Device for core drilling and sampling
By designing a device for core sampling, a four-bar linkage and the movement of a sliding sleeve are used to achieve line contact between the chuck and the core sample, solving the problem of core sample easily falling off in the prior art and improving sampling efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY NO 2 ENG GROUP CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-01
AI Technical Summary
Existing core sample clamps have a small contact area when gripping core samples, which makes the core samples easy to fall out and affects the efficiency of on-site sampling.
Design a device for core sampling, including a lifting rod, a sliding sleeve and at least three sampling rods. Through a four-bar linkage and the movement of the sliding sleeve, the clamp and the core sample are made into line contact, and the core sample is fixed and clamped by a nut or a limiting member.
The increased contact points between the clamp and the core sample improve clamping stability, reduce core sample drop, and increase the efficiency of on-site sampling.
Smart Images
Figure CN224189594U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of core sampling for engineering entity testing, and in particular to a device for core sampling. Background Technology
[0002] In various engineering construction projects, core sampling is an essential step to ensure that concrete structures, concrete pavements, and asphalt pavements meet relevant specifications and standards. Specifically, according to established specifications, specialized equipment is used to drill core samples from the corresponding structures or pavements. These core samples are then sent to a laboratory for a series of tests. The test results are used to evaluate key performance indicators such as the structure's compressive strength, splitting tensile strength, and flexural strength. Core samples are generally cylindrical in shape.
[0003] After core drilling is completed, core samples are often left inside the borehole. Currently, core sample pliers are commonly used on-site to remove these samples. However, existing core sample pliers have certain design limitations. Their overall shape resembles scissors, which means that when the pliers' jaws are inserted into the gap between the core sample and the borehole, they can only make point contact with the top edge of the core sample. This results in a relatively small contact area between the jaws and the core sample, making it very easy for the core sample to fall out during the retrieval process, thus affecting the efficiency of on-site sampling. Utility Model Content
[0004] The purpose of this invention is to overcome the problem in the prior art that the core sample is prone to falling off during the core sample clamping process, which affects the efficiency of on-site sampling, and to provide a device for core sampling.
[0005] This utility model provides a device for core sampling, comprising:
[0006] A lifting rod, on which a sliding sleeve is fitted, the sliding sleeve being movable along the axial direction of the lifting rod;
[0007] At least three sampling rods, all of which are evenly arranged around the axis of the lifting rod;
[0008] One end of each sampling rod is connected to the lifting rod via a first connecting rod, and the body of each sampling rod is connected to the sliding sleeve via a second connecting rod; wherein, the two ends of the first connecting rod are respectively hinged to the sampling rod and the lifting rod, and the two ends of the second connecting rod are respectively hinged to the sampling rod and the sliding sleeve;
[0009] The other end of each sampling rod is a clamp.
[0010] This invention provides a device for core sampling. The chuck is used to directly contact the outer wall of the core sample, and its function is to grip the core sample. A first connecting rod and a second connecting rod connect the sampling rod to the lifting rod. All the sampling rods are evenly arranged around the axis of the lifting rod. Furthermore, the two ends of the first connecting rod are hinged to the sampling rod and the lifting rod, respectively, and the two ends of the second connecting rod are hinged to the sampling rod and the sliding sleeve, respectively. This design forms a four-bar linkage with each sampling rod and its corresponding first connecting rod, second connecting rod, and lifting rod. Using this four-bar linkage and by driving the movement of the sliding sleeve, the sampling rod can be adjusted to be parallel to the lifting rod. Simultaneously, the distance between the sampling rod and the lifting rod can be flexibly adjusted according to the size of the core sample, thereby accommodating core samples with different outer diameters. Since the core sample is usually cylindrical, when all the sampling rods are parallel to the axis of the core sample and the clamps of each sampling rod are in contact with the outer wall of the core sample, compared with traditional core sample pliers, the contact position of each clamp with the core sample in this solution is a line contact, which can provide a better clamping effect.
[0011] When all the clamps are in contact with the outer wall of the core sample, the sliding sleeve can be moved and fixed along the lifting rod in the direction that causes the second connecting rod to generate tension. This, in turn, drives the second connecting rod to move the clamp of each sampling rod toward the core sample, thereby achieving the purpose of clamping the core sample. When the sliding sleeve is fixed, the second connecting rod can maintain tension, so that the clamps can continuously clamp the core sample.
[0012] This application uses at least three clamps of the sampling rod to hold the core sample, increasing the number of contact points between the clamps and the core sample. Furthermore, the clamps can form line contact at the contact points with the core sample, making the clamping of the core sample more stable and effectively reducing the occurrence of the core sample falling out. This avoids problems such as repeated operations and wasted time caused by the core sample falling out, thereby improving the sampling efficiency on site.
