A soil sampling device for oil exploration

Abstract

The present invention relates to the field of geological exploration technology, and in particular to a soil sampling device for petroleum exploration, comprising a support frame, an outer rotating cylinder, a sampling core cylinder and a driving unit, wherein the outer wall of the outer rotating cylinder is provided with spiral blades, and a plurality of blocking blocks are hingedly installed at the opening at the bottom end of the outer rotating cylinder; the sampling core cylinder is coaxially arranged in the outer rotating cylinder, a threaded rod and a spline shaft are coaxially arranged on the top of the sampling core cylinder, a threaded sleeve block is arranged inside the outer rotating cylinder, and the threaded rod is spirally installed in the threaded sleeve block; a driving unit and a depth setting unit are arranged on the support frame, and a walking unit and a locking unit are arranged on the outer rotating cylinder. The technical scheme controls the moving distance of the outer rotating cylinder through the depth setting unit, and the blocking block at the bottom of the outer rotating cylinder blocks the bottom opening of the outer rotating cylinder, so that soil cannot enter the interior of the outer rotating cylinder and contact the sampling core cylinder, thereby preventing shallow soil from entering the interior of the outer rotating cylinder and contacting the sampling core cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of geological exploration, in particular to a soil sampling device for petroleum exploration. Background Art

[0002] In oil exploration, soil sampling plays an important role. By analyzing the organic matter content and mineral composition in soil samples, important information about reservoir characteristics, such as oil type and oil content, can be provided. At present, existing geological sampling equipment, such as soil sampling drills, is mostly used for shallow soil sampling. Drilling rig sampling is done by connecting multiple drill barrels in sequence, inserting the same number of coring inner tubes connected in sequence inside the drill barrels to take soil, thereby increasing the sampling depth. When sampling a deeper fixed-depth soil layer, the upper soil layer needs to be taken out before the soil layer of the predetermined depth can be sampled. The soil layers above the fixed-depth soil layer need to be taken out layer by layer, that is, after each drill barrel length is lowered, the coring inner tube needs to be pulled out completely, the soil sample needs to be taken out, and then the coring inner tube needs to be lowered. This process is relatively cumbersome and time-consuming. It is impossible to directly take out the soil sample of the fixed-depth soil layer, resulting in low soil sampling efficiency.

[0003] Chinese patent CN118168843A discloses a soil fixed-depth sampling device for geological exploration, including: a shell, a sampling mechanism, a transmission mechanism and a rotary drive device, the sampling mechanism includes a drill tube, a rotating shaft, a spiral blade, and a sampling core tube, the transmission mechanism includes a driving shaft, a transmission shaft, a first transmission assembly, a second transmission assembly, a third transmission assembly and a one-way transmission member, and the rotary drive device is connected to the driving shaft in a transmission manner.

[0004] The device can discharge the soil in the drill barrel upward to the ground by controlling the relative rotation of the spiral blade and the drill barrel. When the sampling core barrel descends to a predetermined depth, the soil sample in the sampling core barrel is the soil of the predetermined depth layer. However, when the device is working, the shallow soil will pass through the sampling core barrel, which is easy to produce residue and mix with the deep soil in the subsequent soil extrusion, affecting the accuracy of the soil monitoring data. Summary of the invention

[0005] In view of the above problems, it is necessary to provide a soil sampling device for oil exploration to address the existing technical problems.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0007] A soil sampling device for petroleum exploration comprises a support frame, an outer rotating cylinder, a sampling core cylinder and a driving unit. The outer rotating cylinder is rotatably mounted on the support frame to keep it vertical. The outer wall of the outer rotating cylinder is provided with spiral blades. A plurality of blocking blocks are hingedly mounted at the opening at the bottom end of the outer rotating cylinder. The sampling core cylinder is coaxially arranged in the outer rotating cylinder. The bottom opening of the sampling core cylinder is provided with saw teeth. An opening and closing cover plate is arranged on the periphery of the sampling core cylinder. A threaded rod and a spline shaft are coaxially arranged on the top of the sampling core cylinder. A threaded sleeve block is arranged inside the outer rotating cylinder. The threaded rod The spiral is installed in the threaded sleeve; a driving unit for driving the outer drum and the sampling core drum to rotate synchronously is arranged on the support frame; a traveling unit for driving the outer drum to move downward in the vertical direction is arranged on the outer drum; a depth-fixing unit for controlling the moving distance of the outer drum in the vertical direction is arranged on the support frame; a locking unit for locking the rotation of the outer drum is also arranged on the outer drum, and after the locking unit locks the outer drum, the traveling unit locks the position of the outer drum in the vertical direction, and the driving unit drives the sampling core drum to rotate and move downward.

[0008] Preferably, a rotating block is coaxially installed on the top of the outer rotating cylinder, and the spline shaft of the sampling core cylinder is inserted in the rotating block; a plurality of jacks are rotatably installed on the circumference of the rotating block, and an elastic sheet is provided on the side of each jack facing the axis of the rotating block, and a plurality of ratchet teeth are provided on the top of the outer rotating cylinder on the circumference of the rotating block, and the outer rotating cylinder drives the sampling core cylinder to rotate synchronously through the cooperation of the jacks and ratchets.

