A vane shear test device for soil strength testing

Abstract

The application discloses a soil strength testing vane shear test device in the technical field of geotechnical engineering, which comprises a power assembly, a second transmission shaft, a first transmission shaft and a screw rod arranged in sequence according to the transmission sequence, and a screw rod connector for fixedly connecting a test structure is arranged at the lower end of the screw rod; the vane shear test device has two working modes of up-down movement mode and rotary shear mode; when the third transmission assembly rotates following the second transmission shaft, the second transmission assembly fixes the first transmission shaft, and the screw rod constraint assembly restricts the rotation of the screw rod, the screw rod drives the test mechanism to move upwards or downwards; when the first transmission assembly rotates following the first transmission shaft, the fourth transmission assembly rotates following the second transmission shaft, and the screw rod constraint assembly releases the screw rod, the screw rod drives the test mechanism to rotate and shear.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical engineering, and particularly relates to a vane shear test device for soil strength test. BACKGROUND

[0002] The vane shear test is a traditional test method for testing the undrained shear strength of saturated cohesive soil. It has the advantages of avoiding the disturbance of the soil sampling process and directly reflecting the natural strength of the soil.

[0003] When the vane shear test is carried out, the vane is first pressed into the stratum to a specified depth, and then the vane is uniformly rotated at a certain speed to test the torque of the vane, and the measured torque is converted into the undrained shear strength of the clay according to the size of the vane.

[0004] In the current common vane test system, most of them use a set of hydraulic system + one motor or two motors to drive the penetration and rotation shear of the probe rod respectively. Two sets of power systems will increase the weight of the test equipment, thereby making the whole system inconvenient to install and transfer. As for the device for controlling the penetration of the probe rod, the common vane equipment generally adopts a loading beam matched with a screw rod or a guide rail with a length greater than the stroke. This structure not only needs to constantly lengthen the probe rod during the penetration process, but also significantly increases the size of the loading device in the vertical direction. SUMMARY

[0005] The present application aims to provide a vane shear test device for soil strength test, so as to solve the technical problem that the penetration process and the rotation shear process of the vane shear test device in the prior art are executed by two different power devices, which not only has a large volume and weight and is inconvenient to transfer, but also has a long test time.

[0006] To solve the above technical problems, the present application specifically provides a vane shear test device for soil strength test, which comprises a power assembly, a second transmission shaft, a first transmission shaft and a screw rod arranged in sequence according to the transmission order, and a screw rod connector for fixedly connecting a test structure is arranged at the lower end of the screw rod.

[0007] The second transmission shaft is sequentially provided with a transmission input gear and third and fourth transmission assemblies in transmission connection with the power assembly, the first transmission shaft is provided with first and second transmission assemblies, and the screw rod is provided with a screw rod rotation assembly and a screw rod constraint assembly; wherein the third transmission assembly, the first transmission assembly and the screw rod rotation assembly are sequentially in transmission connection, the fourth transmission assembly, the second transmission assembly and the screw rod constraint assembly are sequentially in transmission connection, the third transmission assembly, the fourth transmission assembly and the first transmission assembly can be selected to follow or not follow the rotation of the transmission shaft, the second transmission assembly can fix or release the first transmission shaft, and the screw rod constraint assembly can release or limit the rotation of the screw rod;

[0008] The Vane Shear Tester has two working modes of up-down movement mode and rotary shear mode:

[0009] When the third transmission assembly follows the rotation of the second transmission shaft, the second transmission assembly fixes the first transmission shaft, and the screw rod constraint assembly limits the rotation of the screw rod, the screw rod drives the test mechanism to move upward or downward;

[0010] When the first transmission assembly follows the rotation of the first transmission shaft, the fourth transmission assembly follows the rotation of the second transmission shaft, and the screw rod constraint assembly releases the screw rod, the screw rod drives the test mechanism to perform rotary shear.

