A small-scale compression-torsion coupled static sounding device

Abstract

The present application relates to in-situ soil detection technology field, especially in a kind of compression-torsion coupling small static sounding equipment.It includes working unit, front end mounting seat, rear end mounting seat and linear power unit, wherein working unit is installed on front end mounting seat and rear end mounting seat, working unit includes special-shaped penetration part, sensor, internal lead screw, nut sleeve and outer sleeve, internal lead screw, nut sleeve and outer sleeve are coaxially nested from inside to outside, nut sleeve and internal lead screw are threadedly engaged to form screw pair, nut sleeve and outer sleeve are connected by key groove to form torsional moving pair, so that nut sleeve realizes linear and torsional coupling movement;Sensor and special-shaped penetration part are sequentially connected to the front end of nut sleeve;Linear power unit is installed on rear end mounting seat, and output end is connected with internal lead screw.The present application realizes the synchronous acquisition of axial force and torque parameters, accurately analyzes geological information, and has the characteristics of miniaturization and integration.

Description

Technical Field

[0001] This invention relates to the field of in-situ soil testing technology, and in particular to a pressure-torsion coupled small static cone penetration test device. Background Technology

[0002] Static cone penetration testing (CPPT) is an important in-situ testing method that uses quasi-static force to uniformly press a sensor-equipped penetrator into the sample under test, measuring the penetration resistance to assess the sample's physical and mechanical properties. This technique can extract core parameters such as cone tip resistance (qc), sidewall friction resistance (fs), and pore medium pressure (μ), which are used to identify sample interfaces, determine sample type, and further determine key indicators such as bearing capacity, internal friction angle, deformation modulus, compression modulus, non-discharge shear strength, consolidation coefficient, permeability coefficient, and liquefaction tendency. This provides data support for pile foundation design, foundation treatment effectiveness verification, and slope stability analysis.

[0003] However, conventional static cone penetration testing (CPPT) technology relies solely on axial penetration parameters for analysis, which has significant limitations: firstly, the interpretation of a single parameter is one-sided and cannot accurately reflect the true situation of complex strata; secondly, traditional drilling methods are prone to missing subtle changes in soil layers, failing to comprehensively capture geological information and posing potential risks to geotechnical engineering design and safety assessment. Furthermore, when the tested sample exhibits special properties such as collapse or viscosity, the penetration testing device is easily jammed, thus affecting other operations of the vehicle; simultaneously, existing equipment is large and heavy, making it difficult to adapt to the carrying requirements of extreme environments such as extraterrestrial exploration and deep-sea exploration, thus limiting its application scope. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a small static cone penetration test device with pressure-torsion coupling, which solves the problems of existing static cone penetration test devices having limited parameter measurement, being susceptible to jamming due to sample properties, and being difficult to adapt to extreme environmental detection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a small static cone penetrometer with pressure-torsion coupling, comprising a working unit, a front mounting base, a rear mounting base, and a linear power unit. The working unit is mounted on the front and rear mounting bases and includes a shaped penetrometer, a sensor, an internal lead screw, a lead screw sleeve, and an outer sleeve. The internal lead screw, lead screw sleeve, and outer sleeve are coaxially nested from the inside out. The lead screw sleeve and the internal lead screw are threaded together to form a helical pair, and the rotation of the internal lead screw drives the lead screw sleeve to perform linear motion. The lead screw sleeve and the outer sleeve are connected by a keyway to form a torsional sliding pair, enabling the lead screw sleeve to achieve coupled linear and torsional motion. The sensor and the shaped penetrometer are sequentially connected to the front end of the lead screw sleeve. The linear power unit is mounted on the rear mounting base, and its output end is connected to the internal lead screw. The linear power unit is used to drive the internal lead screw to rotate.

[0007] The torsional sliding pair includes a cam groove arranged axially on the inner wall of the outer sleeve and a cylindrical key or a rolling bearing arranged on the outer wall of the nut sleeve and slidingly engaged with the cam groove.

