A high-sealing core pressure-maintaining sampler and a use method thereof

Abstract

The application discloses a high-sealing core pressure-maintaining sampler and a use method thereof, and is applied to the technical field of core sampling equipment.The bidirectional driving motor is started to drive gear engagement plates to rotate, the gear engagement plates are engaged with transmission gears, the threaded transmission ring can rotate in the first protective shell, the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe are driven to rotate downwards along the core hole of the drilling machine, the first threaded drill pipe is arranged to drill the core, the portability of the sampler is improved, the core in a deeper layer can be drilled, the flexibility of the sampler is improved, and the sampler can be used in geological investigation experiments, mine and oil field working environments and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of core sampling equipment, and particularly relates to a high-sealing core pressure-maintaining sampler and a use method. BACKGROUND

[0002] In the early exploration of shale gas, many scientific research works cannot be separated from core flow experiments. The test object of the core flow experiment is a core, and the core is a cylindrical rock sample taken out by using a core annular drill bit and other coring tools, and is important physical material for studying geological and mineral conditions.

[0003] At present, a shale gas and core pressure-maintaining sealing sampler is disclosed in Chinese patent CN105569594A, which is composed of a fishing mechanism, a spring clamping positioning mechanism, a suspension single-action mechanism, a to-position signaling mechanism, an upper end sealing mechanism, a core tube, a core clamping mechanism and a lower end sealing mechanism, and the fishing mechanism, the spring clamping positioning mechanism, the suspension single-action mechanism, the to-position signaling mechanism, the upper end sealing mechanism, the core tube, the core clamping mechanism and the lower end sealing mechanism are sequentially arranged together. From being put into a well before drilling to taking out a core, the following processes are sequentially experienced: to-position, signaling, upper end sealing, clamping core, lower end sealing and fishing. The present application has low cost, sealing function, convenient operation and high success rate, and can discharge gas originally existing in the core tube, reduce interference on shale gas composition, adopt a wireline coring mode, and the core tube has a channel for flowing of drilling fluid during the sampler putting process, and can alarm after being positioned, and the putting process can be accelerated.

[0004] The existing core sampling equipment is mainly divided into two categories. One is a large-scale drilling mechanical device which can drill a core sample at a depth of several kilometers underground, but the large-scale drilling mechanical device has high drilling cost and poor flexibility, and can be usually applied to some mines and oil fields. For a geological investigation experiment with strong flowability, the large-scale drilling mechanical device is obviously incompetent. The other is a small device which samples a core by a manual drilling mode. Although the device is convenient to carry, the device can only sample a soft rock plate core by the manual drilling mode, and the existing core container in the sampler has poor sealing performance. When the core sample is taken out to the ground, the core is easily broken due to different pressures of the ground and the surface, and the research on the core by researchers is affected. Therefore, the present application provides a high-sealing core pressure-maintaining sampler. SUMMARY

[0005] The present application aims to provide a high-sealing core pressure-maintaining sampler and a use method, which has the advantages that the maximum drilling depth of the sampler can be extended according to the depth of a core hole, the portability of the sampler is improved, the sampler can drill a relatively deep core, the sealing performance and internal pressure of the sampler when the core is taken out are maintained, and the like.

[0006] The technical problem of the present application is solved by the following technical scheme: a high-sealing core pressure-maintaining sampler, comprising a first threaded drill pipe, a second threaded drill pipe arranged at the top of the first threaded drill pipe, and a third threaded drill pipe arranged at the top of the second threaded drill pipe, wherein the bottoms of the second threaded drill pipe and the third threaded drill pipe are welded with threaded connectors respectively threadedly connected with the first threaded drill pipe and the second threaded drill pipe, the surfaces of the first threaded drill pipe and the second threaded drill pipe are provided with a transmission mechanism, and the inside of the first threaded drill pipe is provided with a sampling mechanism.

