CN108311218B

CN108311218B - Drum-type coal sample screening preparation device

Info

Publication number: CN108311218B
Application number: CN201810325605.6A
Authority: CN
Inventors: 陈志峰; 陆卫东; 郭梁辉; 王悦; 郭珊珊; 陈香瑾
Original assignee: Xinjiang Institute of Engineering
Current assignee: Xinjiang Institute of Engineering
Priority date: 2018-04-12
Filing date: 2018-04-12
Publication date: 2023-07-11
Anticipated expiration: 2038-04-12
Also published as: CN108311218A

Abstract

The invention discloses a drum-type coal sample screening and preparing device, which comprises a first motor, a second motor and a box body provided with a movable door, wherein a feed hopper is arranged at the top of the box body; the crushing rotary screen is fixedly arranged on the first rotary shaft, a plurality of pendulum weights are arranged on the part of the first rotary shaft, which is positioned in the crushing rotary screen, a feeding port which can be opposite to the feeding hopper is arranged on the crushing rotary screen, and the first motor can drive the first rotary shaft to rotate; the screening device is sleeved on the second rotating shaft and is formed by sleeving a plurality of rotary screens with different sizes, the screening device is communicated with a blanking hopper, an inlet of which can be opposite to the bottom of the crushing rotary screen, and the second rotating shaft can be driven to rotate; a dust collecting drawer is arranged below the screening device. The drum-type coal sample screening preparation device has the advantages of high screening efficiency, high automation degree and convenient use.

Description

Drum-type coal sample screening preparation device

Technical Field

The invention relates to the technical field of material screening equipment, in particular to a drum-type coal sample screening and preparing device.

Background

At present, the laboratory prepares the coal sample by adopting a sieve with corresponding mesh number to prepare the required coal sample manually after rough machining through a sampling machine, and the vibrating sieve is adopted to prepare the required coal sample, so that the laboratory is high in labor capacity, time-consuming and labor-consuming, and a large amount of coal dust generated in the sample preparation process not only can pollute experimental equipment, but also can harm the health of experimental staff. When a large amount of single variety of coal samples are processed by the sealed crusher and the combined crushing and dividing machine, sample pollution is avoided in sample preparation, and the sealed crusher and the combined crushing and dividing machine are not easy to clean, so that before the coal samples are processed, sampled coal is required to be used for flushing by a machine, the coal samples can be processed again after the flushing coal is discarded, and after the processing is finished, the repeated opening and stopping machine are required to be used for a plurality of times to clean the residual coal samples, and the process is tedious and not easy to operate.

Disclosure of Invention

The invention aims to provide a drum-type coal sample screening and preparing device, which solves the problems in the prior art, improves the screening efficiency of coal samples, reduces the labor intensity of workers in the sample preparation process, and avoids the harm to the health of workers and the pollution to the environment in the sample preparation process.

In order to achieve the above object, the present invention provides the following solutions: the invention provides a drum-type coal sample screening and preparing device which comprises a first motor, a second motor and a box body provided with a movable door, wherein a feed hopper is arranged at the top of the box body; the crushing rotary drum screen is fixedly arranged on the first rotary shaft, a plurality of pendulums are arranged on the part of the first rotary shaft, which is positioned in the crushing rotary drum screen, a feeding port which can be opposite to the feeding hopper is arranged on the crushing rotary drum screen, and the first rotary shaft can be driven to rotate by the first rotary shaft; the screening device is sleeved on the second rotating shaft and is formed by sleeving a plurality of rotary screens with different sizes, the screening device is communicated with a discharging hopper, an inlet of which can be opposite to the bottom of the crushing rotary screen, and the second rotating shaft can be driven to rotate; a dust collection drawer is arranged below the screening device.

Preferably, the feeding cover plate is rotatably connected to the feeding opening of the crushing drum screen, a handle is arranged on the feeding cover plate, the feeding cover plate can be opened and closed and is interlocked with the feed hopper micro-switch, and a movable door handle is arranged on the movable door of the box body.

