A magnetic transmission coal sample crushing-desorption integrated device and a testing method thereof

Abstract

The present application relates to the technical field of coal mine gas disaster prevention, and discloses a magnetic transmission coal sample crushing-desorption integrated device and a testing method thereof, which comprises a tank body assembly, including a crushing tank body and a tank upper cover arranged at the upper end of the crushing tank body, and a sealing assembly arranged between the crushing tank body and the tank upper cover. The present application adopts a tank sealing assembly cooperating with a magnetic coupling transmission structure, cancels the dynamic sealing mode of the traditional transmission shaft penetrating the tank body, realizes non-contact magnetic transmission by relying on the air gap isolation of the driving magnetic rotor and the driven magnetic rotor, completely eliminates the sealing wear and air leakage hidden trouble caused by the penetration of the shaft body, and simultaneously sets three floating bottom knives and impact discs to form an elastic avoidance structure, which can automatically float and avoid obstacles when encountering large particle hard coal blocks, and the spring resets and locks after the coal block is crushed to continue operation, thereby solving the problems of easy jamming, collapse and motor overload damage of the traditional rigid cutter, and improving the uniformity of coal sample crushing and the fullness of gas desorption.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas disaster prevention and control technology, and in particular to a magnetically driven coal sample crushing-desorption integrated device and its testing method. Background Technology

[0002] In the field of coal mine safety production, the accurate determination of gas content in coal samples is the core prerequisite for preventing gas disasters and ensuring mine operation safety. It is also the key basic data for coal mine ventilation management, gas extraction design, and coal and gas outburst risk assessment. As the core link in gas content determination, the sealing, continuity, and safety of the coal sample crushing-desorption integrated operation directly determine the accuracy and reliability of gas desorption data, thereby affecting the scientific nature of subsequent safety decisions.

[0003] Currently, most existing integrated coal sample crushing-desorption devices adopt a traditional through-type dynamic sealing transmission structure. The motor drive shaft directly penetrates the side wall of the tank and extends into the cavity, where it is rigidly connected to the internal crushing blades. Dynamic sealing of rotating parts is achieved by oil seals or mechanical seals. However, the equipment operates under complex conditions of continuous vibration, coal dust erosion, and reciprocating friction of the shaft. The seals are prone to wear and aging, and the sealing gap increases, leading to failure of the dynamic sealing structure. This results in decreased tank airtightness and gas leakage. Gas escape not only causes the loss of desorbed gas from the coal sample, but also leads to distortion of gas detection data and reduced detection accuracy. While reducing the risk of gas spillage, there is also the potential for safety accidents. In addition, because the crushing blades of traditional crushing mechanisms are rigidly connected to the motor drive shaft, and the actual coal samples tested have complex compositions and large differences in hardness, hard coal blocks, gangue and other hard impurities are easily mixed in during the crushing process. When the rigid blades are hit by hard objects, they are prone to jamming and stuck, which leads to a sudden increase in transmission load, motor overload and burnout, and damage to transmission components. As a result, the existing equipment has a high failure rate, poor operational stability and short service life, and cannot meet the high precision, high stability and high safety requirements of coal mine coal sample testing operations. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a magnetically driven coal sample crushing-desorption integrated device and its testing method, thereby resolving the technical issues of gas leakage and easy jamming during the crushing process in existing crushing and desorption devices.

[0005] This invention provides an integrated magnetically driven coal sample crushing-desorption device, comprising: The tank assembly includes a crushing tank and a tank cover disposed at the upper end of the crushing tank, and a sealing assembly is provided between the crushing tank and the tank cover; The transmission mechanism includes a motor located outside the tank cover. The output end of the motor is fixedly connected to an active magnetic rotor via a transmission shaft. A driven magnetic rotor is provided on one side of the active magnetic rotor. One end of the driven magnetic rotor is fixedly connected to a driven magnetic rotor fixed shaft installed at the bottom of the tank cover via a first bearing, and the other end is fixedly connected to a driven magnetic rotor fixed rod installed on the tank cover via a second bearing, forming a double-end bearing support structure. The crushing mechanism includes a cutter column placed inside the crushing tank and a cutter assembly mounted on the cutter column. The cutter assembly includes a three-stage floating bottom cutter mounted on the bottom of the cutter column via an impact disc. The impact disc includes: A bottom cutter head is mounted on the cutter column, and an upper limit platform and a lower limit platform are fixedly connected to both ends of the bottom cutter head; Two guide grooves are symmetrically arranged on the bottom cutter head and located between the upper limit platform and the lower limit platform. A guide fixing seat is slidably connected inside the guide groove, and the guide fixing seat is fixedly connected to the three-stage floating bottom cutter. A reset spring is sleeved on the outside of the bottom cutter disc, and its two ends are fixedly connected to the lower surface of the upper limit stage and the guide fixing seat, respectively.