[0011] As a preferred scheme of the present application, the Vane Shear Tester further comprises first, second, third and fourth mounting plates fixedly mounted on the device frame;

[0012] Both ends of the second transmission shaft are fixed on the first and second mounting plates through bearings, and the second transmission shaft is sequentially provided with a transmission input gear, a third clutch, a sixth gear and a fourth clutch from high to low; the transmission input gear is in key connection with the second transmission shaft, the input disc of the third clutch is in key connection with the second transmission shaft, the output disc of the third clutch is in screw connection with the sixth gear, and the sixth gear is mounted on the second transmission shaft through a bearing; the input disc of the fourth clutch is in key connection with the second transmission shaft, the output disc of the fourth clutch is in screw connection with a reducer input disc, the other end of the reducer input disc is linked with an input end of a planetary reducer, the planetary reducer is screwed on the lower end face of the third mounting plate, and the output end of the planetary reducer is in key connection with a seventh gear;

[0013] Two ends of the first transmission shaft are fixed on the first mounting plate and the fourth mounting plate through bearings, and a first clutch, a third gear, a second clutch, a fourth gear and a fifth gear are sequentially arranged on the first transmission shaft from high to low; an input disc of the first clutch is connected with the first transmission shaft through a key, an output disc is screwed with the third gear, the third gear is installed on the first transmission shaft through a bearing and is engaged with the sixth gear; an input disc of the second clutch is connected with the first transmission shaft through a key, an output disc is screwed with the third mounting plate, the fourth gear and the fifth gear are both connected with the first transmission shaft through a key, and the fifth gear is engaged with the seventh gear;

[0014] The screw rod is sequentially provided with a turbine, a first gear, a key wheel and a second gear from high to low; the turbine is screwed with the screw rod through an internal thread, the turbine is fixedly arranged in a turbine sleeve, the turbine sleeve is screwed below the first mounting plate, the first gear is connected with the turbine below through a key and is engaged with the third gear; the key wheel is connected with a key groove on the surface of the screw rod through an internal key, and the key wheel is fixedly arranged in a key wheel sleeve, and the key wheel sleeve is screwed below the third mounting plate.

[0015] As a preferred scheme of the present application, the test structure comprises a hoop, a test assembly and a shell for protecting the test assembly, and an end of the shell is screwed with a probe rod connector;

[0016] The probe rod connector and the screw rod connector are both provided with a circular connecting piece capable of being clamped by the hoop, and a square protrusion is arranged on one of the circular connecting pieces and a square groove matched with the square protrusion is arranged on the other circular connecting piece.

[0017] As a preferred scheme of the present application, the test assembly comprises a torsion sensor, a sensor connector, a sensor connecting shaft, a probe rod and a cross plate, the torsion sensor is screwed with the shell, a square protrusion at a measuring end of the torsion sensor is butted against a square insertion hole on one side of the sensor connector, the sensor connector is screwed with the sensor connecting shaft, one end of the sensor connecting shaft is screwed with the probe rod, and the other end of the probe rod is screwed with the cross plate.

[0018] Conical bearings are arranged on two sides of the sensor connecting shaft, the conical bearings are in contact with the shell, a ceramic bearing is arranged at a position where the probe rod is screwed with the sensor connecting shaft, and the ceramic bearing is in contact with the shell.

[0019] As a preferred scheme of the present application, the shell comprises sensor outer sleeve, bearing set upper sleeve, bearing set lower sleeve and probe rod outer sleeve connected in sequence, the torsion sensor is screwed in the sensor outer sleeve, the probe rod connector is screwed with the sensor outer sleeve, two conical bearings are in contact with the bearing set upper sleeve and the bearing set lower sleeve respectively, and the ceramic bearing is in contact with the probe rod outer sleeve.

[0020] As a preferred scheme of the present application, the probe rod is composed of multiple rod bodies connected in sequence, and a ceramic bearing is arranged at each connection position, and the probe rod outer sleeve is composed of multiple sleeve bodies connected in sequence.

[0021] As a preferred scheme of the present application, a conductive slip ring is arranged on the probe rod connector, and an electrode on the fixed ring is connected with a lead wire of the torsion sensor, and an electrode on the rotating ring is connected with an external measurement and collection device.