[0007] By aligning the threaded connectors at the bottoms of the second threaded drill pipe and the third threaded drill pipe with the tops of the first threaded drill pipe and the second threaded drill pipe and rotating, the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe can become an integral whole, and the maximum length of the first threaded drill pipe can be extended by continuously connecting new threaded drill pipes at the top of the third threaded drill pipe, so as to extend the maximum drilling depth of the sampler according to the depth of the core hole, thereby extracting core samples at different depths, and the threaded drill pipes can be easily carried by being disassembled. By turning on the bidirectional driving motor to drive the gear engagement plate to rotate, the threaded transmission ring can be rotated in the first protective shell after the gear engagement plate is engaged with the transmission gear, thereby driving the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe to rotate downward along the core hole previously opened by the drilling machine, and the first threaded drill pipe is arranged to drill the core, so as to improve the portability of the sampler and drill deeper cores, thereby improving the flexibility of the sampler and enabling it to be used in geological exploration experiments with strong fluidity and in mine, oil field and other working environments. The core is drilled by the first threaded drill pipe, the top sealing baffle is lifted, the sealing baffle is attached to the inside of the baffle groove after being opened, and the torsion spring is twisted by the second rotating rod, so as to drill the core into the inside of the core container, then the core is clamped and broken by the core clamp plate, the return force generated by the twisted torsion spring drives the second rotating rod to control the reset of the sealing baffle, and the bottom of the core container is sealed, so as to maintain the sealing and internal pressure of the sampler when the core is taken out, thereby reducing the risk of core rupture due to different pressures of the ground and the surface when the core is taken out. It is also convenient for storing the core.

[0008] The application is further provided with: the transmission mechanism comprises a first protective shell arranged on the surface of the first threaded drill pipe and the second threaded drill pipe, a second protective shell is bolted on one side of the first protective shell, a bidirectional driving motor is fixedly installed in the second protective shell, a gear meshing plate is fixedly installed on the output end of the bidirectional driving motor, a threaded transmission ring is slidably connected in the first protective shell and is threadedly connected with the first threaded drill pipe and the second threaded drill pipe, and a transmission gear meshing with the gear meshing plate is fixedly connected to the surface of the threaded transmission ring.

[0009] The above technical scheme improves the portability of the sampler and can drill deeper rock cores, thereby improving the flexibility of the sampler and enabling the sampler to be used in geological exploration experiments, mine and oil field working environments with strong fluidity.

[0010] The application is further provided with: the sampling mechanism comprises a core container arranged in the first threaded drill pipe, a sealing cover is threadedly connected to the top of the inner cavity of the core container, a baffle groove is formed in the bottom of the core container, a second rotating rod is rotatably connected in the baffle groove, a sealing baffle is fixedly connected to the surface of the second rotating rod, torsion springs are fixedly connected to the two sides of the second rotating rod, and sealing gaskets are bonded to the two sides of the sealing baffle.

[0011] The above technical scheme can maintain the sealing performance and internal pressure of the sampler when the rock core is taken out, thereby reducing the risk of core breakage due to different ground and surface pressures when the core is taken out. Meanwhile, the core can be conveniently stored.

[0012] The application is further provided with: the second protective shell is fixedly installed with a protective net cooperating with the bidirectional driving motor away from the first protective shell, and sliding gaskets are slidably connected to the top and bottom of the threaded transmission ring and bonded to the first protective shell.

[0013] The above technical scheme prevents sundries from entering the interior of the second protective shell to damage the operation of the bidirectional driving motor, and the threaded transmission ring can rotate more smoothly through the sliding gaskets connecting the threaded transmission ring and the first protective shell.

[0014] The application is further provided with: the first protective shell is bolted with a connecting buckle on the surface of the bottom, a supporting leg is rotatably connected in the connecting buckle, and a supporting bottom plate is welded to the end of the supporting leg away from the connecting buckle.

[0015] The above technical scheme can support the sampler when it is placed on the ground, thereby improving the stability of the sampler during operation.

