Nonmetal anchor rod shearing tool and shearing test method

Abstract

The invention belongs to the technical field of non-metal anchor rod shearing performance testing, and particularly discloses a non-metal anchor rod shearing tool and a shearing testing method.The non-metal anchor rod shearing tool comprises a support and a shearing tool, the shearing tool is used for installing a sample anchor rod in a front-back penetrating mode, and the top of the shearing tool is used for making contact with a testing machine; the support is used for mounting a shearing tool from top to bottom and is provided with a positioning hole through which a sample anchor rod passes; the shearing tool and the support are of a symmetrical structure after being assembled and are used for applying uniform shearing force to the two sides of the anchor rod. According to the shearing tool and the shearing test method for the non-metal anchor rod, the shearing tool is of a symmetrical structure, uniform stress on the two sides of the anchor rod can be achieved when a testing machine applies pressure, and therefore the accuracy of test data is improved, and repeated tests are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of non-metallic anchor rod shear performance testing, and in particular, to a non-metallic anchor rod shearing tool and a shearing testing method, which are mainly used for shearing performance testing of non-metallic anchor rods such as glass fiber reinforced plastic rods and basalt fiber reinforced plastic rods used in underground coal mines. Background Art

[0002] Non-metallic anchor rods such as glass fiber reinforced plastic rods and basalt fiber reinforced plastic rods are widely used in thick coal seam support and anchoring in coal mines. Shear strength is an important indicator that directly reflects the performance of non-metallic anchor rods and is one of the important assessment items in the product standard MT / T 1061-2008. The standard stipulates the test method and calculation formula for shear strength. The test method clearly requires the use of a special shear fixture, but does not give the specific structure and requirements of the special shear fixture. At present, the structure of the shear fixture used for testing varies greatly, and offsets often occur, resulting in uncut and slippage. It is not easy to obtain shear force, and multiple tests are required to obtain the shear force required by the standard. The efficiency is low, the work intensity is high, and the test data is relatively discrete and not comparable. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a non-metallic anchor rod shearing tool, a non-metallic anchor rod shearing tool and a shearing test method, which are symmetrical structures and can achieve uniform force on both sides of the anchor rod when the testing machine applies pressure, thereby improving the accuracy of the test data and reducing repeated tests.

[0004] The present invention adopts the following technical solution.

[0005] In a first aspect, the present invention provides a non-metallic anchor rod shearing tool, comprising: a support and a shearing tool. The shearing tool is used to install the sample anchor rod through the front and back, and the top of the shearing tool is used to contact the testing machine; the support is used to install the shearing tool from top to bottom, and the support is provided with a positioning hole for the sample anchor rod to pass through; the shearing tool and the support are assembled to form a symmetrical structure, which is used to apply uniform shearing force to both sides of the anchor rod.

[0006] Preferably, the support is a symmetrical structure, which includes: two support plates and two pads; the two support plates are symmetrically arranged with a gap between them; the two pads are arranged between the two support plates and symmetrically arranged on the left and right sides of the two support plates, and a mounting hole is formed between the two support plates and the two pads, and the mounting hole is used to install the shearing tool.

[0007] Preferably, the support plate is provided with positioning holes running through the front and back thereof, and the positioning holes are connected with the mounting holes, and the axes of the two positioning holes located on the two support plates coincide with each other; each positioning hole is detachably provided with a support ring on one side away from the mounting hole, and the axes of the two support rings coincide with each other, so as to support the anchor rod.

[0008] Preferably, the shearing tool is a symmetrical structure, which includes: a main body, a shearing platform, a shearing ring and a fixed clamping plate; the shearing ring is detachably arranged centrally at the bottom of the main body, and its inner diameter is adapted to the anchor rod; the fixed clamping plate is centrally arranged at the bottom of the shearing ring and is detachably connected to the main body; the shearing platform is centrally arranged at the top of the main body, and is used to contact the lower plate of the testing machine to transmit shear force to the specimen anchor rod.

