Soil sample cutting instrument for soil test

Abstract

The invention provides a soil sample cutting instrument for a soil test, which comprises a sample cutting box, and a soil sample cutting connection module, a lifting moving module and a fixed box body are arranged in the sample cutting box; a soil sample cutting head connecting sleeve in the soil sample cutting connecting module penetrates through a connecting groove and is locked with a soil sample cutting head; the moving modules are arranged on two sides of the soil sample cutting connecting module and are connected with the soil sample cutting connecting module; the fixed box body is used for installing the soil sample cutting connecting module, the soil sample cutting connecting module and the fixed box body are composed of a steel frame and an external sample cutting box plate, and the lifting moving module is connected with the fixed box body; a control screen is arranged on the fixed box body, a control unit is arranged in the control screen, and the control unit is connected with the soil sample cutting connection module and the lifting movement module; the bottom supporting and moving assembly is connected with a bottom box plate of the sample cutting box. The soil sample cutting instrument for the soil test can adapt to different working environments, and the test efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of soil sampling, and in particular relates to a soil sample cutting instrument for geotechnical tests. Background Art

[0002] A soil sample cutter is a device used to prepare standard soil samples for geotechnical testing. It cuts soil samples into the desired size and shape for various geomechanical tests. Geotechnical testing is a crucial component of engineering geological investigations, providing reliable indicators of soil physical and mechanical properties for studying soil deformation mechanisms and engineering geological properties in engineering design and engineering geological investigations. Therefore, the design and use of a soil sample cutter directly impacts soil sample quality and the reliability of test results. Practical operation requires consideration of multiple aspects to ensure that the cut soil sample meets test requirements.

[0003] At present, soil sample cutting instruments are affected by the external environment to varying degrees, resulting in increased pressure on the cutter, slower cutting speed, longer test time, easy damage to the equipment, and the need for frequent adjustments to the cutter design and cutting parameters. The operation is complicated and can easily lead to inconsistent test results. Summary of the Invention

[0004] In view of this, the present invention aims to propose a soil sample cutter for geotechnical tests to solve the problem that the soil sample cutter may be affected by the external environment to varying degrees, resulting in increased pressure on the cutter, slower cutting speed, longer test time, easy damage to the equipment, and the cutter design and cutting parameters need to be frequently adjusted, which makes the operation complicated and easily leads to inconsistent test results.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: The present invention provides a soil sample cutting instrument for geotechnical testing, comprising a cutting box for performing soil sample cutting, wherein the cutting box is provided with a soil sample cutting connection module, a lifting and moving module and a fixed box body; the soil sample cutting connection module is used in the soil sample cutting process, wherein a soil sample cutting head connecting sleeve connected to a second servo motor in the soil sample cutting connection module is provided with a plurality of connecting grooves on its side, and bolts pass through the connecting grooves and are locked with the soil sample cutting head; a moving module, comprising a lifting and moving module and a front and rear moving module, which are provided on both sides of the soil sample cutting connection module and are connected to the soil sample cutting connection module. The sample cutting connection module is connected by bolts, and several photoelectric sensors are provided on the mobile module for limiting the movement process; the fixed box is used to install the soil sample cutting connection module and the soil sample cutting connection module, and the fixed box is composed of a steel frame and an external cutting box plate. The lifting and moving module is connected to the fixed box, and a control panel is provided on the fixed box. The control panel is equipped with a control unit, which is connected to the soil sample cutting connection module and the lifting and moving module, and is used to control the soil sample cutter to perform cutting action; the bottom support moving assembly is connected to the bottom box plate of the cutting box.

[0006] Furthermore, in the soil sample cutting connection module, the second servo motor is fixed to the motor pad through a reducer, the motor pad is locked with the torque sensor, and the lower part of the torque sensor is fixed on the torque sensor fixing seat, the torque sensor fixing seat is locked on the second servo motor support plate, the torque sensor is used to detect the real-time torque value of the second servo motor, the shaft head of the second servo motor is connected to the connecting shaft through the second coupling, the connecting shaft is connected to the upper joint in the soil sample cutting head connecting sleeve, the soil sample cutting head is threadedly connected at the upper joint, the top of the annular pressure sensor fixing part and the top of the first pressure sensor are locked with the second servo motor support plate, and the bottom fixing ring of the annular pressure sensor fixing part shaped pressure sensor, the bottom of the first pressure sensor is connected to the bearing connector, the bearing connector is connected to the connecting shaft through the bearing assembly, the annular pressure sensor is fixed to the connecting flange of the soil sample cutting head connecting sleeve, the annular pressure sensor is used to monitor the real-time radial pressure of the soil sample cutting head connecting sleeve, the first pressure sensor is used to transmit the real-time axial pressure of the second servo motor, the motor support side plates are locked on the left and right sides of the second servo motor support plate, the rib plates are locked on the front and rear sides of the second servo motor support plate, the second motor encoder is arranged on the second servo motor, and the second motor encoder is connected to the annular pressure sensor, the torque sensor, and the first pressure sensor.

