An experimental platform and method for detecting material properties of geotechnical materials

Abstract

The application discloses an experimental platform for detecting material characteristics of rock-soil materials, which comprises a micro-distance propulsion mechanism for driving a pressure propulsion head to move downwards, wherein the micro-distance propulsion mechanism comprises a circular ring-shaped micro-distance lifting platform, and the pressure propulsion head is synchronous with the circular ring-shaped micro-distance lifting platform; during the operation of the device, the central winding post is displaced downwards on the basis of not rotating, so that the first traction rope and the second traction rope are spirally wound on the central winding post with a large enough helical pitch, and the problem of mutual covering of the first traction rope and the second traction rope during the winding process on the central winding post is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of geotechnical material detection. BACKGROUND

[0002] The material compression resistance detection is an important project of the material property detection of geotechnical material. The existing compression test advancing mechanism generally uses a hydraulic motor to drive a screw rod to advance. If one rotation of the screw rod is regarded as one advancing unit, the unit advancing distance is a helical pitch. Since the geotechnical material is brittle, the geotechnical material will be crushed by a very small advancing distance during the compression damage experiment. The actual advancing distance of the compression device will exceed the minimum advancing distance required for the material to be crushed. The helical pitch of the traditional screw rod cannot be infinitely reduced, so there is a certain limitation in dealing with the brittle material. It is necessary to design a more micro-distance and slower advancing mechanism to complete the compression test of the brittle material. SUMMARY

[0003] The application aims at overcoming the deficiencies in the prior art and provides an experimental platform for material property detection of geotechnical material, which can advance in a more micro-distance form.

[0004] The experimental platform for material property detection of geotechnical material comprises a micro-distance advancing mechanism for driving a pressure advancing head to advance downward in a micro-distance form.

[0005] The micro-distance advancing mechanism comprises a circular ring micro-distance lifting platform, and the pressure advancing head is synchronous with the circular ring micro-distance lifting platform.

[0006] The micro-distance advancing mechanism further comprises a fixed-height outer gear ring, a first universal ball advancing unit and a second universal ball advancing unit which are centrally symmetric relative to the axis of the outer gear ring, and the first universal ball advancing unit and the second universal ball advancing unit are synchronous with the outer gear ring.

[0007] The first universal ball advancing unit and the second universal ball advancing unit are synchronous with the outer gear ring.

[0008] Further, the first traction rope and the second traction rope are gradually wound on the central winding post in the process that the first universal ball pushing unit and the second universal ball pushing unit rotate synchronously with the outer gear ring, so that the first universal ball pushing unit and the second universal ball pushing unit rotate synchronously with the outer gear ring and also make centripetal motion gradually close to the central winding post, thereby pushing the circular ring micro-distance lifting platform to gradually descend.

[0009] Further, a top fixed platform is arranged above the outer gear ring; a cross beam is fixed on the inner side of the outer gear ring along the diameter direction, and a rotating shaft coaxial with the outer gear ring is fixed on the cross beam; the rotating shaft is rotatably installed in the bearing hole on the top fixed platform through a thrust bearing.

[0010] Further, a pair of vertical guide columns are fixedly arranged on the lower side of the circular ring micro-distance lifting platform, and a vertical top pressing column is fixedly connected to the lower ends of the pair of vertical guide columns through a connecting piece, and the lower end of the top pressing column is the pressure pushing head; a middle fixed platform with a fixed height is arranged below the circular ring micro-distance lifting platform, the middle fixed platform has a vertical guide column passing hole, the vertical guide column passes through the guide column passing hole, a supporting spring is further sleeved on the vertical guide column, and the two supporting springs elastically hold up the circular ring micro-distance lifting platform upward, so that the first universal ball and the second universal ball always contact the annular universal ball walking surface.

[0011] Further, the central winding post is hollow, a lifting guide block is fixedly connected to the lower end of the central winding post, vertical lifting guide holes are arranged at the two ends of the lifting guide block, a guide column seat is fixedly arranged on the middle fixed platform, a pair of longitudinal guide columns are fixed on the guide column seat, and the pair of longitudinal guide columns pass through the two lifting guide holes on the lifting guide block; a screw nut is fixedly connected to the upper end of the central winding post, and a lead screw matched with the screw nut is further arranged, and the upper end of the lead screw is fixedly connected to the cross beam; the rotation of the outer gear ring drives the rotation of the lead screw through the cross beam, and the rotation of the lead screw drives the downward displacement of the central winding post under the guidance of the pair of longitudinal guide columns and the threaded transmission.

