Coal quality detection and analysis auxiliary device for coal

Abstract

The invention discloses a coal quality detection and analysis auxiliary device for coal, and relates to the technical field of coal detection. The freezing and crushing mechanism is mounted on the upper side of one end of the freezing cavity and is used for conveying a low-temperature medium into the freezing cavity so as to realize low-temperature embrittlement of the coal sample; the liquid nitrogen storage tank is mounted at the other end of the freezing and crushing mechanism; through cooperative work of a first electric guide rail, a moving block, a telescopic pipe, a low-temperature conveying pipe, an electromagnetic flow valve and a liquid nitrogen flow dividing pipe, low-temperature freezing breaking of a coal sample is achieved, the first electric guide rail drives the liquid nitrogen flow dividing pipe to flexibly move and adjust the position, and liquid nitrogen is conveyed to the liquid nitrogen flow dividing pipe from a liquid nitrogen storage tank through the low-temperature conveying pipe; compared with the coal sample crushing mode of a jaw crusher, the coal sample crushing device has the advantages that the crushing energy consumption is greatly reduced, the problem of high energy consumption of the jaw crusher is effectively solved, and meanwhile, the dust pollution is reduced.

Description

Technical Field

[0001] This invention relates to the field of coal testing technology, and more specifically to an auxiliary device for coal quality testing and analysis. Background Technology

[0002] Coal quality testing and analysis is a core step in assessing coal quality, clarifying its uses and economic value. It involves the accurate determination of multiple indicators such as ash content, volatile matter, calorific value, and sulfur content. To ensure the scientific validity and representativeness of the test results, the sampling and sample preparation process must be standardized before analysis. First, based on the characteristics of the coal type, storage method, and particle size distribution, raw coal samples are collected using stratified sampling, random sampling, or systematic sampling methods. Then, a jaw crusher is used to crush the coal sample to the specified particle size. The sample volume is then reduced proportionally to the amount required for analysis using a fractionator. Finally, the sample is dried in a low-temperature environment below 40°C to remove surface moisture. For samples requiring elemental analysis or micro-component determination, further grinding to a fine particle size is necessary to ensure the accuracy of subsequent tests.

[0003] When the existing auxiliary equipment is in use, the jaw crusher crushes the coal sample by squeezing, splitting and other mechanical forces, which requires a lot of electrical energy to drive the motor and transmission components, resulting in high energy consumption of the equipment and dust pollution problems. Summary of the Invention

[0004] The purpose of this invention is to provide an auxiliary device for coal quality testing and analysis, so as to solve the problems of high energy consumption and serious dust pollution of existing auxiliary devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an auxiliary device for coal quality detection and analysis, comprising a freezing chamber;

[0006] A cryogenic crushing mechanism is installed on the upper side of one end of the cryogenic chamber to deliver a low-temperature medium into the cryogenic chamber to achieve low-temperature embrittlement of the coal sample;

[0007] A liquid nitrogen storage tank is installed at the other end of the freezing and crushing mechanism;

[0008] The cryogenic crushing mechanism includes a first electric guide rail, a moving block, a telescopic tube, a cryogenic conveying tube, an electromagnetic flow valve, and a liquid nitrogen distribution tube. The first electric guide rail is installed in the middle of the top inner wall of the cryogenic chamber. The moving block is installed at the bottom end of the first electric guide rail. The liquid nitrogen distribution tube is installed at the bottom end of the moving block. The telescopic tube is installed on the upper side of one end of the liquid nitrogen distribution tube and is connected to it. The cryogenic conveying tube is installed on the other end of the telescopic tube and is connected to it. The other end of the cryogenic conveying tube is installed on the lower side of the outer wall of the liquid nitrogen storage tank and is connected to it. The electromagnetic flow valve is located in the middle of the outer wall of the cryogenic conveying tube.

[0009] The crushing chamber is installed at the bottom center of the freezing chamber.

[0010] Furthermore, four tank support legs are installed on the lower side of the outer wall of the liquid nitrogen storage tank, and an inlet and outlet are opened in the middle of the other end of the freezing chamber. The bearing mechanism extends into the interior of the freezing chamber through the inlet and outlet and is pulled outward along the inlet and outlet to load and unload coal samples. A discharge mechanism is installed inside the bottom wall of the freezing chamber, and a control panel is installed in the middle of the outer wall of the freezing chamber.

