Full-automatic shear tester

Abstract

The invention relates to the technical field of rock soil shear tests, and particularly discloses a full-automatic shear tester which comprises an L-shaped supporting frame, a frame with an adjustable horizontal inclination angle and a shear box, the top end of the L-shaped supporting frame is provided with a collecting box used for collecting tested rock soil, and two hinge pieces are arranged between the top end of the L-shaped supporting frame and one end of the frame; the top end of the frame is provided with a pressurizing device used for pressing rock soil in the shearing box, the U-shaped frame is fixedly installed at the top end of the horizontal section of the L-shaped supporting frame, the side wall of the U-shaped frame is provided with an adjusting assembly used for adjusting the inclination angle of the frame, and limiting structures are arranged between the two vertical sections of the U-shaped frame and the frame. The device has an automatic inclined shear test function on rock and soil, improves the accuracy of rock and soil anti-shear test data, has an automatic rock and soil collection function after a shear test, and is more convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of rock and soil shear testing, and in particular to a full-automatic shear testing instrument. Background Art

[0002] Geotechnical shear test is an experimental method used to determine the shear strength of rock and soil. It is widely used in geotechnical engineering. According to different standards and regulations, shear test can be divided into many types, including direct shear test, on-site direct shear test, unconfined pressure test, etc.

[0003] The direct shear test is a method of measuring the shear strength of a specimen by applying a horizontal shear force to it under a fixed normal pressure. This test is usually used to measure the internal friction angle and cohesion of the soil, and to provide parameters for foundation bearing capacity calculations and foundation and slope stability analysis. The rock direct shear test is a method of measuring the shear strength parameters of the rock by performing horizontal shear under different normal loads. These parameters are important indicators for evaluating the stability of rock engineering.

[0004] During use, the fully automatic shear testers currently on the market are generally placed horizontally, so the shear box and specimens are subjected to vertical normal force and lateral shear force, while the rock and soil on the mountain and slope are located in an inclined position, resulting in inaccurate test data on the rock and soil shear resistance of mountain landslides and slope landslides. In addition, the rock and soil in the shear box need to be manually cleaned after each test, which makes it inconvenient to use. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a fully automatic shear tester, which can overcome the technical defects.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A fully automatic shear tester, comprising an L-shaped support frame, a frame with an adjustable horizontal tilt angle, and a shear box, wherein a collection box for collecting rock and soil after the test is provided at the top of the L-shaped support frame, two hinges are provided between the top of the L-shaped support frame and one end of the frame, and a pressurizing device for pressing the rock and soil in the shear box is provided at the top of the frame;

[0008] A U-shaped frame, wherein the U-shaped frame is fixedly mounted on the top of the horizontal section of the L-shaped support frame, the side wall of the U-shaped frame is provided with an adjustment component for adjusting the inclination angle of the frame, and a limiting structure is provided between the two vertical sections of the U-shaped frame and the frame;

[0009] An F-shaped frame, wherein the top ends of the two vertical sections of the F-shaped frame are fixedly mounted on the bottom end of the frame, and a driving mechanism for cooperating with the shear box to shear the rock and soil is arranged between the two F-shaped frames;

[0010] The shear box includes a first box body and a second box body, the first box body is fixedly installed in the frame, the second box body is slidably installed between two F-shaped frames, a first permeable stone is slidably installed between the opposite sides of the second box body, the sliding direction of the first permeable stone is the same as the axial direction of the frame, a support block is fixedly installed on the top of the first permeable stone, and a driving component for adjusting the position of the first permeable stone is provided on the side of the second box body away from the U-shaped frame.

[0011] Preferably, four supporting legs are provided at the bottom end of the L-shaped support frame, and a control cabinet is provided on one side of the vertical section of the L-shaped support frame.

[0012] Preferably, the pressurizing device includes a bracket, which is installed at the top of the frame, and a second hydraulic cylinder is arranged at the top of the horizontal section of the bracket, a first pressure sensor is installed at the bottom end of the piston rod of the second hydraulic cylinder, a first connecting block is installed at the bottom end of the first pressure sensor, a second permeable stone is installed at the bottom end of the first connecting block, and the second permeable stone is slidably installed in the shear box.

