Portable sampling device for coal mine exploration

Abstract

The invention discloses a portable sampling device for coal mine exploration, and relates to the technical field of coal mine detection sampling. Comprising a flexible sleeve, the flexible sleeve is rotationally connected with a connecting piece in a sealed mode, and the connecting piece is fixedly connected with a connecting sleeve; the sample storage piece is rotationally connected into the connecting sleeve in a sealed mode and attached to the connecting piece, and an even number of sample storage holes are formed in the sample storage piece; the middle connecting piece is mounted in the connecting sleeve, and two transfer runners which are symmetrically distributed are arranged in the middle connecting piece; and the drill bit is mounted on the connecting sleeve. The sample storage piece is used for drilling along with the drill bit, when the sample storage piece reaches the sampling position, the sample storage piece is controlled to collect the coal sample by controlling the pressure of cooling water, the purpose of coherent drilling and sampling is achieved, the sampling convenience and sampling efficiency are improved, meanwhile, the gas dissipation time in a coal seam is shortened, and the coal seam sampling efficiency is improved. And the deviation between the detection result and the actual condition is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine detection sampling, and in particular to a portable sampling device for coal mine exploration. Background Art

[0002] During coal mining, the gas content of coal seams is a key parameter to ensure safe production in mines. It is also an important basis for predicting outstanding hazards, designing extraction, and evaluating the effectiveness of gas control. Therefore, before coal mining, the gas concentration in the coal seam must be accurately tested in order to formulate a scientific and reasonable mining plan.

[0003] Gas content testing methods are mainly divided into two categories: direct method and indirect method. Among them, the direct method first requires collecting coal samples, and then determining the gas content in the coal seam by desorption method. The accuracy of this method is highly dependent on the exposure time of the coal sample during the sampling process and the accuracy of the sampling position. In order to ensure the accuracy of the sampling position, drilling equipment is usually used for directional drilling, and then the drilling equipment is withdrawn and the sampling equipment is lowered, so as to use the sampling equipment for fixed-point sampling. The above operation steps are cumbersome, the sampling efficiency is low, and the exposure time of the coal sample is long, which increases the risk of gas escape and causes a deviation between the final measured gas content result and the actual situation. Summary of the invention

[0004] The present invention provides a portable sampling device for coal mine exploration, so as to overcome the shortcomings of the existing sampling and detection of coal seam gas concentration, that is, drilling and sampling are carried out separately, resulting in complicated operation, low sampling efficiency and large result deviation.

[0005] Technical solution: A portable sampling device for coal mine exploration, comprising: a flexible sleeve, in which a power part is installed, the flexible sleeve is sealingly and rotatably connected to a connecting part splined to an output shaft of the power part, and the connecting part is fixedly connected to a connecting sleeve; a sample storage part, sealingly and rotatably connected to the connecting sleeve and fits with the connecting part, an even number of sample storage holes are provided in the sample storage part; a middle connecting part, installed in the connecting sleeve and fits with a side of the sample storage part away from the flexible sleeve, and two symmetrically distributed transfer flow channels are provided in the middle connecting part; a drill bit, installed on a side of the connecting sleeve away from the flexible sleeve, and two symmetrically distributed sample inlet flow channels are provided in the drill bit, the transfer flow channels are used to connect adjacent sample storage holes with adjacent sample inlet flow channels, and the middle connecting part fits with the drill bit; a power assembly, arranged in the sample storage part, used to drive the sample storage part to rotate and switch the sample storage holes connected with the transfer flow channels.

[0006] Furthermore, the power assembly includes: a central axis, fixedly connected to the connecting member, and a mounting blind hole is provided in the sample storage member; a sliding member, sealed and slidably connected in the mounting blind hole, and the sliding member is spline-connected to the central axis; a main one-way wheel, installed in the mounting blind hole, and a secondary one-way wheel is installed in the mounting blind hole, a spring is fixedly connected between the sliding member and the main one-way wheel, a main slide groove and a secondary slide groove are provided on the sliding member, the main one-way wheel slides in the main slide groove, and the secondary one-way wheel slides in the secondary slide groove.

[0007] Furthermore, an arc-shaped through hole is provided on the connecting member, and the arc-shaped through hole is connected with the mounting blind hole; the sample storage member is provided with drainage channels whose number is equal to the sample storage holes, and all the drainage channels are staggered with all the sample storage holes, and the drainage channels are connected with the mounting blind holes; a confluence channel is provided on the intermediate connecting member, and a cooling channel is provided in the drill bit, and the confluence channel is used to connect adjacent drainage channels with the cooling channels, and the transfer channel is connected with adjacent drainage channels.

[0008] Furthermore, the central angle corresponding to the projection of the main slide groove on the end surface of the sliding member with the central axis of the sliding member as the center is equal to the central angle corresponding to the projection of the secondary slide groove on the end surface of the sliding member with the central axis of the sliding member as the center, and the above central angle is equal to the central angle corresponding to the projection of the discharge channel and the adjacent sample storage hole on the end surface of the sample storage member with the central axis of the sample storage member as the center.

