Dynamic separation method of gangue and large foreign matter in raw coal transportation

Abstract

The present invention discloses a dynamic sorting method for gangue and large foreign matter in raw coal transportation, which realizes the accurate sorting of large-particle gangue in raw coal without changing the normal transportation of raw coal underground; belongs to the technical field of separating solid from solid by screening method; under the premise of not affecting the original arrangement of the raw coal conveying belt underground, a large-particle gangue sorting mechanism that does not interfere with the raw coal conveying belt is provided, and a camera for identifying large-particle gangue and a dynamic spiral screen roller for large-particle gangue are respectively provided directly above the raw coal conveying belt; according to the recognition signal of the camera and the belt transmission speed, the dynamic spiral screen roller is controlled to intercept and move the large-particle gangue laterally out of the raw coal conveying belt, so that it falls into the gangue collection box, thereby realizing the separation of large-particle gangue from raw coal.

Description

Technical Field

[0001] The present invention relates to a coal gangue sorting method, in particular to a method for dynamically sorting coal gangue and large foreign matter in raw coal transported on a belt conveyor during underground raw coal transportation. Background Art

[0002] Gangue is a black-gray rock with a lower carbon content and harder than coal that accompanies the coal seam during the coalification process. It is a solid waste. In raw coal mining, gangue is mined together with the raw coal and transported to the ground by belt conveyors. At present, the separation of gangue and raw coal is mainly carried out on the ground above the mine. The sorting methods include manual sorting, water sorting, air sorting and gamma ray sorting. Manual sorting mainly involves workers observing with the naked eye and manually picking out large pieces of gangue mixed with the raw coal. Manual sorting has the defects of low sorting efficiency and high probability of misselection and omission. Water sorting and air sorting have the characteristics of large investment, large equipment footprint, and are not suitable for underground production environments. Water sorting is even more difficult in areas with scarce water resources. Difficult; Gamma ray gangue sorting uses gamma rays to identify coal and gangue, and generates different electrical signals according to the different attenuation of gamma rays in coal and gangue. The electrical signal feedback controls the actuator, and the actuator changes the trajectory of the gangue, thereby achieving the purpose of separating coal from gangue; Gamma ray gangue sorting has a complex system and low sorting capacity. At the same time, due to the presence of water and coal slime in the raw coal on site, the surface of the gangue is often covered, resulting in low accuracy of gamma ray identification of gangue; In addition, during the mining and transportation of raw coal, some anchor rods or large particles from other production processes are also mixed in the raw coal. How to effectively separate these large debris from the raw coal is also a problem that needs to be solved in production.

[0003] At present, for the underground raw coal transportation link, some underground coal gangue sorting equipment has been developed. These equipment mainly realizes the separation of gangue by setting a coal gangue sorting screen on the raw coal conveying belt channel; for example, the invention patent with patent number 200710022602.7, entitled "Mine coal gangue separation method and equipment", discloses a large gangue separation equipment suitable for underground operation. The technical solution is to set a gangue sorting machine in the underground raw coal conveying belt, first screen out the coal blocks and gangue with a particle size greater than 50 mm, and the large block materials screened out are sent to the mine. The coal enters the crushing separator, where the rotating impeller crushes these large-sized particles. The crushed coal with a particle size of less than 50 mm falls through the spiral screen plate onto the rear belt conveyor and is transported to the underground coal bunker. The gangue that is not broken in the crushing separator is thrown to the rear baffle under the action of the rotating force of the impeller in the separator, falls onto the gangue conveyor belt, and is transported to the gangue bunker, thereby realizing the sorting of gangue with a particle size greater than 50 mm. This technical solution mainly utilizes the different hardness characteristics of coal and gangue, and adds a sorting machine and a crusher to the raw coal conveyor belt. Crusher, large-sized gangue can be separated through two procedures. The first process completes the separation of large-sized materials (including coal blocks and gangue blocks); the second process crushes the selected large-sized materials, crushes the large-sized coal blocks, and throws out the large-sized gangue that cannot be crushed, thereby separating the large-sized gangue from the coal; this separation technology has the disadvantages of a long sorting process and high equipment investment cost. In particular, in the second process, the large-sized coal blocks and large-sized gangue are crushed together and separated by crushing, which results in serious energy waste and low gangue sorting accuracy. The cost is not high, the sorting equipment occupies a large area and the equipment investment is large. In addition, since the impeller spiral rotary crusher is set in the raw coal conveyor belt and is part of the conveyor belt, in the process of crushing large-particle materials, if it gets stuck, it needs to be shut down for maintenance, which will cause the entire raw coal conveyor belt to stop working, affecting the normal raw coal production order underground. In addition, the process of separating the coal gangue from the raw coal conveyor belt through mechanical actuators also has the defect of easily scratching the belt. How to protect the belt to the greatest extent in this process is also a problem that needs to be solved on site. Summary of the Invention

[0004] The present invention provides a dynamic sorting method for gangue and large foreign matter in raw coal transportation, which realizes the dynamic and accurate sorting of large-particle gangue and large foreign matter in the raw coal without changing the normal transportation of raw coal underground.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The overall concept of the present invention is as follows: without changing the original layout of the underground raw coal conveyor belt, a large-particle gangue sorting mechanism is set up that does not interfere with the raw coal conveyor belt. A camera for identifying large-particle gangue and a dynamic spiral screen roller for large-particle gangue are respectively set above the raw coal conveyor belt. According to the recognition signal of the camera and the belt transmission speed, the dynamic spiral screen roller is controlled to intercept the large-particle gangue and move it laterally out of the raw coal conveyor belt so that it falls into the gangue collection box, thereby realizing the separation of large-particle gangue from raw coal.