[0007] Furthermore, the lifting and moving module includes a first slider driving mechanism located on the left and a first linear slide located on the right, the first slider driving mechanism including a first servo motor, a first slider, a first slider driving mechanism, a first photoelectric sensor, a third photoelectric sensor, a second photoelectric sensor and a first external sensing piece, the second slider is slidably fixed on the first linear slide, the first servo motor is arranged at the top of the first slider driving mechanism, the first slider is slidably fixed on the first slider driving mechanism, the first slider driving mechanism is sequentially provided with a first photoelectric sensor, a third photoelectric sensor and a second photoelectric sensor from top to bottom, the first external sensing piece is fixed on the side of the first slider, the first photoelectric sensor, the third photoelectric sensor and the second photoelectric sensor are all connected to the first motor encoder of the first servo motor, the first slider and the motor support side plate are symmetrically arranged about the center line of the cutting box, the symmetrically arranged first slider and second slider are both connected to the motor support side plate, the first linear slide is fixed to the second linear slide through the fourth slider, and the first slider driving mechanism is fixed to the second slider driving mechanism through the third slider.

[0008] Furthermore, the forward and backward moving module includes a second slider driving mechanism located on the left and a second linear slide rail located on the right. The second slider driving mechanism includes a fifth photoelectric sensor, a third servo motor, a sixth photoelectric sensor, a fourth photoelectric sensor, a second external sensing piece, a third slider, and a third motor encoder. The fourth slider is slidably fixed on the second linear slide rail. The third servo motor is arranged on the second slider driving mechanism. The third slider is slidably fixed on the second slider driving mechanism. The second slider driving mechanism is provided with a fourth photoelectric sensor, a fifth photoelectric sensor, and a sixth photoelectric sensor from left to right in sequence. The second external sensing piece is fixed on the side of the third slider. The fourth photoelectric sensor, the fifth photoelectric sensor, and the sixth photoelectric sensor are all connected to the first motor encoder of the third servo motor. The third slider and the fourth slider are symmetrically arranged about the center line of the sample cutting box. The second slider driving mechanism and the fourth slider are both locked and fixed to the steel frame in the box.

[0009] Furthermore, the fixed box body is composed of a steel frame composed of several steel sections, and the cutting box panel is fixed on the periphery of the steel sections. The handle and the control screen are arranged on the cutting box door panel of the cutting box. The control screen is provided with a display screen and several buttons. The control screen is connected to the first photoelectric sensor, the third photoelectric sensor, the second photoelectric sensor, the third servo motor, the sixth photoelectric sensor, the fourth photoelectric sensor, the first motor encoder, the second motor encoder, the third motor encoder, the torque sensor, the annular pressure sensor, and the first pressure sensor. The buttons are connected to the first motor encoder, the second motor encoder, and the third motor encoder. The steel section connections of the steel frame are reinforced with angle codes, and the angle codes are L-shaped.

[0010] Furthermore, the bottom supporting moving assembly includes a Forma wheel, a bottom rectangular fixed frame, a lower connecting flange, a steel cylinder, a connecting plate, an upper connecting flange, and a sample placement table. The lower end of the steel cylinder is bolted to the upper connecting flange and the lower end is connected to the lower connecting flange. The upper connecting flange is locked to the connecting plate. The sample cutting box is fixed on the connecting plate. A sample placement table is provided in the middle of the connecting plate. A gravity sensor is provided on the sample placement table. The gravity sensor is used to detect the actual weight of the sample soil. The gravity sensor is connected to the first servo motor. The lower connecting flange is connected to the bottom rectangular fixed frame by bolts. Pads are provided at the four corners of the bottom surface of the bottom rectangular fixed frame. The Forma wheel is locked to the bottom rectangular fixed frame by bolts passing through the pads.