[0009] Preferably, an arc groove matching the shear ring is provided at the bottom of the main body; an arc groove matching the surface of the shear ring is provided in the middle of the fixed clamping plate, and horizontal connecting surfaces are provided on the left and right sides of the arc groove, and the connecting surfaces are used to connect with the main body.

[0010] Preferably, the non-metallic anchor rod shearing tool further comprises: an automatic centering mechanism; the automatic centering mechanism is symmetrically arranged on the left and right sides of the support, and is used for elastically pressing the anchor rod on both sides of the anchor rod.

[0011] Preferably, the automatic centering mechanism includes: an electric cylinder, a rotating plate and an elastic telescopic mechanism; the electric cylinder is centrally arranged on the front and rear sides of the support, and the electric cylinder is arranged horizontally; the rotating plate is rotatably arranged at the output end of the electric cylinder, and the rotating plate is arranged vertically; the elastic telescopic mechanism is arranged on one side of each rotating plate close to the support, and the two elastic telescopic mechanisms of the two automatic centering mechanisms are respectively used to elastically compress the anchor rod on both sides of the anchor rod.

[0012] Preferably, the elastic telescopic mechanism includes: a telescopic rod, a spring and a compression sleeve; the axis of the telescopic rod coincides with the axis of the positioning hole, and one side of the telescopic rod is fixedly connected to the compression sleeve, and the other side is fixedly connected to the rotating plate; the spring sleeve is arranged on the outside of the telescopic rod, and one side of the spring is compressed by the compression sleeve, and the other side is compressed by the telescopic outer rod or the rotating plate, so as to apply equal compression force to both sides of the anchor rod.

[0013] Preferably, distance sensors are arranged at the same positions on both sides of the support, and a receiving head adapted to the distance sensor is arranged at the same position of each compression sleeve, and a controller connected to the distance sensor is arranged on the support.

[0014] On the other hand, the present invention provides a non-metallic anchor shear test method, using the aforementioned non-metallic anchor shear tool, comprising the following steps:

[0015] Step 1: Install the shearing tool on the support from top to bottom;

[0016] Step 2: Pass the sample anchor rod through the support and the shearing tool in sequence from front to back;

[0017] Step 3: Place the assembled support under the testing machine so that the lower plate of the testing machine contacts the top of the shearing tool;

[0018] Step 4, start the testing machine to start the shear test. The beneficial effect of the present invention is that, compared with the prior art, the present invention sets a symmetrical structure of the support and the shearing tool, so that the force on both sides of the sample anchor rod is uniform, which can fully meet the requirements of the shear strength test method in the MT / T1061-2008 standard, and realize the shear strength test of non-metallic anchor rods used in coal mines. At the same time, the sample anchor rod can be installed in the center of the shearing tool and subjected to shear force at the center, so that the anchor rod is not easy to deviate or slip, which can greatly improve the accuracy of the test data, reduce repeated tests, reduce work intensity, and shorten the inspection cycle, from the original set of shear performance tests of about 3 hours to about 15 minutes.

[0019] Furthermore, in order to ensure the centering of the anchor rod installation, the present invention also provides an automatic centering mechanism on the support. When installing the anchor rod, the automatic centering mechanism is first rotated and retracted. After the anchor rod is inserted into the support and the shearing tool, the automatic centering mechanism is rotated again, and the elastic clamping mechanism is used to apply equal clamping force to both sides of the anchor rod, thereby realizing automatic centering of the anchor rod.