[0022] As a preferred scheme of the present application, the power assembly comprises a motor, a motor reducer and a reducer output gear, the reducer output gear is installed on the reducer output shaft through key connection, and the reducer output gear is engaged with the transmission device input gear.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The vane shear test device can enter the up-down movement mode or the rotary shear mode by controlling the state of each transmission assembly and the screw rod constraint assembly. When the third transmission assembly rotates with the second transmission shaft, the second transmission assembly fixes the first transmission shaft, and the screw rod constraint assembly restricts the rotation of the screw rod, the screw rod drives the test mechanism to move upward or downward, and the test mechanism is pressed into the stratum; when the first transmission assembly rotates with the first transmission shaft, the fourth transmission assembly rotates with the second transmission shaft, and the screw rod constraint assembly releases the screw rod, the screw rod drives the test mechanism to rotate and shear, and the undrained shear strength of saturated clay is tested. A set of power system is used to realize the penetration and rotary shear process of the vane, thereby reducing the volume and weight of the loading device, facilitating the installation and transfer of the device.

[0025] In the present application, guide rails are not used, and the test mechanism is directly driven downward by the screw rod 4, thereby shortening the length of the device as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be obtained from the provided drawings without creative labor.

[0027] Figure 1 It is a schematic diagram of the overall structure of the cross plate shear test device in the present application.

[0028] Figure 2 It is a schematic diagram of the structure of the first perspective of the driving assembly in the present application.

[0029] Figure 3 It is a schematic diagram of the structure of the second perspective of the driving assembly in the present application.

[0030] Figure 4 It is a schematic diagram of the structure of the third perspective of the driving assembly in the present application.

[0031] Figure 5 It is a schematic diagram of the cross section of the test mechanism in the present application.

[0032] Figure 6 It is a schematic diagram of the structure of the connection of the cross plate and the probe rod in the present application.

[0033] Figure 7 It is a schematic diagram of the structure of the connection of the hoop, the screw rod connector and the probe rod connector in the present application.

[0034] Figure 8 It is a cross plate shear device provided with lifting guide rails in the prior art.

[0035] The reference numerals in the drawings represent the following respectively:

[0036] 1 - power assembly, 101 - motor, 102 - motor reducer, 103 - reducer output gear;

[0037] 2 - second transmission shaft, 201 - transmission device input gear, 202 - third clutch, 203 - sixth gear, 204 - fourth clutch, 205 - reducer input disc, 206 - planetary reducer, 207 - seventh gear;

[0038] 3 - first transmission shaft, 301 - first clutch, 302 - third gear, 303 - second clutch, 304 - fourth gear, 305 - fifth gear;

[0039] 4 - screw rod, 401 - turbine, 402 - first gear, 403 - key wheel, 404 - second gear, 405 - turbine sleeve, 406 - key wheel sleeve, 407 - screw rod connector;

[0040] 501-first mounting plate, 502-second mounting plate, 503-third mounting plate, 504-fourth mounting plate;

[0041] 6-test structure, 601-hoop, 602-probe connecting piece, 603-torque sensor, 604-sensor connecting piece, 605-sensor connecting shaft, 606-probe, 607-cross plate, 608-conical bearing, 609-ceramic bearing, 6010-sensor outer sleeve, 6011-bearing set upper sleeve, 6012-bearing set lower sleeve, 6013-probe outer sleeve, 6014-conductive slip ring;

[0042] 7-third transmission assembly, 8-fourth transmission assembly, 9-first transmission assembly, 10-second transmission assembly, 11-screw rod rotating assembly, 12-screw rod constraint assembly. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] The present application specifically provides a vane shear test device for soil strength test, comprising a power assembly 1, a second transmission shaft 2, a first transmission shaft 3 and a screw rod 4 arranged in sequence according to the transmission sequence, and a screw rod connecting head 407 for fixedly connecting a test structure 6 is fixedly arranged at the lower end of the screw rod 4;

