A vane shear test system

Abstract

This invention discloses a vane shear test system, improving upon the technical problem of poor test accuracy. The device includes a drive unit, a torque sensor, a shaft, and a vane head connected sequentially from top to bottom. It also includes a support sleeve, with its top end fixed to the drive unit and its bottom end rotatably connected to the vane head, and the shaft rotatably disposed within the support sleeve; and a limiting member disposed on the support sleeve. The limiting member can be fixed to the borehole wall of a seabed borehole to support and limit the shaft. This invention can support and limit the shaft, reducing the risk of shaft vibration, thereby reducing the risk of vane head vibration. This allows the vane head to form a regular cylindrical failure surface during soil rotation, thus improving the test accuracy of the system.

Description

Technical Field

[0001] This invention belongs to the technical field of in-situ testing systems, specifically relating to a vane shear test system. Background Technology

[0002] The vane in-situ testing system is a field test for the undrained shear strength of saturated clay, and is one of the most important in-situ testing methods in marine engineering geological exploration. The marine in-situ vane shear test involves applying torque to a vane head inserted into the clay at the bottom of a borehole drilled on the seabed, causing the vane head to twist uniformly in the soil, forming a cylindrical failure surface. The test then calculates and evaluates the undrained shear strength of the clay and its sensitivity, among other indicators.

[0003] The test system in the relevant technology usually includes a drive device, a shaft, a torque sensor and a vane head connected in sequence from top to bottom. The drive device applies torque to the shaft, which drives the vane head to rotate. At this time, the torque sensor measures the torsional torque of the vane head and records the relationship between the measured torque value and the rotation angle in real time, thereby realizing the shear strength test of saturated clay.

[0004] However, in deep-water engineering geological exploration operations, in order to achieve deep-water operations, the shaft is usually quite long. During the process of controlling the rotation of the shaft using the drive device, the shaft will experience lateral vibration due to factors such as seawater and its own inertial force. This causes the crosshead to vibrate, making it difficult for the crosshead to form a regular cylindrical failure surface during the rotation of the soil, thus affecting the accuracy of the test and requiring improvement. Summary of the Invention

[0005] To address all or some of the aforementioned problems, the present invention aims to provide a vane shear test system that can reduce the risk of shaft vibration, thereby reducing the risk of vane head vibration, and enabling the vane head to form a regular cylindrical failure surface during soil rotation, thus improving test accuracy.

[0006] This invention provides a vane shear testing system, comprising a drive unit, a torque sensor, a shaft, and a vane head connected sequentially from top to bottom, and further comprising: The support sleeve has its top end fixed to the driving device and its bottom end rotatably connected to the cross plate head, and the shaft is rotatably disposed inside the support sleeve. A limiting element is provided on the support sleeve; The limiting member can be fixed to the borehole wall of the seabed borehole to support and limit the shaft.

[0007] Optionally, the limiting member includes at least one set of limiting plates, each set of limiting plates being arranged along the circumferential direction of the support sleeve. The width of the limiting plate is greater than the width of the crosshead, and the limiting plate can be inserted into the wall of the seabed borehole.

[0008] Optionally, the bottom of the limiting plate is provided with a first guide slope.

[0009] Optionally, the top of the limiting plate is provided with a second guide slope.

[0010] Optionally, the support sleeve includes a transition joint, a support cylinder, and a front end bushing arranged sequentially from top to bottom. The top end of the support cylinder is threadedly connected to the front end bushing, and the bottom end is threadedly connected to the front end bushing. The transition joint is threadedly connected to the drive device. The front end bushing is rotatably connected to the rotating shaft of the crosshead. The limiting member is at least provided on the support cylinder.

[0011] Optionally, the shaft includes an extension rod and a connecting rod, the connecting rod being coaxially connected to the top end of the extension rod, the bottom end of the extension rod being coaxially connected to the rotation axis of the crosshead, and the top end being coaxially connected to the output shaft of the drive device.

[0012] Optionally, the driving device includes: The supporting shell serves a supporting function; A drive unit is disposed within the support housing and is used to provide power; The drive shaft is rotatably connected inside the support housing; One end of the torque sensor is connected to the output shaft of the drive unit, and the other end is connected to the top end of the drive shaft, while the bottom end of the drive shaft is coaxially connected to the shaft rod.

[0013] Optionally, the bottom of the support shell is provided with a guide bearing seat, the bottom of the drive shaft is rotatably connected to the guide bearing seat, and the top end of the support sleeve is fixed to the guide bearing seat.

[0014] Optionally, a sealing cover is provided between the support sleeve and the guide bearing seat, and the bottom end of the drive shaft passes through the sealing cover and is connected to the shaft rod.

[0015] As can be seen from the above technical solution, the vane shear test system provided by the present invention has the following advantages: This device can support and limit the shaft, thereby reducing the risk of shaft vibration and thus reducing the risk of crosshead vibration. It enables the crosshead to form a regular cylindrical failure surface during soil rotation, thereby improving the testing accuracy of the test system.