[0009] Preferably, a connecting seat is coaxially arranged on the top of the rotating block, and the driving unit includes a first bevel gear coaxially installed on the top of the connecting seat, and a second bevel gear meshing with the first bevel gear, the axis of the second bevel gear is horizontally arranged, and the second bevel gear is coaxially installed on the working end of the first rotating driver, the first rotating driver is fixedly installed on the moving seat, the moving seat is slidably installed on the support frame, the moving seat slides in the vertical direction, and the moving seat is fixedly connected to the top end of the outer rotating cylinder through a connecting piece.

[0010] Preferably, the ratchet teeth are respectively arranged on the slider, the slider is located on the side of the ratchet teeth away from the axis of the outer rotating cylinder, a ring surrounding the rotating block is arranged on the top of the outer rotating cylinder, and telescopic rods with the same number as the ratchet teeth are arranged in the ring, the axis of the telescopic rods extends along the radial direction of the outer rotating cylinder, the telescopic rods are connected to the slider, and a reset spring is sleeved on the telescopic rod, the reset spring elastically connects the inner wall of the ring and the slider, and the elastic force of the reset spring causes the slider to move to the side away from the axis of the outer rotating cylinder; a top sleeve is coaxially sleeved on the top end of the outer rotating cylinder, the upper side opening of the top sleeve fits the conical surface arranged on the bottom of the slider, and the conical surface gradually approaches the axis of the outer rotating cylinder downward, the top sleeve is fixedly mounted on the working end of the linear drive, the linear drive is fixedly mounted on the top end of the outer rotating cylinder, and the linear drive drives the top sleeve to move along the axis direction of the outer rotating cylinder.

[0011] Preferably, the walking unit includes a fixed sleeve coaxially installed on the outer rotating drum, the fixed sleeve is rotatably installed on the upper side of the spiral blade of the outer rotating drum, a horizontally extending extension plate is provided on one side of the fixed sleeve, the fixed sleeve is limitedly installed in a limiting guide groove provided on the support frame, and the limiting guide groove extends in the vertical direction; a second rotary driver is fixedly installed on the other side of the fixed sleeve, a driving gear is coaxially arranged on the working end of the second rotary driver, the axis of the driving gear is horizontally arranged, a vertical first rack is arranged on the support frame, and the driving gear is meshingly connected with the first rack.

[0012] Preferably, the limiting guide groove is provided with a waist-shaped hole passing through the limiting guide groove, and the waist-shaped hole extends along the length direction of the limiting guide groove; the depth fixing unit includes a sliding seat slidably mounted on the support frame, the sliding seat is provided with a locker for locking the position of the sliding seat on the support frame, and a horizontally extending positioning plate, the positioning plate extends into the limiting guide groove through the waist-shaped hole, and the positioning plate is located below the extension plate; the outer wall of the limiting guide groove is provided with scale markings, and a horizontal alignment pointer is fixedly mounted on the sliding seat, and the alignment pointer is arranged flush with the scale markings.

[0013] Preferably, the locking unit includes a mounting seat fixedly mounted on the extension plate, a first movable seat and a second movable seat are slidably mounted on the mounting seat, the first movable seat is located at an end of the extension plate away from the outer drum, the first movable seat and the second movable seat move in a vertical direction, a vertical second rack is provided on the side close to the first movable seat and the second movable seat, a central gear is rotatably mounted on the first movable seat, and the second racks on the first movable seat and the second movable seat are respectively meshed and connected to the two sides of the central gear; a limit ring is coaxially arranged on the outer drum, a plurality of positioning holes are arranged on the limit ring, the axes of the positioning holes are vertically arranged, and the positioning holes surround the limit ring The positioning rings are distributed at equal angles, the extension plate is provided with a first through hole which is in the same straight line as the positioning socket, the bottom of the second movable seat is provided with a mounting sleeve which is in the same straight line as the first through hole, the outer diameter of the mounting sleeve is the same as the diameter of the first through hole, a positioning rod and a telescopic spring are provided in the mounting sleeve, the telescopic spring elastically connects the mounting sleeve and the positioning rod, the diameter of the positioning rod is the same as the diameter of the positioning socket, the positioning rod is inserted into the positioning socket to lock the rotation of the outer rotating cylinder; an upper push rod extending vertically upward is provided on the positioning plate, the extension plate is provided with a second through hole which is in the same straight line as the upper push rod, and the second through hole is located below the first movable seat.

[0014] Preferably, a downward pressure spring is provided on the mounting seat, the downward pressure spring is located above the first movable seat and elastically connects the mounting seat and the first movable seat, and the elastic force of the downward pressure spring causes the first movable seat to move downward.

[0015] Preferably, a sensing unit is provided on the upper side of the positioning plate, and the sensing unit is used to detect the distance between the extension plate and the sensing unit. The sensing unit is connected to the first rotation driver and the second rotation driver through a controller signal.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Firstly, when the outer rotating cylinder in the present invention moves downward, the sealing block at the bottom of the outer rotating cylinder blocks the bottom opening of the outer rotating cylinder, so that the soil cannot enter the inner part of the outer rotating cylinder and contact the sampling core cylinder. The spiral blades outside the outer rotating cylinder push the soil outward, so as to prevent the shallow soil from entering the inner part of the outer rotating cylinder and contacting the sampling core cylinder, thereby ensuring the accuracy of the subsequent detection data.

