Self-cleaning multi-particle-size coal sample preparation device and multi-particle-size coal sample preparation method

Abstract

The invention discloses a self-cleaning multi-particle-size coal sample preparation device and a multi-particle-size coal sample preparation method.The self-cleaning multi-particle-size coal sample preparation device comprises a screening system, the screening system comprises a screening frame, a discharging opening is formed in the top of the screening frame, a screening net with the mesh hole diameter decreasing layer by layer is arranged in the screening frame in the discharging direction, and the side wall of the screening frame communicates with a hollow pipe; one hollow pipe abuts against the upper side face of the bottom of the screen frame, the other hollow pipes correspond to the screen cloth in a one-to-one mode and abut against the upper side face of the screen cloth, a spraying cleaning system, a coal sample crushing system and a coal sample bearing system are sequentially connected between a feeding port in the screen frame and the screen cloth in the discharging direction, and the screen frame is connected with a vibration system. The invention further discloses a preparation method of the multi-particle-size coal sample, the coal sample is subjected to crushing and vibrating screen separation through the self-cleaning preparation device of the multi-particle-size coal sample, the device is cleaned after separation is completed, after the coal sample is crushed and screened, the device can be cleaned through spraying, and coal sample pollution caused by mixing of different coal samples is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of coal sample preparation devices, and in particular relates to a self-cleaning multi-particle size coal sample preparation device and a multi-particle size coal sample preparation method. Background Art

[0002] As an important resource, coal has always occupied a major position in the energy production and consumption structure. Coal sample inspection and testing is the process of testing and analyzing the quality, composition, properties and possible harmful factors of coal samples. The test results are one of the main bases for evaluating the properties and uses of coal. Coal sample preparation is an important link before coal sample testing. The quality of coal sample preparation has a crucial impact on the subsequent test results.

[0003] Coal sample preparation is to prepare a large number of large-particle coal samples into analytical and testing coal samples of smaller mass and smaller particle size without bias. The commonly used coal sample preparation methods are manual or machine sample preparation. Manual sample preparation is inefficient, and the coal dust generated during the sample preparation process can easily cause occupational hazards and environmental pollution. The commonly used sample preparation equipment has low sample preparation efficiency and a single particle size, which cannot meet the preparation of multi-particle size coal samples. In addition, the equipment is difficult to clean and easily causes coal sample contamination. This will make it difficult to meet the requirements of inspection and testing work for high-quality preparation of coal samples. Therefore, it is urgent to develop a multi-particle size coal sample preparation and self-cleaning device and method.

[0004] The Chinese utility model patent with authorization announcement number CN205323956U, application date 2015.12.30, and publication date 2016.06.22 discloses a multi-particle size coal sample integrated grinding and screening device, which includes a grinder support platform, a feed port, an upper grinder, an intermediate material guide port, a lower grinder, a tail end material guide port, an inclined material guide smooth pipe, a linear vibrating screen, an upper grinder motor, a lower grinder motor, a belt, and a base. The feed port, the upper grinder, the intermediate material guide port, the lower grinder, and the tail end material guide port are installed on the grinder support platform from top to bottom, and the grinder support platform is installed on the base. The upper end of the inclined material guide smooth pipe is connected to the tail end material guide port, and the lower end is connected to the linear vibrating screen. The linear vibrating screen can screen out coal samples of different particle sizes. The device realizes the flow operation of crushing, grinding, and screening through the organic combination of the crushing and grinding system and can directly screen out coal samples of various particle sizes. However, the device is not equipped with a cleaning system, and coal sample contamination may easily occur due to mixing of different coal samples during the coal sample preparation process. Summary of the invention

[0005] The purpose of the present invention is to provide a self-cleaning multi-particle size coal sample preparation device, which solves the problem of coal sample contamination caused by mixing different coal samples during the coal sample preparation process in the prior art.

[0006] The present invention also aims to provide a method for preparing coal samples with multiple particle sizes.

[0007] The technical solution adopted by the self-cleaning multi-particle size coal sample preparation device of the present invention is: it includes a screening system, the screening system includes a screen frame, a feeding port is provided on the top of the screen frame, and a plurality of screens parallel to each other and with gradually decreasing mesh apertures are arranged in sequence in the screen frame along the feeding direction, and the side wall of the screen frame is connected to a plurality of hollow tubes perpendicular to the feeding direction, one of which is against the upper side surface of the bottom of the screen frame, and the remaining hollow tubes are arranged one by one in correspondence with the screens and against the upper side surface of the screens, and a spray cleaning system, a coal sample crushing system, and a coal sample supporting system are connected in sequence between the feeding port in the screen frame and the screen with the largest mesh aperture along the feeding direction, and the coal sample supporting system includes an opening and closing component, a vibration system is connected to one side of the screen frame, and a spring is fixed to the outer side of the bottom of the screen frame.

[0008] The present invention is also characterized in that: The screen frame includes a top cover, which is hinged to the side wall of the screen frame. The spray cleaning system includes a spray head, which is fixed to the inner side of the top cover. The water inlet of the spray head is connected to a water pipe, which is connected to the top cover. The end of the water pipe away from the spray head is connected to a water pump.

[0009] The coal sample crushing system includes a blade located between the top cover and the coal sample supporting system, the blade is connected to the transmission shaft, the transmission shaft includes a vertical axis extending along the feeding direction, and also includes a horizontal axis perpendicular to the feeding direction. The blade is located at the upper end of the vertical axis along the feeding direction, and the lower end of the vertical axis along the feeding direction is connected to the horizontal axis. The horizontal axis passes through the side wall of the screen frame, and the horizontal axis is located between the coal sample supporting system and the screen with the largest mesh aperture. The end of the horizontal axis away from the vertical axis is connected to the motor.

[0010] The coal sample supporting system includes a tray, which is located between the blade and the screen with the largest mesh size. The tray is provided with a central through hole, and the opening and closing assembly is connected to the through hole of the tray. The opening and closing assembly includes several groups of racks fixed to the tray, and the racks are provided with gears meshing with the racks. Rotating blades are fixed to the gears, and the middle part of the vertical axis of the transmission shaft is connected to all the gears.