[0016] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a cross-sectional view of an embodiment of the present invention; Figure 3 This is a schematic diagram of the support sleeve in an embodiment of the present invention; Figure 4 This is a top view of the support sleeve in an embodiment of the present invention; Figure 5 for Figure 2 Enlarged view of region A in the middle; Figure 6 for Figure 2 Enlarged schematic diagram of region B in the middle.

[0019] Explanation of reference numerals in the attached figures: 1. Drive unit; 11. Support housing; 12. Drive unit; 13. Drive shaft; 14. Guide bearing seat; 15. Sealing cover; 2. Shaft; 21. Extension rod; 22. Connecting rod; 3. Torque sensor; 4. Cross plate head; 5. Support sleeve; 51. Transition joint; 52. Support cylinder; 53. Front bushing; 6. Limiting component; 61. Limiting plate; 62. First guide slope; 63. Second guide slope. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The figure shown is an embodiment of the present invention. This embodiment discloses a vane shear test system, which includes a drive device 1, a torque sensor 3, a shaft 2 and a vane head 4 connected in sequence from top to bottom. It also includes a vertically arranged support sleeve 5. The top end of the support sleeve 5 is fixed to the drive device 1 and the bottom end is rotatably connected to the vane head 4. At the same time, the shaft 2 is rotatably arranged inside the support sleeve 5.

[0022] In one embodiment, such as Figure 2 , Figure 3 As shown, a limiting member 6 is provided on the support sleeve 5. When the cross plate head 4 is lowered into the seabed borehole, the limiting member 6 can be fixed to the borehole wall of the seabed borehole to achieve support and limiting of the shaft 2.

[0023] In this embodiment, the vane shear test system uses an additional support sleeve 5 on the outside of the shaft 2, with a limiting member 6 on the support sleeve 5 that can be fixed to the borehole wall of the seabed drill hole, to support and limit the shaft 2. This design reduces the risk of vibration of the shaft 2, thereby reducing the risk of vibration of the vane head 4, allowing the vane head 4 to form a regular cylindrical failure surface during soil rotation, thus improving the testing accuracy of the system.

[0024] In one embodiment, such as Figure 3 , Figure 4 As shown, the limiting member 6 includes at least one set of limiting plates 61. Each set of limiting plates 61 is arranged along the circumferential direction of the support sleeve 5. The width of the limiting plate 61 is greater than the width of the cross head 4, and the limiting plate 61 can penetrate into the hole wall of the seabed borehole.

[0025] When the test system is deployed and the crosshead 4 enters the seabed borehole, multiple limiting plates 61 are inserted into the borehole wall, thereby achieving the locking and fixing of the limiting plates 61 with the borehole wall, and thus fixing the limiting plates 61 with the borehole wall.

[0026] In this embodiment, a set of six limiting plates 61 are provided, and the six limiting plates 61 are evenly distributed at 60° intervals. The limiting plates 61 are located in the middle of the support sleeve 5. Of course, in other embodiments, multiple sets of limiting plates 61 can be provided, with each set containing four or eight plates, and the limiting plates 61 can also be located at both ends of the support sleeve 5 or other positions; these are not listed here.

[0027] In one embodiment, such as Figure 2 , Figure 3 As shown, the bottom of the limiting plate 61 is integrally formed with a first guide slope 62 to improve the guiding effect, so that the limiting plate 61 can stably penetrate the hole wall of the seabed borehole. At the same time, the top of the limiting plate 61 is integrally formed with a second guide slope 63 to improve the guiding effect, so that the limiting plate 61 can be smoothly withdrawn from the seabed borehole, thereby improving the smoothness of the test system's movement.

[0028] In one embodiment, such as Figure 2 , Figure 5 , Figure 6As shown, the support sleeve 5 includes a transition joint 51, a support cylinder 52, and a front bushing 53 arranged sequentially from top to bottom. The top end of the support cylinder 52 is threadedly connected to the transition joint 51, and the bottom end is threadedly connected to the front bushing 53. The transition joint 51 is threadedly connected to the drive device 1, and the front bushing 53 is rotatably connected to the rotating shaft of the crosshead 4. In this embodiment, the limiting plate 61 is integrally formed and fixed on the support cylinder 52. In other embodiments, the limiting plate 61 can also be segmented, that is, a part of the limiting plate 61 is fixed on the support cylinder 52, and the rest is fixed on the transition joint 51 and the front bushing 53.

[0029] In one embodiment, such as Figure 2 , Figure 5 , Figure 6 As shown, the shaft 2 includes an extension rod 21 and a connecting rod 22. The connecting rod 22 is coaxially connected to the top end of the extension rod 21. The bottom end of the extension rod 21 is coaxially fixedly connected to the rotation shaft of the cross plate head 4, and the top end is coaxially fixedly connected to the output shaft of the drive device 1.

[0030] In one embodiment, such as Figure 2 , Figure 6 As shown, the drive device 1 includes a support housing 11, within which a drive unit 12 is disposed, and the drive unit 12 provides power for the rotation of the connecting rod 22. A drive shaft 13 is disposed within the support housing 11. One end of the torque sensor 3 is fixedly connected to the output shaft of the drive unit 12, and the other end is fixedly connected to the top end of the drive shaft 13. Simultaneously, the bottom end of the drive shaft 13 is coaxially fixedly connected to the connecting rod 22.