[0007] A dynamic sorting system for gangue and large foreign matter in raw coal transportation comprises a raw coal conveyor belt support, a raw coal conveyor belt is arranged on the raw coal conveyor belt support, raw coal is transported on the raw coal conveyor belt, and large-particle gangue is mixed in the raw coal, an identification camera installation gantry is arranged on the raw coal conveyor belt support, a gangue identification camera is arranged on the top crossbeam of the identification camera installation gantry, and a front support and a rear support for installing a sorting mechanism are arranged at intervals above the raw coal conveyor belt along the raw coal transportation direction, the raw coal transported by the raw coal conveyor belt first passes through the identification camera installation gantry, and then passes through the front support and the rear support in sequence, and a camera is arranged between the front support and the rear support. A spiral screen roller is provided, and the spiral screen roller is arranged directly above the raw coal conveyor belt, and the central axis of the spiral screen roller coincides with the conveying direction of the raw coal conveyor belt. On the outer surface of the spiral screen roller, spiral screen levers are spirally arranged at equal intervals of arc. A spiral screen roller drive mechanism mounting plate is provided between the side of the front bracket and the side of the rear bracket. A spiral screen roller rotation drive mechanism and an electric controller are respectively provided on the spiral screen roller drive mechanism mounting plate. The electric controller is respectively electrically connected to the spiral screen roller rotation drive mechanism and the coal gangue identification camera, and the spiral screen roller rotation drive mechanism is mechanically connected to the front end center axis of the spiral screen roller.

[0008] A front bearing is provided in the middle of the top crossbeam of the front bracket, a rear bearing is provided in the middle of the top crossbeam of the rear bracket, a front end central axis is provided on the front side elevation of the spiral screen roller, a rear end central axis is provided on the rear side elevation of the spiral screen roller, the front end central axis is provided in the front bearing, and the rear end central axis is provided in the rear bearing; the spiral screen roller is a hollow cylinder, and on the half-arc shaped outer surface of the spiral screen roller, along the direction of the central axis of the spiral screen roller, the tail of the spiral screen lever is provided at equal intervals in the spiral direction, passing through the pipe seat, and the other half arc of the spiral screen roller passing through the central axis of the pipe seat is provided at the tail. On the outer surface of the shape, there is a tail fixed pipe seat of the spiral screen rod, and the tail passes through the center hole of the pipe seat and is connected with the inner cavity of the spiral screen roller. The center hole of the tail fixed pipe seat is connected with the inner cavity of the spiral screen roller. On the tail rod body of the spiral screen rod, there are rod upper pin shaft connection holes at intervals, and a pipe seat upper pin shaft connection hole is provided on the tail fixed pipe seat. The tail of the spiral screen rod passes through the tail through the pipe seat and the hollow inner cavity of the spiral screen roller in turn, and is connected to the tail fixed pipe seat. A tail fixing pin of the spiral screen rod is provided between the pin shaft connection hole on the pipe seat and the corresponding pin shaft connection hole on the rod.

[0009] The spiral screen roller rotation drive mechanism refers to the hydraulic station, the first hydraulic cylinder and the second hydraulic cylinder. The hydraulic station is arranged on the spiral screen roller drive mechanism mounting plate. The first hydraulic cylinder and the second hydraulic cylinder are respectively connected to the hydraulic station, and the hydraulic station is electrically connected to the electronic controller; a drive disk is connected to the shaft end of the front center shaft, and a drive pin is arranged on the outer circle of the drive disk; a hydraulic cylinder mounting gantry is mounted on the top crossbeam of the front bracket, and the first hydraulic cylinder and the second hydraulic cylinder are respectively fixedly arranged on the hydraulic cylinder mounting gantry, and the first hydraulic cylinder and the second hydraulic cylinder are both tilted downwardly suspended on the hydraulic cylinder mounting gantry, and the end of the output shaft of the first hydraulic cylinder is hinged to the drive pin, and the end of the output shaft of the second hydraulic cylinder is hinged to the drive pin; the angle between the central axis of the first hydraulic cylinder and the central axis of the second hydraulic cylinder is 90 degrees.

[0010] On the raw coal conveyor belt bracket on one side of the raw coal conveyor belt below the spiral screen roller, there is a smoothing plate after the gangue is pushed out, and an inclined filter screen is provided on the outer side below the smoothing plate, and the lower end of the inclined filter screen is connected to a gangue collection box; below the inclined filter screen is provided a small coal block recovery inclined upload belt, and the upper end of the small coal block recovery inclined upload belt is connected with a chute, and the lower end of the chute is provided above the raw coal conveyor belt.

[0011] A method for dynamically sorting gangue and large foreign matter in raw coal transportation adopts a dynamic sorting system for sorting gangue and large foreign matter. The dynamic sorting system for gangue and large foreign matter includes a raw coal conveyor belt arranged on a raw coal conveyor belt support. Raw coal is transported on the raw coal conveyor belt, and large-particle gangue is mixed in the raw coal. An identification camera installation gantry is arranged on the raw coal conveyor belt support, and a gangue identification camera is arranged on the top crossbeam of the identification camera installation gantry. Above the raw coal conveyor belt, along the raw coal transportation direction, front and rear supports for installing sorting mechanisms are arranged at intervals. The raw coal transported by the raw coal conveyor belt first passes through the identification camera installation gantry, and then A spiral screen roller is arranged between the front bracket and the rear bracket in sequence, and the spiral screen roller is arranged directly above the raw coal conveyor belt, and the central axis of the spiral screen roller is parallel to the conveying direction of the raw coal conveyor belt. On the outer arc surface of the spiral screen roller, spiral screen levers are spirally arranged at equal intervals. A spiral screen roller drive mechanism mounting plate is arranged between the side of the front bracket and the side of the rear bracket. A spiral screen roller rotation drive mechanism and an electric controller are respectively arranged on the spiral screen roller drive mechanism mounting plate. The electric controller is electrically connected to the spiral screen roller rotation drive mechanism and the coal gangue identification camera respectively, and is characterized by the following steps:

[0012] When the gangue identification camera identifies large-sized gangue or large foreign objects in the raw coal being transported on the raw coal conveyor belt, it will transmit the signal of large-sized gangue or large foreign objects to the electronic controller. The electronic controller drives the spiral screen roller to rotate through the spiral screen roller rotation drive mechanism, intercepts the large-sized gangue being transported, and at the same time pushes it to the outside of the raw coal conveyor belt, so that the large-sized gangue or large foreign objects fall to the outside of the raw coal conveyor belt, thereby separating the large-sized gangue or large foreign objects from the raw coal being transported on the raw coal conveyor belt.

