Portable gas coal sample crushing and grinding device in coal mine and use method thereof

Abstract

The application discloses a portable gas coal sample crushing and grinding device in a coal mine and a use method thereof. The portable gas coal sample crushing and grinding device in a coal mine comprises a crushing and grinding tank fixing pipe, fixing bolts and a crushing and grinding tank. The fixing bolts are assembled on the outer wall of the crushing and grinding tank fixing pipe. The crushing and grinding tank is clamped and fixed in the crushing and grinding tank fixing pipe through the fixing bolts. The crushing and grinding tank is internally provided with crushing and grinding balls. The outer wall of the crushing and grinding tank fixing pipe is assembled with a fixing pipe male connector and a fixing pipe female connector. The device is simple, portable, and strong in environmental adaptability. The device is powered by a sampling drilling machine, is connected with a drill rod to realize stability, is crushed and ground while drilling, is connected with the drill rod when the drilling machine can operate, and can be used, thereby effectively avoiding the disadvantages of disconnection of desorption operations in a coal mine and on the ground, simplifying a coal seam gas content determination process and time, and providing favorable basic equipment conditions for realizing rapid desorption of gas content.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mine machinery, and particularly relates to a portable gas coal sample crushing and grinding device for underground coal mines and a use method. BACKGROUND

[0002] Conventional coal mine gas content determination operations are divided into underground desorption determination and ground desorption, underground determination operations are to load coal samples into a desorption tank, desorb gas for 60-120 min or more underground, and then take the desorption tank to the ground for secondary desorption, and after secondary desorption, the coal samples are placed into a ball mill to be crushed to a particle size of less than 0.25 mm, and then atmospheric natural desorption or degassing desorption is performed. The conventional desorption method separates underground desorption and ground desorption operations, and has long determination time, multiple operation processes, and many interference factors, and the process of taking the coal samples out of the desorption tank and placing them into the ball mill causes additional exposure time, and increases the risk of gas content determination error.

[0003] To realize underground rapid desorption of coal seam gas content, the problem of sealing and crushing coal samples underground needs to be solved, and existing underground crushing equipment is generally electric or pneumatic crushers, which cannot guarantee the sealing of the tank body during the crushing process, and the underground environment is complex, the crushing equipment needs to be explosion-proof, the existing equipment is large in size and inconvenient to carry, and cannot adapt to the narrow operation space and complex operation environment underground. SUMMARY

[0004] To solve the above problems, the application provides a portable gas coal sample crushing and grinding device for underground coal mines and a use method.

[0005] To achieve the above purpose, the technical scheme adopted by the application is as follows: a portable gas coal sample crushing and grinding device for underground coal mines is assembled on a drill rod, and comprises a crushing and grinding tank fixing pipe, fixing bolts and a crushing and grinding tank, a plurality of fixing bolts are assembled on the outer wall of the crushing and grinding tank fixing pipe, the crushing and grinding tank is clamped and fixed in the crushing and grinding tank fixing pipe through the fixing bolts, crushing and grinding balls are placed in the crushing and grinding tank, a male joint of the fixing pipe and a female joint of the fixing pipe are assembled on the outer wall of the crushing and grinding tank fixing pipe, and the crushing and grinding tank fixing pipe is assembled on the drill rod through the male joint of the fixing pipe and the female joint of the fixing pipe.

[0006] Further, the fixed tube of the crushing and grinding jar comprises a fixed tube body, a fixed tube cover plate, a fixed tube connecting shaft and a fixed tube lock, the fixed tube body and the fixed tube cover plate are both semi-cylindrical cylinder structures, and the two ends of the fixed tube body are integrally formed with circular end covers, the fixed tube male connector and the fixed tube female connector are integrally formed on the circular end covers respectively, and the fixed tube male connector and the fixed tube female connector are coaxial with the fixed tube of the crushing and grinding jar and the drill rod, the fixed tube connecting shaft is assembled between the fixed tube body and the fixed tube cover plate, the outer end of the fixed tube cover plate is assembled with the fixed tube lock, and the outer end of the fixed tube body is provided with a lock groove matched with the fixed tube lock.

