Fixed-point sampling device capable of directly drilling deep hole

Abstract

The utility model belongs to the technical field of coal sample collection, and particularly relates to a direct drilling deep hole fixed point sampling device which comprises a sampling part and a drill bit assembly which are coaxially arranged, the sampling part comprises a core storage barrel, a sampling valve and a sampling barrel, the sampling valve comprises a valve seat, a spherical valve core and a rotating block, and an opening is formed in the spherical valve core; the valve seat is sleeved with the sampling barrel, a mounting hole is formed in the sampling barrel, the rotating block is slidably mounted in the mounting hole, and when the sampling barrel and the valve seat rotate relatively, the relative acting force of the rotating block and the mounting hole can drive the spherical valve element to rotate, and the opening direction of the spherical valve element is changed; the drill bit assembly comprises a large drill bit, and a small drill bit is slidably installed in the large drill bit. When the opening of the spherical valve element is vertical, the outer wall of the spherical valve element abuts against the small drill bit in the large drill bit, and when the opening of the spherical valve element is horizontal, the coal sample and the small drill bit can enter the element storage area through the opening of the spherical valve element; the problems that in the prior art, sampling efficiency is low, and sampling fails due to long-time exposure of collected coal samples are solved.

Description

Technical Field

[0001] This utility model belongs to the field of coal sample collection technology, specifically relating to a device for direct drilling into deep holes for fixed-point sampling. Background Technology

[0002] Coal samples are needed for various purposes in coal mines, including zoning outburst-prone coal seams, collecting basic gas data, and conducting underground assessments and evaluations of surface area management, in order to determine gas content. To meet the growing demand for transparency in underground coal mine disaster management, and to fully utilize the technical advantages of precise directional drilling for targeted sampling, the challenge of safely and efficiently obtaining coal samples from deep boreholes in fractured and soft coal seams is a pressing issue that needs to be addressed.

[0003] Currently, two techniques are commonly used for coal seam borehole sampling: one is to use a solid drill bit to drill into the natural slag discharge wellhead for sampling, and the other is to use a solid drill bit to drill to a predetermined position and then replace it with a coring drill bit for sampling. In the former, due to the varying speeds of drill cuttings during natural slag discharge, some drill cuttings remain in the borehole for extended periods, resulting in significant differences in the source location and retention time of coal samples at the wellhead, leading to severe sample mixing. Even if clearing the borehole before sampling can alleviate this problem, the stress in the coal seam can cause borehole shrinkage, borehole wall damage and detachment, or the drill rod rotor's friction against the borehole wall, all of which can also cause severe sample mixing. The latter method requires timely withdrawal of the hollow sampling tube after it is filled with coal sample. Therefore, if the predetermined position is not reached, a regular solid drill bit must be used to drill to the predetermined position. Then, all drill rods must be withdrawn and disassembled, and the regular solid drill bit must be replaced with a hollow core drill bit (such as the deep hole fixed-point sealed sampling device for coal mines disclosed in patent document CN 220890180U). The tube must then be drilled to the predetermined position to collect the sample. Before sampling, the process of "drilling, withdrawing the drill bit, replacing the drill bit, and drilling again" is required. The process is cumbersome and the sampling efficiency is low. Furthermore, during the time of withdrawing the drill bit and replacing the drill bit, the coal at the predetermined sampling position is exposed to the air for a long time, causing a large amount of gas to be lost. This results in a significant difference between the collected coal sample and the actual situation, leading to sampling failure. Utility Model Content

[0004] The purpose of this invention is to provide a device for direct drilling into deep holes for fixed-point sampling, so as to solve the problems of low sampling efficiency and sampling failure caused by long-term exposure of coal samples in the existing technology.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A device for direct drilling into deep holes for fixed-point sampling includes a sampling section and a drill bit assembly arranged coaxially.

[0007] The sampling unit includes a core storage cylinder, a sampling valve, and a sampling tube. The core storage cylinder has a core storage area for storing coal samples. The sampling valve includes a valve seat, a ball valve core, a connecting pin, and a rotating block. The valve seat is fixed to one end of the core storage cylinder. The ball valve core is rotatably installed inside the valve seat and has an opening that penetrates it. One end of the connecting pin is fixed to the ball valve core, and the other end passes through the valve seat and is fixed to the rotating block. The sampling tube is rotatably sleeved outside the valve seat and has an installation hole. The rotating block is slidably installed in the installation hole. When the sampling tube and the valve seat rotate relative to each other, the rotating block slides in the installation hole. The relative force between the rotating block and the installation hole can drive the ball valve core to rotate, changing the opening direction of the ball valve core.