[0013] A front bearing is provided on the top crossbeam of the front bracket, a rear bearing is provided on the top crossbeam of the rear bracket, a front end center axis is provided on the front side elevation of the spiral screen roller, and a rear end center axis is provided on the rear side elevation of the spiral screen roller. The front end center axis of the spiral screen roller is provided in the front bearing, and the rear end center axis of the spiral screen roller is provided in the rear bearing. The spiral screen roller is movably supported between the front bearing and the rear bearing; the electric controller drives the spiral screen roller to rotate counterclockwise or clockwise through the spiral screen roller rotation drive mechanism.

[0014] The spiral screen roller is a hollow cylinder. On the half-arc-shaped outer surface of the spiral screen roller, along the central axis direction of the spiral screen roller, the tail of the spiral screen lever is spirally and evenly spaced at an arc. The tail fixed tube seat of the spiral screen lever is provided on the other half-arc-shaped outer surface of the spiral screen roller through which the tail passes through the central axis of the tube seat. On the tail rod body of the spiral screen lever, pin-shaft connecting holes on the lever are provided at intervals. On the tail fixed tube seat, a pin-shaft connecting hole on the tube seat is provided. The tail of the spiral screen lever passes through the hollow inner cavity of the tail through-tube seat and the spiral screen roller in sequence, and is connected to the tail fixed tube seat. A tail fixing pin of the spiral screen lever is provided between the pin-shaft connecting hole on the tube seat and the corresponding pin-shaft connecting hole on the lever.

[0015] When there is no large-sized gangue in the raw coal being transported on the raw coal conveyor belt, the arc-shaped outer side of the spiral screen roller where the head of the spiral screen lever is located is in an upward position, that is, the arc-shaped outer side and the raw coal conveyor belt are arranged opposite to each other, and the raw coal being transported on the raw coal conveyor belt passes directly under the spiral screen roller;

[0016] When the gangue identification camera detects large-particle gangue in the raw coal being transported on the raw coal conveyor belt, the gangue identification camera will transmit the electrical signal of the large-particle gangue to the electronic controller. The electronic controller calculates the time when the large-particle gangue reaches the front bracket and drives the spiral screen roller to rotate through the spiral screen roller rotation drive mechanism at this time. During the rotation process, the spiral screen rods spirally arranged on the spiral screen roller enter the raw coal being transported on the raw coal conveyor belt in turn, intercepting the large-particle gangue and pushing the large-particle gangue to the outside of the raw coal conveyor belt, so that the large-particle gangue is separated from the raw coal and falls to one side of the raw coal conveyor belt. When all the spiral screen rods leave the raw coal on the raw coal conveyor belt, the electronic controller controls the spiral screen roller to stop rotating through the spiral screen roller rotation drive mechanism. At this time, the arc-shaped outer side surface of the spiral screen rod on the side wall of the spiral screen roller where the head is located returns to the upward position.

[0017] The spiral screen roller rotation drive mechanism refers to a hydraulic station, a first hydraulic cylinder, and a second hydraulic cylinder. The hydraulic station is arranged on the mounting plate of the spiral screen roller drive mechanism. The first hydraulic cylinder and the second hydraulic cylinder are respectively connected to the hydraulic station, and the hydraulic station is electrically connected to the electronic controller. A drive disk is fixedly connected to the end of the front center shaft, and a drive pin is arranged on the outer circle of the drive disk. A hydraulic cylinder mounting gantry is mounted on the top crossbeam of the front bracket, and the first hydraulic cylinder and the second hydraulic cylinder are respectively fixed on the hydraulic cylinder mounting gantry. The end of the output shaft of the first hydraulic cylinder is hinged to the drive pin, and the end of the output shaft of the second hydraulic cylinder is hinged to the drive pin. The method for the spiral screen roller rotation drive mechanism to drive the spiral screen roller to rotate is as follows:

[0018] The electronic controller controls the output shaft of the first hydraulic cylinder to extend with pressure through the hydraulic station. The shaft end of the output shaft of the first hydraulic cylinder pushes the drive disc to rotate counterclockwise for the first 90 degrees through the hinged drive pin. During the process of the drive disc rotating for the first 90 degrees, the output shaft of the second hydraulic cylinder follows without pressure. Afterwards, the electronic controller controls the output shaft of the second hydraulic cylinder to extend with pressure through the hydraulic station. The shaft end of the output shaft of the second hydraulic cylinder pushes the drive disc to rotate counterclockwise for the second 90 degrees through the hinged drive pin. During the process of the drive disc rotating for the second 90 degrees, the output shaft of the first hydraulic cylinder follows without pressure. Afterwards, the electronic controller controls the output shaft of the second hydraulic cylinder to extend with pressure through the hydraulic station. The shaft end of the output shaft of the second hydraulic cylinder pushes the drive disc to rotate counterclockwise for the second 90 degrees through the hinged drive pin. During the process of the drive disc rotating for the second 90 degrees, the output shaft of the first hydraulic cylinder follows without pressure. The controller controls the output shaft of the first hydraulic cylinder to compress and return through the hydraulic station, pulling the drive disc to rotate counterclockwise for a third 90 degrees. During the third 90-degree rotation of the drive disc, the output shaft of the second hydraulic cylinder follows without pressure. Finally, the electronic controller controls the output shaft of the second hydraulic cylinder to compress and return through the hydraulic station, pulling the drive disc to rotate counterclockwise for a fourth 90 degrees. During the fourth 90-degree rotation of the drive disc, the output shaft of the first hydraulic cylinder follows without pressure. Through the above 360-degree rotation of the drive disc, the spiral screen roller is also driven to rotate 360 ​​degrees, thereby intercepting large-particle gangue and stripping it from the raw coal.

