CN113798184A

CN113798184A - Intelligent vibrating screen for coal washing with pre-diagnosis fault and alarm functions

Info

Publication number: CN113798184A
Application number: CN202110918835.5A
Authority: CN
Inventors: 冯家良; 支永东; 李居鹏; 王鲲; 喻刚
Original assignee: Huating Coal Group Co Ltd
Current assignee: Huating Coal Group Co Ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2021-12-17

Abstract

The invention discloses an intelligent vibrating screen for coal washing with functions of pre-diagnosis of faults and alarming, which comprises a bottom plate: the top of bottom plate is provided with first sieve case, the screen cloth is installed to the inner chamber of first sieve case, the bottom of first sieve case is provided with the support plate, the four corners of first sieve bottom of the case portion all is provided with the jacking subassembly, the bottom of support plate is provided with eccentric shake subassembly. According to the coal screening device, the jacking assembly and the screen are matched for use, coal entering an inner cavity of the primary screen box is screened for the first time, then the eccentric shaking assembly is moved to the position right below the support plate through the arrangement of the displacement assembly, then secondary screening is carried out on the coal under the matching use of the eccentric shaking assembly and the elastic assembly, the early warning assembly monitors the rotating speed of the conveying roller in real time during screening, and early warning is timely sent out when the conveying roller breaks down, so that the purposes of selecting screening specifications, facilitating control, achieving high processing automation degree and achieving fault early warning can be achieved.

Description

Intelligent vibrating screen for coal washing with pre-diagnosis fault and alarm functions

Technical Field

The invention belongs to the technical field of intelligent coal washing, and particularly relates to an intelligent vibrating screen for coal washing, which is used for pre-diagnosing faults and alarming.

Background

Coal washing is an indispensable procedure for coal deep processing, coal directly mined from a mine is called raw coal, a plurality of impurities are mixed in the raw coal in the mining process, the coal quality is different, coal with small internal ash content and coal with large internal ash content are mixed together, and the coal washing is an industrial process for removing the impurities in the raw coal or classifying high-quality coal and low-quality coal.

The in-process of current coal washing shale shaker using, the screening specification is comparatively single, the user is carrying out the screening of different specifications to the coal charge, need change shale shaker or screening position, lead to the unable quick change screening specification of user or increased the transport distance of coal charge, and current shale shaker mostly does not possess the malfunction alerting function, when breaking down, can not in time stop the operation to a plurality of equipment in the manufacturing procedure, make the coal charge appear accumulational phenomenon on the way of processing, cause mechanical equipment's damage even.

Disclosure of Invention

The invention aims to provide an intelligent vibrating screen for coal washing, which is provided with functions of pre-diagnosing faults and alarming, and aims to solve the technical problems that the screening specification of the existing vibrating screen for coal washing is single, a user needs to change the vibrating screen or the screening position when screening coal with different specifications is carried out, the user cannot rapidly change the screening specification or increase the conveying distance of the coal, most of the existing vibrating screens do not have the fault alarming function, and when a fault occurs, the operation of a plurality of devices in a processing procedure cannot be stopped in time, so that the coal is accumulated in the processing process, and even mechanical devices are damaged.

The technical scheme for solving the technical problems is as follows: intelligent shale shaker for coal washing with diagnose trouble in advance and report to police includes the bottom plate: the top of bottom plate is provided with first sieve case, the screen cloth is installed to the inner chamber of first sieve case, the bottom of first sieve case is provided with the support plate, the four corners of first sieve bottom of the case portion all is provided with the jacking subassembly, the bottom of support plate is provided with eccentric shake subassembly, eccentric shake subassembly is including being located the inferior sieve case under the support plate, the four corners of inferior sieve bottom of the case portion all is provided with elastic component, the top of bottom plate is provided with the displacement subassembly, the left front end of bottom plate is provided with the early warning subassembly, the bottom intercommunication of first sieve case has the workbin, the rectangle opening with workbin looks adaptation is seted up at the top of support plate, rotatable conveying roller is all installed to the front side and the rear side of bottom plate inner chamber, the surface cover of conveying roller is equipped with the conveyer belt.