[0006] Furthermore, the impact disc also includes: A locking groove is provided in the guide groove and located above the guide fixing seat; A locking spring is fixedly connected to the inner end face of the locking groove. A locking steel ball is fixedly connected to the end of the locking spring away from the inner end face of the locking groove. The locking steel ball is slidably disposed inside the locking groove. Two symmetrically arranged limiting protrusions are installed on the locking groove. The distance between the two limiting protrusions is less than the maximum diameter of the locking steel ball, which is used to radially limit the locking steel ball.

[0007] Furthermore, the upper edge of the guide fixing seat near the guide groove adopts a right-angle structure to restrict the three-stage floating bottom knife from disengaging upward from the locking steel ball; The lower edge of the guide fixing seat near the guide groove is rounded so that it can pass over the locking steel ball when the three-stage floating bottom knife is reset downwards.

[0008] Furthermore, the tool assembly also includes: The first-stage lifting blade, located at the upper part of the blade column, is shaped like an upward-curving wing plate and is used to generate an upward vortex during rotation, which promotes the circulation of the coal sample in the container; The secondary long blade is located in the middle of the blade column and extends radially along the blade column. Its blade adopts a stepped multi-edge design and is used for multi-stage shearing of coal samples.

[0009] Furthermore, the blade post is inserted into a slot at the bottom of the driven magnetic rotor via a pentagonal ...

[0010] Furthermore, it also includes: A gas collection and measurement assembly is located on one side of the crushing tank. The gas collection and measurement assembly includes a gas outlet pipe that communicates with the inside of the tank cover. A metal filter screen is installed at one end of the gas outlet pipe located inside the tank cover. The other end of the gas outlet pipe is connected to the air inlet of a gas desorption measuring instrument located on one side of the crushing tank via a rubber tube. A shut-off valve is installed on the gas outlet pipe.

[0011] Furthermore, the sealing assembly includes: The lower chuck is located at the opening end of the crushing tank; The upper chuck is located at the bottom of the upper cover of the tank body and corresponds to the lower chuck; A sealing gasket is provided between the mating surfaces of the lower chuck and the upper chuck, and a detachable sealed connection is achieved through a quick-release clamp.

[0012] Furthermore, the quick-release clamp includes: Two clamping bodies, a wing nut, and a locking bolt are disposed on the outside of the lower chuck and the upper chuck. The two clamping bodies are sleeved on the outside of the lower chuck and the upper chuck. One end of the two clamping bodies is connected by a pin, and the other end is connected by the wing nut and the locking bolt.

[0013] A measurement method for a magnetically driven integrated coal sample crushing-desorption device includes the following steps: The coal sample to be tested is loaded into the crushing tank, and the top cover of the tank is closed to the crushing tank. A high airtightness seal is achieved through the sealing component. The motor is started, and the motor drives the active magnetic rotor to rotate through the transmission shaft. The active magnetic rotor drives the driven magnetic rotor to rotate through magnetic coupling. The driven magnetic rotor drives the tool post and the tool assembly to rotate. During the rotation of the blade column, the three-stage floating bottom blade impacts and crushes the coal sample at the bottom of the tank. When it encounters large hard coal particles, the coal particles squeeze the three-stage floating bottom blade, causing it to overcome the elastic force of the reset spring and float upward. This causes the guide fixing seat to slide upward along the guide groove, compressing the reset spring and causing the three-stage floating bottom blade to float upward to avoid obstacles, thus putting the three-stage floating bottom blade into a floating state. After the large coal particles are broken, the three-stage floating bottom knife is reset downward under the action of the reset spring, so that the three-stage floating bottom knife returns to the locked state and continues to break the coal sample at the bottom of the tank; After the coal sample is crushed, the desorbed gas inside the crushing tank is collected and measured using measuring instruments, thus completing the integrated measurement of coal sample crushing and desorption.