[0007] Further, the crushing and grinding jar comprises a grinding jar body, a grinding jar cover, a needle hole sealing rubber ring, a metal gasket and a needle hole screw, the grinding jar cover is screwed on the grinding jar body, the opening end of the grinding jar body is fixedly installed with the grinding jar cover sealing rubber ring in the grinding jar cover, the outer end of the grinding jar cover is provided with a threaded groove, the inner wall of the threaded groove is provided with a needle hole, the needle hole sealing rubber ring and the metal gasket are placed in the threaded groove, and the metal gasket is located on the upper side of the needle hole sealing rubber ring, and the needle hole screw is screwed in the threaded groove, and the surface of the needle hole screw is provided with a needle hole screw groove.

[0008] Further, the side wall of the fixed tube of the crushing and grinding jar is fixedly installed with a crankshaft drill rod, and the fixed tube is assembled at the crankshaft of the crankshaft drill rod, and the fixed tube male connector and the fixed tube female connector are respectively arranged at the two ends of the crankshaft drill rod.

[0009] The use method of the coal mine underground portable gas coal sample crushing and grinding device comprises the following steps:

[0010] Step one, preparation, number and weigh a plurality of crushing and grinding jars, and record the total weight M of the crushing and grinding jar and the crushing and grinding ball g Insert the needle into the needle hole in the grinding jar cover, and place the grinding jar cover and the grinding jar body separately, and place the crushing and grinding balls in the grinding jar body for standby;

[0011] Step two, pre-crushing desorption operation, take out the coal sample from the coal seam drilling hole of the coal wall by the drilling machine, complete the sampling work, record the start sampling time, immediately put the coal sample into two crushing and grinding jars, cover the grinding jar cover and tighten it, connect the hose of the gas content desorption instrument with the needle, start the pre-crushing desorption operation, record the start desorption time, and the desorption time T1 is 10 min, wherein the coal sample exposure time T0 is the difference between the start desorption time and the start sampling time, and record the pre-crushing desorption data W after the desorption is completed. qj , calculate the gas loss amount W of the coal sample exposure by the pre-crushing desorption data W qj , the desorption time T1 and the coal sample exposure time T0.ss ;

[0012] After desorption is completed, the needle is pulled out, the needle hole screw is tightened by using a screwdriver through the needle hole screw groove, the broken grinding jar is sealed, the broken grinding jar is weighed, and the total weight M of the broken grinding jar and the broken grinding balls and the coal sample is recorded q ;

[0013] Step three, install the broken grinding jar fixing pipe, when the pre-crushing desorption operation is performed, the drill pipe on the drilling machine is retracted, the broken grinding jar fixing pipe is installed on the connecting drill pipe female joint and the connecting drill pipe male joint through the fixing pipe male joint and the fixing pipe female joint, and the broken grinding jar fixing pipe is located between the drilling machine and the drill hole;

[0014] Step four, crushing and grinding, after the pre-crushing desorption operation is completed and the installation of the broken grinding jar fixing pipe is completed, the broken grinding jar is firmly installed in the broken grinding jar fixing pipe, then the drilling machine is started, the broken grinding jar fixing pipe and the broken grinding jar are rotated under the driving of the drill pipe, the broken grinding balls rotate together with the coal sample in the broken grinding jar, and the broken grinding balls crush and grind the coal sample under the action of gravity, friction force and impact force. The crushing and grinding time is 10 minutes;

[0015] Step five, first crushing and desorption, after the grinding is completed, the broken grinding jar is taken out from the broken grinding jar fixing pipe, the needle hole screw is loosened, the needle with the rubber tube is inserted into the needle hole, the broken grinding jar is connected with the gas content desorption instrument through the needle hole sealing rubber ring, the first crushing and desorption is started, and the first crushing and desorption data W is recorded pj1 After desorption for 5 minutes, the needle is pulled out, and the needle hole screw is tightened;

[0016] Step six, cyclic crushing and desorption, the second crushing and grinding is performed by repeating steps three to five, the crushing and grinding time is 5 minutes, the second crushing and desorption is started after crushing, and the second crushing and desorption data W is recorded pj2 Then the cyclic crushing and grinding is continued until the crushing is ended after each desorption amount is less than 5 ml, and the crushing and desorption data W is recorded pjn ;