[0013] Preferably, the adjustment assembly includes a first hydraulic cylinder, a cylinder side wall of the first hydraulic cylinder is provided with a hinge seat, the bottom of the hinge seat is fixedly connected to the side wall of the horizontal section of the U-shaped frame, and a ball joint seat is provided between the bottom end of the piston rod of the first hydraulic cylinder and the end of the frame away from the hinge.

[0014] Preferably, the limiting structure includes a slider, and limiting grooves are provided on the outer sides of the two long axes of the frame, and the slider is slidably installed in the limiting grooves. The inner walls of the two vertical sections of the U-shaped frame are provided with sliding grooves, and the slider is slidably installed in the sliding grooves.

[0015] Preferably, the cross section of the limiting groove is arranged in a "convex" shape, and the sliding block includes a protrusion and a column.

[0016] Preferably, a plurality of rollers are arranged at the top of the horizontal section of the F-shaped frame through a receiving groove, and right-angle frames are arranged on the outer walls on both sides facing each other, and the horizontal sections of the right-angle frames are located at the tops of adjacent rollers.

[0017] Preferably, the driving assembly includes a servo motor, a U-shaped frame is fixedly installed on the side of the second box body away from the U-shaped frame, two limit rods are installed between the U-shaped frame and the second box body, the support block is slidably sleeved with the limit rods, a screw is rotatably installed between the U-shaped frame and the second box body, the support block is threadedly connected to the screw, the servo motor is fixedly installed on the side of the U-shaped frame away from the second box body, and the servo motor is fixedly connected to the screw through a coupling.

[0018] Preferably, the driving mechanism includes a third hydraulic cylinder, a support plate is fixedly installed between the horizontal sections of the two F-type frames, the third hydraulic cylinder is fixedly installed on the top of the support plate, a second pressure sensor is installed at the output end of the piston rod of the third hydraulic cylinder, and a second connecting block is installed between the second pressure sensor and the outer wall of the second box body.

[0019] Preferably, two notches are provided at the bottom end of the second box body, and the first permeable stone matches the notches.

[0020] The beneficial effects of the present invention are:

[0021] 1. By setting up an L-shaped support frame and a frame, the beneficial effect that can be obtained is that a collection box for collecting rock and soil after the test is arranged at the top of the L-shaped support frame, two hinges are arranged between the top of the L-shaped support frame and one end of the frame, a pressurizing device for pressing the rock and soil in the shear box is arranged at the top of the frame, the first box body is fixedly installed in the frame, the second box body is slidably installed between the two F-shaped frames, and the first permeable stone is slidably installed between the opposite sides of the second box body, and the sliding direction of the first permeable stone is the same as the axial direction of the frame;

[0022] The inclination of the hillside or slope is input into the control cabinet, and the rock and soil are placed between the first box body and the second box body. Then, the first hydraulic cylinder cooperates with the hinge seat and the ball joint seat to adjust the inclination angle of the frame to match the inclination of the hillside or slope. During the rotation of the frame and the hinge at the top of the L-shaped support frame, the slider slides in the limit groove of the frame, and the slider slides in the slide groove of the vertical section of the U-shaped frame, thereby improving the stability of the frame inclination angle adjustment process. Then, the second hydraulic cylinder cooperates with the first pressure sensor and the first connecting block to drive the second permeable stone to slide in the shear box, applying normal pressure to the rock and soil. The first pressure sensor monitors the normal pressure. At the same time, the third hydraulic cylinder cooperates with the second pressure sensor and the second connecting block to drive the second box body, and the second box body slides on the rollers at the top of the two F-shaped frames. The second pressure sensor cooperates with the control cabinet to obtain the shear stress when the rock and soil are sheared, which is the shear strength. It has the function of automatic inclined shear test on rock and soil, thereby improving the accuracy of rock and soil shear test data.