[0009] Furthermore, the minimum distance between the sample storage hole and the central axis of the sample storage member is greater than the maximum distance between the drainage channel and the central axis of the sample storage member.

[0010] Furthermore, it also includes: a mounting ring, which is slidably connected in the connecting sleeve and is slidably connected to the sample storage member, the sample storage member is provided with a first arc groove, a first guide groove, a second arc groove and a second guide groove which are connected in sequence, and the mounting ring slides along the first arc groove, the first guide groove, the second arc groove and the second guide groove; two shielding plates, which are fixed to the side of the mounting ring away from the flexible sleeve and are splined to the connecting sleeve, the shielding plates are sealingly and slidably connected to the intermediate connecting member, the connecting sleeve is provided with two sample row holes, the sample row holes are connected to adjacent transfer flow channels, and the shielding plates are used to isolate adjacent transfer flow channels from adjacent sample row holes; an elastic member, which is fixed to the side of the mounting ring away from the shielding plate, and the elastic member is fixed to the connecting sleeve.

[0011] Furthermore, in the direction from the drill bit to the flexible sleeve, the maximum distance between the injection channel and the central axis of the drill bit gradually increases.

[0012] Furthermore, it also includes: a sealing ring fixedly connected to the mounting ring, the sealing ring is sealingly and slidingly connected to the connecting sleeve, the connecting sleeve, the sample storage member, the mounting ring and the sealing ring cooperate to form a liquid accumulation chamber, the sample storage member is provided with drainage holes whose number is equal to the sample storage holes, the drainage holes connect the adjacent sample storage holes with the liquid accumulation chamber, and the elastic member is located in the liquid accumulation chamber.

[0013] Furthermore, the maximum distance between the drainage hole and the end surface of the liquid accumulation cavity away from the mounting ring is smaller than the generatrix length of the mounting ring, so that the mounting ring can block the drainage hole.

[0014] Furthermore, it also includes: a shielding member, which is fixedly connected to a side of the sample storage member close to the drill bit, the shielding member passes through the intermediate member and is sealed and rotatably connected to the drill bit, the shielding member is used to shield the sample inlet channel and the cooling channel, and the shielding member is provided with connecting holes whose number is equal to the sample storage holes, and the connecting holes are used to release the shielding member from blocking the sample inlet channel.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention utilizes a sample storage part to drill along with the drill bit, and when reaching the sampling position, the sample storage part is controlled by controlling the pressure of cooling water to collect coal samples, so as to achieve the purpose of continuous drilling and sampling, which not only improves the convenience and efficiency of sampling, but also shortens the time of gas dissipation in the coal seam, thereby reducing the deviation between the detection result and the actual situation; the present invention adopts a method of combining the sampling mechanism with the drilling mechanism as one body, thereby reducing the number of tools carried during coal mine exploration and improving the convenience of coal mine exploration; the centrifugal force during the rotation of the connecting sleeve is utilized to throw out the coal samples in the transfer flow channel and the sampling flow channel through the sample discharge hole, so as to avoid the coal samples in the transfer flow channel and the sampling flow channel remaining, resulting in the coal samples collected at the subsequent sampling position being mixed with the coal samples mixed at the previous sampling position, resulting in poor sampling effect; the cooling water in the sample storage hole is thrown out through the drainage hole, so as to prevent the coal sample from being immersed in the cooling water and affecting the subsequent detection of the gas content in the coal sample by the desorption device, resulting in the determination of the actual gas content in the coal mine being inconsistent with the actual situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the flexible sleeve, the connecting sleeve and the sample storage member of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the connecting piece, the connecting sleeve and the sample storage piece of the present invention; Figure 4 An exploded view of the connector, the connector sleeve and the sample storage member of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the central shaft, the sliding member and the main one-way wheel of the present invention; Figure 6 An exploded view of the central shaft, the sliding member and the main one-way wheel of the present invention; Figure 7 It is a three-dimensional structural cross-sectional view of the connecting sleeve, the middle connecting piece and the drill bit of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the connecting sleeve, the sample storage member and the intermediate connecting member of the present invention; Fig. 9 An exploded view of the sample storage member, the mounting ring and the shielding sheet of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the connecting sleeve, the sample storage member and the mounting ring of the present invention.