[0016] The first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe are all provided with a positioning insertion hole penetrating the top of the threaded connection head, and a positioning insertion rod is inserted into the positioning insertion hole.

[0017] The above technical solution improves the tightness of the connection between the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe.

[0018] The first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe are all provided with a positioning insertion hole penetrating the top of the threaded connection head, and a positioning insertion rod is inserted into the positioning insertion hole.

[0019] The above technical solution can position the movement of the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe for the second time, thereby improving the stability of the movement of the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe.

[0020] The first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe are all provided with a positioning insertion hole penetrating the top of the threaded connection head, and a positioning insertion rod is inserted into the positioning insertion hole.

[0021] The above technical solution can position the movement of the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe for the second time, thereby improving the stability of the movement of the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe.

[0022] The first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe are all provided with a positioning insertion hole penetrating the top of the threaded connection head, and a positioning insertion rod is inserted into the positioning insertion hole.

[0023] The above technical solution can position the movement of the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe for the second time, thereby improving the stability of the movement of the first threaded drill pipe, the second threaded drill pipe and the third threaded drill pipe.

[0024] A use method of the high-sealing rock core pressure-maintaining sampler includes the following steps:

[0025] Step 1. Machine drilling, by respectively aligning the threaded connectors at the bottom of the second threaded drill pipe and the third threaded drill pipe with the top of the first threaded drill pipe and the second threaded drill pipe, and rotating, the first threaded drill pipe and the second threaded drill pipe and the third threaded drill pipe become one whole, then the bidirectional drive motor is started to drive the gear engagement plate to rotate, the gear engagement plate is engaged with the transmission gear, the threaded transmission ring can rotate in the first protective shell, thereby driving the first threaded drill pipe and the second threaded drill pipe and the third threaded drill pipe to rotate downward along the core hole previously opened by the drilling machine, and by continuously connecting new threaded drill pipes at the top of the third threaded drill pipe, the maximum downhole depth of the first threaded drill pipe is extended.

[0026] Step 2. Core sampling, when the first threaded drill pipe drills to the bottom of the core hole, the bidirectional drive motor is continuously started to drive the gear engagement plate to rotate, the gear engagement plate is engaged with the transmission gear, the threaded transmission ring can rotate in the first protective shell, thereby driving the first threaded drill pipe to drill the core, the top of the core lifts the sealing baffle, the sealing baffle is opened and fits into the baffle groove, and the second rotating rod drives the torsion spring to twist, thereby drilling the core into the core container.

[0027] Step 3. Core extraction, by starting the bidirectional drive motor in reverse rotation, the gear engagement plate is engaged with the transmission gear, the threaded transmission ring can rotate in the first protective shell in reverse, thereby driving the first threaded drill pipe to move downward in the core hole, then the core is clamped and broken by the core clamp plate, the restoring force generated by the torsion spring after twisting drives the second rotating rod to control the sealing baffle to reset, the bottom of the core container is sealed, the core is sealed in the core container, finally the first threaded drill pipe is returned to the ground by the first protective shell, the first threaded drill pipe is disassembled, and the internal core container is taken out.

[0028] In summary, the present application has the following beneficial effects:

[0029] By respectively aligning the threaded connectors at the bottom of the second threaded drill pipe and the third threaded drill pipe with the top of the first threaded drill pipe and the second threaded drill pipe, and rotating, the first threaded drill pipe and the second threaded drill pipe and the third threaded drill pipe can become one whole, and by continuously connecting new threaded drill pipes at the top of the third threaded drill pipe, the maximum length of the first threaded drill pipe is extended, which achieves the purpose of extending the maximum downhole depth of the sampler according to the depth of the core hole, thereby the core samples at different depths can be extracted, and the threaded drill pipes can be disassembled for easy carrying.