[0017] Step seven, measuring the coal seam gas content, according to the normal pressure natural desorption method in the GB / T23250-2009 coal seam gas content underground direct measurement method, the desorbable gas content W of the coal seam is measured jx According to the following formula:

[0018] W jx =(W ss +W qj +W pj1 +W pj2 …+W pjn ) / (M q -Mg ) (1)

[0019] The coal seam gas content W is calculated according to the following formula:

[0020] W = W jx + W C (2)

[0021] In the formula:

[0022] W jx is the desorbable gas content, unit m 3 / t;

[0023] W ss is the lost gas content, unit m 3 / t;

[0024] W qj is the desorption amount before crushing, unit ml;

[0025] W pj1 is the desorption amount after the first crushing, unit ml;

[0026] W pj2 is the desorption amount after the second crushing, unit ml;

[0027] W pjn is the desorption amount after the nth crushing, unit ml;

[0028] M g is the total weight of the crushing and grinding tank and the crushing and grinding ball, unit g;

[0029] M q is the total weight of the crushing and grinding tank, the crushing and grinding ball and the coal sample, unit g;

[0030] W C is the theoretically calculated non-desorbable amount under normal pressure, unit m 3 / t.

[0031] Further, in step two, the sampling method is air exhaust sampling, fixed point sampling or corer sampling.

[0032] Further, in step two, the coal sample with large coal block particle size is crushed to below 25 mm and then put into the crushing and grinding tank.

[0033] Further, in step four, the coal sample is crushed to 95% of the coal sample passing through the 60 mesh sample separation screen.

[0034] The beneficial effects of using the present application are:

[0035] The device is simple, portable, and strong in environment adaptation, utilizes a sampling drilling machine to provide power, realizes stability by being connected with a drill rod, and is broken and ground while drilling, so that the device can be connected with the drill rod when the drilling machine can operate, and the device can be used, the disadvantages of disconnection of desorption operation in a well and on the ground are avoided, the coal seam gas content determination process and time are simplified, and favorable basic equipment conditions are provided for realizing rapid desorption of gas content. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 Fig. 1 is a structural schematic diagram of a portable gas coal sample breaking and grinding device in an embodiment of the present application.

[0037] Figure 2 Fig. 2 is a structural schematic diagram of a fixed tube of a breaking and grinding tank in the portable gas coal sample breaking and grinding device. Figure 1

[0038] Figure 3 Fig. 3 is a structural schematic diagram of the breaking and grinding tank in the portable gas coal sample breaking and grinding device.

[0039] Figure 4 Fig. 4 is a disassembled structural schematic diagram of the breaking and grinding tank.

[0040] Figure 5 Fig. 5 is a structural schematic diagram of a needle hole sealing rubber ring, a metal gasket, and a needle hole screw on a grinding tank cover.

[0041] Figure 6 Fig. 6 is an installation schematic diagram of the portable gas coal sample breaking and grinding device in the embodiment of the present application.

[0042] Figure 7 Fig. 7 is a connection schematic diagram of a gas content desorption instrument and the breaking and grinding tank.

[0043] Figure 8 Fig. 8 is a structural schematic diagram of a portable gas coal sample breaking and grinding device in an embodiment of the present application.

[0044] Figure 9 Fig. 9 is an installation schematic diagram of the portable gas coal sample breaking and grinding device in the embodiment of the present application.

[0045] ​The reference signs include: 1, portable gas coal sample crushing and grinding device, 2, crushing and grinding tank fixing pipe, 2-1, fixing pipe body, 2-2, fixing pipe cover plate, 2-3, fixing pipe connecting shaft, 2-4, fixing pipe lock catch, 3, fixing bolt, 4, crushing and grinding tank, 4-1, grinding tank body, 4-2, grinding tank cover, 4-3, grinding tank cover sealing rubber ring, 4-4, pinhole sealing rubber ring, 4-5, metal gasket, 4-6, pinhole screw, 4-7, pinhole screw groove, 4-8 pinhole, 5, fixing pipe male connector, 6, fixing pipe female connector, 7, crushing and grinding ball, 8, connecting drill rod female connector, 9, connecting drill rod male connector, 10, drilling machine, 11, drill bit, 12, drill hole, 13, coal wall, 14, needle, 15, rubber tube, 16, gas content desorption instrument, 17, crankshaft drill rod. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0047] Embodiment one