[0011] The screening system is provided with an outer shell, a switch door is installed on the side wall of the outer shell, a counterweight is fixedly connected to the inner bottom of the outer shell, there are several springs, the elastic direction of the several springs is the feeding direction, one end of the spring is fixedly connected to the counterweight, and the other end is fixedly connected to the bottom of the screen frame, a water bucket is provided in the outer shell, the mouth of the water bucket is located below the end of the hollow tube outside the screen frame, a water outlet pipe is penetrated through the side wall of the bottom of the water bucket, and the water outlet pipe passes through the outer shell.

[0012] An air blowing and purge system is connected between the tray and the feed port. The air blowing and purge system includes a fan. An air duct is connected to the air outlet end of the fan. One end of the air duct away from the fan is connected to the screen frame.

[0013] The water pump, motor, ultrasonic controller and fan are all electrically connected to a central control computer, which includes a power supply, a display and buttons.

[0014] Another technical solution of the present invention is: a method for preparing a multi-particle size coal sample, using a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Control the opening and closing assembly to close, load the coal sample onto the top of the coal sample supporting system, and sleeve the coal sample bag onto one end of the hollow tube outside the screen frame; Step 2: crushing the coal sample by the coal sample crushing component. After the crushing is completed, the opening and closing component is controlled to open, so that the coal sample falls from the coal sample supporting system into the screen of the screen frame; Step 3: Use a vibration system to vibrate the screen frame, so that the coal samples with a particle size smaller than the aperture of the current screen will fall into the lower screen, and the coal samples with a particle size smaller than the lowest screen will fall to the bottom of the screen frame. The coal samples remaining in each layer of the screen will be vibrated into the coal sample bag through the hollow tube of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag will be removed; Step 4: Use the spray cleaning system to clean the inside of the screen frame. After the sewage is discharged from the hollow pipe, turn off the water pump.

[0015] Another technical solution of the present invention is characterized in that: After loading the coal sample and before crushing the coal sample, if the coal sample is a wet coal sample, turn on the fan, and the fan will send air to the screen frame through the air duct.

[0016] After turning off the water pump, turn on the fan, which will deliver air to the screen frame through the air duct.

[0017] The beneficial effects of the present invention are: Compared with the prior art, the present invention provides a spray device in the self-cleaning multi-particle size coal sample preparation device. After the coal samples are crushed and screened, the device can be cleaned by the spray device to prevent coal sample contamination caused by mixing of different coal samples during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall structural diagram of the self-cleaning multi-particle size coal sample preparation device of the present invention; Figure 2 This is a schematic diagram of the structure of the screening system of the present invention and various systems connected to the screening system: Figure 3 It is a structural diagram of the coal sample supporting system of the self-cleaning multi-particle size coal sample preparation device of the present invention; Figure 4 It is a schematic diagram of the rack and gear structure in the opening and closing assembly of the self-cleaning multi-particle size coal sample preparation device of the present invention; Figure 5 It is a control principle diagram of the self-cleaning multi-particle size coal sample preparation device of the present invention.

[0019] In the figure: 1. Central control computer; 2. Screening system; 201. Screen frame; 202. Screen; 2021. First screen; 2022. Second screen; 2023. Third screen; 203. Feeding port; 204. Hollow tube; 2041. First hollow tube; 2042. Second hollow tube; 2043. Third hollow tube; 2044. Fourth hollow tube; 205. Top cover; 206. Lock; 3. Spray cleaning system; 301. Water pump; 302. Water pipe; 303. Spray head; 304. Water inlet pipe; 4. Coal sample crushing system; 401. Blade; 402. Motor; 403. Drive shaft; 4031. Vertical axis; 4032. Horizontal axis; 5. Coal sample supporting system; 501. Tray; 502. Through hole; 503. Opening and closing assembly; 5031. rack; 5032. gear; 5033. rotating blade; 6. vibration system; 601. ultrasonic controller; 602. vibrator; 6021. first vibrator; 6022. second vibrator; 6023. third vibrator; 7. air blowing system; 701. fan; 702. air duct; 8. casing; 801. door; 802. handle; 803. spring; 804. counterweight; 805. bucket; 806. water outlet pipe; 807. load-bearing wheel. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The self-cleaning multi-particle size coal sample preparation device of the present invention is as follows: Figure 1 As shown, the screening system 2 includes a screen frame 201, a feed opening 203 is provided on the top of the screen frame 201, a plurality of screens 202 which are parallel to each other and whose mesh apertures decrease layer by layer are arranged in sequence in the screen frame 201 along the feed direction, the side wall of the screen frame 201 is connected to a plurality of hollow tubes 204 which are perpendicular to the feed direction, one of which is against the upper side surface of the bottom of the screen frame 201, and the remaining hollow tubes 204 are arranged in a one-to-one correspondence with the screen 202 and against the upper side surface of the screen 202, a spray cleaning system 3, a coal sample crushing system 4, and a coal sample supporting system 5 are connected in sequence between the feed opening 203 in the screen frame 201 and the screen 202 with the largest mesh aperture along the feed direction, the coal sample supporting system 5 includes an opening and closing component 503, a vibration system 6 is connected to one side of the screen frame 201, and a spring 803 is fixed to the outer side of the bottom of the screen frame 201.

[0022] The technical solution of the present invention is characterized in that: The screen frame 201 includes a top cover 205, which is hinged to the side wall of the screen frame 201. The spray cleaning system 3 includes a spray head 303, which is fixed to the inner side of the top cover 205. The water inlet of the spray head 303 is connected to the water pipe 302, the water pipe 302 is connected to the top cover 205, and the end of the water pipe 302 away from the spray head 303 is connected to the water pump 301.

[0023] like Figure 2 As shown, the coal sample crushing system 4 includes a blade 401 located between the top cover 205 and the coal sample supporting system 5, the blade 401 is connected to the transmission shaft 403, the transmission shaft 403 includes a vertical axis 4031 extending along the feeding direction, and also includes a horizontal axis 4032 perpendicular to the feeding direction, the blade 401 is located at the upper end of the vertical axis 4031 along the feeding direction, the lower end of the vertical axis 4031 along the feeding direction is connected to the horizontal axis 4032, the horizontal axis 4032 passes through the side wall of the screen frame 201, the horizontal axis 4032 is located between the coal sample supporting system 5 and the screen 202 with the largest mesh aperture, and the end of the horizontal axis 4032 away from the vertical axis 4031 is connected to the motor 402.

