Sleeve type fixed-point sampling device for measuring drilling cuttings indexes

Abstract

The utility model discloses a sleeve type fixed-point sampling device for measuring drilling cuttings indexes, a first spring pin male joint of a sampling device adapter is arranged at the left end of an adapter body, a first spring pin female joint is arranged at the right end of the adapter body, and the upper side and the lower side of the adapter body are respectively provided with a fixed column; a first fixing groove and a first external thread are arranged at the left end of a first pipe body of the head pipe, a second external thread and a second fixing groove are arranged at the left end of a second pipe body of the common pipe, and an internal thread is arranged at the right end of the second pipe body. A second spring pin male connector of the twist drill rod is arranged at the left end of a drill rod body, a second spring pin female connector is arranged at the right end of the drill rod body, and drill rod threads are arranged on the outline of the outer surface of the drill rod body. Through cooperative use of the drilling assembly, the sleeve assembly and the adapter, fixed-point sampling in the drilling cuttings index measuring process can be achieved, the accuracy of the drilling cuttings index measuring value is improved, the risks of hole collapse, drill rod falling and the like can be reduced, and the sampling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coal mine safety production, concretely relates to a casing pipe type fixed point sampling device for drilling cutting index determination. BACKGROUND

[0002] Coal and gas outburst accidents have high frequency, large outburst intensity, serious harm and wide distribution. With the increasing of mining depth of the mine in China, the ground stress increases, and the gas pressure gradually rises, which makes the danger of coal and gas outburst significantly increase. At present, the most commonly used method for predicting the outburst danger of the coal roadway driving face in the coal mine is the drilling cutting index method. The drilling cutting index parameters in the method include the drilling cutting gas desorption index (△h2, K1) and the drilling cutting quantity index S value. The drilling cutting gas desorption index (△h2, K1) is determined by measuring the desorption amount or desorption speed of the gas in the drilling cutting within a certain time, so as to judge the occurrence state and diffusion characteristics of the gas in the coal body. The drilling cutting quantity index S value reflects the broken degree of the coal body and the ground stress state. The drilling cutting index method can determine the drilling cutting quantity index and the drilling cutting gas desorption index at the same time. However, the method also exposes some problems in the actual operation process in the mine, and the specific problems are as follows:

[0003] (1) When the drilling cutting index method is used for determination, it is required to use a φ42mm twist drill rod to construct a drilling hole. During the drilling process, the drilling cutting is collected and the S value is determined once every 1m of drilling. The drilling cutting with the particle size of 1-3mm is collected and sieved every 2m of drilling. The K1 or △h2 index is determined once according to the instrument operation process. However, under the existing equipment and determination process conditions, the coal cutting mixed in the collected coal sample due to the impact damage of the drilling rod swing on the hole wall, the soft coal body and other factors during the drilling process, the serious mixing of the coal sample along the hole wall and the coal sample at the required sampling depth, the failure to accurately obtain the coal sample at the specific depth, the drilling cutting index determined by the mixed coal sample, and the large measurement error of the drilling cutting index, the outburst danger of the coal body cannot be accurately predicted, and the safety hidden danger for the occurrence of the gas outburst accident is caused.

[0004] (2) Due to the swing and impact of the drilling machine and the drilling rod during the construction process, the soft coal seam frequently collapses during the drilling process. The drilling cutting blocks the drilling hole, the drilling rod cannot continue to drill, and the "drilling sticking" phenomenon frequently occurs, so that the drilling operation cannot continue.

[0005] (3) During the drilling construction process, the drilling cutting index measurement fails due to the failure to retreat the drilling rod after the collapse and the drilling sticking phenomenon.