[0020] In addition, distance sensors are provided at the front and rear of the support, and the distance between each support ring and the clamping sleeve is detected by the distance sensors. If the two distance sensors show the same reading, it indicates that the anchor rod is in the center position. If the two distance sensors show different readings, the corresponding electric cylinder is activated by the controller to readjust the position of the clamping sleeve so that the automatic centering mechanism can restore the symmetrical state to prevent the shearing tool from becoming eccentric after long-term use, which will affect the subsequent shearing test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a front view of the support in the present invention;

[0022] Figure 2 is a top view of the support structure in the present invention;

[0023] Figure 3 is a front view of the shearing tool in the present invention;

[0024] Figure 4 is a bottom view of the shearing tool in the present invention;

[0025] Figure 5 It is the assembly of the non-metallic anchor rod shearing tool in the present invention. Figure 1 ;

[0026] Figure 6 It is the assembly of the non-metallic anchor rod shearing tool in the present invention. Figure 2 ;

[0027] Figure 7 The non-metallic anchor shearing tool provided by the present invention is schematically shown after the sample anchor is installed. Figure 1 ;

[0028] Figure 8 The non-metallic anchor shearing tool provided by the present invention is schematically shown after the sample anchor is installed. Figure 2 .

[0029] Reference numerals in the figures:

[0030] 1. Support; 101. Support plate; 102. Backing plate; 103. First bolt; 104. Support ring; 105. Second bolt; 106. Groove; 107. Mounting hole;

[0031] 2. Shearing tool; 201. Fixed clamping plate; 202. Shearing ring; 203. Main body; 204. Shearing platform; 205. Third bolt; 206. Fourth bolt;

[0032] 3. Anchor rod;

[0033] 4. Automatic centering mechanism; 401. Electric cylinder; 402. Rotating plate; 403. Telescopic rod; 404. Spring; 405. Compression sleeve. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0035] like Figure 5 , Figure 6 As shown, embodiment 1 of the present invention provides a non-metallic anchor rod shearing tool, including: a support 1 and a shearing tool 2, both of which are made of alloy steel and are carbonitrided.

[0036] like Figure 1 , Figure 2As shown, the support 1 includes: two support plates 101, two pads 102 and two support rings 104. Among them, the two support plates 101 are symmetrically arranged with a gap between them, and the two pads 102 are arranged between the two support plates 101 and symmetrically arranged on the left and right sides of the two support plates 101, so that the two support plates 101 and the two pads 102 form a mounting hole 107, and the mounting hole 107 is used to install the shearing tool 2. The support 1 adopts a symmetrical structure, which can provide stable support force on both sides of the sample anchor rod, so that the anchor rod is more evenly stressed.

[0037] Furthermore, four first bolts 103 for fixing the support plates 101 and the pads 102 are provided on the two mounting plates 101. Each first bolt 103 passes through one support plate 101 and one pad 102, and is finally screwed into the inside of the other support plate 101. The four first bolts 103 are distributed in a rectangular array to achieve a fixed connection between the two support plates 101 and the two pads 102.

[0038] Furthermore, each support plate 101 is provided with a positioning hole running through the front and back thereof, and the positioning hole is connected to the mounting hole 107, and the axes of the two positioning holes coincide. A support ring 104 is detachably mounted on the side of each positioning hole away from the mounting hole 107, and each support ring 104 is detachably connected to the support plate 101 through two symmetrically arranged second bolts 105. The axes of the two support rings 104 coincide, and are used to support the sample anchor rod.

[0039] In a preferred but non-limiting embodiment of the present invention, the inner diameter of each support ring 104 is 2 mm larger than the outer diameter of the sample anchor rod. When in use, the anchor rod passes through the middle of the two support rings 104, which not only allows the sample anchor rod to be installed quickly and conveniently, but also allows the space for the anchor rod to move freely to be controlled, thereby ensuring the uniformity of the test results.

[0040] In a preferred but non-limiting embodiment of the present invention, the top of the pad 102 is flush with the top of the support plate 101, and the height of the pad 102 is smaller than that of the support plate 101, and the support 1 forms a first leg at the bottom of the left and right sides; a groove 106 is centrally provided at the bottom of each support plate 101, so that a second leg is formed at the bottom of the front and rear sides of the support plate 101, which not only reduces the weight of the device but also facilitates people to carry it.