[0012] Further, a pair of parallel transverse guide rods are arranged on the lower side of the cross beam in parallel, and the two ends of the transverse guide rods are fixedly connected to the cross beam through fixing seats; the first universal ball pushing unit and the second universal ball pushing unit can move along the transverse guide rods.

[0013] Further, a pressure sensor is arranged on the top pressing column.

[0014] Further, an output gear is further arranged, and the output gear is engaged with the outer gear ring.

[0015] Beneficial effect: during the operation of the device, the central winding post is displaced downward on the basis of not rotating, so that the first traction rope and the second traction rope are spirally wound on the central winding post with a large enough helical pitch, avoiding the problem of mutual covering of the first traction rope and the second traction rope during winding on the central winding post.

[0016] Since the gradualness of the gradual increase of the ball running surface in the centripetal direction can be designed at will, the unit propulsion amount of the traditional screw propulsion method is affected by the minimum helical pitch, thereby avoiding the problem that the actual propulsion distance exceeds the minimum propulsion distance required by the material being crushed due to the too fast propulsion speed, and making the compression condition of the rock-soil material sample a relatively gradual and gentle process from the initial compression to the crushing of the rock-soil material sample, so that the state and change process of the soil material sample under different pressures can be more objectively reflected. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the device; Figure 1 Figure 1 is a schematic diagram of the overall structure of the device;

[0018] Figure 1 is a schematic diagram of the overall structure of the device; Figure 2 Figure 1 is a schematic diagram of the overall structure of the device;

[0019] Figure 1 is a schematic diagram of the overall structure of the device; Figure 3 Figure 1 is a schematic diagram of the overall structure of the device;

[0020] Figure 4 Figure 1 is a schematic diagram of the overall structure of the device;

[0021] Figure 1 is a schematic diagram of the overall structure of the device; Figure 5 Figure 1 is a schematic diagram of the overall structure of the device; Figure 4 Figure 1 is a schematic diagram of the overall structure of the device;

[0022] Figure 1 is a schematic diagram of the overall structure of the device; Figure 6 Figure 1 is a schematic diagram of the overall structure of the device;

[0023] Figure 7 Figure 1 is a schematic diagram of the overall structure of the device; Figure 6 Figure 1 is a schematic diagram of the overall structure of the device;

[0024] Figure 8 Figure 1 is a schematic diagram of the overall structure of the device; DETAILED DESCRIPTION

[0025] The application will be further described below in conjunction with the drawings.

[0026] As shown in the drawings, an experimental platform for detecting the properties of rock-soil material, such as Figures 1 to 8 As shown in the drawings, an experimental platform for detecting the properties of rock-soil material, such as Figure 1 ​​​The rock-soil material compression resistance characteristic detection mechanism comprises a standard rock-soil material placing platform 17 on which a standard rock-soil material sample 15 cut into a standard disc shape is placed, and a pressure pushing head 15 capable of pushing down the rock-soil material sample 15;

[0027] The mechanism further comprises a micro-distance pushing mechanism capable of driving the pressure pushing head 15 to push down at a micro distance, the micro-distance pushing mechanism comprising a circular ring-shaped micro-distance lifting platform 19, and the pressure pushing head 15 is synchronous with the circular ring-shaped micro-distance lifting platform 19;

[0028] The mechanism further comprises a fixed-height outer gear ring 21 and a first universal ball pushing unit 100.1 and a second universal ball pushing unit 100.2 which are centrally symmetric relative to the axis of the outer gear ring 21, and the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 are synchronous with the outer gear ring 21;

[0029] The mechanism further comprises a central winding pile 9 coaxial with the outer gear ring 21, and a first traction rope 4.1 and a second traction rope 4.2 extending in the radial direction of the outer gear ring 21, the first traction rope 4.1 and the second traction rope 4.2 in the embodiment are made of high-strength carbon steel wire rope material; the two ends of the first traction rope 4.1 are respectively connected to the first universal ball pushing unit 100.1 and the central winding pile 9; the two ends of the second traction rope 4.2 are respectively connected to the second universal ball pushing unit 100.2 and the central winding pile 9;

[0030] The upper surface of the circular ring-shaped micro-distance lifting platform 19 is a ring-shaped universal ball running surface 7; the first universal ball 3.1 on the first universal ball pushing unit 100.1 and the second universal ball 3.2 on the second universal ball pushing unit 100.2 are in rolling fit with the ring-shaped universal ball running surface 7; the ring-shaped universal ball running surface 7 gradually increases in height in the centripetal direction;