[0013] The sliding sleeve can be moved and fixed manually, and then secured to the lifting rod using a limiting component. The limiting component can be a pin, clamp, or nut. When the second connecting rod is subjected to tension, causing the sliding sleeve to tend to slide, the limiting component restricts the movement of the sliding sleeve, thus keeping the second connecting rod under tension.
[0014] The lengths of the first and second connecting rods are relatively flexible; they can be the same or different. However, regardless of the length, it is necessary to ensure that the sampling rod and the lifting rod remain parallel under certain specific conditions.
[0015] Preferably, the lengths of the first and second connecting rods corresponding to each sampling rod are equal. When the first and second connecting rods are parallel to each other, each sampling rod, along with its corresponding first and second connecting rods and the lifting rod, forms a parallelogram linkage mechanism. Under the action of this parallelogram linkage mechanism, each sampling rod can move closer to or further away from the lifting rod while remaining parallel to it. This design ensures that all sampling rods can adjust their relative positions more quickly to accommodate core samples of different diameters, thereby significantly improving the convenience and applicability of the entire device.
[0016] Preferably, a nut is fitted onto the lifting rod, and the lifting rod is a lead screw that matches the nut. The nut is used to lock the sliding sleeve. Compared to using a clamp to fix the sliding sleeve, this solution uses the nut to fix the sliding sleeve. This fixing method can provide a greater reaction force to the sliding sleeve, thereby achieving a better fixing effect. If the clamp is used for fixing, it may slip off when the force on the sliding sleeve is too great. In addition, the nut not only has a fixing function, but can also adjust the position of the sliding sleeve, thereby adjusting the tension of the second connecting rod, and ultimately adjusting the clamping force of the sampling rod chuck. In this way, it is possible to effectively avoid the chuck damaging the core sample due to excessive tightness, or the core sample falling off due to excessive looseness.
[0017] Preferably, a fixing sleeve is fitted onto the lifting rod, and the first connecting rod is hinged to the lifting rod through the fixing sleeve. In this design, the fixing sleeve increases the contact area at the connection between the lifting rod and the first connecting rod, thereby enhancing the stability of the connection between the first connecting rod and the lifting rod.
[0018] Preferably, the chuck has an arc surface that matches the shape of the sidewall of the core sample. This design further increases the contact area between the chuck and the core sample, thereby enhancing the friction between the chuck and the core sample and effectively preventing the core sample from falling off during sampling.
[0019] Preferably, the arc surface is engraved with texture. The texture can further increase the roughness of the arc surface, thereby enhancing the friction between the chuck and the core sample.
[0020] Preferably, a pull ring is provided at the end of the lifting rod away from the sliding sleeve. By operating the pull ring, the entire device can be easily lifted, thereby facilitating core sample collection.
[0021] Preferably, the sampling rod is a solid steel bar.
[0022] Preferably, the first and second connecting rods are hollow steel bars. Since the first and second connecting rods only bear axial force and not complex stresses in other directions, hollow steel bars are chosen for manufacturing. Using hollow steel bars saves more material than solid steel bars while maintaining the same outer diameter.
[0023] Preferably, the outer surface of the sliding sleeve has an uneven shape. When the user operates the sliding sleeve with their hand, the uneven surface can significantly increase the friction between the hand and the sliding sleeve. This design can effectively prevent slippage when the hand applies force to push or pull the sliding sleeve, allowing the user to control the movement of the sliding sleeve more steadily and accurately, improving the convenience and accuracy of operation.
[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0025] This utility model provides a device for core sampling, which uses at least three clamps of the sampling rod to hold the core sample, increasing the number of contact points between the clamps and the core sample. Furthermore, the clamps can form line contact at the contact points with the core sample, making the clamping of the core sample more stable and effectively reducing the occurrence of the core sample falling. This avoids problems such as repeated operations and wasted time caused by the core sample falling, thereby improving the sampling efficiency on site. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of a device used for core sampling.
[0027] Figure 2 for Figure 1 A cross-sectional view along section line AA.
[0028] Figure 3 This is a schematic diagram of a device for core sampling, used to clamp and collect core samples.
[0029] Figure 4 This is a schematic cross-sectional view of the chuck of a device used for core sampling.
[0030] Marked in the image:
[0031] 1-Lifting lever,
[0032] 2-Fixing sleeve,
[0033] 3-First link,
[0034] 4-Second link,
[0035] 5-Sliding sleeve,
[0036] 6-Sampling rod,
[0037] 601-clamp,
[0038] 7-nut,
[0039] 8-Pull ring,
[0040] 9-Core sample. Detailed Implementation
[0041] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0042] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0043] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0044] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0045] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0046] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0047] Example 1
[0048] like Figures 1 to 4 As shown, an apparatus for core sampling includes a lifting rod 1 and at least three sampling rods 6.