[0041] like Figure 3 , Figure 4As shown, the shearing tool 2 includes: a main body 203, a shearing platform 204, a shearing ring 202 and a fixed clamping plate 201. An arc groove matching the shearing ring 202 is provided at the bottom of the main body 203, and the shearing ring 202 is detachably mounted at the bottom of the arc groove and fixedly connected to the main body 203 through the fixed clamping plate 201. The inner diameter of the shearing ring 202 is the same as the inner diameter of the support ring 104, and both are preferably 2 mm larger than the sample anchor rod.

[0042] The shearing tool 2 is also a symmetrical structure. When the shearing tool 2 is installed on the support 1, the bottom of the main body 203 is inside the mounting hole 107, and the shearing ring 202 is coaxial with the support ring 104. The sample anchor rod is simultaneously passed through the support ring 104 and the shearing ring 202, and centered. When the main body 203 applies shear force to the anchor rod, the two sides of the anchor rod are evenly stressed and are not easy to deviate or slip, which greatly improves the accuracy of the test data and reduces the number of tests.

[0043] In a preferred but non-limiting embodiment of the present invention, an arc groove adapted to the surface of the shear ring 202 is provided in the middle of the fixed clamp 201, and the arc groove is preferably a semicircular groove. Horizontal connecting surfaces are provided on the left and right sides of the semicircular groove, and the connecting surfaces are used to connect with the main body 203, so that the fixed clamp 201 is V-shaped as a whole.

[0044] Furthermore, bolt holes are provided on the connection surface, and the fourth bolts 206 are passed through the bolt holes of the fixed clamping plate 201 and screwed into the bottom of the main body 203 to achieve a detachable connection between the shear ring 202 and the main body 203. Preferably, four fourth bolts 206 are provided and evenly distributed on the two connection surfaces, so that the bottom of the fixed clamping plate 201 is evenly stressed and the connection is reliable.

[0045] Furthermore, the shearing platform 204 is detachably mounted on the top of the main body 203, and the shearing platform 204 is provided with a third bolt 205 for fixing the shearing platform 204 and the main body 203. There are four third bolts 205, and the four third bolts 205 are arranged in a rectangular array, and each third bolt 205 penetrates the shearing platform 204 from top to bottom and is screwed into the main body 203. The shearing platform 204 conforms to the ergonomic structure and is used to directly contact the lower plate of the testing machine to transmit the shear force to the specimen anchor rod.

[0046] like Figure 5-Figure 8As shown, the non-metallic anchor rod shearing tool provided in this embodiment, when in use, first place the shearing tool 2 from top to bottom inside the mounting hole 107 of the support 1, then pass the sample anchor rod through the support ring 104 on the support plate 101 and the shear ring 202 in the shearing tool 2 in sequence, and place the sample in the center to achieve the installation of the sample. Then place the tool with the installed sample on the lower plate of the pressure testing machine, the lower plate directly contacts the shearing platform 204 of the shearing tool 2, and perform a pressure test to obtain the double-sided shear force.

[0047] In a preferred but non-restrictive embodiment of the present invention, the support ring 104 and the shear ring 202 can be set with a variety of inner diameter sizes. Before the test, the support ring 104 and the shear ring 202 with a suitable inner diameter can be selected according to the size of the sample anchor rod 3, so as to realize the shear test of non-metallic anchor rods with different diameters. It is possible to test the shear performance of non-metallic anchor rods with a diameter range of 16mm to 50mm, covering all specifications of non-metallic anchor rods used in coal mines.