[0024] like Figure 3 As shown, the coal sample supporting system 5 includes a tray 501, the tray 501 is located between the blade 401 and the screen 202 with the largest mesh aperture, the tray 501 is provided with a central through hole 502, the opening and closing assembly 503 is connected to the through hole of the tray 501, and the opening and closing assembly includes a plurality of racks 5031 fixedly connected to the tray 501, as shown in FIG. Figure 4 As shown, a gear 5032 meshing with the rack 5031 is provided on the rack 5031 , a rotating blade 5033 is fixedly connected to the gear 5032 , and the middle part of the vertical axis 4031 of the transmission shaft 403 is transmission-connected with all the gears 5032 .

[0025] The screening system 2 is provided with an outer shell 8, and a switch door 801 is installed on the side wall of the outer shell 8. A counterweight block 804 is fixedly connected to the inner bottom of the outer shell 8. There are several springs 803, and the elastic direction of the several springs 803 is the feeding direction. One end of the spring 803 is fixedly connected to the counterweight block 804, and the other end is fixedly connected to the bottom of the screen frame 201. A water bucket 805 is provided in the outer shell 8, and the mouth of the water bucket 805 is located below the end of the hollow tube 204 outside the screen frame 201. A water outlet pipe 806 is penetrated through the bottom side wall of the water bucket 805, and the water outlet pipe 806 penetrates out of the outer shell 8.

[0026] An air blowing system 7 is connected between the tray 501 and the discharge port 203 . The air blowing system 7 includes a fan 701 . An air duct 702 is connected to the air outlet of the fan 701 . An end of the air duct 702 away from the fan 701 is connected to the screen frame 201 .

[0027] like Figure 5 As shown, the water pump 301, the motor 402, the ultrasonic controller 601, and the fan 701 are all electrically connected to the central control computer 1, and the central control computer 1 includes a power supply, a display, and buttons.

[0028] The method for preparing a multi-particle size coal sample of the present invention uses a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Control the opening and closing assembly 503 to close, load the coal sample onto the top of the coal sample supporting system 5, and sleeve the coal sample bag onto one end of the hollow tube 204 outside the screen frame 201; Step 2: The coal sample is crushed by the coal sample crushing system 4. After the crushing is completed, the opening and closing component 503 is controlled to open, so that the coal sample falls from the coal sample supporting system 5 into the screen 202 of the screen frame 201; Step 3: Use the vibration system 6 to vibrate the screen frame 201, so that the coal samples with a particle size smaller than the aperture of the current screen 202 fall into the lower screen 202, and the coal samples with a particle size smaller than the bottom screen 202 fall into the bottom of the screen frame 201, and the coal samples remaining in each layer of the screen 202 are vibrated into the coal sample bag through the hollow tube 204 of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag is removed; Step 4: Use the spray cleaning system 3 to clean the inside of the screen frame 201. After the sewage is discharged from the hollow pipe 204, turn off the water pump 301.

[0029] Another technical solution of the present invention is also characterized in that: After loading the coal sample and before crushing the coal sample, if the coal sample is a wet coal sample, turn on the fan 701, and the fan 701 supplies air to the screen frame 201 through the air duct 702.

[0030] After turning off the water pump 301 , the fan 701 is turned on, and the fan 701 supplies air to the screen frame 201 through the air duct 702 .

[0031] Embodiment 1 The self-cleaning multi-particle size coal sample preparation device includes a screening system 2, which includes a screen frame 201. A feed opening 203 is provided on the top of the screen frame 201. A plurality of screens 202 which are parallel to each other and whose mesh apertures decrease layer by layer are arranged in sequence in the screen frame 201 along the feed direction. The side wall of the screen frame 201 is connected to a plurality of hollow tubes 204 which are perpendicular to the feed direction. One of the hollow tubes 204 is against the upper side surface of the bottom of the screen frame 201, and the remaining hollow tubes 204 are arranged in a one-to-one correspondence with the screen 202 and against the upper side surface of the screen 202. A spray cleaning system 3, a coal sample crushing system 4, and a coal sample supporting system 5 are connected in sequence between the feed opening 203 in the screen frame 201 and the screen 202 with the largest mesh aperture along the feed direction. The coal sample supporting system 5 includes an opening and closing component 503. A vibration system 6 is connected to one side of the screen frame 201. A spring 803 is fixed to the outer side of the bottom of the screen frame 201.

[0032] The method for preparing a multi-particle size coal sample of the present invention uses a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Control the opening and closing assembly 503 to close, load the coal sample onto the top of the coal sample supporting system 5, and sleeve the coal sample bag onto one end of the hollow tube 204 outside the screen frame 201; Step 2: The coal sample is crushed by the coal sample crushing system 4. After the crushing is completed, the opening and closing component 503 is controlled to open, so that the coal sample falls from the coal sample supporting system 5 into the screen 202 of the screen frame 201; Step 3: Use the vibration system 6 to vibrate the screen frame 201, so that the coal samples with a particle size smaller than the aperture of the current screen 202 fall into the lower screen 202, and the coal samples with a particle size smaller than the bottom screen 202 fall into the bottom of the screen frame 201, and the coal samples remaining in each layer of the screen 202 are vibrated into the coal sample bag through the hollow tube 204 of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag is removed; Step 4: Use the spray cleaning system 3 to clean the inside of the screen frame 25. After the sewage is discharged from the hollow pipe 204, turn off the water pump 301.

