Rock double-sided shear test device matched with press machine

Abstract

The utility model provides a rock double-sided shear test device matched with a press machine, which is used in the technical field of rock mechanics test and comprises a normal pressurization system and a shear system, the normal pressurizing system comprises a base, a magnetic frame, a normal pressurizing jack, a positioning column and a positioning ball; the shearing system comprises a lower fixed die, an upper fixed die, a shearing die, a normal fixed cushion block, a fixed die inner ring and a shearing die inner ring. The device is simple in structure, high in mounting precision and small in occupied space, can be matched with a press machine to complete a rock double-sided shear test, and has important significance on an indoor rock test.

Description

Technical Field

[0001] This utility model belongs to the field of rock mechanics testing technology, specifically relating to a rock double-sided shear test device that works in conjunction with a press. Background Technology

[0002] Rock shear testing is an important testing technique in engineering geology, designed to determine the shear strength of rocks and rock masses. This test is crucial for understanding the mechanical properties of rocks and assessing the stability and safety of rock engineering projects. The maximum ability of a rock to resist shear failure is called its shear strength, providing important scientific evidence and technical support for fields such as civil engineering, geological engineering, and mining engineering.

[0003] To determine the shear strength of rock, different normal loads are applied to five or more test blocks. Horizontal shear force is applied using the push method until the test blocks are sheared to failure. The shear strength parameters are obtained using the Mohr's circle of stress and the Coulomb's internal friction angle formula.

[0004] Currently, indoor rock shear tests in laboratories are typically conducted using a direct shear apparatus. The direct shear apparatus is a large piece of equipment, featuring both a horizontal loading system for applying shear force to the specimen and a normal loading system for applying normal loads. Its large size means that some small laboratories cannot accommodate both a press and a direct shear apparatus simultaneously, impacting daily production efficiency. Therefore, researching a rock double-sided shear testing device that works in conjunction with a press can effectively save floor space and is of great significance for ensuring production efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a rock double-sided shear test device that works in conjunction with a press, which can effectively solve the aforementioned problems.

[0006] The technical solution adopted in this utility model is as follows:

[0007] This utility model provides a rock double-sided shear test device that works with a press, including a normal pressurization system and a shearing system;

[0008] The normal pressurization system includes: a base (1), a magnetic frame (4), a normal pressurization jack (5), a positioning column (7), and a positioning bead (14); the shearing system includes a lower fixed mold (3), an upper fixed mold (8), a shearing mold (10), a normal fixed pad (15), a fixed mold inner ring (16), and a shearing mold inner ring (17);

[0009] The base (1) has a lower fixing mold (3) symmetrically fixed on each side of its surface, and an upper fixing mold (8) shaped like an upper arch bridge is fixed on the top of each lower fixing mold (3). The upper fixing mold (8) and the lower fixing mold (3) form an arched circle. An inner ring (16) of the fixing mold is provided inside the arched circle.

[0010] Between the lower fixed molds (3) on both sides, the shearing mold (10) is suspended. The shearing mold (10) has a cylindrical hole with the same diameter as the arched circle. The cylindrical hole is coaxial with the arched circle, and the inner ring (17) of the shearing mold is provided in the cylindrical hole.

[0011] The inner diameter of the shearing die inner ring (17) and the two sides of the fixed die inner ring (16) is the same as the diameter of the test block (18). The center of the test block (18) is placed in the shearing die inner ring (17). The two ends of the test block (18) are each fitted into the corresponding side of the fixed die inner ring (16), and the normal fixing pad (15) is embedded in the fixed die inner ring (16) on each side, so that the inner side of the normal fixing pad (15) fits against the end face of the test block (18); the outer center of the normal fixing pad (15) has a recess.

[0012] On the outer sides of the lower fixing mold (3) on both sides, a magnetic frame (4) is provided; the magnetic frame (4) on one side is equipped with the positioning post (7), the inner end of the positioning post (7) is fixed with the positioning bead (14), and the positioning bead (14) rests against the recess of the normal fixing pad (15) on the same side; the magnetic frame (4) on the other side is equipped with the normal pressure jack (5), the output end of the normal pressure jack (5) is fixed with another positioning bead (14), and the other positioning bead (14) rests against the recess of the normal fixing pad (15) on the same side.