[0045] The second transmission shaft 2 is sequentially provided with a transmission device input gear 201 in transmission connection with the power assembly 1, a third transmission assembly 7 and a fourth transmission assembly 8, the first transmission shaft 3 is provided with a first transmission assembly 9 and a second transmission assembly 10, and the screw rod 4 is provided with a screw rod rotating assembly 11 and a screw rod constraint assembly 12; wherein the third transmission assembly 7, the first transmission assembly 9 and the screw rod rotating assembly 11 are sequentially in transmission connection, the fourth transmission assembly 8, the second transmission assembly 10 and the screw rod constraint assembly 12 are sequentially in transmission connection, the third transmission assembly 7, the fourth transmission assembly 8 and the first transmission assembly 9 can be selectively followed or not followed in transmission shaft rotation, the second transmission assembly 10 can be fixed or released for the first transmission shaft 3, and the screw rod constraint assembly 12 can release or limit the rotation of the screw rod 4;

[0046] The vane shear test device has two working modes of up-down motion mode and rotating shear mode:

[0047] When the third transmission assembly 7 rotates following the second transmission shaft 2, the second transmission assembly 10 fixes the first transmission shaft 3, and the screw rod constraint assembly 12 restricts the rotation of the screw rod 4. At this time, the second transmission shaft 2 rotates, the first transmission shaft 3 is static, the fourth transmission assembly 8 does not rotate following the second transmission shaft 2, and the first transmission assembly 9 can rotate freely. At this time, the screw rod 4 drives the testing mechanism to move upward or downward;

[0048] When the first transmission assembly 9 rotates following the first transmission shaft 3, the fourth transmission assembly 8 rotates following the second transmission shaft 2, and the screw rod constraint assembly 12 releases the screw rod 4. At this time, the first transmission shaft 3, the second transmission shaft 2 and the screw rod 4 can rotate, and the screw rod 4 drives the testing mechanism to rotate and shear.

[0049] The cross plate shear test device can enter the upward and downward movement mode or the rotary shear mode by controlling the state of each transmission assembly and the screw rod constraint assembly 12. That is, when the third transmission assembly 7 rotates following the second transmission shaft 2, the second transmission assembly 10 fixes the first transmission shaft 3, and the screw rod constraint assembly 12 restricts the rotation of the screw rod 4, the screw rod 4 drives the testing mechanism to move upward or downward, and the testing mechanism is pressed into the stratum. When the first transmission assembly 9 rotates following the first transmission shaft 3, the fourth transmission assembly 8 rotates following the second transmission shaft 2, and the screw rod constraint assembly 12 releases the screw rod 4, the screw rod 4 drives the testing mechanism to rotate and shear, and the undrained shear strength of the saturated clay is tested. One set of mechanical device is used to realize the penetration and rotary shear process of the cross plate 607, thereby reducing the volume and weight of the loading device.

[0050] As shown in Figure 8 For the device for controlling the penetration operation of the probe rod, the loading beam is matched with the guide rail with a length greater than the stroke, and the guide rail significantly increases the size of the loading device in the vertical direction.

[0051] In the present application, the guide rail is not used, and the screw rod 4 directly drives the testing mechanism to move downward, thereby shortening the length of the device as a whole.

[0052] Further, the specific setting mode of each transmission assembly, the screw rod constraint assembly 12 and the screw rod rotation assembly 11 is as follows:

[0053] The third transmission assembly 7 comprises a third clutch 202 and a sixth gear 203. The fourth transmission assembly 8 comprises a fourth clutch 204, a reducer input disc 205, a planetary reducer 206 and a seventh gear 207. The first transmission assembly 9 comprises a first clutch 301 and a third gear 302. The second transmission assembly 10 comprises a second clutch 303, a fourth gear 304 and a fifth gear 305. The screw rotation assembly 11 comprises a worm wheel 401, a first gear 402 and a worm wheel sleeve 405. The screw constraint assembly 12 comprises a key wheel 403, a second gear 404 and a key wheel sleeve 406.

[0054] The screw cross plate shearing test device further comprises a first mounting plate 501, a second mounting plate 502, a third mounting plate 503 and a fourth mounting plate 504 fixedly installed on the device frame.

