Rock tensile strength testing device and testing method

Abstract

The invention relates to a rock tensile strength testing device and method. The rock tensile strength testing device comprises a bottom plate and guide columns which are mounted on the bottom plate and are symmetrically arranged, and a top plate is arranged at the ends of the guide columns; the distance adjusting and controlling assemblies are arranged on the bottom plate and the top plate correspondingly and connected with the guide columns, and lifting plates which are symmetrically arranged are connected to the distance adjusting and controlling assemblies; the supporting mechanism is arranged on the lifting plate, an arc-shaped plate is connected to the supporting mechanism, a clamping and releasing mechanism is arranged on the supporting mechanism, and clamping plates which are symmetrically arranged are connected to the clamping and releasing mechanism; the gradual change pressure applying mechanism is arranged on the lifting plate and connected with the supporting mechanism, the gradual change pressure applying assembly can drive the arc-shaped plate and the clamping and releasing mechanism to move through the supporting mechanism so as to control the clamping plate to execute the clamping or releasing action, and the tensile strength of the rock can be measured in a bidirectional pressure applying mode.

Description

Technical Field

[0001] The invention relates to a rock tensile strength testing device and a testing method. Background Art

[0002] Tensile strength is an important parameter to measure the ability of rock to resist destruction. A comprehensive understanding of the evolution mechanism of rock tensile failure is of great significance for the theoretical research of rock mechanics.

[0003] The Brazilian splitting test usually refers to an experimental method used to test the tensile strength of materials such as rock, concrete, ceramics, etc. In this experiment, a circular sample is compressed until it splits along the diameter, so that the tensile strength of the material can be indirectly measured. This method is based on the principle of elastic mechanics, treating the specimen as an axisymmetric elastic body, and using the mechanical relationship during splitting failure to derive the tensile strength of the rock.

[0004] The existing Brazilian splitting test usually applies pressure to rock samples in a single direction to obtain the tensile strength of the rock. However, since the growth rate of the applied pressure is usually constant, if the growth rate is small, it will lead to slow experimental efficiency. If the growth rate is large, the tensile strength test results may be inaccurate. Summary of the invention

[0005] The purpose of the present invention is to provide a rock tensile strength testing device and a testing method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A rock tensile strength testing device, comprising: A bottom plate, and guide columns mounted on the bottom plate and symmetrically arranged, wherein the ends of the guide columns are provided with top plates; Also includes: A spacing control component is respectively arranged on the bottom plate and the top plate and connected to the guide column. A lifting plate which is symmetrically arranged is connected to the spacing control component. The spacing control component can drive the lifting plate to move along the length direction of the guide column. A support mechanism is arranged on the lifting plate, the support mechanism is connected to an arc plate, the support mechanism is provided with a clamping and releasing mechanism, and the clamping and releasing mechanism is connected to a symmetrically arranged clamping plate; A gradual pressure mechanism is arranged on the lifting plate and connected to the supporting mechanism. The gradual pressure assembly can drive the arc plate and the clamping and releasing mechanism to move through the supporting mechanism to control the clamping plate to perform a clamping or releasing action.

[0007] As a further solution of the present invention: the spacing adjustment component includes a guide sleeve slidably mounted on the guide column and symmetrically arranged, the guide sleeve is connected to the lifting plate, and cylinders are respectively installed on the bottom plate and the top plate, and the telescopic ends of the cylinders are connected to the lifting plate.

[0008] As a further solution of the present invention: the supporting mechanism includes a supporting rod installed on the lifting plate and symmetrically arranged, a connecting plate is slidably installed on the supporting rod, a symmetrically arranged arc rod is arranged on the connecting plate, and an elastic component connected to the connecting plate is arranged on the supporting rod.

[0009] As a further solution of the present invention: the elastic component includes a movable plate slidably mounted on the support rod, the movable plate is connected to the arc plate, a first spring is sleeved on the support rod, and two ends of the first spring are respectively abutted against the connecting plate and the movable plate.

