A mold for making a borehole sample

Abstract

The application discloses a drilling sample manufacturing mold, which is characterized by rotating a pivot part to drive an arc-shaped inner plate to move along a radial direction by an inner plate driving mechanism, thereby adjusting the distance between an inner tube and an outer tube, that is, adjusting the radius between the axis of a center tube and the inner tube, so as to adjust the aperture of the drilling. The drilling sample manufacturing mold disclosed by the application can manufacture drilling samples with different apertures by using the same mold, guarantees the diversity of the manufactured samples, saves materials, and improves the test efficiency.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering physical model testing technology, and in particular to a mold for making borehole specimens. Background Technology

[0002] During underground resource extraction, boreholes in rock formations may experience borehole wall collapse due to the redistribution of geostress, leading to well instability and even large-scale collapse. Therefore, experiments using hollow cylindrical specimens related to borehole collapse can provide a more in-depth understanding of this phenomenon.

[0003] There are many experiments currently being studied on pore wall collapse, among which the efficient fabrication of hollow cylindrical specimens has always been a technical challenge. The main reason is that the traditional fabrication of hollow cylindrical specimens requires changing different molds to alter the diameter of the central hole in the specimen. This method not only wastes mold material but also reduces the efficiency of specimen preparation. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a drilling sample manufacturing mold that can change the borehole diameter as needed.

[0005] The present invention provides a drilling sample preparation mold, comprising an outer tube, an inner tube, a central tube, and a pivot component arranged sequentially from the outside to the inside; The lower part of the outer tube is fixedly installed with a lower cover, and the upper part of the outer tube is detachably installed with an upper cover. The lower cover has a lower cover center hole, and the upper cover has an upper cover center hole. The lower end of the central tube is fixedly connected to the lower cover of the outer tube, and the upper end of the central tube is provided with an upper cover, which protrudes through the central hole of the upper cover. The pivot member passes through the central hole of the lower cover and is pivotally mounted in the central tube. The pivot member is detachably connected to the lower cover of the outer tube by fasteners. The inner tube is slidably mounted between the lower cover of the outer tube and the upper cover of the outer tube. The inner tube includes multiple arc-shaped inner plates that can be joined and separated from each other and multiple arc-shaped outer plates that can be joined and separated from each other. The central angles of the arc-shaped outer plates and the arc-shaped inner plates are equal. Each arc-shaped outer plate is slidably mounted on the outside of two adjacent arc-shaped inner plates. Each of the arc-shaped inner plates is connected to at least one set of inner plate driving mechanisms for driving the arc-shaped inner plate to slide radially. Each set of inner plate driving mechanisms passes through the through hole in the wall of the central tube and is connected to the pivot member. It can be synchronously driven by the pivot member to drive the arc-shaped inner plate to slide radially, thereby adjusting the diameter of the inner tube.

[0006] In one alternative technical solution, multiple sets of inner plate drive mechanisms are connected at intervals along the axial direction to the inner side of each of the arcuate inner plates.

[0007] In one of the optional technical solutions, the outer surface of the arc-shaped inner plate is provided with radially outwardly extending inner plate limiting claws at both ends, and the inner surface of the arc-shaped outer plate is provided with radially inwardly extending outer plate limiting claws at both ends, and each outer plate limiting claw is slidably located between two inner plate limiting claws of one arc-shaped inner plate. When the diameter of the inner tube is at its minimum, each outer plate limiting claw of each arc-shaped outer plate is located in the middle position of the two inner plate limiting claws of an arc-shaped inner plate; When the diameter of the inner tube is at its maximum value, each outer plate limiting claw of each arc-shaped outer plate contacts and limits the contact with one inner plate limiting claw of one arc-shaped inner plate.

[0008] In one of the alternative technical solutions, the outer tube lower cover has a plurality of lower cover connection holes evenly distributed around the central hole of the lower cover at intervals; The lower end of the pivot is provided with a polygonal end cap, which is located below the lower cover of the outer tube. The polygonal end cap is provided with at least two end cap connection holes for installing the fastener. The distance between the center of the end cap connection hole and the axis of the center hole of the lower cover is equal to the distance between the center of the lower cover connection hole and the axis of the center hole of the lower cover. Each of the fasteners passes through the end cap connection hole and may be selectively connected to one of the lower cap connection holes.

[0009] In one of the alternative technical solutions, the outer tube is formed by joining two semi-circular tubes together.

[0010] In one of the alternative technical solutions, the inner plate driving mechanism includes a first guide sleeve connected to the outside of the through hole in the pipe wall, a first slider slidably connected to the first guide sleeve, a first elastic element connected between the first guide sleeve and the first slider, and a flexible zipper connected to the first slider. One end of the first slider is fixedly connected to the arc-shaped inner plate, and the first elastic element is used to press against the first slider to drive the arc-shaped inner plate to slide outward radially; The flexible zipper passes through the through hole in the pipe wall and is wrapped around the pivot. When the pivot rotates in the forward direction, the flexible zipper pulls the first slider and causes the arc-shaped inner plate to slide radially inward.