[0011] Furthermore, a cutting action control unit is provided in the control unit, and the cutting action control unit is provided with a cutting torque preset range for the second servo motor. When performing the soil sample cutting action, if the real-time torque value of the second servo motor is greater than or equal to the maximum value of the cutting torque preset range, the cutting action control unit immediately stops the operation of the second servo motor and records the real-time torque value and the stop time.

[0012] Furthermore, a pressure range threshold is set in the sample cutting action control unit, and the pressure range threshold is related to the type and moisture content of the soil sample. There are three pressure range thresholds, including a low pressure range threshold, a medium pressure range threshold and a high pressure range threshold. When the soil sample cutting action is performed, the real-time sample cutting pressure is detected according to the real-time radial pressure and real-time axial pressure according to the selected pressure range threshold. When any one of the real-time radial pressure and the real-time axial pressure is greater than or equal to the maximum value of any selected pressure range threshold, the sample cutting action control unit immediately stops the operation of the second servo motor and records the real-time sample cutting pressure and the stop time.

[0013] Furthermore, the low pressure maximum threshold of the low pressure range threshold is the same as the medium pressure minimum threshold of the medium pressure range threshold, and the high pressure minimum threshold of the high pressure range threshold is the same as the medium pressure maximum threshold of the medium pressure range threshold.

[0014] Furthermore, when the second servo motor stops running, the sample cutting action control unit drives the first servo motor and the third servo motor to move, so that the soil sample cutting connection module is lifted to the vertical initial position and the horizontal initial position. The vertical initial position is that the first external sensing piece is in the middle position of the first photoelectric sensor and the third photoelectric sensor, and the horizontal initial position is that the second external sensing piece is in the middle position of the fourth photoelectric sensor and the fifth photoelectric sensor.

[0015] Compared with the prior art, the soil sample cutting instrument for geotechnical testing described in the present invention has the following advantages: The soil sample cutter for geotechnical testing described in this invention precisely controls the movement of the cutting head and the cutting depth, ensuring accurate and consistent cutting of each sample, thus improving the reliability of test results. Real-time pressure monitoring during the cutting process and position limit protection prevent overload and equipment damage, ensuring operator and equipment safety. Automated control and data recording reduce manual intervention, improve test efficiency, and shorten test time.

[0016] The soil sample cutter of this invention features a flexible overall design that can adapt to different soil samples and test requirements, enhancing the device's versatility and adaptability. The bottom support assembly provides support, ensuring the stability and mobility of the sample cutter box. A steel cylinder secures the sample cutter box, ensuring stability during operation. A formwork wheel allows for easy movement of the sample cutter box, facilitating operation from various locations and enhancing the device's flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] In the attached figure: Figure 1 This is an axial schematic diagram of a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 2 This is a schematic front view of a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 3 Schematic top view of a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 4 This is a schematic front view of a sample cutting box of a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 5 This is an enlarged schematic diagram of point A in the main view of the sample cutting box of the soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 6 This is a schematic diagram of an enlarged view of point B in the main view of the sample cutting box of the soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 7 A schematic side view of a sample cutting box of a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 8 This is a schematic axial view of a mobile module of a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 9 This is a schematic front view of a mobile module in a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 10This is a schematic cross-sectional view at AA in the main view of the mobile module of the soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 11 This is an axonometric diagram of a soil sample cutting connection module in a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 12 This is a schematic front view of a soil sample cutting connection module in a soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention; Figure 13 This is a cross-sectional schematic diagram at point BB in the main view of the soil sample cutting connection module in the soil sample cutting instrument for geotechnical testing according to an embodiment of the present invention.