[0008] The drill bit assembly includes a large drill bit, which is fixedly connected to the sampling cylinder. The large drill bit has a central through hole, and a small drill bit can be slidably installed in the central through hole. The maximum radial dimension of the small drill bit is smaller than the diameter of the ball valve core opening.

[0009] During drilling, the opening of the ball valve core is in a vertical position, and the opening of the ball valve core abuts against the inner wall of the sampling cylinder. The outer wall of the ball valve core presses the small drill bit against the central through hole of the large drill bit. During sampling, the opening of the ball valve core is in a horizontal position, and the coal sample and the small drill bit can enter the core storage area of ​​the core storage cylinder through the sampling cylinder and the ball valve core.

[0010] Furthermore, the central through hole of the large drill bit includes a small diameter section and a large diameter section, the cross-sections of which are circular and hexagonal, respectively; the small drill bit includes a head and a connecting part, the end face of the head is provided with several cutting teeth, the connecting part is fixedly sleeved on the outside of the head, and the connecting part is provided with a cylindrical section and a hexagonal prism section, the cylindrical end and the hexagonal prism section slidingly engaging with the small diameter section and the large diameter section of the central through hole, respectively.

[0011] Furthermore, the mounting hole is shaped like a "⊥" and includes a first mounting hole and a second mounting hole that are interconnected. The first mounting hole and the second mounting hole are respectively arranged along the circumference and axial direction of the sampling cylinder, and the second mounting hole is located on the center line of the first mounting hole. The rotating block is slidably installed in the first mounting hole, and the rotating block is provided with a limiting protrusion that abuts against the wall of the second mounting hole. When the sampling cylinder and the valve seat rotate relative to each other, the rotating block slides in the first mounting hole, and the interaction force between the limiting protrusion and the second mounting hole drives the rotating block and the ball valve core to rotate, changing the opening direction of the ball valve core.

[0012] Furthermore, the mounting hole is elongated and has multiple toothed grooves on its wall. The rotating block has multiple toothed protrusions evenly distributed around its circumference, and the toothed protrusions partially engage with the toothed grooves of the mounting hole. When the sampling cylinder and the valve seat rotate relative to each other, the rotating block slides within the mounting hole. The interaction force between the toothed protrusions and the toothed grooves drives the rotating block and the spherical valve core to rotate, changing the opening direction of the spherical valve core.

[0013] Furthermore, the valve seat is provided with a guide post, and the sampling cylinder is provided with a guide hole. The guide post can be slidably installed in the guide hole. When the opening of the ball valve core is in a horizontal and vertical state, the guide post is located at both ends of the guide hole, respectively.

[0014] Furthermore, a sealing outer cylinder is fixed to the large drill bit, which is sleeved outside the sampling cylinder and the core storage cylinder, and a sealing ring is provided between the sealing outer cylinder and the core storage cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] 1. This utility model organically combines the sampling unit with the drill bit assembly. The drill bit assembly can automatically switch between solid and hollow states at a fixed point. When the drill bit assembly is in solid state, it can cooperate with the drilling rig and drill rod to achieve directional drilling to the sampling point. After reaching the sampling point, the small drill bit of the drill bit assembly enters the core storage cylinder through the sampling valve and automatically switches to hollow state, so that coal seam sampling can be carried out and fixed-point sampling can be completed. Compared with traditional sampling technology, it can effectively save the process and time of "retracting the drill and changing the drill bit", which not only greatly shortens the sampling time and saves a lot of labor and operation time, but also effectively ensures the success rate of sampling.

[0017] 2. This utility model is simple and convenient to operate, saving labor and time, and can improve the coal seam gas extraction effect and inspection accuracy; moreover, apart from the drill bit, no modification is required to the drilling rig, drill rod and drilling process, which not only greatly saves the cost of promotion and application, but also has a wide range of applicability and broad prospects for technology promotion. Attached Figure Description

[0018] Figure 1 These are schematic diagrams of the structures of Embodiment 1 and Embodiment 2 of this utility model;

[0019] Figure 2 This is an exploded view of Embodiment 1 of the present invention;

[0020] Figure 3 This is a partial structural schematic diagram of Embodiment 1 of the present utility model;

[0021] Figure 4 These are the side view and cross-sectional view of Embodiment 1 of this utility model;

[0022] Figure 5 This is a sampling diagram of Embodiment 1 of the present invention;

[0023] Figure 6 This is a partial exploded view of Embodiment 2 of the present invention.

