A spin-in core testing clamp
The rotary core testing clamping device uses a transmission screw and a locking device to achieve stable clamping of the core, which solves the problem of complex structure of existing devices, provides a simple and fast core testing method, and ensures the accuracy and adaptability of the test data.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANCHANG CAMPUS OF EAST CHINA UNIV OF TECH
- Filing Date
- 2025-06-12
- Publication Date
- 2026-07-21
AI Technical Summary
Existing core testing clamping devices are complex in structure and require complicated assembly, making them unsuitable for rapid outdoor testing in core drilling.
The core testing clamping device adopts a screw-in type, including a screw-in slide, a movable clamping arm and a fixed clamping arm. The core is stably clamped by a transmission screw and a locking device. Conductive sponge and drainage holes are provided to ensure a stable connection between the electrode and the core. It is also equipped with a detachable structure to adapt to different core shapes and sizes.
It enables simple and quick clamping of the core, ensures a stable connection between the electrode and the core, improves the accuracy and flexibility of the test data, and adapts to different core types.
Smart Images
Figure CN224526937U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a rotary core testing clamping device, which belongs to the field of geophysical exploration and is an auxiliary tooling for core testing. Background Technology
[0002] As physical samples of underground rocks, rock cores directly reflect the characteristics of the underground geological environment through their internal structure and physical properties. In the field of geophysical exploration, rock core analysis undoubtedly occupies a pivotal position. In-depth analysis of rock cores can not only provide key oil and gas reservoir information for oil exploration, but also provide valuable geological data support for the development and utilization of geothermal energy and the exploration and development of water resources.
[0003] Core analysis involves the measurement of several key parameters, such as porosity, permeability, saturation, and fracture development. During the measurement and analysis of these parameters using specialized instruments, ensuring a stable and effective connection between the testing electrode and the core is crucial. An unstable connection between the electrode and the core can lead to fluctuations or even errors in the test results, severely impacting the interpretation and application of subsequent geological data.
[0004] Chinese patent application CN202211683056.2 discloses a device and method for measuring the resistivity of seepage in dense rock fractures under high temperature and high pressure conditions. The core holder used has a complex structure and complicated assembly steps. It requires an additional pressure application device to clamp the core. Therefore, this core clamping method is only suitable for laboratory testing and is not suitable for rapid outdoor testing of core drilling. Summary of the Invention
[0005] The technical problem solved by this utility model is to provide a simple and easy-to-operate rotary core testing clamping device, which addresses the problem of complex structure and complicated assembly of existing core testing clamping fixtures.
[0006] This utility model is achieved using the following technical solution:
[0007] A rotary core testing clamping device includes a rotary slide 200 and a movable clamping arm 110 and a fixed clamping arm 120 disposed on the rotary slide 200.
[0008] The screw-in slide 200 is provided with a transmission screw 204, the fixed clamping arm 120 is fixedly mounted on the screw-in slide 200 at one end of the transmission screw 204, and the movable clamping arm 110 is fixed to the sliding end of the transmission screw 204 and is movably mounted relative to the fixed clamping arm 120.
[0009] The movable clamping arm 110 and the fixed clamping arm 120 are provided with coaxial and facing core positioning grooves 111. The core positioning groove 111 is provided with an electrode that is in clamping contact with the end face of the core and a conductive sponge that is wetted with a conductive solution. At the lowest point of the core positioning groove 111, there is a drainage hole 113 extending outward from the clamping arm. The drainage hole 113 is connected to the water tank 130.
[0010] In a rotary core testing clamping device of this utility model, the rotary slide 200 is further provided with a movable clamping platform 201 and a fixed clamping platform 202; the movable clamping platform 201 serves as the sliding end of the transmission screw 204, the movable clamping arm 110 is detachably mounted on the movable clamping platform 201, the fixed clamping platform 202 is fixed on the rotary slide 200, and the fixed clamping arm 120 is detachably mounted on the fixed clamping platform 202. The detachable structure enables quick replacement of the movable clamping arm and the fixed clamping arm.
[0011] In a rotary core testing clamping device of this utility model, the rotary slide 200 is further provided with a guide rail 203 parallel to the transmission screw 204, and the movable clamping platform 201 is slidably assembled on the guide rail 203, which ensures the sliding stability of the movable clamping arm clamping the core relative to the fixed clamping arm.