Preferably, the automatic feeding device further comprises a PLC controller, a crushing switch, a screening switch, a master switch, a first infrared emitter, a first infrared receiver, a second infrared emitter and a second infrared receiver, wherein the first motor, the second motor, the crushing switch, the screening switch, the master switch, the first infrared emitter, the first infrared receiver, the second infrared emitter and the second infrared receiver are respectively and electrically connected with the PLC controller, the first infrared emitter, the first infrared receiver, the second infrared emitter and the second infrared receiver are respectively and fixedly arranged on the inner wall of the box body, and when a feed inlet of the crushing drum screen is opposite to the feed hopper, a handle on the feed cover plate which is closed with the crushing drum screen is positioned between the first infrared emitter and the first infrared receiver, and when an inlet of the lower hopper is opposite to the bottom of the crushing drum screen, the lower hopper is positioned between the second infrared emitter and the second infrared receiver.

Preferably, the device further comprises a voltmeter and an ammeter which are electrically connected with the PLC, wherein the PLC, the crushing switch, the screening switch, the main switch, the voltmeter and the ammeter are all arranged in a control box on the outer side wall of the box body.

Preferably, the first motor drives the first rotating shaft to rotate through a first belt transmission mechanism, and the first belt transmission mechanism comprises a first belt pulley arranged on an output shaft of the first motor, a second belt pulley arranged on the first rotating shaft and a first belt wound on the first belt pulley and the second belt pulley; the second motor drives the second rotating shaft to rotate through a second belt transmission mechanism, and the second belt transmission mechanism comprises a third belt pulley arranged on an output shaft of the second motor, a fourth belt pulley arranged on the second rotating shaft and a second belt wound on the third belt pulley and the fourth belt pulley.

Preferably, an inverted cone-shaped crushed coal collecting cover is arranged below the crushing roller screen, a crushed coal discharging hole is formed in the center of the bottom of the crushed coal collecting cover, and the feeding hole of the discharging hopper can be opposite to the crushed coal discharging hole; the lower part of the screening device is provided with an inverted cone-shaped coal dust collecting cover, and the middle of the bottom of the coal dust collecting cover is provided with a dust outlet right opposite to the dust collecting drawer.

Preferably, the screening device is formed by sleeving three rotary screens with different sizes.

Preferably, a feed hopper micro-interlocking switch is arranged at the feed hopper, and a movable door micro-interlocking switch is arranged on a movable door of the box body.

Preferably, both ends of the first rotating shaft and both ends of the second rotating shaft are respectively in rotational connection with the inner wall of the box body through bearings.

Preferably, the bin cover is rotatably arranged at the communication part of the box body and the feeding hopper, and a bin cover handle is arranged on the bin cover.

Compared with the prior art, the drum-type coal sample screening and preparing device has the following technical effects:

the drum-type coal sample screening and preparing device can continuously prepare samples, the automation degree of the sample preparing process is high, and the labor intensity of operators is greatly reduced; the screening of the coal sample is completed in the closed box body, so that the coal dust is prevented from damaging the health of staff and polluting the environment; the infrared rays are utilized to enable the feeding port of the crushing roller to be opposite to the discharging port of the feeding hopper and the discharging hopper of the screening device to be just opposite to the crushed coal discharging port of the crushed coal collecting cover, so that the efficiency is high; three layers of drum sieves with different sizes in the screening device can screen three kinds of coal samples with different sizes, and the drum sieves with specific mesh numbers can be directly arranged in the screening device for screening according to the size of the required coal samples, so that the use is very convenient; the drum-type coal sample screening preparation device can be applied to screening preparation of coal samples, and can also be applied to screening preparation of mineral aggregates, medicines and other materials.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a side cross-sectional view of a drum-type coal sample screening and preparing apparatus of the present invention;

FIG. 2 is a front cross-sectional view of a drum-type coal sample screening and preparing apparatus of the present invention;

FIG. 3 is a schematic diagram of a drum-type coal sample screening and preparing device according to the present invention;

FIG. 4 is a schematic diagram of a screening device in a drum-type coal sample screening preparation device according to the present invention;

FIG. 5 is a schematic view of a screen in a screening apparatus of a roll-type coal sample screening manufacturing apparatus according to an aspect of the present invention;