[0030] By activating the bidirectional drive motor to rotate the gear meshing plate, the gear meshing plate engages with the transmission gear, allowing the threaded transmission ring to rotate inside the first protective housing. This, in turn, drives the first, second, and third threaded drill pipes downwards along the pre-drilled core hole of the drilling rig. The first threaded drill pipe then drills the core, improving the portability of the sampler while also enabling the drilling of deeper cores. This enhances the sampler's flexibility, making it suitable for use in highly mobile geological research experiments and working environments such as mines and oil fields.

[0031] Drilling is performed using the first threaded drill pipe to raise the sealing baffle at the top of the core. Once the baffle opens, it fits into the groove inside the baffle. A second rotating rod drives a torsion spring, which twists to insert the core into the core container. The core is then clamped by a core clamp plate. The rebound force generated by the twisted torsion spring drives the second rotating rod to reset the sealing baffle, sealing the bottom of the core container. This system maintains the seal and internal pressure during core extraction, reducing the risk of core breakage due to pressure differences between the ground and the surface. It also facilitates core storage. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0033] Figure 2 This is a structural cross-sectional view of the present invention;

[0034] Figure 3 This is a top sectional view of the core container structure of the present invention;

[0035] Figure 4 This is the invention Figure 2 Enlarged view of point A in the image;

[0036] Figure 5 This is the invention Figure 2 Enlarged view of point B in the image;

[0037] Figure 6 This is a top sectional view of a partial structure of the present invention.

[0038] Mark No. : 1, first threaded drill pipe; 2, second threaded drill pipe; 3, third threaded drill pipe; 4, threaded connector; 5, protective net; 6, connecting buckle; 7, supporting leg; 8, supporting bottom plate; 9, sliding gasket; 10, positioning insertion hole; 11, positioning insertion rod; 12, first rotating rod; 13, positioning rotating wheel; 14, limiting clamping block; 15, limiting clamping groove; 16, core clamp plate; 17, drilling tooth; 18, diameter limiting ring block; 19, limiting sliding groove; 101, first protective shell; 102, second protective shell; 103, bidirectional driving motor; 104, gear meshing plate; 105, threaded transmission ring; 106, transmission gear; 201, core container; 202, baffle groove; 203, sealing cover; 204, second rotating rod; 205, torsion spring; 206, sealing baffle; 207, sealing gasket. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with the drawings. Example 1

[0040] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5The utility model provides a kind of high sealing core pressure maintaining sampler, including first threaded drill pipe 1, the top of first threaded drill pipe 1 is provided with second threaded drill pipe 2, the top of second threaded drill pipe 2 is provided with third threaded drill pipe 3, the bottom of second threaded drill pipe 2 and third threaded drill pipe 3 is welded with threaded connector 4 respectively with first threaded drill pipe 1 and second threaded drill pipe 2 thread connection, the surface of first threaded drill pipe 1 and second threaded drill pipe 2 is provided with transmission mechanism, the inside of first threaded drill pipe 1 is provided with sampling mechanism, by respectively aligning the threaded connector 4 of the bottom of second threaded drill pipe 2 and third threaded drill pipe 3 with the top of first threaded drill pipe 1 and second threaded drill pipe 2, and rotating, first threaded drill pipe 1 and second threaded drill pipe 2 and third threaded drill pipe 3 can become a whole, and by constantly connecting new threaded drill pipe on the top of third threaded drill pipe 3, the maximum length of first threaded drill pipe 1 is set, the maximum downhole depth of sampler can be extended according to the depth of core hole, so that core samples of different depths can be extracted, and threaded drill pipe can be separated to facilitate carrying. By opening bidirectional drive motor 103, gear engagement plate 104 is driven to rotate, gear engagement plate 104 is engaged with transmission gear 106, so that threaded transmission ring 105 can rotate in the inside of first protective shell 101, so as to drive first threaded drill pipe 1, second threaded drill pipe 2 and third threaded drill pipe 3 to rotate downward along the core hole previously opened by drilling machine, the setting of first threaded drill pipe 1 drilling core, improve the portability of sampler while drilling deeper core, so as to improve the flexibility of sampler, which can be used in geological exploration experiments with strong fluidity and working environments such as mine, oil field and the like.