[0014] Compared with the prior art, the technical solution provided by this invention has the following advantages: This invention, by setting a tank sealing assembly in conjunction with a magnetic coupling transmission structure, abandons the dynamic sealing form of the traditional equipment where the transmission shaft passes through the tank. It utilizes the air gap isolation between the active and driven magnetic rotors to achieve contactless magnetic transmission, completely eliminating the sealing wear and leakage hazards caused by shaft penetration. This effectively ensures the high airtightness of the crushing tank, avoids gas leakage during coal sample analysis, significantly improves the accuracy and repeatability of gas detection data, and avoids safety risks caused by gas escape, significantly improving equipment operation safety. Simultaneously, through the cooperation of the three-stage floating bottom cutter and the impact plate, when encountering large, hard coal particles, the coal particles squeeze the three-stage floating bottom cutter, causing it to overcome the elasticity of the return spring and float upwards. This drives the three-stage floating bottom cutter to slide upwards along the guide groove, compressing the return spring and causing the three-stage floating bottom cutter to... The system enters a floating state for obstacle avoidance. After large coal particles are broken, the three-stage floating bottom cutter is reset downwards under the action of the return spring, restoring the three-stage floating bottom cutter to the locked state and continuing to crush the coal sample at the bottom of the tank. This floating obstacle avoidance mechanism effectively solves the problems of easy jamming, easy breakage, and easy motor overload and transmission structure damage caused by traditional rigid cutters. It ensures continuous and stable crushing operation, significantly reduces equipment failure rate, and extends the service life of the whole machine. At the same time, the floating adaptive crushing structure can improve the overall crushing uniformity of the coal sample and ensure that the coal sample fully desorbs gas, providing a reliable basis for accurate gas content detection. The overall structure takes into account high airtightness, transmission stability, and adaptability to complex working conditions, effectively making up for the shortcomings of poor sealing, easy jamming, and insufficient stability of traditional equipment. Thus, it can fully meet the high-precision, high-stability, and high-safety operation requirements of coal mine coal sample crushing and desorption detection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a magnetically driven coal sample crushing-desorption integrated device and its testing method provided in an embodiment of the present invention; Figure 2 Provided for embodiments of the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is an exploded view of the transmission mechanism provided in an embodiment of the present invention; Figure 4 Provided for embodiments of the present invention Figure 1 Enlarged view at point B in the middle; Figure 5 Provided for embodiments of the present invention Figure 4 Enlarged view at point C; Figure 6 This is a schematic diagram of the clamp structure provided in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Handle; 2. Motor; 3. Timer switch; 4. Power switch; 5. Tank cover; 6. Driven magnetic rotor fixing rod; 7. Crushing tank; 8. First-stage lifting blade; 9. Second-stage long blade; 10. Third-stage floating bottom blade; 11. Blade column; 12. Lower chuck; 13. Sealing gasket; 14. Upper chuck; 15. Drive shaft; 16. Metal filter screen; 17. Shut-off valve; 18. Gas outlet pipe; 19. Rubber hose; 20. Air inlet; 21. Water inlet; 22. Water outlet; 23. Active magnetic rotor; 24. Driven magnetic rotor fixed shaft; 25. First bearing; 26. Driven magnetic rotor; 27. Preload spring; 28. Second bearing; 29. ​​Pentagonal plum blossom column; 30. Bottom cutter head; 31. Return spring; 32. Fixed shaft; 33. Upper limit stage; 34. Guide groove; 35. Lower limit stage; 36. Guide fixing seat; 37. Locking spring; 38. Locking steel ball; 39. Locking groove; 40. Limiting protrusion; 41. Pin; 42. Clamp body; 43. Wing nut; 44. Locking bolt. Detailed Implementation

[0017] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 the technical solution of 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.

[0019] The present invention will be described below through several specific embodiments. To keep the following description of the embodiments clear and concise, detailed descriptions of known functions and components may be omitted. When any component of an embodiment of the present invention appears in more than one drawing, the component may be represented by the same reference numerals in each drawing.