[0010] As a further solution of the present invention: the clamping and releasing mechanism includes a sliding groove opened on the movable plate and symmetrically arranged, a fixing rod is arranged in the sliding groove, a sliding block slidingly connected to the sliding groove is slidably installed on the fixing rod, a receiving rod is arranged on the side wall of the sliding block, the receiving rod is connected to the clamping plate, and a limiting component is arranged on the sliding block.

[0011] As a further solution of the present invention: the limiting assembly includes a second spring mounted on the fixed rod and abutting against the sliding block, the side wall of the sliding block is provided with a support column, the end of the support column is provided with an inclined plate, and the inclined plate is in abutment with the arc rod.

[0012] As a further solution of the present invention: the gradual pressure mechanism includes a motor installed on the lifting plate, a transmission rod connected to the motor output shaft is rotatably installed on the lifting plate, and a guide assembly connected to the connecting plate is provided on the transmission rod.

[0013] As a further solution of the present invention: the guide assembly includes a guide groove opened on the transmission rod, a sliding sleeve is slidably installed on the transmission rod, the sliding sleeve is connected to the connecting plate, and the inner wall of the sliding sleeve is provided with a limit block slidably engaged with the guide groove.

[0014] A rock tensile strength testing method comprises the following steps: Step 1: Place the sample to be tested on the curved plate, and clamp and fix the sample through the clamping plate under the action of the clamping and releasing mechanism; Step 2: When the sample needs to be tested, the two lifting plates are controlled to move toward each other under the action of the spacing control component, so that the curved plates are controlled to move toward each other through the support mechanism; Step 3: At this time, the gradual pressure mechanism will control the samples to approach each other through the support mechanism and the arc plate. When both arc plates are in contact with the sample, under the action of the support mechanism, the clamping release mechanism controls the two clamping plates to move in a direction close to each other to release the sample; Step 4: Under the action of the gradual pressure mechanism, gradually apply pressure to the sample until the sample breaks.

[0015] Compared with the prior art, the beneficial effect of the present invention is that the present invention can apply bidirectional pressure to the rock sample disc to ensure that the tensile strength test has an efficient and fast effect. Specifically, the sample disc to be tested can be placed on the arc plate, and under the action of the clamping and releasing mechanism, the sample disc is fixed by the clamping plate to ensure that the sample disc will not deviate when the force is applied. At this time, the two lifting plates can be controlled by the spacing control component to move in the direction of approaching each other, so that the two arc plates are about to fit together, and the spacing control component no longer moves. At this time, the gradual pressure mechanism moves and drives the two arc plates to move in the direction of approaching each other through the supporting mechanism. When both arc plates are in contact with the sample disc, the arc plate no longer moves. Under the action of the gradual pressure mechanism, the clamping and releasing mechanism is controlled to move through the supporting mechanism, so that the clamping plate is separated from the sample disc. At the same time, under the action of the supporting mechanism, the pressure applied to the sample disc by the arc plate gradually increases, and under the action of the gradual pressure mechanism, it can also ensure that the pressure increase rate applied by the arc plate to the sample disc is reduced to increase the accuracy of the tensile strength test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a structural schematic diagram of an embodiment of a rock tensile strength testing device.

[0017] Figure 2 This is a structural schematic diagram from another angle in an embodiment of a rock tensile strength testing device.

[0018] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A in the middle.

[0019] Figure 4 This is a schematic diagram of the connection relationship between a portion of a clamping and releasing mechanism, a portion of a supporting mechanism, a portion of a spacing control component, and a portion of a gradual pressure mechanism in an embodiment of a rock tensile strength testing device.

[0020] Figure 5This is a structural schematic diagram of a partial clamping and releasing mechanism, a partial supporting mechanism, and a partial gradual pressure mechanism in an embodiment of a rock tensile strength testing device.

[0021] Figure 6 This is a schematic diagram of a partial half-section structure of an embodiment of a rock tensile strength testing device.

[0022] Figure 7 This is a schematic diagram of the explosion structure of part of the gradual pressure mechanism and part of the support mechanism in one embodiment of a rock tensile strength testing device.