[0011] In one of the alternative technical solutions, the pivot element is a screw; The inner plate driving mechanism includes a second guide sleeve connected to the outside of the through hole in the pipe wall, a second slider slidably connected to the second guide sleeve, a second elastic element connected between the second guide sleeve and the second slider, and a pressure block sleeved on the screw and threadedly connected to the screw. One end of the second slider is fixedly connected to the arc-shaped inner plate. One end of the second slider has a slider slope extending inward and downward. The end of the second slider with the slider slope can enter the central tube through the tube wall through hole. The second elastic element is used to pull the second slider to pull the arc-shaped inner plate to slide radially inward; The pressure block includes a cylindrical part and a tapered part connected to the bottom of the cylindrical part, and a guide structure is provided between the central tube and the cylindrical part to guide the pressure block to slide up and down; When the screw rotates in the forward direction, the pressure block slides downward on the screw and presses the inclined surface of the slider through the tapered portion, thereby pushing the second slider and the arc-shaped inner plate to slide outward radially.

[0012] In one of the alternative technical solutions, the guide structure includes a guide rail provided on the circumferential surface of the column portion and extending axially, and a guide groove provided on the inner surface of the central tube and extending axially. The guide rail is slidably fitted into the guide groove.

[0013] In one of the alternative technical solutions, a limiting block is provided at the bottom of the slider inclined surface facing the screw, and a limiting groove is provided on the bottom side of the tube wall through hole facing the screw; When the inner tube diameter is at its maximum value, the limiting block engages in the limiting groove.

[0014] In one of the alternative technical solutions, a limiting ring is provided on the screw below each of the pressure blocks; When the inner tube diameter is at its maximum value, the lower end of the tapered portion presses against the limiting ring.

[0015] The above technical solution has the following beneficial effects: The drilling sample preparation mold provided by this invention adjusts the distance between the inner and outer tubes by rotating a pivot member, thereby adjusting the radius between the axis of the central tube and the inner tube, and thus adjusting the borehole diameter. Specifically, when the pivot member rotates in the first direction, the inner plate driving mechanism drives the arc-shaped inner plate to move radially outward, thereby opening the arc-shaped outer plate. The arc-shaped outer plate moves towards the outer tube side at the same time. At this time, each arc-shaped outer plate is connected between two adjacent arc-shaped inner plates to form the wall of the inner tube. During this operation, the distance between the inner and outer tubes is reduced, the radius between the axis of the central tube and the inner tube is increased, and the borehole diameter is increased. When the pivot rotates in a second direction opposite to the first direction, the inner plate drive mechanism drives the arc-shaped inner plate to move radially inward. The two adjacent arc-shaped inner plates can eventually connect, and the arc-shaped outer plate is stacked on the outside of the two adjacent arc-shaped inner plates to form the wall of the inner tube. During this operation, the distance between the inner tube and the outer tube is increased, the radius between the axis of the central tube and the inner tube is reduced, and the diameter of the drilled hole is reduced.

[0016] The drilling specimen preparation mold provided by this invention enables the preparation of drilling specimens with different hole diameters using the same tool, ensuring the diversity of specimens that can be prepared, saving materials, and improving testing efficiency. Attached Figure Description

[0017] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings: Figure 1 A perspective view of a drilling sample fabrication mold provided in an embodiment of the present invention; Figure 2 A cross-sectional view of a drilling sample preparation mold provided in an embodiment of the present invention; Figure 3 This is a top view of the inner tube when its diameter is at its minimum. Figure 4 This is a schematic diagram showing the fit between two arc-shaped outer plates and one arc-shaped inner plate when the inner tube is at its minimum diameter. Figure 5 This is a schematic diagram showing the fit between two arc-shaped outer plates and one arc-shaped inner plate when the inner tube is at its maximum diameter. Figure 6 A three-dimensional view of a semi-circular tube; Figure 7 This is a top view of the polygonal end cap; Figure 8 This is a top view of the lower cover of the outer tube; Figure 9A radial sectional view of the assembled inner tube, the inner plate drive mechanism of the first structure, the central tube, and the pivot. Figure 10 This is a sectional view along the axial direction of the assembled inner tube, the inner plate drive mechanism of the first structure, the central tube, and the pivot when the inner tube diameter is at its maximum value. Figure 11 This is a sectional view along the axial direction of the assembled inner tube, the inner plate drive mechanism of the first structure, the central tube, and the pivot component when the diameter of the inner tube is reduced. Figure 12 A sectional view along the axial direction of the assembled inner tube, the inner plate drive mechanism of the second structure, the central tube, and the pivot. Figure 13 A radial sectional view of the assembled inner tube, the inner plate drive mechanism of the second structure, the central tube, and the pivot. Figure 14 This is a sectional view along the axial direction of the assembled inner tube, the inner plate drive mechanism of the second structure, the central tube, and the pivot when the inner tube diameter is at its minimum. Figure 15 This is a sectional view along the axial direction of the assembled inner tube, the inner plate drive mechanism of the second structure, the central tube, and the pivot when the inner tube diameter is at its maximum value. Figure 16 A schematic diagram showing the pressure block being assembled onto the screw, with the lower end of its tapered portion pressing against the limiting ring; Figure 17 This is a cross-sectional view of the pressure block along the radial direction of the column section; Figure 18 This is a cross-sectional view of the central tube along the radial direction; Figure 19 This is an enlarged view of the second slider with its inclined end extending into the central tube. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] like Figure 1-5 As shown in Figures 9-16, a drilling sample preparation mold provided in one embodiment of the present invention includes an outer tube 1, an inner tube 2, a central tube 3, and a pivot member 4 arranged sequentially from the outside to the inside.