[0017] The accompanying drawings are marked as follows: 1-flexible sleeve, 2-power member, 3-connecting member, 4-connecting sleeve, 5-sample storage member, 501-sample storage hole, 6-middle connecting member, 601-transfer flow channel, 7-drill bit, 701-injection flow channel, 8-middle shaft, 801-mounting blind hole, 9-sliding member, 10-main one-way wheel, 101-main slide groove, 11-secondary one-way wheel, 111-secondary slide groove, 12-arc through hole, 121-drainage channel, 122-convergence channel, 123-cooling channel, 13-mounting ring, 131-first arc groove, 132-first guide groove, 133-second arc groove, 134-second guide groove, 14-shielding piece, 141-sample hole, 15-elastic member, 16-sealing ring, 161-liquid accumulation chamber, 162-drainage hole, 17-shielding member, 171-connecting hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0020] A portable sampling device for coal mine exploration, please refer to Figure 1-Figure 4, including: a flexible sleeve 1, in which a power piece 2 is installed, the flexible sleeve 1 is sealed and rotatably connected to a connecting piece 3 splined to the output shaft of the power piece 2, and the connecting piece 3 is fixedly connected to a connecting sleeve 4; a sample storage piece 5 is sealed and rotatably connected to the connecting sleeve 4 and fits with the connecting piece 3, and an even number of sample storage holes 501 are arranged in the sample storage piece 5; a middle connecting piece 6 is installed in the connecting sleeve 4 and fits with a side of the sample storage piece 5 away from the flexible sleeve 1, and two symmetrically distributed transfer flow channels 601 are arranged in the middle connecting piece 6; a drill bit 7 is installed on a side of the connecting sleeve 4 away from the flexible sleeve 1, and two symmetrically distributed sample inlet flow channels 701 are arranged in the drill bit 7, and the transfer flow channels 601 are used to connect adjacent sample storage holes 501 with adjacent sample inlet flow channels 701, and the middle connecting piece 6 fits with the drill bit 7; a power component is arranged in the sample storage piece 5, and is used to drive the sample storage piece 5 to rotate and switch the sample storage holes 501 connected with the transfer flow channels 601.

[0021] The above scheme aims to solve the problem that when sampling coal seams to detect the gas content in the coal seams, the drilling operation and the sampling operation are carried out separately, resulting in a long sampling time, low sampling efficiency, and a long time required for drilling back to sampling, and serious gas leakage in the coal seam, resulting in a large deviation between the result and the actual situation; this scheme uses the sample storage part 5 to drill along with the drill bit 7, and when it reaches the sampling position, the sample storage part 5 is controlled by controlling the pressure of the cooling water to collect the coal sample, so as to achieve the purpose of continuous drilling and sampling, which not only improves the convenience and efficiency of sampling, but also shortens the time for gas leakage in the coal seam, thereby reducing the deviation between the detection result and the actual situation; this scheme adopts a method of combining the drilling mechanism and the sampling mechanism into one, thereby reducing the number of drill bits carried during coal mine exploration (currently, two drill bits, drilling and sampling, need to be carried during coal mine exploration), and improving the convenience of coal mine exploration.

[0022] The flexible sleeve 1 is connected to an external drilling rig, which is used to control the flexible sleeve 1 to move to the sampling position. The flexible sleeve 1 is connected to an external cooling water pump, which is used to transport cooling water into the flexible sleeve 1. The power part 2 can be selected according to actual conditions. In this solution, the power part 2 is a hydraulic motor, which is used to provide power for the drill bit 7 to drill. The sample storage holes 501 are selected according to the actual sampling times, and the sample storage holes 501 are an even number of centrally symmetrically distributed holes, which are used to reduce the eccentricity of the sample storage part 5 and improve the connection sleeve 4 and the sample storage hole 501. The stability of the parts 5, the middle connecting part 6 and the drill bit 7 during rotation. In this scheme, the number of sample storage holes 501 is four, and the coal samples are simultaneously delivered to the sample storage holes 501 at the central symmetrical position in one sampling position; the sample storage hole 501 can be a through hole that is connected on both sides. During use, the left side of the sample storage hole 501 is blocked by the connecting part 3. The sample storage hole 501 can also be a blind hole blocked on the left side. The middle connecting part 6 is used to block the right end of the sample storage hole 501 to provide a closed environment for the coal sample in the sample storage hole 501.

[0023] Please refer to Figure 3-Figure 6 The power assembly includes: a central axis 8, which is fixedly connected to the connecting member 3, and a mounting blind hole 801 is arranged in the sample storage member 5; a sliding member 9, which is sealingly and slidingly connected in the mounting blind hole 801, and the sliding member 9 is spline-connected to the central axis 8; a main one-way wheel 10, which is installed in the mounting blind hole 801, and a secondary one-way wheel 11 is installed in the mounting blind hole 801, a spring is fixedly connected between the sliding member 9 and the main one-way wheel 10, and a main slide groove 101 and a secondary slide groove 111 are arranged on the sliding member 9, the main one-way wheel 10 slides in the main slide groove 101, and the secondary one-way wheel 11 slides in the secondary slide groove 111.