[0033] Embodiment 2 The self-cleaning multi-particle size coal sample preparation device includes a screening system 2, and the screening system 2 includes a screen frame 201. The screen frame 201 includes a top cover 205, and the top cover 205 is hinged to the side wall of the screen frame 201. A discharge port 203 is provided on the top of the screen frame 201. A plurality of screens 202 which are parallel to each other and whose mesh apertures decrease layer by layer are sequentially arranged in the screen frame 201 along the discharge direction. The side wall of the screen frame 201 is connected to a plurality of hollow tubes 204 which are perpendicular to the discharge direction, and one of the hollow tubes 204 is against the upper side of the bottom of the screen frame 201, and the remaining hollow tubes 204 are arranged one by one with the screen 202 and against the upper side of the screen 202. The discharge port in the screen frame 201 A spray cleaning system 3, a coal sample crushing system 4, and a coal sample supporting system 5 are connected in sequence between 203 and the screen 202 with the largest mesh size along the feeding direction. The spray cleaning system 3 includes a spray head 303, and the spray head 303 is fixedly connected to the inner side of the top cover 205. The water inlet of the spray head 303 is connected to the water pipe 302, and the water pipe 302 is connected to the top cover 205. The end of the water pipe 302 away from the spray head 303 is connected to the water pump 301, and the water inlet end of the water pump is connected to the water inlet pipe 304. The coal sample supporting system 5 includes an opening and closing component 503, a vibration system 6 is connected to one side of the screen frame 201, and a spring 803 is fixedly connected to the outer side of the bottom of the screen frame 201.

[0034] The method for preparing a multi-particle size coal sample of the present invention uses a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Control the opening and closing assembly 503 to close, load the coal sample onto the top of the coal sample supporting system 5, and sleeve the coal sample bag onto one end of the hollow tube 204 outside the screen frame 201; Step 2: The coal sample is crushed by the coal sample crushing system 4. After the crushing is completed, the opening and closing component 503 is controlled to open, so that the coal sample falls from the coal sample supporting system 5 into the screen 202 of the screen frame 201; Step 3: Use the vibration system 6 to vibrate the screen frame 201, so that the coal samples with a particle size smaller than the aperture of the current screen 202 fall into the lower screen 202, and the coal samples with a particle size smaller than the bottom screen 202 fall into the bottom of the screen frame 201, and the coal samples remaining in each layer of the screen 202 are vibrated into the coal sample bag through the hollow tube 204 of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag is removed; Step 4: Start the water pump 301, water flows into the water pump 301 from the water inlet pipe 304, and then the water is pumped into the water pipe 302 by the water pump 301, and then the water flows out through the sprinkler head 303, and the inside of the screen frame 201 is cleaned by the water flow. After the sewage is discharged from the screening system 2 from the hollow tube 204, the water pump 301 is turned off.

[0035] Embodiment 3 The self-cleaning multi-particle size coal sample preparation device includes a screening system 2, which includes a screen frame 201, and the screen frame 201 includes a top cover 205, which is hinged to the side wall of the screen frame 201. A feeding port 203 is provided on the top of the screen frame 201. A plurality of screens 202 which are parallel to each other and whose mesh apertures decrease layer by layer are sequentially arranged in the screen frame 201 along the feeding direction. The side wall of the screen frame 201 is connected to a plurality of hollow tubes 204 which are perpendicular to the feeding direction, one of which is against the upper side of the bottom of the screen frame 201, and the other hollow tubes 204 are one-to-one with the screens 202. A spray cleaning system 3, a coal sample crushing system 4, and a coal sample supporting system 5 are sequentially connected between the feed opening 203 in the screen frame 201 and the screen 202 with the largest mesh size along the feed direction, and the spray cleaning system 3 includes a spray head 303, and the spray head 303 is fixed to the inner side of the top cover 205. The water inlet of the spray head 303 is connected to the water pipe 302, and the water pipe 302 is connected to the top cover 205. The end of the water pipe 302 away from the spray head 303 is connected to the water pump 301, and the water inlet end of the water pump is connected to the water inlet pipe 304.

[0036] The coal sample crushing system 4 includes a blade 401 located between the top cover 205 and the coal sample supporting system 5, the blade 401 is connected to the transmission shaft 403, the transmission shaft 403 includes a vertical shaft 4031 extending along the feeding direction, and also includes a horizontal shaft 4032 perpendicular to the feeding direction. The blade 401 is coaxially installed on the upper end of the vertical shaft 4031 along the feeding direction, and the lower end of the vertical shaft 4031 along the feeding direction is connected to the horizontal shaft 4032. The horizontal shaft 4032 is penetrated through the side wall of the screen frame 201, and the horizontal shaft 4032 is located between the coal sample supporting system 5 and the screen 202 with the largest mesh aperture. The end of the horizontal shaft 4032 away from the vertical shaft 4031 is connected to the motor 402. The coal sample supporting system 5 includes an opening and closing component 503, a vibration system 6 is connected to one side of the screen frame 201, and a spring 803 is fixed to the outer side of the bottom of the screen frame 201.

[0037] The method for preparing a multi-particle size coal sample of the present invention uses a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Control the opening and closing assembly 503 to close, load the coal sample onto the top of the coal sample supporting system 5, and sleeve the coal sample bag onto one end of the hollow tube 204 outside the screen frame 201; Step 2: Start the motor 402, the motor 402 drives the horizontal axis 4032 to move, the horizontal axis 4032 drives the vertical axis 4031 to move, the vertical axis 4031 drives the blade 401 to rotate, the blade 401 is used to crush the coal sample, and after the crushing process is completed, the opening and closing component 503 is controlled to open, so that the coal sample falls into the screen 202; Step 3: Use the vibration system 6 to vibrate the screen frame 201, so that the coal samples with a particle size smaller than the aperture of the current screen 202 fall into the lower screen 202, and the coal samples with a particle size smaller than the bottom screen 202 fall into the bottom of the screen frame 201, and the coal samples remaining in each layer of the screen 202 are vibrated into the coal sample bag through the hollow tube 204 of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag is removed; Step 4: Start the water pump 301, water flows into the water pump 301 from the water inlet pipe 304, and then the water is pumped into the water pipe 302 by the water pump 301, and then the water flows out through the sprinkler head 303, and the inside of the screen frame 201 is cleaned by the water flow. After the sewage is discharged from the screening system 2 from the hollow tube 204, the water pump 301 is turned off.