[0023] By setting the driving assembly, the beneficial effect that can be obtained is that a U-shaped frame is fixedly installed on the side of the second box body away from the U-shaped frame, two limit rods are installed between the U-shaped frame and the second box body, the support block and the limit rod are slidably sleeved, a screw is rotatably installed between the U-shaped frame and the second box body, the support block and the screw are threadedly connected, the servo motor is fixedly installed on the side of the U-shaped frame away from the second box body, and the servo motor is fixedly connected to the screw through a coupling;

[0024] After completing the shear strength test, the third hydraulic cylinder cooperates with the second pressure sensor and the second connecting block to drive the second box body to reset, the servo motor drives the screw to rotate, driving the support block to slide between the two limit rods, and the first permeable stone slides at the bottom of the second box body to cancel the limit on the rock and soil. The second hydraulic cylinder cooperates with the first pressure sensor and the first connecting block to drive the second permeable stone to slide in the shear box, pushing the sheared rock and soil out of the shear box and dropping it into the collection box. It has the function of automatically collecting rock and soil after the shear test, and is more convenient to use.

[0025] 3 By setting the limiting structure, the beneficial effect that can be obtained is that the outer sides of the two long axes of the frame are provided with limiting grooves, the slider is slidably installed in the limiting grooves, and the inner walls of the two vertical sections of the U-shaped frame are provided with sliding grooves, and the slider is slidably installed in the sliding grooves;

[0026] When the frame cooperates with the hinge to rotate at the top of the L-shaped support frame, the slider slides in the limit groove of the frame, and the slider slides in the slide groove of the vertical section of the U-shaped frame, thereby improving the stability of the frame tilt angle adjustment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a diagram of the installation structure of the L-shaped support frame and the collection box in the present invention;

[0030] Figure 3 This is a structural diagram of the ball joint seat of the present invention;

[0031] Figure 4 It is the installation structure diagram of the frame and the shear box in the present invention;

[0032] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0033] Figure 6 The bumps and columns of the present invention;

[0034] Figure 7 It is the installation structure diagram of the driving mechanism in the present invention;

[0035] Figure 8 It is the installation structure diagram of the driving assembly in the present invention;

[0036] Fig. 9 This is a diagram of the installation structure of the second box body and the first permeable stone in the present invention;

[0037] Fig.10It is the installation structure diagram of the pressurizing device in the present invention.

[0038] Description of reference numerals:

[0039] In the figure: 1. L-shaped support frame; 11. collection box; 12. support foot; 13. control cabinet; 2. frame; 21. hinge; 22. limit groove; 23. slide block; 3. U-shaped frame; 31. first hydraulic cylinder; 32. hinge seat; 33. ball joint seat; 34. slide groove; 4. F-shaped frame; 41. roller; 5. shear box; 51. first box body; 52. second box body; 53. first permeable stone; 54. support block; 55. right-angle frame; 61. U-shaped frame; 62. limit rod; 63. screw; 64. servo motor; 71. bracket; 72. second hydraulic cylinder; 73. first pressure sensor; 74. first connecting block; 75. second permeable stone; 81. support plate; 82. third hydraulic cylinder; 83. second pressure sensor; 84. second connecting block; 91. bump; 92. column. DETAILED DESCRIPTION

[0040] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are clearly and completely described below in combination with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present application, it should be understood that the orientation or position relationship indicated by "inside", "outside", etc. is based on the orientation or position described in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as a limitation on the present application.

[0042] Reference Figure 1-Figure 10, is a fully automatic shear tester disclosed in the present invention, comprising an L-shaped support frame 1, a frame 2 with an adjustable horizontal tilt angle and a shear box 5, a collection box 11 for collecting rock and soil after the test is arranged at the top of the L-shaped support frame 1, four supporting legs 12 are arranged at the bottom of the L-shaped support frame 1, a control cabinet 13 is arranged on one side of the vertical section of the L-shaped support frame 1, two hinges 21 are arranged between the top of the L-shaped support frame 1 and one end of the frame 2, a pressurizing device for pressing the rock and soil in the shear box 5 is arranged at the top of the frame 2, the pressurizing device comprises a bracket 71, the bracket 71 is installed at the top of the frame 2, a second hydraulic cylinder 72 is arranged at the top of the horizontal section of the bracket 71, a first pressure sensor 73 is installed at the bottom end of the piston rod of the second hydraulic cylinder 72, a first connecting block 74 is installed at the bottom end of the first pressure sensor 73 and the first connecting block 74, a second permeable stone 75 is installed at the bottom end of the first connecting block 74, and the second permeable stone 75 is slidably installed in the shear box 5.