[0023] Figure 8 This is a schematic diagram of the explosion structure of the clamping and releasing mechanism in one embodiment of the rock tensile strength testing device.

[0024] In the figure: 1, bottom plate; 2, guide column; 3, top plate; 4, guide sleeve; 5, lifting plate; 6, cylinder; 7, motor; 8, transmission rod; 801, guide groove; 9, sliding sleeve; 10, limit block; 11, support rod; 12, connecting plate; 13, first spring; 14, movable plate; 15, arc plate; 16, slide groove; 17, fixed rod; 18, sliding block; 19, second spring; 20, receiving rod; 21, clamping plate; 22, support column; 23, inclined plate; 24, arc rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0026] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0027] See also Figure 1 to Figure 8 In an embodiment of the present invention, a rock tensile strength testing device includes: A bottom plate 1, and guide columns 2 symmetrically mounted on the bottom plate 1, wherein a top plate 3 is disposed at the end of the guide column 2; Also includes: See also Figure 1 , Figure 2, Figure 4 , a spacing control component is respectively arranged on the bottom plate 1 and the top plate 3, and is connected to the guide column 2. A lifting plate 5 which is symmetrically arranged is connected to the spacing control component. The spacing control component can drive the lifting plate 5 to move along the length direction of the guide column 2. The spacing control component includes a guide sleeve 4 which is symmetrically arranged and is slidably mounted on the guide column 2. The guide sleeve 4 is connected to the lifting plate 5. Cylinders 6 are respectively installed on the bottom plate 1 and the top plate 3. The telescopic ends of the cylinders 6 are connected to the lifting plates 5.

[0028] In detail, tensile strength is an important parameter to measure the ability of rock to resist destruction. A comprehensive understanding of the evolution mechanism of rock tensile failure is of great significance to the theoretical research of rock mechanics. When testing tensile strength, the Brazilian splitting method is usually used. Disc-shaped samples can be selected and placed in the required position. In the initial state, the distance between the two lifting plates 5 is the smallest. After the sample is placed, under the action of the cylinder 6, the two lifting plates 5 are controlled to move to drive the guide sleeve 4 to move along the length direction of the guide column 2. The guide sleeve 4 and the guide column 2 have a guiding function to ensure that the lifting plate 5 will not deviate during movement. When the distance between the two lifting plates 5 reaches the required value, the cylinder 6 stops moving.

[0029] See also Figure 1 , Figure 2 , Figure 4-Figure 7 , a support mechanism is arranged on the lifting plate 5, and an arc-shaped plate 15 is connected to the support mechanism. The support mechanism includes a support rod 11 installed on the lifting plate 5 and symmetrically arranged, a connecting plate 12 is slidably installed on the support rod 11, and an arc-shaped rod 24 is symmetrically arranged on the connecting plate 12. An elastic component connected to the connecting plate 12 is provided on the support rod 11, wherein the elastic component includes a movable plate 14 slidably installed on the support rod 11, and the movable plate 14 is connected to the arc-shaped plate 15. A first spring 13 is sleeved on the support rod 11, and the two ends of the first spring 13 are respectively abutted against the connecting plate 12 and the movable plate 14.

[0030] It should be noted that the arc plate 15 is used to place the rock sample to be tested. When the rock is subjected to a tensile strength test, the rock sample disc can be placed on one of the arc plates 15 facing the bottom plate 1. In the initial state, under the action of the sample disc and the movable plate 14, the first spring 13 is subjected to a certain compression force, and the connecting plate 12 is located at the end of the stroke in the direction of the lifting plate 5. When the sample disc needs to be tested, the cylinder 6 works and drives the two lifting plates 5 to move in a direction close to each other to control the movement of the arc plate 15. When the two arc plates 15 are about to fit together, the cylinder 6 stops moving. At this time, the connecting plate 12 moves along the The connecting plate 12 moves along the length direction of the support rod 11 and moves in the direction away from the lifting plate 5. The connecting plate 12 will drive the movable plate 14 to move through the first spring 13 to drive the arc plate 15 to move. When the two arc plates 15 move to abut against the sample disc, the arc plate 15 stops moving, and the connecting plate 12 continues to move and compresses the first spring 13, so that the force of the arc plate 15 acting on the sample disc gradually increases to test the tensile strength of the sample. When the sample disc cracks, it means that the test is completed. At this time, the connecting plate 12 stops moving, and the loading force at the time of destruction can be recorded. The tensile strength of the sample disc is calculated according to the specimen size and the loading force.