[0019] Description of reference numerals: 1. Forma wheel; 2. Bottom rectangular fixing frame; 3. Lower connecting flange; 4. Steel cylinder; 5. Connecting plate; 6. Sample cutting box; 7. Sample cutting box door panel; 8. Handle; 9. First servo motor; 10. Rib plate; 11. Second servo motor; 12. First slider; 13. Motor support side plate; 14. First linear slide; 15. First slider drive mechanism; 16. Soil sample cutting head connecting sleeve; 17. Annular pressure sensor fixing piece; 18. Second servo motor support plate; 19. Washer; 20. Upper connecting flange; 21. First photoelectric sensor; 22. Second photoelectric sensor; 23. Third photoelectric sensor; 24. First external sensor; 2 5. Steel frame; 26. Sample placement table; 27. Angle code; 28. Annular pressure sensor; 29. Torque sensor; 30. Motor pad; 31. Torque sensor fixing seat; 32. Fifth photoelectric sensor; 33. Third servo motor; 34. Sixth photoelectric sensor; 35. Fourth photoelectric sensor; 36. Second external sensor plate; 37. Third slider; 38. Second slider drive mechanism; 39. Second linear slide; 40. Control panel; 42. Fourth slider; 43. Second slider; 44. First pressure sensor; 45. Upper joint; 46. Connecting shaft; 47. Second coupling; 48. Bearing connector; 49. Gravity sensor. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] See Figures 1-13 As shown, this embodiment provides a soil sample cutting instrument for geotechnical testing, including a cutting box 6, which is used for performing soil sample cutting. The cutting box 6 is provided with a soil sample cutting connection module, a lifting and moving module and a fixed box body; the soil sample cutting connection module is used for the soil sample cutting process, and the side of the soil sample cutting head connecting sleeve 16 connected to the second servo motor 11 in the soil sample cutting connection module is provided with a plurality of connecting grooves, and the bolts pass through the connecting grooves and are locked with the soil sample cutting head; the moving module includes a lifting and moving module and a front and rear moving module, which are provided on both sides of the soil sample cutting connection module. , and is connected to the soil sample cutting connection module by bolts. Several photoelectric sensors are provided on the mobile module for limiting the movement process; a fixed box body, which is used to install the soil sample cutting connection module and the soil sample cutting connection module. The fixed box body is composed of a steel frame 25 and an external cutting box board. The lifting and moving module and the fixed box body are provided with a control panel 40 on the fixed box body. The control panel 40 is equipped with a control unit, which is connected to the soil sample cutting connection module and the lifting and moving module, and is used to control the soil sample cutting instrument to perform cutting action; the bottom supports the moving assembly, which is connected to the bottom box board of the cutting box 6.

[0025] Specifically, in the present embodiment, in the soil sample cutting connection module, the second servo motor 11 is fixed on the motor pad 30 through the reducer, the motor pad 30 is locked with the torque sensor 29, and the lower part of the torque sensor 29 is fixed on the torque sensor fixing seat 31, the torque sensor fixing seat 31 is locked on the second servo motor support plate 18, the torque sensor 29 is used to detect the real-time torque value of the second servo motor 11, the shaft head of the second servo motor 11 is connected to the connecting shaft 46 through the second coupling 47, the connecting shaft 46 is connected to the upper joint 45 in the soil sample cutting head connecting sleeve 16, the upper joint 45 is threadedly connected to the soil sample cutting head, the top of the annular pressure sensor fixing part 17 and the top of the first pressure sensor 44 are both locked with the second servo motor support plate 18, the annular pressure sensor An annular pressure sensor 28 is fixed at the bottom of the fixing member 17, and the bottom of the first pressure sensor 44 is connected to the bearing connector 48. The bearing connector 48 is connected to the connecting shaft 46 through a bearing assembly. The annular pressure sensor 28 is fixed to the connecting flange of the soil sample cutting head connecting sleeve 16. The annular pressure sensor 28 is used to monitor the real-time radial pressure of the soil sample cutting head connecting sleeve. The first pressure sensor 44 is used for the real-time axial pressure transmitted by the second servo motor. The motor support side plate 13 is locked on the left and right sides of the second servo motor support plate 18, and the rib plate 10 is locked on the front and rear sides of the second servo motor support plate 18. The second motor encoder is arranged on the second servo motor 11, and the second motor encoder is tightly connected to the annular pressure sensor 28, the torque sensor 29, and the first pressure sensor 44.