[0018] Secondly, a rotating block is rotatably installed on the top of the outer rotating cylinder in the present invention. When the rotating block rotates, the spline shaft of the sampling core cylinder can be driven to rotate synchronously with the rotating block. The ratchet teeth arranged on the peripheral side of the rotating block of the outer rotating cylinder cooperate with the jack teeth on the rotating block to achieve that when the sampling core cylinder and the rotating block rotate in a certain direction, the jack teeth and the ratchet teeth are engaged to drive the outer rotating cylinder to rotate synchronously. When the sampling core cylinder and the rotating block rotate in the opposite direction, the outer rotating cylinder will not rotate synchronously with the rotating block, thereby enabling the outer rotating cylinder and the sampling core cylinder to achieve different states of synchronous rotation and relative rotation.

[0019] Thirdly, the support frame in the present invention is provided with a depth-fixing unit for controlling the moving distance of the outer drum, and the depth-fixing unit cooperates with the locking unit to realize locking of any position of the outer drum, so that the sampling core drum can be sampled at any designated position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a stereoscopic view of a soil sampling device for oil exploration in a first working state;

[0021] Figure 2 yes Figure 1 A local enlarged view of point A;

[0022] Figure 3 It is a side view of a soil sampling device for oil exploration in a first working state;

[0023] Figure 4 yes Figure 3 A cross-sectional view of the section at BB;

[0024] Figure 5 yes Figure 4 A partial enlarged view of point C;

[0025] Figure 6 yes Figure 4 A partial enlarged view of point D;

[0026] Figure 7 yes Figure 4 A local enlarged view of point E;

[0027] Figure 8 is a stereoscopic diagram of a soil sampling device for oil exploration in a second working state;

[0028] Fig. 9 yes Figure 8 A partial enlarged view of point F;

[0029] Fig.10 A three-dimensional structural analysis of a soil sampling device for oil exploration Figure 1 ;

[0030] Fig.11 A three-dimensional structural analysis of a soil sampling device for oil exploration Figure 2 ;

[0031] Fig.12 yes Fig.11 A partial enlarged view of point G.

[0032] The numbers in the figure are: 1, support frame; 11, limit guide groove; 111, waist-shaped hole; 112, scale mark; 12, first rack; 2, outer drum; 21, spiral blade; 22, blocking block; 23, threaded sleeve block; 24, rotating block; 241, jack gear; 242, elastic sheet; 243, connecting seat; 25, ratchet; 251, slider; 252, conical surface; 26, collar; 261, telescopic rod; 262, reset spring; 27, top sleeve; 271, linear drive; 28, limit ring; 281, positioning jack; 3, sampling core tube; 31, sawtooth; 32, opening and closing cover plate; 33, threaded rod; 34, spline shaft; 4, drive unit; 41, first bevel gear; 42, The second bevel gear; 43, the first rotary driver; 44, the moving seat; 441, the connecting piece; 5, the walking unit; 51, the fixing sleeve; 511, the extension plate; 512, the first through hole; 513, the second through hole; 52, the second rotary driver; 521, the driving gear; 6, the depth setting unit; 61, the sliding seat; 611, the locking device; 612, the alignment pointer; 62, the positioning plate; 621, the upper push rod; 622, the sensing unit; 7, the locking unit; 71, the mounting seat; 711, the first moving seat; 712, the second moving seat; 713, the second rack; 714, the central gear; 715, the mounting sleeve; 716, the positioning rod; 717, the telescopic spring; 718, the pressing spring. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Reference Figures 1 to 12 :

[0035] A soil sampling device for petroleum exploration comprises a support frame 1, an outer rotating cylinder 2, a sampling core cylinder 3 and a driving unit 4. The outer rotating cylinder 2 is rotatably mounted on the support frame 1 to keep it vertical. The outer wall of the outer rotating cylinder 2 is provided with a spiral blade 21. A plurality of blocking blocks 22 are hingedly mounted at the bottom opening of the outer rotating cylinder 2. The sampling core cylinder 3 is coaxially arranged in the outer rotating cylinder 2. A sawtooth 31 (such as a tooth) is provided at the bottom opening of the sampling core cylinder 3. Figure 7 As shown in FIG. 1 ), an opening and closing cover plate 32 is arranged around the sampling core cylinder 3, a threaded rod 33 and a spline shaft 34 are coaxially arranged on the top of the sampling core cylinder 3, and a threaded sleeve block 23 is arranged inside the outer rotating cylinder 2 (as shown in FIG. 1 ). Figure 5 As shown), the threaded rod 33 is spirally installed in the threaded sleeve block 23; a driving unit 4 for driving the outer drum 2 and the sampling core drum 3 to rotate synchronously is provided on the support frame 1; a walking unit 5 for driving the outer drum 2 to move downward in the vertical direction is provided on the outer drum 2; a depth-fixing unit 6 for controlling the moving distance of the outer drum 2 in the vertical direction is provided on the support frame 1; a locking unit 7 for locking the rotation of the outer drum 2 is also provided on the outer drum 2. After the locking unit 7 locks the outer drum 2, the walking unit 5 locks the position of the outer drum 2 in the vertical direction, and the driving unit 4 drives the sampling core drum 3 to rotate and move downward.

