Rock tensile testing specimen bonding apparatus and its operation method

Abstract

This invention discloses a rock tensile testing specimen bonding device and its operating method. The rock tensile testing specimen bonding device includes a base with a specimen groove for placing the specimen. Two clamping heads are positioned above the specimen groove, symmetrically distributed on both sides of the specimen. Each clamping head has an adhesive sleeve between it and the specimen. The top of each adhesive sleeve has an injection hole with a sealing plug. A distance adjustment component for adjusting the distance between the two clamping heads is also fixed on the base. This rock tensile testing specimen bonding device effectively solves the problem of coaxial and equal thickness of the adhesive between the specimen and the clamping heads, thereby improving the effectiveness and accuracy of direct tensile testing of bonded rocks. Furthermore, this rock tensile testing specimen bonding device can also bond specimens of different diameters and lengths.

Description

Technical Field

[0001] This invention relates to the field of mechanical testing equipment for rock materials, and in particular to a specimen bonding device and its operating method for rock tensile testing. Background Technology

[0002] For a long time, in the field of rock mechanics, research on the tensile mechanical properties of rocks has been significantly insufficient compared to research on the mechanical properties of rocks under compressive stress. One important reason for this is the inherent difficulty in conducting direct tensile tests on rocks. In direct tensile tests, the specimen is in a one-dimensional stress state, which can accurately reflect the actual stress state of the rock under tensile conditions. In particular, the rock-bonded direct tensile test, which uses high-strength adhesive to bond the upper and lower end faces of the rock specimen to the clamping heads of the mechanical loading test system, is the most effective test for measuring the tensile mechanical parameters of rocks. However, existing methods for bonding the specimen to the clamping heads are still not mature enough and have various defects and shortcomings: First, it is difficult to ensure that the thickness of the high-strength adhesive bonding between the upper and lower end faces of the specimen and the two clamping heads is exactly the same, directly affecting the reliability of the tensile test results; second, it is difficult to ensure coaxiality between the upper and lower end faces of the specimen and the two clamping heads, resulting in the tensile load and the specimen not being coaxial during the tensile test.

[0003] Patent No. ZL201310507021.8 discloses a sleeve-bonded direct tensile testing device and method for rocks. The testing device includes a matching sleeve assembly, a bonding device, and a tensile positioning device. The sleeve is bonded to the end face and part of the side face of the rock specimen. By increasing the bonding area at the specimen end, the tensile bearing capacity at the specimen end is effectively improved, thereby achieving the purpose of conducting high-strength rock tensile tests. (Patent No. ZL) Patent 201510054944.1 discloses a rock axial tensile testing device and method. The device includes a column, an upper positioning sleeve, a lower positioning sleeve, an upper pull head, a lower pull head, a specimen clamping sleeve, and a base plate. It also includes a clamping element with an inner and outer surface. The inner surface is cylindrical, and the outer surface is conical. The clamping sleeve has a conical surface matching the outer surface of the clamping element, and the clamping element is located within the conical surface of the clamping sleeve. This testing device ensures complete axial alignment of the specimen when bonded to the upper and lower pull heads, and effectively eliminates eccentricity during the tensile test. While both of these technical solutions address the problem of rock tensile testing to some extent, they do not address the issue of coaxiality and equal thickness of the adhesive between the specimen and the clamping pull head. Neglecting this issue directly affects the effectiveness and accuracy of direct tensile testing of bonded rocks. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to provide a sample bonding device and its operating method for rock tensile testing, which can effectively solve the problem of coaxial and equal thickness of the adhesive between the sample and the clamping head, thereby improving the effectiveness and accuracy of direct tensile testing of bonded rocks.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A specimen bonding device for rock tensile testing includes a base, characterized in that: the base is provided with a specimen groove for placing the specimen, and two clamping heads are provided above the specimen groove, the two clamping heads are symmetrically distributed on both sides of the specimen, and each clamping head is provided with an adhesive sleeve between itself and the specimen, the top of the adhesive sleeve is provided with an adhesive injection hole, and a sealing plug is provided at the adhesive injection hole; the base is also fixedly provided with a distance adjustment component for adjusting the distance between the two clamping heads.