[0026] Specifically, in this embodiment, the lifting and moving module includes a first slider driving mechanism 15 located on the left and a first linear slide 14 located on the right. The first slider driving mechanism 15 includes a first servo motor 9, a first slider 12, a first slider driving mechanism 15, a first photoelectric sensor 21, a third photoelectric sensor 23, a second photoelectric sensor 22, and a first external sensor 24. The second slider 43 is slidably fixed on the first linear slide 14. The first servo motor 9 is provided at the top of the first slider driving mechanism 15. The first slider 12 is slidably fixed on the first slider driving mechanism 15. The first slider driving mechanism 15 is provided with a first photoelectric sensor 21, a third photoelectric sensor 23, a second photoelectric sensor 22, and a first external sensor 24. Sensor 21, third photoelectric sensor 23, second photoelectric sensor 22, a first external sensing piece 24 is fixed on the side of the first slider 12, the first photoelectric sensor 21, the third photoelectric sensor 23, and the second photoelectric sensor 22 are all connected to the first motor encoder of the first servo motor 9, the first slider 12 and the motor support side plate 13 are symmetrically arranged about the center line of the cutting box 6, the symmetrically arranged first slider 12 and second slider 43 are both connected to the motor support side plate 13, the first linear slide 14 is fixed to the second linear slide 39 through the fourth slider 42, and the first slider drive mechanism 15 is fixed to the second slider drive mechanism 38 through the third slider 37.

[0027] Specifically, in this embodiment, the forward and backward movement module includes a second slider driving mechanism 38 located on the left and a second linear slide 39 located on the right. The second slider driving mechanism 38 includes a fifth photoelectric sensor 32, a third servo motor 33, a sixth photoelectric sensor 34, a fourth photoelectric sensor 35, a second external sensor plate 36, a third slider 37, and a third motor encoder. The fourth slider 42 is slidably fixed on the second linear slide 39. The third servo motor 33 is provided on the second slider driving mechanism 38. The third slider 37 is slidably fixed on the second slider driving mechanism 38. The second slider driving mechanism 38 is provided with the fourth photoelectric sensor 35, the fifth photoelectric sensor 32, and the sixth photoelectric sensor 34 from left to right. The second external sensor plate 36 is fixed on the side of the third slider 37. The fourth photoelectric sensor 35, the fifth photoelectric sensor 32, and the sixth photoelectric sensor 34 are all connected to the first motor encoder of the third servo motor 33. The third slider 37 and the fourth slider 42 are symmetrically arranged about the center line of the sample cutting box 6. The second slider driving mechanism 38 and the fourth slider 42 are both locked and fixed to the steel frame 25 in the box.

[0028] Specifically, in this embodiment, the fixed box body is composed of a steel frame 25 composed of several steel sections, and the cutting box panel is fixed on the periphery of the steel sections. The handle 8 and the control screen 40 are arranged on the cutting box door panel 7 of the cutting box 6. The control screen 40 is provided with a display screen and several buttons. The control screen 40 is connected to the first photoelectric sensor 21, the third photoelectric sensor 23, the second photoelectric sensor 22, the third servo motor 33, the sixth photoelectric sensor 34, the fourth photoelectric sensor 35, the first motor encoder, the second motor encoder, the third motor encoder, the torque sensor 29, the annular pressure sensor 28, and the first pressure sensor 44. The buttons are connected to the first motor encoder, the second motor encoder, and the third motor encoder. The steel section connections of the steel frame 25 are reinforced with angle codes 27, and the angle code 27 is L-shaped.

[0029] Specifically, in this embodiment, the bottom supporting moving assembly includes a Formosa wheel 1, a bottom rectangular fixed frame 2, a lower connecting flange 3, a steel cylinder 4, a connecting plate 5, an upper connecting flange 20, and a sample placement table 26. The lower end of the steel cylinder 4 is bolted to the upper connecting flange 20, and the lower end is connected to the lower connecting flange 3. The upper connecting flange 20 is locked to the connecting plate 5. The cutting box 6 is fixed on the connecting plate 5. A sample placement table 26 is provided in the middle of the connecting plate 5, and a gravity sensor 49 is provided on the sample placement table 26; the gravity sensor 49 is used to detect the actual weight of the sample soil. The gravity sensor 49 is connected to the first servo motor 9. The lower connecting flange 3 is connected to the bottom rectangular fixed frame 2 by bolts. Pads are provided at the four corners of the bottom surface of the bottom rectangular fixed frame 2. The Formosa wheel 1 is locked to the bottom rectangular fixed frame 2 by bolts passing through the pads.

[0030] Specifically, in this embodiment, a cutting action control unit is provided in the control unit, and the cutting action control unit is provided with a cutting torque preset range for the second servo motor. When performing the soil sample cutting action, if the real-time torque value of the second servo motor is greater than or equal to the maximum value of the cutting torque preset range, the cutting action control unit immediately stops the operation of the second servo motor and records the real-time torque value and the stop time.