[0048] Reference Figures 1 to 6 The portable gas coal sample crushing and grinding device is assembled on the drill rod, the crushing and grinding tank fixing pipe 2, the fixing bolt 3 and the crushing and grinding tank 4, a plurality of fixing bolts 3 are assembled on the outer wall of the crushing and grinding tank fixing pipe 2, the crushing and grinding tank 4 is clamped and fixed in the crushing and grinding tank fixing pipe 2 through the fixing bolt 3, the crushing and grinding ball 7 is placed in the crushing and grinding tank 4, the crushing and grinding tank fixing pipe 2 is assembled on the drill rod through the fixing pipe male connector 5 and the fixing pipe female connector 6.

[0049] The crushing and grinding tank fixing pipe 2, the fixing bolt 3, the crushing and grinding tank 4, the fixing pipe male connector 5, the fixing pipe female connector 6 and the crushing and grinding ball 7 are assembled to form the portable gas coal sample crushing and grinding device 1.

[0050] The crushing and grinding tank 4 is fixed in the crushing and grinding tank fixing pipe 2 by the fixing bolt 3, so that the crushing and grinding tank 4 can rotate with the crushing and grinding tank fixing pipe 2.

[0051] The fixing pipe male connector 5 and the fixing pipe female connector 6 are respectively used for connecting with the connecting drill rod female connector 8 and the connecting drill rod male connector 9 on the drill rod of the drilling machine 10, so as to realize the installation of the crushing and grinding tank fixing pipe 2 on the drilling machine 10, and enable the drilling machine 10 to drive the crushing and grinding tank fixing pipe 2 to rotate.

[0052] The end of the drill pipe is drill bit 11.

[0053] In practical use, the fixed tube 2 of the crushing and grinding tank can be designed to be of different lengths and can be designed to accommodate single tanks, double tanks, triple tanks, etc.

[0054] In addition, the fixed tube 2 of the crushing and grinding tank can also be designed in the form of a planetary gear system. The drill rod connecting shaft is the sun gear, and multiple crushing and grinding tanks 4 located inside the fixed tube 2 of the crushing and grinding tank form a planetary gear. After the drill rod rotates, it runs and crushes according to the planetary trajectory.

[0055] In practical use, the male connector 5 and the female connector 6 of the fixed pipe can be designed according to the different thread types of the drill pipe model to increase the applicability of the equipment.

[0056] Specifically, such as Figure 2 As shown, the fixed pipe 2 of the crushing and grinding tank includes a fixed pipe body 2-1, a fixed pipe cover plate 2-2, a fixed pipe connecting shaft 2-3, and a fixed pipe buckle 2-4. Both the fixed pipe body 2-1 and the fixed pipe cover plate 2-2 are semi-cylindrical structures, and both ends of the fixed pipe body 2-1 are integrally formed with circular end caps. The fixed pipe male connector 5 and the fixed pipe female connector 6 are integrally formed on the circular end caps, and the fixed pipe male connector 5, the fixed pipe female connector 6, the crushing and grinding tank fixed pipe 2, and the drill rod are coaxial. The fixed pipe connecting shaft 2-3 is assembled between the fixed pipe body 2-1 and the fixed pipe cover plate 2-2. The fixed pipe buckle 2-4 is assembled on the outer end of the fixed pipe cover plate 2-2, and the outer end of the fixed pipe body 2-1 is provided with a locking groove that matches the fixed pipe buckle 2-4.

[0057] Specifically, such as Figures 3 to 5 As shown, the crushing and grinding tank 4 includes a grinding tank body 4-1, a grinding tank cover 4-2, a pinhole sealing ring 4-4, a metal gasket 4-5, and a pinhole screw 4-6. The grinding tank cover 4-2 is screwed onto the grinding tank body 4-1. The opening end of the grinding tank body 4-1 is located inside the grinding tank cover 4-2 and a grinding tank cover sealing ring 4-3 is fixedly installed thereon. The outer end of the grinding tank cover 4-2 has a threaded groove, and the inner wall of the threaded groove has a pinhole 4-8. The pinhole sealing ring 4-4 ​​and the metal gasket 4-5 are placed in the threaded groove, and the metal gasket 4-5 is located on the upper side of the pinhole sealing ring 4-4. The pinhole screw 4-6 is screwed into the threaded groove, and the surface of the pinhole screw 4-6 has a pinhole screw groove 4-7.