[0012] In a rotary core testing clamping device of this utility model, the movable clamping platform 201 and the transmission screw 204 are connected by a ball screw drive.
[0013] In a core testing clamping device of this utility model, a locking device 205 is further provided on the transmission screw 204 to realize the clamping and locking of the core by the moving clamping arm and the fixed clamping arm.
[0014] In a screw-type core testing clamping device of this utility model, the end of the transmission screw 204 is provided with a screw-in handle 206 for rotating the transmission screw, which facilitates the sliding of the clamping arm by rotating and screwing in.
[0015] In a rotary core testing clamping device of this utility model, the outer side of the movable clamping arm 110 and the fixed clamping arm 120 is provided with a water tank positioning platform 114 for placing the water tank, which is beneficial to the stable placement of the water tank.
[0016] In a rotary core testing clamping device of this utility model, the movable clamping arm 110 and the fixed clamping arm 120 are further provided with electrode lead-out holes 112 that communicate with the core positioning groove thereon, for connecting the electrode lead-out signal line inside the core positioning groove to the signal acquisition device.
[0017] In a rotary core testing clamping device of this utility model, the rotary slide 200 is further provided with a scale 208 for detecting the core size.
[0018] In a rotary core testing clamping device of this utility model, the movable clamping platform 201 and the scale 208 on the rotary slide 200 form a vernier scale to realize rapid detection of the length of the clamped core.
[0019] The present invention, by adopting the above-described technical solution, has the following beneficial effects:
[0020] (1) In a core testing clamping device of the present invention, the movable clamping arm is installed on the movable clamping platform and is movably set relative to the fixed clamping arm. By rotating the transmission screw on the screwing slide, the movable clamping arm can be driven to slide towards the fixed clamping arm to clamp the core. The movable clamping arm and the fixed clamping arm are provided with core positioning grooves for positioning the end of the core. Electrode plates are embedded in the core positioning grooves and clamped to contact the two ends of the core. The electrode lead-out holes connect the electrode plates to external professional signal acquisition and detection equipment. The clamping and disassembly operation of the core is simple.
[0021] (2) The movable clamping arm of this utility model achieves axial self-locking of the rock core through the threaded transmission between the transmission screw and the movable clamping platform, realizing the clamping and fixing of the rock core for testing. The threaded transmission has sufficient clamping force to ensure that the rock core will not shift or deform during the testing process. In addition, the position of the movable clamping arm can be locked with the locking device, realizing the reliability of the rock core clamping by the movable clamping arm and the fixed clamping arm.
[0022] (3) The movable clamping arm and the fixed clamping arm of this utility model are fixed on their respective clamping platforms by a detachable structure. By disassembling and replacing the clamping arms with different core positioning grooves, it can adapt to core samples of different shapes, sizes and hardness, and has high flexibility and adaptability for different types of core testing.
[0023] (4) The present invention provides drainage holes in the core positioning groove on the movable clamping arm and the fixed clamping arm to discharge the conductive solution that overflows from the conductive sponge on the electrode side during the clamping process. The conductive solution is collected by the water tank on the outside. The water tank is embedded on the outside of the clamping arm and can be flexibly disassembled for easy cleaning. At the same time, it avoids the conductive solution squeezed out flowing to the lower rotary slide and causing corrosion to the platform components.
[0024] (5) The present invention sets a scale on the sliding slide and uses the sliding moving clamping platform as a vernier, which together with the scale on the sliding slide forms a vernier scale, which can be used to measure the size of the core.
[0025] In summary, the rotary core testing clamping device provided by this utility model has a simple and reliable clamping structure, and the core clamping and disassembly operation is simple and quick. During the testing process, it can ensure that the core is connected to the electrode in a stable posture, ensuring a stable and effective connection between the testing electrode and the core, thereby ensuring the accuracy and validity of the test data.
[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of a core clamping device for a rotary core testing embodiment.
[0028] Figure 2 This is a cross-sectional view of the movable clamping arm in the embodiment.
[0029] Figure 3 This is a top view of the rotary slide in the embodiment.