[0041] Reference Figure 1 、 Figure 2 Transmission mechanism includes first protective shell 101 arranged on the surface of the end of first threaded drill pipe 1 and second threaded drill pipe 2 close to each other, second protective shell 102 is bolted on one side of first protective shell 101, bidirectional drive motor 103 is fixedly installed in the inside of second protective shell 102, gear engagement plate 104 is fixedly installed on the output end of bidirectional drive motor 103, threaded transmission ring 105 is slidably connected in the inside of first protective shell 101 and is threadedly connected with first threaded drill pipe 1 and second threaded drill pipe 2, transmission gear 106 is fixedly connected on the surface of threaded transmission ring 105 and is engaged with gear engagement plate 104, improve the portability of sampler while drilling deeper core, so as to improve the flexibility of sampler, which can be used in geological exploration experiments with strong fluidity and working environments such as mine, oil field and the like.

[0042] Reference Figure 1 、 Figure 2The second protective shell 102 is fixedly installed on one side away from the first protective shell 101, and is provided with a protective net 5 which is used in cooperation with the bidirectional driving motor 103; the top and bottom of the threaded transmission ring 105 are slidably connected with sliding gaskets 9 which are bonded to the first protective shell 101, so as to prevent sundries from entering the interior of the second protective shell 102 and damaging the bidirectional driving motor 103, and the connection between the threaded transmission ring 105 and the first protective shell 101 through the sliding gaskets 9 makes the threaded transmission ring 105 rotate more smoothly.

[0043] With reference to Figure 1 , Figure 2 , Figure 4 The top of the first threaded drill pipe 1, the second threaded drill pipe 2 and the third threaded drill pipe 3 is provided with a positioning insertion hole 10 which penetrates the interior of the threaded connector 4, and a positioning insertion rod 11 is inserted into the positioning insertion hole 10, so as to improve the tightness of the connection between the first threaded drill pipe 1, the second threaded drill pipe 2 and the third threaded drill pipe 3.

[0044] With reference to Figure 1 , Figure 2 , Figure 4 The first protective shell 101 is rotatably connected with a first rotating rod 12, and the surface of the first rotating rod 12 is fixedly sleeved with a positioning rotating wheel 13 which is slidably connected with the first threaded drill pipe 1, the second threaded drill pipe 2 and the third threaded drill pipe 3, so as to position the movement of the first threaded drill pipe 1, the second threaded drill pipe 2 and the third threaded drill pipe 3 for the second time, and improve the stability of the movement of the first threaded drill pipe 1, the second threaded drill pipe 2 and the third threaded drill pipe 3.

[0045] Brief description of the use process: when the maximum drilling depth of the sampler needs to be extended according to the depth of the core hole and the portability of the sampler is improved, and the core is drilled deeper, the threaded connectors 4 at the bottom of the second threaded drill pipe 2 and the third threaded drill pipe 3 are respectively aligned with the top of the first threaded drill pipe 1 and the second threaded drill pipe 2, and are rotated to make the first threaded drill pipe 1 and the second threaded drill pipe 2 and the third threaded drill pipe 3 into a whole, then the bidirectional drive motor 103 is started to drive the gear engagement plate 104 to rotate, and after the gear engagement plate 104 is engaged with the transmission gear 106, the threaded transmission ring 105 can rotate inside the first protective shell 101, thereby driving the first threaded drill pipe 1, the second threaded drill pipe 2 and the third threaded drill pipe 3 to rotate downward along the core hole previously opened by the drilling machine, and by continuously connecting new threaded drill pipes at the top of the third threaded drill pipe 3, the maximum drilling depth of the first threaded drill pipe 1 can be extended, and by continuing to rotate the bidirectional drive motor 103 to drive the gear engagement plate 104 when the first threaded drill pipe 1 is drilled to the bottom of the core hole, the gear engagement plate 104 is engaged with the transmission gear 106, and the threaded transmission ring 105 can rotate inside the first protective shell 101, thereby driving the first threaded drill pipe 1 to drill the core, lifting the sealing baffle 206 at the top of the core, and after the sealing baffle 206 is opened and fitted into the baffle groove 202, the second rotating rod 204 drives the torsion spring 205 to twist, thereby drilling the core into the core container 201. Example 2:

[0046] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The utility model provides a kind of high sealing core pressure maintaining sampler, including first threaded drill pipe 1, the top of first threaded drill pipe 1 is provided with second threaded drill pipe 2, the top of second threaded drill pipe 2 is provided with third threaded drill pipe 3, the bottom of second threaded drill pipe 2 and third threaded drill pipe 3 is welded with respectively screw joint of first threaded drill pipe 1 and second threaded drill pipe 2 Threaded connector 4 is connected, the surface of first threaded drill pipe 1 and second threaded drill pipe 2 is provided with transmission mechanism, the inside of first threaded drill pipe 1 is provided with sampling mechanism, core is drilled to first threaded drill pipe 1, makes the top of core lift sealing baffle 206, makes sealing baffle 206 open and stick into the inside of baffle recess 202 after opening and is twisted by second rotating rod 204 with torsion spring 205, to drill into the inside of core container 201 with core, then the core is clamped by core clamp plate 16 Break, the restoring force of torsion spring 205 is brought after being twisted, and second rotating rod 204 is controlled sealing baffle 206 reset, the bottom of core container 201 is sealed, the function of maintaining the sealing and internal pressure when sampler removes core is reached, so as to reduce the risk of rupture when core is removed due to the pressure difference between ground and surface. It is also convenient for core storage.

[0047] Reference Figure 2 、 Figure 3 、 Figure 5 The sampling mechanism includes a core container 201 disposed inside the first threaded drill pipe 1, a sealing cover 203 threadedly connected to the top of the inner cavity of the core container 201, a baffle recess 202 formed in the bottom of the core container 201, a second rotating rod 204 rotatably connected inside the baffle recess 202, a sealing baffle 206 fixedly connected to the surface of the second rotating rod 204, torsion springs 205 fixedly connected to the two sides of the sealing baffle 206 and fixedly connected to the second rotating rod 204, and sealing gaskets 207 bonded to the two sides of the sealing baffle 206. The sealing cover 203, the baffle recess 202, the second rotating rod 204, the sealing baffle 206, the torsion springs 205, and the sealing gaskets 207 can maintain the sealing and internal pressure when the sampler removes the core, thereby reducing the risk of rupture when the core is removed due to the pressure difference between the ground and the surface. It is also convenient for core storage.

[0048] Reference Figure 1 、 Figure 2 The surface of the bottom of the first protective shell 101 is bolted with a connecting buckle 6, the inside of the connecting buckle 6 is rotatably connected with a supporting leg 7, and the end away from the connecting buckle 6 of the supporting leg 7 is welded with a supporting bottom plate 8. The connecting buckle 6, the supporting leg 7, and the supporting bottom plate 8 can support the sampler when it is on the ground, improving the stability of the sampler when it is working.

[0049] Reference Figure 2 、 Figure 4 、 Figure 6, the first threaded drill pipe 1 is welded with a limiting block 14 inside, the surface of the core container 201 is provided with a limiting slot 15 for clamping the limiting block 14, the surface of the core container 201 is also provided with a limiting sliding groove 19 communicated with the limiting slot 15, the core container 201 is rotated to drive the limiting block 14 to slide in the limiting slot 15 to the position of the limiting sliding groove 19, so that the core container 201 is pulled out of the first threaded drill pipe 1 by sliding the limiting block 14 in the limiting sliding groove 19, and vice versa.