[0031] The maximum value of the preset range of cutting torque is , the minimum value of the preset range of cutting torque is , the real-time torque value of the second servo motor is If the real-time torque value of the second servo motor is Greater than or equal to the maximum value of the preset cutting torque range , the cutting action control unit immediately stops the operation of the second servo motor and records the real-time torque value and stop time. Less than the maximum value of the preset cutting torque range , then continue cutting.

[0032] Specifically, in this embodiment, a pressure range threshold is set in the sample cutting action control unit. The pressure range threshold is related to the type and moisture content of the soil sample. There are three pressure range thresholds, including a low pressure range threshold, a medium pressure range threshold and a high pressure range threshold. When the soil sample cutting action is performed, the real-time sample cutting pressure is detected according to the real-time radial pressure and real-time axial pressure of the selected pressure range threshold. When any one of the real-time radial pressure and the real-time axial pressure is greater than or equal to the maximum value of any selected pressure range threshold, the sample cutting action control unit immediately stops the operation of the second servo motor and records the real-time sample cutting pressure and the stop time.

[0033] In the embodiment, the pressure range thresholds include: a low pressure range threshold set at 0.1 to 1.0 MPa, which is suitable for soft soil samples such as clay; a medium pressure range threshold set at 1.0 to 3.0 MPa, which is suitable for soil samples of medium hardness such as silt; and a high pressure range threshold set at 3.0 to 10.0 MPa, which is suitable for hard soil samples such as sand or soil samples containing a large number of coarse particles.

[0034] When the test soil sample is clay, the actual cutting pressure is 1.1MPa, then the cutting action control unit immediately stops the operation of the second servo motor and records the real-time cutting pressure and stop time. If it is other types of soil samples, the judgment process is the same as the above process, and will not be repeated here. The combined control of the two pressure sensors can realize comprehensive monitoring of the stress state of the soil sample cutter during the cutting process, and the structural damage caused by the cutter overload. The annular sensor can detect the radial force uniformity to avoid vibration or wear caused by eccentric load. The purpose of locking the motor pad and the torque sensor is to achieve high-precision measurement and stable transmission of torque, while suppressing vibration interference through structural optimization and optimizing the cutting state of the soil sample cutter.

[0035] Specifically, in this embodiment, the low pressure maximum threshold of the low pressure range threshold is the same as the medium pressure minimum threshold of the medium pressure range threshold, and the high pressure minimum threshold of the high pressure range threshold is the same as the medium pressure maximum threshold of the medium pressure range threshold.

[0036] Specifically, in this embodiment, when the second servo motor stops running, the sample cutting action control unit drives the first servo motor and the third servo motor to move, so that the soil sample cutting connection module is lifted to the vertical initial position and the horizontal initial position. The vertical initial position is that the first external sensing piece 24 is in the middle position of the first photoelectric sensor 21 and the third photoelectric sensor 23, and the horizontal initial position is that the second external sensing piece 36 is in the middle position of the fourth photoelectric sensor 35 and the fifth photoelectric sensor 32.

[0037] The soil sample cutter used for geotechnical testing precisely controls the movement and cutting depth of the cutting head, ensuring accurate and consistent cutting every time, enhancing the reliability of test results. Real-time pressure monitoring during cutting and limit protection prevent overload and equipment damage, ensuring operator and equipment safety. Automated control and data logging reduce manual intervention, improve test efficiency, and shorten test time. The modular design and enclosed environment facilitate installation and maintenance of each module, extending the equipment's service life. The soil sample cutter's flexible overall design adapts to different soil samples and test requirements, enhancing its versatility and adaptability. The bottom support assembly provides support for the cutting box, ensuring stability and mobility. A steel drum secures the cutting box, ensuring stability during operation. Formazan wheels facilitate movement of the cutting box, facilitating operation from various locations and enhancing flexibility. The bottom support assembly is designed to adapt to diverse working environments, ensuring stability and safety under varying ground conditions. The cutting box's exterior structure, comprised of a closed enclosure, mitigates the effects of external factors (such as dust, temperature, and humidity) on the cutting process.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A soil sample cutting instrument for geotechnical testing, characterized in that: The invention comprises a sample cutting box, which is used for performing soil sample cutting, wherein a soil sample cutting connection module, a lifting and moving module and a fixed box body are arranged in the sample cutting box; a soil sample cutting connection module is used for the soil sample cutting process, and a soil sample cutting head connecting sleeve connected to the second servo motor in the soil sample cutting connection module is provided with a plurality of connecting grooves on the side surface, and bolts pass through the connecting grooves and are locked with the soil sample cutting head; a moving module, which comprises a lifting and moving module and a front and back moving module, which are arranged on both sides of the soil sample cutting connection module and are connected to the soil sample cutting connection module by bolts. The movable module is connected to the soil sample cutting connection module, and a number of photoelectric sensors are provided on the movable module for limiting the movement process; a fixed box body, which is used to install the soil sample cutting connection module and the soil sample cutting connection module, the fixed box body is composed of a steel frame and an external cutting box plate, the lifting and moving module and the fixed box body, a control panel is provided on the fixed box body, and a control unit is provided in the control panel, which is connected to the soil sample cutting connection module and the lifting and moving module, and is used to control the soil sample cutter to perform cutting action; the bottom support moving component is connected to the bottom box plate of the cutting box.