[0043] The U-shaped frame 3 is fixedly installed on the top of the horizontal section of the L-shaped support frame 1. The side wall of the U-shaped frame 3 is provided with an adjustment component for adjusting the inclination angle of the frame 2. The adjustment component includes a first hydraulic cylinder 31. The side wall of the cylinder body of the first hydraulic cylinder 31 is provided with an articulated seat 32. The bottom of the articulated seat 32 is fixedly connected to the side wall of the horizontal section of the U-shaped frame 3. A ball joint seat 33 is provided between the bottom end of the piston rod of the first hydraulic cylinder 31 and the end of the frame 2 away from the hinge 21. A limiting structure is provided between the two vertical sections of the U-shaped frame 3 and the frame 2. The limiting structure includes a slider 23. The frame 2 are provided with limit grooves 22 on the outer sides of the two long axes, and the slider 23 is slidably installed in the limit grooves 22. The inner walls of the two vertical sections of the U-shaped frame 3 are provided with slide grooves 34. The slider 23 is slidably installed in the slide grooves 34. The cross-section of the limit groove 22 is set in a "convex" shape. The slider 23 includes a protrusion 91 and a column 92. During the rotation of the frame 2 at the top of the L-shaped support frame 1 in cooperation with the hinge 21, the slider 23 slides in the limit groove 22 of the frame 2, and the slider 23 slides in the slide groove 34 of the vertical section of the U-shaped frame 3, thereby improving the stability of the frame 2 during the adjustment of the tilt angle.

[0044] F-type frame 4, the top ends of the two vertical sections of the F-type frame 4 are fixedly installed at the bottom end of the frame 2, a plurality of rollers 41 are arranged at the top end of the horizontal section of the F-type frame 4 through a receiving groove, a driving mechanism for cooperating with the shear box 5 to shear the rock and soil is arranged between the two F-type frames 4, the driving mechanism includes a third hydraulic cylinder 82, a support plate 81 is fixedly installed between the horizontal sections of the two F-type frames 4, the third hydraulic cylinder 82 is fixedly installed at the top end of the support plate 81, a second pressure sensor 83 is installed at the output end of the piston rod of the third hydraulic cylinder 82, and a second connecting block 84 is installed between the second pressure sensor 83 and the outer wall of the second box body 52, so as to complete the shear strength After the degree is reached, the first hydraulic cylinder 31 cooperates with the articulated seat 32 and the ball joint seat 33 to adjust the frame 2 to a horizontal position, the third hydraulic cylinder 82 cooperates with the second pressure sensor 83 and the second connecting block 84 to drive the second box body 52 to reset, the servo motor 64 drives the screw 63 to rotate, driving the support block 54 to slide between the two limit rods 62, the first permeable stone 53 slides at the bottom of the second box body 52, canceling the limit on the rock and soil, the second hydraulic cylinder 72 cooperates with the first pressure sensor 73 and the first connecting block 74 to drive the second permeable stone 75 to slide in the shear box 5, and pushes the sheared rock and soil out of the shear box 5 and drops it into the collection box 11.