[0007] Furthermore, the distance adjustment assembly includes two first support rods fixed to the base, with a sliding support column fixed to the top of each first support rod. A first sliding groove is formed at the center of each sliding support column, and two adjusting rods corresponding to the clamping pull head are slidably arranged in the first sliding groove. Both adjusting rods pass through the first sliding groove, and one end of each adjusting rod is detachably connected to the corresponding clamping pull head. The other end of the two adjusting rods is connected to a coarse and fine adjustment assembly, which is also mounted on the base.

[0008] Furthermore, the coarse and fine adjustment assembly includes a second sliding groove on the base, and two columns are slidably disposed in the second sliding groove. The two columns are respectively fixedly connected to the ends of the two adjustment rods.

[0009] One of the columns has a crossbar fixed to its top, and a first rack is installed at the bottom of the crossbar. The other column has a second rack fixedly connected to its inner side. The first rack and the second rack are both located between the two columns and are arranged in parallel. A coarse adjustment gear meshes between the first rack and the second rack. The center of the coarse adjustment gear has a rotating shaft. One end of the rotating shaft passes through the first sliding groove, and the other end of the rotating shaft is fixed with a coarse adjustment knob. Two limiting plates are fixed at the end of the rotating shaft that passes through the first sliding groove. The two limiting plates are located on both sides of the sliding support column.

[0010] Furthermore, a fine-tuning gear is fixedly sleeved at one end of the rotating shaft near the coarse-tuning knob. A worm gear is meshed at the bottom of the fine-tuning gear. The worm gear is mounted on the base via two second support rods, and the worm gear and the two second support rods are rotatably connected. A fine-tuning knob is provided at one end of the worm gear.

[0011] Furthermore, a first mounting block is fixed on the base, and a first mounting groove is formed on the first mounting block. A sample placement block is detachably installed in the first mounting groove. The sample placement block has the sample groove on its top, and a scale is provided on the top surface of the first mounting block near the sample groove.

[0012] Furthermore, at least one fixing clip is movably connected to the top of the sample placement block. The fixing clip is located above the sample groove, and the inner diameter of the fixing clip matches the diameter of the sample groove.

[0013] Furthermore, a second mounting block is fixedly provided on the base, and a second mounting groove is provided on the second mounting block. A first sample plate is fixedly provided in the second mounting groove. Two clamping plates are slidably connected to the first sample plate, and the two clamping plates are movably connected to the first sample plate. The sample groove is formed between the first sample plate and the two clamping plates.

[0014] Furthermore, an outer support plate is fixed on the base, a third sliding groove is provided on the top of the outer support plate, an inner support plate is slidably provided in the third sliding groove, the top of the inner support plate passes through the third sliding groove, and a second sample plate is fixed on the top of the inner support plate. The second sample plate is made of elastic material, and the sample groove is provided on the top of the second sample plate.

[0015] Two traction plates are symmetrically arranged on both sides of the outer support plate. Both traction plates are slidably connected to the base, and the tops of the two traction plates are fixedly connected to both ends of the second sample plate. A triangular block is installed on one side of each traction plate near the inner support plate. A first telescopic rod is installed on the top surface of the triangular block. The free end of the first telescopic rod is fixedly connected to the bottom surface of the second sample plate, and the included angle between the first telescopic rod and the inner support plate is 45 degrees.

[0016] Furthermore, a plurality of second telescopic rods are installed at the bottom of the third slide groove, and the tops of the plurality of second telescopic rods are fixedly connected to the bottom of the inner support plate; a plurality of third telescopic rods are installed on both sides of the outer support plate facing the two traction plates, and the free ends of the plurality of third telescopic rods are fixedly connected to the corresponding traction plates; two fourth slide grooves are opened on the base, and the bottoms of the two traction plates are slidably connected to the corresponding fourth slide grooves respectively.