[0050] Reference Figure 1 , Figure 2 , Figure 5 , the bottom of the first threaded drill pipe 1 is welded with a drilling tooth 17, the bottom of the inner cavity of the first threaded drill pipe 1 is welded with a limiting ring block 18, the inner cavity of the core container 201 is welded with a core clamp plate 16, the drilling tooth 17 is arranged to facilitate the downward drilling of the first threaded drill pipe 1, the limiting ring block 18 is arranged to limit the diameter of the core to ensure that it can enter the inside of the core container 201, and the core clamp plate 16 is arranged to clamp the bottom of the core when the first threaded drill pipe 1 moves upward.

[0051] Brief description of the use process: when it is necessary to maintain the sealing and internal pressure of the core taken out by the sampler, the bidirectional driving motor 103 is started in reverse rotation, so that the gear engagement plate 104 is engaged with the transmission gear 106, the threaded transmission ring 105 can be reversely rotated in the first protective shell 101, thereby driving the first threaded drill pipe 1 to move downward in the core hole, then the core is clamped by the core clamp plate 16, the return force of the torsion spring 205 after being twisted drives the second rotating rod 204 to control the sealing baffle 206 to reset, the bottom of the core container 201 is sealed, the core is sealed in the inside of the core container 201, finally the first threaded drill pipe 1 is driven by the first protective shell 101 to return to the ground, the first threaded drill pipe 1 is disassembled, and then the core container 201 inside is taken out.

Claims

1. A high-sealing core pressure-maintaining sampler, comprising a first threaded drill pipe (1), characterized in that: The top of the first threaded drill tube (1) is provided with a second threaded drill tube (2), the top of the second threaded drill tube (2) is provided with a third threaded drill tube (3), the bottom of the second threaded drill tube (2) and the third threaded drill tube (3) are both welded with threaded connectors (4) that are threadedly connected to the first threaded drill tube (1) and the second threaded drill tube (2) respectively, the surface of the first threaded drill tube (1) and the second threaded drill tube (2) is provided with a transmission mechanism, and the inside of the first threaded drill tube (1) is provided with a sampling mechanism. The transmission mechanism includes a first protective shell (101) disposed on the surfaces of the first threaded drill pipe (1) and the second threaded drill pipe (2) close to each other at one end. A second protective shell (102) is bolted to one side of the first protective shell (101). A bidirectional drive motor (103) is fixedly installed inside the second protective shell (102). A gear meshing plate (104) is fixedly installed at the output end of the bidirectional drive motor (103). A threaded transmission ring (105) that is threadedly connected to the first threaded drill pipe (1) and the second threaded drill pipe (2) is slidably connected inside the first protective shell (101). A transmission gear (106) that meshes with the gear meshing plate (104) is fixedly connected to the surface of the threaded transmission ring (105). The sampling mechanism includes a core container (201) disposed inside the first threaded drill pipe (1). A sealing cap (203) is threadedly connected to the top of the inner cavity of the core container (201). A baffle groove (202) is provided at the bottom of the core container (201). A second rotating rod (204) is rotatably connected inside the baffle groove (202). A sealing baffle (206) is fixedly connected to the surface of the second rotating rod (204). Torsion springs (205) fixedly connected to the second rotating rod (204) are fixedly connected to both sides of the sealing baffle (206). Sealing gaskets (207) are adhered to both sides of the sealing baffle (206). The bottom of the first threaded drill pipe (1) is welded with drilling teeth (17), the bottom of the inner cavity of the first threaded drill pipe (1) is welded with a diameter-limiting ring block (18), and the bottom of the inner cavity of the core container (201) is welded with a core clamp plate (16).