[0036] When the sampling device of the present invention is in use, the staff moves the support frame 1 to the sampling point, the driving unit 4 drives the outer drum 2 and the sampling core drum 3 to rotate synchronously, and the walking unit 5 drives the outer drum 2 and the sampling core drum 3 to move downward synchronously to perform the drilling operation. The sampling core drum 3 is located inside the outer drum 2. During the downward movement of the outer drum 2, the blocking block 22 at the bottom of the outer drum 2 blocks the bottom opening of the outer drum 2, so that the soil cannot enter the outer drum 2 and contact the sampling core drum 3. The spiral blades 21 outside the outer drum 2 push the soil outward to ensure the downward movement of the outer drum 2. A depth setting unit 6 is provided on the support frame 1. The depth setting unit 6 is used to control the downward movement depth of the outer drum 2, so that when the outer drum 2 and the sampling core drum 3 move down to a specified depth, the walking unit 5 can be closed to stop the outer drum 2 from continuing to move downward, and then the sampling core drum 3 can be separately The sampling core barrel 3 is moved downward to push open the sealing block 22 hinged on the bottom of the outer drum 2, and the sampling core barrel 3 contacts the soil and takes samples to ensure the accuracy of subsequent detection data. The sampling core barrel 3 in this embodiment is coaxially provided with a threaded rod 33 and a spline shaft 34, and the threaded rod 33 is spirally installed in the threaded sleeve block 23 set in the outer drum 2. Therefore, when the outer drum 2 rotates, the sampling core barrel 3 rotates with the outer drum 2. When the outer drum 2 stops moving, the locking unit 7 locks the outer drum 2 so that the outer drum 2 cannot rotate. The driving unit 4 continues to drive the sampling core barrel 3 to rotate, which makes the sampling core barrel 3 rotate in the threaded sleeve block 23, thereby realizing the downward movement of the sampling core barrel 3 relative to the outer drum 2 and inserting it into the soil to complete the sampling. The side of the sampling core barrel 3 is provided with an opening and closing cover plate 32, and the staff can obtain the soil in the sampling core barrel 3 for detection by opening the opening and closing cover plate 32.

[0037] In order to solve the problem of how the outer drum 2 and the sampling core drum 3 can maintain different states of synchronous rotation and relative rotation, the following features are specifically set:

[0038] A rotating block 24 is coaxially installed on the top of the outer rotating cylinder 2, and the spline shaft 34 of the sampling core cylinder 3 is inserted in the rotating block 24; a plurality of jack teeth 241 are rotatably installed on the peripheral side of the rotating block 24, and an elastic sheet 242 is provided on the side of each jack tooth 241 facing the axis of the rotating block 24. A plurality of ratchet teeth 25 are provided on the top of the outer rotating cylinder 2 and the peripheral side of the rotating block 24. The outer rotating cylinder 2 drives the sampling core cylinder 3 to rotate synchronously through the cooperation of the jack teeth 241 and the ratchet teeth 25.

[0039] The outer drum 2 of the present embodiment is rotatably installed with a rotating block 24 at the top. When the rotating block 24 rotates, it can drive the spline shaft 34 of the sampling core barrel 3 to rotate synchronously with the rotating block 24. The outer drum 2 is provided with a plurality of ratchet teeth 25 on the peripheral side of the rotating block 24. The jack teeth 241 on the rotating block 24 cooperate with the elastic sheet 242 to achieve that when the sampling core barrel 3 and the rotating block 24 rotate in a certain direction, the jack teeth 241 engage with the ratchet teeth 25 to drive the outer drum 2 to rotate synchronously. When the sampling core barrel 3 and the rotating block 24 rotate in the opposite direction, the outer drum 2 will not rotate synchronously with the rotating block 24, thereby achieving different rotation states of the outer drum 2 and the sampling core barrel 3.

[0040] In order to solve the problem of how to drive the rotating block 24 to rotate, the following features are specifically set:

[0041] A connecting seat 243 is coaxially arranged on the top of the rotating block 24, and the driving unit 4 includes a first bevel gear 41 coaxially installed on the top of the connecting seat 243, and a second bevel gear 42 meshingly connected to the first bevel gear 41, the axis of the second bevel gear 42 is horizontally arranged, and the second bevel gear 42 is coaxially installed on the working end of the first rotating driver 43, the first rotating driver 43 is fixedly installed on the moving seat 44, the moving seat 44 is slidably installed on the support frame 1, the moving seat 44 slides in the vertical direction, and the moving seat 44 is fixedly connected to the top of the outer drum 2 through the connecting piece 441.