[0024] In the above scheme, the sliding member 9 is intended to detect the pressure of the cooling water in the connecting member 3, and drive the sample storage member 5 to rotate counterclockwise under the driving force of the cooling water pressure (the rotation perspective in this article is from left to right); the spline connection between the sliding member 9 and the central axis 8 can be set to an arc shape, which is used to improve the sealing performance between the central axis 8 and the sliding member 9; the main one-way wheel 10 and the secondary one-way wheel 11 can be composed of an inner ring, an outer ring and a one-way structure therebetween. The inner rings of the main one-way wheel 10 and the secondary one-way wheel 11 can drive the adjacent outer rings to rotate counterclockwise through the one-way structure, but cannot drive the adjacent outer rings to rotate clockwise. When the sliding member 9 moves to the right due to the cooling water pressure, the sliding member 9 drives the main one-way wheel 10 to rotate counterclockwise through the main slide groove 101, and the main one-way wheel 10 drives the sample storage member 5 to rotate counterclockwise. During this process, the secondary one-way wheel 11 is in an idling state.

[0025] Please refer to Figure 3 , Figure 5 and Figure 7 An arc-shaped through hole 12 is provided on the connecting member 3, and the arc-shaped through hole 12 is connected with the mounting blind hole 801. The sample storage member 5 is provided with drainage channels 121 equal in number to the sample storage holes 501. All the drainage channels 121 are staggered with all the sample storage holes 501. The drainage channels 121 are connected with the mounting blind holes 801. A confluence channel 122 is provided on the intermediate connecting member 6. A cooling channel 123 is provided in the drill bit 7. The confluence channel 122 is used to connect adjacent drainage channels 121 with cooling channels 123. The transfer channel 601 is connected with the adjacent drainage channel 121.

[0026] In the above scheme, it is intended to provide a circulation path for cooling water, and to use cooling water to cool the drill bit 7 during the drilling process; the cooling water in the connector 3 can be transported to the installation blind hole 801 through the arc-shaped through hole 12, and then the cooling water is transported to the outside through the drainage channel 121, the confluence channel 122 and the cooling channel 123 through the installation blind hole 801; a shielding structure can be installed in the cooling channel 123 to prevent the coal sample from entering the cooling channel 123 and blocking it; the number of the confluence channel 122 and the cooling channel 123 are both two. Initially, the four sample storage holes 501 are distributed in an "X" shape, and the upper and lower drainage channels 121 are respectively connected to the adjacent transfer channel 601. At this time, the cooling water passes through the installation blind hole 80 1. The upper and lower drainage channels 121, two transfer channels 601 and two sample inlet channels 701 are used for discharge. During the sampling process (i.e., when the sample storage hole 501 is connected with the adjacent transfer channel 601), the coal sample enters the corresponding sample storage hole 501 through the sample inlet channel 701 and the transfer channel 601 under the action of drilling pressure. At this time, the drainage channel 121 is connected with the adjacent confluence channel 122, and the cooling water is discharged through the installation blind hole 801, four drainage channels 121, two confluence channels 122 and two cooling channels 123. In this way, the cooling of the drill bit 7 by the cooling water is not affected during the sampling process. At the same time, after a single sampling is completed, the excess coal sample accumulated in the transfer channel 601 can be discharged by utilizing the flow of cooling water in the transfer channel 601.

[0027] Please refer to Figure 4-Figure 6 The central angle of the projection of the main slide groove 101 on the end surface of the sliding member 9 with the central axis of the sliding member 9 as the center is equal to the central angle of the projection of the auxiliary slide groove 111 on the end surface of the sliding member 9 with the central axis of the sliding member 9 as the center, and the above central angle is equal to the central angle of the projection of the discharge channel 121 and the adjacent sample storage hole 501 on the end surface of the sample storage member 5 with the central axis of the sample storage member 5 as the center; the minimum distance between the sample storage hole 501 and the central axis of the sample storage member 5 is greater than the maximum distance between the discharge channel 121 and the central axis of the sample storage member 5.

[0028] In the above scheme, the purpose is to prevent the sample storage hole 501 from being connected to the confluence flow channel 122, thereby ensuring the sealing of the sample storage hole 501 on the coal sample therein; the sizes of the central angles corresponding to the main slide 101 and the auxiliary slide 111 are determined according to the number of the sample storage holes 501, so that after the sample storage part 5 rotates once by the angle of the central angle corresponding to the main slide 101, the switching of the connection state between the sample storage hole 501 and the adjacent transfer flow channel 601 can be completed.