FIG. 6 is a schematic view of a screen in a screening apparatus of a drum-type coal sample screening and preparing apparatus according to another view of the screen;

wherein, the device comprises a 1-box body, a 2-first rotating shaft, a 3-second rotating shaft, a 4-crushing roller screen, a 5-screening device, a 6-feed hopper, a 7-pendulum, an 8-crushed coal collecting cover, a 9-blanking hopper, a 10-coal dust collecting cover, an 11-dust collecting drawer, a 12-second belt pulley, a 13-fourth belt pulley, a 14-feed hopper micro-interlocking switch, a 15-movable door micro-interlocking switch, a 16-first bearing seat, a 17-second bearing seat, a 18-first bearing, a 19-second bearing, a 20-screening device door, a 21-bin cover, a 22-bin cover handle, a 23-feeding cover plate, a 24-second infrared transmitter and a 25-second infrared receiver, 26-outer layer roller screen, 27-middle layer roller screen, 28-inner layer roller screen, 29-first belt, 30-second belt, 31-first motor, 32-second motor, 33-motor shield, 34-control box, 35-rear end cap button, 36-ammeter, 37-voltmeter, 38-PLC controller, 39-master switch, 40-break switch, 41-screening switch, 42-first belt pulley, 43-third belt pulley, 44-display screen, 45-front end cap button, 46-movable door handle, 47-rivet, 48-screen, 49-frame, 50-movable door, 51-first infrared transmitter, 52-first infrared receiver.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The invention provides a drum-type coal sample screening and preparing device which comprises a first motor, a second motor and a box body provided with a movable door, wherein a feed hopper is arranged at the top of the box body; the crushing rotary drum screen is fixedly arranged on the first rotary shaft, a plurality of pendulums are arranged on the part of the first rotary shaft, which is positioned in the crushing rotary drum screen, a feeding port which can be opposite to the feeding hopper is arranged on the crushing rotary drum screen, and the first rotary shaft can be driven to rotate by the first rotary shaft; the screening device is sleeved on the second rotating shaft and is formed by sleeving a plurality of rotary screens with different sizes, the screening device is communicated with a discharging hopper, an inlet of which can be opposite to the bottom of the crushing rotary screen, and the second rotating shaft can be driven to rotate; a dust collection drawer is arranged below the screening device.

The drum-type coal sample screening and preparing device can continuously prepare samples, the automation degree of the sample preparing process is high, and the labor intensity of operators is greatly reduced; the screening of the coal sample is completed in the closed box body, so that the coal dust is prevented from harming the health of workers and polluting the environment.

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

Example 1

As shown in fig. 1-3, the drum-type coal sample screening preparation device of the embodiment comprises a first motor 31, a second motor 32 and a box body 1 provided with a movable door 50, wherein the movable door 50 of the box body 1 is provided with a movable door inching interlocking switch 15, and the movable door 50 is provided with a movable door handle 46; the box 1 top is provided with feeder hopper 6, and feeder hopper 6 department is provided with feeder hopper micro-motion interlocking switch 14, and box 1 rotates with feeder hopper 6 intercommunication department and is provided with feed bin lid 21, is provided with feed bin lid handle 22 on the feed bin lid 21, can rotate feed bin lid 21 through feed bin lid handle 22 to make the passageway of box 1 top and feeder hopper 6 open or close.

The upper part inside the box body 1 is provided with a crushing unit, the crushing unit comprises a first rotating shaft 2 and a crushing rotary screen 4, the first rotating shaft 2 is horizontally arranged, the left end of the first rotating shaft 2 is rotationally connected with a first bearing seat 16 on the inner wall of the box body 1 through a bearing, and the right end of the first rotating shaft 2 is rotationally connected with the other inner wall of the box body 1 through a first bearing 18; the crushing rotary screen 4 is also horizontally arranged, the first rotary shaft 2 is positioned on the central axis of the crushing rotary screen 4, and the crushing rotary screen 4 is fixedly connected with the first rotary shaft 2, namely, the crushing rotary screen 4 can rotate along with the rotation of the first rotary shaft 2, the first rotary shaft 2 is driven to rotate by the first motor 31 through a first belt 29 transmission mechanism, and the first belt 29 transmission mechanism comprises a first belt pulley 42 arranged on the output shaft of the first motor 31, a second belt pulley 12 arranged on the first rotary shaft 2 and a first belt 29 wound on the first belt pulley 42 and the second belt pulley 12; the part of the first rotary shaft 2 positioned in the crushing rotary screen 4 is provided with a plurality of pendulums 7, a feeding cover plate 23 is also rotatably connected to a feeding hole on the wall of the crushing rotary screen 4, and the feeding hole of the crushing rotary screen 4 can be opened or closed by rotating the feeding cover plate 23; the feed inlet on the crushing rotary screen 4 can be opposite to the feed inlet of the channel of the top end of the box body 1 communicated with the feed hopper 6.