[0013] Preferably, the base (1) is a cuboid and is placed horizontally at the center of the press.

[0014] Preferably, two base handles (2) are provided on each side of the base (1); each base handle (2) is threadedly connected to the base (1).

[0015] Preferably, the normal pressure jack (5) has a hand pump interface (6) on one side.

[0016] Preferably, the positioning post (7) is cylindrical and is threadedly connected to the magnetic frame (4).

[0017] Preferably, the upper fixed mold (8) and the lower fixed mold (3) are connected and fixed by hexagonal bolts (9).

[0018] Preferably, the shearing system further includes a displacement measuring device (11), a dial indicator (12), and a spherical base (13);

[0019] The displacement measuring device (11) is disposed on the top of the shearing mold (10); the spherical seat (13) is disposed on the top surface of the displacement measuring device (11); and a dial gauge (12) is disposed on each side of the displacement measuring device (11).

[0020] Preferably, the magnetic base of the dial indicator (12) is magnetically connected to the magnetic frame (4).

[0021] The rock double-sided shear test device provided by this utility model, which is used in conjunction with a press, has the following advantages:

[0022] This invention makes the experiment easier to operate, and the device adopts a mechanical design to make the results more accurate.

[0023] Laboratory equipment is usually equipped with a press. Therefore, the rock double-sided shear test device proposed in this invention, which is used in conjunction with a press, greatly reduces the space required in the laboratory compared with the traditional direct shear tester because it does not require a separate horizontal shear force loading system.

[0024] This invention reduces systematic errors in testing by welding a portion of the fixed mold to the base plate, thereby increasing the strength and rigidity of the fixed mold. Attached Figure Description

[0025] Figure 1 A perspective view of a rock double-sided shear test device that is used in conjunction with a press, provided by this utility model;

[0026] Figure 2 A top view of a rock double-sided shear test device that is used in conjunction with a press, provided by this utility model;

[0027] Figure 3 for Figure 2 Sectional view along AA;

[0028] Figure 4 for Figure 2 A cross-sectional view along BB;

[0029] Figure 5 A partial perspective view of a rock double-sided shear test device that is used in conjunction with a press, provided by this utility model.

[0030] In the diagram: 1-Base; 2-Base handle; 3-Lower fixed mold; 4-Magnetic frame; 5-Normal pressure jack; 6-Hand pump interface; 7-Positioning column; 8-Upper fixed mold; 9-Hex bolt; 10-Shearing mold; 11-Displacement measuring device; 12-Dial indicator; 13-Spherical seat; 14-Positioning bead; 15-Normal fixed pad; 16-Inner ring of fixed mold; 17-Inner ring of shearing mold; 18-Test block. Detailed Implementation

[0031] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0032] The implementation of this utility model is not limited by specific dimensions or materials, but can be adjusted and varied according to specific circumstances. Any modifications to the implementation method, component form, and materials of this testing and verification device, as long as these modifications and variations follow the basic structural composition of this utility model, fall within the protection scope of this utility model.

[0033] See Figures 1 to 5 This utility model provides a rock double-sided shear test device that works with a press, including a normal pressurization system and a shear system;

[0034] The normal pressure system includes: a base 1, a magnetic frame 4, a normal pressure jack 5, a positioning column 7, and a positioning bead 14; the shearing system includes a lower fixed mold 3, an upper fixed mold 8, a shearing mold 10, a normal fixed pad 15, a fixed mold inner ring 16, and a shearing mold inner ring 17.

[0035] The base 1 is a cuboid, placed horizontally at the center of the press; two base handles 2 are provided on each side of the base 1; each base handle 2 is threadedly connected to the base 1; a lower fixed mold 3 in the shape of a lower arch bridge is fixedly fixed on each side of the surface of the base 1; an upper fixed mold 8 in the shape of an upper arch bridge is fixedly fixed on the top of each lower fixed mold 3, and the upper fixed mold 8 and the lower fixed mold 3 form an arched circle; an inner ring 16 of the fixed mold is provided inside the arched circle;

[0036] Between the lower fixed molds 3 on both sides, the shearing mold 10 is suspended. The shearing mold 10 has a cylindrical hole with the same diameter as the arched circle. The cylindrical hole is coaxial with the arched circle, and the inner ring 17 of the shearing mold is provided in the cylindrical hole.