[0024] In the figure: sampling section 100, core storage cylinder 110, core storage area 111, sealing ring 112, sampling valve 120, valve seat 121, ball valve core 122, rotating block 123, limiting protrusion 124, toothed protrusion 125, guide post 126, sampling cylinder 130, mounting hole 131, first mounting hole 132, second mounting hole 133, toothed groove 134, guide hole 135, sealing outer cylinder 140, drill bit assembly 200, large drill bit 210, central through hole 211, small drill bit 220, head 221, connecting part 222, connecting head 300. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method:

[0026] Example 1

[0027] like Figure 1 As shown, a device for direct drilling into deep holes for fixed-point sampling includes a sampling section 100 and a drill bit assembly 200 arranged coaxially.

[0028] like Figure 2-5 As shown, the sampling unit 100 includes a core storage cylinder 110, a sampling valve 120, and a sampling tube 130. The core storage cylinder 110 has a core storage area 111 for storing coal samples. A connector 300 is threaded to the right end of the core storage cylinder 110, used to connect a drill rod. The sampling valve 120 includes a valve seat 121, a ball valve core 122, a connecting pin, and a rotating block 123. The right end of the valve seat 121 is fixed to the left end of the core storage cylinder 110. The ball valve core 122 is rotatably mounted inside the valve seat 121. An opening is formed through the ball valve core 122. One end of the connecting pin is fixed to the ball valve core 122, and the other end passes through the valve seat 121 and is fixed to the rotating block 123. A limit protrusion 124 is formed on the rotating block 123. The sampling tube 130 is rotatably sleeved on the valve seat 120. Outside 21, the sampling cylinder 130 has a mounting hole 131 in the shape of "⊥". The mounting hole 131 includes a first mounting hole 132 and a second mounting hole 133 that are interconnected. The first mounting hole 132 and the second mounting hole 133 are respectively arranged along the circumference and axial direction of the sampling cylinder 130. The second mounting hole 133 is located on the center line of the first mounting hole 132. The rotating block 123 is slidably installed in the first mounting hole 132. The limiting protrusion 124 on the rotating block 123 abuts against the hole wall of the second mounting hole 133. When the sampling cylinder 130 and the valve seat 121 rotate relative to each other, the rotating block 123 slides in the first mounting hole 132. The interaction force between the limiting protrusion 124 and the second mounting hole 133 drives the rotating block 123 and the ball valve core 122 to rotate, changing the opening direction of the ball valve core 122.

[0029] like Figure 2 and 4As shown, the drill bit assembly 200 includes a large drill bit 210 and a small drill bit 220. The large drill bit 210 is fixedly connected to the left end of the sampling cylinder 130. The large drill bit 210 has a central through hole 211, which includes a small diameter section and a large diameter section. The cross-sections of the small diameter section and the large diameter section are circular and regular hexagonal, respectively. The small drill bit 220 includes a head 221 and a connecting part 222. Several cutting teeth are formed on the left end face of the head 221 of both the large drill bit 210 and the small drill bit 220. The connecting part 222 is fixedly sleeved outside the head 221. The connecting part 222 has a cylindrical section and a hexagonal prism section. The cylindrical end and the hexagonal prism section slide with the small diameter section and the large diameter section of the central through hole 211, respectively, so that the small drill bit 220 can be slidably installed inside the large drill bit 210. The maximum radial dimension of the small drill bit 220 is smaller than the diameter of the opening of the ball valve core 122.

[0030] In use, this sampling device is connected to the drilling rig and drill rod. Initially, the sampling valve 120 is closed, the rotating block 123 is located at one end of the first mounting hole 132, the opening of the ball valve core 122 is vertical, and the opening of the ball valve core 122 abuts against the inner wall of the sampling cylinder 130. The outer wall of the ball valve core 122 presses the small drill bit 220 against the central through hole 211 of the large drill bit 210, and the drill bit assembly 200 is in a solid state. At this time, the drill rod can be pushed forward by the drilling rig to achieve directional drilling. After directional drilling is completed, the drilling rig and drill rod push the drill bit assembly 200 to a solid state. The drill bit assembly 200 and sampling cylinder 130 are fixed in place by pressing against the rock wall in front. Simultaneously, the drill rod's rotation direction is changed by the drilling rig, causing the core storage cylinder 110 and valve seat 121 to rotate in the opposite direction. This results in relative rotation between the valve seat 121 and the sampling cylinder 130, causing the rotating block 123 to slide from one end of the first mounting hole 132 to the other. During this sliding process, the wall of the second mounting hole 133 pushes the limiting protrusion 124, causing the rotating block 123 to rotate along its own centerline. This rotates the opening of the spherical valve core 122 to a horizontal position, opening the sampling valve 120 (e.g., ...). Figure 4 (As shown); the drilling rig continues to reverse and advance to collect samples. Under the action of the thrust, the coal sample and the small drill bit 220 enter the core storage cylinder 110 through the opening of the ball valve core 122 (as shown). Figure 5 As shown), when the drilling rig's advance stroke is greater than the total length of this sampling device, the sampling is completed. At this time, the drilling rig's rotation direction is changed again, causing the drill rod, core storage cylinder 110, and valve seat 121 to rotate in the forward direction. The sampling cylinder 130 and valve seat 121 rotate relative to each other, causing the rotating block 123 to slide back to its initial position. During the sliding reset process, the hole wall of the second mounting hole 133 pushes the limiting protrusion 124 to make the rotating block 123 rotate. The opening of the ball valve core 122 rotates accordingly and returns to the vertical state, and the sampling valve 120 closes.