[0048] In a further preferred but non-limiting embodiment of the present invention, the non-metallic anchor rod shearing tool further includes: an automatic centering mechanism 4. The automatic centering mechanism 4 is symmetrically arranged on the left and right sides of the support 1, and the automatic centering mechanism includes: an electric cylinder 401, a rotating plate 402 and an elastic telescopic mechanism. The electric cylinder 401 is arranged on the front and rear sides of the support 1 (i.e., the two sides of the support 1 where the support ring 104 is arranged), and the electric cylinder 401 is arranged horizontally. The rotating plate 402 is rotatably arranged at the output end of the electric cylinder 401, and the rotating plate 402 is arranged vertically. The elastic telescopic mechanism is arranged on one side of each rotating plate 402 close to the support 1, and the elastic telescopic mechanism can be telescoped in the axial direction of the positioning hole, and the two elastic telescopic mechanisms of the two automatic centering mechanisms 4 are respectively used to elastically press the anchor rod 3 on both sides of the anchor rod 3, so that the anchor rod 3 can be automatically centered.

[0049] Before installing the anchor rod 3, the elastic clamping mechanism can be pulled outward and the rotating plate 402 can be rotated upward to avoid the installation path of the anchor rod 3. When the anchor rod 3 is roughly in the center position, the elastic clamping mechanism can be pulled outward again and the rotating plate 402 can be rotated back to the vertical direction. The elastic clamping mechanism is released to allow the anchor rod 3 to be automatically centered, thereby ensuring that the force on both sides of the anchor rod 3 is uniform during the shear test.

[0050] Furthermore, the elastic telescopic mechanism includes: a telescopic rod 403, a spring 404 and a compression sleeve 405. The axis of the telescopic rod 403 coincides with the axis of the positioning hole, and one side of the telescopic rod 403 is fixedly connected to the compression sleeve 405, and the other side is fixedly connected to the rotating plate 402. The spring 404 is sleeved on the outside of the telescopic rod 403, and one side of the spring 404 is compressed by the compression sleeve 405, and the other side is compressed by the telescopic outer rod or the rotating plate 402. Through the elastic force of the spring 404, the compression sleeve 405 is compressed to the two ends of the anchor rod 3, and equal compression force is applied to both sides of the anchor rod 3.

[0051] Furthermore, a rubber pad is provided inside the compression sleeve 405, and the size of the compression sleeve 405 can be adapted to the sample anchor rod.

[0052] In a further preferred but non-limiting embodiment of the present invention, a distance sensor is arranged at the same position on the front and rear sides of the support 1. Preferably, the distance sensor is arranged at the same position of each support ring 107, and a receiving head adapted to the distance sensor is arranged at the same position of each compression sleeve 405, and a controller connected to the distance sensor is arranged on the support 1.

[0053] When the distances between the support ring 107 and the clamping sleeve 405 detected by the two distance sensors are the same, it proves that the sample anchor rod 3 is now in the centered state. If the readings of the two distance sensors are different, the controller starts the electric cylinder 401 on the side with the smaller distance measurement value to extend until the readings of the two distance sensors are the same again.

[0054] By setting up the distance sensor and the electric telescopic rod, not only can the centering of the anchor rod be guaranteed, but also when the automatic centering mechanism is in an eccentric state, it can be automatically adjusted to a completely symmetrical state to prevent the shearing tool from being eccentric after long-term use, which will affect the subsequent shearing test.

[0055] Embodiment 2 of the present invention provides a non-metallic anchor shear test method, using the non-metallic anchor shear tool provided in embodiment 1, and the shear test method comprises the following steps:

[0056] Step 1, install the shearing tool 2 on the support 1 from top to bottom;

[0057] Step 2, passing the sample anchor rod 3 through the support 1 and the shearing tool 2 in sequence from front to back;

[0058] Step 3, placing the assembled support 1 under the testing machine, and making the lower plate of the testing machine contact with the top of the shearing tool 2;

[0059] Step 4: Start the testing machine to begin the shear test.

[0060] In a preferred but non-limiting embodiment of the present invention, step 1 comprises the following steps:

[0061] Step 1.1, according to the size of the sample anchor rod, select a suitable shear ring 202 and support ring 104;

[0062] Step 1.2, use the fixed clamping plate 201 to install the shear ring 202 on the bottom of the shearing tool 2, and use the fourth bolt 206 to achieve a fixed connection between the fixed clamping plate 201 and the main body 203;

[0063] Step 1.3, use the second bolt 105 to install the support ring 104 into the positioning holes of the two support plates 101;

[0064] Step 1.4: After the shearing tool 2 and the support 1 are completely assembled, the shearing tool 2 is installed on the support 1 from top to bottom.