[0037] The inner diameters of the shearing die inner ring 17 and the two side fixed die inner rings 16 are the same as the diameter of the test block 18. The center of the test block 18 is placed in the shearing die inner ring 17. Each end of the test block 18 is fitted into the corresponding side fixed die inner ring 16, and the normal fixing pad 15 is embedded in the fixed die inner ring 16 on each side, so that the inner side of the normal fixing pad 15 is in contact with the end face of the test block 18; the outer center of the normal fixing pad 15 has a recess.

[0038] On the outer sides of the lower fixing mold 3 on both sides, a magnetic frame 4 is provided. On one side, the magnetic frame 4 is fitted with a positioning post 7, and a positioning bead 14 is fixed to the inner end of the positioning post 7. The positioning bead 14 rests against the recess of the normal fixing pad 15 on the same side. The positioning post 7 is cylindrical and threadedly connected to the magnetic frame 4. On the other side, the magnetic frame 4 is fitted with a normal pressure jack 5. Another positioning bead 14 is fixed to the output end of the normal pressure jack 5, and this other positioning bead 14 rests against the recess of the normal fixing pad 15 on the same side. The normal pressure jack 5 has a hand pump interface 6 on one side.

[0039] The shearing system also includes a displacement measuring device 11, a dial indicator 12, and a spherical base 13;

[0040] The displacement measuring device 11 is disposed on the top of the shearing mold 10; the spherical base 13 is disposed on the top surface of the displacement measuring device 11; a dial indicator 12 is disposed on each side of the displacement measuring device 11. The magnetic base of the dial indicator 12 is magnetically connected to the magnetic frame 4.

[0041] The following is an example:

[0042] This utility model provides a rock double-sided shear test device that works with a press, as shown in the figure. The device mainly consists of a normal pressurization system and a shearing system. The normal pressurization system includes: a base 1, a base handle 2, a magnetic frame 4, a normal pressurization jack 5, a hand pump interface 6, a positioning column 7, and a positioning bead 14. The shearing system includes: a lower fixed mold 3, an upper fixed mold 8, a hexagonal bolt 9, a shearing mold 10, a displacement measuring device 11, a dial indicator 12, a spherical seat 13, a normal fixing pad 15, an inner ring of the fixed mold 16, and an inner ring of the shearing mold 17.

[0043] The base 1 of the normal pressurization system is a cuboid made of high-hardness stainless steel. It is placed horizontally in the center of the press and its surface is coated with lubricating oil to reduce friction with the magnetic frame 4. The two ends of the two wide faces of the cuboid are provided with threaded holes, and two shearing system lower fixing molds 3 are welded to the surface.

[0044] The normal pressurization system has four base handles 2 in total. One end of each base handle 2 is threaded and connects to the threaded hole of the base 1 of the normal pressurization system. The outer end is designed to be easy to hold with both hands to adjust the position of the base 1 on the press.

[0045] The magnetic frame 4 of the normal pressure system is made of magnetic material and can be magnetically attracted by the magnetic base of the dial indicator 12 of the shearing system. One end of the frame has a threaded hole, and the other end has a normal pressure jack 5 of the normal pressure system in its center. It is placed on the base 1 of the normal pressure system.

[0046] The normal pressurization system includes a normal pressurization jack 5, with a positioning bead 14 embedded in the center, which matches the recess of the normal fixing pad 15 of the shearing system. A hand pump interface 6 for the normal pressurization system is located on one side.

[0047] The positioning post 7 of the normal pressurization system is cylindrical, with a thread at one end, which connects to the magnetic frame 4 of the normal pressurization system. A positioning bead 14 is embedded in the middle of the other end, which matches the recess of the normal fixing pad 15 of the shearing system.

[0048] The normal pressure system has two positioning beads 14, which are respectively embedded in the normal pressure jack 5 and the positioning column 7 of the normal pressure system. When normal pressure is applied, they can match the recess of the normal fixing pad 15 of the shearing system to fix the test block.