[0020] like Figures 1-6As shown in the figure, an embodiment of the present invention provides a magnetically driven coal sample crushing-desorption integrated device, comprising: The tank assembly includes a crushing tank 7 and a tank cover 5 located at the upper end of the crushing tank 7, and a sealing assembly is provided between the crushing tank 7 and the tank cover 5. The transmission mechanism includes a motor 2 located outside the tank cover 5. The output end of the motor 2 is fixedly connected to an active magnetic rotor 23 via a transmission shaft 15. A driven magnetic rotor 26 is provided on one side of the active magnetic rotor 23. One end of the driven magnetic rotor 26 is fixedly connected to a driven magnetic rotor fixing shaft 24 installed at the bottom of the tank cover 5 via a first bearing 25, and the other end is fixedly connected to a driven magnetic rotor fixing rod 6 installed on the tank cover 5 via a second bearing 28, forming a double-end bearing support structure. The crushing mechanism includes a cutter column 11 placed inside the crushing tank 7 and a cutter assembly mounted on the cutter column 11. The cutter assembly includes a three-stage floating bottom cutter 10 mounted on the bottom of the cutter column 11 via an impact disc. The impact plate includes: The bottom cutter head 30 is mounted on the cutter column 11, and the two ends of the bottom cutter head 30 are respectively fixedly connected to the upper limit stage 33 and the lower limit stage 35; Two guide grooves 34 are symmetrically arranged on the bottom cutter head 30 and located between the upper limit stage 33 and the lower limit stage 35. A guide fixing seat 36 is slidably connected inside the guide groove 34, and the guide fixing seat 36 is fixedly connected to the three-stage floating bottom cutter 10. The return spring 31 is sleeved on the outside of the bottom cutter disc 30, and its two ends are fixedly connected to the lower surface of the upper limit stage 33 and the guide fixing seat 36, respectively. The coal sample to be tested is loaded into the crushing tank 7. The tank cover 5 of the tank assembly is sealed to the crushing tank 7 through a sealing component to achieve a high airtight seal and prevent gas desorption leakage during the coal sample crushing process. Then, the motor 2 drives the active magnetic rotor 23 to rotate through the transmission shaft 15. Relying on the principle of magnetic non-contact transmission, it drives the driven magnetic rotor 26 in the tank to rotate synchronously. With the double-end bearing support structure formed by the driven magnetic rotor fixed shaft 24 and the driven magnetic rotor fixed rod 6 connected to the two ends of the driven magnetic rotor 26 respectively, the coaxiality and overall stability of the transmission operation are greatly improved, effectively avoiding the defects of sealing failure and gas and powder leakage caused by traditional mechanical through transmission. The rotation of the driven magnetic rotor 26 drives the cutter column 11 and the cutter assembly on it to rotate. The three-stage floating bottom cutter 10 mounted on the impact plate at the bottom of the cutter column 11 performs impact crushing operation on the coal sample at the bottom of the tank. When encountering large hard coal lumps, the coal lumps squeeze the three-stage floating bottom cutter 10, making them... Overcoming the elastic force of the return spring 31, the material floats upward, causing the guide fixing seat 36 to slide upward along the guide groove 34 on the bottom knife disc 30, compressing the return spring 31, and causing the three-stage floating bottom knife 10 to float upward to avoid obstacles, so that the three-stage floating bottom knife 10 enters the floating state. When the large coal particles are broken, the squeezing force disappears, the return spring 31 elastically resets, causing the guide fixing seat 36 and the three-stage floating bottom knife 10 to reset downward, so that the three-stage floating bottom knife 10 returns to the locked state and continues to crush the coal sample at the bottom of the tank. The floating three-stage floating bottom knife 10 achieves adaptive obstacle avoidance crushing. While completing the efficient and uniform crushing of the coal sample, there is no need to change the tank or transfer the sample. The entire process of coal sample crushing and desorption can be completed continuously, realizing the integrated continuous operation of crushing and desorption, eliminating the problems of sample contamination and gas loss, thereby greatly improving experimental efficiency, ensuring the authenticity and reliability of measurement data, and adapting to the scientific research experimental needs related to coal sample gas desorption. Among them, since the active magnetic rotor 23 drives the driven magnetic rotor 26 to rotate synchronously through magnetic force, non-contact torque transmission is achieved. When the resistance torque generated when the tool assembly crushes the coal sample exceeds the maximum synchronous transmission torque of the magnetic rotor, the active magnetic rotor 23 and the driven magnetic rotor 26 will automatically slip magnetically and rotate relative to each other, cutting off the rigid torque transmission path in time, realizing automatic overload unloading protection, which can effectively avoid overload damage problems such as motor burnout, transmission shaft 15 breakage, tool breakage, and bearing deformation. Furthermore, in order to ensure the magnetic coupling transmission efficiency between the active magnetic rotor 23 and the driven magnetic rotor 26, the tank cover 5 is made of austenitic stainless steel non-magnetic material to ensure that the magnetic field can smoothly penetrate the tank cover 5 to complete the force transmission. At the same time, the design stage fully considers the magnetic field attenuation caused by the tank cover 5. By optimizing the magnet specifications, magnetic pole arrangement and air gap spacing of the active magnetic rotor 23 and the driven magnetic rotor 26, sufficient magnetic transmission margin is reserved to offset the magnetic loss caused by structural obstruction. This ensures that after the magnetic field penetrates and attenuates, it can still transmit sufficient torque to drive the crushing mechanism, thereby ensuring the normal operation of the crushing mechanism inside the crushing tank 7.

[0021] Furthermore, such as Figures 1-6 As shown, the impact plate also includes: The locking groove 39 is located in the guide groove 34 and above the guide fixing seat 36; A locking spring 37 is fixedly connected to the inner end face of the locking groove 39. A locking steel ball 38 is fixedly connected to the end of the locking spring 37 away from the inner end face of the locking groove 39. The locking steel ball 38 is slidably disposed inside the locking groove 39. Two symmetrically arranged limiting protrusions 40 are installed on the locking groove 39. The distance between the two limiting protrusions 40 is less than the maximum diameter of the locking steel ball 38, which is used to radially limit the locking steel ball 38. By setting a locking groove 39 structure with a locking spring 37 and a locking steel ball 38 above the guide groove 34 of the impact plate, and cooperating with symmetrically arranged limiting protrusions 40 to achieve the anti-detachment limiting of the steel ball, when the three-stage floating bottom knife 10 encounters a hard coal block and floats upward to avoid the obstacle, the guide fixing seat 36 slides upward along the guide groove 34 and squeezes the locking steel ball 38, causing the locking spring 37 to compress and retract, and the locking steel ball 38 to slide and retract into the locking groove 39 to make way, ensuring that the three-stage floating bottom knife 10 floats smoothly to avoid the obstacle and avoids the knife jamming damage. When the coal block is crushed and the three-stage floating bottom knife 10 falls back to reset, the locking spring 37 pushes the locking steel ball 38 to reset and protrude, forming a locking limit on the guide fixing seat 36, preventing the bottom knife from irregularly moving, shaking and deviating during normal crushing operations, thereby improving the overall stability and crushing uniformity of the knife under conventional crushing conditions. At the same time, the limiting protrusions 40 restrict the locking steel ball 38 from falling out, thereby ensuring the long-term stable and reliable operation of the locking structure.