[0055] The second transmission shaft 2 is fixed at both ends by bearings on the first mounting plate 501 and the second mounting plate 502. The transmission device input gear 201, the third clutch 202, the sixth gear 203 and the fourth clutch 204 are sequentially arranged from high to low on the second transmission shaft 2. The transmission device input gear 201 is connected with the second transmission shaft 2 by a key. The input disc of the third clutch 202 is connected with the second transmission shaft 2 by a key. The output disc of the third clutch 202 is screwed with the sixth gear 203. The sixth gear 203 is installed on the second transmission shaft 2 by a bearing. The input disc of the fourth clutch 204 is connected with the second transmission shaft 2 by a key. The output disc of the fourth clutch 204 is screwed with the reducer input disc 205. The other end of the reducer input disc 205 is linked with the input end of the planetary reducer 206. The planetary reducer 206 is screwed on the lower end face of the third mounting plate 503. The output end of the planetary reducer 206 is connected with the seventh gear 207 by a key.

[0056] The first transmission shaft 3 is fixed at both ends by bearings on the first mounting plate 501 and the fourth mounting plate 504. The first clutch 301, the third gear 302, the second clutch 303, the fourth gear 304 and the fifth gear 305 are sequentially arranged from high to low on the first transmission shaft 3. The input disc of the first clutch 301 is connected with the first transmission shaft 3 by a key. The output disc is screwed with the third gear 302. The third gear 302 is installed on the first transmission shaft 3 by a bearing and engages with the sixth gear 203. The input disc of the second clutch 303 is connected with the first transmission shaft 3 by a key. The output disc is screwed with the third mounting plate 503. The fourth gear 304 and the fifth gear 305 are both connected with the first transmission shaft 3 by a key. The fifth gear 305 engages with the seventh gear 207.

[0057] The screw rod 4 is sequentially provided with a turbine 401, a first gear 402, a key wheel 403 and a second gear 404 from top to bottom; the turbine 401 is threadedly connected with the screw rod 4 through an internal thread, the turbine 401 is fixedly arranged in a turbine sleeve 405, the turbine sleeve 405 is screwed below a first mounting plate 501, the first gear 402 is keyed below the turbine 401 and engaged with the third gear 302; the key wheel 403 is connected with a key groove on the surface of the screw rod 4 through an internal key, and the key wheel 403 is fixedly arranged in a key wheel sleeve 406, and the key wheel sleeve 406 is screwed below a third mounting plate 503.

[0058] The above clutch, when the clutch is attracted, the input disc and the output disc of the clutch are fixed together and move synchronously; when the clutch is separated, the input disc and the output disc are separated and move independently.

[0059] When the screw rod 4 needs to drive the test mechanism to move upward or downward, the first clutch 301 is disconnected, the second clutch 303 is attracted, the third clutch 202 is attracted, and the fourth clutch 204 is disconnected. Start the power assembly 1 to drive the second transmission shaft 2, the sixth gear 203, the third gear 302, the first gear 402 and the turbine 401 in turn, and at the same time, since the second clutch 303 is attracted, the rotation of the key wheel 403 is constrained, at this time, the screw rod 4 moves in the vertical direction upward or downward.

[0060] When the screw rod 4 needs to drive the test mechanism to rotate and shear, the first clutch 301 is attracted, the second clutch 303 is disconnected, the third clutch 202 is disconnected, and the fourth clutch 204 is attracted. Start the power assembly 1 to drive the second transmission shaft 2, the planetary reducer 206, the seventh gear 207, the fifth gear 305, the first transmission shaft 3, the fourth gear 304 and the third gear 302, the second gear 404 and the first gear 402, the key wheel 403 and the turbine 401 and the screw rod 4 in turn, and the screw rod 4 drives the test mechanism to rotate and shear.

[0061] For the vane shear test task in the laboratory environment, the test depth is limited, the test space is limited, the control accuracy of the shear rate is high, the operation steps are simple and fast, and the existing vane loading device used in the field exploration engineering is no longer suitable for the soil strength test task in the laboratory. The present application adopts a servo motor as a power source to control the switching of the above two loading processes by using a clutch, has the advantages of relatively light loading equipment, compact structure, accurate loading speed control, fast and simple switching speed of penetration-rotation mode, and is suitable for the soil strength test task in the laboratory.