[0011] Furthermore, support brackets are installed on both sides of the bottom of the freezing chamber, and a component is installed at each of the four corners of the top of the freezing chamber. An exhaust valve is installed at two opposite corners, and a temperature sensor is installed at the other two opposite corners. Two crushing rollers are horizontally installed on the upper part of the inner walls on both sides of the crushing box via bearings.

[0012] Furthermore, the bearing mechanism includes a fixed frame, a coal sample carrying basket, a tilting drive assembly, two second electric guide rails, and a sealed chamber door. The coal sample carrying basket is mounted between the inner walls of both sides of the fixed frame via bearings. The tilting drive assembly is mounted at the middle of one end of the fixed frame. The two second electric guide rails are respectively mounted on the outer walls of both sides of the fixed frame, and the ends of the two second electric guide rails away from the fixed frame are respectively mounted at the middle of the inner walls of both sides of the freezing chamber. The sealed chamber door is mounted at the other end of the fixed frame.

[0013] Furthermore, the discharge mechanism includes two positive and negative screws, two discharge drive assemblies, four moving frames, two discharge plates, and two sealing strips. The two positive and negative screws are mounted between the inner walls of both sides of the crushing box via bearings. The two discharge drive assemblies are respectively mounted on one end of the two positive and negative screws. The four moving frames are respectively threaded onto both sides of the outer wall of the two positive and negative screws. The two discharge plates are respectively mounted between the tops of the front and rear moving frames. The two sealing strips are respectively mounted on the outer surface of the two discharge plates.

[0014] Furthermore, a guide frame is installed around the bottom inner wall of the freezing chamber, a discharge port is opened in the middle of the bottom inner wall of the freezing chamber, a sealing groove is opened in the middle of the inner wall on both sides of the discharge port, and a cleaning scraper is installed on the upper part of the inner wall on the other two sides of the discharge port.

[0015] Furthermore, the first electric guide rail and the electromagnetic flow valve are both electrically connected to the control panel, the telescopic tube is configured as a folded structure, the liquid nitrogen diversion tube is configured as a ring structure, and multiple air outlets are opened on the inner side of the liquid nitrogen diversion tube.

[0016] Furthermore, the bottom end face of the support leg and the bottom end face of the storage tank support leg are flush with the bottom end face of the crushing box, the temperature sensor and the crushing roller are electrically connected to the control panel, and the multiple crushing tooth discs on the two crushing rollers are staggered.

[0017] Furthermore, the bottom surface of the coal sample carrying basket is configured as an arc-shaped structure, the flipping drive assembly and the second electric guide rail are both electrically connected to the control panel, the sealing cavity door is configured as a convex structure, and the sealing cavity door is snapped into the inlet and outlet.

[0018] Furthermore, the bottom end face of the cleaning scraper contacts the top end face of the discharge plate, the two discharge plates are movably inserted into the inner walls on both sides of the discharge port, the sealing strip is set as a U-shaped structure, and the sealing strip is slidably connected to the two sealing grooves.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) The present invention achieves low-temperature freezing and crushing of coal samples through the coordinated work of the first electric guide rail, the moving block, the telescopic pipe, the low-temperature conveying pipe, the electromagnetic flow valve and the liquid nitrogen distribution pipe. The first electric guide rail drives the liquid nitrogen distribution pipe to move and adjust its position flexibly. Liquid nitrogen is transported from the liquid nitrogen storage tank to the liquid nitrogen distribution pipe through the low-temperature conveying pipe and sprayed out from multiple air outlets on its inner side to uniformly freeze and embrittle the coal sample in the bearing mechanism. Compared with the way the jaw crusher crushes the coal sample, it greatly reduces the crushing energy consumption, effectively solves the problem of high energy consumption of the jaw crusher, and reduces dust pollution.

[0021] (2) The present invention uses the coordinated work of a fixed frame, a coal sample carrying basket, a flipping drive assembly, a second electric guide rail and a sealed cavity door. The second electric guide rail pushes the coal sample carrying basket out of the freezing chamber and returns it to its original position after loading the sample, so that the coal sample can fully contact liquid nitrogen in the freezing chamber for freezing. After the coal sample is embrittled, the flipping drive assembly drives the coal sample carrying basket to flip, thereby realizing the loading and unloading of the coal sample.