[0031] In the process of the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 rotating synchronously with the outer gear ring 21, the first traction rope 4.1 and the second traction rope 4.2 are gradually wound on the central winding post 9, so that the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 rotate synchronously with the outer gear ring 21 and also make centripetal motion gradually close to the central winding post 9, thereby pushing the circular ring micro-distance lifting platform 19 to gradually descend. Since the gradualness of the ball running surface 7 gradually increasing in the centripetal direction can be arbitrarily designed, the unit pushing amount of the traditional screw pushing mode is affected by the minimum pitch, thereby avoiding that the actual pushing distance exceeds the minimum pushing distance required by the material being crushed due to the pushing speed being too fast, and making the compression condition of the rock-soil material sample 15 a relatively gradual and gentle process from the initial compression to the crushing, so that the state and change process of the soil material sample 15 under different pressures can be more objectively reflected.

[0032] The top fixed platform 8 is provided above the outer gear ring 21 and is fixedly connected with the standard rock-soil placing platform 17 through the support column 27; the cross beam 22 is fixedly arranged on the inner side of the outer gear ring 21 along the diameter direction, and the rotating shaft 23 coaxial with the outer gear ring 21 is fixed on the cross beam 22; the rotating shaft 23 is rotatably installed in the bearing hole on the top fixed platform 8 through the thrust bearing.

[0033] The motor 25 is installed on the top fixed platform 8, and the output gear 24 is drivingly connected with the output end of the motor 25 and is engaged with the outer gear ring 21.

[0034] A pair of vertical guide columns 12 are fixedly arranged on the lower side of the circular ring micro-distance lifting platform 19, and the vertical top pressing column 14 is fixedly connected with the lower end of the pair of vertical guide columns 12 through the connecting piece 13; the top pressing column 14 of the embodiment has a pressure sensor thereon, and the lower end of the top pressing column 14 is the pressure pushing head 15; the intermediate fixed platform 18 is arranged below the circular ring micro-distance lifting platform 19 and is fixed on the support column 27, and the intermediate fixed platform 18 has the vertical guide column passing hole 32 through which the vertical guide column 12 is movably passed; the support spring 11 is further sleeved on the vertical guide column 12, and the two support springs 11 elastically hold up the circular ring micro-distance lifting platform 19 upward, so that the first universal ball 3.1 and the second universal ball 3.2 always contact the annular universal ball running surface 7.

[0035] A pair of parallel horizontal guide rods 80 are parallelly arranged on the lower side of the cross beam 22, and the two ends of the horizontal guide rod 80 are fixedly connected with the cross beam 22 through the fixed seat 10; the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 can move along the horizontal guide rod 80.

[0036] The first universal ball pushing unit 100.1 comprises a first sliding block 1.1, one end of the first traction rope 4.1 is fixedly connected to the first sliding block 1.1 away from the center winding pile 9, two transverse guide rods 80 slide through two first guide holes 5.1 on the first sliding block 1.1, and the first universal ball pushing unit 100.1 further comprises a first universal ball seat 2.1 fixed on the lower side of the first sliding block 1.1, and the first universal ball seat 2.1 is rotatably installed with the first universal ball 3.1;

[0037] The second universal ball pushing unit 100.2 comprises a second sliding block 1.2, one end of the second traction rope 4.2 is fixedly connected to the second sliding block 1.2 away from the center winding pile 9, two transverse guide rods 80 slide through two second guide holes 5.2 on the second sliding block 1.2, and the second universal ball pushing unit 100.2 further comprises a second universal ball seat 2.2 fixed on the lower side of the second sliding block 1.2, and the second universal ball seat 2.2 is rotatably installed with the second universal ball 3.2; The transverse guide rod 80 is sleeved with a tension spring 80, and the two ends of the tension spring 80 elastically abut against the first sliding block 1.1 and the second sliding block 1.2; When the first traction rope 4.1 and the second traction rope 4.2 are not straight, the first sliding block 1.1 and the second sliding block 1.2 will move away from each other.