[0042] The driving unit 4 in this embodiment is fixedly connected to the connecting seat 243 on the rotating block 24 through the first bevel gear 41. When the first rotating driver 43 is started, the second bevel gear 42 at the working end of the first rotating driver 43 drives the first bevel gear 41 and the rotating block 24 to rotate synchronously. The first rotating driver 43 can be a servo motor. The first rotating driver 43 is fixedly installed on the moving seat 44, and the moving seat 44 is fixedly connected to the top of the outer rotating drum 2 through the connecting piece 441. Therefore, when the outer rotating drum 2 moves downward, the moving seat 44 drives the first rotating driver 43 to move synchronously with the outer rotating drum 2 to ensure the stability of the meshing relationship between the first bevel gear 41 and the second bevel gear 42. The moving seat 44 is slidably installed on the support frame 1 to maintain the stability of its own moving path.

[0043] In order to solve the problem of how to make the sampling core cylinder 3 re-enter the outer drum 2 after sampling is completed, the following features are specifically set:

[0044] The ratchets 25 are respectively arranged on the sliders 251. The sliders 251 are located on the side of the ratchet 25 away from the axis of the outer drum 2. A collar 26 surrounding the rotating block 24 is arranged on the top of the outer drum 2. The collar 26 is provided with telescopic rods 261 having the same number as the ratchets 25. The axes of the telescopic rods 261 extend along the radial direction of the outer drum 2. The telescopic rods 261 are connected to the sliders 251. A reset spring 262 is sleeved on the telescopic rod 261. The reset spring 262 elastically connects the inner wall of the collar 26 and the slider 251. The elastic force of the reset spring 262 causes the slider 251 to move to the side away from the axis of the outer rotating cylinder 2; a top sleeve 27 is coaxially provided on the top end of the outer rotating cylinder 2, and the upper opening of the top sleeve 27 fits the conical surface 252 set at the bottom of the slider 251, and the conical surface 252 gradually approaches the axis of the outer rotating cylinder 2 downward, and the top sleeve 27 is fixedly mounted on the working end of the linear drive 271, and the linear drive 271 is fixedly mounted on the top end of the outer rotating cylinder 2, and the linear drive 271 drives the top sleeve 27 to move along the axis direction of the outer rotating cylinder 2.

[0045] The ratchet 25 in this embodiment restricts the jack teeth 241 on the rotating block 24, resulting in the rotating block 24 being able to rotate only in one direction. At this time, the rotation direction of the rotating block 24 can make the sampling core 3 move downward. When the sampling core 3 moves down to a certain depth to complete sampling, the rotating block 24 needs to rotate in the opposite direction to drive the sampling core 3 to move upward. On the slider 251 set by the ratchet 25 in this embodiment, the slider 251 drives the top sleeve 27 to move upward through the linear drive 271 to generate pressure on the conical surface 252 at the bottom of the slider 251, thereby pushing the slider 251 to move radially along the outer drum 2 and approach the axis of the outer drum 2. The slider 251 is connected to the sleeve The telescopic rod 261 in the ring 26 ensures the stability of its own moving path. When all the sliders 251 are spliced ​​together, the ratchet 25 can contact the jack 241 of the rotating block 24. When the driving unit 4 drives the rotating block 24 and the sampling core barrel 3 to rotate in the opposite direction, the linear drive 271 drives the top sleeve 27 to move downward. The slider 251 moves to the side away from the axis of the outer rotating cylinder 2 under the elastic force of the reset spring 262, so that the jack 241 of the rotating block 24 cannot contact the ratchet 25, thereby ensuring that the sampling core barrel 3 can rotate in the opposite direction to enter the inner part of the outer rotating cylinder 2. The linear drive 271 in this embodiment can be an electric push rod or a cylinder, etc.

[0046] In order to solve the problem of how the walking unit 5 drives the outer drum 2 to move in the vertical direction, the following features are specifically set:

[0047] The walking unit 5 includes a fixed sleeve 51 coaxially installed on the outer rotating drum 2, the fixed sleeve 51 is rotatably installed on the upper side of the spiral blade 21 of the outer rotating drum 2, a horizontally extending extension plate 511 is provided on one side of the fixed sleeve 51, the fixed sleeve 51 is limitedly installed in a limiting guide groove 11 provided on the support frame 1, and the limiting guide groove 11 extends in the vertical direction; a second rotary driver 52 is fixedly installed on the other side of the fixed sleeve 51, a driving gear 521 is coaxially arranged on the working end of the second rotary driver 52, the axis of the driving gear 521 is horizontally arranged, a vertical first rack 12 is arranged on the support frame 1, and the driving gear 521 is meshed and connected with the first rack 12.

[0048] The walking unit 5 in this embodiment is rotatably connected to the outer rotating drum 2 through the fixed sleeve 51, and the fixed sleeve 51 is limited in the limiting guide groove 11 of the support frame 1 by the extension plate 511, ensuring that the rotation of the outer rotating drum 2 will not cause the fixed sleeve 51 to rotate accordingly. The second rotation driver 52 arranged on one side of the fixed sleeve 51 drives the driving gear 521 to rotate, and the driving gear 521 is engaged with the vertical first rack 12 arranged on the support frame 1. Therefore, when the driving gear 521 rotates, it can drive the fixed sleeve 51 to move in the vertical direction. Similarly, after the second rotation driver 52 stops working, the driving gear 521 can maintain a height position on the first rack 12, thereby locking the position of the outer rotating drum 2. The second rotation driver 52 in this embodiment can be a servo motor.