[0022] (3) The present invention achieves smooth discharge of coal samples after freezing and embrittlement and good sealing of the device through the coordinated work of the positive and negative screws, the discharge drive assembly, the moving frame, the discharge plate and the sealing strip. The discharge drive assembly drives the positive and negative screws to rotate, which causes the moving frame to open the discharge plate. The crushed coal sample is discharged through the discharge port. When no discharge is made, the sealing strip ensures the sealing of the discharge port and prevents coal sample leakage and external impurities from entering when no discharge is made. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0025] Figure 2 One of the structural cross-sectional views of the freezing chamber is provided for an embodiment of the present invention;

[0026] Figure 3 Provided for embodiments of the present invention Figure 2 Enlarged view of the structure of A in the middle;

[0027] Figure 4 A second structural cross-sectional view of the freezing chamber is provided for an embodiment of the present invention;

[0028] Figure 5 A schematic diagram showing the connection between the discharge mechanism and the crushing box is provided for an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the structure of the freezing and crushing mechanism is provided for an embodiment of the present invention;

[0030] Figure 7 A structural schematic diagram of the load-bearing mechanism is provided for embodiments of the present invention;

[0031] Figure 8 A schematic diagram of the material discharge mechanism is provided for an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Freezing chamber; 2. Freezing and crushing mechanism; 21. First electric guide rail; 22. Moving block; 23. Telescopic pipe; 24. Cryogenic conveying pipe; 25. Electromagnetic flow valve; 26. Liquid nitrogen diversion pipe; 3. Liquid nitrogen storage tank; 4. Storage tank support legs; 5. Bearing mechanism; 51. Fixed frame; 52. Coal sample carrying basket; 53. Tilting drive assembly; 54. Second electric guide rail; 55. Sealing chamber door; 6. Discharge mechanism; 61. Positive and negative screws; 62. Discharge drive assembly; 63. Moving frame; 64. Discharge plate; 65. Sealing strip; 7. Crushing box; 8. Control panel; 9. Support legs; 10. Exhaust valve; 11. Temperature sensor; 12. Inlet and outlet; 13. Crushing roller; 14. Guide frame; 15. Discharge port; 16. Sealing groove; 17. Cleaning scraper. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] As attached Figure 1 To be continued Figure 8 As shown:

[0036] Example 1:

[0037] This invention provides an auxiliary device for coal quality testing and analysis, including a freezing chamber 1, which is used to pre-treat coal samples in a low-temperature environment to provide a suitable coal sample for subsequent uniformity analysis of coal quality testing. The freezing chamber 1 is made of 316L stainless steel and its inner wall is covered with a heat insulation layer.

[0038] The freezing and crushing mechanism 2 is installed on the upper side of one end of the freezing chamber 1 and is used to deliver a low-temperature medium into the freezing chamber 1 to achieve low-temperature embrittlement of the coal sample.

[0039] Liquid nitrogen storage tank 3 is installed at the other end of the cryogenic crushing mechanism 2 to provide cryogenic medium to the cryogenic crushing mechanism 2;

[0040] The cryogenic crushing mechanism 2 includes a first electric guide rail 21, a moving block 22, a telescopic pipe 23, a cryogenic conveying pipe 24, an electromagnetic flow valve 25, and a liquid nitrogen diversion pipe 26. The first electric guide rail 21 is installed in the middle of the top inner wall of the cryogenic chamber 1. The moving block 22 is installed at the bottom end of the first electric guide rail 21. The liquid nitrogen diversion pipe 26 is installed at the bottom end of the moving block 22 and is used to uniformly spray the cryogenic medium onto the surface of the coal sample. The telescopic pipe 23 is installed on the upper side of one end of the liquid nitrogen diversion pipe 26 and is connected to it. The cryogenic conveying pipe 24 is installed on the other end of the telescopic pipe 23 and is connected to it. The other end of the cryogenic conveying pipe 24 is installed on the lower side of the outer wall of the liquid nitrogen storage tank 3 and is connected to it. The electromagnetic flow valve 25 is located in the middle of the outer wall of the cryogenic conveying pipe 24 and is used to control the flow rate of the cryogenic medium to adjust the embrittlement temperature in the cryogenic chamber 1.