[0019] A material-smoothing plate for removing gangue is provided on the raw coal conveyor belt support on one side of the raw coal conveyor belt below the spiral screen roller. An inclined filter screen is provided on the outer side below the material-smoothing plate. A gangue collecting box is connected to the lower end of the inclined filter screen. A small coal lump recovery inclined upload belt is provided below the inclined filter screen. A chute is provided at the upper end of the small coal lump recovery inclined upload belt. The lower end of the chute is provided above the raw coal conveyor belt. The material removed by the spiral screen roller is transported in the following manner:

[0020] The material removed by the spiral screen roller first falls onto the inclined filter screen through the material sorting plate. The large-particle gangue intercepted by the inclined filter screen slides into the gangue collection box. The smaller materials removed leak from the screen gap of the inclined filter screen and fall onto the small coal block recovery inclined upload belt. The small coal block recovery inclined upload belt conveys the smaller materials upward to the chute, and returns to the raw coal conveyor belt through the chute.

[0021] The present invention utilizes the spirally arranged shifting rods on the spiral screen roller to accurately screen large-sized coal gangue and large foreign objects on the coal conveyor belt, and returns the mistakenly shifted raw coal blocks to the original conveyor belt. The entire sorting mechanism is independent of the raw coal conveying system and does not affect the normal operation of the original raw coal conveyor belt system. Only when large-sized coal gangue is found, the screening shifting rods are inserted into the raw coal being conveyed on the raw coal conveyor belt. During the entire screening process, the raw coal conveyor belt operates normally, reducing the interference of the sorting work on the conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 This is a structural diagram of the spiral screen roller 7 of the present invention intercepting large-particle gangue 10 and pushing it out of the raw coal conveyor belt 2;

[0024] Figure 3 It is a structural schematic diagram of the spiral screen roller 7 of the present invention;

[0025] Figure 4 yes Figure 3 A schematic structural diagram of the middle spiral screen roller 7 as viewed from the side;

[0026] Figure 5 This is a diagram showing the relationship between the two hydraulic cylinders and the drive plate 19 of the present invention;

[0027] Figure 6 It is a transverse cross-sectional view of the spiral screen roller 7 of the present invention;

[0028] The accompanying drawings are marked as follows: 1-raw coal conveyor belt bracket, 2-raw coal conveyor belt, 3-identification camera mounting gantry, 4-coal gangue identification camera, 5-front bracket, 6-rear bracket, 7-spiral screen roller, 8-spiral screen lever, 9-electric controller, 10-large particle size coal gangue, 11-front side bearing, 12-rear side bearing, 13-front end center axis, 14-rear end center axis, 15-tail through pipe seat, 16-tail fixed pipe seat, 17-pin shaft through hole on pipe seat, 18-pin shaft through hole on lever, 19-drive disk, 20-hydraulic cylinder mounting gantry, 21-first hydraulic cylinder, 22-second hydraulic cylinder, 23-drive pin shaft, 24-smoothing plate, 25-filter screen, 26-coal gangue collection box, 27-small coal block recovery inclined upload belt, 28-chute, 29-tail fixing pin. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings:

[0030] Generally, the particle size of coal gangue is between 25 and 100 mm, among which the output rate of the particle size class of 150-50 mm is 91.31%. Generally, coal gangue with a particle size greater than 50 mm is called large-particle-size coal gangue; a dynamic sorting system for coal gangue and large foreign matter in raw coal transportation, comprising a raw coal conveyor belt support 1, a raw coal conveyor belt 2 is arranged on the raw coal conveyor belt support 1, raw coal is conveyed on the raw coal conveyor belt 2, and large-particle-size coal gangue 10 is mixed in the raw coal. The raw coal mined on the working surface is generally transported to the coal bunker through the raw coal conveyor belt, an identification camera installation gantry 3 is arranged on the raw coal conveyor belt support 1, and coal gangue is arranged on the top crossbeam of the identification camera installation gantry 3. Gangue identification camera 4, the lens of coal gangue identification camera 4 is facing the raw coal conveyed by raw coal conveyor belt 2, when there is large-sized coal gangue 10 in the raw coal, coal gangue identification camera 4 will identify it and record the position where the coal gangue is photographed. Above the raw coal conveyor belt 2, along the raw coal conveying direction, front bracket 5 and rear bracket 6 for installing sorting mechanism are installed at intervals. The raw coal conveyed by raw coal conveyor belt 2 first passes through the gantry frame 3 installed by the identification camera, and then passes through the front bracket 5 and rear bracket 6 in turn. A spiral screen roller 7 is provided between the front bracket 5 and the rear bracket 6. The spiral screen roller 7 is arranged just above the raw coal conveyor belt 2, and the central axis of the spiral screen roller 7 coincides with the conveying direction of the raw coal conveyor belt 2. Taken together, that is to say, the present invention breaks the traditional habit of arranging the intercepting screen roller horizontally, and arranges the spiral screen roller 7 longitudinally. On the outer surface of the spiral screen roller 7, a spiral screen rod 8 is provided along the spiral direction. A group of spiral screen rods 8 arranged along the spiral line form a special-shaped rake; the spiral screen roller 7 is arranged longitudinally along the conveying direction of the raw coal conveyor belt 2, so that during its rotation, the spiral screen rods 8 provided along the spiral direction are inserted into the raw coal on the raw coal conveyor belt 2 in sequence, which plays the effect of intercepting large-particle-size coal gangue 10 in a dynamic buffering manner along the curve, greatly reducing the probability of a group of spiral screen rods 8 getting stuck when intercepting large-particle-size coal gangue 10, and pushing large-particle-size coal gangue 10 during rotation. The gangue 10 rotates on its own to achieve the purpose of smoothly pushing it out of the raw coal conveyor belt 2; a spiral screen roller drive mechanism mounting plate is provided between the side of the front bracket 5 and the side of the rear bracket 6, and a spiral screen roller rotation drive mechanism and an electric controller 9 are respectively provided on the spiral screen roller drive mechanism mounting plate. The electric controller 9 is electrically connected to the spiral screen roller rotation drive mechanism and the coal gangue identification camera 4 respectively, and the spiral screen roller rotation drive mechanism is mechanically connected to the front end center shaft 13 of the spiral screen roller 7. The electric controller 9 controls the action of the spiral screen roller rotation drive mechanism, and the spiral screen roller rotation drive mechanism drives the front end center shaft 13 to rotate, and the front end center shaft 13 then drives the entire spiral screen roller 7 to rotate.