An inverted cone-shaped crushed coal collecting cover 8 is arranged inside the box body 1 and below the crushing unit, and a crushed coal discharge hole is formed in the middle of the bottom of the crushed coal collecting cover 8.

A screening unit is further arranged inside the box body 1 below the crushed coal collecting cover 8, the screening unit further comprises a second rotating shaft 3 and a screening device 5, the second rotating shaft 3 is horizontally arranged, the left end of the second rotating shaft 3 is rotatably connected with a second bearing seat 17 on the inner wall of the box body 1 through a bearing, and the right end of the second rotating shaft 3 is rotatably connected to the other inner wall of the box body 1 through a second bearing 19; as shown in fig. 4, in this embodiment, the screening device 5 is formed by sleeving an outer layer roller screen 26, a middle layer roller screen 27 and an inner layer roller screen 28, a rear end cover of the screening device 5 is connected with the outer layer roller screen 26 of the screening device 5 through a rear end cover buckle 35, a screening device door 20 is connected with the outer layer roller screen 26 of the screening device 5 through a front end cover buckle 45, the outer layer roller screen 26, the middle layer roller screen 27 and the inner layer roller screen 28 are coaxial, a second rotating shaft 3 is located on a central axis of the screening device 5, and the second rotating shaft 3 is fixedly connected with the screening device 5, namely, the second rotating shaft 3 can drive the screening device 5 to rotate; the second motor 32 drives the second rotating shaft 3 to rotate through a second belt 30 transmission mechanism, and the second belt 30 transmission mechanism comprises a third belt pulley 43 arranged on an output shaft of the second motor 32, a fourth belt pulley 13 arranged on the second rotating shaft 3 and a second belt 30 wound on the third belt pulley 43 and the fourth belt pulley 13; in this embodiment, the screening device door 20 on the right side of the screening device 5 is connected to the discharging hopper 9, and when the screening device 5 rotates to a proper position, the inlet of the discharging hopper 9 can be opposite to the crushed coal discharging port of the crushed coal collecting hood 8 under the action of the second infrared emitter 24 and the second infrared receiver 25.

The first motor 31 and the second motor 32 are arranged on the outer side wall of the box body 1, and a motor protection cover 33 with a door leaf is covered on the first motor 31 and the second motor 32; an inverted cone-shaped coal dust collecting cover 10 is arranged inside the box body 1 and below the screening unit, a dust outlet is formed in the middle of the bottom of the coal dust collecting cover 10, and a dust collecting drawer 11 which is opposite to the dust outlet is arranged in the bottom of the box body 1.

The side wall of the box body 1 is also provided with a control box 34, the control box 34 is internally provided with a PLC (programmable logic controller) 38, a crushing switch 40, a screening switch 41, a main switch 39, a voltmeter 37, an ammeter 36 and a display screen 44, the inner wall of the box body 1 is provided with a first infrared emitter 51, a first infrared receiver 52, a second infrared emitter 24 and a second infrared receiver 25, the arrangement positions of the first infrared emitter 51 and the first infrared receiver 52 are required to meet the condition that when a feed port of the crushing rotary screen 4 is opposite to a feed channel at the top end of the box body 1, a handle on a feed cover plate 23 which is closed with the crushing rotary screen 4 is just positioned between the first infrared emitter 51 and the first infrared receiver 52, and the signal transmission between the first infrared emitter 51 and the first infrared receiver 52 can be cut off; the arrangement positions of the second infrared emitter 24 and the second infrared receiver 25 are required to meet the requirement that when the inlet of the blanking hopper 9 is right opposite to the crushed coal discharge port, the blanking hopper 9 is just positioned between the second infrared emitter 24 and the second infrared receiver 25, and the signal transmission between the second infrared emitter 24 and the second infrared receiver 25 can be cut off; the first motor 31, the second motor 32, the crushing switch 40, the screening switch 41, the main switch 39, the voltmeter 37, the ammeter 36, the display screen 44, the first infrared transmitter 51, the first infrared receiver 52, the second infrared transmitter 24, the second infrared receiver 25, the hopper micro-motion interlocking switch 14 and the movable door micro-motion interlocking switch 15 are electrically connected with the PLC controller 38, respectively.