[0049] In order to solve the problem of how to control the downward movement depth of the outer drum 2 so as to drive the sampling core drum 3 to reach the designated sampling position, the following features are specifically set:

[0050] The limiting guide groove 11 is provided with a waist-shaped hole 111 which passes through the limiting guide groove 11, and the waist-shaped hole 111 extends along the length direction of the limiting guide groove 11; the depth fixing unit 6 includes a sliding seat 61 slidably mounted on the support frame 1, and the sliding seat 61 is provided with a locker 611 for locking the position of the sliding seat 61 on the support frame 1, and a horizontally extending positioning plate 62, the positioning plate 62 passes through the waist-shaped hole 111 and extends into the limiting guide groove 11, and the positioning plate 62 is located below the extension plate 511; the outer wall of the limiting guide groove 11 is provided with a scale mark 112, and a horizontal alignment pointer 612 is fixedly mounted on the sliding seat 61, and the alignment pointer 612 is arranged flush with the scale mark 112.

[0051] The depth-fixing unit 6 in this embodiment includes a sliding seat 61 slidably mounted on the support frame 1. When the sliding seat 61 moves in the vertical direction, the positioning plate 62 arranged on the sliding seat 61 is located in the limiting guide groove 11 of the support frame 1 and moves. The sliding seat 61 can move vertically according to the scale mark 112 indicated by the alignment pointer 612. After the sliding seat 61 moves down to a suitable distance, the position of the sliding seat 61 on the support frame 1 is locked by the locking device 611. The locking device 611 in this embodiment can be any existing technology such as a locking bolt. After the position of the sliding seat 61 is fixed, the staff performs drilling sampling. When the walking unit 5 drives the outer rotating drum 2 to move downward, the fixed sleeve 51 follows the outer rotating drum 2 to move downward. When the second rotating driver 52 on the fixed sleeve 51 moves down to contact the positioning plate 62, it limits the movement of the outer rotating drum 2, so that the sampling core cylinder 3 can be stopped at any sampling position to ensure the accuracy of sampling.

[0052] In order to solve the problem of how to lock the outer drum 2 from rotating after the extension plate 511 and the positioning plate 62 are attached to each other, the following features are specifically provided:

[0053] The locking unit 7 includes a mounting seat 71 fixedly mounted on the extension plate 511, and a first movable seat 711 and a second movable seat 712 are slidably mounted on the mounting seat 71, the first movable seat 711 is located at an end of the extension plate 511 away from the outer drum 2, the first movable seat 711 and the second movable seat 712 move in the vertical direction, and a vertical second rack 713 is provided on the side where the first movable seat 711 and the second movable seat 712 are close to each other, and a central gear 714 is rotatably mounted on the first movable seat 711, and the second racks 713 on the first movable seat 711 and the second movable seat 712 are respectively meshed and connected to the two sides of the central gear 714; a limiting ring 28 is coaxially arranged on the outer drum 2, and a plurality of positioning sockets 281 are arranged on the limiting ring 28, the axis of the positioning socket 281 is vertically arranged, and the positioning socket 281 surrounds the limiting ring 28 at equal angles. The extension plate 511 is provided with a first through hole 512 which is in the same straight line as the positioning socket 281, and the bottom of the second movable seat 712 is provided with a mounting sleeve 715 which is in the same straight line as the first through hole 512. The outer diameter of the mounting sleeve 715 is the same as the diameter of the first through hole 512. A positioning rod 716 and a telescopic spring 717 are provided in the mounting sleeve 715. The telescopic spring 717 elastically connects the mounting sleeve 715 and the positioning rod 716. The diameter of the positioning rod 716 is the same as the diameter of the positioning socket 281. The positioning rod 716 is inserted into the positioning socket 281 to lock the rotation of the outer drum 2; the positioning plate 62 is provided with an upper push rod 621 which extends vertically upward, and the extension plate 511 is provided with a second through hole 513 which is in the same straight line as the upper push rod 621. The second through hole 513 is located below the first movable seat 711.

[0054] A downward pressing spring 718 is provided on the mounting seat 71 . The downward pressing spring 718 is located above the first movable seat 711 and elastically connects the mounting seat 71 and the first movable seat 711 . The elastic force of the downward pressing spring 718 causes the first movable seat 711 to move downward.

[0055] A sensing unit 622 is disposed on the upper side of the positioning plate 62 . The sensing unit 622 is used to detect the distance between the extension plate 511 and the sensing unit 622 . The sensing unit 622 is connected to the first rotation driver 43 and the second rotation driver 52 through a controller signal.