[0041] The crushing box 7 is installed at the bottom center of the freezing chamber 1 and is used to crush the coal sample after low-temperature embrittlement to obtain coal sample particles suitable for coal quality testing and analysis.

[0042] Four tank support legs 4 are installed on the lower side of the outer wall of the liquid nitrogen storage tank 3. An inlet and outlet 12 is opened in the middle of the other end of the freezing chamber 1. The bearing mechanism 5 extends into the interior of the freezing chamber 1 through the inlet and outlet 12 and is pulled out along the inlet and outlet 12 to load and unload coal samples. A discharge mechanism 6 is installed inside the bottom cavity wall of the freezing chamber 1. A control panel 8 is installed in the middle of the outer wall of the freezing chamber 1.

[0043] Support legs 9 are installed on both sides of the bottom of the freezing chamber 1. A component is installed at each of the four corners of the top of the freezing chamber 1. Exhaust valves 10 are installed at two opposite corners to discharge excess gas in the freezing chamber 1. Temperature sensors 11 are installed at the other two opposite corners to monitor the temperature in the freezing chamber 1 in real time. Two crushing rollers 13 are horizontally installed on the upper part of the inner walls on both sides of the crushing box 7 via bearings.

[0044] The first electric guide rail 21 and the electromagnetic flow valve 25 are both electrically connected to the control panel 8. The opening degree of the electromagnetic flow valve 25 can be adjusted and the opening and closing of the first electric guide rail 21 can be controlled through the control panel 8. The telescopic tube 23 is set as a folding structure, which can extend and retract with the movement of the liquid nitrogen diversion tube 26 without affecting the delivery of the cryogenic medium. The telescopic tube 23 is made of polytetrafluoroethylene. The liquid nitrogen diversion tube 26 is set as a ring structure, and multiple air outlets are opened on the inner side of the liquid nitrogen diversion tube 26, which can spray liquid nitrogen evenly.

[0045] The bottom surfaces of the support legs 9 and the storage tank legs 4 are flush with the bottom surface of the crushing box 7 to ensure the stability of the entire device. The temperature sensor 11 and the crushing roller 13 are electrically connected to the control panel 8. The temperature sensor 11 transmits the monitored data to the control panel 8, which controls the rotation of the crushing roller 13. The multiple crushing discs on the two crushing rollers 13 are staggered and can crush the frozen coal sample.

[0046] Working principle: During operation, the vent valve of the liquid nitrogen storage tank 3 is closed via the control panel 8, and then the pressure boosting valve is opened. Liquid nitrogen is transported from the liquid nitrogen storage tank 3 through the cryogenic delivery pipe 24. The electromagnetic flow valve 25 precisely controls the flow rate of the liquid nitrogen. The liquid nitrogen then enters the liquid nitrogen distribution pipe 26 through the telescopic pipe 23 and is sprayed out from multiple vent holes on its inner side. At the same time, the temperature sensor 11 monitors the temperature inside the freezing chamber 1 in real time and feeds the monitoring data back to the control panel 8. The first electric guide rail 21 drives the moving block 22 to move, thereby flexibly adjusting the position of the liquid nitrogen distribution pipe 26 so that it sprays liquid nitrogen evenly along the outer wall of the coal sample carrying basket 52. This allows the annular liquid nitrogen distribution pipe 26 to uniformly freeze the coal sample in the carrying mechanism 5, causing the coal sample to become brittle. When the temperature sensor 11 detects that the temperature inside the freezing chamber 1 has dropped to -100℃, The electromagnetic flow valve 25 automatically reduces its opening to maintain a low-temperature environment, sending a signal to the control panel 8. During this period, the moisture in the coal sample freezes rapidly, significantly increasing the brittleness and reducing the toughness of the coal. During the freezing process, the nitrogen gas generated by the volatilization of liquid nitrogen is discharged through the exhaust valve 10 to prevent excessive pressure in the freezing chamber 1. Afterward, the coal sample is discharged from the freezing chamber 1 through the bearing mechanism 5 and the discharge mechanism 6 and falls into the crushing box 7. The two crushing rollers 13 then crush the brittle coal sample, thereby achieving low-temperature freezing and crushing of the coal sample. This device adopts the method of low-temperature freezing and brittle coal sample before crushing. Compared with the traditional jaw crusher, which crushes coal sample by squeezing, splitting and other mechanical forces, it greatly reduces the crushing energy consumption, effectively solves the problem of high energy consumption of traditional jaw crushers, and reduces dust pollution.