[0058] Example 2

[0059] The method of using the portable gas and coal sample crushing and grinding device in underground coal mines, using the portable gas and coal sample crushing and grinding device in Example 1, specifically includes the following steps:

[0060] Step one, preparation, number and weigh the multiple broken grinding pots 4, record the total weight M of the broken grinding pot 4 and the broken grinding ball 7 g Insert the needle 14 into the needle hole 4-8 in the grinding pot cover 4-2, and place the grinding pot cover 4-2 and the grinding pot body 4-1 separately, and place the broken grinding ball 7 in the grinding pot body 4-1 for standby;

[0061] Step two, desorption before crushing, the coal sample is taken out from the coal seam drill hole 12 of the coal wall 13 by the drilling machine 10, and the sampling work is completed, and the starting sampling time is recorded, then the coal sample is immediately loaded into two broken grinding pots 4, the grinding pot cover 4-2 is covered and tightened, the rubber tube 15 of the gas content desorption instrument 16 is connected with the needle 14, and the desorption before crushing is started, and the starting desorption time is recorded, the desorption time T1 is 10 min, wherein the coal sample exposure time T0 is the difference between the starting desorption time and the starting sampling time, and the desorption data W before crushing is recorded after desorption qj , the desorption data W before crushing qj , the desorption time T1, and the coal sample exposure time T0 are used to calculate the gas loss W of the coal sample during exposure ss ;

[0062] After desorption, the needle 14 is pulled out, the screwdriver is used to tighten the needle hole screw 4-6 through the needle hole screw groove 4-7, the broken grinding pot 4 is sealed, the broken grinding pot 4 is weighed, and the total weight M of the broken grinding pot 4, the broken grinding ball 7 and the coal sample is recorded q ;

[0063] As shown in Figure 7 , it is a connection diagram of the gas content desorption instrument 16 and the broken grinding pot 4, and the desorption work is completed by the gas content desorption instrument 16;

[0064] Specifically, the sampling method is air displacement sampling, fixed point sampling or coring sampling;

[0065] Specifically, the coal sample with large coal block particle size is crushed to below 25 mm and then put into the broken grinding pot 4;

[0066] Step three, install the broken grinding pot fixing pipe 2, when the desorption before crushing is performed, the drill rod on the drilling machine 10 is retracted, the broken grinding pot fixing pipe 2 is installed on the connecting drill rod female connector 8 and the connecting drill rod male connector 9 through the fixing pipe male connector 5 and the fixing pipe female connector 6, so that the broken grinding pot fixing pipe 2 is located between the drilling machine and the drill hole 12, and the stability of the equipment is maintained;

[0067] Step four, broken grinding, desorption operation is completed before the broken, and the broken grinding tank fixed tube 2 is installed, the broken grinding tank 4 is firmly installed in the broken grinding tank fixed tube 2, then the drilling machine 10 is started, the broken grinding tank fixed tube 2, the broken grinding tank 4 is rotated under the driving of the drill rod, the broken grinding ball 7 rotates with the coal sample in the broken grinding tank 4, the broken grinding ball 7 is broken and ground under the action of gravity, friction and impact force, and the broken grinding time is 10 min;

[0068] When installing the broken grinding tank 4, first open the fixed tube lock buckle 2-4, lift the fixed tube cover plate 2-2, loosen the fixed bolt 3, put the two sealed broken grinding tanks 4 into the broken grinding tank fixed tube 2, cover the fixed tube cover plate 2-2, lock the fixed tube lock buckle 2-4, and tighten the fixed bolt 3, which can ensure that the broken grinding tank 4 is firmly installed;

[0069] Specifically, the coal sample is crushed to 95% of the coal sample passing through the 60 mesh sample separation sieve;

[0070] The specific grinding time is determined according to the coal quality characteristics, coring method and the like of each mine;