[0038] As shown in Figure 5 The center winding pile 9 is hollow 36, the lower end of the center winding pile 9 is fixedly connected with a lifting guide block 39, the two ends of the lifting guide block 39 are provided with vertical lifting guide holes 37, the middle fixed platform 18 is fixedly provided with a guide column seat 33, the guide column seat 33 is fixedly provided with a pair of longitudinal guide columns 28, and the pair of longitudinal guide columns 28 passes through the two lifting guide holes 37 on the lifting guide block 39; The upper end of the center winding pile 9 is fixedly connected with a screw nut 35, and further comprises a screw rod 34 matched with the screw nut 35, and the upper end of the screw rod 34 is fixedly connected with the cross beam 22; The rotation of the outer ring gear 21 drives the screw rod 34 to rotate through the cross beam 22, and the rotation of the screw rod 34 makes the center winding pile 9 displace downward on the basis of not rotating under the thread transmission and the guidance of the pair of longitudinal guide columns 28; So that the first traction rope 4.1 and the second traction rope 4.2 are spirally wound on the center winding pile 9 with a large enough spiral pitch 71, as shown in Figure 8 The first traction rope 4.1 and the second traction rope 4.2 are prevented from overlapping each other during winding on the center winding pile 9.

[0039] Working principle and working method:

[0040] In the initial state, the first and second universal ball pushing units 100.1 and 100.2 are in a relatively mutually far away state under the tension and relaxation force of the tension spring 80, and the first and second universal ball pushing units 100.1 and 100.2 are kept stable under the tension of the straightened first and second traction ropes 4.1 and 4.2; at the same time, under the action of the two supporting springs 11 elastically supporting the annular micro-distance lifting platform 19 upward, the first and second universal balls 3.1 and 3.2 always contact the annular universal ball walking surface 7 in the subsequent process;

[0041] When the pressure destruction experiment needs to be carried out, a rock-soil material standard sample 15 cut into a standard disc shape is prepared, the rock-soil material standard sample 15 is placed on the standard rock-soil placing platform 17, and the pressure pushing head 15 is located directly above the axial center of the rock-soil material standard sample 15;

[0042] At this time, the motor 25 is started to make the outer ring gear 21 and the cross beam 22 rotate synchronously, so that the transverse guide rod 80 drives the first and second universal ball pushing units 100.1 and 100.2 to rotate synchronously with the outer ring gear 21, and the first and second traction ropes 4.1 and 4.2 are gradually wound on the center winding pile 9, at the same time, the rotation of the outer ring gear 21 drives the screw rod 34 to rotate through the cross beam 22, and the rotation of the screw rod 34 makes the center winding pile 9 displace downward under the action of the screw thread transmission and the pair of longitudinal guide columns 28, so that the first and second traction ropes 4.1 and 4.2 are wound on the center winding pile 9 in a spiral shape with a large enough spiral pitch 71, as shown in Figure 8As shown, the mutual covering problem of the first traction rope 4.1 and the second traction rope 4.2 in the process of winding on the central winding stake 9 is avoided, so that the first traction rope 4.1 and the second traction rope 4.2 pull the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 respectively more uniformly to the direction close to the central winding stake 9, so that the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 make centripetal motion gradually close to the central winding stake 9 while synchronously rotating with the outer ring gear 21, which is equivalent to the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 making spiral motion in the form of an approximate Archimedes spiral in the top view, and since the annular universal ball running surface 7 gradually increases in height along the centripetal direction and the height of the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 is fixed, the first universal ball pushing unit 100.1 and the second universal ball pushing unit 100.2 gradually push the circular ring micro-distance lifting platform 19 to gradually descend in the form of micro-distance in the process of making spiral motion in the form of an Archimedes spiral in the top view, so that the pressure pushing head 15 gradually presses the rock-soil material sample 15 in the form of micro-distance feeding, and since the gradualness of the gradual increase in height of the ball running surface 7 along the centripetal direction can be arbitrarily designed, the unit pushing amount of the traditional screw pushing mode is affected by the minimum pitch, so that the actual pushing distance is avoided to exceed the minimum pushing distance required by the material being crushed, and at the same time, the pressure sensor detects the pressure on the pressure pushing head 15 in real time; until the rock-soil material sample 15 is crushed by the pressure pushing head 15; since the pressure pushing head 15 is micro-distance feeding, the pressure on the rock-soil material sample 15 is a relatively gradual and gentle process in the process from the initial pressure to the crushing of the rock-soil material sample 15, so that the state and change process of the soil material sample 15 under different pressures can be more objectively reflected.