[0031] Preferably, when the tensile strength is tested, the two arc plates 15 move in a direction approaching each other. Therefore, the tensile strength of the sample disc can be tested by applying force in both directions, thereby achieving the effect of efficient and rapid tensile strength testing. The Brazilian splitting method can be used to test sample discs of different strength grades and different mix ratios, and has high versatility.

[0032] See also Figure 1-Figure 6 , Figure 8 The support mechanism is provided with a clamping and releasing mechanism, and a symmetrically arranged card plate 21 is connected to the clamping and releasing mechanism. The clamping and releasing mechanism includes a slide groove 16 opened on the movable plate 14 and symmetrically arranged, and a fixed rod 17 is arranged in the slide groove 16. A sliding block 18 slidably mounted on the fixed rod 17 and slidably connected to the slide groove 16, and a receiving rod 20 is arranged on the side wall of the sliding block 18, and the receiving rod 20 is connected to the card plate 21, and a limiting assembly is arranged on the sliding block 18, wherein the limiting assembly includes a second spring 19 which is sleeved on the fixed rod 17 and abuts against the sliding block 18, and a support column 22 is arranged on the side wall of the sliding block 18, and an inclined plate 23 is arranged at the end of the support column 22, and the inclined plate 23 is in contact with the arc rod 24.

[0033] Furthermore, the inclined plate 23 is arranged in a triangular inclined shape, and the inclined surface is located on the side facing the arc rod 24. The clamping and releasing mechanism is arranged on one of the movable plates 14 facing the bottom plate 1. When the sample disc is tested, in order to ensure that the sample disc will not be displaced by the pressure of the arc plate 15, it is necessary to clamp the sample disc before testing. In the initial state, the second spring 19 is in a compressed state, so that the sliding block 18 is located at the end of the stroke of the slide groove 16 toward the arc plate 15, so that the two clamping plates 21 are in a mutually fitting state. When the sample disc needs to be tested, at this time, the two clamping plates 21 can be controlled to move in a direction away from each other, so that the sliding block 18 moves along the length direction of the fixed rod 17 and moves in a direction away from each other to compress the second spring 19.

[0034] At this time, the sample disc is placed on one of the arc plates 15 that cooperates with the card plate 21, and the force applied to the card plate 21 is removed, the second spring 19 is elastically released, and drives the two sliding blocks 18 to move in a direction approaching each other to control the movement of the card plate 21. When the card plate 21 abuts against the sample disc, the sample disc is fixed under the action of the card plate 21, and under the action of the card plate 21, it is ensured that the sample disc is located at the center position of the arc plate 15 to ensure that the sample disc is evenly stressed. When the sample disc needs to be tested, at this time, the two connecting plates 12 move along the length direction of the corresponding support rod 11 and move in a direction approaching each other, and the movable plate 14 is driven to move by the first spring 13, thereby driving the two arc plates 15 to move in a direction approaching each other. When both arc plates 15 abut against the sample disc, the arc plate 15 and the movable plate 14 no longer move.

[0035] At this time, the connecting plate 12 continues to move and compresses the first spring 13, and the distance between the connecting plate 12 and the movable plate 14 is reduced. The connecting plate 12 also drives the arc rod 24 to move. When the arc end of the arc rod 24 abuts against the inclined surface of the inclined plate 23, it drives the inclined plate 23 to move and drives the support column 22 to move, thereby driving the sliding block 18 to move in the direction away from the arc plate 15 to compress the second spring 19. The sliding block 18 also drives the two clamping plates 21 to move in the direction away from each other through the receiving rod 20, so that the clamping plate 21 is separated from the sample disc, ensuring that in the subsequent tensile strength test, the clamping plate 21 will not affect the detection result of the sample disc.