[0047] Example 2:

[0048] This embodiment is basically the same as the previous embodiment, except that the bearing mechanism 5 includes a fixed frame 51, a coal sample carrying basket 52, a flipping drive assembly 53, two second electric guide rails 54, and a sealing chamber door 55. The coal sample carrying basket 52 is installed between the inner walls of the two sides of the fixed frame 51 by bearings. The fixed frame 51 is a rectangular frame structure with certain strength and rigidity, which can bear the weight of the coal sample carrying basket 52 and the coal sample. The coal sample carrying basket 52 is provided with multiple mesh holes to facilitate the penetration of the low temperature medium and full contact with the surface of the coal sample, ensuring that the overall low temperature embrittlement of the coal sample is uniform. The flipping drive assembly 53 is installed in the middle of one end of the fixed frame 51. The flipping drive assembly 53 is a motor or driver and can be used to drive the coal sample carrying basket 52 to flip. The two second electric guide rails 54 are respectively installed on the outer walls of the two sides of the fixed frame 51. The second electric guide rails 54 are linear motion guide rails, and the ends of the two second electric guide rails 54 away from the fixed frame 51 are respectively installed in the middle of the inner walls of the two sides of the freezing chamber 1. The sealing chamber door 55 is installed at the other end of the fixed frame 51.

[0049] The bottom surface of the coal sample carrying basket 52 is set with an arc-shaped structure to avoid coal sample residue at the bottom of the coal sample carrying basket 52, and the coal sample carrying basket 52 will not come into contact with the liquid nitrogen diversion pipe 26 during the flipping process. The flipping drive component 53 and the second electric guide rail 54 are both electrically connected to the control panel 8. The control panel 8 can control the start and stop of the flipping drive component 53 and the operation of the second electric guide rail 54, which drives the fixed frame 51 and the coal sample carrying basket 52 and other components on it to enter and exit the freezing chamber 1. The sealing chamber door 55 is set with a convex structure and the sealing chamber door 55 is snapped with the inlet and outlet 12, so that the sealing chamber door 55 can better fit with the inlet and outlet 12 and improve the sealing performance. The sealing chamber door 55 is usually made of sealing materials such as rubber, which can effectively prevent cold air leakage in the freezing chamber 1.

[0050] Working principle: During operation, the control panel 8 controls the second electric guide rail 54 to move the fixed frame 51, so that the coal sample carrying basket 52 extends out of the freezing chamber 1 through the inlet and outlet 12. At this time, the liquid nitrogen diversion pipe 26 is located near the inlet and outlet 12 and will not affect the extension and retraction of the coal sample carrying basket 52. Then, the coal sample to be processed can be poured into the coal sample carrying basket 52, and the coal sample carrying basket 52 is returned to its original position by the second electric guide rail 54. At this time, the sealing chamber door 55 is engaged with the inlet and outlet 12 to ensure the sealing of the freezing chamber 1, prevent liquid nitrogen leakage, and improve the safety and reliability of the device. This allows the coal sample to fully contact the liquid nitrogen for freezing in the freezing chamber 1. After the coal sample is embrittled, the flipping drive component 53 drives the coal sample carrying basket 52 to flip, pouring the embrittled coal sample to the bottom of the freezing chamber 1, and guiding the coal sample to the discharge port 15 through the guide frame 14, which is beneficial for the subsequent discharge of the coal sample.