Preferably, the jacking subassembly is including installing in support plate top both sides and slidable drive post, the equal fixedly connected with oval dish of front side and rear side on drive post surface, the four corners of first sieve bottom of the case portion has all welded the butt joint board, butt joint board and oval dish rolling contact.

Preferably, the four corners of first sieve bottom of the case portion all have welded spacing post, the bottom of spacing post run through to the bottom of support plate and with support plate sliding connection, the surface cover of spacing post is equipped with spring one, the top and the bottom of spring one weld with support plate and spacing post respectively.

Preferably, the bottom welding of secondary sieve case has the mounting bracket, driving motor one is installed to the inner chamber of mounting bracket, the fixed surface of a driving motor output shaft is connected with eccentric flail piece.

Preferably, elastic component is including the fixing base of welding in secondary screen bottom of the case portion four corners, the bottom of fixing base is run through and is provided with rather than gliding support column mutually, the skin weld of support column has the fixed plate, the surface cover of support column is equipped with spring two, the top and the bottom of spring two weld with fixing base and fixed plate respectively.

Preferably, the displacement subassembly is including installing the step motor at bottom plate top rear side, the direction balladeur train is all welded to the both sides at bottom plate top, the inner chamber of direction balladeur train is provided with rotatable threaded rod, the bottom welding of support column has the screw thread slider, screw thread slider threaded connection is on the surface of threaded rod, the inner wall welding of bearing and direction balladeur train is passed through to the front end of threaded rod, the rear end of threaded rod and the equal fixedly connected with belt pulley two of step motor's output shaft, three belt pulley two-pass belt drive connection.

Preferably, a second driving motor is installed on the rear side of the top of the carrier plate, a second belt pulley is fixedly connected to an output shaft of the second driving motor and the rear end of the driving column, and the two three belt pulleys are in transmission connection through the second belt pulley.

Preferably, the early warning subassembly is including installing the audible-visual annunciator at bottom plate left side front end, rotational speed detector is installed on audible-visual annunciator's right side, and the left end welding that is located the front side conveying roller has the commentaries on classics board, the rotational speed sensor who corresponds with the commentaries on classics board is all installed to the left top of commentaries on classics board and bottom.

Preferably, the bottom of the carrier plate is communicated with a wedge-shaped material guide plate, and the wedge-shaped material guide plate is positioned right above the secondary screen box.

Preferably, the surface of the elliptic disc is provided with an annular groove matched with the butt joint plate, the inner cavity of the butt joint plate is provided with a plurality of rotatable rollers, and the rollers are in rolling contact with the elliptic disc.

1. The invention has the beneficial effects that: in the invention, the coal entering the inner cavity of the primary screen box is screened for the first time through the matching use of the jacking component and the screen, then the eccentric shaking component is moved to the position under the support plate through the arrangement of the displacement component, then the coal is screened for the second time under the matching use of the eccentric shaking component and the elastic component, the early warning component monitors the rotating speed of the conveying roller in real time during screening, and sends out early warning in time when the conveying roller breaks down, thus achieving the purposes of convenient control of selecting screening specification, high processing automation degree and fault early warning, solving the problems that the screening specification is single in the using process of the existing coal washing vibrating screen, and the user needs to change the vibrating screen or the screening position when screening the coal with different specifications, so that the user can not change the screening specification or increase the conveying distance of the coal rapidly, most of the existing vibrating screens do not have a fault alarm function, and when a fault occurs, a plurality of devices in a processing procedure cannot be stopped in time, so that the phenomenon of accumulation of coal materials in the process of processing occurs, and even mechanical equipment is damaged.