[0043] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An experimental platform for detecting material properties of geotechnical materials, characterized in that: The micro-distance propulsion mechanism comprises a circular ring-shaped micro-distance lifting platform (19), and the pressure propulsion head (15) is synchronous with the circular ring-shaped micro-distance lifting platform (19); The first and second universal ball propulsion units (100.1 and 100.2) are centrally symmetrical relative to the axis of the outer gear ring (21) and are synchronous with the outer gear ring (21); The first and second traction ropes (4.1 and 4.2) extend along the radial direction of the outer gear ring (21); the two ends of the first traction rope (4.1) are connected with the first universal ball propulsion unit (100.1) and the central winding post (9) respectively; and the two ends of the second traction rope (4.2) are connected with the second universal ball propulsion unit (100.2) and the central winding post (9) respectively; The upper surface of the circular ring-shaped micro-distance lifting platform (19) is a ring-shaped universal ball walking surface (7); the first and second universal balls (3.1 and 3.2) on the first and second universal ball propulsion units (100.1 and 100.2) are in rolling fit with the ring-shaped universal ball walking surface (7); and the ring-shaped universal ball walking surface (7) gradually increases in height along the centripetal direction; During the synchronous rotation of the first and second universal ball propulsion units (100.1 and 100.2) with the outer gear ring (21), the first and second traction ropes (4.1 and 4.2) are gradually wound on the central winding post (9), so that the first and second universal ball propulsion units (100.1 and 100.2) rotate synchronously with the outer gear ring (21) and also move centripetally to gradually approach the central winding post (9), thereby gradually lowering the circular ring-shaped micro-distance lifting platform (19); The inner side of the outer gear ring (21) is fixed with a cross beam (22) along the diameter direction; and the lower side of the circular ring-shaped micro-distance lifting platform (19) is provided with an intermediate fixed platform (18) of a fixed height; and The center winding pile (9) is hollow (36), the lower end of the center winding pile (9) is fixedly connected with a lifting guide block (39), the two ends of the lifting guide block (39) are provided with vertical lifting guide holes (37), a guide column seat (33) is fixedly arranged on the middle fixed platform (18), a pair of longitudinal guide columns (28) are fixed on the guide column seat (33), and the pair of longitudinal guide columns (28) pass through the two lifting guide holes (37) on the lifting guide block (39); the upper end of the center winding pile (9) is fixedly connected with a screw nut (35), and a lead screw (34) matched with the screw nut (35) is further included, and the upper end of the lead screw (34) is fixedly connected with a cross beam (22); the rotation of the outer gear ring (21) drives the rotation of the lead screw (34) through the cross beam (22), and the rotation of the lead screw (34) makes the center winding pile (9) displace downward on the basis of not rotating under the thread transmission and the guidance of the pair of longitudinal guide columns (28).

2. The experimental platform for detecting material properties of geotechnical materials according to claim 1, characterized in that: The upper side of the outer gear ring (21) is provided with a top fixed platform (8), and the cross beam (22) is fixedly provided with a rotating shaft (23) coaxial with the outer gear ring (21); the rotating shaft (23) is rotatably installed in a bearing hole on the top fixed platform (8) through a thrust bearing.

3. The experimental platform for detecting material properties of geotechnical materials according to claim 2, characterized in that: The lower side of the circular ring micro-distance lifting platform (19) is fixedly provided with a pair of vertical guide columns (12), the lower ends of the pair of vertical guide columns (12) are fixedly connected with a vertical top pressing column (14) through a connecting piece (13), and the lower end of the top pressing column (14) is the pressure pushing head (15); the middle fixed platform (18) has a vertical guide column passing hole (32), the vertical guide column (12) movably passes through the guide column passing hole (32), and the vertical guide column (12) is further sleeved with a supporting spring (11), the two supporting springs (11) elastically hold up the circular ring micro-distance lifting platform (19) upward, so that the first universal ball (3.1) and the second universal ball (3.2) always contact the annular universal ball walking surface (7).

4. The experimental platform for detecting material properties of geotechnical materials according to claim 3, characterized in that: The lower side of the cross beam (22) is provided in parallel with a pair of parallel transverse guide rods (80), the two ends of the transverse guide rod (80) are fixedly connected with the cross beam (22) through a fixed seat (10); the first universal ball pushing unit (100.1) and the second universal ball pushing unit (100.2) can move along the transverse guide rod (80).

5. The experimental platform for detecting the material properties of rock-soil materials according to claim 4, characterized in that: The top pressing column (14) is provided with a pressure sensor.

6. The experimental platform for detecting material properties of geotechnical materials according to claim 5, characterized in that: An output gear (24) is further included, and the output gear (24) is engaged with the outer gear ring (21). An output gear (24) is further included, and the output gear (24) is engaged with the outer gear ring (21).

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