[0062] Further, the approximate composition of the test mechanism and the connection mode of the test mechanism and the screw rod 4 are as follows:

[0063] The test structure 6 comprises a collar 601, a test assembly and a shell for protecting the test assembly, the end of the shell is screwed with the probe connecting piece 602;

[0064] The probe connecting piece 602 and the screw rod connecting head 407 are both provided with a circular connecting piece capable of being clamped by the collar 601, and one of the circular connecting pieces is provided with a square protrusion, and the other circular connecting piece is provided with a square groove matched with the square protrusion.

[0065] Further, the test assembly comprises a torsion sensor 603, a sensor connecting piece 604, a sensor connecting shaft 605, a probe 606 and a vane 607, the torsion sensor 603 is screwed with the shell, the square protrusion at the measuring end of the torsion sensor 603 is butted with the square socket on one side of the sensor connecting piece 604, the sensor connecting piece 604 is screwed with the sensor connecting shaft 605, the sensor connecting shaft 605 is screwed with one end of the probe 606, and the other end of the probe 606 is screwed with the vane 607;

[0066] The two sides of the sensor connecting shaft 605 are provided with conical bearings 608, the conical bearings 608 are in contact with the shell, the screwing position of the probe 606 with the sensor connecting shaft 605 is provided with a ceramic bearing 609, the ceramic bearing 609 is in contact with the shell, and the ceramic bearing 609 provides measurement constraint for the probe 606, so that the probe 606 does not occur buckling instability due to excessive axial pressure in the penetration process.

[0067] The control accuracy of the vertical penetration speed is high, and the power subsystem (i.e. the transmission system composed of the plurality of transmission shafts and transmission assemblies) can also perform penetration type geotechnical test operations such as cone penetration test (CPT), in-situ soil sampling, etc. after replacing the test head.

[0068] The power subsystem and the test structure are easy to disassemble and assemble, and can be quickly changed to other test types such as cone penetration test after completing the vane shear test.

[0069] Further, the shell comprises a sensor outer sleeve 6010, an upper bearing set sleeve 6011, a lower bearing set sleeve 6012 and a probe outer sleeve 6013 which are sequentially screwed, the torsion sensor 603 is screwed in the sensor outer sleeve 6010, the probe connecting piece 602 is screwed with the sensor outer sleeve 6010, the two conical bearings 608 are respectively in contact with the upper bearing set sleeve 6011 and the lower bearing set sleeve 6012, and the ceramic bearing 609 is in contact with the probe outer sleeve 6013.

[0070] The probe sheath design is adopted, which eliminates the interference of the soil resistance around the probe on the torque measurement value.

[0071] The end of the probe outer sleeve 6013 is conical, which can reduce the soil resistance received in the process of pressing into the stratum.

[0072] When the probe rod 606 and the cross plate 607 are raised or lowered, the probe rod 606 transmits the torque of the cross plate 607 to the conical bearing 608 via the sensor connecting shaft 605, and further borne by the upper bearing set sleeve 6011 and the lower bearing set sleeve 6012, so as to avoid the interference and even damage of the torque sensor 603 due to the axial pressure.

[0073] When the probe rod 606 and the cross plate 607 are rotated, the probe rod 606 transmits the torque of the cross plate 607 to the torque sensor 603 via the sensor connecting shaft 605 and the sensor connecting piece 604.

[0074] Further, the probe rod 606 is connected by screwing the multiple rod bodies end to end, and a ceramic bearing 609 is arranged at each screwing position, and the probe rod sleeve 6013 is connected by screwing the multiple sleeve bodies end to end.

[0075] Further, the probe rod connecting piece 602 is provided with a conductive slip ring 6014, and the electrodes on the fixed ring are connected with the lead wires of the torque sensor 603, and the electrodes on the rotating ring are connected with the external measurement and collection device. The conductive slip ring 6014 can prevent the wires of the external measurement and collection device from winding on the test structure 6 when the cross plate 607 is rotated.

[0076] Further, the power assembly 1 comprises a motor 101, a motor speed reducer 102 and a speed reducer output gear 103, the speed reducer output gear 103 is installed on the speed reducer output shaft through key connection, and the speed reducer output gear 103 is engaged with the transmission device input gear 201.

[0077] In summary, the method for carrying out the cross plate 607 shear test by using the above test device is as follows:

[0078] The test structure 6 is installed on the lead screw connecting head 407, and the device is placed above the specified test position.