[0049] The lower fixed mold 3 of the shearing system consists of two arched bridge-shaped molds, which are welded to the fixed position of the base 1 of the normal pressure system. Each lower fixed mold 3 has threaded holes near its four corners, and to ensure stability, the thread directions are opposite to each other.

[0050] The upper fixing mold 8 of the shearing system consists of two arched molds, with the same dimensions as the lower fixing mold 3 of the shearing system. Each upper fixing mold 8 has four through threaded holes, which are located in the same positions as the lower fixing mold 3 of the shearing system.

[0051] The shearing system has eight hexagonal bolts 9, which cooperate with the upper fixed mold 8 and the lower fixed mold 3 of the shearing system.

[0052] The shearing die 10 of the shearing system is a cuboid with a hollowed-out cylinder inside. It can be placed between the two lower fixed dies 3 of the shearing system with a small gap. The diameter of the hollowed-out cylinder is the same as the diameter of the arched cylinder of the upper fixed die 8 and the lower fixed die 3 of the shearing system. During the test, the hollowed-out cylinder contains the inner ring 17 of the shearing die of the shearing system and the test block. Since the test block is placed in the center between the inner ring 17 of the shearing die of the shearing system and the inner rings 16 of the two fixed dies, the shearing die 10 can be suspended in the air.

[0053] The displacement measuring device 11 of the shearing system has a groove at its bottom, allowing the shearing mold 10 of the shearing system to be placed inside the groove. Its top is used to place a spherical seat 13 for use with a press. Metal plates are horizontally welded to each side for mounting a dial indicator 12 of the shearing system to measure the displacement value of the test block in the shearing mold 10 during the shearing test.

[0054] The shearing system has two normal fixing pads 15, one end of which has a recess that matches the positioning beads 14 of the two normal pressure systems. The diameter of the cylindrical part at the other end is the same as that of the test block.

[0055] The shearing system has two inner rings 16 of the fixed mold. The outer diameter of the inner ring is the same as the arch-shaped circle diameter of the upper fixed mold 8 and the lower fixed mold 3 of the shearing system, and the inner diameter is the same as that of the test block.

[0056] The outer diameter of the inner ring 17 of the shearing die of the shearing system is the same as the circular diameter of the shearing die 10 of the shearing system, and the inner diameter is the same as that of the test block.

[0057] This utility model provides a method for using a rock double-sided shear test device in conjunction with a press, comprising the following steps:

[0058] Step 1: Hold the base handle 2 and place the base 1 on the press, and adjust its position so that the center of the two lower fixed dies 3 on the base 1 is aligned with the center of the press.

[0059] Step 2: Place the magnetic frame 4 on the base 1, connect the hand pump to the hand pump interface 6, and adjust the position so that the center of the normal pressure jack 5, the positioning bead 14 on the positioning column 7 and the two lower fixed molds 3 are collinear.

[0060] Step 3: Place the inner ring 17 of the shearing die 10 inside the shearing die 10, and then place the test block in it, positioning the shearing die 10 at the exact center of the test block. Next, attach the inner rings 16 of the fixing die 16 to both sides of the test block, and place the normal fixing pads 15 into the inner rings 16 on both sides, ensuring the non-recessed sides of the pads align with the bottom and top surfaces of the test block. Finally, transfer all the molds and the test block into the lower fixing die 3, at which point the shearing die 10 is suspended in mid-air. Adjust the position again so that the inner ring 16 of the fixing die 16 is in the exact center of the lower fixing die 3, and the inner ring 17 of the shearing die 10 is in the exact center of the shearing die 10.

[0061] Step 4: Align the two upper fixed molds 8 with the lower fixed mold 3 and tighten the hex bolts 9 to secure them. Then use a wrench to tighten the positioning pin 7 so that the positioning bead 14 on it fits into the recess of the normal fixing pad 15.

[0062] Step 5: Place the displacement measuring device 11 on the shear mold 10, place the spherical seat 13 on it, and set up dial gauges 12 on both sides. Attach the magnetic base of the dial gauges 12 to the magnetic frame 4. Use a hand pump to apply normal stress so that the positioning beads 14 on the dial gauges 11 fit into the recesses of the normal fixing pads 15. Then start the press to apply a horizontal shear force and begin recording the values ​​of the dial gauges 12 and the corresponding press readings to complete the test. This concludes the installation and usage procedure of the rock double-sided shear test device and its application method provided by this invention.