[0065] In a preferred but non-limiting embodiment of the present invention, step 2 comprises the following steps:

[0066] Step 2.1, pull the elastic pressing mechanism outward and rotate the rotating plate 402 upward to avoid the installation path of the anchor rod 3;

[0067] Step 2.2, pass the sample anchor rod 3 through the support 1 and the shearing tool 2 in sequence, and when the anchor rod 3 is approximately in the middle position, pull the elastic clamping mechanism outward and rotate the rotating plate 402 back to the vertical direction;

[0068] Step 2.3, loosen the elastic clamping mechanism to allow the anchor rod 3 to be automatically centered.

[0069] Furthermore, a distance sensor is arranged at the same position of each support ring 107 , and a receiving head adapted to the distance sensor is arranged at the same position of each compression sleeve 405 .

[0070] If the readings of the two distance sensors are different, the controller starts the electric cylinder 401 on the side with the smaller distance measurement value to extend until the readings of the two distance sensors are the same again, thereby completing the automatic correction of the eccentricity of the automatic centering mechanism.

[0071] The beneficial effect of the present invention is that, compared with the prior art, the present invention provides a symmetrically structured support and shearing tool, so that the force on both sides of the sample anchor rod is uniform, and the requirements of the shear strength test method in the MT / T 1061-2008 standard are fully met, and the shear strength test of non-metallic anchor rods used in coal mines is realized. At the same time, the sample anchor rod can be centrally installed on the shearing tool and subjected to shear force at the center, so that the anchor rod is not easy to deviate or slip, which can greatly improve the accuracy of the test data, reduce repeated tests, reduce work intensity, and shorten the inspection cycle, from about 3 hours of the original set of shear performance tests to about 15 minutes.

[0072] Furthermore, in order to ensure the centering of the anchor rod installation, the present invention also provides an automatic centering mechanism on the support. When installing the anchor rod, the automatic centering mechanism is first rotated and retracted. After the anchor rod is inserted into the support and the shearing tool, the automatic centering mechanism is rotated again, and the elastic clamping mechanism is used to apply equal clamping force to both sides of the anchor rod, thereby realizing automatic centering of the anchor rod.

[0073] In addition, distance sensors are provided at the front and rear of the support, and the distance between each support ring and the clamping sleeve is detected by the distance sensors. If the two distance sensors show the same reading, it indicates that the anchor rod is in the center position. If the two distance sensors show different readings, the corresponding electric cylinder is activated by the controller to readjust the position of the clamping sleeve so that the automatic centering mechanism can restore the symmetrical state to prevent the shearing tool from becoming eccentric after long-term use, which will affect the subsequent shearing test.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. Non-metallic anchor shearing tool, including: The support (1) and the shearing tool (2) are characterized in that: the shearing tool (2) is used to install the sample anchor rod (3) through the front and back, and the top of the shearing tool (2) is used to contact the testing machine; The support (1) is used to install the shearing tool (2) from top to bottom, and the support (1) is provided with a positioning hole for the sample anchor rod (3) to pass through; The shearing tool (2) and the support (1) form a symmetrical structure after being assembled, and are used to apply uniform shearing force to both sides of the anchor rod (3).

2. The non-metallic anchor rod shearing tool according to claim 1 is characterized in that: The support (1) is a symmetrical structure, comprising: two support plates (101) and two pads (102); The two support plates (101) are symmetrically arranged with a gap between them; The two pads (102) are both arranged between the two support plates (101) and are symmetrically arranged on the left and right sides of the two support plates (101). A mounting hole (107) is formed between the two support plates (101) and the two pads (102). The mounting hole (107) is used to install the shearing tool (2).