[0006] Therefore, a casing type fixed-point sampling device for drilling cuttings index determination is needed, which can realize fixed-point sampling, improve the accuracy of drilling cuttings index measurement, improve the accuracy of coal seam outburst danger prediction, provide support for mine gas outburst prevention and control work, and lay a foundation for mine safety production. Utility model content

[0007] The casing type fixed-point sampling device for drilling cuttings index determination can realize fixed-point sampling, improve the accuracy of drilling cuttings index measurement, and improve the accuracy of coal seam outburst danger prediction. Through the cooperation of the drilling assembly, the casing assembly and the adapter, fixed-point sampling in the drilling cuttings index determination process can be realized, the accuracy of drilling cuttings index measurement can be improved, and the risks of hole collapse, drill sticking and drill rod falling can be reduced, thereby improving the sampling efficiency.

[0008] To solve the above technical problems, the utility model adopts the following technical scheme:

[0009] A casing type fixed-point sampling device for drilling cuttings index determination, comprising a drilling assembly, a casing assembly and an adapter, the adapter comprising an adapter body, a first spring pin male connector, a first spring pin female connector and a fixing column, the first spring pin male connector being arranged at the left end of the adapter body, the first spring pin female connector being arranged at the right end of the adapter body, and one fixing column being arranged on each of the upper and lower sides of the adapter body;

[0010] The casing assembly comprises a head pipe and a plurality of ordinary pipes. The head pipe comprises a first pipe body, a first external thread and a first fixing groove. The left end of the first pipe body is provided with the first fixing groove and the first external thread. The ordinary pipe comprises a second pipe body, a second external thread, a second fixing groove and an internal thread. The left end of the second pipe body is provided with the second external thread and the second fixing groove. The right end of the second pipe body is provided with the internal thread.

[0011] The drilling assembly comprises a plurality of twist drill rods and a drill bit arranged at the right end of the rightmost drill rod. The twist drill rod comprises a drill rod body, a second spring pin male connector, a second spring pin female connector and a drill rod thread. The second spring pin male connector is arranged at the left end of the drill rod body. The second spring pin female connector is arranged at the right end of the drill rod body. The drill rod thread is arranged on the outer surface profile of the drill rod body.

[0012] The drill bit comprises a cutting edge. The cutting edge is provided with a cutting groove with an opening facing right. The right end of the cutting edge is a sharp structure. The left end of the cutting edge is provided with a third spring pin male connector.

[0013] The nominal outer diameter of the head pipe and the ordinary pipe is 40-50 mm, the wall thickness is 1-2 mm, and the pipe length is 1000-1100 mm.

[0014] The thread length of the internal thread, the first external thread and the second external thread is 15-25 mm.

[0015] In specific use, first, the adapter is connected with the mine handheld pneumatic drill, then a φ42mm drill bit is connected with a φ30mm twist drill rod, then the twist drill rod with the drill bit is connected with the adapter, and the above processes are all fixed by using the spring pin structure. After the connection is completed, the drill is started. The first m twist drill rod does not use the casing assembly and directly enters the coal body, and in this process, the coal cuttings discharged in the drilling process are normally collected.

[0016] When the first m twist drill rod enters the coal body, the drilling is stopped, the drill is separated from the first m twist drill rod, and the second m twist drill rod is added. The connection of the twist drill rods is completed by combining the second spring pin male joint and the second spring pin female joint, and the twist drill rods are connected with the adapter by combining the second spring pin male joint and the first spring pin female joint in the same way. The head pipe is sleeved on the newly added twist drill rod. The head pipe is connected with the adapter by engaging the first fixing groove at the left end with the fixing column on the surface of the adapter. The drill is started, the head pipe drills into the coal body together with the twist drill rod under the action of the first fixing groove and the fixing column, and the coal cuttings can only be discharged through the middle of the head pipe. When the coal cuttings are discharged from the pipe opening of the head pipe, the coal cutting collection work is completed by using the pipe opening sampling method.