[0056] When the locking unit 712 is moved upward, the second rack 713 and the central gear 714 are driven by the locking cam 716 to move the locking cam 718 downward, so that the second locking cam 718 can be locked to the locking cam 718 by the locking cam 716. After the extension plate 511 is fitted with the positioning plate 62, the sensing unit 622 on the positioning plate 62 detects and sends a signal to the controller, and the controller can stop the second rotary driver 52 of the walking unit 5 from rotating, stop the outer drum 2 from moving downward, and can also drive the first rotary driver 43 of the driving unit 4 to rotate in the opposite direction, so as to realize the downward movement of the sampling core cylinder 3 relative to the outer drum 2 for sampling. After the sampling is completed, the sampling core cylinder 3 moves up and resets, and then the walking unit 5 drives the outer drum 2 to reset. During the resetting of the outer drum 2, the extension plate 511 moves up relative to the positioning plate 62, and the upper push rod 621 is separated from the second through hole 513 of the extension plate 511. At this time, the first moving seat 711 moves down under the elastic force of the downward pressure spring 718, driving the second moving seat 712 on the other side to move up, so that the positioning plug rod 716 is separated from the positioning plug hole 281 of the limit ring 28, and the restriction on the outer drum 2 is released.

[0057] Working principle: when in use, the staff moves the support frame 1 to the sampling point, the driving unit 4 drives the outer drum 2 and the sampling core drum 3 to rotate synchronously, and the walking unit 5 drives the outer drum 2 and the sampling core drum 3 to move downward synchronously to perform the drilling operation. The sampling core drum 3 is located outside the outer drum 2. During the downward movement of the outer drum 2, the blocking block 22 at the bottom of the outer drum 2 blocks the bottom opening of the outer drum 2, and the spiral blades 21 outside the outer drum 2 push the soil outward. The depth setting unit 6 controls the downward movement depth of the outer drum 2. When the outer drum 2 and the sampling core drum 3 move down to the specified depth, the walking unit 5 is closed to stop the outer drum 2 from continuing to move downward. Subsequently, the sampling core drum 3 moves downward alone, pushes away the blocking block 22 hinged at the bottom of the outer drum 2, and the sampling core drum 3 contacts the soil and takes samples. After the sampling is completed, the staff can obtain the soil in the sampling core drum 3 for testing by opening the opening and closing cover 32 on the side of the sampling core drum 3.

[0058] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A soil sampling device for oil exploration, comprising a support frame (1), an outer rotating drum (2), a sampling core drum (3) and a driving unit (4), characterized in that: The outer rotating drum (2) is rotatably mounted on the support frame (1) and maintained vertically, the outer wall of the outer rotating drum (2) is provided with spiral blades (21), and a plurality of blocking blocks (22) are hingedly mounted at the bottom opening of the outer rotating drum (2); The sampling core barrel (3) is coaxially arranged in the outer rotating barrel (2); a sawtooth (31) is arranged at the bottom opening of the sampling core barrel (3); an opening and closing cover plate (32) is arranged on the circumference of the sampling core barrel (3); a threaded rod (33) and a spline shaft (34) are coaxially arranged on the top of the sampling core barrel (3); a threaded sleeve (23) is arranged inside the outer rotating barrel (2); and the threaded rod (33) is spirally installed in the threaded sleeve (23); A driving unit (4) for driving the outer rotating cylinder (2) and the sampling core cylinder (3) to rotate synchronously is arranged on the support frame (1); The outer drum (2) is provided with a walking unit (5) for driving the outer drum (2) to move downward in a vertical direction; A depth-setting unit (6) for controlling the vertical movement distance of the outer rotating drum (2) is provided on the support frame (1); The outer rotating cylinder (2) is also provided with a locking unit (7) for locking the rotation of the outer rotating cylinder (2). After the locking unit (7) locks the outer rotating cylinder (2), the walking unit (5) locks the position of the outer rotating cylinder (2) in the vertical direction, and the driving unit (4) drives the sampling core cylinder (3) to rotate and move downward. A rotating block (24) is coaxially mounted on the top of the outer rotating cylinder (2), and a spline shaft (34) of the sampling core cylinder (3) is inserted into the rotating block (24); A plurality of jack teeth (241) are rotatably mounted on the circumference of the rotating block (24), and an elastic sheet (242) is arranged on the side of each jack tooth (241) facing the axis of the rotating block (24). A plurality of ratchet teeth (25) are arranged on the top of the outer rotating cylinder (2) and located on the circumference of the rotating block (24). The outer rotating cylinder (2) drives the sampling core cylinder (3) to rotate synchronously through the cooperation of the jack teeth (241) and the ratchet teeth (25); The ratchet teeth (25) are respectively arranged on the slider (251), and the slider (251) is located on a side of the ratchet teeth (25) away from the axis of the outer rotating cylinder (2). A collar (26) surrounding the rotating block (24) is arranged on the top of the outer rotating cylinder (2), and telescopic rods (261) of the same number as the ratchet teeth (25) are arranged in the collar (26). The axis of the telescopic rod (261) extends along the radial direction of the outer rotating cylinder (2), and the telescopic rod (261) is connected to the slider (251). A return spring (262) is sleeved on the telescopic rod (261), and the return spring (262) elastically connects the inner wall of the collar (26) and the slider (251). The elastic force of the return spring (262) causes the slider (251) to move to a side away from the axis of the outer rotating cylinder (2). A top sleeve (27) is coaxially mounted on the top of the outer rotating cylinder (2). An upper opening of the top sleeve (27) fits a conical surface (252) disposed at the bottom of the slider (251). The conical surface (252) gradually approaches the axis of the outer rotating cylinder (2) downward. The top sleeve (27) is fixedly mounted on a working end of a linear drive (271). The linear drive (271) is fixedly mounted on the top of the outer rotating cylinder (2). The linear drive (271) drives the top sleeve (27) to move along the axis of the outer rotating cylinder (2). The walking unit (5) comprises a fixed sleeve (51) coaxially mounted on the outer rotating drum (2), the fixed sleeve (51) being rotatably mounted on the upper side of the spiral blade (21) of the outer rotating drum (2), a horizontally extending extension plate (511) being provided on one side of the fixed sleeve (51), the fixed sleeve (51) being position-limitedly mounted in a position-limiting guide groove (11) provided on the support frame (1), and the position-limiting guide groove (11) extending in the vertical direction; A second rotary driver (52) is fixedly mounted on the other side of the fixed sleeve (51); a driving gear (521) is coaxially arranged on the working end of the second rotary driver (52); the axis of the driving gear (521) is arranged horizontally; a vertical first rack (12) is arranged on the support frame (1); and the driving gear (521) is meshingly connected with the first rack (12).