[0036] See also Figure 1 , Figure 2 , Figure 4-Figure 7, a gradual pressure-applying mechanism is arranged on the lifting plate 5 and connected to the supporting mechanism, the gradual pressure-applying assembly can drive the arc plate 15 and the clamping and releasing mechanism to move through the supporting mechanism to control the clamping plate 21 to perform a clamping or releasing action, the gradual pressure-applying mechanism includes a motor 7 installed on the lifting plate 5, a transmission rod 8 connected to the output shaft of the motor 7 is rotatably installed on the lifting plate 5, a guide assembly connected to the connecting plate 12 is arranged on the transmission rod 8, wherein the guide assembly includes a guide groove 801 opened on the transmission rod 8, a sliding sleeve 9 is slidably installed on the transmission rod 8, the sliding sleeve 9 is connected to the connecting plate 12, and a limit block 10 slidably engaged with the guide groove 801 is arranged on the inner wall of the sliding sleeve 9.

[0037] Furthermore, the guide groove 801 is arranged in a spiral shape, and starting from the direction toward the lifting plate 5, the pitch of the guide groove 801 gradually decreases. In the initial state, the limit block 10 is located at the end of the travel of the guide groove 801 toward the lifting plate 5, so that the sliding sleeve 9 is located at the end of the travel toward the lifting plate 5, so that the distance between the connecting plate 12 and the lifting plate 5 is minimized. When the sample disc needs to be tested, at this time, the motor 7 works and drives the transmission rod 8 to rotate, thereby driving the guide groove 801 to move. Under the action of the guide groove 801 and the limit block 10, the sliding sleeve 9 moves, and the sliding sleeve 9 also drives the connecting plate 12 to move along the length direction of the support rod 11. Since the connecting plate 12 and the support rod 11 have a guiding function, it is ensured that the sliding sleeve 9 moves along the length direction of the transmission rod 8 and will not rotate with the transmission rod 8. Since the pitch of the guide groove 801 is larger at this time, the movement rate of the sliding sleeve 9 is faster. Therefore, the two arc plates 15 will fit together quickly, and the sliding sleeve 9 continues to move, so that the elastic potential energy of the first spring 13 gradually increases, and the pressure of the two arc plates 15 on the sample disc gradually increases. In order to prevent the pressure exerted on the sample disc by the arc plates 15 from increasing too fast and causing inaccurate detection results, when the power of the motor 7 remains unchanged, the rotation speed of the transmission rod 8 remains unchanged. Under the action of the guide groove 801, the movement rate of the sliding sleeve 9 is gradually reduced, so that the growth rate of the pressure exerted by the arc plates 15 on the sample disc is gradually reduced, thereby ensuring the accuracy of the rock tensile strength test.

[0038] A rock tensile strength testing method comprises the following steps: Step 1: Place the sample to be tested on the arc plate 15, and clamp and fix the sample through the clamping plate 21 under the action of the clamping and releasing mechanism; Step 2: When the sample needs to be tested, the two lifting plates 5 are controlled to move toward each other under the action of the spacing control component, so as to control the arc plate 15 to move toward each other through the support mechanism; Step 3: At this time, the gradual pressure mechanism will control the samples to approach each other through the support mechanism and the arc plate 15. When both arc plates 15 are in contact with the samples, under the action of the support mechanism, the clamping release mechanism controls the two clamping plates 21 to move in a direction of approaching each other to release the samples. Step 4: Under the action of the gradual pressure mechanism, gradually apply pressure to the sample until the sample breaks.

[0039] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rock tensile strength testing device, comprising: A bottom plate (1), and guide columns (2) mounted on the bottom plate (1) and arranged symmetrically, wherein a top plate (3) is arranged at the end of the guide column (2); It is characterized by further comprising: a spacing control component, which is respectively arranged on the bottom plate (1) and the top plate (3) and is connected to the guide column (2); a lifting plate (5) which is symmetrically arranged is connected to the spacing control component, and the spacing control component is capable of driving the lifting plate (5) to move along the length direction of the guide column (2); A support mechanism is arranged on the lifting plate (5), the support mechanism is connected to an arc-shaped plate (15), the support mechanism is provided with a clamping and releasing mechanism, and the clamping and releasing mechanism is connected to a symmetrically arranged clamping plate (21); A gradual pressure mechanism is arranged on the lifting plate (5) and connected to the support mechanism, and the gradual pressure assembly can drive the arc plate (15) and the clamping and releasing mechanism to move through the support mechanism, so as to control the clamping plate (21) to perform a clamping or releasing action.