[0031] This utility model organically combines the sampling unit 100 with the drill bit assembly 200. The drill bit assembly 200 can automatically switch between solid and hollow states to complete the fixed-point sampling work, effectively saving the process and time of "removing the drill and changing the drill bit". This not only greatly shortens the sampling time and saves a lot of labor and operation time, but also effectively ensures the success rate of sampling.

[0032] like Figure 2 and 3 As shown, the sampling cylinder 130 has two symmetrical guide holes 135, and the valve seat 121 has two sets of guide members symmetrically fixed on it. Each set of guide members includes two guide posts 126. The two sets of guide members can be slidably installed in the two guide holes 135 respectively. When the opening of the ball valve core 122 is in a horizontal or vertical state, the two sets of guide members are located at the two ends of the guide holes 135 respectively.

[0033] like Figure 2 and 4 As shown, a sealing outer cylinder 140 is fixed to the large drill bit 210 by screws. The sealing outer cylinder 140 is sleeved outside the sampling cylinder 130 and part of the core storage cylinder 110. A sealing ring 112 is fixed between the sealing outer cylinder 140 and the core storage cylinder 110. The sealing ring 112 is used to enhance the airtightness between the core storage cylinder 110 and the sealing outer cylinder 140, and prevent external debris from entering the core storage cylinder 110 and affecting the test results of the coal sample.

[0034] The specific implementation is as follows:

[0035] 1. Connect the drill rod and drilling rig to the sampling device of this utility model through the connector 300 to form a whole. At this time, the sampling valve 120 is closed.

[0036] 2. Start the drilling rig. The drilling rig will drive the sampling device to rotate forward and advance through the drill rod until the sampling device reaches the sampling point.

[0037] 3. Change the output direction of the drilling rig to open the sampling valve 120. The drilling rig will continue to reverse and advance to sample. When the advance stroke of the drilling rig exceeds the total length of this sampling device, the sampling is completed. Change the output direction of the drilling rig again to make the drill rod rotate in the forward direction and close the sampling valve 120. The coal sample is sealed and stored in the core storage area 111.

[0038] 4. Maintain the output direction of the drilling rig and keep the drill rod rotating in the forward direction. Retract the drill rod one by one until the sampling device is retrieved to the drilling rig. Remove the sampling device from the drill rod to analyze the coal sample and obtain the coal sample information at the sampling point.

[0039] This utility model is simple and convenient to operate, saving labor and time, and can improve the efficiency and accuracy of coal seam gas extraction. In addition, apart from the drill bit, no modifications are required to the drilling rig, drill rod, or drilling process. This not only greatly saves the cost of promotion and application, but also has a wide range of applicability and broad prospects for technology promotion.

[0040] Example 2

[0041] like Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that: the mounting hole 131 of the sampling cylinder 130 is elongated, and multiple toothed grooves 134 are opened along the hole wall of the mounting hole 131. Multiple toothed protrusions 125 are evenly distributed circumferentially on the side wall of the rotating block 123, and some of the toothed protrusions 125 are engaged in the toothed grooves 134 of the mounting hole 131. When the sampling cylinder 130 and the valve seat 121 rotate relative to each other, the rotating block 123 slides in the mounting hole 131. The interaction force between the toothed protrusions 125 and the toothed grooves 134 drives the rotating block 123 and the ball valve core 122 to rotate, changing the opening direction of the ball valve core 122.