2. The high-sealing core pressure-maintaining sampler according to claim 1, characterized in that: The second protective shell (102) is fixedly installed with a protective net (5) that works in conjunction with the bidirectional drive motor (103) on the side away from the first protective shell (101). The top and bottom of the threaded transmission ring (105) are slidably connected with sliding pads (9) that are bonded to the first protective shell (101).

3. The high-sealing core pressure-maintaining sampler according to claim 1, characterized in that: The bottom surface of the first protective shell (101) is bolted with a connecting buckle (6), and the connecting buckle (6) is rotatably connected to a support leg (7). The end of the support leg (7) away from the connecting buckle (6) is welded with a support base plate (8).

4. The high-sealing core pressure-maintaining sampler according to claim 1, characterized in that: The top of the first threaded drill pipe (1), the second threaded drill pipe (2), and the third threaded drill pipe (3) are all connected to the inside of the threaded connector (4) with a positioning insertion hole (10), and a positioning rod (11) is inserted into the inside of the positioning insertion hole (10).

5. The high-sealing core pressure-maintaining sampler according to claim 1, characterized in that: The first protective shell (101) is rotatably connected to a first rotating rod (12), and the surface of the first rotating rod (12) is fixedly sleeved with a positioning wheel (13) that is slidably connected to the first threaded drill pipe (1), the second threaded drill pipe (2), and the third threaded drill pipe (3).

6. The high-sealing core pressure-maintaining sampler according to claim 1, characterized in that: The first threaded drill pipe (1) has a limit block (14) welded inside. The surface of the core container (201) is provided with a limit groove (15) that engages with the limit block (14). The surface of the core container (201) is also provided with a limit slide groove (19) that communicates with the limit groove (15).

7. The method of using a high-sealing core pressure-maintaining sampler according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1. Machine drilling: Align the threaded connectors (4) at the bottom of the second threaded drill pipe (2) and the third threaded drill pipe (3) with the tops of the first threaded drill pipe (1) and the second threaded drill pipe (2) respectively, and rotate them to make the first threaded drill pipe (1), the second threaded drill pipe (2) and the third threaded drill pipe (3) a whole. Then turn on the bidirectional drive motor (103) to drive the gear meshing plate (104) to rotate, so that the gear meshing plate (104) meshes with the transmission gear (106) and the threaded transmission ring (105) can rotate inside the first protective shell (101), thereby driving the first threaded drill pipe (1), the second threaded drill pipe (2) and the third threaded drill pipe (3) to rotate downward along the core hole pre-opened by the drilling machine. By continuously connecting new threaded drill pipes to the top of the third threaded drill pipe (3), the maximum drilling depth of the first threaded drill pipe (1) can be extended. Step 2. Core sampling: When the first threaded drill pipe (1) reaches the bottom of the core hole, the bidirectional drive motor (103) continues to drive the gear meshing plate (104) to rotate, so that the gear meshing plate (104) meshes with the transmission gear (106) and the threaded transmission ring (105) can rotate inside the first protective shell (101), thereby driving the first threaded drill pipe (1) to start drilling the core, so that the top of the core lifts the sealing baffle (206), so that the sealing baffle (206) opens and fits into the inside of the baffle groove (202), and the second rotating rod (204) drives the torsion spring (205) to twist, thereby drilling the core into the core container (201); Step 3. Core removal: By turning on the bidirectional drive motor (103) and rotating it in the opposite direction, the gear meshing plate (104) meshes with the transmission gear (106), and the threaded transmission ring (105) can rotate in the opposite direction inside the first protective shell (101), thereby driving the first threaded drill pipe (1) to move downward in the core hole. Then, the core is cut off by the core clamp plate (16), and the return force generated by the twisting of the torsion spring (205) drives the second rotating rod (204) to control the sealing baffle (206) to reset, sealing the bottom of the core container (201) and sealing the core inside the core container (201). Finally, the first threaded drill pipe (1) is driven back to the ground by the first protective shell (101), the first threaded drill pipe (1) is disassembled, and the core container (201) inside is taken out.

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