[0029] Please refer to Figure 3 , Figure 8 and Fig. 9, further comprising: a mounting ring 13, slidably connected in the connecting sleeve 4, and slidably connected to the sample storage member 5, the sample storage member 5 is provided with a first arc groove 131, a first guide groove 132, a second arc groove 133 and a second guide groove 134 which are sequentially connected, the mounting ring 13 slides along the first arc groove 131, the first guide groove 132, the second arc groove 133 and the second guide groove 134; two shielding pieces 14, fixedly connected to the side of the mounting ring 13 away from the flexible sleeve 1, and splined to the connecting sleeve 4, shielding The baffle 14 is sealingly and slidably connected to the intermediate connector 6. Two sample holes 141 are provided on the connecting sleeve 4. The sample holes 141 are connected to the adjacent transfer channel 601. The baffle 14 is used to isolate the adjacent transfer channel 601 from the adjacent sample holes 141. The elastic member 15 is fixedly connected to the side of the mounting ring 13 away from the baffle 14. The elastic member 15 is fixedly connected to the connecting sleeve 4. In the direction from the drill bit 7 to the flexible sleeve 1, the maximum distance between the sample inlet channel 701 and the central axis of the drill bit 7 gradually increases.

[0030] In the above scheme, the centrifugal force during the rotation of the connecting sleeve 4 is used to throw the coal samples in the transfer channel 601 and the sampling channel 701 out through the sampling holes 141, so as to avoid the coal samples in the transfer channel 601 and the sampling channel 701 being retained, resulting in the coal samples collected at the subsequent sampling positions being mixed with the coal samples mixed at the previous sampling position, resulting in poor sampling effect; the upper and lower parts of the transfer channel 601 can be provided with inclined surfaces symmetrically distributed on the left and right, for guiding the coal samples in the transfer channel 601 to enter the sampling holes 141 along the inclined surfaces, and at the same time, the coal samples in the sampling channel 701 can move into the transfer channel 601 under the action of centrifugal force; the elastic member 15 can be a spring or an elastic sheet. In this scheme, the elastic member 15 is an elastic sheet, and the elastic member 15 The left end is embedded in the connecting sleeve 4, and an arc-shaped groove can be provided in the connecting sleeve 4 to accommodate the elastic member 15, so that when the mounting ring 13 moves to the leftmost side of the first guide groove 132 and the second guide groove 134, the left side of the mounting ring 13 can fit with the connecting sleeve 4; the projection of the first guide groove 132 on the end surface of the sample storage member 5 with the central axis of the sample storage member 5 as the center corresponds to a central angle of 40°, and the projection of the second guide groove 134 on the end surface of the sample storage member 5 with the central axis of the sample storage member 5 as the center corresponds to a central angle of 20°. Initially, the mounting ring 13 slides in the first arc groove 131. As the sample storage member 5 rotates counterclockwise, the mounting ring 13 enters the first guide groove 132, the second arc groove 133 and the second guide groove 134 in turn.

[0031] Please refer to Fig. 9 and Fig.10, and also includes: a sealing ring 16, which is fixed to the mounting ring 13, and the sealing ring 16 is sealingly and slidably connected to the connecting sleeve 4. The connecting sleeve 4, the sample storage member 5, the mounting ring 13 and the sealing ring 16 cooperate to form a liquid accumulation chamber 161. The sample storage member 5 is provided with drainage holes 162, the number of which is equal to the sample storage holes 501. The drainage holes 162 connect the adjacent sample storage holes 501 with the liquid accumulation chamber 161, and the elastic member 15 is located in the liquid accumulation chamber 161; the maximum distance between the drainage hole 162 and the end face of the liquid accumulation chamber 161 away from the mounting ring 13 is less than the busbar length of the mounting ring 13, so that the mounting ring 13 can block the drainage hole 162.

[0032] In the above scheme, the cooling water in the sample hole 501 is thrown out through the drainage hole 162 to prevent the coal sample from being immersed in the cooling water and causing the coal sample temperature to drop (during the drilling process, the gas in the damaged coal seam will be released outward, resulting in an increase in the gas content in the sample hole 501 when the sample hole 501 is used for sampling later. If the temperature of the coal sample is reduced, the coal sample's adsorption capacity for gas will be enhanced, resulting in an increase in the gas content in the coal sample. In this way, when the coal sample is subsequently tested for gas content, the amount of gas collected in the unit volume of the coal sample by the desorption device is more than the actual situation, affecting the determination of the actual gas content in the coal mine); the central axis of the drainage hole 162, the central axis of the adjacent sample hole 501 and The central axis of the sample storage part 5 is located in the same plane, so that the cooling water in the coal sample in the sample storage hole 501 can be discharged through the drainage hole 162 under the action of centrifugal force; the outer diameter of the mounting ring 13 is smaller than the inner diameter of the corresponding position of the connecting sleeve 4, so that the sealing ring 16 can "leak" when the pressure in the liquid accumulation chamber 161 is high, and then the cooling water in the liquid accumulation chamber 161 passes over the sealing ring 16 and is discharged out of the liquid accumulation chamber 161, so that the cooling water in the sample storage hole 501 is discharged, and the liquid accumulation chamber 161 is used to seal the sample storage hole 501; the inner side surface of the shielding piece 14 is in contact with the middle connecting piece 6, but there is a gap between the front and rear sides of the shielding piece 14 and the middle connecting piece 6, which is used to allow the cooling water after passing through the sealing ring 16 to be discharged to the outside.