[0030] Figure 4 This is a front view of the rotary slide in the embodiment.
[0031] The labels in the diagram are as follows: 100-core, 110-moving clamping arm, 111-core positioning groove, 112-electrode lead-out hole, 113-drainage hole, 114-water tank positioning platform, 115-clamping arm fixing screw, 120-fixed clamping arm, 130-water tank, 200-screw-in slide, 201-moving clamping platform, 202-fixed clamping platform, 203-guide rail, 204-transmission screw, 205-locking device, 206-screw-in handle, 207-clamping arm fixing screw hole, 208-scale. Detailed Implementation Example
[0032] See Figure 1 The rotary core testing clamping device shown in the figure is a specific embodiment of this utility model, including a movable clamping arm 110, a fixed clamping arm 120, a water tank 130, and a rotary slide 200. The movable clamping arm 110 and the fixed clamping arm 120 are arranged on the rotary slide 200, wherein the fixed clamping arm 120 is fixedly arranged on the rotary slide 200. The movable clamping arm 110 moves towards the fixed clamping arm 120 to clamp and fix the core 100. Electrode signal lines connecting the two ends of the core 100 are led out from the outside of the movable clamping arm 110 and the fixed clamping arm 120. The water tank 130 is arranged on the outside of the movable clamping arm 110 and the fixed clamping arm 120 to collect the conductive solution squeezed out by the electrodes when the core is clamped during the clamping process.
[0033] For details, please refer to [link / reference]. Figure 2 , Figure 3 and Figure 4A transmission screw 204 is rotatably mounted on a screw-in slide 200. A fixed clamping arm 120 is fixedly mounted on the screw-in slide 200 at one end of the transmission screw 204. A movable clamping arm 110 is fixed to the sliding end of the transmission screw 204 and is movably mounted relative to the fixed clamping arm 120. Both the movable clamping arm 110 and the fixed clamping arm 120 are provided with core positioning grooves 111. The cross-section of the core positioning groove 111 matches the cross-section of the core. After the movable clamping arm 110 and the fixed clamping arm 120 are mounted on the screw-in slide 200, the two core positioning grooves 111 are coaxially distributed facing each other. An electrode is provided inside the core positioning groove 111 to make clamping contact with the end face of the core. A conductive sponge soaked in conductive solution is provided between the electrode and the end face of the core. A drainage hole 113 extending outward from the clamping arm is provided at the lowest point of the core positioning groove 111. The drainage hole 113 is connected to a water tank 130.
[0034] The two ends of the core 100 are aligned between the movable clamping arm 110 and the fixed clamping arm 120, which are separated on the screw-in slide. The movable clamping arm 110 slides towards the fixed clamping arm 120, embedding the two ends of the core 100 into the core positioning grooves 111 on the movable clamping arm 110 and the fixed clamping arm 120, respectively. Electrodes and conductive solution, which are pre-arranged to mate with the two ends of the core 100, are placed in the core positioning grooves 111. The drive screw 204 of the screw-in slide rotates, and through the threaded drive, the movable clamping arm 110 is continuously pressed between the movable clamping arm 110 and the fixed clamping arm 120, while also pressing the electrodes to the two ends of the core. The core positioning groove 111 provides positioning for the core 100 during the clamping process, and the drainage hole 113 at its lower part drains the conductive solution overflowing from the squeezed conductive sponge out of the core positioning groove for collection.
[0035] In this embodiment, a movable clamping platform 201 and a fixed clamping platform 202 are also provided on the screw-in slide 200. The movable clamping platform 201 serves as the sliding end of the transmission screw 204. The movable clamping arm 110 is detachably mounted on the movable clamping platform 201. The fixed clamping platform 202 is fixed on the screw-in slide 200. The fixed clamping arm 120 is detachably mounted on the fixed clamping platform 202. The movable clamping arm and the fixed clamping arm can be quickly replaced through the detachable structure.
[0036] Specifically, the mobile clamping platform 201 and the fixed clamping platform 202 are provided with clamping arm fixing screw holes 207, and corresponding clamping arm fixing screws 115 are provided on the mobile clamping arm 110 and the fixed clamping arm 120. The clamping arms can be detachably installed on their respective clamping platforms through the screw connectors. The mobile clamping arm 110 and the fixed clamping arm 120 are detachable and can be removed individually for cleaning and maintenance. Furthermore, by disassembling and replacing the clamping arms with core positioning grooves of different sizes, it is possible to match and replace cores of different sizes.
