A shearing device

Abstract

The embodiment of the present application provides a shearing device, which comprises: a shearing box group, the shearing box group comprising an upper shearing box and a lower shearing box; a first fixing member sleeved on the upper shearing box; a second fixing member sleeved on the lower shearing box; two mounting plate groups respectively arranged on the first fixing member and the second fixing member, the mounting plate group being formed with a placing space for placing a sample, wherein a gap exists between the sample and the mounting plate group; and a sensor assembly connected to the mounting plate group and used for detecting a shearing test parameter of the sample, wherein the shearing test parameter comprises a relative position of a crack of the sample. By fixing the mounting plate group on the first fixing member and the second fixing member, the position of the sample is fixed, the action line of the shearing force on the sample is ensured to coincide with the centroid of the shearing box, and the test error is reduced. The sensor assembly is arranged on the mounting plate group, the position of the sensor on the mounting plate group is adjusted according to test requirements, the mounting efficiency of the sensor is improved, and the mounting difficulty is reduced.

Description

Technical Field

[0001] This application relates to the technical field of geotechnical engineering testing, and more specifically, to a shearing device. Background Technology

[0002] The shear properties of rock and soil are crucial for the stability evaluation of geotechnical engineering projects such as slope engineering and tunnel engineering. Currently, most studies use direct indoor shear tests to obtain the shear properties and related parameters of rock and soil, thus providing a basis for experimental research and subsequent numerical simulation work.

[0003] In the existing technology, the shear box used in the direct shear test is inconvenient for the installation and disassembly of the specimen, and there is no space reserved for the installation of sensors for detecting the shear parameters of the specimen, such as strain, acoustic emission and acceleration. The sensors need to be reinstalled on the specimen for each shear test, which is difficult and time-consuming. In addition, the placement of rock samples is not uniform, making it difficult for the line of action of the shear force to coincide with the centroid of the shear box, resulting in errors in the test results.

[0004] Therefore, it is necessary to propose a shearing device to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0007] Therefore, the present invention provides a shearing device.

[0008] In view of this, a shearing device is proposed according to an embodiment of this application, comprising:

[0009] A shear box assembly, comprising an upper shear box and a lower shear box;

[0010] The first fixing element is sleeved on the upper shear box;

[0011] The second fastener is fitted onto the lower shear box;

[0012] Two mounting plate assemblies are respectively disposed on the first fixing member and the second fixing member. The mounting plate assemblies form a placement space for placing the sample, wherein there is a gap between the sample and the mounting plate assemblies.

[0013] A sensor assembly, connected to the mounting plate assembly, is used to detect the shear test parameters of the specimen, wherein the shear test parameters include the relative position of the specimen crack.

[0014] In one feasible implementation, the mounting plate assembly includes:

[0015] Two plates are arranged in parallel within the first or second fixing member, and a placement space is formed between the two plates, wherein there is a gap between the sample and both plates;

[0016] The plate has multiple grid holes, and the sensor assembly is connected to the plate through the grid holes.

[0017] In one feasible implementation, the sensor assembly includes:

[0018] Acoustic emission sensor;

[0019] A sleeve is fitted onto the acoustic emission sensor, and the sleeve is provided with a latch, which is connected to the plate body through the mesh holes.

[0020] In one feasible implementation, the shearing device further includes:

[0021] The first pressure-bearing steel plate has a first through hole at the top of the first fixing member, and the first pressure-bearing steel plate passes through the first through hole and abuts against the upper shear box.

[0022] The first oil pump, abutting against the first pressure-bearing steel plate, is used to apply a normal load to the upper shear box.

[0023] In one feasible implementation, the shearing device further includes:

[0024] The second pressure-bearing steel plate has a second through hole on the side wall of both the first and second fixing members. The second pressure-bearing steel plate passes through the second through hole at the first fixing member and abuts against the upper shear box; the second pressure-bearing steel plate passes through the second through hole at the second fixing member and abuts against the lower shear box.