[0022] Furthermore, such as Figures 1-6 As shown, the upper edge of the guide fixing seat 36 near the guide groove 34 adopts a right-angle structure to restrict the three-stage floating bottom knife 10 from disengaging from the locking steel ball 38. This can restrict the three-stage floating bottom knife 10 from disengaging from the locking steel ball 38 when it floats upward, thus preventing excessive floating and structural misalignment and affecting crushing stability. The lower edge of the guide fixing seat 36 near the guide groove 34 is rounded to allow the three-stage floating bottom knife 10 to pass over the locking steel ball 38 when it resets downwards. This reduces the frictional resistance between the three-stage floating bottom knife 10 and the locking steel ball 38 when it resets downwards, allowing it to pass over the locking steel ball 38 smoothly and return to the locked state. This ensures the stable operation of the impact disc structure and improves the continuity and reliability of coal sample crushing.

[0023] Furthermore, such as Figures 1-6 As shown, the tool assembly also includes: The first-stage lifting blade 8 is located on the upper part of the blade column 11 and is shaped like an upward-curving wing plate. It is used to generate an upward vortex during rotation, which promotes the circulation of coal sample in the tank. When the first-stage lifting blade 8 rotates, it can generate an upward vortex, which drives the coal sample in the tank to circulate and prevent coal sample accumulation. It ensures that each piece of coal sample can be evenly stressed and fully crushed, while allowing the coal sample to fully contact the space inside the tank, which is convenient for the subsequent release and collection of gases such as methane. The secondary long blade 9 is located in the middle of the blade column 11 and extends radially along the blade column 11. Its blade adopts a stepped multi-edge design and is used for multi-stage shearing of coal samples. It can gradually shear large coal samples into smaller pieces to meet experimental requirements. The primary lifting blade 8 and the secondary long blade 9 work together to achieve efficient and uniform crushing of coal samples, ensuring the accuracy of subsequent gas collection and measurement, and adapting to the needs of coal sample processing in scientific research experiments.

[0024] Furthermore, such as Figures 1-6 As shown, the cutter column 11 is inserted into a groove at the bottom of the driven magnetic rotor 26 via a pentagonal plum blossom column 29. The groove is located at the interface between the driven magnetic rotor 26 and the pentagonal plum blossom column 29, and a pre-tension spring 27 is provided inside the groove. The end of the cutter column 11 away from the pentagonal plum blossom column 29 is rotatably connected to a fixed shaft 32 fixedly installed on the bottom surface of the crushing tank 7. The cutter column 11 is inserted into the groove at the bottom of the driven magnetic rotor 26 via the pentagonal plum blossom column 29, and a pre-tension spring 27 is provided inside the groove. At the same time, the lower end of the cutter column 11 is rotatably supported and positioned by the fixed shaft 32 on the bottom surface of the crushing tank 7. The multi-faceted interlocking structure of the pentagonal plum blossom column 29 reliably transmits rotational torque, avoiding circumferential slippage and free rotation. The preload spring 27 continuously provides axial preload force, eliminating assembly gaps and improving the coaxiality and transmission stability of operation. When the tank cover 5 is opened, the blade column 11 and the driven magnetic rotor 26 quickly undergo axial displacement and disengage under the action of the preload spring 27's reset force, thereby physically interrupting the power transmission. This effectively avoids the unexpected start of the transmission mechanism and crushing mechanism due to accidental switch triggering, providing passive safety protection against accidental contact for operators and equipment.

[0025] Furthermore, such as Figures 1-6 As shown, it also includes: A gas collection and measurement assembly is located on one side of the crushing tank 7. The assembly includes a gas outlet pipe 18 connected to the inside of the tank cover 5. A metal filter screen 16 is installed at one end of the gas outlet pipe 18 inside the tank cover 5. The other end of the gas outlet pipe 18 is connected via a hose 19 to the inlet 20 of a gas desorption measuring instrument located on one side of the crushing tank 7. A shut-off valve 17 is installed on the gas outlet pipe 18. By connecting the gas outlet pipe 18 inside the tank cover 5 and installing the metal filter screen 16 at the inner end of the gas outlet pipe 18, effective interception of gas can be achieved during the gas discharge process. Fine coal dust particles are cut off to prevent them from entering the pipeline with the airflow and causing blockage or contamination of subsequent testing instruments. The gas outlet pipe 18 is connected to the air inlet 20 of the gas desorption measuring instrument via the rubber tube 19. At the same time, a shut-off valve 17 is installed on the pipeline to control the pipeline opening and closing according to the operation process. This allows for the smooth export of gas gas released from the tank during the coal sample crushing and desorption stage, achieving closed and leak-free collection. It also allows for timely closure of the shut-off valve 17 after sampling to prevent the reverse leakage of residual gas gas in the tank. This ensures that the gas collection process is closed and controllable, and that the airflow is pure and free of impurities, thereby improving the accuracy and reliability of gas desorption content detection.

