Automatic grinding device for analyzing coal sample and preparation process

Abstract

The application provides an automatic coal sample grinding device and a preparation process. The automatic coal sample grinding device comprises a shell, a vibrating mechanism, a grinding mechanism, a blowing mechanism, a dust removal mechanism and a central controller. After raw coal samples are put into the grinding mechanism, the analysis coal samples are prepared under the driving of the vibrating mechanism. The blowing mechanism and the dust removal mechanism clean the grinding mechanism after the analysis coal samples are obtained. Through the cleaning and capturing of the blowing mechanism and the dust removal mechanism, the waste dust generated in the preparation of the analysis coal samples is recycled in an environmentally friendly manner. The whole process of grinding and cleaning is automatically carried out under the coordination of the central controller without manual intervention.

Description

Technical Field

[0001] This invention relates to the field of grinding devices, and in particular to an automatic coal sample grinding device and preparation process. Background Technology

[0002] Analytical coal samples refer to micron-sized particles with uniform particle size prepared from raw coal through processes such as crushing and grinding. Fine grinding of raw coal samples aims to obtain a well-mixed particle system with a concentrated particle size distribution, thereby ensuring the accuracy and reliability of subsequent experimental data. Generally, depending on the specific experimental purpose, the particle size range of analytical coal samples is usually controlled between 50 and 200 μm.

[0003] Currently, the grinding equipment commonly used in laboratory research mainly includes planetary ball mills and vibratory mills. Although these two types of devices can meet the fineness requirements of the samples needed for research, they still have many shortcomings in practical applications. Planetary ball mills, limited by their working principle, have a low single-pass capacity, and when changing samples, the grinding balls and chambers must be thoroughly cleaned after the equipment is completely shut down, making the operation cumbersome and time-consuming. While vibratory mills improve sample throughput to some extent, their cleaning process still mainly relies on manual labor, and there is a significant powder diffusion problem during sample collection and equipment cleaning, which not only poses a potential threat to the health of operators but may also cause environmental pollution. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic coal sample grinding device and preparation process to solve the problems mentioned above.

[0005] The technical solution adopted in this invention is as follows:

[0006] In a first aspect, the present invention provides an automatic coal sample grinding device, comprising a housing, a vibration mechanism, a grinding mechanism, a purging mechanism, a dust removal mechanism, and a central controller; a support plate is provided inside the housing;

[0007] The vibration mechanism includes a vibration table, springs, a vibrator, and a main drive motor; the vibration table includes an upper circular plate, a lower circular plate, and a main drive motor; the upper circular plate is connected to the lower circular plate by four support columns, and the two are parallel to each other; the center of the upper circular plate is provided with a through hole, and the bottom of the lower circular plate is connected to a support plate inside the housing by four springs; a vibrator is installed at the center of the bottom of the lower circular plate, and the vibrator is connected to the main drive motor;

[0008] A sample outlet hopper is installed between the upper and lower circular plates; the sample outlet hopper is fixed below the upper circular plate by a trapezoidal bracket;

[0009] The grinding mechanism includes a grinding cylinder, a grinding block, an upper cover plate, a lower cover plate, and an electromagnetic chuck. The grinding block is located inside the grinding cylinder, and the upper cover plate, grinding cylinder, and lower cover plate form a closed space. The grinding mechanism is mounted on a vibration table. The electromagnetic chuck, upper cover plate, and lower cover plate are respectively connected to three sets of rotating components on an upper circular plate to achieve their respective rotation and lifting. The rotating components connected to the electromagnetic chuck and upper cover plate are located above the upper circular plate, and the rotating components connected to the lower cover plate are located below the upper circular plate. In the closed space, under the centrifugal force provided by the vibration mechanism, the grinding block continuously impacts, squeezes, and cuts the raw coal sample, grinding the raw coal sample to the fineness required for analysis.

[0010] The purging mechanism includes an air compressor and a high-pressure nozzle; the air compressor is connected to the high-pressure nozzle via a gas delivery pipe; a delivery control valve is installed on the gas delivery pipe; the high-pressure nozzle is fixed to a nozzle base on the top of the housing;

[0011] The dust removal mechanism includes a dust suction port, an air inlet pipe, a dust removal chamber, an air outlet pipe, and a dust removal fan. The dust suction port is closely attached to the periphery of the support plate inside the housing. The dust suction port is connected to the dust removal chamber through the air inlet pipe. The dust removal chamber is connected to the dust removal fan through the air outlet pipe.

[0012] The central controller is used to monitor and control the operating status of each electrical connection component.

[0013] As a preferred embodiment of the automatic coal sample grinding device described in this invention: the top of the shell is provided with an openable sample feeding cover and a sample inlet hopper with an upper and lower circular shape; a contact switch is provided at the closing point of the sample feeding cover and the sample inlet hopper; the lower diameter of the sample inlet hopper is smaller than the diameter of the grinding cylinder; the top of the inner side of the shell is provided with a nozzle base for fixing a high-pressure nozzle and a gas pipe fixing seat for fixing a gas delivery pipe.