When the drum-type coal sample screening preparation device is used, the main switch 39 is turned on firstly, the PLC 38 controls the first infrared emitter 51 and the second infrared emitter 24 to emit infrared signals, the first infrared receiver 52 and the second infrared receiver 25 receive the infrared signals, at the moment, the first motor 31 drives the crushing drum screen 4 to rotate, and the second motor 32 drives the screening device 5 to rotate; when the handle of the feeding cover plate 23 is positioned between the first infrared emitter 51 and the first infrared receiver 52, the handle of the feeding cover plate 23 cuts off signal transmission between the first infrared emitter 51 and the first infrared receiver 52, the first motor stops rotating, the feeding port of the crushing rotary screen 4 is opposite to the feeding channel at the top end of the box body 1, meanwhile, the blanking hopper 9 is exactly cut off signal transmission between the second infrared emitter 24 and the second infrared receiver 25 when the blanking hopper 9 is exactly positioned between the second infrared emitter 24 and the second infrared receiver 25, so that the PLC 38 controls the second motor 32 to stop rotating, and the feeding port of the blanking hopper 9 is opposite to the crushed coal discharging port; then the bin cover 21 is opened, the feed hopper micro-interlocking switch 14 is triggered, the PLC controller controls the first motor 31 and the second motor 32 to stop rotating, then the bin cover 21 is opened through the bin cover handle 22, the feeding cover plate 23 of the crushing rotary screen 4 is opened, then the large-block coal sample enters the crushing rotary screen 4 through the feed hopper 6, the feeding cover plate 23 and the bin cover 21 are covered after the large-block coal sample feeding is completed, and the feed hopper micro-interlocking switch 14 is reset and closed; then, the crushing switch 40 is turned on, the first motor 31 drives the first rotating shaft 2 and the crushing drum screen 4 to rotate, at this time, the operation of the second motor 32 is not influenced by the first infrared emitter 51 and the first infrared receiver 52, the large coal sample in the crushing drum screen 4 is subjected to hammer crushing under the action of the pendulum 7 to form crushed coal, the crushed coal leaks out of the crushing drum screen 4, the crushed coal enters the inner drum screen 28 through the crushed coal collecting cover 8 and the lower hopper 9, after the crushing of the large coal sample in the crushing drum screen 4 is completed, the crushing switch 40 is turned off, the movable door 50 is turned on, the movable door micro-motion interlocking switch 15 is triggered, the PLC controller controls the first motor 31 and the second motor 32 to stop rotating, the hopper cover of the lower hopper 9 is turned off, then the movable door 50 is turned off, the screening switch 41 is turned on, the second motor 32 drives the second rotating shaft 3 and the screening device 5 to rotate, at this time, the operation of the second motor 32 is not influenced by the second infrared emitter 24 and the second infrared receiver 25, the crushed coal sample in the inner drum screen 28 is finally, the coal sample in the inner drum screen 28 is sieved through the inner drum screen 28, the three dust screens 27 and the three dust collecting screens 26 are formed by the different drum screens, and the number of the three dust collecting screens 20 are sieved through the drum screens 10, and the three dust collecting screens in the drum screens are different drum screens are turned on the outer drum screens, and the dust collecting device is turned off, and the dust collecting the dust is different, and the dust is sieved through the dust collecting device is separated by the dust from the dust is separated by the dust.

It should be noted that, the hopper micro-interlocking switch 14 is triggered only by opening the bin cover 21, the movable door micro-interlocking switch 15 is triggered only by opening the movable door 50, the hopper micro-interlocking switch 14 and the movable door micro-interlocking switch 15 are electrically connected with the PLC controller 38, and when the hopper micro-interlocking switch 14 and/or the movable door micro-interlocking switch 15 are triggered, the PLC controller 38 sends a signal to stop the rotation of the first motor 31 and the second motor 32, so as to ensure the personal safety when the staff enters the device, and improve the safety factor of the device.