[0026] Furthermore, such as Figures 1-6 As shown, the gas desorption measuring instrument has a water inlet 21 and a water outlet 22 at the bottom and side wall, respectively, and the gas desorption measuring instrument has a scale value. The gas desorption measuring instrument realizes the filling and discharge of internal water through the water inlet 21 at the bottom and the water outlet 22 at the side wall. With the surface scale value, the water level change can be read in real time, thereby converting the volume data of gas desorption in the coal sample to ensure that the measurement is intuitive and accurate, and meets the quantitative detection requirements of coal sample gas desorption experiment.

[0027] Furthermore, such as Figures 1-6 As shown, the sealing assembly includes: The lower chuck 12 is located at the open end of the crushing tank 7; The upper chuck 14 is located at the bottom of the upper cover 5 of the tank body and corresponds to the lower chuck 12; A sealing gasket 13 is provided between the mating surfaces of the lower chuck 12 and the upper chuck 14, and a detachable sealing connection is achieved through a quick-release clamp. The sealing gasket 13 is placed between the mating surfaces of the upper chuck 14 and the lower chuck 12, and an axial clamping force is applied to the two chucks through the quick-release clamp, causing the sealing gasket 13 to undergo elastic deformation, thereby constructing a highly airtight sealing interface. This enables quick disassembly and assembly and a highly airtight seal between the crushing tank 7 and the tank cover 5, effectively preventing gas leakage and ensuring the sealing performance of the coal sample crushing and desorption process and the accuracy of experimental data.

[0028] Furthermore, such as Figures 1-6 As shown, the quick-release clamp includes: Two clamp bodies 42, wing nuts 43, and locking bolts 44 are located on the outside of the lower chuck 12 and the upper chuck 14. The two clamp bodies 42 are sleeved on the outside of the lower chuck 12 and the upper chuck 14. One end of the two clamp bodies 42 is connected by a pin 41, and the other end is connected by a wing nut 43 and a locking bolt 44. The quick-release clamps, through the cooperation of the two clamp bodies 42, pin 41, wing nuts 43, and locking bolts 44, quickly clamp and lock the upper chuck 14 and the lower chuck 12, realizing convenient disassembly and assembly and reliable sealing of the tank cover 5 and the crushing tank 7. No special tools are required for quick tightening and loosening, and the operation is simple. At the same time, it ensures uniform pressure on the mating surface, further improving the sealing reliability and meeting the requirements of high airtightness and high-efficiency assembly and disassembly in gas desorption experiments.

[0029] Furthermore, such as Figures 1-6 As shown, a timer switch 3 and a power switch 4 are installed on the outside of the tank cover 5. The timer switch 3 and the power switch 4 are electrically connected to the motor 2. The starting of the motor 2 is controlled by the dual logic constraints of the power switch 4 and the timer switch 3. Only when the power switch 4 is in the on state and the timer switch 3 is in the preset working period can the circuit be connected and the motor 2 be driven to run, so as to realize the crushing operation. This can effectively avoid accidental starting due to misoperation, thereby improving the safety of equipment operation.

[0030] Furthermore, such as Figures 1-6 As shown, a protective shell is provided on the outside of the motor 2, and a handle 1 is installed on the top of the protective shell. The protective shell can isolate and protect the motor 2 to prevent collisions, dust interference and accidental contact by personnel, thereby improving operational safety and service life. The handle 1 on the top makes it easy to lift, move and transport the whole device, thereby enhancing the portability and ease of operation of the equipment.