2. A soil sampling device for oil exploration according to claim 1, characterized in that: A connecting seat (243) is coaxially arranged on the top of the rotating block (24), and the driving unit (4) comprises a first bevel gear (41) coaxially mounted on the top of the connecting seat (243), and a second bevel gear (42) meshingly connected to the first bevel gear (41), the axis of the second bevel gear (42) being arranged horizontally, and the second bevel gear (42) being coaxially mounted on the working end of the first rotating driver (43), the first rotating driver (43) being fixedly mounted on the moving seat (44), the moving seat (44) being slidably mounted on the supporting frame (1), the moving seat (44) sliding in the vertical direction, and the moving seat (44) being fixedly connected to the top of the outer rotating drum (2) via a connecting piece (441).

3. A soil sampling device for oil exploration according to claim 1, characterized in that: The limiting guide groove (11) is provided with a waist-shaped hole (111) penetrating the limiting guide groove (11), and the waist-shaped hole (111) extends along the length direction of the limiting guide groove (11); The depth-fixing unit (6) comprises a sliding seat (61) slidably mounted on the support frame (1), the sliding seat (61) being provided with a locker (611) for locking the position of the sliding seat (61) on the support frame (1), and a horizontally extending positioning plate (62), the positioning plate (62) extending through the waist-shaped hole (111) into the limiting guide groove (11), and the positioning plate (62) being located below the extension plate (511); The outer wall of the position limiting guide groove (11) is provided with a scale mark (112), and a horizontal alignment pointer (612) is fixedly mounted on the sliding seat (61), and the alignment pointer (612) is arranged flush with the scale mark (112).

4. A soil sampling device for oil exploration according to claim 3, characterized in that: The locking unit (7) comprises a mounting seat (71) fixedly mounted on the extension plate (511), a first movable seat (711) and a second movable seat (712) being slidably mounted on the mounting seat (71), the first movable seat (711) being located at an end of the extension plate (511) away from the outer drum (2), the first movable seat (711) and the second movable seat (712) moving in a vertical direction, a vertical second rack (713) being provided on a side where the first movable seat (711) and the second movable seat (712) are close to each other, a central gear (714) being rotatably mounted on the first movable seat (711), and the second racks (713) on the first movable seat (711) and the second movable seat (712) respectively meshingly connected to two sides of the central gear (714); A limiting ring (28) is coaxially arranged on the outer rotating cylinder (2), and a plurality of positioning holes (281) are arranged on the limiting ring (28), the axis of the positioning holes (281) is arranged vertically, and the positioning holes (281) are distributed at equal angles around the limiting ring (28), and a first through hole (512) is arranged on the extension plate (511) and is in the same straight line as the positioning holes (281), and a bottom of the second movable seat (712) is provided with a plurality of positioning holes (281) and is in the same straight line as the first through hole (512). The outer diameter of the mounting sleeve (715) is the same as the diameter of the first through hole (512); a positioning rod (716) and a telescopic spring (717) are arranged in the mounting sleeve (715); the telescopic spring (717) elastically connects the mounting sleeve (715) and the positioning rod (716); the diameter of the positioning rod (716) is the same as the diameter of the positioning hole (281); the positioning rod (716) is inserted into the positioning hole (281) to lock the rotation of the outer rotating drum (2); The positioning plate (62) is provided with an upper push rod (621) extending vertically upwards, and the extension plate (511) is provided with a second through hole (513) which is in the same straight line as the upper push rod (621), and the second through hole (513) is located below the first movable seat (711).

5. A soil sampling device for oil exploration according to claim 4, characterized in that: The mounting seat (71) is provided with a downward pressure spring (718), which is located above the first movable seat (711) and elastically connects the mounting seat (71) and the first movable seat (711), and the elastic force of the downward pressure spring (718) causes the first movable seat (711) to move downward.

6. A soil sampling device for oil exploration according to claim 4, characterized in that: A sensing unit (622) is provided on the upper side of the positioning plate (62), and the sensing unit (622) is used to detect the distance between the extension plate (511) and the sensing unit (622). The sensing unit (622) is connected to the first rotation driver (43) and the second rotation driver (52) via a controller signal.

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