[0025] The second oil pump, which abuts against the second pressure-bearing steel plate, is used to apply tangential loads to the upper shear box and the lower shear box.

[0026] In one feasible implementation, the shearing device further includes:

[0027] The first rod body is connected to the end of the mounting plate assembly near the second fixing member at the first fixing member;

[0028] The second rod is connected to the end of the mounting plate assembly near the first fixing member at the second fixing member;

[0029] The sensor assembly also includes strain gauge sensors, which are respectively disposed at the first rod and the second rod, and are used to collect local instantaneous slip strain data of the sample contact seam.

[0030] In one feasible implementation, corner grooves are formed at the end faces of the first rod and the second rod, and the strain gauge sensor is disposed in the corner groove;

[0031] The angle of the corner groove is 40° to 50°.

[0032] In one feasible implementation, multiple first rods are provided, and the multiple first rods are arranged at intervals, with the gaps between adjacent first rods being equal.

[0033] The number of the second rod is the same as the number of the first rod, and the positions of the second rod correspond to the positions of the first rod.

[0034] In one feasible implementation, the mesh holes are square holes, and the length of the square holes is 1 cm to 3 cm; or

[0035] The mesh holes are circular, with a diameter of 1 cm to 3 cm.

[0036] In one feasible implementation, the first fastener, the second fastener, and the mounting plate assembly are all made of transparent material.

[0037] Compared to existing technologies, the present invention offers at least the following advantages: The shearing device provided in this application includes a shear box assembly, a first fixing member, a second fixing member, two mounting plate assemblies, and a sensor assembly. The shear box assembly comprises an upper shear box and a lower shear box. The first fixing member is fitted onto the upper shear box, and the second fixing member is fitted onto the lower shear box. Both the first and second fixing members are equipped with mounting plate assemblies for mounting the sensor assembly. The mounting plate assemblies form a placement space where a sample can be placed. A normal load is applied to the upper shear box, or a tangential load is applied to the upper and / or lower shear boxes to perform a shear test on the sample. The shear test parameters of the sample are detected by the sensor assembly. This configuration, by fixing the mounting plate assemblies to the first and second fixing members, ensures that the sample position is fixed, thereby aligning the line of action of the shear force on the sample with the centroid of the shear box, reducing test errors. Furthermore, by mounting the sensor assembly on the mounting plate assemblies, the position of the sensor on the mounting plate assemblies can be adjusted according to test requirements, eliminating the need to place the sensor on the sample, thus improving sensor installation efficiency and reducing installation difficulty.

[0038] The shearing device of the present invention, other advantages, objectives and features of the present invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0040] Figure 1 A schematic structural diagram of a shearing device provided in an embodiment of this application;

[0041] Figure 2 An assembly diagram of a first fastener and mounting plate assembly at one angle, provided for an embodiment of this application;

[0042] Figure 3 This is an assembly diagram of a first fastener and mounting plate assembly from another angle, provided as an embodiment of this application.

[0043] Figure 4 An assembly diagram of a second fastener and mounting plate assembly at one angle, provided for an embodiment of this application;

[0044] Figure 5 This is an assembly diagram of a second fastener and mounting plate assembly from another angle, provided as an embodiment of this application.

[0045] Figure 6 This is a schematic structural diagram of a sensor assembly provided in an embodiment of this application.

[0046] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0047] 110 Shear box assembly, 111 Upper shear box, 112 Lower shear box, 120 First fixing member, 121 First through hole, 122 Second through hole, 130 Second fixing member, 140 Mounting plate assembly, 141 Plate body, 142 Grid hole, 150 Sensor assembly, 151 Acoustic emission sensor, 152 Sleeve, 153 Button, 154 Strain gauge sensor, 160 First bearing steel plate, 161 Second bearing steel plate, 170 First oil pump, 171 Second oil pump, 180 First rod, 190 Second rod, 200 Sample. Detailed Implementation