[0033] Please refer to Figure 3 , Figure 4 and Figure 8 , and also includes: a shielding member 17, which is fixedly connected to a side of the sample storage member 5 close to the drill bit 7, the shielding member 17 passes through the middle connecting member 6 and is sealed and rotatably connected to the drill bit 7, the shielding member 17 is used to shield the sample inlet channel 701 and the cooling channel 123, and the shielding member 17 is provided with connecting holes 171 equal in number to the sample storage holes 501, and the connecting holes 171 are used to release the shielding member 17 from blocking the sample inlet channel 701.

[0034] In the above scheme, the purpose is to use the shielding member 17 to shield the sample inlet channel 701 and the cooling channel 123 to prevent external coal samples from entering the sample inlet channel 701 and the cooling channel 123 during drilling, resulting in blockage of the sample inlet channel 701 and the cooling channel 123; the shielding member 17 is composed of a connecting rod and a filter disc, and the connecting hole 171 is located on the filter disc of the shielding member 17; initially, the filter disc of the shielding member 17 blocks the sample inlet channel 701 and the cooling channel 123, and as the sample storage member 5 rotates, the sample storage hole 501 is connected with the corresponding transfer channel 601, and the sample inlet channel 701 and the cooling channel 123 adjacent to the connecting hole 171 are connected, and at this time, the external coal sample can enter the adjacent transfer channel 601 through the sample inlet channel 701.

[0035] The overall working principle of the above scheme is as follows: before mining the coal mine, start the drilling rig, the power part 2 and the cooling water pump to make the drill bit 7 drill into the coal seam. At the same time, the cooling water pump delivers cooling water to cool the drill bit 7 through the arc-shaped through hole 12, the installation blind hole 801, the upper and lower drainage channels 121, the two transfer channels 601 and the two sampling channels 701. After the drill bit 7 reaches the sampling position, the water pressure of the cooling water in the flexible sleeve 1 is increased, and the cooling water pushes the sliding part 9 to the right, compressing the spring adjacent to the sliding part 9. The sliding part 9 drives the sample storage part 5 and the shielding part 17 to rotate 45° counterclockwise through the main slide groove 101 and the main one-way wheel 10 (during the rotation of the sample storage part 5, the installation ring 13 slides in the first arc groove 131) , the sample inlet channel 701 and the cooling channel 123 are respectively connected to the connecting hole 171, and the four sample storage holes 501 distributed in an "X" shape are rotated to a "cross" distribution state. At this time, the two sample storage holes 501 in a vertical state are respectively connected to the adjacent transfer channel 601, and at the same time, the drainage channel 121 loses the connection with the middle connecting piece 6 and is connected to the adjacent confluence channel 122. At this time, the cooling water is transported to the drill bit 7 through the arc through hole 12, the installation blind hole 801, the four drainage channels 121, the two confluence channels 122 and the two cooling channels 123. At the same time, as the drill bit 7 continues to drill, the coal sample enters the corresponding sample storage hole 501 through the sample inlet channel 701 and the adjacent transfer channel 601 under the action of drilling pressure.

[0036] As the coal sample enters the sample storage hole 501, after the drill bit 7 moves the set distance, the water pressure of the cooling water in the flexible sleeve 1 is slowly reduced. At this time, the sliding member 9 moves left under the action of the adjacent spring, and the sliding member 9 drives the sample storage member 5 to rotate 45° counterclockwise again through the auxiliary slide groove 111 and the auxiliary one-way wheel 11. During this process, when the sample storage member 5 rotates 25°, the sample storage hole 501 containing the coal sample is misaligned with the adjacent transfer flow channel 601 and loses communication. At the same time, the mounting ring 13 moves to the end of the first arc groove 131. As the sample storage member 5 continues to rotate the remaining 20°, the mounting ring 13 moves along the first guide groove 132, so that the first guide groove 132 drives the shielding piece 14 to move left through the mounting ring 13 and compresses the elastic member 15. The volume of the accumulating liquid chamber 161 gradually decreases. The cooling water in the coal sample in 501 is affected by the centrifugal force and enters the liquid accumulation chamber 161 through the drainage hole 162. The cooling water is temporarily stored in the liquid accumulation chamber 161. As the mounting ring 13 moves to the left, the mounting ring 13 gradually blocks the drainage hole 162. At this time, as the volume of the liquid accumulation chamber 161 decreases, the cooling water in the liquid accumulation chamber 161 squeezes the sealing ring 16 to deform. After the sliding part 9 is reset, the sample storage part 5 stops rotating (the blocking part 17 blocks the sample inlet channel 701 and the cooling channel 123 again). At this time, the left side of the mounting ring 13 is fitted with the connecting sleeve 4, and the volume of the liquid accumulation chamber 161 is reduced to zero. The cooling water in the original liquid accumulation chamber 161 completely passes over the sealing ring 16 and flows along the gap between the front and rear sides of the blocking piece 14 and the middle connecting part 6, and is finally discharged through the sample discharge hole 141.