[0020] The lower part of the outer tube 1 is fixedly installed with a lower cover 12, and the upper part of the outer tube 1 is detachably installed with an upper cover 13. The lower cover 12 is provided with a lower cover center hole 121, and the upper cover 13 is provided with an upper cover center hole 131.

[0021] The lower end of the central tube 3 is fixedly connected to the lower cover 12 of the outer tube, and the upper end of the central tube 3 is provided with an upper cover 31, which extends through the central hole 131 of the upper cover.

[0022] The pivot 4 passes through the central hole 121 of the lower cover and can be pivotally mounted in the central tube 3. The pivot 4 and the lower cover 12 of the outer tube are detachably connected by fasteners 6.

[0023] The inner tube 2 is slidably mounted between the lower cover 12 and the upper cover 13 of the outer tube. The inner tube 2 includes multiple arc-shaped inner plates 21 that can be joined and separated from each other and multiple arc-shaped outer plates 22 that can be joined and separated from each other. The central angles of the arc-shaped outer plates 22 and the arc-shaped inner plates 21 are equal. Each arc-shaped outer plate 22 is slidably mounted on the outside of two adjacent arc-shaped inner plates 21.

[0024] Each arc-shaped inner plate 21 is connected to at least one set of inner plate driving mechanisms 5 for driving the arc-shaped inner plate 21 to slide radially. Each set of inner plate driving mechanisms 5 passes through the pipe wall through hole 32 of the central tube 3 and is connected to the pivot 4. It can be synchronously driven by the pivot 4 to drive the arc-shaped inner plate 21 to slide radially, thereby adjusting the pipe diameter of the inner tube 2.

[0025] The present invention provides a drilling sample preparation mold for preparing drilling samples by grouting. The drilling sample preparation mold includes an outer tube 1, an inner tube 2, a central tube 3, a pivot 4, an inner plate drive mechanism 5, and fasteners 6, etc.

[0026] The outer tube 1, inner tube 2, central tube 3, and pivot 4 are arranged coaxially and are all metal parts. The central tube 3 is fitted onto the pivot 4, and the pivot 4 can rotate within the central tube 3. The inner tube 2 is fitted onto the outside of the central tube 3, and the outer tube 1 is fitted onto the outside of the inner tube 2.

[0027] A lower cover 12 is fixedly installed on the lower part of the outer tube 1. Specifically, a slot can be opened at the lower end of the outer tube 1, and the lower cover 12 is snapped into the slot. The lower cover 12 has a central hole 121 for the pivot 4 to pass through. An upper cover 13 is detachably installed on the upper part of the outer tube 1. Specifically, an internal thread can be provided on the inner surface of the upper end of the outer tube 1, and an internal thread is provided on the circumferential surface of the upper cover 13. The upper cover 13 is threaded into the upper end of the outer tube 1 and can be adjusted up and down to compress the concrete filled in the inner tube 2 and the outer tube 1. The lower cover 12 has a central hole 121 for the upper end of the central tube 3 to pass through.

[0028] The lower end of the central tube 3 is fixedly connected to the lower cover 12 of the outer tube, either by thread or by welding. An upper cover 31 is provided at the lower end of the central tube 3 to cover it and prevent concrete slurry from entering. The upper end of the pivot 4 is connected to the upper cover 31 via a bearing. The lower end of the pivot 4 extends out of the central hole 121 of the lower cover, and a bearing is fitted between the pivot 4 and the central hole 121 of the lower cover. The lower end of the pivot 4 is connected to the lower cover 12 of the outer tube via several fasteners 6. The fasteners 6 can be screws, bolts, clips, etc. After removing the fasteners 6, the pivot 4 can be rotated. The pivot 4 can be a shaft, bolt, screw, etc., that can rotate within the central tube 3.

[0029] The inner tube 2 has a variable diameter and is slidably mounted between the lower cover 12 and the upper cover 13 of the outer tube. The inner tube consists of an inner wall and an outer wall. Its inner wall includes multiple interlocking and separable arc-shaped inner plates 21, and its outer wall includes multiple interlocking and separable arc-shaped outer plates 22. The central angles of the arc-shaped outer plates 22 and the arc-shaped inner plates 21 are equal, and their number is also equal. Each arc-shaped outer plate 22 is slidably connected to two adjacent arc-shaped inner plates 21, and each arc-shaped outer plate 22 is installed on the outer side of two arc-shaped inner plates 21. If necessary, an arc-shaped guide rail structure can be configured between the arc-shaped outer plates 22 and the arc-shaped inner plates 21 to guide their relative sliding. If necessary, outward-facing flanges can also be provided on the upper and lower edges of the outer surface of the arc-shaped inner plates 21, with the arc-shaped outer plates 22 positioned between the upper and lower flanges.