2. According to the invention, through the arrangement of the jacking assembly, the driving column and the elliptical disc are used in a matched manner, the effect of upward reciprocating jacking on the butt-joint plate is achieved, and meanwhile, under the matched use of the limiting column and the spring I, the first screen box is shaken up and down on the top of the support plate, and then the coal in the inner cavity of the first screen box is screened, so that the coal with the pore diameter larger than that of the screen mesh slides out from two sides of the inner cavity of the first screen box, and the bottom of the inner cavity of the first screen box of the coal with the pore diameter smaller than that of the screen mesh slides into the inner cavity of the blanking box.

3. According to the invention, through the arrangement of the eccentric shaking component, the secondary screen box is arranged, so that the coal screened by the primary screen box and the screen can be screened secondarily, and meanwhile, under the matching use of the first driving motor and the eccentric throwing block, the secondary screen box is subjected to high-frequency shaking, and the screening efficiency of the secondary screen box is accelerated.

4. According to the secondary screen box, the elastic assembly is arranged, the supporting columns and the second springs are matched for use, on one hand, the secondary screen box is limited and guided, so that the secondary screen box can only shake up and down, on the other hand, the elasticity of the second springs accelerates the shaking frequency of the secondary screen box, and the screening efficiency is improved.

5. According to the invention, through the arrangement of the displacement assembly, the stepping motor and the belt pulley II are matched for use, the two threaded rods are driven simultaneously, so that the threaded slide block positioned in the inner cavity of the guide sliding frame can drive the supporting column to displace under the threaded drive of the threaded rods, and then whether the secondary screening box reaches the position right below the support plate or not is determined, and secondary screening is carried out.

6. According to the invention, through the arrangement of the early warning component, the rotation speed detector and the rotation speed sensor are matched for use, the rotation speed of the conveying roller can be measured, and meanwhile, when the rotation speed of the conveying roller is lower than a set value or the conveying roller stops rotating, the audible and visual alarm can give out early warning, so that the situation that materials are accumulated due to continuous blanking above the conveying belt is avoided.

Drawings

The above and/or other advantages of the invention will become more apparent and more readily appreciated from the following detailed description taken in conjunction with the accompanying drawings, which are given by way of illustration only and not by way of limitation, and in which:

FIG. 1 is a schematic perspective view of one embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of point A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a primary screen box and a blanking box according to one embodiment of the present invention;

FIG. 4 is a partial enlarged view of point B in FIG. 3 according to an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a carrier plate and a jacking assembly according to an embodiment of the present invention;

FIG. 6 is a perspective view of an eccentric dithering assembly and a spring assembly in accordance with an embodiment of the present invention;

FIG. 7 is a perspective view of an eccentric dithering assembly in accordance with an embodiment of the present invention;

FIG. 8 is a perspective view of a displacement assembly according to one embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the device comprises a bottom plate, 2, a primary screen box, 3, a carrier plate, 4, a jacking assembly, 41, a driving column, 42, an oval disc, 43, a butt joint plate, 44, a limiting column, 45, a first spring, 5, an eccentric shaking assembly, 51, a secondary screen box, 52, a mounting frame, 53, a first driving motor, 54, an eccentric throwing block, 6, an elastic assembly, 61, a fixing seat, 62, a supporting column, 63, a fixing plate, 64, a second spring, 7, a displacement assembly, 71, a stepping motor, 72, a guide carriage, 73, a threaded rod, 74, a threaded slider, 75, a second belt disc, 8, an early warning assembly, 81, an audible and visual alarm, 82, a rotating speed detector, 83, a rotating plate, 84, a rotating speed sensor, 9, a screen mesh, 10, a blanking box, 11, a conveying belt, 12, a conveying roller, 13, a rectangular opening, 14, a wedge-shaped guide plate, 15, a second driving motor, 16, a second belt disc, 17 and a roller.

Detailed Description

Hereinafter, an embodiment of the present invention having an intelligent coal washing vibrating screen with pre-diagnosis of malfunction and alarm will be described with reference to the accompanying drawings.

The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.

The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.

