CN219201127U

CN219201127U - Clamp for biaxial compression test of sheet rock

Info

Publication number: CN219201127U
Application number: CN202223109906.6U
Authority: CN
Inventors: 雷瑞德; 陈玲; 胡超; 邹旭
Original assignee: Sichuan University of Science and Engineering
Current assignee: Sichuan University of Science and Engineering
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-06-16
Anticipated expiration: 2032-11-22

Abstract

The utility model discloses a clamp for a biaxial compression test of a thin plate rock, which comprises a rock compression test support frame, wherein a chute is formed in the rock compression test support frame, a pressure gauge is arranged on the rock compression test support frame, a transmission screw is arranged in the chute on the rock compression test support frame, a movable block is sleeved on the transmission screw, a support plate is arranged at the end part of the movable block, and a pressing block is arranged at the bottom of the support plate; according to the utility model, through threaded fit between the driving screw and the movable block, a vertical pressure effect is formed between the pressing block and the pressure gauge, meanwhile, the rotation of the screw is regulated, a horizontal pressure effect is formed between the clamping block and the rock compression test support frame, and the clamp can realize that the whole-field deformation evolution characteristics of rocks with different crack sizes can be detected under the condition that certain pressure effects are applied in the vertical and horizontal directions at the same time, so that the compression test of the thin plate rock is conveniently carried out.

Description

Clamp for biaxial compression test of sheet rock

Technical Field

The utility model relates to the technical field of rock compression test auxiliary devices, in particular to a clamp for a biaxial compression test of a thin plate rock.

Background

Geological disasters in engineering rock mass are mostly caused by the initiation, expansion and expansion of natural joints and cracks under the action of external load. The research on the crack damage stress threshold is not only helpful for understanding the crack process of the indoor rock, but also has important significance for evaluating the crack stress level of the rock in actual engineering.

The existing thin-plate rock is cuboid rock with the size of 50cm or 30cm or 3cm, the rock is planar when being tested, the rock is required to be clamped on a biaxial compression servo control experiment system to carry out compression resistance test, full-field strain evolution rules of the rock with different sizes under the action of pressure are conveniently detected, and the test system mainly comprises a biaxial loading unit, a DIC system and an AE system. The double-shaft loading unit comprises a horizontal brake and a vertical brake, vertical displacement and horizontal displacement are automatically measured by a displacement sensor, and the loading system mainly comprises two control modes of displacement and load.

However, due to the fact that the size of the rock is thin, the existing clamp can only control load from one direction of the vertical direction and the horizontal direction, so that the evolution characteristic of the full-field deformation of the rock with different crack sizes cannot be detected under the action of a certain pressure applied to the vertical direction and the horizontal direction at the same time, and therefore, the clamp for the biaxial compressive test of the thin-plate rock needs to be studied.

Disclosure of Invention

The utility model aims to provide a clamp for a biaxial compressive test of thin rock plates, which solves the problems in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a anchor clamps for sheet rock biax compressive test, includes rock compressive test support frame, the spout has been seted up on the rock compressive test support frame, is provided with the pressure gauge on the rock compressive test support frame, is located the spout on the rock compressive test support frame and is provided with drive screw, has cup jointed movable block on the drive screw, and the tip of movable block is provided with the backup pad, and the bottom of backup pad is provided with the briquetting, and the side of backup pad is provided with the extrusion subassembly of being convenient for adjust.

Preferably, the side surface of the pressure gauge is tightly attached to the side surface of the rock compression test support frame, and a servo motor is arranged on the top of the transmission screw on the rock compression test support frame.

Preferably, the movable block is connected with the transmission screw through internal and external threads, and two sides of the movable block are attached to the sliding groove.

Preferably, the support plate is of an L-shaped plate structure, and the bottom end height of the pressing block is lower than that of the support plate.

Preferably, the extrusion assembly comprises an adjusting screw, a threaded hole is formed in the side face of the supporting plate, and the threaded hole is connected with the adjusting screw through internal threads and external threads.

Preferably, the end part of the adjusting screw is rotationally connected with a supporting seat through a bearing, a groove is formed in the side surface of the supporting seat, a guide rod is arranged on the groove, and a clamping block is sleeved on the guide rod in a sliding manner.

Preferably, the clamping block is of an L-shaped structure, and the bottom end height of the clamping block is lower than that of the pressing block.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, through threaded fit between the driving screw and the movable block, a vertical pressure effect is formed between the pressing block and the pressure gauge, meanwhile, the rotation of the screw is regulated, a horizontal pressure effect is formed between the clamping block and the rock compression test support frame, and the clamp can realize the detection of the evolution characteristics of the full-field deformation of the rock with different crack sizes under the condition that certain pressure effects are applied in the vertical and horizontal directions at the same time, so that the compression test of the thin plate rock is facilitated.

2. According to the utility model, through sliding fit between the clamping blocks and the guide rods, under the action of a certain pressure applied in the horizontal direction, the pressure action change in the vertical direction between the pressing blocks and the pressure gauge can be formed, so that the evolution characteristics of the full-field deformation of rocks with different crack sizes can be detected, the effect of controlling the variables is achieved, and the practicability of the device is improved.

Drawings

Fig. 1 is a schematic structural view of a jig for a biaxial compressive test of thin rock according to the present utility model.

Fig. 2 is a cross-sectional view of the support plate of the present utility model.

Fig. 3 is an enlarged schematic view of the structure of fig. 2 a according to the present utility model.

FIG. 4 is a schematic view of the structure of the extrusion assembly of the present utility model.

