer machine. The input end of the scraper transfer machine is arranged below the input end of the screening transfer machine, and the bottom of the scraper transfer machine is arranged horizontally; the screening transfer machine includes a first tail, a first middle trough, a first transition trough, a first scraper chain, a first head, and a first power unit. The first tail is arranged at the lower end of the output end of the belt conveyor, one end of the first middle trough is arranged on the first tail, the other end of the first middle trough is arranged on the first transition trough, and the first transition trough is also arranged at On the first machine head, the first middle trough and the first transition trough are arranged to form an upwardly inclined screening transfer channel, which is used to screen the raw coal mixture output by the belt conveyor. The screened large pieces of raw coal are transmitted to the first machine head along the screening transfer channel, and the screened small pieces of raw coal directly fall into the scraper transfer machine below. The first scraper chain is arranged inside the first middle trough. A screening crusher is arranged at the lower end of the first machine head, and a first power unit is also arranged on the first machine head; the screening crusher includes a double-toothed roller crusher and a third power unit. The double-toothed roller crusher is arranged at the lower end of the first machine head, and is used to crush the large pieces of raw coal transported by the first machine head into small pieces of raw coal. The third power unit is arranged on one side of the double-toothed roller crusher; The scraper transfer machine includes a second tail, a second power unit, a second transition trough, a second middle trough, an automatically telescopic head, and a second scraper chain. The second tail is arranged at the lower end of the first tail, the second power unit is arranged on one side of the second tail and on both sides of the automatically telescopic head, the input end of the second transition trough is arranged on the second tail, the output end of the second transition trough is arranged with the input end of the second middle trough, so that the second transition trough and the second middle trough are arranged to form a gradually horizontal transfer channel for conveying small pieces of raw coal, the output end of the second middle trough is provided with an automatically telescopic head, and the second scraper chain is arranged inside the second middle trough; the first middle trough includes a first middle plate and a first bottom plate, the first middle plate is arranged just above the first bottom plate, and the first middle The plate includes a left plate and a right plate, the left plate and the right plate have the same horizontal height, and the opposite sides of the left plate and the right plate do not touch, so that the raw coal mixture falling from the output end of the belt conveyor above the first middle plate passes through the first middle plate and falls on the first bottom plate, the first middle plate supports the upper chain path of the first scraper chain to run, the first bottom plate supports the lower chain path of the first scraper chain to run, and the running direction of the upper chain path is opposite to the running direction of the lower chain path, so as to realize the circular motion of the first scraper chain, a plurality of screening holes are arranged on the working surface of the first bottom plate, so that small pieces of raw coal in the raw coal mixture pass through the screening holes and fall onto the scraper transfer machine, the screening holes are arranged along the length direction of the first bottom plate, and the apertures of the plurality of screening holes gradually increase along the moving direction of the lower chain path of the first scraper chain;The scraper transfer machine is also provided with a micro-spray device, which is arranged on the second baffle plate near the outlet end of the sliding hopper. ; 2. The screening, transporting and crushing system for underground belt transport section according to claim 1, characterized in that: The screening transfer machine is also provided with a receiving hopper, the inlet end of the receiving hopper is connected to the output end of the belt conveyor, the outlet end of the receiving hopper is arranged at the upper end of the first middle groove near the first tail of the machine, and the outlet end of the receiving hopper is inclined. The screening transfer machine is also provided with a first baffle, the bottom end of the first baffle is arranged at the upper end of the first middle groove, and the top end of the first baffle is arranged around the inlet end of the receiving hopper. The screening transfer machine is also provided with a sliding hopper, the inlet end of the sliding hopper is arranged at the lower end of the screening hole, and the outlet end of the sliding hopper is arranged at the upper end of the second middle groove.

3. The screening, transporting and crushing system for underground belt transport section according to claim 1 is characterized in that: The second middle trough includes a second middle plate and a second bottom plate. The second middle plate is arranged at the upper end of the second bottom plate. The second middle plate supports the upper chain path of the second scraper chain. The second bottom plate supports the lower chain path of the second scraper chain. The running direction of the upper chain path is opposite to that of the lower chain path, so as to realize the circulating motion of the second scraper chain. The second middle plate is a closed plate body, which is used to carry small pieces of raw coal scattered from the first bottom plate and the screening crusher, and transport the small pieces of raw coal to the automatic telescopic head through the second scraper chain.

4. The screening, transporting and crushing system for underground belt transport section according to claim 3 is characterized in that: The second middle plate adopts a double-layer structure, and the double-layer structure includes a replacement layer and a fixed layer, and the replacement layer and the fixed layer are connected by countersunk bolts.

5. The screening, transporting and crushing system for underground belt transport section according to claim 1 is characterized in that: The scraper transfer machine is also provided with a second baffle, and the second baffle is arranged on the second middle groove.

6. The screening, transporting and crushing system for underground belt transport section according to claim 1, characterized in that: Two double-toothed roller crushers are provided, and a crushing beam is provided at the lower end between the double-toothed roller crushers.

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