Example one

Fig. 1 to 8 show an intelligent coal washing vibrating screen with pre-diagnosis of faults and alarm according to an embodiment of the invention, which comprises a bottom plate 1: the top of bottom plate 1 is provided with first sieve case 2, screen cloth 9 is installed to the inner chamber of first sieve case 2, the bottom of first sieve case 2 is provided with support plate 3, the four corners of first sieve case 2 bottom all is provided with jacking subassembly 4, the bottom of support plate 3 is provided with eccentric shake subassembly 5, eccentric shake subassembly 5 is including being located the inferior sieve case 51 under support plate 3, the four corners of inferior sieve case 51 bottom all is provided with elastic component 6, the top of bottom plate 1 is provided with displacement subassembly 7, the left front end of bottom plate 1 is provided with early warning subassembly 8, the bottom intercommunication of first sieve case 2 has workbin 10, the rectangle opening 13 with workbin 10 looks adaptation is seted up at the top of support plate 3, rotatable conveying roller 12 is all installed to the front side and the rear side of bottom plate 1 inner chamber, the surface cover of conveying roller 12 is equipped with conveyer belt 11.

As a preferable embodiment of the present embodiment: jacking subassembly 4 is including installing in support plate 3 top both sides and slidable drive column 41, the equal fixedly connected with oval dish 42 in front side and the rear side on drive column 41 surface, and the four corners of first sieve case 2 bottom all welds and has butt plate 43, and butt plate 43 and oval dish 42 rolling contact.

As a preferable embodiment of the present embodiment: spacing post 44 has all been welded at the four corners of first sieve case 2 bottom, the bottom of spacing post 44 run through to the bottom of support plate 3 and with support plate 3 sliding connection, the surface cover of spacing post 44 is equipped with spring 45, the top and the bottom of spring 45 weld with support plate 3 and spacing post 44 respectively, through the setting of jacking subassembly 4, wherein the cooperation of drive post 41 and oval dish 42 is used, play the effect of reciprocal jacking upwards to butt joint board 43, obtain the cooperation at spacing post 44 and spring 45 simultaneously and use down, make first sieve case 2 shake from top to bottom at support plate 3, then screen the coal charge that is located first sieve case 2 inner chamber, make the coal charge that is greater than screen cloth 9 aperture from the both sides roll-off of first sieve case 2 inner chamber, and the bottom landing of the coal charge that is less than screen cloth 9 aperture first sieve case 2 inner chamber to the inner chamber of feed box 10.

As a preferable embodiment of the present embodiment: the bottom welding of inferior sieve case 51 has mounting bracket 52, driving motor 53 is installed to the inner chamber of mounting bracket 52, the surperficial fixedly connected with of driving motor 53 output shaft gets rid of piece 54 eccentrically, setting through eccentric shaking subassembly 5, wherein the setting of inferior sieve case 51, can carry out the secondary to the coal charge after primary sieve case 2 and the screen cloth 9 screening, simultaneously under driving motor 53 and eccentric cooperation of getting rid of piece 54 use, make inferior sieve case 51 self take place the high frequency shake, accelerate inferior sieve case 51's screening efficiency.

As a preferable embodiment of the present embodiment: elastic component 6 is including welding the fixing base 61 in inferior sieve case 51 bottom four corners, the bottom of fixing base 61 is run through and is provided with rather than gliding support column 62 mutually, the skin weld of support column 62 has fixed plate 63, the surface cover of support column 62 is equipped with two 64 springs, the top and the bottom of two 64 springs weld with fixing base 61 and fixed plate 63 respectively, setting through elastic component 6, wherein support column 62 and two 64 spring's cooperation are used, the effect of spacing direction has been played to inferior sieve case 51 on the one hand, make inferior sieve case 51 shake about only can taking place, the elasticity of two 64 springs on the other hand has accelerated the shake frequency of inferior sieve case 51, the screening efficiency is improved.