[0048] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0049] like Figures 1 to 5 As shown in the embodiment of this application, a shearing device is proposed, comprising: a shearing box assembly 110, the shearing box assembly 110 including an upper shearing box 111 and a lower shearing box 112; a first fixing member 120 sleeved on the upper shearing box 111; a second fixing member 130 sleeved on the lower shearing box 112; two mounting plate assemblies 140 respectively disposed on the first fixing member 120 and the second fixing member 130, the mounting plate assemblies 140 forming a placement space for placing a sample 200, wherein there is a gap between the sample 200 and the mounting plate assemblies 140; and a sensor assembly 150 connected to the mounting plate assemblies 140 for detecting shear test parameters of the sample 200, wherein the shear test parameters include: the relative position of the crack in the sample 200.

[0050] It is understood that the shearing device provided in this embodiment includes a shear box assembly 110, a first fixing member 120, a second fixing member 130, two mounting plate assemblies 140, and a sensor assembly 150. The shear box assembly 110 includes an upper shear box 111 and a lower shear box 112. The first fixing member 120 is fitted onto the upper shear box 111, and the second fixing member 130 is fitted onto the lower shear box 112. Both the first fixing member 120 and the second fixing member 130 are provided with mounting plate assemblies 140. The mounting plate assemblies 140 are used to mount the sensor assembly 150, and the mounting plate assemblies 140 form a placement space in which a sample 200 can be placed. A normal load is applied to the upper shear box 111, or a tangential load is applied to the upper shear box 111 and / or the lower shear box 112, to perform a shear test on the sample 200. The shear test parameters of the sample 200 are detected by the sensor assembly 150. This configuration, by fixing the mounting plate assembly 140 to the first fixing member 120 and the second fixing member 130, ensures that the position of the sample 200 is fixed, thereby guaranteeing that the line of action of the shear force on the sample 200 coincides with the centroid of the shear box, reducing test errors. At the same time, by setting the sensor assembly 150 on the mounting plate assembly 140, the position of the sensor on the mounting plate assembly 140 can be adjusted according to the test requirements, eliminating the need to place the sensor on the sample 200, improving the sensor installation efficiency and reducing the installation difficulty.

[0051] It is understandable that after the sample 200 is placed in the placement space, there is a gap between the sample 200 and the mounting plate assembly 140 to ensure that the sample 200 and the mounting plate assembly 140 will not rub against each other, thus ensuring the accuracy of the test results.

[0052] Understandably, the first fixing member 120 is fitted to the upper shear box 111, ensuring that the force applied to the first fixing member 120 is effectively transmitted to the upper shear box 111, while reducing the deformation of the first fixing member 120 under stress. Similarly, the second fixing member 130 is fitted to the lower shear box 112. The mounting plate assembly 140 is positioned at the center of the first fixing member 120 and the second fixing member 130. Simultaneously, the shear box assembly 110 is placed at the center of the tangential and normal loading of the shearing instrument to ensure that the line of action of the shear force on the specimen 200 coincides with the centroid of the shear box, resulting in accurate test results.

[0053] In some examples, such as Figures 1 to 5 As shown, the mounting plate assembly 140 includes two plates 141, which are arranged in parallel within the first fixing member 120 or the second fixing member 130, and a placement space is formed between the two plates 141. There is a gap between the sample 200 and the two plates 141. The plates 141 are provided with a plurality of mesh holes 142, and the sensor assembly 150 is connected to the plates 141 through the mesh holes 142.

[0054] It is understood that the mounting plate assembly 140 has two plates 141, which are arranged parallel to each other at the center of the first fixing member 120 or the second fixing member 130, and a placement space is formed between the two plates 141 to place the sample 200. The distance between the two plates 141 can be adjusted according to the size of the sample 200. When the sample 200 is placed in the placement space, there is a gap between the sample 200 and the plates 141 on both sides to avoid friction between the sample 200 and the plates 141, ensuring the accuracy of the test. Multiple grid holes 142 are provided on the plates 141 so that the sensor assembly 150 can be connected to the plates 141 through the grid holes 142. For different samples 200 and test requirements, the position of the sensor assembly 150 relative to the sample 200 can be changed by aligning the sensor assembly 150 with different grid holes 142. Each grid hole 142 is the same size, so that the grid hole 142 can be used as a scale for the moving distance of the sensor assembly 150, making the movement of the sensor faster and more accurate, and improving the efficiency of the test.