[0031] A front bearing 11 is provided in the middle of the top crossbeam of the front bracket 5, and a rear bearing 12 is provided in the middle of the top crossbeam of the rear bracket 6. A front end center shaft 13 is provided on the front side elevation of the spiral screen roller 7, and a rear end center shaft 14 is provided on the rear side elevation of the spiral screen roller 7. The front end center shaft 13 is provided in the front bearing 11, and the rear end center shaft 14 is provided in the rear bearing 12; the spiral screen roller 7 is a hollow cylinder, and on the half-arc outer side of the spiral screen roller 7, along the central axis direction of the spiral screen roller 7, the tail of the spiral screen lever 8 is provided with a tube seat 15 at equal intervals in a spiral manner, and on the other half-arc outer side of the spiral screen roller 7 through which the central axis of the tail passes, a tail fixed tube seat 16 of the spiral screen lever 8 is provided, and on the tail rod body of the spiral screen lever 8, pin-connecting holes 18 are provided at intervals, and a pin-connecting hole 18 is provided on the tail fixed tube seat 16. The pin on the tube seat passes through the through hole 17, and the tail of the spiral screen lever 8 passes through the hollow inner cavity of the tail through the tube seat 15 and the spiral screen roller 7 in sequence, and then passes through the tail fixed tube seat 16. Between the pin on the tube seat and the corresponding pin on the lever, a tail fixing pin 29 of the spiral screen lever 8 is provided; each spiral screen lever 8 arranged along the spiral line forms a 180-degree arc-shaped lever rake, through which the arc lever The passage of the rake in the raw coal has the effect of raking out the large-particle gangue 10 in the raw coal; the outer end contour of the special-shaped arc-shaped shifting rod rake should be close to or consistent with the curvature of the raw coal conveyor belt 2, ensuring that the arc-shaped shifting rod rake will not damage the belt when rotating through the raw coal conveyor belt 2; the spiral screen shifting rod 8 and the spiral screen roller 7 are designed to be a plug-in combination, which is convenient for replacing the spiral screen shifting rod 8 and also convenient for adjusting the length of the shifting rod exposed outside the cylinder.

[0032] The spiral screen roller rotation drive mechanism refers to a hydraulic station, a first hydraulic cylinder 21 and a second hydraulic cylinder 22. The hydraulic station is arranged on the spiral screen roller drive mechanism mounting plate. The first hydraulic cylinder 21 and the second hydraulic cylinder 22 are respectively connected to the hydraulic station, and the hydraulic station is electrically connected to the electronic controller 9; a drive disk 19 is connected to the shaft end of the front center shaft 13, and a drive pin 23 is arranged on the outer circle of the disk surface of the drive disk 19; a hydraulic cylinder mounting gantry 20 is mounted on the top crossbeam of the front bracket 5, and the first hydraulic cylinder 21 and the second hydraulic cylinder 22 are respectively fixed on the hydraulic cylinder mounting gantry 20, and the end of the output shaft of the first hydraulic cylinder 21 is hinged to the drive pin 23, and the end of the output shaft of the second hydraulic cylinder 22 is hinged to the drive pin 23; the angle between the central axis of the first hydraulic cylinder 21 and the central axis of the second hydraulic cylinder 22 is 90 degrees; through the cooperation of the two hydraulic cylinders and the hydraulic station, the interception and separation force of large-particle-size coal gangue 10 is increased.

[0033] On the raw coal conveyor belt bracket 1 on one side of the raw coal conveyor belt 2 below the spiral screen roller 7, there is a smoothing plate 24 after the gangue is removed. The setting of the smoothing plate 24 is to protect the raw coal conveyor belt bracket 1. An inclined filter screen 25 is provided on the outer side below the smoothing plate 24, and a gangue collecting box 26 is provided at the lower end of the inclined filter screen 25; a small coal block recovery inclined upload belt 27 is provided below the inclined filter screen 25, and a chute 28 is provided at the upper end of the small coal block recovery inclined upload belt 27, and the lower end of the chute 28 is provided above the raw coal conveyor belt 2; the filter screen 25 and the small coal block recovery inclined upload belt 27 are provided to return the small coal blocks removed with the large-particle-size gangue 10 to the raw coal conveyor belt 2.

[0034] A method for dynamically sorting gangue and large foreign matter in raw coal transportation adopts a dynamic gangue sorting system for sorting. The dynamic gangue sorting system includes a raw coal conveyor belt 2 set on a raw coal conveyor belt support 1. Raw coal is transported on the raw coal conveyor belt 2, and large-particle gangue 10 is mixed in the raw coal. An identification camera installation gantry 3 is set on the raw coal conveyor belt support 1, and a gangue identification camera 4 is set on the top crossbeam of the identification camera installation gantry 3. Above the raw coal conveyor belt 2, along the raw coal conveying direction, a front bracket 5 and a rear bracket 6 for installing a sorting mechanism are set at intervals. The raw coal transported by the raw coal conveyor belt 2 first passes through the identification camera installation gantry 3, and then passes through the front bracket 5 and the rear bracket 6 in sequence. The bracket 5 and the rear bracket 6 are provided with a spiral screen roller 7 between the front bracket 5 and the rear bracket 6. The spiral screen roller 7 is provided just above the raw coal conveyor belt 2, and the central axis of the spiral screen roller 7 is parallel to the conveying direction of the raw coal conveyor belt 2. A spiral screen lever 8 is provided on the outer arc surface of the spiral screen roller 7 along the spiral direction. A spiral screen roller drive mechanism mounting plate is provided between the side of the front bracket 5 and the side of the rear bracket 6. A spiral screen roller rotation drive mechanism and an electric controller 9 are provided on the spiral screen roller drive mechanism mounting plate respectively. The electric controller 9 is electrically connected to the spiral screen roller rotation drive mechanism and the coal gangue identification camera 4 respectively, and is characterized by the following steps:

[0035] When the gangue identification camera 4 identifies large-particle gangue 10 in the raw coal being transported on the raw coal conveyor belt 2, the signal of the large-particle gangue 10 is transmitted to the electronic controller 9. The electronic controller 9 drives the spiral screen roller 7 to rotate through the spiral screen roller rotation drive mechanism, intercepts the large-particle gangue 10 being transported, and at the same time pulls it out to the outside of the raw coal conveyor belt 2, so that the large-particle gangue 10 falls to the outside of the raw coal conveyor belt 2, thereby separating the large-particle gangue 10 from the raw coal being transported on the raw coal conveyor belt 2.