[0063] The rock double-sided shear test device provided by this utility model, which is used in conjunction with a press, has the following advantages:

[0064] This invention makes the experiment easier to operate, and the device adopts a mechanical design to make the results more accurate.

[0065] Laboratory equipment is usually equipped with a press. Therefore, the rock double-sided shear test device proposed in this invention, which is used in conjunction with a press, greatly reduces the space required in the laboratory compared with the traditional direct shear tester because it does not require a separate horizontal shear force loading system.

[0066] This invention reduces systematic errors in testing by welding a portion of the fixed mold to the base plate, thereby increasing the strength and rigidity of the fixed mold.

[0067] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A rock double-sided shear test device for use with a press, characterized in that, Includes a normal pressurization system and a shearing system; The normal pressurization system includes: a base (1), a magnetic frame (4), a normal pressurization jack (5), a positioning column (7), and a positioning bead (14); the shearing system includes a lower fixed mold (3), an upper fixed mold (8), a shearing mold (10), a normal fixed pad (15), a fixed mold inner ring (16), and a shearing mold inner ring (17); The base (1) has a lower fixing mold (3) symmetrically fixed on each side of its surface, and an upper fixing mold (8) shaped like an upper arch bridge is fixed on the top of each lower fixing mold (3). The upper fixing mold (8) and the lower fixing mold (3) form an arched circle. An inner ring (16) of the fixing mold is provided inside the arched circle. Between the lower fixed molds (3) on both sides, the shearing mold (10) is suspended. The shearing mold (10) has a cylindrical hole with the same diameter as the arched circle. The cylindrical hole is coaxial with the arched circle, and the inner ring (17) of the shearing mold is provided in the cylindrical hole. The inner diameter of the shearing die inner ring (17) and the two sides of the fixed die inner ring (16) is the same as the diameter of the test block (18). The center of the test block (18) is placed in the shearing die inner ring (17). The two ends of the test block (18) are each fitted into the corresponding side of the fixed die inner ring (16), and the normal fixing pad (15) is embedded in the fixed die inner ring (16) on each side, so that the inner side of the normal fixing pad (15) fits against the end face of the test block (18); the outer center of the normal fixing pad (15) has a recess. On the outer sides of the lower fixing mold (3) on both sides, a magnetic frame (4) is provided; the magnetic frame (4) on one side is equipped with the positioning post (7), the inner end of the positioning post (7) is fixed with the positioning bead (14), and the positioning bead (14) rests against the recess of the normal fixing pad (15) on the same side; the magnetic frame (4) on the other side is equipped with the normal pressure jack (5), the output end of the normal pressure jack (5) is fixed with another positioning bead (14), and the other positioning bead (14) rests against the recess of the normal fixing pad (15) on the same side.

2. The rock double-sided shear test device for use with a press according to claim 1, characterized in that, The base (1) is a cuboid and is placed horizontally at the center of the press.

3. The rock double-sided shear test device for use with a press according to claim 1, characterized in that, Two base handles (2) are provided on each side of the base (1); each base handle (2) is threadedly connected to the base (1).

4. The rock double-sided shear test device for use with a press according to claim 1, characterized in that, The normal pressure jack (5) has a hand pump interface (6) on one side.

5. A rock double-sided shear test device for use with a press according to claim 1, characterized in that, The positioning post (7) is cylindrical and is threadedly connected to the magnetic frame (4).

6. A rock double-sided shear test device for use with a press according to claim 1, characterized in that, The upper fixed mold (8) and the lower fixed mold (3) are connected and fixed by hexagonal bolts (9).

7. A rock double-sided shear test device for use with a press according to claim 1, characterized in that, The shearing system also includes a displacement measuring device (11), a dial indicator (12), and a spherical base (13); The displacement measuring device (11) is disposed on the top of the shearing mold (10); the spherical seat (13) is disposed on the top surface of the displacement measuring device (11); and a dial gauge (12) is disposed on each side of the displacement measuring device (11).

8. A rock double-sided shear test device for use with a press according to claim 7, characterized in that, The magnetic base of the dial indicator (12) is magnetically connected to the magnetic frame (4).

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