[0049] A sliding sleeve 5 is fitted onto the lifting rod 1, and the sliding sleeve 5 can move along the axial direction of the lifting rod 1.
[0050] All sampling rods 6 are evenly arranged around the axis of the lifting rod 1. Specifically, there are 4 sampling rods 6, and the length of each sampling rod 6 can be 250 mm. The distance between all sampling rods 6 and the axis of the lifting rod 1 can be equal to the cross-sectional radius of the core sample 9.
[0051] One end of each sampling rod 6 is connected to the lifting rod 1 via the first connecting rod 3, and the body of each sampling rod 6 is connected to the sliding sleeve 5 via the second connecting rod 4; wherein, the two ends of the first connecting rod 3 are respectively hinged to the sampling rod 6 and the lifting rod 1, and the two ends of the second connecting rod 4 are respectively hinged to the sampling rod 6 and the sliding sleeve 5.
[0052] The other end of each sampling rod 6 is a chuck 601. Specifically, the overall thickness of the chuck 601 is less than the width of the gap formed between the core sample 9 and the drilled hole.
[0053] In an optional implementation, the lengths of the first link 3 and the second link 4 corresponding to each sampling rod 6 can be equal. Specifically, the lengths of the first link 3 and the second link 4 can be 50mm-100mm, and the specific lengths can be 50mm, 60mm, 80mm, 90mm, or 100mm.
[0054] In an optional embodiment, a nut 7 may be fitted onto the lifting rod 1. The lifting rod 1 is a lead screw that matches the nut 7, and the nut 7 is used to lock the sliding sleeve 5.
[0055] Specifically, when the sliding sleeve 5 moves upward to generate tension in the second connecting rod 4, the nut 7 is positioned below the sliding sleeve 5. When the sliding sleeve 5 moves downward to generate tension in the second connecting rod 4, the nut 7 is positioned above the sliding sleeve 5.
[0056] In an optional embodiment, a fixing sleeve 2 may be fitted onto the lifting rod 1, and the first connecting rod 3 is hinged to the lifting rod 1 via the fixing sleeve 2. Specifically, the fixing sleeve 2 is welded to the lifting rod 1, and the fixing sleeve 2 is provided with an ear plate. The ear plate has a through hole, and the end of the first connecting rod 3 connected to the fixing sleeve 2 also has a corresponding through hole. By inserting a pin into the corresponding through holes on the ear plate and the first connecting rod 3, a hinged connection between the ear plate and the first connecting rod 3 is achieved.
[0057] In an optional embodiment, the chuck 601 may have an arcuate surface that matches the shape of the sidewall of the core sample 9. The arcuate surface is oriented towards the core sample 9 for contact with the outer surface of the core sample 9.
[0058] In an optional embodiment, the arc surface may be engraved with textures.
[0059] In an optional embodiment, a rubber pad may be provided on the arc surface. The rubber pad has a thickness of 0.5mm-1mm and is bonded to the arc surface with structural adhesive. The rubber pad provides a higher coefficient of friction, further increasing the friction between the chuck 601 and the core sample 9, effectively preventing the core sample 9 from falling off during sampling.
[0060] In an optional embodiment, a pull ring 8 may be provided at the end of the lifting rod 1 away from the sliding sleeve 5. Specifically, the pull ring 8 is made of round steel with a diameter of 10mm and has an overall elliptical ring structure. The major axis of the elliptical ring structure ranges from 10cm to 16cm, and the minor axis ranges from 5cm to 8cm.
[0061] In an optional implementation, the sampling rod 6 can be a solid steel bar. Specifically, the cross-sectional dimensions of the sampling rod 6 can be 5mm × 10mm.
[0062] In an optional embodiment, the first connecting rod 3 and the second connecting rod 4 can be hollow steel bars. Specifically, both the first connecting rod 3 and the second connecting rod 4 can be round steel bars with a diameter of 8mm-12mm, specifically 8mm, 10mm, or 12mm.
[0063] In an optional embodiment, the lifting rod 1 can be a lead screw with a diameter of 8mm-16mm, specifically 8mm, 10mm, 12mm, 14mm, 15mm, or 16mm. Specifically, the inner diameter of the sliding sleeve 5 is 1mm-2mm larger than the diameter of the lifting rod 1, and the wall thickness of the sliding sleeve 5 is 4mm-6mm. The sliding sleeve 5 is provided with an ear plate. A through hole is provided on the ear plate, and a corresponding through hole is also provided at the end of the second connecting rod 4 that connects to the sliding sleeve 5. By inserting a pin into the corresponding through holes on the ear plate and the second connecting rod 4, a hinged connection between the ear plate and the second connecting rod 4 is achieved.