[0036] A front bearing 11 is provided on the top crossbeam of the front bracket 5, a rear bearing 12 is provided on the top crossbeam of the rear bracket 6, a front end center axis 13 is provided on the front side elevation of the spiral screen roller 7, and a rear end center axis 14 is provided on the rear side elevation of the spiral screen roller 7. The front end center axis 13 of the spiral screen roller 7 is provided in the front bearing 11, and the rear end center axis 14 of the spiral screen roller 7 is provided in the rear side bearing 12, so that the spiral screen roller 7 is movably supported between the front bearing 11 and the rear side bearing 12; the electric controller 9 drives the spiral screen roller 7 to rotate counterclockwise or clockwise through the spiral screen roller rotation drive mechanism; when the spiral screen roller 7 is driven to rotate counterclockwise, the large-particle-size coal gangue 10 can be stripped to one side of the raw coal conveyor belt 2, and when the spiral screen roller 7 is driven to rotate clockwise, the large-particle-size coal gangue 10 can be stripped to the other side of the raw coal conveyor belt 2.

[0037] The spiral screen roller 7 is a hollow cylinder. On the half-arc outer surface of the spiral screen roller 7, along the central axis direction of the spiral screen roller 7, the tail of the spiral screen lever 8 is spirally and evenly spaced at an arc. The tail of the spiral screen roller 7 passes through the central axis of the tail through the lever 15. The tail fixed lever 16 of the spiral screen lever 8 is provided. On the tail rod body of the spiral screen lever 8, the lever pin through-hole 18 is provided at intervals. The tail fixed lever 16 is provided with a lever pin through-hole 17. , the combination of the spiral screen lever 8 and the cylinder of the spiral screen roller 7 is designed to be combined. When installing the spiral screen lever 8, the tail of the spiral screen lever 8 is passed through the hollow inner cavity of the tail through-tube seat 15 and the spiral screen roller 7 in sequence, and then connected to the tail fixed tube seat 16. A tail fixing pin 29 of the spiral screen lever 8 is provided between the pin shaft through-hole 17 on the tube seat and the corresponding pin shaft through-hole 18 on the lever; the protruding length of the spiral screen lever 8 can be adjusted by pinning different pin holes at the tail of the spiral screen lever 8 to adapt to belts of different widths and curvatures;

[0038] When there is no large-sized gangue 10 in the raw coal being transported on the raw coal conveyor belt 2, the curved outer side surface of the spiral screen roller 7 where the head of the spiral screen lever 8 is located is in an upward position, that is, the curved outer side surface is arranged opposite to the raw coal conveyor belt 2, and the raw coal being transported on the raw coal conveyor belt 2 passes directly under the spiral screen roller 7;

[0039] When the gangue identification camera 4 finds that there is large-sized gangue 10 in the raw coal being transported on the raw coal conveyor belt 2, the gangue identification camera 4 transmits the electrical signal of the large-sized gangue 10 to the electronic controller 9, and the electronic controller 9 calculates the time when the large-sized gangue 10 reaches the front bracket 5, and at this time, drives the spiral screen roller 7 to rotate through the spiral screen roller rotation drive mechanism. During the rotation process, the spiral screen rods 8 spirally arranged on the spiral screen roller 7 successively enter the raw coal being transported on the raw coal conveyor belt 2. The large-sized coal gangue 10 is intercepted and pushed to the outside of the raw coal conveyor belt 2 in the raw coal being delivered, so that the large-sized coal gangue 10 is separated from the raw coal and falls to one side of the raw coal conveyor belt 2. When all the spiral screen rods 8 leave the raw coal on the raw coal conveyor belt 2, the electronic controller 9 controls the spiral screen roller 7 to stop rotating through the spiral screen roller rotation drive mechanism. At this time, the arc-shaped outer side surface where the head of the spiral screen rod 8 on the side wall of the spiral screen roller 7 is located returns to the upward position.