[0051] Example 3:

[0052] This embodiment is basically the same as the previous embodiment, except that the discharge mechanism 6 includes two positive and negative screws 61, two discharge drive components 62, four moving frames 63, two discharge plates 64 and two sealing strips 65. The two positive and negative screws 61 are installed between the inner walls of both sides of the crushing box 7 through bearings. The two discharge drive components 62 are respectively installed at one end of the two positive and negative screws 61. The discharge drive components 62 are motors or drivers that provide power for the rotation of the positive and negative screws 61. The four moving frames 63 are respectively threaded on both sides of the outer wall of the two positive and negative screws 61. The two discharge plates 64 are respectively installed between the tops of the front and rear moving frames 63. The two sealing strips 65 are respectively installed on the outer surface of the two discharge plates 64.

[0053] A guide frame 14 is installed around the bottom inner wall of the freezing chamber 1 to guide the crushed coal sample to the vicinity of the discharge port 15 so that the coal sample can be discharged in a concentrated manner. The discharge port 15 is opened in the middle of the bottom inner wall of the freezing chamber 1. Sealing grooves 16 are opened in the middle of the inner walls on both sides of the discharge port 15. Cleaning scrapers 17 are installed on the upper part of the inner walls on the other two sides of the discharge port 15.

[0054] The bottom surface of the cleaning scraper 17 contacts the top surface of the discharge plate 64. During the movement of the discharge plate 64, the cleaning scraper 17 can scrape off the coal sample remaining on the top surface of the discharge plate 64 to prevent material residue. The two discharge plates 64 are respectively movably inserted into the inner walls on both sides of the discharge port 15, which is conducive to the closing and opening of the two discharge plates 64. The sealing strip 65 is set with a U-shaped structure, and the sealing strip 65 is slidably connected to the two sealing grooves 16. This design can keep the seal during the movement of the discharge plate 64 and effectively prevent cold air leakage.

[0055] Working principle: When discharge is required, the control panel 8 controls the discharge drive assembly 62 to drive the positive and negative screws 61 to rotate. The rotation of the positive and negative screws 61 will drive the two moving frames 63 on them to move outward, thereby driving the two discharge plates 64 to move outward, thus opening the discharge port 15. The embrittled coal sample falls into the crushing box 7 through the discharge port 15 for crushing. During the opening and closing of the discharge plates 64, the cleaning scraper 17 can scrape off the coal sample remaining on the discharge plates 64, ensuring smooth discharge and cleanliness of the device. After discharge is completed, the discharge drive assembly 62 starts in reverse, driving the two discharge plates 64 to close. At this time, the sealing strip 65 slides and seals with the sealing groove 16, ensuring the sealing of the discharge port 15 and preventing coal sample leakage and the entry of external impurities when not discharging.

[0056] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An auxiliary device for coal quality testing and analysis, characterized in that, include: Freezing chamber (1); The freezing and crushing mechanism (2) is installed on the upper side of one end of the freezing chamber (1) and is used to deliver a low-temperature medium into the freezing chamber (1) to achieve low-temperature embrittlement of the coal sample; A liquid nitrogen storage tank (3) is installed at the other end of the cryogenic crushing mechanism (2); The freezing and crushing mechanism (2) includes a first electric guide rail (21), a moving block (22), a telescopic pipe (23), a cryogenic conveying pipe (24), an electromagnetic flow valve (25), and a liquid nitrogen diversion pipe (26). The first electric guide rail (21) is installed in the middle of the top inner wall of the freezing chamber (1). The moving block (22) is installed at the bottom end of the first electric guide rail (21). The liquid nitrogen diversion pipe (26) is installed at the bottom end of the moving block (22). The telescopic pipe (23) is installed on the upper side of one end of the liquid nitrogen diversion pipe (26) and is connected to it. The cryogenic conveying pipe (24) is installed on the other end of the telescopic pipe (23) and is connected to it. The other end of the cryogenic conveying pipe (24) is installed on the lower side of the outer wall of the liquid nitrogen storage tank (3) and is connected to it. The electromagnetic flow valve (25) is located in the middle of the outer wall of the cryogenic conveying pipe (24). The crushing box (7) is installed at the bottom center of the freezing chamber (1).