[0038] Embodiment 4 The self-cleaning multi-particle size coal sample preparation device includes a screening system 2, which includes a screen frame 201, and the screen frame 201 includes a top cover 205, which is hinged to the side wall of the screen frame 201. A feeding port 203 is provided on the top of the screen frame 201. A plurality of screens 202 which are parallel to each other and whose mesh apertures decrease layer by layer are sequentially arranged in the screen frame 201 along the feeding direction. The side wall of the screen frame 201 is connected to a plurality of hollow tubes 204 which are perpendicular to the feeding direction, one of which is against the upper side of the bottom of the screen frame 201, and the other hollow tubes 204 are one-to-one with the screens 202. A spray cleaning system 3, a coal sample crushing system 4, and a coal sample supporting system 5 are sequentially connected between the feed opening 203 in the screen frame 201 and the screen 202 with the largest mesh size along the feed direction, and the spray cleaning system 3 includes a spray head 303, and the spray head 303 is fixed to the inner side of the top cover 205. The water inlet of the spray head 303 is connected to the water pipe 302, and the water pipe 302 is connected to the top cover 205. The end of the water pipe 302 away from the spray head 303 is connected to the water pump 301, and the water inlet end of the water pump is connected to the water inlet pipe 304.

[0039] The coal sample crushing system 4 includes a blade 401 located between the top cover 205 and the coal sample supporting system 5, the blade 401 is connected to the transmission shaft 403, the transmission shaft 403 includes a vertical axis 4031 extending along the feeding direction, and also includes a horizontal axis 4032 perpendicular to the feeding direction. The blade 401 is coaxially installed on the upper end of the vertical axis 4031 along the feeding direction, and the lower end of the vertical axis 4031 along the feeding direction is connected to the horizontal axis 4032. The horizontal axis 4032 passes through the side wall of the screen frame 201, and the horizontal axis 4032 is located between the coal sample supporting system 5 and the screen 202 with the largest mesh aperture. The end of the horizontal axis 4032 away from the vertical axis 4031 is connected to the motor 402.

[0040] The coal sample supporting system 5 includes a tray 501, which is located between the crushing blade 401 and the screen 202 with the largest mesh size. The tray 501 is provided with a central through hole 502. The coal sample supporting system 5 includes an opening and closing component 503, which is connected to the through hole of the tray 501. The opening and closing component includes a plurality of groups of racks 5031 fixed to the tray 501, and the racks 5031 are provided with gears 5032 meshing with the racks 5031. The gears 5032 are fixed with rotating blades 5033. The middle part of the vertical axis 4031 of the transmission shaft 403 is transmission-connected to all the gears 5032. A vibration system 6 is connected to one side of the screen frame 201, and a spring 803 is fixed to the outer side of the bottom of the screen frame 201.

[0041] The method for preparing a multi-particle size coal sample of the present invention uses a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Control the opening and closing assembly 503 to close, load the coal sample onto the top of the coal sample supporting system 5, and sleeve the coal sample bag onto one end of the hollow tube 204 outside the screen frame 201; Step 2: Start the motor 402, the motor 402 rotates forward to drive the horizontal axis 4032 to move, the horizontal axis 4032 drives the vertical axis 4031 to move, the vertical axis 4031 drives the blade 401 to rotate, and the coal sample is crushed by the blade 401. After the crushing is completed, the motor 402 rotates reversely to drive the horizontal axis 4032 to move, the horizontal axis 4032 drives the vertical axis 4031 to move, the vertical axis 4031 drives the gear 5032 to rotate on the rack 5031, and the gear 5032 drives the rotating blade 5033 to rotate to the top of the tray 501, so that the coal sample falls into the screen 202; Step 3: Use the vibration system 6 to vibrate the screen frame 201, so that the coal samples with a particle size smaller than the aperture of the current screen 202 fall into the lower screen 202, and the coal samples with a particle size smaller than the bottom screen 202 fall into the bottom of the screen frame 201, and the coal samples remaining in each layer of the screen 202 are vibrated into the coal sample bag through the hollow tube 204 of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag is removed; Step 4: Start the water pump 301, water flows into the water pump 301 from the water inlet pipe 304, and then the water is pumped into the water pipe 302 by the water pump 301, and then the water flows out through the sprinkler head 303, and the inside of the screen frame 201 is cleaned by the water flow. After the sewage is discharged from the screening system 2 from the hollow tube 204, the water pump 301 is turned off.

[0042] Embodiment 5 The self-cleaning multi-particle size coal sample preparation device includes a screening system 2, which includes a screen frame 201. The screen frame 201 includes a top cover 205, which is hinged to the side wall of the screen frame 201. A feed port 203 is provided on the top of the screen frame 201. A plurality of sieves 202 which are parallel to each other and whose mesh apertures decrease layer by layer are arranged in sequence in the screen frame 201 along the feeding direction. The side wall of the screen frame 201 is connected to a plurality of hollow tubes 204 which are perpendicular to the feeding direction, one of which is against the upper side of the bottom of the screen frame 201, and the remaining hollow tubes 204 are arranged one by one corresponding to the sieves 202 and against the upper side of the sieves 202. The screening system 2 is provided with an outer shell 8, which is a cylindrical body. A switch door 801 is hinged on the side panel of the outer shell 8. A handle 802 for operating the switch door 801 is installed on the switch door 801. A counterweight block 804 is fixedly connected to the bottom of the inner side of the outer shell 8. There are three springs 803, and the three springs 803 are distributed in a regular triangle. The elastic direction of the three springs 803 is the feeding direction. One end of the spring 803 is fixedly connected to the counterweight block 804, and the other end is fixedly connected to the bottom of the screen frame 201. A water bucket 805 is provided in the outer shell 8, and the mouth of the water bucket 805 is located below the end of the hollow tube 204 outside the screen frame 201. A water outlet pipe 806 is penetrated through the bottom side wall of the water bucket 805, and the water outlet pipe 806 passes through the outer shell 8.