[0014] As a preferred embodiment of the automatic coal sample grinding device of the present invention: the shell includes a sample collection chamber and a dust collection chamber; a rectangular window is opened on the middle side wall of the shell, and a support bracket is provided inside the window for placing the sample collection chamber; a distance sensor is provided at the end of the support bracket; a rectangular window is also opened on the lower side wall of the shell for the access channel of the dust collection chamber; a left partition and a right partition are provided at the bottom of the shell, dividing the bottom of the shell into three independent spaces, and multiple ventilation holes are opened on the side wall of the shell; the sample collection chamber is located below the sample outlet hopper and is used to collect and analyze coal samples; the dust collection chamber is placed in the dust removal chamber and is used to collect various fine particles in the dust removal chamber.

[0015] As a preferred embodiment of the automatic coal sample grinding device described in this invention: the sample outlet hopper is a frustum-shaped hollow cylinder that is larger at the top and smaller at the bottom; the upper diameter of the sample outlet hopper is larger than the inner diameter of the grinding cylinder.

[0016] As a preferred embodiment of the automatic coal sample grinding device described in this invention: the three sets of rotating components include a rotating shaft, an electro-hydraulic actuator, a support arm, and a servo motor; the rotating shaft is longitudinally fixed to the upper circular plate through a bearing; one end of the rotating shaft is provided with a gear that meshes perpendicularly with a gear mounted on the servo motor, thereby realizing the rotation of the rotating shaft driven by the servo motor; the support arm is connected to the rotating shaft by a triangular hinge through the electro-hydraulic actuator; the ends of the support arms on the three sets of rotating components are respectively fixedly connected to an upper cover plate, a lower cover plate, and an electromagnetic chuck; the position of the support arm can be changed by adjusting the length of the electro-hydraulic actuator.

[0017] As a preferred embodiment of the automatic coal sample grinding device of the present invention: the center of the upper circular plate is configured with a through hole diameter consistent with the inner wall diameter of the grinding cylinder; four support columns longitudinally penetrate the upper and lower circular plates and are close to the edges of the upper and lower circular plates; a bearing seat is provided at the lower center of the lower circular plate, and the main shaft of the vibrator is embedded in the bearing seat; the vibrator is connected to the main drive motor through a coupling to compensate for vibration displacement and increase buffer protection; the main drive motor is connected and fixed to the left and right partition plates.

[0018] As a preferred embodiment of the automatic coal sample grinding device described in this invention: the conveying control valve automatically opens or closes the gas channel under the control of the central controller; the central controller instructs the air compressor to start working after the pressure in the air compressor cylinder is lower than a certain threshold; the end of the gas conveying pipe is connected to a high-pressure nozzle via a flexible hose to ensure flexible adjustment of the high-pressure nozzle angle; the purging mechanism utilizes the kinetic energy of the high-pressure gas itself to adjust the high-speed gas to a specific area through the high-pressure nozzle to achieve purging.

[0019] As a preferred embodiment of the automatic coal sample grinding device described in this invention: a filter element is provided in the dust removal chamber, and the filter element is fixed at the inlet of the air outlet pipe in the dust removal chamber; a secondary filter element is installed at the end of the dust removal fan to prevent the mixing of escaped particles; the dust removal mechanism utilizes the high-speed rotation of the dust removal fan to form a negative pressure at the dust suction port, which carries away various fine particles in the space above the shell support plate, thereby achieving dust removal.

[0020] As a preferred embodiment of the automatic coal sample grinding device described in this invention: the central controller is used to control the opening and closing of the main drive motor, dust removal fan, air compressor and conveying control valve, the forward and reverse operation of the servo motor, and the trigger status monitoring of the distance sensor and contact switch, thereby ensuring the automatic operation of grinding and cleaning.

[0021] Secondly, the present invention provides a process for preparing an automatic coal sample grinding device, comprising the following steps:

[0022] S1. After the raw coal sample is put into the sample feeding hopper and the sample feeding cover is closed, the contact switch is triggered and the central controller receives the signal.

[0023] S2. The central controller sends a signal, and the electromagnetic chuck and the upper cover plate are reset to the top of the grinding cylinder under the drive of their respective servo motors. The electro-hydraulic push rods attached to the upper and lower cover plates apply pressure to the grinding cylinder. The main drive motor drives the vibration table to drive the grinding cylinder and grinding blocks to make centrifugal motion. The raw coal sample is continuously ground under the impact, extrusion and cutting of the grinding cylinder and grinding blocks.

[0024] S3. Grinding ends. The central controller sends a signal, the main drive motor stops rotating, the upper cover plate rotates to the side under the drive of the servo motor, the electromagnetic chuck adsorbs the grinding block, detaches it from the grinding cylinder and rotates to the side, the lower cover plate rotates to the side under the drive of the servo motor, and the coal sample is introduced into the sample collection chamber through the sample outlet hopper.