[0031] like Figures 1-6 As shown in the figure, the measurement method of the integrated magnetic drive coal sample crushing-desorption device provided in this embodiment includes the following steps: S1: Fill the gas desorption measuring instrument with water to the predetermined scale, tighten the plug and ensure there is no leakage, record the scale as the initial value, then connect the outlet end of the gas outlet tube 18 to the air inlet 20 of the gas desorption measuring instrument with the rubber tube 19, ensure that the connection is sealed and reliable, and at the same time check the sealing status of the water inlet 21 and water outlet 22 of the gas desorption measuring instrument to ensure that there is no risk of water leakage; S2: Select the coal sample to be tested from the coal sample basin, divide it into two sub-coal samples of equal mass, record the mass of each coal sample, and control the coal sample mass between 100 and 300g to ensure that the two coal samples have the same characteristics. S3: Check the cleanliness of the inside of the crushing tank 7, insert the cutter column 11 into the column groove at the bottom of the driven magnetic rotor 26, and make the pentagonal plum blossom column 29 fit into the column groove; take a coal sample and pour it into the crushing tank 7, place the sealing gasket 13 between the mating surfaces of the lower chuck 12 and the upper chuck 14, cover the tank cover 5, align the upper chuck 14 with the lower chuck 12, put the two clamps 42 on the outside of the lower chuck 12 and the upper chuck 14, and lock them with the wing nut 43 and the locking bolt 44, so that the sealing gasket 13 undergoes elastic deformation to achieve a high airtightness seal; S4: Open the shut-off valve 17 on the gas outlet pipe 18, turn on the power switch 4, rotate the timer switch 3 to set the crushing time, start the motor 2, the motor 2 drives the active magnetic rotor 23 to rotate through the transmission shaft 15, the active magnetic rotor 23 drives the driven magnetic rotor 26 to rotate synchronously through magnetic coupling, the driven magnetic rotor 26 drives the cutter column 11 and the cutter assembly to rotate, and start crushing and desorption. S5: The rotation of the blade column 11 drives the first-stage tilting blade 8, the second-stage long blade 9, and the third-stage floating bottom blade 10 to rotate synchronously; The first-stage cutting blade 8 generates an upward vortex, which promotes the circulation of the coal sample within the container and prevents the coal sample from accumulating. The secondary long blade 9 uses a stepped multi-blade design to perform multi-stage shearing and crushing of the coal sample, gradually refining the coal sample. The three-stage floating bottom knife 10 impacts and crushes the coal sample at the bottom of the tank. When it encounters large, hard coal lumps, the coal lumps squeeze the three-stage floating bottom knife 10, causing it to overcome the elastic force of the return spring 31 and float upward. This causes the guide fixing seat 36 to slide upward along the guide groove 34 on the bottom knife disc 30. The guide fixing seat 36 pushes the locking steel ball 38 in the locking groove 39, compresses the locking spring 37 and passes over the locking steel ball 38, and the three-stage floating bottom knife 10 enters the floating state. After the large coal particles are crushed, the three-stage floating bottom knife 10 is reset downward under the elastic force of the reset spring 31. The guide fixing seat 36 passes over the locking steel ball 38. With the cooperation of the locking spring 37 and the locking steel ball 38, the three-stage floating bottom knife 10 returns to the locked state and continues to perform stable impact crushing on the coal sample. When the resistance torque generated by the tool assembly when breaking the coal sample exceeds the maximum synchronous torque of the magnetic coupler, the active magnetic rotor 23 and the driven magnetic rotor 26 automatically slip relative to each other, cutting off the torque transmission path and preventing the transmission mechanism from being damaged due to overload. S6: The gas generated by desorption during the coal sample crushing process is filtered by the metal filter 16 at the gas outlet pipe 18 port and then enters the gas desorption measuring instrument through the gas outlet pipe 18 and the rubber tube 19 in sequence; the gas desorption volume is observed. When the measured desorbed gas volume reaches 85% of the maximum range of the gas desorption measuring instrument, the shut-off valve 17 is closed, the gas desorption measuring instrument is replaced, and then the shut-off valve 17 is opened again and the data is recorded. S7: Repeat S1-S6 above to measure another coal sample; S8: The coal sample is considered qualified when it is crushed to more than 95% and passes through a 60-mesh 0.25mm sieve; after desorption is completed, the termination reading of the gas desorption measuring instrument is read. The difference between the termination reading and the initial reading recorded in S1 is the desorbed gas volume under this condition, thus completing the integrated measurement of coal sample crushing and desorption.

[0032] The above inventions are merely a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A magnetically driven integrated coal sample crushing-desorption device, characterized in that, include: The tank assembly includes a crushing tank and a tank cover disposed at the upper end of the crushing tank, and a sealing assembly is provided between the crushing tank and the tank cover; The transmission mechanism includes a motor located outside the tank cover. The output end of the motor is fixedly connected to an active magnetic rotor via a transmission shaft. A driven magnetic rotor is provided on one side of the active magnetic rotor. One end of the driven magnetic rotor is fixedly connected to a driven magnetic rotor fixed shaft installed at the bottom of the tank cover via a first bearing, and the other end is fixedly connected to a driven magnetic rotor fixed rod installed on the tank cover via a second bearing, forming a double-end bearing support structure. The crushing mechanism includes a cutter column placed inside the crushing tank and a cutter assembly mounted on the cutter column. The cutter assembly includes a three-stage floating bottom cutter mounted on the bottom of the cutter column via an impact disc. The impact disc includes: A bottom cutter head is mounted on the cutter column, and an upper limit platform and a lower limit platform are fixedly connected to both ends of the bottom cutter head; Two guide grooves are symmetrically arranged on the bottom cutter head and located between the upper limit platform and the lower limit platform. A guide fixing seat is slidably connected inside the guide groove, and the guide fixing seat is fixedly connected to the three-stage floating bottom cutter. A reset spring is sleeved on the outside of the bottom cutter disc, and its two ends are fixedly connected to the lower surface of the upper limit stage and the guide fixing seat, respectively.