Example two

As a preferable embodiment of the present embodiment: the displacement assembly 7 comprises a stepping motor 71 installed on the rear side of the top of the bottom plate 1, guide carriages 72 are welded on two sides of the top of the bottom plate 1, a rotatable threaded rod 73 is arranged in an inner cavity of each guide carriage 72, a threaded slider 74 is welded at the bottom of each support column 62, the threaded slider 74 is in threaded connection with the surface of the threaded rod 73, the front end of each threaded rod 73 is welded with the inner wall of each guide carriage 72 through a bearing, the rear end of each threaded rod 73 and an output shaft of each stepping motor 71 are fixedly connected with a second belt pulley 75, the three second belt pulleys 75 are in transmission connection through a belt, and through the arrangement of the displacement assembly 7, the stepping motors 71 and the second belt pulleys 75 are matched for use, two threaded rods 73 are driven simultaneously, so that the threaded sliders 74 in the inner cavities of the guide carriages 72 can drive the support columns 62 to displace under the threaded drive of the threaded rods 73, then, it is determined whether the secondary screening box 51 reaches the position right below the carrier plate 3, and secondary screening is performed.

As a preferable embodiment of the present embodiment: the rear side of the top of the carrier plate 3 is provided with a second driving motor 15, an output shaft of the second driving motor 15 and the rear end of the driving column 41 are fixedly connected with a second belt pulley 16, and the three second belt pulleys 16 are in transmission connection through the second belt pulley.

As a preferable embodiment of the present embodiment: early warning subassembly 8 is including installing audible-visual annunciator 81 at bottom plate 1 left side front end, rotational speed detector 82 is installed on audible-visual annunciator 81's right side, the left end welding that is located front side conveying roller 12 has commentaries on classics board 83, the rotational speed sensor 84 that corresponds with commentaries on classics board 83 is all installed to the left top of commentaries on classics board 83 and bottom, setting through early warning subassembly 8, wherein rotational speed detector 82 and rotational speed sensor 84's cooperation is used, can survey the rotational speed of conveying roller 12, and simultaneously, be less than the setting value at the conveying roller 12 rotational speed, or when conveying roller 12 stall, audible-visual annunciator 81 can send the early warning, avoid the 11 tops of conveyer belt to last the unloading, cause piling up of material.

As a preferable embodiment of the present embodiment: the bottom of the carrier plate 3 is communicated with a wedge-shaped material guide plate 14, and the wedge-shaped material guide plate 14 is positioned right above the secondary screen box 51.

As a preferable embodiment of the present embodiment: the surface of oval dish 42 is seted up the annular groove with butt plate 43 looks adaptation, and a plurality of rotatable gyro wheels 17 are installed to the inner chamber of butt plate 43, and gyro wheel 17 and oval dish 42 rolling contact.

The working principle is as follows: when the coal screening device is used, a user drives the second driving motor 15 to rotate by matching the second driving motor 15 with the second belt pulley 16 and the driving column 41, so that the second belt pulley 42 lifts the butt-joint plate 43 in a reciprocating manner, and meanwhile, the first screening box 2 can reset in time under the action of the self gravity of the first screening box 2 and the first spring 45, so that the first screening box 2 shakes to input coal into the inner cavity of the first screening box 2, the shaking first screening box 2 screens the coal for the first time, so that the coal larger than the aperture of the screen 9 slides out from two sides of the inner cavity of the first screening box 2, and the bottom of the inner cavity of the first screening box 2 of the coal smaller than the aperture of the screen 9 slides into the inner cavity of the blanking box 10;

before the primary screen box 2 is used for screening, whether the position of the secondary screen box 51 is moved or not can be determined according to the screening specification of coal, a user can open the stepping motor 71, the threaded slider 74 drives the supporting column 62 to displace under the driving of the stepping motor 71 and the matching use of the threaded rod 73 and the guide sliding frame 72, and then the supporting column 62 and the fixed seat 61 drive the secondary screen box 51 to reach the position under the wedge-shaped material guide plate 14;