[0025] S4. After sampling, the sample collection chamber is reset, the distance sensor is triggered, and the central controller receives a signal; the central controller sends a signal to open the delivery control valve, the high-pressure nozzle sprays high-pressure gas, and the dust removal fan starts to work at the same time.

[0026] S5. The central controller sends a signal again, the servo motor drives the lower cover plate to reset, the servo motor drives the electromagnetic chuck to reset and the magnetic force is released, the grinding block is reset to the grinding cylinder, the electromagnetic chuck rotates to the side under the drive of the servo motor, the upper cover plate is reset under the drive of the servo motor and then the upper cover plate moves back and forth multiple times with the electro-hydraulic push rod.

[0027] S6, the central controller sends a signal; the electro-hydraulic actuator of the upper cover plate stops moving and resets to the side, the conveying control valve closes, the high-pressure nozzle stops spraying high-pressure gas, and the dust removal fan continues to work for a period of time before stopping; waiting for the next coal sample grinding analysis.

[0028] The beneficial technical effects of this invention are as follows: This invention provides an automatic coal sample grinding device and preparation process. The automatic grinding device includes a shell, a vibration mechanism, a grinding mechanism, a purging mechanism, a dust removal mechanism, and a central controller. After the raw coal sample is fed into the grinding mechanism, it is used to prepare the analytical coal sample under the drive of the vibration mechanism. The purging mechanism and the dust removal mechanism clean the grinding mechanism after the analytical coal sample is obtained. Through the cleaning and collection by the purging mechanism and the dust removal mechanism, the waste dust generated in the preparation of the analytical coal sample is environmentally recycled. The entire grinding and cleaning process does not require manual intervention and is carried out automatically under the coordination of the central controller. Attached Figure Description

[0029] Figure 1 The image shown is an overall view of the automatic grinding device of the present invention;

[0030] Figure 2 The present invention is shown. Figure 1 A magnified view of a portion of point A in the middle;

[0031] Figure 3 The figure shown is a three-dimensional structural diagram of the upper inner side of the housing in the automatic grinding device of the present invention;

[0032] Figure 4 The figure shown is a three-dimensional structural diagram of the lower inner side of the housing in the automatic grinding device of the present invention;

[0033] Figure 5 The diagram shown is a three-dimensional representation of the automatic grinding device of the present invention with the housing removed. Figure 1 ;

[0034] Figure 6 The diagram shown is a three-dimensional representation of the automatic grinding device of the present invention with the housing removed. Figure 2 ;

[0035] Figure 7 The figure shown is a three-dimensional structural schematic diagram of the vibration mechanism in the automatic grinding device of the present invention;

[0036] Figure 8 The figure shown is a three-dimensional structural diagram of the grinding mechanism and the vibrating table in the automatic grinding device of the present invention.

[0037] Figure 9 The figure shown is a front view schematic diagram of the grinding mechanism in the automatic grinding device of the present invention;

[0038] Figure 10 The diagram shown is a top view of the grinding mechanism in the automatic grinding device of the present invention.

[0039] Figure 11 The figure shown is a three-dimensional structural diagram of the purging mechanism in the automatic grinding device of the present invention;

[0040] Figure 12 The figure shown is a three-dimensional structural diagram of the dust removal mechanism in the automatic grinding device of the present invention.

[0041] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Sample inlet cover; 12. Sample inlet hopper; 13. Contact switch; 14. Nozzle base; 15. Air pipe fixing seat; 16. Lifting bracket; 17. Sample collection chamber; 18. Distance sensor; 19. Support plate; 110. Waste dust collection chamber; 111. Vent; 112. Left partition; 113. Right partition; 2. Vibration mechanism; 2. Vibration table; 21. Upper circular plate; 22. Sample outlet hopper; 23. Trapezoidal bracket; 24. Lower circular plate; 25. Support column; 26. Spring; 27. Bearing seat; 28. Vibrator; 29. ​​Coupling; 210. Main drive motor; 211. Grinding... Grinding mechanism 3, grinding cylinder 31, grinding block 32, upper cover plate 33, lower cover plate 34, electromagnetic chuck 35, rotating component 36, rotating shaft 361, electro-hydraulic actuator 362, support arm 363, servo motor 364, bearing 365, gear 366; blowing mechanism 4, air compressor 41, conveying control valve 42, gas conveying pipe 43, hose 44, high-pressure nozzle 45; dust removal mechanism 5, dust suction port 51, air inlet pipe 52, dust removal chamber 53, filter element 54, air outlet pipe 55, dust removal fan 56, secondary filter element 57; central controller 6. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "center", "longitudinal", "positive direction", "opposite direction", "up", "down", "front", "back", "left", "right", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected," "linked," "connected," and "associated" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] This invention first provides an automatic coal sample grinding device, see [link to relevant documentation]. Figure 1 The image shown is an overall view of the automatic grinding device of the present invention. Figure 5 The diagram shown is a three-dimensional structural schematic of the automatic grinding device of the present invention with the housing removed. The automatic grinding device of the present invention includes a housing 1, a vibration mechanism 2, a grinding mechanism 3, a blowing mechanism 4, a dust removal mechanism 5, and a central controller 6.