[0040] The spiral screen roller rotation drive mechanism refers to the hydraulic station, the first hydraulic cylinder 21 and the second hydraulic cylinder 22. The hydraulic station is arranged on the spiral screen roller drive mechanism mounting plate. The first hydraulic cylinder 21 and the second hydraulic cylinder 22 are respectively connected to the hydraulic station, and the hydraulic station is electrically connected to the electronic controller 9. The end of the front center shaft 13 is fixedly connected to the drive disk 19, and a drive pin 23 is arranged on the outer circle of the drive disk 19. A hydraulic cylinder mounting gantry 20 is mounted on the top crossbeam of the front bracket 5, and the first hydraulic cylinder 21 and the second hydraulic cylinder 22 are respectively fixed on the hydraulic cylinder mounting gantry 20. The end of the output shaft of the first hydraulic cylinder 21 and the second hydraulic cylinder 22 are hinged together with the drive pin 23, and the end of the output shaft of the second hydraulic cylinder 22 is hinged together with the drive pin 23; the drive plate 19 is rotated in a 90-degree step-by-step manner. The electronic controller 9 controls the output shaft of the first hydraulic cylinder 21 to extend with pressure through the hydraulic station, pushing the drive plate 19 to rotate the first 90 degrees. During the process of the drive plate 19 rotating the first 90 degrees, the output shaft of the second hydraulic cylinder 22 follows without pressure; thereafter, the electronic controller 9 controls the second hydraulic cylinder 22 through the hydraulic station. The output shaft of the first hydraulic cylinder 21 is extended with pressure, pushing the driving plate 19 to rotate a second 90 degrees. During the process of the driving plate 19 rotating a second 90 degrees, the output shaft of the first hydraulic cylinder 21 follows without pressure. After that, the electronic controller 9 controls the output shaft of the first hydraulic cylinder 21 to be compressed back through the hydraulic station, pulling the driving plate 19 to rotate a third 90 degrees. During the process of the driving plate 19 rotating a third 90 degrees, the output shaft of the second hydraulic cylinder 22 follows without pressure. Finally, the electronic controller 9 controls the output shaft of the second hydraulic cylinder 22 to be compressed back through the hydraulic station, pulling the driving plate 19 to rotate a third Four 90 degrees, during the fourth 90-degree rotation of the drive disc 19, the output shaft of the first hydraulic cylinder 21 is followed without pressure; through the 360-degree rotation of the drive disc 19, the spiral screen roller 7 is driven to rotate 360 ​​degrees, realizing the whole process of intercepting the large-particle gangue 10 and stripping it from the raw coal; the reason why the 360-degree rotation of the spiral screen roller 7 is completed by four 90-arc step-by-step pushes is mainly based on strengthening the interception force and pushing and stripping force of the shifting rod on the large-particle gangue 10 in transportation, so that the driving force of the hydraulic station can be fully exerted.

[0041] A material-smoothing plate 24 is provided on the raw coal conveyor belt support 1 on one side of the raw coal conveyor belt 2 below the spiral screen roller 7, after the gangue is removed. An inclined filter screen 25 is provided on the outer side below the material-smoothing plate 24, and a gangue collecting box 26 is provided at the lower end of the inclined filter screen 25. A small coal lump recovery inclined upload belt 27 is provided below the inclined filter screen 25, and a chute 28 is provided at the upper end of the small coal lump recovery inclined upload belt 27. The lower end of the chute 28 is provided above the raw coal conveyor belt 2. The material removed by the spiral screen roller 7 is transported in the following manner:

[0042] The material selected by the spiral screen roller 7 first falls onto the inclined filter screen 25 through the material sorting plate 24, and the large-particle gangue 10 intercepted by the inclined filter screen 25 slides into the gangue collecting box 26. The selected smaller materials leak from the screen gap of the inclined filter screen 25 and fall onto the small coal block recovery inclined upload belt 27. The small coal block recovery inclined upload belt 27 conveys the smaller materials upward to the chute 28, and the smaller materials return to the raw coal conveyor belt 2 through the chute 28; thereby overcoming the loss of coal blocks caused by the gangue sorting.

[0043] The distance between adjacent spiral screen bars 8 can be dynamically adjusted according to the particle size of the large-size coal gangue 10 on site, and the distance between adjacent spiral screen bars 8 can be increased by installing the spiral screen bars 8 at intervals.

Claims

1. A method for dynamically sorting gangue and large foreign matter during raw coal transportation, wherein the gangue is sorted by a dynamic coal sorting system. The dynamic coal sorting system comprises a raw coal conveyor belt (2) arranged on a raw coal conveyor belt support (1), raw coal is transported on the raw coal conveyor belt (2), and large-sized gangue (10) is mixed in the raw coal, an identification camera mounting gantry (3) is arranged on the raw coal conveyor belt support (1), a gangue identification camera (4) is arranged on the top crossbeam of the identification camera mounting gantry (3), and a front bracket (5) and a rear bracket (6) for mounting a sorting mechanism are arranged above the raw coal conveyor belt (2) along the raw coal transportation direction at intervals. The raw coal transported by the raw coal conveyor belt (2) first passes through the identification camera mounting gantry (3) and then passes through the front bracket in sequence. (5) and the rear support (6), a spiral screen roller (7) is provided between the front support (5) and the rear support (6), the spiral screen roller (7) is provided just above the raw coal conveyor belt (2), and the central axis of the spiral screen roller (7) is parallel to the conveying direction of the raw coal conveyor belt (2), spiral screen levers (8) are provided on the outer arc surface of the spiral screen roller (7) at equal intervals of arc, a spiral screen roller drive mechanism mounting plate is provided between the side of the front support (5) and the side of the rear support (6), a spiral screen roller rotation drive mechanism and an electric controller (9) are provided on the spiral screen roller drive mechanism mounting plate, respectively, the electric controller (9) is electrically connected to the spiral screen roller rotation drive mechanism and the coal gangue identification camera (4), respectively, and is characterized by the following steps: When the gangue identification camera (4) identifies that there is large-sized gangue (10) in the raw coal being transported on the raw coal conveyor belt (2), the signal of the large-sized gangue (10) is transmitted to the electronic controller (9), and the electronic controller (9) drives the spiral screen roller (7) to rotate through the spiral screen roller rotation drive mechanism, so that the spiral screen rods (8) arranged at equal intervals of arc on the spiral screen roller pass through the raw coal being transported on the raw coal conveyor belt (2), intercept the large-sized gangue (10) transported, and at the same time, push the large-sized gangue (10) to the outside of the raw coal conveyor belt (2), so that the large-sized gangue (10) falls to the outside of the raw coal conveyor belt (2), thereby realizing the separation of the large-sized gangue (10) from the raw coal being transported on the raw coal conveyor belt (2).

2. The method for dynamically separating gangue and large foreign matter in raw coal transportation according to claim 1, characterized in that: A front bearing (11) is provided on the top crossbeam of the front bracket (5), a rear bearing (12) is provided on the top crossbeam of the rear bracket (6), a front end central shaft (13) is provided on the front side elevation of the spiral screen roller (7), and a rear end central shaft (14) is provided on the rear side elevation of the spiral screen roller (7). The front end central shaft (13) of the spiral screen roller (7) is provided in the front bearing (11), and the rear end central shaft (14) of the spiral screen roller (7) is provided in the rear end bearing (12); the electric controller (9) drives the front end central shaft (13) provided on the front side elevation of the spiral screen roller (7) to rotate counterclockwise through the spiral screen roller rotation drive mechanism, and the front end central shaft (13) drives the spiral screen roller (7) to rotate counterclockwise with the front end bearing (11) and the rear end bearing (12) as support.