[0045] The shear box 5 includes a first box body 51 and a second box body 52. ​​The first box body 51 is fixedly installed in the frame 2, and the second box body 52 is slidably installed between the two F-shaped frames 4. A first permeable stone 53 is slidably installed between the opposite sides of the second box body 52. ​​The sliding direction of the first permeable stone 53 is the same as the axial direction of the frame 2. A support block 54 is fixedly installed on the top of the first permeable stone 53. The outer walls of the opposite sides of the second box body 52 are both provided with right-angle frames 55. The horizontal section of the right-angle frame 55 is located at the top of the adjacent roller 41. The side of the second box body 52 away from the U-shaped frame 3 is provided with a support block 54 for A driving assembly for adjusting the position of the first permeable stone 53 includes a servo motor 64. A U-shaped frame 61 is fixedly installed on the side of the second box body 52 away from the U-shaped frame 3. Two limit rods 62 are installed between the U-shaped frame 61 and the second box body 52. ​​The support block 54 and the limit rod 62 are slidably connected. A screw 63 is rotatably installed between the U-shaped frame 61 and the second box body 52. ​​The support block 54 and the screw 63 are threadedly connected. The servo motor 64 is fixedly installed on the side of the U-shaped frame 61 away from the second box body 52. ​​The servo motor 64 is fixedly connected to the screw 63 through a coupling.

[0046] The working principle and use process of the present invention are as follows: the inclination of the hillside or slope is input into the control cabinet 13, and the rock and soil are placed between the first box body 51 and the second box body 52. ​​Then, the first hydraulic cylinder 31 cooperates with the hinge seat 32 and the ball joint seat 33 to adjust the inclination angle of the frame 2 to match the inclination of the hillside or slope. During the rotation of the frame 2 at the top of the L-shaped support frame 1 in cooperation with the hinge 21, the slider 23 slides in the limit groove 22 of the frame 2, and the slider 23 slides in the slide groove 34 of the vertical section of the U-shaped frame 3, thereby improving the stability of the inclination angle adjustment process of the frame 2. Then, the second hydraulic cylinder 72 cooperates with the first pressure sensor 73 and the first connecting block 74 to drive the second permeable stone 75 to slide in the shear box 5, applying normal pressure to the rock and soil, and the first pressure sensor 73 monitors the normal pressure. At the same time, the third hydraulic cylinder 82 cooperates with the second pressure sensor 83 and the second connecting block 74 to drive the second permeable stone 75 to slide in the shear box 5, applying normal pressure to the rock and soil, and the first pressure sensor 73 monitors the normal pressure. At the same time, Block 84 drives the second box body 52, and the second box body 52 slides on the rollers 41 at the top of the two F-type frames 4. The second pressure sensor 83 cooperates with the control cabinet 13 to obtain the shear stress when the rock and soil are sheared, which is the shear strength. After the shear strength is completed, the first hydraulic cylinder 31 cooperates with the hinge seat 32 and the ball joint seat 33 to adjust the frame 2 to a horizontal position. The third hydraulic cylinder 82 cooperates with the second pressure sensor 83 and the second connecting block 84 to drive the second box body 52 to reset. The servo motor 64 drives the screw 63 to rotate, driving the support block 54 to slide between the two limit rods 62. The first permeable stone 53 slides at the bottom of the second box body 52 to cancel the limit on the rock and soil. The second hydraulic cylinder 72 cooperates with the first pressure sensor 73 and the first connecting block 74 to drive the second permeable stone 75 to slide in the shear box 5, and the sheared rock and soil are pushed out of the shear box 5 and fall into the collection box 11.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. Fully automatic shear tester, characterized in that: include: An L-shaped support frame (1), a frame (2) with an adjustable horizontal tilt angle, and a shear box (5), wherein the top of the L-shaped support frame (1) is provided with a collection box (11) for collecting rock and soil after the test, two hinges (21) are provided between the top of the L-shaped support frame (1) and one end of the frame (2), and the top of the frame (2) is provided with a pressurizing device for pressing the rock and soil in the shear box (5); A U-shaped frame (3), the U-shaped frame (3) being fixedly mounted on the top of the horizontal section of the L-shaped support frame (1), the side wall of the U-shaped frame (3) being provided with an adjustment component for adjusting the inclination angle of the frame (2), and a limiting structure being provided between the two vertical sections of the U-shaped frame (3) and the frame (2); An F-shaped frame (4), wherein the top ends of the two vertical sections of the F-shaped frame (4) are fixedly mounted on the bottom end of the frame (2), and a driving mechanism for cooperating with the shear box (5) to shear rock and soil is provided between the two F-shaped frames (4); The shear box (5) comprises a first box body (51) and a second box body (52), wherein the first box body (51) is fixedly installed in the frame (2), and the second box body (52) is slidably installed between two F-shaped frames (4). A first permeable stone (53) is slidably installed between two opposite sides of the second box body (52), and the sliding direction of the first permeable stone (53) is the same as the axial direction of the frame (2). A support block (54) is fixedly installed on the top of the first permeable stone (53), and a driving component for adjusting the position of the first permeable stone (53) is provided on a side of the second box body (52) away from the U-shaped frame (3).