[0017] When the second m twist drill rod enters the coal body, the drilling is stopped, the adapter is reversely rotated by a certain angle, the fixing column is moved to the gap of the first fixing groove, the drill is pulled out to separate the head pipe from the adapter. Then, the third m twist drill rod and the common pipe are added, and the connection process of the twist drill rod and the common pipe is basically the same as the connection process of the second m twist drill rod and the head pipe. It should be noted that the head pipe and the common pipe are screw-connected through the first external thread and the internal thread, and the common pipes are screw-connected through the second external thread and the internal thread. The drill is started, the coal cuttings are discharged from the pipe opening of the common pipe, and the sampling work is completed by collecting the coal cuttings from the pipe opening. The remaining drilling operations are repeated according to the above process.

[0018] When the sampling work is completed, the drill is dismounted, the adapter is reversely rotated to remove the casing assembly, and the twist drill rod and the drill bit are withdrawn, so that the equipment recovery is completed. If the casing assembly is stuck in the drill hole during the equipment recovery process, the recovery thereof can be directly abandoned, and the safe recovery of the drill bit and the twist drill rod is ensured.

[0019] In summary, the utility model is simple and convenient to operate, and through the cooperation of the drilling assembly, the casing assembly and the adapter, the fixed-point sampling in the drilling cutting index determination process can be realized, the accuracy of the drilling cutting index measurement value is improved, the risks such as hole collapse, drill sticking and drill rod falling are reduced, and the sampling efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the utility model;

[0021] Figure 2 is a structure diagram of the adapter of the utility model;

[0022] Figure 3 is a structure diagram of the head pipe of the utility model;

[0023] Figure 4 is a structure diagram of the ordinary pipe of the utility model;

[0024] Figure 5 is a structure diagram of the drilling assembly of the utility model;

[0025] Figure 6 is a structure diagram of the twist drill rod of the utility model;

[0026] Figure 7 is a structure diagram of the drill bit of the utility model; DETAILED DESCRIPTION

[0027] As Figures 1-7 shown, the utility model discloses a casing type fixed-point sampling device for drilling chip index determination, including drilling assembly 1, casing assembly 2 and adapter 3, adapter 3 includes adapter body 4, first spring pin male connector 5, first spring pin female connector 6 and fixed column 7, first spring pin male connector 5 is arranged at the left end of adapter body 4, and first spring pin female connector 6 is arranged at the right end of adapter body 4, and one fixed column 7 is arranged at the upper and lower sides of adapter body 4 respectively;

[0028] casing assembly 2 includes head pipe 8 and several ordinary pipes 9, and head pipe 8 includes first pipe body 10, first external thread 11 and first fixed slot 12, and the left end of first pipe body 10 is provided with first fixed slot 12 and first external thread 11, and ordinary pipe 9 includes second pipe body 13, second external thread 14, second fixed slot 15 and internal thread 16, and the left end of second pipe body 13 is provided with second external thread 14 and second fixed slot 15, and the right end of second pipe body 13 is provided with internal thread 16;First fixed slot 12 and second fixed slot 15 are all corresponding with fixed column 7, and head pipe 8 can be connected with adapter 3 through the cooperation of first fixed slot 12 and fixed column 7, and ordinary pipe 9 can be connected with adapter 3 through the cooperation of second fixed slot 15 and fixed column 7.The head pipe 8 and the ordinary pipe 9 are connected by the first external thread 11 and the internal thread 16, and the connection between the ordinary pipes 9 is connected by the second external thread 14 and the internal thread 16. Among them, the left end of head pipe 8 and ordinary pipe 9 is close to the end of drilling machine, and the right end is away from the end of drilling machine, and the pipe opening of head pipe 8 close to the end of drilling machine is external thread break, and the pipe opening of head pipe 8 away from the end of drilling machine is smooth round opening.