3. The method for dynamically separating gangue and large foreign matter during raw coal transportation according to claim 1, characterized in that: The spiral screen roller (7) is a hollow cylinder. On the half-arc outer surface of the spiral screen roller (7), along the central axis direction of the spiral screen roller (7), the tail of the spiral screen lever (8) passes through the pipe seat (15) at equal intervals in the spiral direction. On the other half-arc outer surface of the spiral screen roller (7) through which the central axis of the tail passes through the pipe seat (15), the tail fixing pipe seat (16) of the spiral screen lever (8) is provided. On the tail rod body of the spiral screen lever (8), the tail fixing pipe seat (16) of the spiral screen lever (8) is provided. A pin-connecting hole (18) on the shift rod is provided, a pin-connecting hole (17) on the tube seat is provided on the tail fixed tube seat (16), the tail of the spiral screen shift rod (8) passes through the hollow inner cavity of the tail through tube seat (15) and the spiral screen roller (7) in sequence, and then is connected to the tail fixed tube seat (16), and a tail fixing pin (29) of the spiral screen shift rod (8) is provided between the pin-connecting hole (17) on the tube seat and the corresponding pin-connecting hole (18) on the shift rod; When there is no large-sized gangue (10) in the raw coal being transported on the raw coal conveyor belt (2), the arc-shaped outer side surface of the spiral screen roller (7) where the head of the spiral screen lever (8) is located is in an upward position, that is, the arc-shaped outer side surface and the raw coal conveyor belt (2) are arranged opposite each other. At this time, the raw coal being transported on the raw coal conveyor belt (2) passes directly below the spiral screen roller (7); When the gangue identification camera (4) detects that there is large-sized gangue (10) in the raw coal being transported on the raw coal conveyor belt (2), the gangue identification camera (4) transmits the electric signal of the detection of the large-sized gangue (10) to the electric controller (9), and the electric controller (9) calculates the time when the large-sized gangue (10) reaches the front bracket (5), and at this time, drives the spiral screen roller (7) to rotate through the spiral screen roller rotation drive mechanism. During the rotation process, the spiral screen levers (8) arranged at equal intervals on the spiral screen roller (7) enter the raw coal conveyor belt in sequence. (2) intercepts the large-sized coal gangue (10) from the raw coal being conveyed and pushes the large-sized coal gangue (10) to the outside of the raw coal conveyor belt (2), separates the large-sized coal gangue (10) from the raw coal, and makes it fall to one side of the raw coal conveyor belt (2). After all the spiral screen levers (8) leave the raw coal on the raw coal conveyor belt (2), the electric controller (9) controls the spiral screen roller (7) to stop rotating through the spiral screen roller rotation drive mechanism. At this time, the arc-shaped outer side surface of the spiral screen roller (7) where the head of the spiral screen lever (8) is located returns to the upward position.

4. The method for dynamically separating gangue and large foreign matter during raw coal transportation according to claim 2, characterized in that: The spiral screen roller rotation drive mechanism refers to a hydraulic station, a first hydraulic cylinder (21) and a second hydraulic cylinder (22). The hydraulic station is arranged on a mounting plate of the spiral screen roller drive mechanism. The first hydraulic cylinder (21) and the second hydraulic cylinder (22) are respectively connected to the hydraulic station. The hydraulic station is electrically connected to the electric controller (9). The end of the front center shaft (13) is fixedly connected to the drive disk (19). A drive pin (23) is arranged on the outer circle of the disk surface of the drive disk (19). A hydraulic cylinder mounting gantry (20) is mounted on the top crossbeam of the front bracket (5). The first hydraulic cylinder (21) and the second hydraulic cylinder (22) are respectively fixedly arranged on the hydraulic cylinder mounting gantry (20). The end of the output shaft of the first hydraulic cylinder (21) is hinged to the drive pin (23). The end of the output shaft of the second hydraulic cylinder (22) is hinged to the drive pin (23). The method for the spiral screen roller rotation drive mechanism to drive the spiral screen roller (7) to rotate is as follows: The electric controller (9) controls the output shaft of the first hydraulic cylinder (21) to extend with pressure through the hydraulic station. The shaft end of the output shaft of the first hydraulic cylinder (21) pushes the drive disc (19) to rotate counterclockwise for the first 90 degrees through the hinged drive pin (23). During the process of the drive disc (19) rotating for the first 90 degrees, the output shaft of the second hydraulic cylinder (22) follows without pressure. Afterwards, the electric controller (9) controls the output shaft of the second hydraulic cylinder (22) to extend with pressure through the hydraulic station. The shaft end of the output shaft of the second hydraulic cylinder (22) pushes the drive disc (19) to rotate counterclockwise for the second 90 degrees through the hinged drive pin (23). During the process of the drive disc (19) rotating for the second 90 degrees, the output shaft of the first hydraulic cylinder (21) follows without pressure. Afterwards, , the electronic controller (9) controls the output shaft of the first hydraulic cylinder (21) to be compressed and returned through the hydraulic station, pulling the drive disc (19) to rotate counterclockwise for a third of 90 degrees. During the process of the drive disc (19) rotating for the third of 90 degrees, the output shaft of the second hydraulic cylinder (22) follows without pressure. Finally, the electronic controller (9) controls the output shaft of the second hydraulic cylinder (22) to be compressed and returned through the hydraulic station, pulling the drive disc (19) to rotate counterclockwise for a fourth of 90 degrees. During the process of the drive disc (19) rotating for the fourth of 90 degrees, the output shaft of the first hydraulic cylinder (21) follows without pressure. Through the above 360-degree rotation of the drive disc (19), the spiral screen roller (7) is also rotated 360 degrees, thereby achieving the interception of large-particle-size coal gangue (10) and the stripping thereof from the raw coal.

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