2. The auxiliary device for coal quality testing and analysis according to claim 1, characterized in that, Four tank support legs (4) are installed on the lower side of the outer wall of the liquid nitrogen storage tank (3). An inlet and outlet (12) is opened in the middle of the other end of the freezing chamber (1). The bearing mechanism (5) extends into the interior of the freezing chamber (1) through the inlet and outlet (12) and is pulled out along the inlet and outlet (12) to load and unload coal samples. A discharge mechanism (6) is installed inside the bottom cavity wall of the freezing chamber (1). A control panel (8) is installed in the middle of the outer wall of the freezing chamber (1).

3. The auxiliary device for coal quality testing and analysis according to claim 2, characterized in that, Support legs (9) are installed on both sides of the bottom end of the freezing chamber (1). A component is installed at each of the four corners of the top of the freezing chamber (1). An exhaust valve (10) is installed at two opposite corners, and a temperature sensor (11) is installed at the other two opposite corners. Two crushing rollers (13) are horizontally installed on the upper part of the inner wall of both sides of the crushing box (7) through bearings.

4. The auxiliary device for coal quality testing and analysis according to claim 2, characterized in that, The bearing mechanism (5) includes a fixed frame (51), a coal sample carrying basket (52), a flipping drive assembly (53), two second electric guide rails (54), and a sealing chamber door (55). The coal sample carrying basket (52) is installed between the inner walls of the two sides of the fixed frame (51) by bearings. The flipping drive assembly (53) is installed at the middle of one end of the fixed frame (51). The two second electric guide rails (54) are respectively installed on the outer walls of the two sides of the fixed frame (51), and the ends of the two second electric guide rails (54) away from the fixed frame (51) are respectively installed at the middle of the inner walls of the two sides of the freezing chamber (1). The sealing chamber door (55) is installed at the other end of the fixed frame (51).

5. The auxiliary device for coal quality testing and analysis according to claim 2, characterized in that, The discharge mechanism (6) includes two positive and negative screws (61), two discharge drive components (62), four moving frames (63), two discharge plates (64), and two sealing strips (65). The two positive and negative screws (61) are installed between the inner walls of the two sides of the crushing box (7) through bearings. The two discharge drive components (62) are respectively installed at one end of the two positive and negative screws (61). The four moving frames (63) are respectively threaded on both sides of the outer wall of the two positive and negative screws (61). The two discharge plates (64) are respectively installed between the tops of the front and rear moving frames (63). The two sealing strips (65) are respectively installed on the outer surface of the two discharge plates (64).

6. The auxiliary device for coal quality testing and analysis according to claim 5, characterized in that, The bottom inner wall of the freezing chamber (1) is equipped with a guide frame (14) around it. The bottom inner wall of the freezing chamber (1) is provided with a discharge port (15) in the middle. The inner walls on both sides of the discharge port (15) are provided with sealing grooves (16). The upper part of the inner walls on the other two sides of the discharge port (15) is provided with cleaning scrapers (17).

7. The auxiliary device for coal quality testing and analysis according to claim 2, characterized in that, The first electric guide rail (21) and the electromagnetic flow valve (25) are electrically connected to the control panel (8). The telescopic tube (23) is configured as a folded structure, the liquid nitrogen diversion tube (26) is configured as an annular structure, and multiple air outlets are opened on the inner side of the liquid nitrogen diversion tube (26).

8. The auxiliary device for coal quality testing and analysis according to claim 3, characterized in that, The bottom end face of the support leg (9) and the bottom end face of the storage tank support leg (4) are flush with the bottom end face of the crushing box (7). The temperature sensor (11) and the crushing roller (13) are electrically connected to the control panel (8). Multiple crushing tooth discs on the two crushing rollers (13) are staggered.

9. The auxiliary device for coal quality testing and analysis according to claim 4, characterized in that, The bottom surface of the coal sample carrying basket (52) is set as an arc structure. The flipping drive assembly (53) and the second electric guide rail (54) are both electrically connected to the control panel (8). The sealing cavity door (55) is set as a convex structure and the sealing cavity door (55) is engaged with the inlet and outlet (12).

10. An auxiliary device for coal quality testing and analysis according to claim 6, characterized in that, The bottom end of the cleaning scraper (17) contacts the top end of the discharge plate (64), and the two discharge plates (64) are movably inserted into the inner walls on both sides of the discharge port (15). The sealing strip (65) is set as a U-shaped structure, and the sealing strip (65) is slidably connected to the two sealing grooves (16).

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