[0071] Step five, first broken desorption, after grinding, the broken grinding tank 4 is taken out from the broken grinding tank fixed tube 2, the needle hole screw 4-6 is loosened, the needle 14 with the rubber tube 15 is inserted into the needle hole 4-8, the needle hole sealing rubber ring 4-4 is passed through, the broken grinding tank 4 is connected with the gas content desorption instrument 16, the first broken desorption is started, and the first broken desorption data W pj1 is recorded, the needle 14 is pulled out after desorption for 5 min, and the needle hole screw 4-6 is tightened;

[0072] Step six, cyclic broken desorption, the second broken grinding is repeated from step three to step five, the broken grinding time is 5 min, the second broken desorption is started after the broken, the second broken desorption data W pj2 is recorded, and then the cyclic broken grinding is continued until the broken is ended after each desorption amount is less than 5 ml, and each broken desorption data W pjn is recorded;

[0073] The second broken grinding and the subsequent broken grinding time are both 5 min;

[0074] Step seven, measuring coal seam gas content, according to the normal pressure natural desorption method in GB / T23250-2009 coal seam gas content underground direct measurement method, the desorbable gas content W jx of the coal seam is calculated according to the following formula:

[0075] W jx =(W ss +W qj +W pj1+W pj2 …..+W pjn ) / (M q -M g ) (1)

[0076] The gas content W of the coal seam is calculated according to the following formula:

[0077] W=W jx +W C (2)

[0078] In the formula:

[0079] W jx —Desorbable gas content, unit m 3 / t;

[0080] W ss —Loss gas content, unit m 3 / t;

[0081] W qj —Desorption amount before crushing, unit ml;

[0082] W pj1 —Desorption amount after the first crushing, unit ml;

[0083] W pj2 —Desorption amount after the second crushing, unit ml;

[0084] W pjn —Desorption amount after the nth crushing, unit ml;

[0085] M g —Total weight of the crushing and grinding tank and the crushing and grinding ball, unit g;

[0086] M q —Total weight of the crushing and grinding tank, the crushing and grinding ball, and the coal sample, unit g;

[0087] W C —Theoretically calculated non-desorbable amount under normal pressure, unit m 3 / t.

[0088] Example Three

[0089] The difference from Example One is that:

[0090] Specifically, as shown in Figure 8 and Figure 9 , the side wall of the crushing and grinding tank fixing pipe 2 is fixedly installed with a crank drill rod 17, and the crushing and grinding tank fixing pipe 2 is assembled at the crank shaft of the crank drill rod 17, and the fixed pipe male joint 5 and the fixed pipe female joint 6 are respectively arranged at both ends of the crank drill rod 17.

[0091] The crank drill rod 17 is connected with the drill rod of the drilling machine 10, and the strength of the crank drill rod 17 is greater than that of the crushing and grinding tank fixed pipe 2, so that the drilling machine 10 can simultaneously perform drilling work during the crushing and grinding work of the coal sample, and the crushing and grinding tank 4 is different in shaft from the drill rod of the drilling machine 10, so that the crushing and grinding tank 4 has a greater moving radius, and the movement track of the crushing and grinding ball 7 can more effectively crush and grind the coal sample.

[0092] In this embodiment, the crushing and grinding tank fixed pipe 2 is connected with the connecting drill rod female joint 8 and the connecting drill rod male joint 9 on the drill rod of the drilling machine 10 through the fixed pipe male joint 5 and the fixed pipe female joint 6 at both ends of the crank drill rod 17, so as to realize the installation of the crushing and grinding tank fixed pipe 2.

[0093] The above is only the preferred embodiment of the present application, and for those skilled in the art, many changes can be made in the specific implementation and application range according to the idea of the present application, as long as these changes do not deviate from the concept of the present application, and all belong to the protection scope of the present application.