[0046] like Figure 5 As shown, after the raw coal sample is put into the grinding mechanism 3, it is used to prepare the analytical coal sample under the drive of the vibration mechanism 2; the purging mechanism 4 and the dust removal mechanism 5 clean the grinding mechanism 3 after the analytical coal sample is obtained; through the cleaning and collection of the purging mechanism 4 and the dust removal mechanism 5, the waste dust generated in the preparation of the analytical coal sample is recycled in an environmentally friendly manner; the entire grinding and cleaning process does not require manual intervention and is carried out automatically under the coordination of the central controller 6; the specific structure of each functional unit is described in detail below.

[0047] like Figure 1 As shown, in one specific embodiment of the present invention, the top of the housing 1 is provided with an openable feeding cover 11 and a sample inlet 12 with a top and bottom circle. The rear end of the feeding cover 11 is connected to the housing 1, the upper edge of the sample inlet 12 is connected to the housing 1, and the lower edge diameter of the sample inlet 12 is slightly smaller than the diameter of the grinding cylinder. The central controller 6 is located at the lower right corner of the top of the housing 1. The sample collection chamber 17 is located at the opening in the middle of the housing 1, and the waste dust collection chamber 110 is located at the lower left corner of the bottom of the housing 1.

[0048] like Figure 2 As shown, a contact switch 13 is set at the middle position of the sampling cover plate 11 and the top of the shell 1 to send the status of whether the raw coal sample placement is finished to the central controller 6.

[0049] like Figure 3 As shown, four nozzle supports 14 and four air pipe fixing seats 15 are provided on the top of the inner side of the housing 1; a lifting bracket 16 is provided in the middle of the inner side of the housing, and a distance sensor 18 is provided at the end of the lifting bracket 16. The distance sensor 18 can send the status of whether the sample recovery chamber 17 is accurately reset to the state inside the equipment to the central controller 6; the sample recovery chamber 17 is located below the sample outlet hopper 23 and is used to collect and analyze coal samples.

[0050] like Figure 4 As shown, a left partition 112 and a right partition 113 are provided at the bottom of the housing 1 to divide the lower space of the housing 1 into three independent spaces, and multiple ventilation holes 111 are opened at the rear of the housing 1.

[0051] Furthermore, such as Figure 4 , Figure 7 and Figure 9As shown, in one specific embodiment of the present invention, the vibration table 21 connects the upper circular plate 22 and the lower circular plate 25 through four support columns 26; a hollow space with the same diameter as the inner wall of the grinding cylinder 31 is left at the center of the upper circular plate 22; the bottom of the lower circular plate 25 is connected to the support plate 19 through four springs 27; a bearing seat 28 is installed at the center of the bottom of the lower circular plate 25; the upper end of the main shaft of the vibrator 29 is installed on the bearing seat 28; the lower end of the main shaft of the vibrator 29 is connected to the main drive motor 211 through a coupling 210; the base of the main drive motor 211 is connected to the left partition 112 and the right partition 113 respectively.

[0052] An inclined, frustum-shaped sample outlet hopper 23, wider at the top and narrower at the bottom, is set between the upper circular plate 22 and the lower circular plate 25. The sample outlet hopper 23 is fixed to the upper circular plate 22 by a trapezoidal bracket 24. The diameter of the upper edge of the sample outlet hopper 23 is slightly larger than the diameter of the inner wall of the grinding cylinder 31, and the lower edge of the sample outlet hopper 23 is smaller than the width of the sample collection chamber 17. The entire sample outlet hopper 23 has a certain slope, which facilitates the smooth introduction of the coal sample into the sample collection chamber 17 after grinding. The active drive motor 211 drives the vibrator 29 through the coupling 210. The vibrator 29 then drives the vibration table 21, causing the vibration table 21 to make centrifugal circular motion on the horizontal plane. The spring 27 connecting the lower circular plate 25 and the support plate 19 plays the role of elastic connection.

[0053] Furthermore, such as Figure 8 , Figure 9 and Figure 10 As shown, in one specific embodiment of the present invention, the grinding cylinder 31 is located at the center of the upper circular plate 22, forming a concentric cylinder with the hollow space reserved in the upper circular plate 22, and the grinding block 32 is located inside the grinding cylinder 31; the upper cover plate 33 and the lower cover plate 34 are located above and below the grinding cylinder 31 respectively; an electromagnetic chuck 35 is provided above the upper cover plate 33.