[0030] When the diameter of the inner tube 2 is at its minimum, the two ends of two adjacent arc-shaped inner plates 21 are connected, and the two ends of two adjacent arc-shaped outer plates 22 are connected. The two ends of the arc-shaped outer plates 22 are located in the middle of the two adjacent arc-shaped inner plates 21. At this time, the arc-shaped outer plates 22 and the arc-shaped inner plates 21 are completely overlapped to form the wall of the inner tube 2.

[0031] When the diameter of the inner tube 2 is at its maximum value, the two adjacent arc-shaped inner plates 21 are separated to their maximum angle, and the two adjacent arc-shaped outer plates 22 are separated to their maximum angle, with the two ends of the arc-shaped outer plates 22 located at the two ends of the adjacent arc-shaped inner plates 21. At this time, the arc-shaped outer plates 22 and the arc-shaped inner plates 21 are fully extended and together form the wall of the inner tube 2.

[0032] If the arc-shaped inner plate 21 is pushed outward along the radial direction, the two adjacent arc-shaped inner plates 21 will separate, and then the two adjacent arc-shaped outer plates 22 will separate, thereby reducing the distance between the outer tube 1 and the inner tube 2 and increasing the radius between the axis of the inner tube 2 and the central tube 3, which is to say, increasing the radius of the drilled sample.

[0033] If the arc-shaped inner plate 21 is pushed inward along the radial direction, the two adjacent arc-shaped inner plates 21 that are in a separated state will shrink and move closer together, thereby causing the two adjacent arc-shaped outer plates 22 that are in a separated state to shrink and move closer together, thereby increasing the distance between the outer tube 1 and the inner tube 2 and reducing the radius between the axis of the inner tube 2 and the central tube 3, which is to say, reducing the radius of the drilled sample.

[0034] The inner plate drive mechanism 5 is used to drive the arc-shaped inner plate 21 to slide outward and inward radially. The inner plate drive mechanism 5 can adopt a telescopic arm structure, which can be driven by the rotating pivot 4, thereby driving the arc-shaped inner plate 21 to slide.

[0035] Each arc-shaped inner plate 21 has at least one inner plate drive mechanism 5 connected to its inner side. The central tube 3 has a tube wall through hole 32 corresponding to the position of each inner plate drive mechanism 5, for the inner plate drive mechanism 5 to pass through and connect with the pivot member 4.

[0036] When the pivot 4 rotates, it can drive all the inner plate drive mechanisms 5 to move synchronously, thereby driving all the arc-shaped inner plates 21 to adjust synchronously.

[0037] Assuming that when pivot 4 rotates in the forward direction, pivot 4 and / or its accessories drive the telescopic arm of the inner plate drive mechanism 5 to extend, driving the arc-shaped inner plate 21 to slide radially outward for adjustment; then when pivot 4 rotates in the reverse direction, pivot 4 and / or its accessories drive the telescopic arm of the inner plate drive mechanism 5 to retract, causing the arc-shaped inner plate 21 to slide radially inward for adjustment. The reverse is also true.

[0038] When using the drilling sample preparation mold to prepare the drilling sample, place the drilling sample preparation mold on the fixed fixture, remove the outer tube cover 13, and first apply a layer of mineral oil or other release agent that does not react with concrete to the inner surface of the outer tube 1, the outer surface of the inner tube 2, the top surface of the outer tube cover 13 and the bottom surface of the outer tube cover 13 to facilitate demolding after sample preparation.

[0039] Remove fastener 6. Adjust the diameter of the inner tube 2 by turning the lower end of the pivot 4 according to the required drilling size until it meets the requirements. Then, fix the pivot 4 with fastener 6 to keep the diameter of the inner tube 2 at the specified size and prevent it from changing size automatically. Then, inject concrete grout into the space between the inner tube 2 and the outer tube 1. Then, cover the outer tube with the top cover 13 and press it tightly. Place the mold vertically and let it stand for a period of time until the sample is formed before demolding.

[0040] When dismantling the mold, remove the upper outer tube cover 13, and then use a clamp or similar tool to invert the mold for making the drilled sample, so that the drilled sample can be poured out.

[0041] The radius of the upper cover 31 is less than or equal to the minimum radius of the inner tube 2, so as not to affect demolding.

[0042] In summary, the drilling sample preparation mold provided by this invention adjusts the distance between the inner tube 2 and the outer tube 1 by rotating the pivot 4, thereby adjusting the radius between the axis of the central tube 3 and the inner tube 2, and thus adjusting the borehole diameter. Specifically, when the pivot 4 rotates in the first direction, the inner plate driving mechanism 5 drives the arc-shaped inner plate 21 to move radially outward, thereby opening the arc-shaped outer plate 22. The arc-shaped outer plate 22 moves towards the outer tube 1 at the same time. At this time, each arc-shaped outer plate 22 is connected between two adjacent arc-shaped inner plates 21 to form the wall of the inner tube 2. During this operation, the distance between the inner tube 2 and the outer tube 1 is reduced, the radius between the axis of the central tube 3 and the inner tube 2 is increased, and the borehole diameter is increased. When the pivot 4 rotates in the second direction opposite to the first direction, the inner plate drive mechanism 5 drives the arc-shaped inner plate 21 to move radially inward. The two adjacent arc-shaped inner plates 21 can eventually connect. The arc-shaped outer plate 22 is stacked on the outside of the two adjacent arc-shaped inner plates 21 to form the wall of the inner tube 2. During this operation, the distance between the inner tube 2 and the outer tube 1 is increased, the radius between the axis of the central tube 3 and the inner tube 2 is reduced, and the diameter of the drilled hole is reduced.