[0055] In some examples, such as Figure 6As shown, the sensor assembly 150 includes: an acoustic emission sensor 151; a sleeve 152, which is fitted onto the acoustic emission sensor 151, and the sleeve 152 is provided with a button 153, which is connected to the plate 141 through the mesh hole 142.

[0056] Understandably, the sensor assembly 150 is equipped with an acoustic emission sensor 151, which detects the relative position of cracks generated in the sample 200 under shear force by emitting sound waves. A retainer 152 is fitted onto the acoustic emission sensor 151, and one end of the retainer 152 is provided with a latch 153. The latch 153 and the grid hole 142 are identical in shape, and the latch 153 and the grid hole 142 are interference-fitted to fix the acoustic emission sensor 151 at the grid hole 142, ensuring that the acoustic emission sensor 151 is in close contact with the sample 200, and preventing the acoustic emission sensor 151 from falling off during the test, thereby improving reliability.

[0057] Understandably, multiple acoustic emission sensors 151 can be arranged at the grid holes 142 simultaneously to form a detection matrix, so as to ensure the comprehensiveness of the detection data and improve the accuracy of the test results.

[0058] In some examples, such as Figures 1 to 3 As shown, the shearing device further includes: a first pressure-bearing steel plate 160, the top of the first fixing member 120 having a first through hole 121, the first pressure-bearing steel plate 160 passing through the first through hole 121 and abutting against the upper shearing box 111; and a first oil pump 170, abutting against the first pressure-bearing steel plate 160, for applying a normal load to the upper shearing box 111.

[0059] Understandably, the shearing device also includes a first pressure-bearing steel plate 160. Specifically, a first through hole 121 is provided at the top of the first fixing member 120. The first pressure-bearing steel plate 160 passes through the first through hole 121 and abuts against the upper shear box 111 to fix the position of the upper shear box 111 and prevent it from moving. At the same time, the shearing device applies a normal load to the upper shear box 111 through the first oil pump 170 to ensure that the upper shear box 111 is subjected to uniform and stable force.

[0060] It is understood that the first through hole 121 can be a rectangular hole, and the size of the rectangular hole can be adjusted according to the size of the pressure plate. For example, the size of the rectangular hole is 60mm long and 45mm wide. The size of the pressure plate is slightly smaller than the size of the rectangular hole so that it can pass through the rectangular hole.

[0061] In some examples, such as Figures 1 to 5As shown, the shearing device further includes: a second pressure-bearing steel plate 161, with second through holes 122 provided on the side walls of the first fixing member 120 and the second fixing member 130, the second pressure-bearing steel plate 161 passing through the second through holes 122 at the first fixing member 120 and abutting against the upper shear box 111; the second pressure-bearing steel plate 161 passing through the second through holes 122 at the second fixing member 130 and abutting against the lower shear box 112; and a second oil pump 171, abutting against the second pressure-bearing steel plate 161, for applying tangential loads to the upper shear box 111 and the lower shear box 112.

[0062] Understandably, the shearing device also includes a second pressure-bearing steel plate 161 and a second oil pump 171. Specifically, second through holes 122 are provided on the opposite sidewalls of the first fixing member 120 and the second fixing member 130. The second pressure-bearing steel plate 161 can pass through the second through hole 122 at the first fixing member 120 and abut against the upper shear box 111. The second pressure-bearing steel plate 161 can pass through the second through hole 122 at the second fixing member 130 and abut against the lower shear box 112. The shearing device abuts against the second pressure-bearing steel plate 161 through the second oil pump 171 to apply tangential loads to the upper shear box 111 and the lower shear box 112 respectively. This facilitates subsequent analysis of the local instantaneous slip strain of the contact joint of the sample 200, thereby simulating and analyzing the relevant laws of fault slip. Furthermore, it ensures uniform force in the tangential direction, thereby reducing experimental data errors and improving accuracy.