[0054] A set of rotating components 36 consists of a rotating shaft 361, an electro-hydraulic actuator 362, a support arm 363, and a servo motor 364. Specifically, the three rotating shafts 361 are respectively longitudinally fixed to bearings 365 on the upper circular plate 22. The three rotating shafts 361 are distributed in an equilateral triangle on the plane of the upper circular plate 22 to enhance the balance of the vibration table 21. The servo motor 364 meshes with the rotating shaft 361 through a set of vertical gears 366. The rotation angle is controlled by changing the number of rotations and the direction of rotation of the servo motor 364. The rotating shaft 361, the electro-hydraulic actuator 362, and the support arm 363 are connected in pairs. The vertical displacement of the fixed object at the end of the support arm can be controlled by changing the length of the electro-hydraulic actuator 362. The electromagnetic chuck 35, the upper cover plate 33, and the lower cover plate 34 are respectively connected to the three sets of rotating components 36.

[0055] After the raw coal sample is put into the grinding cylinder 31, the upper cover plate 33, the lower cover plate 34 and the grinding cylinder 31 form a closed space under the action of the rotating component 36. Under the drive of the vibration mechanism 2, the raw coal sample in the closed space is continuously ground by the grinding cylinder 31 and the grinding block 32. After grinding, the prepared analytical coal sample can flow into the sample collection chamber 17 under the guidance of the sample outlet hopper 23. The electromagnetic chuck 35 can also suck the grinding block 32 out of the grinding cylinder 31 when the device is cleaning, so as to thoroughly clean the grinding cylinder 31 and the grinding block 32.

[0056] Furthermore, such as Figure 11 As shown, in one specific embodiment of the present invention, the purging mechanism 4 consists of an air compressor 41, a delivery control valve 42, and a high-pressure nozzle 45 connected in series via a gas delivery pipe 43. The delivery control valve 42 is located near the cylinder outlet of the air compressor 41 and is controlled by a central controller 6, which can automatically open or close the gas passage. When the pressure inside the cylinder of the air compressor 41 is lower than a certain threshold, the central controller 6 commands the air compressor 41 to start working. The high-pressure nozzle 45 is fixed to the nozzle base 14 on the top of the housing. The end of the gas delivery pipe 43 is connected to the high-pressure nozzle 45 by a flexible hose 44 to ensure flexible adjustment of the angle of the high-pressure nozzle 45. The purging mechanism 4 utilizes the kinetic energy of the high-pressure gas itself to adjust the high-speed gas to a specific area through the high-pressure nozzle 45 to achieve the cleaning function.

[0057] Furthermore, such as Figure 12 As shown, in one specific embodiment of the present invention, the dust removal mechanism 5 includes a suction port 51, an air inlet pipe 52, a dust removal chamber 53, an air outlet pipe 55, and a dust removal fan 56. The suction port 51 is closely attached to the periphery of the support plate 19 in the middle of the housing 1. The suction port 51, the dust removal chamber 53, and the dust removal fan 56 are connected in series through the air inlet pipe 52 and the air outlet pipe 55. The dust removal chamber 53 includes a filter element 54, which is fixed to the inlet of the air outlet pipe 54 of the dust removal chamber 53. The end of the dust removal fan 56 is equipped with a secondary filter element 57 to prevent individual escaped particles from being mixed in. The dust removal mechanism 5 utilizes the high-speed rotation of the dust removal fan 56 to create a negative pressure at the suction port 51, carrying away various fine particles in the space above the support plate 19, thereby achieving the dust removal function. The waste dust collection bin 110 is used to collect various fine particles in the dust removal chamber 53.

[0058] Furthermore, such as Figure 5 , Figure 6 , Figure 8 and Figure 10As shown, in one specific embodiment of the present invention, the central controller 6 is composed of a programmable logic controller (PLC), which controls the opening and closing of the main drive motor 211, the dust removal fan 56, the air compressor 41 and the conveying control valve 42, the forward and reverse operation of the servo motor 364, and the triggering state of the distance sensor 18 and the contact switch 13, thereby ensuring the automatic execution of grinding and cleaning work; the central controller 6 also includes a display, on which corresponding instruction information is displayed to provide the operator with a basis for operation instructions.