[0037] After the sample storage part 5 rotates 90° cumulatively, it stops rotating, and the drainage channel 121 is connected with the transfer channel 601 again. As the cooling water enters the transfer channel 601, under the action of centrifugal force, a part of the cooling water drives the coal sample in the transfer channel 601 to be discharged to the outside through the adjacent sampling holes 141, and the other part of the cooling water is discharged through the sampling channel 701. At this time, the first sampling is completed, and the worker controls the drill rig to adjust the drill bit 7 to drill to the second sampling position. After the drill bit 7 reaches the second sampling position, the cooling water pressure in the flexible sleeve 1 is increased, and the above-mentioned steps of rotating the sample storage part 5 are repeated. During the first 20° rotation of the sample member 5 (at this time, the sample storage member 5 rotates a total of 110°), the sample storage hole 501 is never connected with the transfer channel 601, and the mounting ring 13 gradually moves to the end of the first guide groove 132. At this time, the mounting ring 13, the shielding plate 14 and the elastic member 15 are all reset, and the shielding plate 14 blocks the sample hole 141. As the sample storage member 5 continues to rotate (the mounting ring 13 moves along the second arc groove 133), the sample storage hole 501 without the coal sample is connected with the adjacent transfer channel 601, and the above steps of the coal sample entering the sampling channel 701 are repeated to sample the current sampling position.

[0038] After the second sampling is completed, the above steps of reducing the cooling water pressure are repeated (but not reduced to the initial water pressure, so that the sliding member 9 cannot be completely reset), and the sample storage member 5 continues to rotate (in this process, the mounting ring 13 moves along the second guide groove 134). At this point, the mounting ring 13 blocks the drainage hole 162 again (but the left side of the mounting ring 13 is not in contact with the connecting sleeve 4). The worker stops the power member 2 and controls the drilling rig to retract the device. At this time, the cooling water pump is stopped, so that the sliding member 9 is reset under the action of the adjacent spring and drives the sample storage member 5 to rotate (at this time, the sample storage member 5 rotates a total of 180°). After the mounting ring 13 moves to the leftmost side of the second guide groove 134, it is supported by the elastic member 15. The worker moves right due to the extrusion force, and finally the mounting ring 13 moves to the end of the second guide groove 134 (at the beginning of the first arc groove 131). At this time, the worker removes the drill bit 7, and takes out the sample storage part 5, the intermediate connecting part 6, the mounting ring 13 and the shielding piece 14 from the connecting sleeve 4. Then, the coal samples in the four sample storage holes 501 are taken out in turn and tested using a desorption device. After taking out the coal samples, the worker rotates the mounting ring 13 clockwise relative to the sample storage part 5 to make the mounting ring 13 slide to the initial position along the first arc groove 131. Then, the sample storage part 5, the intermediate connecting part 6, the mounting ring 13 and the shielding piece 14 are reinstalled into the connecting sleeve 4, and the drill bit 7 is installed.

[0039] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A portable sampling device for coal mine exploration, characterized in that: include: A flexible sleeve (1), wherein a power member (2) is installed in the flexible sleeve (1), the flexible sleeve (1) is sealingly rotatably connected to a connecting member (3) spline-connected to an output shaft of the power member (2), and the connecting member (3) is fixedly connected to a connecting sleeve (4); A sample storage member (5) is sealingly rotatably connected to the connecting sleeve (4) and is in close contact with the connecting member (3); an even number of sample storage holes (501) are provided in the sample storage member (5); A middle connecting piece (6) is installed in the connecting sleeve (4) and is in contact with a side of the sample storage piece (5) away from the flexible sleeve (1), and two symmetrically distributed transfer flow channels (601) are arranged in the middle connecting piece (6); A drill bit (7) is mounted on a side of the connecting sleeve (4) away from the flexible sleeve (1), and two symmetrically distributed sample inlet channels (701) are arranged in the drill bit (7), and the transfer channel (601) is used to connect the adjacent sample storage holes (501) with the adjacent sample inlet channels (701), and the intermediate connector (6) is fitted with the drill bit (7); A power assembly is disposed in the sample storage member (5) and is used to drive the sample storage member (5) to rotate and switch the sample storage hole (501) in communication with the transfer channel (601).