2. The soil sample cutting instrument for geotechnical testing according to claim 1, characterized in that: In the soil sample cutting connection module, the second servo motor is fixed on the motor pad through a reducer, the motor pad is locked with the torque sensor, and the lower part of the torque sensor is fixed on the torque sensor fixing seat, the torque sensor fixing seat is locked on the second servo motor support plate, the torque sensor is used to detect the real-time torque value of the second servo motor, the shaft head of the second servo motor is connected to the connecting shaft through the second coupling, the connecting shaft is connected to the upper joint in the connecting sleeve of the soil sample cutting head, the upper joint is threadedly connected to the soil sample cutting head, the top of the annular pressure sensor fixing part and the top of the first pressure sensor are locked with the second servo motor support plate, and the bottom of the annular pressure sensor fixing part is fixed with an annular pressure Force sensor, the bottom of the first pressure sensor is connected to the bearing connector, the bearing connector is connected to the connecting shaft through the bearing assembly, the annular pressure sensor is fixed to the connecting flange of the soil sample cutting head connecting sleeve, the annular pressure sensor is used to monitor the real-time radial pressure of the soil sample cutting head connecting sleeve, the first pressure sensor is used for the real-time axial pressure transmitted by the second servo motor, the motor support side plates are locked on the left and right sides of the second servo motor support plate, the rib plates are locked on the front and rear sides of the second servo motor support plate, the second motor encoder is arranged on the second servo motor, and the second motor encoder is connected to the annular pressure sensor, the torque sensor, and the first pressure sensor.

3. The soil sample cutting instrument for geotechnical testing according to claim 1, characterized in that: The lifting and moving module includes a first slider driving mechanism located on the left and a first linear slide located on the right, the first slider driving mechanism including a first servo motor, a first slider, a first slider driving mechanism, a first photoelectric sensor, a third photoelectric sensor, a second photoelectric sensor, and a first external sensing piece, the second slider is slidably fixed on the first linear slide, the first servo motor is arranged at the top of the first slider driving mechanism, the first slider is slidably fixed on the first slider driving mechanism, the first slider driving mechanism is sequentially provided with a first photoelectric sensor, a third photoelectric sensor, and a second photoelectric sensor from top to bottom, the first external sensing piece is fixed on the side of the first slider, the first photoelectric sensor, the third photoelectric sensor, and the second photoelectric sensor are all connected to the first motor encoder of the first servo motor, the first slider and the motor support side plate are symmetrically arranged about the center line of the cutting box, the symmetrically arranged first slider and second slider are both connected to the motor support side plate, the first linear slide is fixed to the second linear slide through the fourth slider, and the first slider driving mechanism is fixed to the second slider driving mechanism through the third slider.