[0059] Specifically, after the contact switch 13 is triggered, the central controller 6 receives the signal and instructs the servo motors 364 of the electromagnetic chuck 35 and the upper cover plate 33 to operate. After the electromagnetic chuck 35 and the upper cover plate 33 move to directly above the grinding cylinder 31, the controller instructs the electro-hydraulic push rods 362 attached to the upper cover plate 33 and the lower cover plate 34 to extend slightly and apply pressure to the grinding cylinder 31. Subsequently, the controller instructs the main drive motor 211 to operate. After the preset grinding time is reached, the controller instructs the main drive motor 211 to stop operating. Then, the controller instructs the electro-hydraulic push rods 362 attached to the upper cover plate 33 and the lower cover plate 34 to operate. The push rod 362 retracts slightly, releasing the pressure previously applied to the grinding cylinder 31; then, the servo motor 364 attached to the upper cover plate 33 is instructed to work in the opposite direction, rotating the upper cover plate 33 to the side; then, the electromagnetic chuck 35 is instructed to activate its magnetism, adsorbing the grinding block and detaching it from the grinding cylinder 31, and then the servo motor 364 attached to the electromagnetic chuck 35 is instructed to work in the opposite direction, rotating the electromagnetic chuck 35 to the side; then, the servo motor 364 attached to the lower cover plate 34 is instructed to work, rotating the lower cover plate 34 to the side; then, the central controller 6 prompts "Please sample"; distance sensor After 18 is triggered, the control valve 42 and the dust removal fan 56 are opened; then the servo motor 364 attached to the lower cover 34 is instructed to work in the reverse direction, and the lower cover 34 is reset to directly below the grinding cylinder 31; then the servo motor 364 attached to the electromagnetic chuck 35 is instructed to work in the forward direction, and the electromagnetic chuck 35 is reset to directly above the grinding cylinder 31; then the electromagnetic chuck 35 is instructed to demagnetize, and the grinding block 32 is reset inside the grinding cylinder 31; then the servo motor 364 attached to the electromagnetic chuck 35 is instructed to work in the reverse direction, and the electromagnetic chuck 35 is rotated to the side; then the upper cover is instructed to... When the servo motor 364 attached to plate 33 operates in the forward direction, the upper cover plate 33 returns to its position directly above the grinding cylinder 31. Then, the electro-hydraulic push rod 362 attached to the upper cover plate 33 is instructed to perform multiple extension and retraction movements, and the upper cover plate 33 returns to its state before the extension and retraction movements. Then, the servo motor 364 attached to the upper cover plate 33 is instructed to operate in the reverse direction, and the upper cover plate 33 returns to its side position. Then, the conveying control valve 42 is instructed to close, and the high-pressure nozzle 45 stops spraying high-pressure gas. Then, the dust removal fan 56 is instructed to close. Then, the display on the central controller 6 prompts "Please deliver the next set".

[0060] This invention further provides an automated grinding and preparation process for analytical coal samples, comprising the following steps:

[0061] S1. After the raw coal sample is put into the sample feeding hopper 12 and the sample feeding cover 11 is closed, the contact switch 13 is triggered and the central controller 6 receives the signal.

[0062] S2, the central controller 6 sends a signal; the electromagnetic chuck 35 and the upper cover plate 34 are reset to directly above the grinding cylinder 31 under the drive of their respective servo motors 364, the electro-hydraulic push rods 362 attached to the upper cover plate 33 and the lower cover plate 34 apply pressure to the grinding cylinder 31, the main drive motor 211 drives the vibration table 21 to drive the grinding cylinder 31 and the grinding block 32 to make centrifugal motion, and the raw coal sample is continuously ground under the impact, extrusion and cutting of the grinding cylinder 31 and the grinding block 32;

[0063] S3. Grinding ends, and the central controller 6 sends a signal; the main drive motor 211 stops rotating, the electro-hydraulic push rods 34 attached to the upper cover plate 33 and the lower cover plate 34 release pressure on the grinding cylinder 31, the upper cover plate 33 rotates to the side under the drive of the servo motor 364, the electromagnetic chuck 35 adsorbs the grinding block 32 and detaches it from the grinding cylinder 31 and rotates to the side, the lower cover plate 34 rotates to the side under the drive of the servo motor 364, and the analyzed coal sample is introduced into the sample collection chamber 17 through the sample outlet hopper 23; the display on the central controller 6 prompts "Please take a sample";

[0064] S4. After sampling, the sample collection chamber 17 is reset, the distance sensor 18 is triggered, and the central controller 6 receives the signal; the central controller 6 sends a signal, the delivery control valve 42 is opened, the high-pressure nozzle 45 sprays high-pressure gas, and the dust removal fan 56 starts to work at the same time.

[0065] S5, the central controller 6 sends a signal again; the servo motor 364 drives the lower cover plate 34 to reset, the servo motor 364 drives the electromagnetic chuck 35 to reset and the magnetic force is released, the grinding block 32 resets into the grinding cylinder 31, the electromagnetic chuck 35 rotates to the side under the drive of the servo motor 364, the upper cover plate 33 resets under the drive of the servo motor 364, and the upper cover plate 33 performs multiple extension and retraction movements with the electro-hydraulic push rod 362;

[0066] S6, the central controller 6 sends a signal; the electro-hydraulic push rod 362 of the upper cover plate 33 stops moving and resets to the side, the conveying control valve 42 closes, the high-pressure nozzle 45 stops spraying high-pressure gas, and the dust removal fan 56 continues to work for a period of time before stopping; the display on the central controller prompts "Please put the next group in".