Claims

1. A portable gas and coal sample crushing and grinding device for underground coal mines, mounted on a drill rod, characterized in that: The broken grinding pot fixing pipe (2), the fixing bolt (3) and the broken grinding pot (4) are provided, a plurality of fixing bolts (3) are assembled on the outer wall of the broken grinding pot fixing pipe (2), the broken grinding pot (4) is clamped and fixed in the broken grinding pot fixing pipe (2) through the fixing bolt (3), the inside of the broken grinding pot (4) is placed with the broken grinding ball (7), the outer wall of the broken grinding pot fixing pipe (2) is assembled with the fixing pipe male connector (5) and the fixing pipe female connector (6), and the broken grinding pot fixing pipe (2) is assembled on the drill rod through the fixing pipe male connector (5) and the fixing pipe female connector (6), so that the drilling machine can drive the broken grinding pot fixing pipe (2) to rotate, and the broken grinding while drilling is realized.

2. The portable coal sample crushing and grinding device for underground coal mine according to claim 1, characterized in that: The broken grinding pot fixing pipe (2) comprises a fixing pipe body (2-1), a fixing pipe cover plate (2-2), a fixing pipe connecting shaft (2-3) and a fixing pipe lock buckle (2-4), the fixing pipe body (2-1) and the fixing pipe cover plate (2-2) are both half-cylindrical cylinder structures, and the two ends of the fixing pipe body (2-1) are integrally formed with circular end covers, the fixing pipe male connector (5) and the fixing pipe female connector (6) are integrally formed on the circular end covers respectively, and the fixing pipe male connector (5), the fixing pipe female connector (6), the broken grinding pot fixing pipe (2) and the drill rod are coaxial, the fixing pipe connecting shaft (2-3) is assembled between the fixing pipe body (2-1) and the fixing pipe cover plate (2-2), the outer end of the fixing pipe cover plate (2-2) is assembled with the fixing pipe lock buckle (2-4), and the outer end of the fixing pipe body (2-1) is provided with a lock groove matched with the fixing pipe lock buckle (2-4).

3. The portable coal sample crushing and grinding device for underground coal mine according to claim 2, characterized in that: The broken grinding pot (4) comprises a grinding pot body (4-1), a grinding pot cover (4-2), a pinhole sealing rubber ring (4-4), a metal gasket (4-5) and a pinhole screw (4-6), and the grinding pot cover (4-2) is screwed on the grinding pot body (4-1), the opening end of the grinding pot body (4-1) is fixedly installed with a grinding pot cover sealing rubber ring (4-3) in the grinding pot cover (4-2), the outer end of the grinding pot cover (4-2) is provided with a threaded groove, the inner wall of the threaded groove is provided with a pinhole (4-8), the pinhole sealing rubber ring (4-4) and the metal gasket (4-5) are placed in the threaded groove, and the metal gasket (4-5) is located on the upper side of the pinhole sealing rubber ring (4-4), the pinhole screw (4-6) is screwed in the threaded groove, and the surface of the pinhole screw (4-6) is provided with a pinhole screw groove (4-7).

4. The portable coal sample crushing and grinding device for underground coal mine according to claim 1, characterized in that: The side wall of the broken grinding pot fixing pipe (2) is fixedly installed with a crankshaft drill rod (17), and the broken grinding pot fixing pipe (2) is assembled at the crankshaft of the crankshaft drill rod (17), and the fixing pipe male connector (5) and the fixing pipe female connector (6) are respectively arranged at the two ends of the crankshaft drill rod (17).