2. The fully automatic shear tester according to claim 1, characterized in that: Four supporting legs (12) are arranged at the bottom end of the L-shaped support frame (1), and a control cabinet (13) is arranged on one side of the vertical section of the L-shaped support frame (1).

3. The fully automatic shear tester according to claim 1, characterized in that: The pressurizing device comprises a bracket (71), wherein the bracket (71) is mounted on the top of the frame (2), a second hydraulic cylinder (72) is arranged at the top of the horizontal section of the bracket (71), a first pressure sensor (73) is mounted at the bottom end of the piston rod of the second hydraulic cylinder (72), a first connecting block (74) is mounted at the bottom end of the first pressure sensor (73), a second permeable stone (75) is mounted at the bottom end of the first connecting block (74), and the second permeable stone (75) is slidably mounted in the shear box (5).

4. The fully automatic shear tester according to claim 1, characterized in that: The adjustment assembly comprises a first hydraulic cylinder (31), a cylinder body side wall of the first hydraulic cylinder (31) is provided with an articulated seat (32), the bottom of the articulated seat (32) is fixedly connected to the side wall of the horizontal section of the U-shaped frame (3), and a ball joint seat (33) is provided between the bottom end of the piston rod of the first hydraulic cylinder (31) and an end of the frame (2) away from the articulated member (21).

5. The fully automatic shear tester according to claim 1, characterized in that: The limiting structure comprises a slider (23), the outer sides of the two long axes of the frame (2) are both provided with limiting grooves (22), the slider (23) is slidably installed in the limiting grooves (22), the inner walls of the two vertical sections of the U-shaped frame (3) are both provided with sliding grooves (34), the slider (23) is slidably installed in the sliding grooves (34).

6. The fully automatic shear tester according to claim 5, characterized in that: The cross section of the limiting groove (22) is arranged in a "convex" shape, and the sliding block (23) comprises a convex block (91) and a column (92).

7. The fully automatic shear tester according to claim 1, characterized in that: A plurality of rollers (41) are arranged at the top of the horizontal section of the F-shaped frame (4) through a receiving groove, and right-angle frames (55) are arranged on the outer walls on both sides facing each other of the second box body (52), and the horizontal sections of the right-angle frames (55) are located at the tops of adjacent rollers (41).

8. The fully automatic shear tester according to claim 1, characterized in that: The driving assembly comprises a servo motor (64); a U-shaped frame (61) is fixedly installed on a side of the second box body (52) away from the U-shaped frame (3); two limit rods (62) are installed between the U-shaped frame (61) and the second box body (52); the support block (54) and the limit rods (62) are slidably sleeved; a screw rod (63) is rotatably installed between the U-shaped frame (61) and the second box body (52); the support block (54) and the screw rod (63) are threadedly connected; the servo motor (64) is fixedly installed on a side of the U-shaped frame (61) away from the second box body (52); and the servo motor (64) is fixedly connected to the screw rod (63) via a coupling.

9. The fully automatic shear tester according to claim 1, characterized in that: The driving mechanism comprises a third hydraulic cylinder (82), a support plate (81) is fixedly installed between the horizontal sections of the two F-shaped frames (4), the third hydraulic cylinder (82) is fixedly installed on the top of the support plate (81), a second pressure sensor (83) is installed at the output end of the piston rod of the third hydraulic cylinder (82), and a second connecting block (84) is installed between the second pressure sensor (83) and the outer wall of the second box body (52).

10. The fully automatic shear tester according to claim 1, characterized in that: The bottom end of the second box body (52) is provided with two notches, and the first permeable stone (53) matches the notches.

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