[0067] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. An automatic coal sample grinding device, characterized in that: It includes a housing (1), a vibration mechanism (2), a grinding mechanism (3), a blowing mechanism (4), a dust removal mechanism (5), and a central controller (6); the housing (1) is provided with a support plate (19); The vibration mechanism (2) includes a vibration table (21), springs (27), an exciter (29), and a main drive motor (211); the vibration table (21) includes an upper circular plate (22), a lower circular plate (25), and a main drive motor (211); the upper circular plate (22) is connected to the lower circular plate (25) by four support columns (26), and the two are parallel to each other; the center of the upper circular plate (22) is set with a through hole, and the bottom of the lower circular plate (25) is connected to the support plate (19) inside the housing (1) by four springs (27); an exciter (29) is installed at the center of the bottom of the lower circular plate (25), and the exciter (29) is connected to the main drive motor (211); A sample dispensing hopper (23) is installed between the upper circular plate (22) and the lower circular plate (25); the sample dispensing hopper (23) is fixed below the upper circular plate (22) by a trapezoidal bracket (24); The grinding mechanism (3) includes a grinding cylinder (31), a grinding block (32), an upper cover plate (33), a lower cover plate (34), and an electromagnetic chuck (35); the grinding block (32) is located inside the grinding cylinder (31), and the upper cover plate (33), the grinding cylinder (31), and the lower cover plate (34) form a closed space; the grinding mechanism (3) is set on a vibration table (21); the electromagnetic chuck (35), the upper cover plate (33), and the lower cover plate (34) are respectively connected to three sets of rotating components (36) on the upper circular plate (22) to achieve their respective rotation and lifting; the rotating components (36) connected to the electromagnetic chuck (35) and the upper cover plate (33) are located above the upper circular plate (22); the rotating components (36) connected to the lower cover plate (34) are located below the upper circular plate (22); The three sets of rotating components (36) include a rotating shaft (361), an electro-hydraulic actuator (362), a support arm (363), and a servo motor (364); the rotating shaft (361) is longitudinally fixed to the upper circular plate (22) through a bearing (365); one end of the rotating shaft (361) is provided with a gear (366) that meshes perpendicularly with the gear installed on the servo motor (364), thereby realizing the rotation of the rotating shaft (361) driven by the servo motor (364); the support arm (363) is connected to the rotating shaft (361) by a triangular hinge through the electro-hydraulic actuator (362); the ends of the support arms (363) on the three sets of rotating components (36) are respectively fixedly connected to an upper cover plate (33), a lower cover plate (34), and an electromagnetic chuck (35); the position of the support arm (363) can be changed by adjusting the length of the electro-hydraulic actuator (362) up and down; In a closed space, the grinding block (32) continuously impacts, squeezes and cuts the raw coal sample under the centrifugal force provided by the vibration mechanism (2), so that the raw coal sample is ground to the fineness required for the analysis of the coal sample; The purging mechanism (4) includes an air compressor (41) and a high-pressure nozzle (45); the air compressor (41) is connected to the high-pressure nozzle (45) through a gas delivery pipe (43); a delivery control valve (42) is installed on the gas delivery pipe (43); the high-pressure nozzle (45) is fixed to the nozzle base (14) at the top of the housing (1); The dust removal mechanism (5) includes a dust suction port (51), an air inlet pipe (52), a dust removal chamber (53), an air outlet pipe (55), and a dust removal fan (56). The dust suction port (51) is close to the periphery of the support plate (19) inside the housing (1). The dust suction port (51) is connected to the dust removal chamber (53) through the air inlet pipe (52). The dust removal chamber (53) is connected to the dust removal fan (56) through the air outlet pipe (55). The central controller (6) is used to monitor and control the working status of each electrical connection component.

2. The automatic coal sample grinding device according to claim 1, characterized in that: The top of the housing (1) is provided with an openable sample feeding cover (11) and a sample inlet (12) with an upper and lower circle. The closing part of the sample feeding cover (11) and the sample inlet (12) is provided with a contact switch (13). The lower diameter of the sample inlet (12) is smaller than the diameter of the grinding cylinder (31). The top of the inner side of the housing (1) is provided with a nozzle base (14) for fixing the high pressure nozzle (45) and a gas pipe fixing seat (15) for fixing the gas delivery pipe (43).

3. The automatic coal sample grinding device according to claim 2, characterized in that: The housing (1) includes a sample collection chamber (17) and a dust collection chamber (110); a rectangular window is opened on the middle side wall of the housing (1), and a support bracket (16) is set inside it to place the sample collection chamber (17); a distance sensor (18) is provided at the end of the support bracket (16); a rectangular window is also opened on the lower side wall of the housing (1) for the access channel of the dust collection chamber (110); a left partition (112) and a right partition (113) are provided at the bottom of the housing (1); the bottom of the housing (1) is divided into three independent spaces, and multiple ventilation holes (111) are opened on the side wall of the housing (1); the sample collection chamber (17) is located below the sample hopper (23) and is used to collect and analyze coal samples; the dust collection chamber (110) is placed in the dust removal chamber (53) and is used to collect various fine particles in the dust removal chamber (53).