after the secondary screen box 51 is displaced to the position right below the wedge-shaped material guide plate 14, the first driving motor 53 is started, the first driving motor 53 drives the eccentric throwing block 54 to rotate, the mounting frame 52 and the first driving motor 53 shake at high frequency under the influence of the shape of the eccentric throwing block 54, and then the secondary screen box 51 shakes to perform secondary screening on coal falling from the wedge-shaped material guide plate 14;

after screening, the coal falls on the surface of the conveying belt 11, the conveying belt 11 and the conveying roller 12 convey the screened coal out from the top of the bottom plate 1, the conveying roller 12 rotates and drives the rotating plate 83 and the rotating speed sensor 84 to rotate, so that the rotating speed sensor 84 repeatedly approaches and separates from the rotating speed detector 82, the rotating speed of the conveying roller 12 is monitored in real time, and after the rotating speed of the conveying roller 12 is lower than a set value or stops rotating, the audible and visual alarm 81 gives out audible and visual early warning, a user should stop the screening process in time, and material accumulation caused by continuous blanking is avoided;

through the operation of the steps, the purposes of selecting screening specifications, facilitating control, high processing automation degree and fault early warning can be achieved.

In summary, the following steps: the intelligent vibrating screen for coal washing with pre-diagnosis fault and alarm functions is characterized in that coal entering an inner cavity of a primary screen box 2 is firstly screened by the aid of the jacking assembly 4 and the screen 9 in a matched mode, then the eccentric shaking assembly 5 is moved to the position under a support plate 3 through the arrangement of the displacement assembly 7, then the coal is secondarily screened by the aid of the eccentric shaking assembly 5 and the elastic assembly 6 in a matched mode, the rotating speed of a conveying roller 12 is monitored in real time by the early warning assembly 8 during screening, early warning is timely given out when the conveying roller 12 breaks down, the purposes of selecting screening specifications, facilitating control, high processing automation degree and early warning of faults can be achieved, the problems that screening specifications are single in the using process of the existing vibrating screen for coal washing, and a user needs to change the vibrating screen or screening positions when screening different specifications of the coal are achieved, the vibrating screen has the advantages that screening specifications can not be changed quickly or conveying distances of coal materials are increased by a user, most of the existing vibrating screens do not have a fault alarm function, and when a fault occurs, operation of multiple devices in a machining procedure cannot be stopped timely, so that the coal materials are accumulated in the machining process, and even mechanical equipment is damaged.

The technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.

Claims

1. Intelligent shale shaker for coal washing with advance diagnosis trouble and warning, its characterized in that includes bottom plate (1): the top of the bottom plate (1) is provided with a primary screen box (2), a screen (9) is installed in an inner cavity of the primary screen box (2), a support plate (3) is arranged at the bottom of the primary screen box (2), jacking assemblies (4) are arranged at four corners of the bottom of the primary screen box (2), an eccentric shaking assembly (5) is arranged at the bottom of the support plate (3), the eccentric shaking assembly (5) comprises a secondary screen box (51) positioned right below the support plate (3), elastic assemblies (6) are arranged at four corners of the bottom of the secondary screen box (51), a displacement assembly (7) is arranged at the top of the bottom plate (1), an early warning assembly (8) is arranged at the left front end of the bottom plate (1), the bottom of the primary screen box (2) is communicated with a blanking box (10), a rectangular opening (13) matched with the blanking box (10) is formed at the top of the support plate (3), rotatable conveying rollers (12) are installed on the front side and the rear side of the inner cavity of the bottom plate (1), and conveying belts (11) are sleeved on the surfaces of the conveying rollers (12).

2. The intelligent coal washing vibrating screen with pre-diagnosis fault and alarm functions according to claim 1, wherein the jacking assembly (4) comprises driving columns (41) which are installed on two sides of the top of the support plate (3) and can slide, oval discs (42) are fixedly connected to the front side and the rear side of the surface of each driving column (41), butt-joint plates (43) are welded to four corners of the bottom of the primary screen box (2), and the butt-joint plates (43) are in rolling contact with the oval discs (42).