[0043] A spray cleaning system 3, a coal sample crushing system 4, and a coal sample supporting system 5 are connected in sequence between the discharge port 203 in the screen frame 201 and the screen 202 with the largest mesh size along the discharge direction. The spray cleaning system 3 includes a spray head 303, and the spray head 303 is fixed to the inner side of the top cover 205. The water inlet of the spray head 303 is connected to the water pipe 302, and the water pipe 302 is connected to the top cover 205. The end of the water pipe 302 away from the spray head 303 is connected to the water pump 301, and the water inlet end of the water pump is connected to the water inlet pipe 304.

[0044] The coal sample crushing system 4 includes a blade 401 located between the top cover 205 and the coal sample supporting system 5, the blade 401 is connected to the transmission shaft 403, the transmission shaft 403 includes a vertical axis 4031 extending along the feeding direction, and also includes a horizontal axis 4032 perpendicular to the feeding direction. The blade 401 is coaxially installed on the upper end of the vertical axis 4031 along the feeding direction, and the lower end of the vertical axis 4031 along the feeding direction is connected to the horizontal axis 4032. The horizontal axis 4032 passes through the side wall of the screen frame 201, and the horizontal axis 4032 is located between the coal sample supporting system 5 and the screen 202 with the largest mesh aperture. The end of the horizontal axis 4032 away from the vertical axis 4031 is connected to the motor 402.

[0045] The coal sample supporting system 5 includes a tray 501, which is located between the crushing blade 401 and the screen 202 with the largest mesh size. The tray 501 is provided with a central through hole 502. The coal sample supporting system 5 includes an opening and closing component 503, which is connected to the through hole of the tray 501. The opening and closing component includes a plurality of groups of racks 5031 fixed to the tray 501, and the racks 5031 are provided with gears 5032 meshing with the racks 5031. The gears 5032 are fixed with rotating blades 5033. The middle part of the vertical axis 4031 of the transmission shaft 403 is transmission-connected to all the gears 5032. A vibration system 6 is connected to one side of the screen frame 201, and a spring 803 is fixed to the outer side of the bottom of the screen frame 201.

[0046] The method for preparing a multi-particle size coal sample of the present invention uses a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Pull the handle 802 to open the switch door 801, lift the top cover 205 of the screen frame 201, control the opening and closing assembly 503 to close, load the coal sample onto the top of the coal sample supporting system 5, and put the coal sample bag on the end of the hollow tube 204 outside the screen frame 201; Step 2: Start the motor 402, the motor 402 rotates forward to drive the horizontal axis 4032 to move, the horizontal axis 4032 drives the vertical axis 4031 to move, the vertical axis 4031 drives the blade 401 to rotate, and the coal sample is crushed by the blade 401. After the crushing is completed, the motor 402 rotates reversely to drive the horizontal axis 4032 to move, the horizontal axis 4032 drives the vertical axis 4031 to move, the vertical axis 4031 drives the gear 5032 to rotate on the rack 5031, and the gear 5032 drives the rotating blade 5033 to rotate to the top of the tray 501, so that the coal sample falls into the screen 202; Step 3: Use the vibration system 6 to vibrate the screen frame 201, so that the coal samples with a particle size smaller than the aperture of the current screen 202 fall into the lower screen 202, and the coal samples with a particle size smaller than the bottom screen 202 fall into the bottom of the screen frame 201, and the coal samples remaining in each layer of the screen 202 are vibrated into the coal sample bag through the hollow tube 204 of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag is removed; Step 4: Start the water pump 301, water flows into the water pump 301 from the water inlet pipe 304, and then the water is pumped into the water pipe 302 by the water pump 301, and then the water flows out through the sprinkler head 303, and the inside of the screen frame 201 is cleaned by the water flow, and the sewage is discharged from the hollow tube 204 into the water bucket 805, and after being discharged through the water outlet pipe 806 connected to the water bucket 805, the water pump 301 is turned off.

[0047] Embodiment 6 The self-cleaning multi-size coal sample preparation device includes a screening system 2, the screening system 2 includes a screen frame 201, the screen frame 201 includes a top cover 205, the top cover 205 is hinged to the side wall of the screen frame 201, a lock 206 that matches the side wall of the screen frame 201 is provided on the side of the top cover 205 away from the hinge axis, a feed opening 203 is provided on the top of the screen frame 201, and three mutually parallel screens with mesh apertures decreasing layer by layer are sequentially arranged in the screen frame 201 along the feed direction 202, along the feeding direction are the first screen 2021, the second screen 2022, and the third screen 2023, the side wall of the screen frame 201 is connected to four hollow tubes 204 perpendicular to the feeding direction, one of which is against the upper side of the bottom of the screen frame 201, which is the fourth hollow tube 2044, and the three hollow tubes 204 are arranged one by one with the screen 202 and against the upper side of the screen 202, along the feeding direction are the first hollow tube 2021, the second screen 2022, and the third screen 2023, the side wall of the screen frame 201 is connected to four hollow tubes 204 perpendicular to the feeding direction, and one of the hollow tubes 204 is against the upper side of the bottom of the screen frame 201, which is the fourth hollow tube 2044, and the three hollow tubes 204 are arranged in a one-to-one correspond Tube 2041, the second hollow tube 2042, the third hollow tube 2043, the screening system 2 is provided with a double-layer shell 8, the double-layer structure is filled with sound insulation material, the shell 8 is a cylinder, and a roller 807 for convenient movement is provided at the bottom of the shell 8. A switch door 801 is hinged on the side panel of the shell 8, and a handle 802 for operating the switch door 801 is installed on the switch door 801. A counterweight block 804 is fixedly connected to the bottom of the inner side of the shell 8. There are four springs 803, and the four springs 803 are distributed in a square. The elastic direction of the four springs 803 is all in the feeding direction. One end of the spring 803 is fixedly connected to the counterweight block 804, and the other end is fixedly connected to the bottom of the screen frame 201. A water bucket 805 is provided in the shell 8, and the mouth of the water bucket 805 is located below the end of the hollow tube 204 outside the screen frame 201. A water outlet pipe 806 is penetrated through the bottom side wall of the water bucket 805, and the water outlet pipe 806 passes through the shell 8.