[0037] The sliding table 200 has guide rails 203 parallel to the transmission screw 204 on both sides. The movable clamping platform 201 is slidably mounted on the guide rails 203, ensuring the sliding stability of the movable clamping arm relative to the fixed clamping arm when clamping the rock core. The movable clamping platform 201 and the transmission screw 204 are connected by a ball screw drive. A ball nut is provided on the movable clamping platform 201, which forms a ball screw assembly with the helical groove on the transmission screw 204. The rotational motion of the transmission screw 204 is converted into the linear sliding motion of the movable clamping platform 201 through the ball screw drive, realizing the smooth sliding of the movable clamping arm 110.
[0038] One end of the transmission screw 204 extends out of the screw-in slide 200, and a screw-in handle 206 is fixedly mounted on it coaxially with the transmission screw 204 to facilitate rotation of the transmission screw 204. In addition, this embodiment also provides a locking device 205 on the transmission screw 204. The locking device 205 is a locking nut set between the screw-in slide and the transmission screw 204. By tightening the locking device 205, the transmission screw 204 is locked relative to the screw-in slide 200. The clamping and locking are achieved after the moving clamping arm 110 and the fixed clamping arm 120 clamp the rock core.
[0039] The core positioning grooves 111 on the movable clamping arm 110 and the fixed clamping arm 120 have the same structure and are mirror-symmetrical after being assembled on the rotary slide table 200. Taking the movable clamping arm 110 as an example, the specific details are as follows: Figure 2 As shown, the movable clamping arm 110 is provided with an electrode lead-out hole 112 that communicates with the core positioning groove 111 on it. When installing and clamping the core, the circular electrode sheet needs to be placed at the bottom of the core positioning groove 111 first. The signal line connecting the outer side of the electrode extends out through the electrode lead-out hole 112 to the outer side of the movable clamping arm, and is connected to the core signal acquisition device together with the signal line led out from the fixed clamping arm 120. The specific core signal acquisition technology is a well-known technology in the field and is not within the protection scope of this utility model. This embodiment will not be elaborated here.
[0040] The movable clamping arm 110 and the fixed clamping arm 120 are provided with a water tank positioning platform 114 for placing the water tank. During core testing, a sponge soaked in conductive solution is placed between the electrode and the core to increase the conductivity between the contact electrode and the core. The conductive solution squeezed out during clamping flows into the water tank through the drainage hole. The drainage hole 113 on the movable clamping arm 110 and the fixed clamping arm 120 is angled downwards, and the outlet of the drainage hole 113 extends above the water tank 130 via a connector, facilitating the rapid discharge of the conductive solution squeezed out during core clamping into the water tank. The water tank positioning platform 114 is designed as a groove for embedding the water tank. The water tank 130 is more stable when embedded in the water tank positioning platform 114, preventing slippage and tipping.
[0041] To enable rapid measurement of the core dimensions during clamping testing, this embodiment also includes a scale 208 on the sliding table 200 for detecting core dimensions. The scale 208 can directly measure the length and diameter of the unclamped core. For clamped cores, this embodiment further combines the movable clamping platform 201 and the scale 208 on the sliding table 200 to form a vernier scale. The scale 208 is set parallel to the sliding direction of the movable clamping platform 201. The process of the movable clamping platform 201 clamping the core along the scale completes the contact between the two ends of the core. The origin of the scale 208 is aligned with the bottom of the core positioning groove on the fixed clamping arm. After clamping the core, the movable clamping platform 201, acting as a vernier, can directly read the value on the scale 208 to obtain the length of the clamped core.
[0042] The operation procedure of the rotary core testing clamping device in this embodiment is as follows:
[0043] 1. First, fix the movable clamping arm 110 and the fixed clamping arm 120 on the movable clamping platform 201 and the fixed clamping platform 202 of the screw-in slide table 200. It is necessary to keep them stable and prevent them from loosening.