3. The intelligent coal washing vibrating screen with pre-diagnosis fault and alarm functions as claimed in claim 2, wherein limiting columns (44) are welded to four corners of the bottom of the primary screen box (2), the bottom ends of the limiting columns (44) penetrate through the bottom of the support plate (3) and are in sliding connection with the support plate (3), springs (45) are sleeved on the surfaces of the limiting columns (44), and the top ends and the bottom ends of the springs (45) are respectively welded to the support plate (3) and the limiting columns (44).

4. The intelligent coal washing vibrating screen with pre-diagnosis fault and alarm functions as claimed in claim 3, wherein a mounting frame (52) is welded at the bottom of the secondary screen box (51), a first driving motor (53) is installed in an inner cavity of the mounting frame (52), and an eccentric throwing block (54) is fixedly connected to the surface of an output shaft of the first driving motor (53).

5. The intelligent coal washing vibrating screen with pre-diagnosis fault and alarm functions as claimed in claim 4, wherein the elastic assembly (6) comprises fixing seats (61) welded at four corners of the bottom of the secondary screen box (51), a supporting column (62) sliding with the fixing seats (61) penetrates through the bottom of the fixing seats (61), a fixing plate (63) is welded on the surface of the supporting column (62), a second spring (64) is sleeved on the surface of the supporting column (62), and the top end and the bottom end of the second spring (64) are respectively welded with the fixing seats (61) and the fixing plate (63).

6. The intelligent coal washing vibrating screen with the functions of pre-diagnosis of faults and alarming according to claim 5, wherein the displacement assembly (7) comprises a stepping motor (71) installed on the rear side of the top of the bottom plate (1), guide carriages (72) are welded on two sides of the top of the bottom plate (1), a rotatable threaded rod (73) is arranged in an inner cavity of each guide carriage (72), a threaded slider (74) is welded at the bottom of each supporting column (62), the threaded slider (74) is in threaded connection with the surface of each threaded rod (73), the front end of each threaded rod (73) is welded with the inner wall of each guide carriage (72) through a bearing, two belt discs (75) are fixedly connected to the rear end of each threaded rod (73) and the output shaft of each stepping motor (71), and the three belt discs (75) are in transmission connection through a belt.

7. The intelligent coal washing vibrating screen with the functions of pre-diagnosis of faults and alarming according to claim 6, wherein a second driving motor (15) is installed on the rear side of the top of the carrier plate (3), a second belt pulley (16) is fixedly connected to the output shaft of the second driving motor (15) and the rear end of the driving column (41), and the three second belt pulleys (16) are in transmission connection through the second belt pulley.

8. The intelligent coal washing vibrating screen with the functions of pre-diagnosis of faults and alarming according to claim 7, wherein the early warning assembly (8) comprises an audible and visual alarm (81) installed at the front end of the left side of the bottom plate (1), a rotating speed detector (82) is installed on the right side of the audible and visual alarm (81), a rotating plate (83) is welded at the left end of the front side conveying roller (12), and rotating speed sensors (84) corresponding to the rotating plate (83) are installed at the top and the bottom of the left side of the rotating plate (83).

9. The intelligent coal washing vibrating screen with pre-diagnosis fault and alarm functions according to claim 8, characterized in that the bottom of the carrier plate (3) is communicated with a wedge-shaped guide plate (14), and the wedge-shaped guide plate (14) is positioned right above the secondary screen box (51).

10. The intelligent coal washing vibrating screen with the functions of pre-diagnosis of faults and alarming as claimed in claim 9, wherein the surface of the oval plate (42) is provided with an annular groove matched with a butt plate (43), the inner cavity of the butt plate (43) is provided with a plurality of rotatable rollers (17), and the rollers (17) are in rolling contact with the oval plate (42).