[0043] The drilling specimen preparation mold provided by this invention enables the preparation of drilling specimens with different hole diameters using the same tool, ensuring the diversity of specimens that can be prepared, saving materials, and improving testing efficiency.

[0044] In one embodiment, such as Figure 2 As shown, along the axial direction, multiple sets of inner plate drive mechanisms 5 are connected at intervals to the inner side of each arc-shaped inner plate 21 to drive each arc-shaped inner plate 21 to move smoothly in the axial direction.

[0045] In one embodiment, such as Figure 4-5 As shown, the outer surfaces of the arc-shaped inner plate 21 are respectively provided with radially outward extending inner plate limiting claws 211 at both ends, and the inner surfaces of the arc-shaped outer plate 22 are respectively provided with radially inward extending outer plate limiting claws 221 at both ends. Each outer plate limiting claw 221 is slidably positioned between the two inner plate limiting claws 211 of an arc-shaped inner plate 21.

[0046] When the diameter of the inner tube 2 is at its minimum, each outer plate limiting claw 221 of each arc-shaped outer plate 22 is located in the middle position of the two inner plate limiting claws 211 of an arc-shaped inner plate 21.

[0047] When the diameter of the inner tube 2 is at its maximum value, each outer plate limiting claw 221 of each arc-shaped outer plate 22 contacts and limits the inner plate limiting claw 211 of an arc-shaped inner plate 21.

[0048] In this embodiment, by setting the inner plate limiting claw 211 and the outer plate limiting claw 221, the inner tube 2 can be limited when its diameter changes to the limit value.

[0049] When the diameter of the inner tube 2 is at its minimum, the two outer plate limiting claws 221 of the two adjacent arc-shaped outer plates 22 contact each other and are located in the middle of the inner arc-shaped inner plate 21. At the same time, the two inner plate limiting claws 211 of the two adjacent arc-shaped inner plates 21 contact each other and play a limiting role.

[0050] When the diameter of the inner tube 2 is at its maximum value, the outer plate limiting claws 221 at both ends of the arc-shaped outer plate 22 hook and limit one of the inner plate limiting claws 211 of the two adjacent arc-shaped inner plates 21.

[0051] In one embodiment, such as Figure 7-8 As shown, the lower cover 12 of the outer tube has a plurality of lower cover connection holes 122 evenly distributed around the central hole 121 of the lower cover.

[0052] The lower end of the pivot 4 is provided with a polygonal end cap 41, which is located below the lower cover 12 of the outer tube. The polygonal end cap 41 is provided with at least two end cap connecting holes 411 for installing fasteners 6. The distance between the center of the end cap connecting hole 411 and the axis of the lower cover center hole 121 is equal to the distance between the center of the lower cover connecting hole 122 and the axis of the lower cover center hole 121.

[0053] Each fastener 6 passes through the end cap connection hole 411 and can optionally be connected in one of the lower cover connection holes 122.

[0054] In this embodiment, a polygonal end cap 41 is provided at the lower end of the pivot 4 to facilitate the rotation of the pivot 4 by wrenches or power tools. To facilitate the connection and fixation of the fixing member 6, multiple annularly arranged lower cover connecting holes 122 are provided on the lower cover 12 of the outer tube. These holes are spaced apart and evenly distributed around the central hole 121 of the lower cover. The distance between the center of each lower cover connecting hole 122 and the axis of the central hole 121 is R. The lower cover connecting holes 122 are internally threaded holes. The number of lower cover connecting holes 122 should exceed 10; the denser the better.

[0055] Correspondingly, at least two end cap connecting holes 411 are provided on the polygonal end cap 41, and the distance between the center of the end cap connecting hole 411 and the axis of the lower cover center hole 121 is also R.

[0056] After rotating the pivot 4, the end cap connection hole 411 will be basically aligned with a lower cover connection hole 122, and then the fastener 6 will pass through the end cap connection hole 411 and be connected to the lower cover connection hole 122.

[0057] Of course, if necessary, a clamp can be used to connect the polygonal end cap 41 to the lower cover 12 of the outer tube. An electric gripper can also be installed at the bottom of the lower cover 12 of the outer tube. The electric gripper is used to clamp the side of the polygonal end cap 41 to achieve automatic locking and unlocking.

[0058] In one embodiment, such as Figure 1 and Figure 6 As shown, the outer tube 1 is formed by connecting two semi-circular tubes 11, which facilitates demolding later.

[0059] The semi-circular tube 11 is provided with several ear plates 111, which are then connected by bolts 112.