2. A rock tensile strength testing device according to claim 1, characterized in that: The spacing control assembly comprises a guide sleeve (4) slidably mounted on the guide column (2) and symmetrically arranged, the guide sleeve (4) being connected to the lifting plate (5), and cylinders (6) being respectively mounted on the bottom plate (1) and the top plate (3), and the telescopic ends of the cylinders (6) being connected to the lifting plate (5).

3. A rock tensile strength testing device according to claim 1, characterized in that: The support mechanism comprises a support rod (11) mounted on the lifting plate (5) and arranged symmetrically, a connecting plate (12) being slidably mounted on the support rod (11), a symmetrically arranged arc rod (24) being arranged on the connecting plate (12), and an elastic component connected to the connecting plate (12) being arranged on the support rod (11).

4. A rock tensile strength testing device according to claim 3, characterized in that: The elastic component comprises a movable plate (14) slidably mounted on the support rod (11), the movable plate (14) being connected to the arc-shaped plate (15), a first spring (13) being sleeved on the support rod (11), and two ends of the first spring (13) respectively abutting against the connecting plate (12) and the movable plate (14).

5. A rock tensile strength testing device according to claim 4, characterized in that: The clamping release mechanism comprises a slide groove (16) which is opened on the movable plate (14) and is symmetrically arranged. A fixing rod (17) is arranged in the slide groove (16). A sliding block (18) which is slidably mounted on the fixing rod (17) and is slidably connected to the slide groove (16). A receiving rod (20) is arranged on the side wall of the sliding block (18). The receiving rod (20) is connected to the clamping plate (21). A limit position component is arranged on the sliding block (18).

6. A rock tensile strength testing device according to claim 5, characterized in that: The limiting assembly comprises a second spring (19) sleeved on the fixed rod (17) and abutting against the sliding block (18); a support column (22) is provided on the side wall of the sliding block (18); an inclined plate (23) is provided at the end of the support column (22); the inclined plate (23) abuts against the arc rod (24).

7. A rock tensile strength testing device according to claim 3, characterized in that: The gradual pressure mechanism comprises a motor (7) mounted on the lifting plate (5), a transmission rod (8) connected to an output shaft of the motor (7) being rotatably mounted on the lifting plate (5), and a guide assembly connected to the connecting plate (12) being provided on the transmission rod (8).

8. A rock tensile strength testing device according to claim 7, characterized in that: The guide assembly comprises a guide groove (801) formed on the transmission rod (8); a sliding sleeve (9) is slidably mounted on the transmission rod (8); the sliding sleeve (9) is connected to the connecting plate (12); and a limit block (10) is provided on the inner wall of the sliding sleeve (9) and is slidably engaged with the guide groove (801).

9. A rock tensile strength testing method, using the rock tensile strength testing device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: placing a sample to be tested on the arc-shaped plate (15), and clamping and fixing the sample through the clamping plate (21) under the action of the clamping and releasing mechanism; Step 2: When the sample needs to be tested, the two lifting plates (5) are controlled to move towards a direction approaching each other under the action of the spacing control component, so as to control the curved plates (15) to move towards a direction approaching each other through the support mechanism; Step 3: At this time, the gradual pressure mechanism will control the samples to approach each other through the support mechanism and the arc plate (15). When both arc plates (15) are in contact with the samples, under the action of the support mechanism, the clamping release mechanism controls the two clamping plates (21) to move in a direction of approaching each other, so as to release the samples. Step 4: Under the action of the gradual pressure mechanism, gradually apply pressure to the sample until the sample breaks.

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