[0017] Furthermore, the operating method of the specimen bonding device for rock tensile testing is characterized by including the following steps:

[0018] S1: Place both ends of the sample into the two adhesive sleeves respectively, and the length of the sample ends inside the two adhesive sleeves shall be the same.

[0019] S2: Place the sample and adhesive sleeve in the sample groove;

[0020] S3: Install the two clamping pull heads on the distance adjustment component, and adjust the distance between the two clamping pull heads by adjusting the distance adjustment component so that the opposite ends of the two clamping pull heads are respectively located in the two adhesive sleeves, and the length of the ends of the two clamping pull heads in the two adhesive sleeves is the same.

[0021] S4: Open the sealing plug on the glue injection hole and inject liquid glue into the glue sleeve through the glue injection hole until the liquid glue reaches the glue injection hole;

[0022] S5: Seal the injection hole with a sealing plug and let it stand for 24-48 hours until the liquid adhesive dries. Then, complete the bonding between the test and the clamping pull head.

[0023] The beneficial effects of this invention are: compared with the prior art, the improvement of this invention lies in that...

[0024] 1. The rock tensile test specimen bonding device of the present invention sets an adhesive sleeve between the specimen and the clamping head. By adjusting the length of the specimen and the clamping head inside the adhesive sleeve, the distance between the two ends of the specimen and the corresponding clamping head can be adjusted. When the distance between the two ends of the specimen and the corresponding clamping head is the same, liquid adhesive is injected into the bonding sleeve through the injection hole. This ensures that the liquid adhesive fills the space formed between the bonding sleeve, the specimen and the clamping head, thus ensuring that the adhesive between the specimen and the clamping head is coaxial and of equal thickness. This effectively solves the problem of coaxial and equal thickness of the adhesive between the specimen and the clamping head in the prior art, thereby improving the effectiveness and accuracy of direct tensile testing of rock bonding.

[0025] 2. The rock tensile test specimen bonding device of the present invention adopts a combination of coarse and fine adjustment when adjusting the distance between the two clamping heads. First, the distance between the two clamping heads is coarsely adjusted, and then the distance between the two clamping heads is further finely adjusted. Combined with the scale, the length of the end of the clamping head located in the adhesive sleeve during the movement can be precisely controlled, thereby improving the precise control of the bonding water thickness.

[0026] 3. The rock tensile test specimen bonding device of the present invention can bond specimens of different lengths and diameters. By adjusting the diameter of the specimen groove, the bonding operation of specimens of different diameters can be performed. When the specimen length changes, the bonding operation can be performed by adjusting the distance between the two clamping heads. The operation is simple and convenient, and it can bond standard rock specimens as well as non-standard rock specimens. Attached Figure Description

[0027] Figure 1 This is a front view of the sample bonding device structure in Embodiment 1 of the present invention.

[0028] Figure 2 This is a top view of the sample bonding device structure in Embodiment 1 of the present invention.

[0029] Figure 3 This is a schematic diagram of the distance adjustment component structure in Embodiment 1 of the present invention.

[0030] Figure 4 This is a schematic diagram of the sample placement block structure in Embodiment 1 of the present invention.

[0031] Figure 5 This is an exploded view of the connection structure between the sample and the clamping head in Embodiment 1 of the present invention.

[0032] Figure 6 This is a schematic diagram of the sample bonding device in the absence of a sample in Embodiment 1 of the present invention.

[0033] Figure 7 This is a schematic diagram of the sample bonding device in Embodiment 2 of the present invention.

[0034] Figure 8 This is a front view of the connection relationship between the second sample plate and the base in Embodiment 3 of the present invention.

[0035] Figure 9 This is a front view of the connection relationship between the second sample plate and the base after the diameter of the sample groove is changed in Embodiment 3 of the present invention.