[0048] A spray cleaning system 3, a coal sample crushing system 4, and a coal sample supporting system 5 are connected in sequence between the discharge port 203 in the screen frame 201 and the screen 202 with the largest mesh size along the discharge direction. The spray cleaning system 3 includes a spray head 303, and the spray head 303 is fixed to the inner side of the top cover 205. The water inlet of the spray head 303 is connected to the water pipe 302, and the water pipe 302 is connected to the top cover 205. The end of the water pipe 302 away from the spray head 303 is connected to the water pump 301, and the water inlet end of the water pump is connected to the water inlet pipe 304.

[0049] The coal sample crushing system 4 includes a blade 401 located between the top cover 205 and the coal sample supporting system 5, the blade 401 is connected to the transmission shaft 403, the transmission shaft 403 includes a vertical axis 4031 extending along the feeding direction, and also includes a horizontal axis 4032 perpendicular to the feeding direction. The blade 401 is coaxially installed on the upper end of the vertical axis 4031 along the feeding direction, and the lower end of the vertical axis 4031 along the feeding direction is connected to the horizontal axis 4032. The horizontal axis 4032 passes through the side wall of the screen frame 201, and the horizontal axis 4032 is located between the coal sample supporting system 5 and the screen 202 with the largest mesh aperture. The end of the horizontal axis 4032 away from the vertical axis 4031 is connected to the motor 402.

[0050] The coal sample supporting system 5 includes a tray 501, which is located between the crushing blade 401 and the screen 202 with the largest mesh aperture. The tray 501 is provided with a central through hole 502. The coal sample supporting system 5 includes an opening and closing component 503, which is connected to the through hole of the tray 501. The opening and closing component includes six groups of racks 5031 fixed to the tray 501, and the racks 5031 are provided with gears 5032 meshing with the racks 5031. The gears 5032 are fixed with rotating blades 5033. The middle part of the vertical axis 4031 of the transmission shaft 403 is transmission-connected to all the gears 5032. One part of the screen frame 201 is connected to the racks 5031. The side is connected to a vibration system 6, the vibration system 6 includes an ultrasonic controller 601, the output end of the ultrasonic controller 601 is connected to three vibrators 602, the three vibrators 602 are respectively connected to the side walls of the sieve frame 201 corresponding to the sieve mesh 202, among which the first vibrator 6021 is connected to the side wall of the sieve frame 201 corresponding to the first sieve mesh 2021, the second vibrator 6022 is connected to the side wall of the sieve frame 201 corresponding to the second sieve mesh 2022, the third vibrator 6023 is connected to the side wall of the sieve frame 201 corresponding to the third sieve mesh 2023, and a spring 803 is fixed to the outer side of the bottom of the sieve frame 201.

[0051] An air blowing system 7 is connected between the tray 501 and the discharge port 203, and the air blowing system 7 includes a fan 701. The air outlet end of the fan 701 is connected to an air duct 702. The end of the air duct 702 away from the fan 701 is connected to the screen frame 201. The water pump 301, the motor 402, the ultrasonic controller 601, and the fan 701 are all electrically connected to the central control computer 1. The central control computer 1 includes a power supply, a display, and buttons.

[0052] The method for preparing a multi-particle size coal sample of the present invention uses a self-cleaning multi-particle size coal sample preparation device, and the specific steps are as follows: Step 1: Pull the handle 802 to open the switch door 801, lift the top cover 205 of the screen frame 201, control the motor 402 to reverse through the central control computer 1, and the motor 402 controls the rotating blades 5033 to close, and load the coal sample onto the top of the coal sample supporting system 5, and put the coal sample bag on the end of the hollow tube 204 outside the screen frame 201; Step 2: If the coal sample is a wet coal sample, the central control computer 1 starts the fan 701, sets the blowing time, and allows the fan 701 to air dry the wet coal sample through the air duct 702. After the set time is reached, the fan 701 is turned off; Step 3: start the motor 402 through the central control computer 1, the motor 402 rotates forward to drive the horizontal axis 4032 to move, the horizontal axis 4032 drives the vertical axis 4031 to move, the vertical axis 4031 drives the blade 401 to rotate, and the coal sample is crushed by the blade 401. After the crushing process is completed, the motor 402 reverses to drive the horizontal axis 4032 to move, the horizontal axis 4032 drives the vertical axis 4031 to move, the vertical axis 4031 drives the gear 5032 to rotate on the rack 5031, and the gear 5032 drives the rotating blade 5033 to rotate to the top of the tray 501, so that the coal sample falls into the screen 202; Step 4: Start the ultrasonic controller 601 through the central control computer 1, set the vibration time, and the ultrasonic controller 601 controls the first vibrator 6021, the second vibrator 6022, and the third vibrator 6023 to vibrate simultaneously. The coal sample particles with a diameter smaller than the mesh diameter of the current screen 202 fall into the lower screen 202 or the bottom of the screen frame 201. The coal sample particles with a diameter larger than the mesh diameter of the current screen 202 and smaller than the mesh diameter of the upper screen 202 are vibrated from the end of the hollow tube 204 of the current layer outside the screen frame 25 to the sampling bag under the action of the vibrator. After the set vibration time is reached, turn off the ultrasonic controller 601 and remove the sampling bag. Step 5: Start the water pump 301 through the central control computer 1, and the water flows into the water pump 301 from the water inlet pipe 304. Then the water is pumped into the water pipe 302 by the water pump 301, and then the water flows out through the sprinkler head 303. The inside of the screen frame 201 is cleaned by the water flow, and the sewage is discharged from the hollow tube 204 into the water bucket 805. After being discharged through the outlet pipe 806 connected to the water bucket 805, the water pump 301 is turned off.

[0053] Step 6: Start the fan 701 through the central control computer 1, set the blowing time, and send air to the screen frame 201. After the blowing time reaches the set time, the fan 701 stops working.