[0060] When removing the mold, fix the drilled sample mold vertically on the tooling, open the two semi-circular tubes 11, and use a tool to hold the solidified concrete and move it upward to separate it from the inner tube 2.

[0061] In one embodiment, such as Figure 9-11 As shown, the inner plate driving mechanism 5 includes a first guide sleeve 51 connected to the outside of the through hole 32 in the pipe wall, a first slider 52 slidably connected to the first guide sleeve 51, a first elastic member 53 connected between the first guide sleeve 51 and the first slider 52, and a flexible zipper 54 connected to the first slider 52.

[0062] One end of the first slider 52 is fixedly connected to the arc-shaped inner plate 21, and the first elastic element 53 is used to press the first slider 52 to drive the arc-shaped inner plate 21 to slide outward along the radial direction.

[0063] The flexible zipper 54 passes through the through hole 32 in the pipe wall and is wrapped around the pivot 4. When the pivot 4 rotates in the forward direction, the flexible zipper 54 pulls the first slider 52 and causes the arc-shaped inner plate 21 to slide inward along the radial direction.

[0064] In this embodiment, the inner plate drive mechanism 5 adopts a cable drive structure, which includes a first guide sleeve 51, a first slider 52, a first elastic element 53, and a flexible zipper 54.

[0065] The first guide sleeve 51 is integrally connected to the outside of the through hole 32 in the pipe wall. The first slider 52 is fitted into the first guide sleeve 51 with a clearance, and one end of the first slider 52 extends out of the first guide sleeve 51 and is fixedly connected to the arc-shaped inner plate 21. The first elastic element 53 is connected between the first guide sleeve 51 and the first slider 52. The first elastic element 53 is preferably an expansion spring, which is used to press the first slider 52 to drive the arc-shaped inner plate 21 to slide radially outward. The flexible zipper 54 is preferably a steel wire rope, one end of which is connected to the first slider 52. The flexible zipper 54 passes through the through hole 32 in the pipe wall and is wound around the pivot member 4. Preferably, a spiral groove is provided on the pivot member 4 for winding the flexible zipper 54.

[0066] Under normal conditions, the diameter of the inner tube 2 is at its maximum value, the flexible zipper 54 is inactive, and the first elastic element 53 acts entirely, causing the arc-shaped inner plate 21 to drive the arc-shaped outer plate 22 to move outward to its limit position.

[0067] When the pivot 4 is rotated in the forward direction, the flexible zipper 54 overcomes the elastic force of the first elastic element 53, pulls the first slider 52, and causes the arc-shaped inner plate 21 to slide radially inward, thereby driving the arc-shaped outer plate 22 to move inward as a whole. The two adjacent arc-shaped inner plates 21 contract, and the two arc-shaped outer plates 22 contract, ultimately reducing the diameter of the drilled sample. After the arc-shaped inner plate 2 has moved to the appropriate position, the pivot 4 is locked to prevent it from rotating.

[0068] The terms "forward," "reverse," "first direction," and "second direction" used in this invention are merely definitions for ease of description and do not represent the absolute rotation direction of the pivot 4.

[0069] When it is necessary to increase the diameter of the drilled sample, the pivot 4 is rotated in the opposite direction to release the flexible zipper 54. The elastic force of the first elastic element 53 drives the first slider 52 to slide outward, thereby causing the arc-shaped inner plate 21 and the arc-shaped outer plate 22 to slide outward radially. The two adjacent arc-shaped inner plates 21 separate, and the two arc-shaped outer plates 22 separate, ultimately increasing the diameter of the drilled sample. After the arc-shaped inner plate 2 has moved to the appropriate position, the pivot 4 is locked to prevent it from rotating further.

[0070] In one embodiment, such as Figure 12-19 As shown, pivot 4 is screw 42.

[0071] The inner plate drive mechanism 5 includes a second guide sleeve 55 connected to the outside of the through hole 32 in the pipe wall, a second slider 56 slidably connected to the second guide sleeve 55, a second elastic member 57 connected between the second guide sleeve 55 and the second slider 56, and a pressure block 58 sleeved on the screw 42 and threadedly connected to the screw 42.

[0072] One end of the second slider 56 is fixedly connected to the arc-shaped inner plate 21. One end of the second slider 56 has a slider inclined surface 561 that extends inward and downward. The end of the second slider 56 with the slider inclined surface 561 can enter the central tube 3 through the tube wall through hole 32.

[0073] The second elastic element 57 is used to pull the second slider 56 to pull the arc-shaped inner plate 21 to slide radially inward.

[0074] The pressure block 58 includes a cylindrical part 581 and a tapered part 582 connected to the bottom of the cylindrical part 581. A guide structure for guiding the pressure block 58 to slide up and down is provided between the central tube 3 and the cylindrical part 581.

[0075] When the screw 42 rotates in the forward direction, the pressure block 58 slides downward on the screw 42 and presses the slider inclined surface 561 through the tapered part 582, so as to push the second slider 56 and the arc-shaped inner plate 21 to slide outward in the radial direction.

[0076] In this embodiment, the inner plate driving mechanism 5 adopts a lead screw driving structure, which includes a second guide sleeve 55, a second slider 56, a second elastic element 57, and a pressure block 58.