[0042] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for direct drilling into deep holes for fixed-point sampling, comprising a sampling unit (100) and a drill bit assembly (200) arranged coaxially, characterized in that: The sampling unit (100) includes a core storage cylinder (110), a sampling valve (120), and a sampling tube (130). The core storage cylinder (110) has a core storage area (111) for storing coal samples. The sampling valve (120) includes a valve seat (121), a ball valve core (122), a connecting pin, and a rotating block (123). The valve seat (121) is fixed to one end of the core storage cylinder (110). The ball valve core (122) is rotatably installed in the valve seat (121). The ball valve core (122) has an opening that penetrates the ball valve core (122). One end of the connecting pin is fixed to the ball valve core (122). The other end of the connecting pin passes through the valve seat (121) and is fixed on the rotating block (123); the sampling cylinder (130) is rotatably sleeved outside the valve seat (121), and the sampling cylinder (130) is provided with a mounting hole (131). The rotating block (123) can be slidably installed in the mounting hole (131). When the sampling cylinder (130) and the valve seat (121) rotate relative to each other, the rotating block (123) slides in the mounting hole (131). The relative force between the rotating block (123) and the mounting hole (131) can drive the ball valve core (122) to rotate and change the opening direction of the ball valve core (122). The drill bit assembly (200) includes a large drill bit (210), which is fixedly connected to the sampling cylinder (130). The large drill bit (210) has a central through hole (211), and a small drill bit (220) is slidably installed in the central through hole (211). The maximum radial dimension of the small drill bit (220) is smaller than the diameter of the opening of the ball valve core (122). During drilling, the opening of the ball valve core (122) is in a vertical position, and the opening of the ball valve core (122) abuts against the inner wall of the sampling cylinder (130). The outer wall of the ball valve core (122) presses the small drill bit (220) against the central through hole (211) of the large drill bit (210). During sampling, the opening of the ball valve core (122) is in a horizontal position, and the coal sample and the small drill bit (220) can enter the core storage area (111) of the core storage cylinder (110) through the sampling cylinder (130) and the ball valve core (122).

2. The device for direct drilling deep hole fixed-point sampling according to claim 1, characterized in that: The central through hole (211) of the large drill bit (210) includes a small diameter section and a large diameter section, the cross-sections of which are circular and hexagonal, respectively; the small drill bit (220) includes a head (221) and a connecting part (222), the end face of the head (221) is provided with several cutting teeth, the connecting part (222) is fixedly sleeved outside the head (221), the connecting part (222) is provided with a cylindrical section and a hexagonal prism section, the cylindrical end and the hexagonal prism section are respectively slidably engaged with the small diameter section and the large diameter section of the central through hole (211).

3. The device for direct drilling deep hole fixed-point sampling according to claim 2, characterized in that: The mounting hole (131) is in the shape of a "⊥" and includes a first mounting hole (132) and a second mounting hole (133) that are interconnected. The first mounting hole (132) and the second mounting hole (133) are respectively arranged along the circumferential and axial directions of the sampling cylinder (130). The second mounting hole (133) is located on the center line of the first mounting hole (132). The rotating block (123) is slidably installed in the first mounting hole (132). 3) A limiting protrusion (124) is provided on the upper part, and the limiting protrusion (124) abuts against the wall of the second mounting hole (133); when the sampling cylinder (130) and the valve seat (121) rotate relative to each other, the rotating block (123) slides in the first mounting hole (132), and the interaction force between the limiting protrusion (124) and the second mounting hole (133) drives the rotating block (123) and the ball valve core (122) to rotate, changing the opening direction of the ball valve core (122).

4. The device for direct drilling deep hole fixed-point sampling according to claim 2, characterized in that: The mounting hole (131) is elongated, and the wall of the mounting hole (131) is provided with multiple toothed grooves (134). The rotating block (123) is evenly distributed with multiple toothed protrusions (125) in the circumferential direction. The toothed protrusions (125) partially engage with the toothed grooves (134) of the mounting hole (131). When the sampling cylinder (130) and the valve seat (121) rotate relative to each other, the rotating block (123) slides in the mounting hole (131). The interaction force between the toothed protrusions (125) and the toothed grooves (134) drives the rotating block (123) and the ball valve core (122) to rotate, changing the opening direction of the ball valve core (122).

5. The device for direct drilling deep hole fixed-point sampling according to any one of claims 3 or 4, characterized in that: The valve seat (121) is provided with a guide post (126), and the sampling cylinder (130) is provided with a guide hole (135). The guide post (126) can be slidably installed in the guide hole (135). When the opening of the ball valve core (122) is in a horizontal and vertical state, the guide post (126) is located at both ends of the guide hole (135).

6. The device for direct drilling deep hole fixed-point sampling according to claim 5, characterized in that: A sealing outer cylinder (140) is fixed on the large drill bit (210). The sealing outer cylinder (140) is sleeved outside the sampling cylinder (130) and the core storage cylinder (110). A sealing ring (112) is provided between the sealing outer cylinder (140) and the core storage cylinder (110).

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