[0029] The drilling assembly 1 comprises several twist drill rods 17 and a drill bit 24 arranged at the right end of the rightmost twist drill rod. The twist drill rod 17 comprises a drill rod body 19, a second spring pin male joint 20, a second spring pin female joint 21 and a drill rod thread 22. The second spring pin male joint 20 is arranged at the left end of the drill rod body 19, the second spring pin female joint 21 is arranged at the right end of the drill rod body 19, and the drill rod thread 22 is arranged on the outer surface profile of the drill rod body 19. The first spring pin male joint 5 corresponds to the joint on the drilling machine, so that the adapter 3 is connected with the drilling machine through the first spring pin male joint 5. The second spring pin male joint 20 corresponds to the first spring pin female joint 6 and the second spring pin female joint 21, so that the twist drill rod 17 is connected with the adapter 3 through the cooperation of the second spring pin male joint 20 and the first spring pin female joint 6, and the twist drill rods 17 are connected through the cooperation of the second spring pin male joint 20 and the second spring pin female joint 21.

[0030] The drill bit 24 comprises a cutting edge 18, the cutting edge 18 is provided with a cutting groove 25 opening to the right, the right end of the cutting edge 18 is a sharp structure 26, and the left end of the cutting edge 18 is provided with a third spring pin male joint 23 matched with the second spring pin female joint 21 for connecting the drill bit 24 with the twist drill rod 17.

[0031] The nominal outer diameter of the head pipe 8 and the common pipe 9 is 40-50 mm, the wall thickness is 1-2 mm, and the pipe length is 1000-1100 mm. During the drilling process, the deviation of the drilling direction caused by the vibration of the drilling machine and the drill rod, the deflection or swing of the drill bit 24 caused by too fast drilling speed or too large feeding pressure, and the increase of the actual outer diameter of the drill bit 24 caused by the adhesion of drill cuttings on the drill bit 24, etc. will all cause the drilling hole diameter to increase. Therefore, in actual production, when using the drill cuttings index method for measurement, the actual diameter of the drilling hole is greater than 42 mm, and the diameter of the drilling hole is generally about 48 mm. The most preferred nominal outer diameter of the head pipe 8 and the common pipe 9 is 47 mm, the most preferred wall thickness is 1.5 mm, and the most preferred pipe length is 1.02 m. The material of the head pipe 8 and the common pipe 9 is PC material, which has the characteristics of high mechanical strength, flame retardant, anti-static, and high temperature resistance.

[0032] The thread length of the internal thread, the first external thread 11 and the second external thread 14 is 15-25 mm. In actual production, 20 mm length is the most preferred.

[0033] First, the adapter 3 is connected with the mine handheld pneumatic drill, then the φ42 mm drill bit 24 is connected with the φ30 mm twist drill rod 17, and then the twist drill rod 17 with the drill bit 24 is connected with the adapter 3. The above process is completed by using the spring pin structure to fix. After the connection is completed, the drill is started. The first meter twist drill rod 17 does not use the casing assembly 2 and directly enters the coal body. During this process, the coal cuttings discharged during the drilling process are normally collected.

[0034] When the first m auger rod 17 enters the coal body, stop drilling, separate the drill from the first m auger rod 17, and add the second m auger rod 17. The connection of the auger rod 17 is completed through the combination of the second spring pin male joint 20 and the second spring pin female joint 21, and the auger rod 17 is connected with the adapter 3 in the same way through the combination of the second spring pin male joint 20 and the first spring pin female joint 6. And a head pipe 8 is added to the new auger rod 17. The head pipe 8 is connected with the adapter 3 by engaging the first fixed slot 12 at the left end with the fixed column 7 on the surface of the adapter 3. Start the drill, and the head pipe 8 drills together with the auger rod 17 under the action of the first fixed slot 12 and the fixed column 7. During the drilling process, the coal dust can only be discharged through the middle of the head pipe 8. When the coal dust is discharged from the pipe opening of the head pipe 8, the method of pipe opening sampling is used to complete the coal dust collection work.