Claims

1. A self-cleaning multi-size coal sample preparation device, characterized in that: The invention comprises a screening system (2), wherein the screening system (2) comprises a screen frame (201), a feeding port (203) is provided at the top of the screen frame (201), a plurality of screens (202) are arranged in sequence along the feeding direction and are parallel to each other and have mesh apertures that decrease layer by layer, and a side wall of the screen frame (201) is connected to a plurality of hollow tubes (204) that are perpendicular to the feeding direction, wherein one of the hollow tubes (204) is against the upper side of the bottom of the screen frame (201), and the remaining hollow tubes (204) are in contact with the screens (202). 02) are arranged in one-to-one correspondence and abut against the upper side of the screen (202), and a spray cleaning system (3), a coal sample crushing system (4), and a coal sample supporting system (5) are connected in sequence along the feeding direction between the feeding port (203) in the screen frame (201) and the screen (202) with the largest mesh aperture, and the coal sample supporting system (5) includes an opening and closing component (503), a vibration system (6) is connected to one side of the screen frame (201), and a spring (803) is fixed to the outer side of the bottom of the screen frame (201).

2. The self-cleaning multi-particle size coal sample preparation device according to claim 1, characterized in that: The screen frame (201) comprises a top cover (205), the top cover (205) is hinged to the side wall of the screen frame (201), the spray cleaning system (3) comprises a spray head (303), the spray head (303) is fixed to the inner side of the top cover (205), the water inlet of the spray head (303) is connected to a water pipe (302), the water pipe (302) is connected to the top cover (205), and one end of the water pipe (302) away from the spray head (303) is connected to a water pump (301).

3. The self-cleaning multi-particle size coal sample preparation device according to claim 2, characterized in that: The coal sample crushing system (4) comprises a blade (401) located between the top cover (205) and the coal sample supporting system (5); the blade (401) is in driving connection with a transmission shaft (403); the transmission shaft (403) comprises a vertical shaft (4031) extending along a feeding direction, and a horizontal shaft (4032) perpendicular to the feeding direction; the blade (401) is located at an upper end of the vertical shaft (4031) along the feeding direction; the lower end of the vertical shaft (4031) along the feeding direction is in driving connection with the horizontal shaft (4032); the horizontal shaft (4032) penetrates a side wall of the screen frame (201); the horizontal shaft (4032) is located between the coal sample supporting system (5) and a screen (202) having the largest mesh aperture; and the end of the horizontal shaft (4032) away from the vertical shaft (4031) is in driving connection with a motor (402).

4. The self-cleaning multi-particle size coal sample preparation device according to claim 3, characterized in that: The coal sample supporting system (5) comprises a tray (501), wherein the tray (501) is located between a blade (401) and a sieve (202) having the largest mesh aperture, wherein the tray (501) is provided with a central through hole (502), wherein the opening and closing assembly (503) is connected to the through hole of the tray (501), wherein the opening and closing assembly comprises a plurality of groups of racks (5031) fixedly connected to the tray (501), wherein the racks (5031) are provided with gears (5032) meshing with the racks (5031), wherein the gears (5032) are fixedly connected with rotating blades (5033), and wherein the middle portion of the vertical axis (4031) of the transmission shaft (403) is transmission-connected to all the gears (5032).

5. The self-cleaning multi-particle size coal sample preparation device according to claim 4, characterized in that: The screening system (2) is provided with a shell (8) outside, and a switch door (801) is installed on the side wall of the shell (8). A counterweight block (804) is fixedly connected to the bottom of the inner side of the shell (8). There are a plurality of springs (803), and the elastic force direction of the plurality of springs (803) is the material discharge direction. One end of the spring (803) is fixedly connected to the counterweight block (804), and the other end is fixedly connected to the bottom of the screen frame (201). A water bucket (805) is provided inside the shell (8), and the mouth of the water bucket (805) is located below the end of the hollow tube (204) located outside the screen frame (201). A water outlet pipe (806) is penetrated through the side wall of the bottom of the water bucket (805), and the water outlet pipe (806) penetrates out of the shell (8).

6. The self-cleaning multi-particle size coal sample preparation device according to claim 5, characterized in that: An air blowing system (7) is connected between the tray (501) and the discharge port (203), wherein the air blowing system (7) comprises a fan (701), an air outlet end of the fan (701) is connected to an air duct (702), and an end of the air duct (702) away from the fan (701) is connected to the screen frame (201).

7. The self-cleaning multi-particle size coal sample preparation device according to claim 6, characterized in that: The water pump (301), the motor (402), the ultrasonic controller (601), and the fan (701) are all electrically connected to a central control computer (1), and the central control computer (1) includes a power supply, a display, and buttons.

8. A method for preparing coal samples with multiple particle sizes, characterized in that: Using the self-cleaning multi-particle size coal sample preparation device according to claim 7, the specific steps are as follows: Step 1: Control the opening and closing assembly (503) to close, load the coal sample onto the top of the coal sample supporting system (5), and sleeve the coal sample bag onto one end of the hollow tube (204) located outside the screen frame (201); Step 2: The coal sample is crushed by the coal sample crushing system (4). After the crushing is completed, the opening and closing component (503) is controlled to open, so that the coal sample falls from the coal sample supporting system (5) into the screen (202) of the screen frame (201); Step 3: Use the vibration system (6) to vibrate the screen frame (201), so that the coal samples with a particle size smaller than the aperture of the current screen (202) fall into the lower screen (202), and the coal samples with a particle size smaller than the bottom screen (202) fall into the bottom of the screen frame (201), and the coal samples remaining in each layer of the screen (202) are vibrated into the coal sample bag through the hollow tube (204) of the current layer. After all the coal samples are vibrated into the coal sample bag, the coal sample bag is removed; Step 4: Use the spray cleaning system (3) to clean the inside of the screen frame (201). After the sewage is discharged from the hollow pipe (204), turn off the water pump (301).

9. The method for preparing multi-size coal samples according to claim 8, characterized in that: After the coal sample is loaded and before the coal sample is crushed, if the coal sample is a wet coal sample, the fan (701) is turned on, and the fan (701) supplies air to the screen frame (201) through the air duct (702).

10. The method for preparing coal samples with multiple particle sizes according to claim 9, characterized in that: After the water pump (301) is turned off, the fan (701) is turned on, and the fan (701) supplies air to the screen frame (201) through the air duct (702).

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