[0008] The cam curve groove is formed by alternating horizontal and vertical grooves connected end to end in sequence.

[0009] Two sets of cam curve grooves are symmetrically arranged on the inner wall of the outer sleeve; corresponding to the two sets of cam curve grooves, two cylindrical keys or two rolling bearings are symmetrically arranged on the outer wall of the nut sleeve.

[0010] The irregularly shaped penetration portion is either a conical penetration portion or a cross-shaped penetration portion.

[0011] The outer sleeve and the front mounting base are connected by bearings to form a rotating pair, or are fixed by bolts.

[0012] The front-end mounting base and the rear-end mounting base are fixedly connected to the extraterrestrial satellite exploration vehicle or transport vehicle via shape memory alloy, pyrotechnic cutter or explosive bolt unlocking device.

[0013] The advantages and beneficial effects of this invention are:

[0014] Achieving pressure-torsion coupling motion: This invention, through the precise design of the cam curve groove and the transmission cooperation of the helical pair, enables the irregularly shaped penetration part to perform linear and torsional coupled motion according to the preset motion trajectory, simultaneously collecting axial force and torque parameters. This breaks through the parameter limitations of traditional static penetration testing equipment, accurately analyzes geological information, and avoids the one-sidedness of single parameter interpretation and the risk of missing indicators in traditional drilling.

[0015] Risk of jamming: Through reasonable structural design, this invention effectively isolates the problem of jamming of the probe device caused by the collapse, viscosity or other special properties of the sample being tested, so as to avoid affecting other operations of the carrier and improve the reliability of equipment operation.

[0016] Miniaturization and integration: This invention uses a single power source to drive pressure-torsion coupling motion, which greatly reduces the overall weight and outer envelope size of the equipment, making it possible to mount the equipment on vehicles used in extreme environments such as extraterrestrial exploration rovers and deep-sea probes, thus broadening the application scenarios of the equipment.

[0017] Adaptable to extreme environments: The equipment has a compact structure and high reliability, and can be used for in-situ detection tasks of soil samples from extraterrestrial bodies, deep-sea soil samples, and extreme environments such as vacuum and dust, meeting diverse detection needs.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a front view of a pressure-torsion coupling miniature energy probe device according to the present invention;

[0022] Figure 2 This is a schematic diagram of the working unit in this invention;

[0023] Figure 3 This is a schematic diagram of the irregularly shaped penetration portion in this invention;

[0024] Figure 4 This is a schematic diagram of the outer sleeve structure in this invention;

[0025] Figure 5 This is a simplified diagram of the movement trajectory of the nut sleeve in this invention.

[0026] In the diagram: 1-Working unit; 2-Front end mount; 3-Rear end mount; 4-Linear power unit; 11-Irregularly shaped insertion part; 12-Sensor; 13-Threaded nut sleeve; 14-Outer sleeve; 141-Cam curve groove; 15-Internal lead screw; 16-Cylindrical key; 17-Trapezoidal thread. Detailed Implementation

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] See Figures 1 to 5 As shown, this invention provides a small static cone penetrometer with pressure-torsion coupling, comprising a working unit 1, a front mounting base 2, a rear mounting base 3, and a linear power unit 4. The working unit 1 is mounted on the front mounting base 2 and the rear mounting base 3. The working unit 1 includes a shaped penetrating section 11, a sensor 12, an internal lead screw 15, a lead screw sleeve 13, and an outer sleeve 14. The internal lead screw 15, the lead screw sleeve 13, and the outer sleeve 14 are coaxially nested from the inside out. The lead screw sleeve 13 is threadedly engaged with the internal lead screw 15 to form a screw thread. The joint is specifically a trapezoidal thread 17; when the internal lead screw 15 rotates, it drives the lead screw sleeve 13 to perform linear motion; the lead screw sleeve 13 and the outer sleeve 14 form a torsional sliding joint through a keyway, so that the lead screw sleeve 13 can achieve coupled linear and torsional motion; the sensor 12 and the irregular penetrating part 11 are connected to the front end of the lead screw sleeve 13 in sequence; the linear power unit 4 is installed on the rear mounting base 3 by bolts, and the output end is connected to the internal lead screw 15. The linear power unit 4 is used to drive the internal lead screw 15 to rotate.