The sieves in the inner layer drum sieve 28, the middle layer drum sieve 27 and the outer layer drum sieve 26 are all detachably mounted, specifically, each layer of sieve is composed of rivets 47, a screen 48 and a frame 49, a rubber capable of playing a sealing role is arranged on the frame 49, and each layer of sieve is fixed on the main body of the sieving device 5 by using a clamp, so that the specific mesh number of each layer of sieve in the embodiment can be flexibly set according to actual requirements, and only the sieves with required mesh number are required to be inserted into the drum and the front end cover and the rear end cover are covered.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims

1. A drum-type coal sample screening prepares device which characterized in that: the device comprises a first motor, a second motor and a box body provided with a movable door, wherein a feed hopper is arranged at the top of the box body, and a first rotating shaft and a second rotating shaft, both ends of which are respectively connected to the inner wall of the box body in a rotating way, are sequentially and horizontally arranged in the box body from top to bottom; the crushing rotary drum screen is fixedly arranged on the first rotary shaft, a plurality of pendulums are arranged on the part of the first rotary shaft, which is positioned in the crushing rotary drum screen, a feeding port which can be opposite to the feeding hopper is arranged on the crushing rotary drum screen, and the first rotary shaft can be driven to rotate by the first rotary shaft; the screening device is sleeved on the second rotating shaft and is formed by sleeving a plurality of rotary screens with different sizes, the screening device is communicated with a discharging hopper, an inlet of which can be opposite to the bottom of the crushing rotary screen, and the second rotating shaft can be driven to rotate; a dust collection drawer is arranged below the screening device;

the feeding cover plate is rotatably connected to the feeding hole of the crushing drum screen, a handle is arranged on the feeding cover plate, the feeding cover plate can be opened and closed, and a movable door handle is arranged on a movable door of the box body; still include PLC controller, broken switch, screening switch, master switch, first infrared emitter, first infrared receiver, second infrared emitter and second infrared receiver, first motor, second motor, broken switch, screening switch, master switch, first infrared emitter, first infrared receiver, second infrared emitter and second infrared receiver respectively with the PLC controller electricity is connected, first infrared emitter, first infrared receiver, second infrared emitter and second infrared receiver set firmly respectively on the inner wall of box, and work as the feed inlet of broken drum sieve is just to the feeder hopper, with handle on the feeding apron of broken drum sieve closure is located between first infrared emitter and the first infrared receiver, work as the entry of hopper just to the bottom of broken drum sieve down the hopper is located between second infrared emitter and the second infrared receiver.

2. The drum type coal sample screening preparation device according to claim 1, wherein: the multifunctional box further comprises a voltmeter and an ammeter which are electrically connected with the PLC, wherein the PLC, the crushing switch, the screening switch, the main switch, the voltmeter and the ammeter are all arranged in a control box on the outer side wall of the box body.

3. The drum type coal sample screening preparation device according to claim 1 or 2, wherein: the first motor drives the first rotating shaft to rotate through a first belt transmission mechanism, and the first belt transmission mechanism comprises a first belt pulley arranged on an output shaft of the first motor, a second belt pulley arranged on the first rotating shaft and a first belt wound on the first belt pulley and the second belt pulley; the second motor drives the second rotating shaft to rotate through a second belt transmission mechanism, and the second belt transmission mechanism comprises a third belt pulley arranged on an output shaft of the second motor, a fourth belt pulley arranged on the second rotating shaft and a second belt wound on the third belt pulley and the fourth belt pulley.

4. The drum type coal sample screening preparation device according to claim 1 or 2, wherein: an inverted cone-shaped crushed coal collecting cover is arranged below the crushing roller screen, a crushed coal discharging hole is formed in the center of the bottom of the crushed coal collecting cover, and a feeding hole of the discharging hopper can be opposite to the crushed coal discharging hole; the lower part of the screening device is provided with an inverted cone-shaped coal dust collecting cover, and the middle of the bottom of the coal dust collecting cover is provided with a dust outlet right opposite to the dust collecting drawer.

5. The drum type coal sample screening preparation device according to claim 1 or 2, wherein: the screening device is formed by sleeving three rotary screens with different sizes.

6. The drum type coal sample screening preparation device according to claim 1 or 2, wherein: the feeding hopper is provided with a feeding hopper micro-interlocking switch, and a movable door micro-interlocking switch is arranged on a movable door of the box body.

7. The drum type coal sample screening preparation device according to claim 1 or 2, wherein: both ends of the first rotating shaft and both ends of the second rotating shaft are respectively connected with the inner wall of the box body in a rotating way through bearings.

8. The drum type coal sample screening preparation device according to claim 1 or 2, wherein: the box with the feed hopper intercommunication department rotates and is provided with the feed bin lid, the feed bin is covered and is provided with feed bin lid handle.