[0064] In an optional embodiment, the outer surface of the sliding sleeve 5 has an uneven shape. Specifically, the uneven shape conforms to the gripping shape of a human hand for ease of holding.
[0065] Example 2
[0066] This embodiment describes the use of the device for core sampling described in Embodiment 1, including the following steps:
[0067] Device installation: Adjust all sampling rods 6 to be parallel to each other, and ensure that the outer contour dimensions formed by the combination of all sampling rods 6 match the cross-sectional diameter of the core sample 9 to be cored. Then, insert all sampling rods 6 into the gap formed between the core sample 9 and the drill hole.
[0068] Clamping the core sample: Operate the sliding sleeve 5 to move it in a direction that can apply tension to the second connecting rod 4. During this process, the second connecting rod 4 generates a force that causes the chuck 601 of the sampling rod 6 to move towards the core sample 9, ultimately clamping the core sample 9. After the sliding sleeve 5 moves to the predetermined position, use the nut 7 to lock the sliding sleeve 5, restricting its movement to maintain the clamped state of the core sample 9.
[0069] Remove the core sample: Lift the pull ring 8 upwards to remove the entire device along with the clamped core sample 9. Then, adjust the nut 7 to release the tension applied by the second connecting rod 4. At this point, the clamp 601 of the sampling rod 6 no longer applies clamping force to the core sample 9, allowing the core sample 9 to be separated from the device, completing the sampling operation. Finally, the removed core sample 9 is sealed and sent to the relevant department for inspection.
[0070] Compared to traditional core sample pliers, the chuck 601 of the sampling rod 6 of the device of this application can be inserted into a deeper part of the gap between the core sample 9 and the drill hole, thereby increasing the contact area between the chuck 601 and the core sample 9 and enhancing the friction between the chuck 601 and the core sample 9.
[0071] Traditional core sample pliers, due to their small contact area with the core sample (9), typically employ an extended plier handle to increase pressure at the contact point using leverage, thus preventing the core sample (9) from falling during handling. However, this method has significant drawbacks: firstly, excessive force can easily cause the core sample (9) to break at the gripping point; secondly, it requires considerable hand strength from the operator, otherwise, insufficient pressure cannot be applied, leading to sampling failure and necessitating repeated attempts.
[0072] In contrast, the device involved in this application has a larger contact area with the core sample 9. Furthermore, the movement of the sliding sleeve 5 drives the second connecting rod 4 to apply clamping pressure to the chuck 601, and the locking of the nut 7 maintains the clamped state of the core sample 9, eliminating the need for continuous clamping force from the operator. This not only reduces the risk of the core sample 9 breaking at the clamping point but also saves the operator's physical effort, increases the success rate of one-time sampling, avoids repeated attempts, and thus improves sampling efficiency.
[0073] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A device for core sampling, characterized in that, include: A lifting rod (1) is provided with a sliding sleeve (5) which can move along the axial direction of the lifting rod (1). At least three sampling rods (6) are arranged evenly around the axis of the lifting rod (1); One end of each sampling rod (6) is connected to the lifting rod (1) via a first connecting rod (3), and the body of each sampling rod (6) is connected to the sliding sleeve (5) via a second connecting rod (4); wherein, the two ends of the first connecting rod (3) are respectively hinged to the sampling rod (6) and the lifting rod (1), and the two ends of the second connecting rod (4) are respectively hinged to the sampling rod (6) and the sliding sleeve (5); The other end of each of the sampling rods (6) is a clamp (601).
2. The device for core sampling according to claim 1, characterized in that, The lengths of the first link (3) and the second link (4) corresponding to each sampling rod (6) are equal.
3. The apparatus for core sampling according to claim 1, characterized in that, A nut (7) is fitted on the lifting rod (1). The lifting rod (1) is a lead screw that matches the nut (7). The nut (7) is used to lock the sliding sleeve (5).
4. The apparatus for core sampling according to claim 1, characterized in that, A fixed sleeve (2) is fitted on the lifting rod (1), and the first connecting rod (3) is hinged to the lifting rod (1) through the fixed sleeve (2).
5. A device for core sampling according to any one of claims 1-4, characterized in that, The chuck (601) has an arc surface that matches the shape of the sidewall of the core sample (9).
6. The apparatus for core sampling according to claim 5, characterized in that, The arc surface is engraved with patterns.
7. The apparatus for core sampling according to claim 5, characterized in that, A pull ring (8) is provided at one end of the lifting rod (1) away from the sliding sleeve (5).
8. The apparatus for core sampling according to claim 5, characterized in that, The sampling rod (6) is a solid steel bar.
9. The apparatus for core sampling according to claim 5, characterized in that, The first connecting rod (3) and the second connecting rod (4) are hollow steel bars.
10. The apparatus for core sampling according to claim 5, characterized in that, The outer surface of the sliding sleeve (5) is uneven.