[0030] See Figure 4 and Figure 5 As shown, in an embodiment of the present invention, the torsional sliding pair includes a cam groove 141 axially disposed on the inner wall of the outer sleeve 14 and a cylindrical key 16 or a rolling bearing slidably engaged with the cam groove 141 disposed on the outer wall of the nut sleeve 13. When the power of the linear power unit 4 is transmitted to the nut sleeve 13 through the internal lead screw 15, the nut sleeve 13 can move according to the coupling characteristics of the cam groove 141 because the outer side of the nut sleeve 13 engages with the inner side of the outer sleeve 14, thus achieving a pressure-torsional coupling motion mode.

[0031] Furthermore, the cam curve groove 141 is formed by alternating horizontal and vertical grooves connected end to end in sequence. After determining the motion trajectory of the working part, the cam curve groove 141 can be designed according to the calculated torque test depth. In this embodiment, there is a 120° phase difference between two adjacent vertical grooves.

[0032] Preferably, two sets of cam curve grooves 141 are symmetrically arranged on the inner wall of the outer sleeve 14; corresponding to the two sets of cam curve grooves 141, two cylindrical keys 16 or two rolling bearings are symmetrically arranged on the outer wall of the nut sleeve 13.

[0033] Furthermore, the irregularly shaped penetration 11 can be a conical penetration or a cross-shaped penetration. The cross-shaped penetration is more suitable for torque measurement. In this configuration, the torque test results will be more accurate, and it is more suitable for working conditions where the soil resistance itself is not too high.

[0034] Specifically, the irregularly shaped penetration part 11 is fixedly connected to one end of the sensor 12 by bolts, and the other end of the sensor 12 is fixedly connected to the wire sleeve 13 by bolts or any other connection method such as welding or gluing.

[0035] Specifically, the outer sleeve 14 and the front mounting base 2 are connected by bearings to form a rotating pair, or are fixed by bolts. The linear power unit 4 includes a motor, and the output end of the motor is connected to the internal lead screw 15 through transmission methods such as gears, sprockets, pulleys, magnetic wheels, worm gears, friction wheels, cams, universal joints, hydraulic transmissions, or pneumatic transmissions, so as to transmit the power of the servo motor to the internal lead screw 15 and ensure the stability and reliability of power transmission.

[0036] When high axial torque is required and there is sufficient overall weight allowance, the outer sleeve 14 can be allowed greater freedom, enabling it to form a rotating pair with the front mounting base 2 via bearings. This allows the nut sleeve 13 to move linearly along the moving pair of the outer sleeve 14. The outer sleeve 14 can be driven by an external power source to perform torsional motion, thus creating a pressure-torsional coupling motion through two power sources.

[0037] See Figure 5 As shown, the cam curve groove 141 on the outer sleeve 14 is simplified into a broken-line groove path, which can be planned based on the pre-tested axial force and torque positions. The inner lead screw 15 can be simplified into an oblique path; when there are no other restrictions, the mass on the inner lead screw 15 moves along this path. The cylindrical key 16 or rolling bearing provided on the outside of the lead screw sleeve 13 is simplified into a circular mass. Therefore, when the inner lead screw 15 and the outer sleeve 14 move simultaneously, the movement trajectory of the irregularly shaped penetration part 11 is the same as the trajectory of the circular mass in the diagram.