2. The integrated magnetic drive coal sample crushing-desorption device as described in claim 1, characterized in that, The impact plate also includes: A locking groove is provided in the guide groove and located above the guide fixing seat; A locking spring is fixedly connected to the inner end face of the locking groove. A locking steel ball is fixedly connected to the end of the locking spring away from the inner end face of the locking groove. The locking steel ball is slidably disposed inside the locking groove. Two symmetrically arranged limiting protrusions are installed on the locking groove. The distance between the two limiting protrusions is less than the maximum diameter of the locking steel ball, which is used to radially limit the locking steel ball.

3. The integrated magnetic drive coal sample crushing-desorption device as described in claim 2, characterized in that, The upper edge of the guide fixing seat near the guide groove has a right-angle structure to prevent the three-stage floating bottom knife from disengaging upward from the locking steel ball; The lower edge of the guide fixing seat near the guide groove is rounded so that it can pass over the locking steel ball when the three-stage floating bottom knife is reset downwards.

4. The integrated magnetic drive coal sample crushing-desorption device as described in claim 1, characterized in that, The cutting tool assembly also includes: The first-stage lifting blade, located at the upper part of the blade column, is shaped like an upward-curving wing plate and is used to generate an upward vortex during rotation, which promotes the circulation of the coal sample in the container; The secondary long blade is located in the middle of the blade column and extends radially along the blade column. Its blade adopts a stepped multi-edge design and is used for multi-stage shearing of coal samples.

5. The integrated magnetic drive coal sample crushing-desorption device as described in claim 1, characterized in that, The blade post is inserted into a slot at the bottom of the driven magnetic rotor via a pentagonal pentagonal column. The slot is located at the interface between the driven magnetic rotor and the pentagonal pentagonal column, and a preload spring is provided inside the slot.

6. The integrated magnetic drive coal sample crushing-desorption device as described in claim 1, characterized in that, Also includes: A gas collection and measurement assembly is located on one side of the crushing tank. The gas collection and measurement assembly includes a gas outlet pipe that communicates with the inside of the tank cover. A metal filter screen is installed at one end of the gas outlet pipe located inside the tank cover. The other end of the gas outlet pipe is connected to the air inlet of a gas desorption measuring instrument located on one side of the crushing tank via a rubber tube. A shut-off valve is installed on the gas outlet pipe.

7. The integrated magnetic drive coal sample crushing-desorption device as described in claim 1, characterized in that, The sealing assembly includes: The lower chuck is located at the opening end of the crushing tank; The upper chuck is located at the bottom of the upper cover of the tank body and corresponds to the lower chuck; A sealing gasket is provided between the mating surfaces of the lower chuck and the upper chuck, and a detachable sealed connection is achieved through a quick-release clamp.

8. The integrated magnetic drive coal sample crushing-desorption device as described in claim 7, characterized in that, The quick-release clamp includes: Two clamping bodies, a wing nut, and a locking bolt are disposed on the outside of the lower chuck and the upper chuck. The two clamping bodies are sleeved on the outside of the lower chuck and the upper chuck. One end of the two clamping bodies is connected by a pin, and the other end is connected by the wing nut and the locking bolt.

9. A measurement method based on the integrated magnetic drive coal sample crushing-desorption device according to any one of claims 1-8, characterized in that, Includes the following steps: The coal sample to be tested is loaded into the crushing tank, and the top cover of the tank is closed to the crushing tank. A high airtightness seal is achieved through the sealing component. The motor is started, and the motor drives the active magnetic rotor to rotate through the transmission shaft. The active magnetic rotor drives the driven magnetic rotor to rotate through magnetic coupling. The driven magnetic rotor drives the tool post and the tool assembly to rotate. During the rotation of the blade column, the three-stage floating bottom blade impacts and crushes the coal sample at the bottom of the tank. When it encounters large hard coal particles, the coal particles squeeze the three-stage floating bottom blade, causing it to overcome the elastic force of the reset spring and float upward. This causes the guide fixing seat to slide upward along the guide groove, compressing the reset spring and causing the three-stage floating bottom blade to float upward to avoid obstacles, thus putting the three-stage floating bottom blade into a floating state. After the large coal particles are broken, the three-stage floating bottom knife is reset downward under the action of the reset spring, so that the three-stage floating bottom knife returns to the locked state and continues to break the coal sample at the bottom of the tank; After the coal sample is crushed, the desorbed gas inside the crushing tank is collected and measured using measuring instruments, thus completing the integrated measurement of coal sample crushing and desorption.

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