[0077] The second guide sleeve 55 is integrally connected to the outside of the through hole 32 in the pipe wall. The second slider 56 is fitted with the second guide sleeve 55 with clearance. One end of the second slider 56 extends out of the second guide sleeve 55 and is fixedly connected to the arc-shaped inner plate 21. The other end of the second slider 56 has a slider slope 561. In the radial direction, the slider slope 561 slopes outward and upward, and in the direction from the inner tube 2 to the central tube 3, the slider slope 561 slopes inward and downward. The end of the second slider 56 with the slider slope 561 can enter the central tube 3 through the through hole 32 in the pipe wall, and thus slide under the action of the pressure block 58.

[0078] The second elastic element 57 is connected between the second guide sleeve 55 and the second slider 56. The second elastic element 57 is preferably a tension spring, which is used to pull the second slider 56 to pull the arc-shaped inner plate 21 to slide radially inward.

[0079] The outer circumference of the pressure block 58 is circular, and it has a central hole 580 with internal threads. The pivot member 4 is a screw 42, and the pressure block 58 is fitted onto the screw 42, and the two are connected by threads.

[0080] The pressure block 58 includes a cylindrical portion 581 and a tapered portion 582, with the tapered portion 582 integrally connected to the bottom of the cylindrical portion 581. The inclined surface of the tapered portion 582 matches the inclined surface 561 of the slider.

[0081] A guide structure is provided between the central tube 3 and the column part 581 to guide the pressure block 58 to slide up and down without rotating.

[0082] Under normal conditions, the diameter of the inner tube 2 is at its minimum, the pressure block 58 is inactive, and the action is entirely driven by the second elastic element 57, causing the arc-shaped inner plate 21 to move the arc-shaped outer plate 22 inward to its limit position. The slider inclined surface 561 extends entirely into the central tube 3.

[0083] When the screw 42 is turned clockwise, the pressure block 58 slides downward on the screw 42 under the action of the thread. Then, it presses against the inclined surface 561 of the slider through the tapered part 582, overcoming the elastic force of the second elastic element 57, so as to push the second slider 56 to slide outward radially. This, in turn, pushes the arc-shaped inner plate 21 to slide outward radially, and the arc-shaped outer plate 22 also slides outward radially. The two adjacent arc-shaped inner plates 21 separate, and the two arc-shaped outer plates 22 separate, so as to ultimately increase the hole diameter of the drilled sample. After the arc-shaped inner plate 2 moves to the appropriate position, the locking screw 4 is tightened to prevent it from rotating.

[0084] When it is necessary to reduce the diameter of the drilled sample, the screw 42 is turned in the opposite direction. Under the action of the thread, the pressure block 58 slides upward on the screw 42. Under the action of the second elastic element 57, the second slider 56 slides radially inward, thereby driving the arc-shaped outer plate 22 to move inward as a whole. The two adjacent arc-shaped inner plates 21 contract, and the two arc-shaped outer plates 22 contract, so as to ultimately reduce the diameter of the drilled sample. After the arc-shaped inner plate 2 has moved to the appropriate position, the locking screw 4 is tightened to prevent it from rotating.

[0085] In one embodiment, such as Figure 16-18 As shown, the guide structure includes a guide rail 583 provided on the circumferential surface of the column portion 581 and extending axially, and a guide groove 33 provided on the inner surface of the central tube 3 and extending axially. The guide rail 583 is slidably fitted in the guide groove 33, which serves to guide the pressure block 48 to slide up and down, and also to restrict the rotation of the pressure block 48.

[0086] In one embodiment, such as Figure 19 As shown, a limiting block 562 is provided at the bottom of the inclined surface 561 facing the screw 42, and a limiting groove 321 is provided on the bottom side of the through hole 32 of the tube wall facing the screw 42. When the diameter of the inner tube 2 is at its maximum value, the limiting block 562 is engaged in the limiting groove 321 and cannot continue to slide radially outward, thus preventing the arc-shaped inner plate 21 and the arc-shaped outer plate 22 from being stretched too far apart and detaching from each other.

[0087] In one embodiment, such as Figure 15-16 As shown, a limiting ring 43 is provided on the screw 42 below each pressure block 58. When the diameter of the inner tube 2 is at its maximum value, the lower end of the tapered part 582 presses against the limiting ring 43 to prevent the pressure block 58 from sliding down past the second slider 56, thereby preventing the pressure block 58 from being blocked by the reset second slider 56 and ensuring that the pressure block 58 can move upward and reset normally.