In the figure: 1. a rock compression test support frame; 11. a pressure gauge; 2. a chute; 3. a drive screw; 4. a servo motor; 5. a movable block; 6. a support plate; 61. briquetting; 62. a threaded hole; 7. adjusting a screw; 71. a support base; 72. a groove; 73. a guide rod; 74. and clamping blocks.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 4, the present utility model provides a technical solution: the utility model provides a anchor clamps for sheet rock biax compressive test, includes rock compressive test support frame 1, has seted up spout 2 on the rock compressive test support frame 1, and fixed mounting has pressure gauge 11 on the rock compressive test support frame 1, and the model of pressure gauge 11 can be selected according to actual conditions, and the side of pressure gauge 11 is hugged closely on the side of rock compressive test support frame 1.

Be located on the rock compression test support frame 1 and rotate through the bearing and be connected with drive screw 3 in spout 2, be located on the rock compression test support frame 1 and install servo motor 4 at the top of drive screw 3, servo motor 4's model can be selected according to actual conditions, has cup jointed movable block 5 on the drive screw 3, inside and outside threaded connection between movable block 5 and the drive screw 3, laminating between the both sides of movable block 5 and the spout.

The tip welding of movable block 5 has backup pad 6, and backup pad 6 is "L" template form structure, and the bottom of backup pad 6 is fixed with briquetting 61, and the bottom height of briquetting 61 is less than the bottom height of backup pad 6, makes things convenient for briquetting 61 to exert certain pressure effect when moving downwards.

The side of backup pad 6 is provided with the extrusion subassembly of being convenient for adjust, and extrusion subassembly includes adjusting screw 7, and screw hole 62 has been seted up to the side of backup pad 6, and inside and outside threaded connection between screw hole 62 and the adjusting screw 7, adjusting screw 7's tip is connected with supporting seat 71 through the bearing rotation, makes supporting seat 71 be close to rock compression test support frame 1's side through screwing adjusting screw 7.

The side of supporting seat 71 has offered recess 72, and fixed grafting has guide bar 73 on the recess 72, has slided on the guide bar 73 and has cup jointed clamp splice 74, and clamp splice 74 is "L" type structure, and clamp splice 74 is the bottom height that has fixed weight, and the bottom height of clamp splice 74 is less than the bottom height of briquetting 61, and this high design makes clamp splice 74 can centre gripping to thinner sheet rock in the horizontal direction, all is equipped with pressure sensor on clamp splice 74 and the briquetting 61, does not show in the figure, for the common compression test device in this experiment.

During actual use, the thin plate rock is placed on the pressure gauge 11, the adjusting screw 7 is screwed, the supporting seat 71 is close to the side face of the rock compression test supporting frame 1, the clamping block 74 is used for extruding the side face of the thin plate rock, the clamping block 74 and the rock compression test supporting frame 1 form pressure action in the horizontal direction of the thin plate rock, certain horizontal direction pressure is applied to the thin plate rock, then the driving screw 3 is driven to rotate through the driving of the servo motor 4, the movable block 5 moves downwards along the axial direction of the driving screw 3, the pressing block 61 moves downwards to extrude the thin plate rock, the pressing block 61 and the pressure gauge 11 form pressure action in the vertical direction, different vertical direction pressure actions are applied to the thin plate rock, the whole-field deformation evolution characteristics of rocks with different crack sizes can be detected under the action of certain pressure applied in the vertical direction and the horizontal direction at the same time, the effect of controlling variables is achieved, and the compression test is conveniently carried out on the thin plate rock.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a anchor clamps for sheet rock biax compressive test, includes rock compressive test support frame (1), its characterized in that: the rock compression test support frame (1) is provided with a chute (2), the rock compression test support frame (1) is provided with a pressure gauge (11), the rock compression test support frame (1) is provided with a drive screw (3) in the chute (2), the drive screw (3) is sleeved with a movable block (5), the end part of the movable block (5) is provided with a support plate (6), the bottom of the support plate (6) is provided with a pressing block (61), and the side surface of the support plate (6) is provided with an extrusion assembly convenient to adjust.

2. A clamp for biaxial compressive testing of thin slab rock according to claim 1, wherein: the side of the pressure gauge (11) is tightly attached to the side of the rock compression test support frame (1), and a servo motor (4) is arranged on the top of the transmission screw (3) on the rock compression test support frame (1).

3. A clamp for biaxial compressive testing of thin slab rock according to claim 1, wherein: the movable block (5) is connected with the transmission screw (3) through internal and external threads, and two sides of the movable block (5) are attached to the sliding groove.

4. A clamp for biaxial compressive testing of thin slab rock according to claim 1, wherein: the support plate (6) is of an L-shaped plate-shaped structure, and the bottom end height of the pressing block (61) is lower than that of the support plate (6).

5. A clamp for biaxial compressive testing of thin slab rock according to claim 1, wherein: the extrusion assembly comprises an adjusting screw (7), a threaded hole (62) is formed in the side face of the supporting plate (6), and the threaded hole (62) is connected with the adjusting screw (7) through internal threads and external threads.

6. A clamp for biaxial compressive testing of thin slab rock according to claim 5, wherein: the end part of the adjusting screw (7) is rotatably connected with a supporting seat (71) through a bearing, a groove (72) is formed in the side surface of the supporting seat (71), a guide rod (73) is arranged on the groove (72), and a clamping block (74) is sleeved on the guide rod (73) in a sliding mode.

7. A clamp for biaxial compressive testing of thin slab rock according to claim 6, wherein: the clamping block (74) is of an L-shaped structure, and the bottom end height of the clamping block (74) is lower than that of the pressing block (61).