[0079] The first clutch 301 is disconnected, the second clutch 303 is attracted, the third clutch 202 is attracted, and the fourth clutch 204 is disconnected. Start the motor 101, and the lead screw 4 drives the cross plate 607 to penetrate into the soil body in the vertical direction.

[0080] When the cross plate 607 penetrates to the specified depth, stop the motor 101.

[0081] The first clutch 301 is attracted, the second clutch 303 is disconnected, the third clutch 202 is disconnected, and the fourth clutch 204 is attracted. Start the motor 101, and the lead screw 4 drives the cross plate 607 to rotate and shear.

[0082] After the cross plate 607 shear test is completed, the lead screw 4 drives the cross plate 607 to move upward away from the soil body in the vertical direction.

[0083] The above examples are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also considered to fall within the protection scope of the present application.

Claims

1. A vane shear test device for soil strength test, characterized in that, a power assembly (1), a second transmission shaft (2), a first transmission shaft (3) and a screw rod (4) are sequentially arranged in the order of transmission sequence, and a screw rod connector (407) for fixedly connecting a test structure (6) is fixedly arranged at the lower end of the screw rod (4); a transmission device input gear (201) in transmission connection with the power assembly (1), a third transmission assembly (7) and a fourth transmission assembly (8) are sequentially arranged on the second transmission shaft (2), a first transmission assembly (9) and a second transmission assembly (10) are arranged on the first transmission shaft (3), and a screw rod rotation assembly (11) and a screw rod constraint assembly (12) are arranged on the screw rod (4); wherein the third transmission assembly (7), the first transmission assembly (9) and the screw rod rotation assembly (11) are sequentially in transmission connection, the fourth transmission assembly (8), the second transmission assembly (10) and the screw rod constraint assembly (12) are sequentially in transmission connection, the third transmission assembly (7), the fourth transmission assembly (8) and the first transmission assembly (9) can be selected to follow or not follow the rotation of the transmission shaft, the second transmission assembly (10) can fix or release the first transmission shaft (3), and the screw rod constraint assembly (12) can release or limit the rotation of the screw rod (4); The vane shear test device has two working modes of up-down movement mode and rotation shear mode: When the third transmission assembly (7) follows the rotation of the second transmission shaft (2), the second transmission assembly (10) fixes the first transmission shaft (3), and the screw rod constraint assembly (12) limits the rotation of the screw rod (4), the screw rod (4) drives the test mechanism to move upward or downward; When the first transmission assembly (9) follows the rotation of the first transmission shaft (3), the fourth transmission assembly (8) follows the rotation of the second transmission shaft (2), and the screw rod constraint assembly (12) releases the screw rod (4), the screw rod (4) drives the test mechanism to rotate and shear.

2. The vane shear test device for soil strength test according to claim 1, characterized in that, the vane shear test device further comprises a first mounting plate (501), a second mounting plate (502), a third mounting plate (503) and a fourth mounting plate (504) fixedly installed on the device frame. The two ends of the second transmission shaft (2) are fixed on the first mounting plate (501) and the second mounting plate (502) through bearings, and the second transmission shaft (2) is sequentially provided with a transmission input gear (201), a third clutch (202), a sixth gear (203) and a fourth clutch (204) from high to low; the transmission input gear (201) is connected with the second transmission shaft (2) by a key, the input disc of the third clutch (202) is connected with the second transmission shaft (2) by a key, the output disc of the third clutch (202) is screwed with the sixth gear (203), and the sixth gear (203) is installed on the second transmission shaft (2) through a bearing; the input disc of the fourth clutch (204) is connected with the second transmission shaft (2) by a key, the output disc of the fourth clutch (204) is screwed with a reducer input disc (205), the other end of the reducer input disc (205) is linked with an input end of a planetary reducer (206), the planetary reducer (206) is screwed on the lower end face of the third mounting plate (503), and the output end of the planetary reducer (206) is connected with a seventh gear (207) by a key; The two ends of the first transmission shaft (3) are fixed on the first mounting plate (501) and the fourth mounting plate (504) through bearings, and the first transmission shaft (3) is sequentially provided with a first clutch (301), a third gear (302), a second clutch (303), a fourth gear (304) and a fifth gear (305) from high to low; the input disc of the first clutch (301) is connected with the first transmission shaft (3) by a key, the output disc is screwed with the third gear (302), the third gear (302) is installed on the first transmission shaft (3) through a bearing and is engaged with the sixth gear (203); the input disc of the second clutch (303) is connected with the first transmission shaft (3) by a key, the output disc is screwed with the third mounting plate (503), the fourth gear (304) and the fifth gear (305) are both connected with the first transmission shaft (3) by a key, and the fifth gear (305) is engaged with the seventh gear (207); The screw rod (4) is sequentially provided with a turbine (401), a first gear (402), a key wheel (403) and a second gear (404) from high to low; the turbine (401) is connected with the screw rod (4) by internal threads, the turbine (401) is fixedly arranged in a turbine sleeve (405), the turbine sleeve (405) is screwed below the first mounting plate (501), the first gear (402) is connected below the turbine (401) by a key and is engaged with the third gear (302); the key wheel (403) is connected with the key groove on the surface of the screw rod (4) by an internal key, the key wheel (403) is fixedly arranged in a key wheel sleeve (406), and the key wheel sleeve (406) is screwed below the third mounting plate (503).