[0088] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0089] The above are merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A mold for making drilled samples, characterized in that, It includes an outer tube, an inner tube, a central tube, and a pivot component arranged sequentially from the outside to the inside; The lower part of the outer tube is fixedly installed with a lower cover, and the upper part of the outer tube is detachably installed with an upper cover. The lower cover has a lower cover center hole, and the upper cover has an upper cover center hole. The lower end of the central tube is fixedly connected to the lower cover of the outer tube, and the upper end of the central tube is provided with an upper cover, which protrudes through the central hole of the upper cover. The pivot member passes through the central hole of the lower cover and is pivotally mounted in the central tube. The pivot member is detachably connected to the lower cover of the outer tube by fasteners. The inner tube is slidably mounted between the lower cover of the outer tube and the upper cover of the outer tube. The inner tube includes multiple arc-shaped inner plates that can be joined and separated from each other and multiple arc-shaped outer plates that can be joined and separated from each other. The central angles of the arc-shaped outer plates and the arc-shaped inner plates are equal. Each arc-shaped outer plate is slidably mounted on the outside of two adjacent arc-shaped inner plates. Each of the arc-shaped inner plates is connected to at least one set of inner plate driving mechanisms for driving the arc-shaped inner plate to slide radially. Each set of inner plate driving mechanisms passes through the through hole in the wall of the central tube and is connected to the pivot member. It can be synchronously driven by the pivot member to drive the arc-shaped inner plate to slide radially, thereby adjusting the diameter of the inner tube.

2. The drilling sample preparation mold according to claim 1, characterized in that, Along the axial direction, multiple sets of inner plate drive mechanisms are connected at intervals to the inner side of each of the arc-shaped inner plates.

3. The drilling sample preparation mold according to claim 1, characterized in that, The outer surface of the arc-shaped inner plate is provided with radially outward extending inner plate limiting claws at both ends, and the inner surface of the arc-shaped outer plate is provided with radially inward extending outer plate limiting claws at both ends. Each outer plate limiting claw is slidably positioned between two inner plate limiting claws of one arc-shaped inner plate. When the diameter of the inner tube is at its minimum, each outer plate limiting claw of each arc-shaped outer plate is located in the middle position of the two inner plate limiting claws of an arc-shaped inner plate; When the diameter of the inner tube is at its maximum value, each outer plate limiting claw of each arc-shaped outer plate contacts and limits the contact with one inner plate limiting claw of one arc-shaped inner plate.

4. The drilling sample preparation mold according to claim 1, characterized in that, The outer tube lower cover has multiple lower cover connection holes evenly distributed around the central hole of the lower cover; The lower end of the pivot is provided with a polygonal end cap, which is located below the lower cover of the outer tube. The polygonal end cap is provided with at least two end cap connection holes for installing the fastener. The distance between the center of the end cap connection hole and the axis of the center hole of the lower cover is equal to the distance between the center of the lower cover connection hole and the axis of the center hole of the lower cover. Each of the fasteners passes through the end cap connection hole and may be selectively connected to one of the lower cap connection holes.

5. The drilling sample preparation mold according to claim 1, characterized in that, The outer tube is formed by joining two semi-circular tubes together.

6. The drilling sample preparation mold according to any one of claims 1-5, characterized in that, The inner plate driving mechanism includes a first guide sleeve connected to the outside of the through hole in the pipe wall, a first slider slidably connected to the first guide sleeve, a first elastic element connected between the first guide sleeve and the first slider, and a flexible zipper connected to the first slider. One end of the first slider is fixedly connected to the arc-shaped inner plate, and the first elastic element is used to press against the first slider to drive the arc-shaped inner plate to slide outward radially; The flexible zipper passes through the through hole in the pipe wall and is wrapped around the pivot. When the pivot rotates in the forward direction, the flexible zipper pulls the first slider and causes the arc-shaped inner plate to slide radially inward.

7. The drilling sample preparation mold according to any one of claims 1-5, characterized in that, The pivoting component is a screw; The inner plate driving mechanism includes a second guide sleeve connected to the outside of the through hole in the pipe wall, a second slider slidably connected to the second guide sleeve, a second elastic element connected between the second guide sleeve and the second slider, and a pressure block sleeved on the screw and threadedly connected to the screw. One end of the second slider is fixedly connected to the arc-shaped inner plate. One end of the second slider has a slider slope extending inward and downward with the central tube as a reference. The end of the second slider with the slider slope can enter the central tube through the tube wall through hole. The second elastic element is used to pull the second slider to pull the arc-shaped inner plate to slide radially inward; The pressure block includes a cylindrical part and a tapered part connected to the bottom of the cylindrical part, and a guide structure is provided between the central tube and the cylindrical part to guide the pressure block to slide up and down; When the screw rotates in the forward direction, the pressure block slides downward on the screw and presses the inclined surface of the slider through the tapered portion, thereby pushing the second slider and the arc-shaped inner plate to slide outward radially.

8. The drilling sample preparation mold according to claim 7, characterized in that, The guide structure includes a guide rail provided on the circumferential surface of the column and extending along the axial direction, and a guide groove provided on the inner surface of the central tube and extending along the axial direction. The guide rail is slidably fitted into the guide groove.

9. The drilling sample preparation mold according to claim 7, characterized in that, The bottom of the slider inclined surface facing the screw is provided with a limiting block, and the bottom of the tube wall through hole facing the screw is provided with a limiting groove; When the inner tube diameter is at its maximum value, the limiting block engages in the limiting groove.

10. The drilling sample preparation mold according to claim 7, characterized in that, A limiting ring is provided on the screw below each of the pressure blocks; When the inner tube diameter is at its maximum value, the lower end of the tapered portion presses against the limiting ring.

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