4. The soil sample cutting instrument for geotechnical testing according to claim 1, characterized in that: The forward and backward movement module includes: The second slider drive mechanism is located on the left and the second linear slide is located on the right. The second slider drive mechanism includes a fifth photoelectric sensor, a third servo motor, a sixth photoelectric sensor, a fourth photoelectric sensor, a second external sensing piece, a third slider, and a third motor encoder. The fourth slider is slidably fixed on the second linear slide. The third servo motor is provided on the second slider drive mechanism. The third slider is slidably fixed on the second slider drive mechanism. The second slider drive mechanism is provided with a fourth photoelectric sensor, a fifth photoelectric sensor, and a sixth photoelectric sensor from left to right. The second external sensing piece is fixed on the side of the third slider. The fourth photoelectric sensor, the fifth photoelectric sensor, and the sixth photoelectric sensor are all connected to the first motor encoder of the third servo motor. The third slider and the fourth slider are symmetrically arranged about the center line of the sample cutting box. The second slider drive mechanism and the fourth slider are both locked and fixed to the steel frame in the box.

5. The soil sample cutting instrument for geotechnical testing according to claim 1, characterized in that: The fixed box body is composed of a steel frame composed of several steel sections, and the cutting box panel is fixed on the periphery of the steel sections. The handle and the control screen are arranged on the cutting box door panel of the cutting box. The control screen is provided with a display screen and several buttons. The control screen is connected to the first photoelectric sensor, the third photoelectric sensor, the second photoelectric sensor, the third servo motor, the sixth photoelectric sensor, the fourth photoelectric sensor, the first motor encoder, the second motor encoder, the third motor encoder, the torque sensor, the annular pressure sensor, and the first pressure sensor. The buttons are connected to the first motor encoder, the second motor encoder, and the third motor encoder. The steel section connections of the steel frame are reinforced with angle codes, and the angle codes are L-shaped.

6. The soil sample cutting instrument for geotechnical testing according to claim 1, characterized in that: The bottom supporting moving assembly includes a Forma wheel, a bottom rectangular fixed frame, a lower connecting flange, a steel cylinder, a connecting plate, an upper connecting flange, and a sample placement table. The lower end of the steel cylinder is bolted to the upper connecting flange and the lower end is connected to the lower connecting flange. The upper connecting flange is locked to the connecting plate. The sample cutting box is fixed on the connecting plate. A sample placement table is provided in the middle of the connecting plate. A gravity sensor is provided on the sample placement table. The gravity sensor is used to detect the actual weight of the sample soil. The gravity sensor is connected to the first servo motor. The lower connecting flange is connected to the bottom rectangular fixed frame by bolts. Pads are provided at the four corners of the bottom surface of the bottom rectangular fixed frame. The Forma wheel is locked to the bottom rectangular fixed frame by passing bolts through the pads.

7. The soil sample cutting instrument for geotechnical testing according to claim 1, characterized in that: A sample cutting action control unit is provided in the control unit. The sample cutting action control unit is provided with a sample cutting torque preset range for the second servo motor. When the soil sample cutting action is performed, if the real-time torque value of the second servo motor is greater than or equal to the maximum value of the sample cutting torque preset range, the sample cutting action control unit immediately stops the operation of the second servo motor and records the real-time torque value and the stop time.

8. The soil sample cutting instrument for geotechnical testing according to claim 7, characterized in that: A pressure range threshold is set in the sample cutting action control unit. The pressure range threshold is related to the type and moisture content of the soil sample. There are three pressure range thresholds, including a low pressure range threshold, a medium pressure range threshold and a high pressure range threshold. When the soil sample cutting action is performed, the real-time sample cutting pressure is detected according to the real-time radial pressure and real-time axial pressure according to the selected pressure range threshold. When any one of the real-time radial pressure and the real-time axial pressure is greater than or equal to the maximum value of any selected pressure range threshold, the sample cutting action control unit immediately stops the operation of the second servo motor and records the real-time sample cutting pressure and the stop time.

9. The soil sample cutting instrument for geotechnical testing according to claim 8, characterized in that: The low pressure maximum threshold of the low pressure range threshold is the same as the medium pressure minimum threshold of the medium pressure range threshold, and the high pressure minimum threshold of the high pressure range threshold is the same as the medium pressure maximum threshold of the medium pressure range threshold.

10. The soil sample cutting instrument for geotechnical testing according to claim 7 or 8, characterized in that: When the second servo motor stops running, the sample cutting action control unit drives the first servo motor and the third servo motor to move, so that the soil sample cutting connection module is lifted to the vertical initial position and the horizontal initial position. The vertical initial position is that the first external sensing piece is in the middle position of the first photoelectric sensor and the third photoelectric sensor, and the horizontal initial position is that the second external sensing piece is in the middle position of the fourth photoelectric sensor and the fifth photoelectric sensor.

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