3. The non-metallic anchor rod shearing tool according to claim 2 is characterized in that: The support plate (101) is provided with positioning holes penetrating the front and rear thereof, and the positioning holes are connected to the mounting holes (107), and the axes of the two positioning holes located on the two support plates (101) coincide with each other; A support ring (104) is detachably provided on one side of each positioning hole away from the mounting hole (107); the axes of the two support rings (104) coincide with each other, and are used to support the anchor rod (3).

4. The non-metallic anchor shearing tool according to any one of claims 1 to 3, characterized in that: The shearing tool (2) is a symmetrical structure, comprising: a main body (203), a shearing platform (204), a shearing ring (202) and a fixed clamping plate (201); The shear ring (202) is detachably arranged at the center of the bottom of the main body (203), and its inner diameter is adapted to the anchor rod (3); the fixed clamping plate (201) is detachably arranged at the center of the bottom of the shear ring (202) and is detachably connected to the main body (203); the shear platform (204) is detachably arranged at the center of the top of the main body (203) and is used to contact the lower plate of the testing machine to transmit shear force to the sample anchor rod.

5. The non-metallic anchor rod shearing tool according to claim 4, characterized in that: The bottom of the main body (203) is provided with an arc-shaped groove adapted to the shear ring (202); The fixed clamping plate (201) is provided with an arc-shaped groove adapted to the surface of the shear ring (202) in the middle, and horizontal connection surfaces are provided on the left and right sides of the arc-shaped groove, and the connection surfaces are used to be connected to the main body (203).

6. The non-metallic anchor shearing tool according to any one of claims 1 to 3, characterized in that: The non-metallic anchor rod shearing tool further comprises: an automatic centering mechanism (4); the automatic centering mechanism (4) is symmetrically arranged on the left and right sides of the support (1) and is used to elastically press the anchor rod (3) on both sides of the anchor rod (3).

7. The non-metallic anchor rod shearing tool according to claim 6, characterized in that: The automatic centering mechanism comprises: an electric cylinder (401), a rotating plate (402) and an elastic telescopic mechanism; The electric cylinder (401) is centrally arranged on both sides of the support (1), and the electric cylinder (401) is arranged horizontally; the rotating plate (402) is rotatably arranged at the output end of the electric cylinder (401), and the rotating plate (402) is arranged vertically; the elastic telescopic mechanism is arranged on one side of each rotating plate (402) close to the support (1), and the two elastic telescopic mechanisms of the two automatic centering mechanisms (4) are respectively used to elastically compress the anchor rod (3) on both sides of the anchor rod (3).

8. The non-metallic anchor rod shearing tool according to claim 7, characterized in that: The elastic telescopic mechanism comprises: a telescopic rod (403), a spring (404) and a compression sleeve (405); The axis of the telescopic rod (403) coincides with the axis of the positioning hole, and one side of the telescopic rod (403) is fixedly connected to the compression sleeve (405), and the other side is fixedly connected to the rotating plate (402); the spring (404) is sleeved on the outside of the telescopic rod (403), and one side of the spring (404) is compressed by the compression sleeve (405), and the other side is compressed by the telescopic outer rod or the rotating plate (402), so as to apply equal compression force to both sides of the anchor rod (3).

9. The non-metallic anchor rod shearing tool according to claim 8, characterized in that: Distance sensors are arranged at the same position on both the front and rear sides of the support (1), and a receiving head adapted to the distance sensor is arranged at the same position of each compression sleeve (405), and a controller connected to the distance sensor is arranged on the support (1).

10. A non-metallic anchor shear test method, using the non-metallic anchor shear tool as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, installing the shearing tool (2) on the support (1) from top to bottom; Step 2, passing the sample anchor rod (3) through the support (1) and the shearing tool (2) in sequence from front to back; Step 3, placing the assembled support (1) under the testing machine, and making the lower plate of the testing machine contact the top of the shearing tool (2); Step 4: Start the testing machine to begin the shear test.

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