2. A portable sampling device for coal mine exploration according to claim 1, characterized in that: The power assembly comprises: The central axis (8) is fixedly connected to the connecting member (3), and a mounting blind hole (801) is provided in the sample storage member (5); A sliding member (9) is sealingly and slidably connected in the mounting blind hole (801), and the sliding member (9) is spline-connected to the central shaft (8); The main one-way wheel (10) is installed in the installation blind hole (801), and the secondary one-way wheel (11) is installed in the installation blind hole (801). A spring is fixedly connected between the sliding member (9) and the main one-way wheel (10). The sliding member (9) is provided with a main slide groove (101) and a secondary slide groove (111). The main one-way wheel (10) slides in the main slide groove (101), and the secondary one-way wheel (11) slides in the secondary slide groove (111).

3. A portable sampling device for coal mine exploration according to claim 2, characterized in that: The connecting member (3) is provided with an arc-shaped through hole (12), the arc-shaped through hole (12) being in communication with the mounting blind hole (801); the sample storage member (5) is provided with drainage channels (121) equal in number to the sample storage holes (501); all the drainage channels (121) are arranged in a staggered manner with all the sample storage holes (501); the drainage channels (121) are in communication with the mounting blind hole (801); the intermediate connecting member (6) is provided with a converging channel (122); the drill bit (7) is provided with a cooling channel (123), the converging channel (122) being used to connect adjacent drainage channels (121) with the cooling channel (123); and the transfer channel (601) is in communication with adjacent drainage channels (121).

4. A portable sampling device for coal mine exploration according to claim 3, characterized in that: The center angle of the projection of the main slide groove (101) on the end surface of the sliding member (9) with the central axis of the sliding member (9) as the center is equal to the center angle of the projection of the secondary slide groove (111) on the end surface of the sliding member (9) with the central axis of the sliding member (9) as the center, and the above center angle is equal to the center angle of the projection of the discharge channel (121) and the adjacent sample storage hole (501) on the end surface of the sample storage member (5) with the central axis of the sample storage member (5) as the center.

5. A portable sampling device for coal mine exploration according to claim 3, characterized in that: The minimum distance between the sample storage hole (501) and the central axis of the sample storage member (5) is greater than the maximum distance between the liquid discharge channel (121) and the central axis of the sample storage member (5).

6. A portable sampling device for coal mine exploration according to claim 3, characterized in that: Also includes: A mounting ring (13) is slidably connected in the connecting sleeve (4) and is slidably connected to the sample storage member (5); the sample storage member (5) is provided with a first arc groove (131), a first guide groove (132), a second arc groove (133) and a second guide groove (134) which are connected in sequence; the mounting ring (13) slides along the first arc groove (131), the first guide groove (132), the second arc groove (133) and the second guide groove (134); Two shielding sheets (14) are fixedly connected to a side of the mounting ring (13) away from the flexible sleeve (1) and are spline-connected to the connecting sleeve (4); the shielding sheets (14) are sealingly and slidably connected to the intermediate connecting member (6); two sample arrangement holes (141) are provided on the connecting sleeve (4); the sample arrangement holes (141) are connected to adjacent transfer channels (601); and the shielding sheets (14) are used to isolate adjacent transfer channels (601) from adjacent sample arrangement holes (141); An elastic member (15) is fixedly connected to a side of the mounting ring (13) away from the shielding sheet (14), and the elastic member (15) is fixedly connected to the connecting sleeve (4).

7. A portable sampling device for coal mine exploration according to claim 6, characterized in that: In the direction from the drill bit (7) toward the flexible sleeve (1), the maximum distance between the injection channel (701) and the central axis of the drill bit (7) gradually increases.

8. A portable sampling device for coal mine exploration according to claim 6, characterized in that: Also includes: A sealing ring (16) is fixedly connected to the mounting ring (13); the sealing ring (16) is sealingly and slidably connected to the connecting sleeve (4); the connecting sleeve (4), the sample storage member (5), the mounting ring (13) and the sealing ring (16) cooperate to form a liquid accumulation chamber (161); the sample storage member (5) is provided with drainage holes (162) whose number is equal to the sample storage holes (501); the drainage holes (162) connect the adjacent sample storage holes (501) with the liquid accumulation chamber (161); and the elastic member (15) is located in the liquid accumulation chamber (161).

9. A portable sampling device for coal mine exploration according to claim 8, characterized in that: The maximum distance between the drainage hole (162) and the end surface of the liquid accumulation cavity (161) away from the mounting ring (13) is smaller than the generatrix length of the mounting ring (13), so that the mounting ring (13) can block the drainage hole (162).

10. A portable sampling device for coal mine exploration according to claim 8, characterized in that: Also includes: A shielding member (17) is fixedly connected to a side of the sample storage member (5) close to the drill bit (7); the shielding member (17) passes through the intermediate member (6) and is sealed and rotatably connected to the drill bit (7); the shielding member (17) is used to shield the sample inlet channel (701) and the cooling channel (123); the shielding member (17) is provided with connecting holes (171) whose number is equal to the sample storage holes (501); the connecting holes (171) are used to release the shielding member (17) from blocking the sample inlet channel (701).

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