4. The automatic coal sample grinding device according to claim 3, characterized in that: The sample outlet (23) is a hollow truncated cone-shaped column that is larger at the top and smaller at the bottom; the upper diameter of the sample outlet (23) is larger than the inner diameter of the grinding cylinder (31).

5. The automatic coal sample grinding device according to claim 4, characterized in that: The upper circular plate (22) is configured with a through hole at its center, the diameter of which is the same as the inner wall diameter of the grinding cylinder (31). The four support columns (26) extend longitudinally through the upper circular plate (22) and the lower circular plate (25), and are close to the edges of the upper circular plate (22) and the lower circular plate (25). A bearing seat (28) is provided at the lower center of the lower circular plate (25), and the main shaft of the vibrator (29) is embedded in the bearing seat (28). The vibrator (29) is connected to the main drive motor (211) through a coupling (210) to compensate for vibration displacement and increase buffer protection. The main drive motor (211) is connected and fixed on the left partition (112) and the right partition (113).

6. The automatic coal sample grinding device according to claim 5, characterized in that: The delivery control valve (42) automatically opens or closes the gas passage under the control of the central controller (6); the central controller (6) instructs the air compressor (41) to start working after the pressure in the cylinder of the air compressor (41) is lower than a certain threshold; the end of the gas delivery pipe (43) is connected to the high-pressure nozzle (45) by a hose (44) to ensure flexible adjustment of the angle of the high-pressure nozzle (45); the purging mechanism (4) uses the kinetic energy of the high-pressure gas itself to adjust the high-speed gas to a specific area through the high-pressure nozzle (45) to achieve cleaning.

7. The automatic coal sample grinding device according to claim 6, characterized in that: The dust removal chamber (53) is equipped with a filter element (54), which is fixed at the inlet of the air outlet pipe (55) inside the dust removal chamber (53); a secondary filter element (57) is installed at the end of the dust removal fan (56) to prevent the mixing of escaped particles; the dust removal mechanism (5) uses the high-speed rotation of the dust removal fan (56) to form a negative pressure at the dust suction port (51), which carries away various fine particles in the space above the support plate (19) of the shell (1) to achieve dust removal.

8. The automatic coal sample grinding device according to claim 7, characterized in that: The central controller (6) is used to control the opening and closing of the main drive motor (211), dust removal fan (56), air compressor (41) and conveying control valve (42), the forward and reverse operation of the servo motor (364), and the trigger status monitoring of the distance sensor (18) and contact switch (13), thereby ensuring the automatic operation of grinding and cleaning.

9. A preparation process for an automatic coal sample grinding device as described in claim 8, characterized in that: Includes the following steps: S1. After the raw coal sample is put into the sample feeding hopper (12), the sample feeding cover (11) is closed. The contact switch (13) is triggered, and the central controller (6) receives the signal. S2, the central controller (6) sends a signal, the electromagnetic chuck (35) and the upper cover plate (33) are reset to the top of the grinding cylinder (31) under the drive of their respective servo motors (364), the electro-hydraulic push rods (362) attached to the upper cover plate (33) and the lower cover plate (34) apply pressure to the grinding cylinder (31), the main drive motor (211) drives the vibration table (21) to drive the grinding cylinder (31) and the grinding block (32) to make centrifugal motion, and the raw coal sample is continuously ground under the impact, extrusion and cutting of the grinding cylinder (31) and the grinding block (32); S3. Grinding ends. The central controller (6) sends a signal, the main drive motor (211) stops rotating, the upper cover plate (33) rotates to the side under the drive of the servo motor (364), the electromagnetic chuck (35) adsorbs the grinding block (32) and detaches it from the grinding cylinder (31) and rotates to the side, the lower cover plate (34) rotates to the side under the drive of the servo motor (364), and the coal sample is introduced into the sample collection chamber (17) through the sample outlet hopper (23). S4. After sampling, the sample collection chamber (17) is reset, the distance sensor (18) is triggered, and the central controller (6) receives the signal; the central controller (6) sends a signal, the delivery control valve (42) is opened, the high-pressure nozzle (45) sprays high-pressure gas, and the dust removal fan (56) starts to work at the same time. S5. The central controller (6) sends a signal again, and the servo motor (364) drives the lower cover plate (34) to reset. After the servo motor (364) drives the electromagnetic chuck (35) to reset, the magnetic force is released, the grinding block (32) is reset into the grinding cylinder (31), the electromagnetic chuck (35) rotates to the side under the drive of the servo motor (364), and after the upper cover plate (33) is reset under the drive of the servo motor (364), the upper cover plate (33) moves back and forth multiple times with the electro-hydraulic push rod (362). S6, the central controller (6) sends a signal; the electro-hydraulic push rod (362) of the upper cover plate (33) stops moving and resets to the side, the conveying control valve (42) closes, the high-pressure nozzle (45) stops spraying high-pressure gas, and the dust removal fan (56) continues to work for a period of time before stopping; waiting for the next coal sample to be analyzed and ground.

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