[0063] Understandably, when conducting shear tests to analyze the local slip patterns of faults, the specimen 200 can be divided into two parts, with the connection between the two parts being the upper shear box 111 and the lower shear box 112. By applying tangential loads in opposite directions to the upper shear box 111 and the lower shear box 112, fault slip can be simulated.

[0064] In some examples, such as Figures 1 to 5 As shown, the shearing device further includes: a first rod 180, connected to the first fixing member 120 at one end of the mounting plate assembly 140 near the second fixing member 130; a second rod 190, connected to the second fixing member 130 at one end of the mounting plate assembly 140 near the first fixing member 120; the sensor assembly 150 further includes a strain gauge sensor 154, which is respectively disposed at the first rod 180 and the second rod 190, for collecting local instantaneous slip strain data of the contact seam of the sample 200.

[0065] Understandably, the shearing device also includes a first rod 180 and a second rod 190. The first rod 180 is connected to the mounting plate assembly 140 at the first fixing member 120, near one end of the second fixing member 130. The second rod 190 is connected to the mounting plate assembly 140 at the second fixing member 130, near one end of the first fixing member 120. With this configuration, in the case of a shear test to analyze the local slip law of a fault, the first rod 180 abuts against the sample 200 in the upper shear box 111, and the second rod 190 abuts against the sample 200 in the lower shear box 112. The sensor assembly 150 also includes a strain gauge sensor 154, which is positioned on the first rod and the second rod 190 to detect the local instantaneous slip strain at the contact seam of the two sample parts 200 after being subjected to a tangential load, thereby simulating and analyzing the relevant laws of fault slip. The strain gauge sensor 154 is fixed by the first rod 180 and the second rod 190, ensuring that the strain gauge sensor 154 only detects the strain slip of the sample 200 in the shear direction, avoiding the influence of the normal load and ensuring the accuracy of the detection data.

[0066] In some examples, corner grooves are provided at the end faces of the first rod 180 and the second rod 190, and the strain gauge sensor 154 is disposed in the corner grooves; the angle of the corner grooves is 40° to 50°.

[0067] It is understandable that corner grooves are provided at the end faces of the first rod 180 and the second rod 190. The angle range of the corner grooves is 40° to 50°, with 45° being preferred. The corner grooves facilitate the adhesion of the strain gauge sensor 154, while ensuring the accuracy of the adhesion angle, providing accurate data for subsequent analysis, and avoiding data inaccuracies caused by damage to the sample 200 during the test.

[0068] In some examples, such as Figure 4 and Figure 5 As shown, there are multiple first rods 180, which are arranged at intervals and the gaps between adjacent first rods 180 are equal; the number of second rods 190 is the same as that of first rods 180, and the positions of the second rods 190 correspond to the positions of the first rods 180.

[0069] Understandably, this setup ensures that the strain gauge sensors 154 on the first rod 180 and the second rod 190 are positioned in a corresponding manner. By using multiple strain gauge sensors 154 to detect the local instantaneous slip strain at multiple locations of the contact joint after the two parts of the sample 200 are subjected to tangential load, a large amount of experimental data can be obtained to support the simulation analysis of the fault slip law, thus ensuring the accuracy of the results.

[0070] In some examples, the above-mentioned mesh hole 142 is a square hole with a length of 1 cm to 3 cm; or the above-mentioned mesh hole 142 is a circular hole with a diameter of 1 cm to 3 cm.