5. The use method of the portable gas coal sample broken grinding device in the coal mine, which utilizes the portable gas coal sample broken grinding device in the coal mine in claim 3, and specifically comprises the following steps: Step one, preparation, number and weigh a plurality of broken grinding pots (4), record the total weight M of the broken grinding pot (4) and the broken grinding ball (7) g Insert the needle (14) into the needle hole (4-8) in the grinding pot cover (4-2), and place the grinding pot cover (4-2) and the grinding pot body (4-1) separately, and place the broken grinding ball (7) in the grinding pot body (4-1) for standby; Step two, pre-crushing desorption operation, the coal sample is taken out from the coal seam of the coal wall (13) by the drilling machine (10) to complete the sampling work, and the starting sampling time is recorded, then the coal sample is immediately loaded into two crushing and grinding tanks (4), the grinding tank cover (4-2) is covered and tightened, the rubber tube (15) of the gas content desorption instrument (16) is connected with the needle (14), the pre-crushing desorption operation is started, and the starting desorption time is recorded, the desorption time T1 is 10 min, wherein the coal sample exposure time T0 is the difference between the starting desorption time and the starting sampling time, and the pre-crushing desorption data W is recorded after the desorption is completed qj , the pre-crushing desorption data W qj , the desorption time T1, and the coal sample exposure time T0 are used to calculate the gas loss amount W of the coal sample during the exposure ss ; After desorption is completed, the needle (14) is pulled out, the needle hole screw (4-6) is tightened by using a screwdriver through the needle hole screw groove (4-7), the broken grinding tank (4) is kept sealed, the broken grinding tank (4) is weighed, and the total weight M of the broken grinding tank (4) and the broken grinding ball (7), the coal sample is recorded q ; Step three, install the crushing grinding tank fixing pipe (2), when desorption before crushing, withdraw the drill pipe on the drilling machine (10), install the crushing grinding tank fixing pipe (2) on the connecting drill pipe female joint (8) and the connecting drill pipe male joint (9) through the fixing pipe male joint (5) and the fixing pipe female joint (6), so that the crushing grinding tank fixing pipe (2) is located between the drilling machine and the drill hole (12); Step four, crushing and grinding, after the desorption before crushing operation is completed and the crushing grinding tank fixing pipe (2) is installed, install the crushing grinding tank (4) firmly in the crushing grinding tank fixing pipe (2), then start the drilling machine (10), so that the crushing grinding tank fixing pipe (2) and the crushing grinding tank (4) rotate under the driving of the drill pipe, the crushing grinding balls (7) rotate with the coal sample in the crushing grinding tank (4), the crushing grinding balls (7) crush and grind the coal sample under the action of gravity, friction and impact force, and the crushing and grinding time is 10 minutes; Step five, the first time broken desorption, after grinding is completed, the broken grinding tank (4) is taken out from the broken grinding tank fixed pipe (2), the needle hole screw (4-6) is unscrewed, the needle (14) with the rubber tube (15) is inserted into the needle hole (4-8), passes through the needle hole sealing rubber ring (4-4), the broken grinding tank (4) is communicated with the gas content desorption instrument (16), the first time broken desorption is started, and the first time broken desorption data W is recorded. pj1 After desorption for 5 min, the needle (14) is pulled out, and the needle hole screw (4-6) is screwed. Step six, cycle crushing desorption, repeat step three to step five for the second crushing grinding, the crushing grinding time is 5 min, after crushing, start the second crushing desorption, record the second crushing desorption data W pj2 , then continue to cycle crushing grinding until the desorption amount of each time is less than 5 ml, and then end the crushing, record the desorption data W of each crushing pjn ; Step seven, measure the gas content of coal seam, according to the normal pressure natural desorption method in GB / T23250-2009 Coal Seam Gas Content Underground Direct Measurement Method, the desorbable gas content W of coal seam jx is calculated according to the following formula: W jx =(W ss +W qj +W pj1 +W pj2 …..+W pjn ) / (M q -M g ) (1) The coal seam gas content W is calculated according to the following formula: W = W jx + W C (2) In step two, the sampling methods are air displacement sampling, fixed point sampling or coring device sampling. W jx desorbable gas content, unit m 3 / t; W ss Loss of gas content, in m 3 / t; W qj Desorption amount before crushing, unit: ml; W pj1 Desorption after first crushing, in ml; W pj2 Desorption amount after second crushing, unit: ml W pjn desorption amount after n-th crushing, unit: ml; M g - total weight of the crushing mill jar and the crushing mill balls, in g; M q - total weight of the crushing grinding pot and the crushing grinding balls, the coal sample, in g; W C - Theoretical calculated non-desorbable amount at normal pressure, unit m 3 / t.

6. The use method of the coal mine underground portable gas coal sample crushing and grinding device in claim 5, characterized in that: In step two, the coal sample is crushed to less than 25 mm before being put into the crushing grinding tank (4).

7. The use method of the portable gas coal sample crushing and grinding device in coal mine underground as claimed in claim 5, characterized in that: In step four, the coal sample is crushed to 95% of the coal sample passing through a 60-mesh sample separation screen.

8. The use method of the portable gas coal sample crushing and grinding device in coal mine underground as claimed in claim 5, characterized in that: ​

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