[0035] When the second m auger rod 17 enters the coal body, stop drilling, reverse the adapter 3 by a certain angle, move the fixed column 7 to the gap of the first fixed slot 12, and separate the head pipe 8 from the adapter 3 by pulling the drill outward. Then add the third m auger rod 17 and the common pipe 9, and the connection process of the auger rod 17 and the common pipe 9 is basically the same as the connection process of the second m auger rod 17 and the head pipe 8 described above. It should be noted that the head pipe 8 and the common pipe 9 are connected by the internal thread 16 and the first external thread 11, and the common pipes 9 are connected by the internal thread 16 and the second external thread 14. Start the drill, and the coal dust is discharged from the pipe opening of the common pipe 9 to complete the sampling work. The remaining drilling operations are repeated according to the above process.

[0036] When the sampling work is completed, the drill is removed, the adapter 3 is reversed to remove the casing assembly 2, and the auger rod 17 and the drill bit 24 are withdrawn to complete the equipment recovery. If the casing assembly 2 is stuck in the drill hole during the equipment recovery process, it can be directly abandoned to ensure the safe recovery of the drill bit 24 and the auger rod 17. The utility model is simple and convenient to operate. Through the cooperation of the drilling assembly 1, the casing assembly 2 and the adapter 3, not only can the fixed-point sampling in the drilling cuttings index determination process be realized to improve the accuracy of the drilling cuttings index measurement value, but also the risks such as hole collapse, pipe sticking and drill rod falling can be reduced to improve the sampling efficiency. In addition, using the device for coal drilling operation solves the problem of mixing of coal along the hole wall, realizes fixed-point sampling, improves the accuracy of sampling, and improves the accuracy of the index measurement value of the outburst prediction and efficiency detection. When the device is used for drilling operation, the problems of hole collapse and pipe sticking caused by the collapse of the drill hole wall can be effectively avoided, and the drilling speed and success rate are improved. After the operation of the device is completed, the auger rod 17 can be directly withdrawn from the casing assembly 2, and the recovery of the drill rod is more simple and efficient, which solves the problem of drill rod that cannot be withdrawn after hole collapse and pipe sticking.

[0037] The embodiment is not limited in shape, material, structure, etc. of the utility model in any form, and any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model are within the protection scope of the technical scheme of the utility model.

Claims

1. A casing point sampler for drill cuttings index determination, characterized by: The drilling assembly, the casing assembly and the adapter are included, the adapter includes the adapter body, the first spring pin male joint, the first spring pin female joint and the fixing column, the first spring pin male joint is arranged at the left end of the adapter body, the first spring pin female joint is arranged at the right end of the adapter body, and one fixing column is arranged on the upper and lower sides of the adapter body; The casing assembly includes the head pipe and a plurality of ordinary pipes, the head pipe includes the first pipe body, the first external thread and the first fixing groove, the left end of the first pipe body is provided with the first fixing groove and the first external thread, the ordinary pipe includes the second pipe body, the second external thread, the second fixing groove and the internal thread, the left end of the second pipe body is provided with the second external thread and the second fixing groove, and the right end of the second pipe body is provided with the internal thread; The drilling assembly includes a plurality of twist drill pipes and a drill bit arranged at the right end of the rightmost drill pipe, the twist drill pipe includes the drill pipe body, the second spring pin male joint, the second spring pin female joint, the drill pipe thread, the second spring pin male joint is arranged at the left end of the drill pipe body, the second spring pin female joint is arranged at the right end of the drill pipe body, and the drill pipe thread is arranged on the outer surface profile of the drill pipe body.

2. A sleeve-type point sampling device for drillings index determination according to claim 1, characterized in that: The drill bit includes the cutting edge, the cutting edge is provided with the cutting groove with the opening to the right, the right end of the cutting edge is the sharp structure, and the left end of the cutting edge is provided with the third spring pin male joint.

3. A sleeve-type point sampling device for drillings index determination according to claim 2, characterized in that: The nominal outer diameter of the head pipe and the ordinary pipe is 40-50 mm, the wall thickness is 1-2 mm, and the pipe length is 1000-1100 mm.

4. A sleeve-type point sampling device for drill cuttings index determination according to claim 3, characterized in that: The thread length of the internal thread, the first external thread and the second external thread is 15-25 mm.

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