[0071] Understandably, the grid holes 142 can be either square or round depending on the actual needs. Similarly, the shape of the button 153 is consistent with the shape of the grid holes 142. The side length of the square holes is 1 cm to 3 cm, and the diameter of the round holes is 1 cm to 3 cm. Furthermore, the spacing of the grid holes 142 can be adjusted according to the experimental requirements.

[0072] In some examples, the first fastener 120, the second fastener 130, and the mounting plate assembly 140 are all made of transparent material.

[0073] It is understandable that the first fastener 120, the second fastener 130, and the mounting plate can all be made of transparent material to facilitate observation of the state of the specimen 200 during the shear test.

[0074] For example, acrylic material can be used, which has the advantages of high transparency, easy machining, and high structural strength. The thickness of the first fastener 120 and the second fastener 130 can be set from 0.5 cm to 2 cm according to the test load.

[0075] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0076] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shearing device, characterized in that, include: A shear box assembly, comprising an upper shear box and a lower shear box; The first fixing element is sleeved on the upper shear box; The second fastener is fitted onto the lower shear box; Two mounting plate assemblies are respectively disposed on the first fixing member and the second fixing member. The mounting plate assemblies form a placement space for placing a sample, wherein there is a gap between the sample and the mounting plate assemblies. Each mounting plate assembly includes two plate bodies, which are arranged parallel to each other within the first fixing member or the second fixing member. The placement space is formed between the two plate bodies, wherein there is a gap between the sample and both plate bodies. Each plate body has multiple mesh holes. A sensor assembly, connected to the mounting plate assembly, is used to detect the shear test parameters of the specimen, wherein the shear test parameters include the relative position of the specimen crack; the sensor assembly is connected to the plate body through the mesh holes.

2. The shearing device according to claim 1, characterized in that, The sensor assembly includes: Acoustic emission sensor; A sleeve is fitted onto the acoustic emission sensor, and the sleeve is provided with a latch, which is connected to the plate body through the mesh holes.

3. The shearing device according to claim 1, characterized in that, Also includes: The first pressure-bearing steel plate has a first through hole at the top of the first fixing member, and the first pressure-bearing steel plate passes through the first through hole and abuts against the upper shear box. The first oil pump, abutting against the first pressure-bearing steel plate, is used to apply a normal load to the upper shear box.

4. The shearing device according to claim 1, characterized in that, Also includes: The second pressure-bearing steel plate has a second through hole on the side wall of both the first and second fixing members. The second pressure-bearing steel plate passes through the second through hole at the first fixing member and abuts against the upper shear box; the second pressure-bearing steel plate passes through the second through hole at the second fixing member and abuts against the lower shear box. The second oil pump, which abuts against the second pressure-bearing steel plate, is used to apply tangential loads to the upper shear box and the lower shear box.

5. The shearing device according to claim 1, characterized in that, Also includes: The first rod body is connected to the end of the mounting plate assembly near the second fixing member at the first fixing member; The second rod is connected to the end of the mounting plate assembly near the first fixing member at the second fixing member; The sensor assembly also includes strain gauge sensors, which are respectively disposed at the first rod and the second rod, and are used to collect local instantaneous slip strain data of the sample contact seam.

6. The shearing device according to claim 5, characterized in that, Angle grooves are formed at the end faces of the first rod and the second rod, and the strain gauge sensor is disposed in the angle groove; The angle of the corner groove is 40° to 50°.

7. The shearing device according to claim 5, characterized in that, The first rod body is provided in multiple ways, and the multiple first rod bodies are arranged at intervals, and the gap between adjacent first rod bodies is equal; The number of the second rod is the same as the number of the first rod, and the positions of the second rod correspond to the positions of the first rod.

8. The shearing device according to claim 1, characterized in that, The mesh holes are square holes, and the length of the square holes is 1 cm to 3 cm; or The mesh holes are circular, with a diameter of 1 cm to 3 cm.

9. The shearing device according to claim 1, characterized in that, The first fastener, the second fastener, and the mounting plate assembly are all made of transparent material.

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