[0044] 2. Next, place the water tank 130 into the water tank positioning platform 114 outside the movable clamping arm 110 and the fixed clamping arm 120, ensuring that the outlet connector of the drain hole 113 is aligned with the top of the water tank 130 to prevent the conductive solution squeezed out during clamping from eroding the lower screw slide 200; install the circular copper electrode sheet in the core positioning groove of the movable clamping arm 110 and the fixed clamping arm 120, and lead out the signal line connected to it through the electrode inlet to connect it to the signal acquisition equipment.
[0045] 3. Adding copper sulfate solution between the copper electrode and the core as a conductive solution can improve the acquisition of electrical signals for detecting core parameters. Specifically, a sponge soaked in copper sulfate solution is placed on the side of the copper electrode and the core that is in contact. By rotating the transmission screw 204, the moving clamping arm 110 slides towards the fixed clamping arm 120 until it is embedded in the core positioning groove at the end of the core and clamps the core. Then, the transmission screw 204 is locked by the locking device 205 to ensure that the core and the clamping arm will not loosen.
[0046] 4. After the core is tested, the movable clamping arm 110, the fixed clamping arm 120 and the water tank 130 can be disassembled for cleaning. Since the screw-in slide contains precision transmission screws and other parts, it effectively prevents the screw-in slide from being corroded by the conductive solution.
[0047] In this document, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", and "horizontal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of clarifying the technical solution and for the convenience of description, and therefore should not be construed as limiting the present utility model.
[0048] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.
[0049] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A rotary core testing clamping device, characterized in that: It includes a screw-in slide (200) and a movable clamping arm (110) and a fixed clamping arm (120) disposed on the screw-in slide (200). The screw-in slide (200) is provided with a transmission screw (204), the fixed clamping arm (120) is fixedly installed on the screw-in slide (200) at one end of the transmission screw (204), and the movable clamping arm (110) is fixed to the sliding end of the transmission screw (204) and is movably installed relative to the fixed clamping arm (120). The movable clamping arm (110) and the fixed clamping arm (120) are provided with coaxially facing core positioning grooves (111). The core positioning groove (111) is provided with an electrode that is in clamping contact with the end face of the core and a conductive sponge that is wetted with a conductive solution. At the lowest point of the core positioning groove (111), there is a drainage hole (113) extending outward from the clamping arm. The drainage hole (113) is connected to the water tank (130).
2. The rotary core testing clamping device according to claim 1, characterized in that: The rotary slide (200) is provided with a movable clamping platform (201) and a fixed clamping platform (202). The movable clamping platform (201) serves as the sliding end of the transmission screw (204), and the movable clamping arm (110) is detachably mounted on the movable clamping platform (201). The fixed clamping platform (202) is fixed on the screw-in slide (200), and the fixed clamping arm (120) is detachably installed on the fixed clamping platform (202).
3. The rotary core testing clamping device according to claim 2, characterized in that: The rotary slide (200) is also provided with a guide rail (203) parallel to the transmission screw (204), and the movable clamping platform (201) and the guide rail (203) are slidably assembled.
4. The rotary core testing clamping device according to claim 2, characterized in that: The movable clamping platform (201) and the transmission screw (204) are connected by ball screw transmission.
5. The rotary core testing clamping device according to claim 4, characterized in that: The transmission screw (204) is equipped with a locking device (205).
6. The rotary core testing clamping device according to claim 5, characterized in that: The end of the transmission screw (204) is provided with a screw-in handle (206) for rotating the transmission screw.
7. The rotary core testing clamping device according to claim 1, characterized in that: The outer sides of the movable clamping arm (110) and the fixed clamping arm (120) are provided with a water tank positioning platform (114) for placing the water tank.
8. The rotary core testing clamping device according to claim 1, characterized in that: The movable clamping arm (110) and the fixed clamping arm (120) are also provided with electrode lead-out holes (112) that communicate with the core positioning groove above them.
9. A rotary core testing clamping device according to claim 2, characterized in that: The rotary slide (200) is also equipped with a scale (208) for detecting the size of the rock core.
10. A rotary core testing clamping device according to claim 9, characterized in that: The movable clamping platform (201) and the scale (208) on the rotary slide (200) constitute a vernier scale.