[0038] This invention provides a small static penetrometer with pressure-torsion coupling. The front mounting base 2 and rear mounting base 3 are fixedly connected to an extraterrestrial satellite rover or launch vehicle via a shape memory alloy, pyrotechnic cutter, or explosive bolt unlocking device, ensuring reliable mounting and unlocking of the device under extreme environments. In in-situ testing of Martian soil samples, the device is fixed to the Martian rover via the unlocking device. Upon reaching the testing location, the linear power unit 4 is activated, driving the internal lead screw 15 to rotate. Through the cooperation of the helical pair and the cam curve groove, the irregularly shaped penetrator 11 penetrates the Martian soil in a pressure-torsion coupling manner. The sensor 12 simultaneously collects axial penetration resistance and torsional resistance parameters, providing accurate data support for the analysis of the physical and mechanical properties of the Martian soil.

[0039] This invention provides a small-scale static cone penetration test device with pressure-torsion coupling, which can be used for in-situ testing of soil samples from extraterrestrial bodies, deep-sea soil samples, and other soil samples in vacuum, dust, and other extreme environments. While measuring axial force in situ, it can also measure torsional resistance at various depths, avoiding the limitations of a single parameter. The significant advantage of adding torque measurement during static cone penetration testing lies not only in overcoming the limitations of transmission parameters and accurately analyzing geological information, but also in enabling risk warning and quality control, significantly improving engineering safety and enhancing the efficiency and intelligence of in-situ testing equipment. Furthermore, the miniaturized and integrated design of the device makes its weight and envelope suitable for in-situ measurements in extraterrestrial environments.

[0040] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A compression-shear coupling mini-static cone device, characterized in that, The system includes a working unit (1), a front mounting base (2), a rear mounting base (3), and a linear power unit (4). The working unit (1) is mounted on the front mounting base (2) and the rear mounting base (3). The working unit (1) includes a shaped penetrating part (11), a sensor (12), an internal lead screw (15), a lead screw sleeve (13), and an outer sleeve (14). The internal lead screw (15), the lead screw sleeve (13), and the outer sleeve (14) are coaxially nested from the inside to the outside. The lead screw sleeve (13) and the internal lead screw (15) are threaded together to form a... The screw pair, when the internal lead screw (15) rotates, drives the lead screw sleeve (13) to perform linear motion; the lead screw sleeve (13) and the outer sleeve (14) form a torsional sliding pair through keyway cooperation, so that the lead screw sleeve (13) realizes the coupling motion of linear and torsional motion; the sensor (12) and the irregular penetrating part (11) are connected to the front end of the lead screw sleeve (13) in sequence; the linear power unit (4) is installed on the rear mounting base (3), and the output end is connected to the internal lead screw (15). The linear power unit (4) is used to drive the internal lead screw (15) to rotate. The torsional sliding pair includes a cam curve groove (141) axially disposed on the inner wall of the outer sleeve (14) and a cylindrical key (16) or a rolling bearing that is slidably engaged with the cam curve groove (141) disposed on the outer wall of the nut sleeve (13). The cam curve groove (141) is formed by alternating horizontal and vertical grooves connected end to end in sequence; The front mounting base (2) and the rear mounting base (3) are fixedly connected to the extraterrestrial satellite exploration vehicle or vehicle by a shape memory alloy, a pyrotechnic cutter or an explosive bolt unlocking device.

2. The compression-torsion coupling mini-static penetrometer apparatus according to claim 1, wherein, Two sets of cam curve grooves (141) are symmetrically arranged on the inner wall of the outer sleeve (14); corresponding to the two sets of cam curve grooves (141), two cylindrical keys (16) or two rolling bearings are symmetrically arranged on the outer wall of the nut sleeve (13).

3. The compression-torsion coupling mini-static penetrometer apparatus according to claim 1, wherein, The irregularly shaped penetration (11) is a conical penetration or a cross-shaped penetration.

4. The pressure-torsion coupling miniature static cone penetration test device according to claim 1, characterized in that, The outer sleeve (14) and the front mounting base (2) are connected by bearings to form a rotating pair, or are fixed by bolts.

Images