[0031] In one embodiment, such as Figure 2 , Figure 6 As shown, a guide bearing seat 14 is fixedly connected to the bottom of the support shell 11, and the bottom of the drive shaft 13 is rotatably connected to the guide bearing seat 14. A transition joint 51 is sleeved on the guide bearing seat 14 and threadedly connected to it. Meanwhile, a sealing cover 15 is provided between the transition joint 51 and the guide bearing seat 14. The bottom end of the drive shaft 13 passes through the sealing cover 15 and connects to the connecting rod 22 to improve the sealing effect.

[0032] The torque sensor 3 and the drive shaft 13 are rotated by the drive unit 12, and then the drive shaft 13 drives the connecting rod 22 to rotate the extension rod 21 and the cross head 4. In this embodiment, the drive unit 12 can be a servo motor, a plunger pump motor, or other motor structure consisting of a motor and a reducer, as long as it can achieve stable rotation of the drive shaft 13.

[0033] In this embodiment, the vane shear test system features an additional support sleeve 5 on the outer side of the shaft 2. The support sleeve 5 has a limiting member 6 that can be fixed to the borehole wall of the seabed borehole. As the shaft 2 rotates, the support sleeve 5 remains stationary, providing support and limiting for the shaft 2. This design reduces the risk of vibration in the shaft 2, thereby reducing the risk of vibration in the vane head 4. This allows the vane head 4 to form a regular cylindrical failure surface during soil rotation, thus improving the testing accuracy of the system.

[0034] Meanwhile, the shaft 2 rotates inside the support sleeve 5, which can isolate seawater and other external factors from the shaft 2, reducing friction or other interference. The measured value of the torque sensor 3 can be almost determined as the actual value of the crosshead 4, thereby improving the accuracy of the test.

[0035] Furthermore, the drive unit 12, torque sensor 3, and shaft 2 are designed to be concealed, with only the crosshead 4 exposed. This reduces the interference of external factors on the drive unit 12, shaft 2, and torque sensor 3, thereby improving the accuracy of the test.

[0036] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A vane shear test system, comprising a drive device (1), a torque sensor (3), a shaft (2), and a vane head (4) connected sequentially from top to bottom, characterized in that, Also includes: The support sleeve (5) is fixed at the top end to the drive device (1) and rotatably connected to the cross plate head (4) at the bottom end, and the shaft (2) is rotatably disposed inside the support sleeve (5); A limiting element (6) is provided on the support sleeve (5); The limiting member (6) can be fixed to the wall of the seabed borehole to support and limit the shaft (2); The limiting member (6) includes at least one set of limiting plates (61), each set of limiting plates (61) is arranged along the circumferential direction of the support sleeve (5), the width of the limiting plate (61) is greater than the width of the cross plate head (4), and the limiting plate (61) can be inserted into the hole wall of the seabed borehole. The bottom of the limiting plate (61) is provided with a first guide slope (62); The top of the limiting plate (61) is provided with a second guide slope (63); The support sleeve (5) includes a transition joint (51), a support cylinder (52) and a front bushing (53) arranged sequentially from top to bottom. The top end of the support cylinder (52) is threaded to the transition joint (51) and the bottom end is threaded to the front bushing (53). The transition joint (51) is threaded to the drive device (1). The front bushing (53) is rotatably connected to the rotating shaft of the cross head (4). The limiting member (6) is at least provided on the support cylinder (52). The shaft (2) rotates within the support sleeve (5), which can isolate seawater and other external factors to reduce friction or other interference to the shaft (2), so that the measured value of the torque sensor (3) is equal to the actual value of the crosshead (4).

2. The vane shear test system according to claim 1, characterized in that, The shaft (2) includes an extension rod (21) and a connecting rod (22). The connecting rod (22) is coaxially connected to the top end of the extension rod (21). The bottom end of the extension rod (21) is coaxially connected to the rotation axis of the crosshead (4), and the top end is coaxially connected to the output shaft of the drive device (1).

3. The vane shear test system according to claim 1, characterized in that, The driving device (1) includes: The supporting shell (11) serves a supporting function; A drive unit (12) is disposed inside the support shell (11) and is used to provide power; The drive shaft (13) is rotatably connected to the support shell (11); One end of the torque sensor (3) is connected to the output shaft of the drive unit (12), and the other end is connected to the top end of the drive shaft (13), and the bottom end of the drive shaft (13) is coaxially connected to the shaft (2).

4. The vane shear test system according to claim 3, characterized in that, The bottom of the support shell (11) is provided with a guide bearing seat (14), the bottom of the drive shaft (13) is rotatably connected to the guide bearing seat (14), and the top end of the support sleeve (5) is fixed to the guide bearing seat (14).

5. The vane shear test system according to claim 4, characterized in that, A sealing cover (15) is provided between the support sleeve (5) and the guide bearing seat (14), and the bottom end of the drive shaft (13) passes through the sealing cover (15) and is connected to the shaft (2).

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