3. The vane shear test device for soil strength test according to claim 1, characterized in that, the test structure (6) comprises a ring (601), a test assembly and a shell for protecting the test assembly, and the end of the shell is screwed with a probe rod connector (602); the probe rod connector (602) and the screw rod connector (407) are provided with a circular connecting piece capable of being clamped by the ring (601), and one of the circular connecting pieces is provided with a square protrusion, and the other circular connecting piece is provided with a square groove matched with the square protrusion.

4. The vane shear test device for soil strength test according to claim 3, characterized in that, the test assembly comprises a torsion sensor (603), a sensor connector (604), a sensor connecting shaft (605), a probe rod (606) and a vane (607), the torsion sensor (603) is screwed with the shell, the square protrusion at the measuring end of the torsion sensor (603) is butted with the square socket on one side of the sensor connector (604), the sensor connector (604) is screwed with the sensor connecting shaft (605), the sensor connecting shaft (605) is screwed with one end of the probe rod (606), and the other end of the probe rod (606) is screwed with the vane (607); both sides of the sensor connecting shaft (605) are provided with conical bearings (608), the conical bearings (608) are in contact with the shell, and the probe rod (606) is provided with a ceramic bearing (609) at the screwing position with the sensor connecting shaft (605), and the ceramic bearing (609) is in contact with the shell.

5. The vane shear test device for soil strength test according to claim 4, characterized in that, the shell comprises a sensor outer sleeve (6010), an upper bearing set sleeve (6011), a lower bearing set sleeve (6012) and a probe rod outer sleeve (6013) screwed in sequence, the torsion sensor (603) is screwed in the sensor outer sleeve (6010), the probe rod connector (602) is screwed with the sensor outer sleeve (6010), the two conical bearings (608) are respectively in contact with the upper bearing set sleeve (6011) and the lower bearing set sleeve (6012), and the ceramic bearing (609) is in contact with the probe rod outer sleeve (6013).

6. The vane shear test device for soil strength test according to claim 5, characterized in that, the probe rod connector (602) is provided with a conductive slip ring (6014), and the electrodes on the fixed ring are connected with the lead wires of the torsion sensor (603), and the electrodes on the rotating ring are connected with the external measurement and collection equipment.

7. The vane shear test device for soil strength test according to claim 5, characterized in that, the probe rod (606) is composed of multiple rod bodies screwed end to end, and each screwing position is provided with a ceramic bearing (609), and the probe rod outer sleeve (6013) is composed of multiple sleeve bodies screwed end to end.

8. The vane shear test device for soil strength test according to claim 2, characterized in that, The power assembly (1) comprises a motor (101), a motor reducer (102) and a reducer output gear (103), the reducer output gear (103) is installed on the reducer output shaft through key connection, and the reducer output gear (103) is meshed with the transmission device input gear (201).

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