[0036] Figure 10 This is a cross-sectional view showing the connection relationship between the outer support plate and the inner support plate in Embodiment 3 of the present invention.

[0037] Figure 11 This is a top view showing the connection relationship between the second sample plate and the tension plate in Embodiment 3 of the present invention.

[0038] The components are: 1-base, 2-sample, 3-sample slot, 4-clamping pull head, 5-adhesive sleeve, 501-injection hole, 502-sealing plug, 6-first support rod, 7-sliding support column, 8-first sliding groove, 9-adjusting rod, 901-locking nut, 902-connecting plate, 10-second sliding groove, 11-column, 12-crossbar, 13-first rack, 14-second rack, 15-coarse adjustment gear, 16-rotating shaft, 17-coarse adjustment knob, 18-limiting plate, 19-fine adjustment gear, 20-worm gear. 21-Second support rod, 22-Fine adjustment knob, 23-First mounting block, 2301-Scale, 24-First mounting groove, 25-Sample placement block, 26-Fixing clip, 27-Second mounting block, 28-Second mounting groove, 29-First sample plate, 30-Clamping plate, 31-Outer support plate, 32-Third slide groove, 33-Inner support plate, 34-Second sample plate, 35-Pull plate, 36-Triangular block, 37-First telescopic rod, 38-Second telescopic rod, 39-Third telescopic rod, 40-Fourth slide groove. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Example 1:

[0041] See attached document Figure 1-6 The illustrated rock tensile testing specimen bonding device includes a base 1, on which a specimen groove 3 for placing a specimen 2 is provided. Two clamping heads 4 are provided above the specimen groove 3, symmetrically distributed on both sides of the specimen 2. An adhesive sleeve 5 is provided between each clamping head 4 and the specimen 2. Both ends of the adhesive sleeve 5 are open, and the inner diameter of the adhesive sleeve 5 is slightly larger than the outer diameter of the specimen 2 and the clamping head 4, allowing the specimen 2 and the clamping head 4 to be inserted into the adhesive sleeve 5. The wall thickness of the adhesive sleeve 5 is very thin, and its effect on the height difference between the specimen 2 and the clamping head 4 is negligible. An adhesive injection hole 501 is provided at the top of the adhesive sleeve 5, and a sealing plug 502 is provided at the adhesive injection hole 501. A distance adjustment component for adjusting the distance between the two clamping heads 4 is also fixed on the base 1.

[0042] Specifically, a first mounting block 23 is fixedly mounted on the base 1. A first mounting groove 24 is formed on the first mounting block 23, and a sample placement block 25 is detachably mounted within the first mounting groove 24. The sample placement block 25 and the first mounting groove 24 are detachably connected through the correspondence of a boss and a groove. The sample groove 3 is formed on the top of the sample placement block 25, and a scale 2301 is provided on the top surface of the first mounting block 23 near the sample groove 3. Sample grooves 3 of different diameters can be formed on different sample placement blocks 25. By replacing sample placement blocks 25 with sample grooves 3 of different diameters, samples 2 of different diameters can be bonded. The cooperation of the boss and groove allows for quick replacement of the sample placement block 25. To ensure the installation stability between the sample placement block 25 and the first mounting block 23, magnets can be placed at corresponding positions on the sample placement block 25 and the first mounting block 23. The magnets' magnetism ensures that the two can be separated under external force, and that they can maintain stable adsorption without external force.

[0043] At least one fixing clip 26 is hinged to the top of the sample placement block 25. The fixing clip 26 is located above the sample groove 3, and its inner diameter matches the diameter of the sample groove 3. After the sample 2 is placed in the sample groove 3, the fixing clip 26 can be used to limit the position of the sample 2, which facilitates the subsequent adjustment and bonding of the clamping pull head 4. The scale 2301 is marked with 0 at the center and increases sequentially to both sides. When placing the sample 2, the center of the sample 2 can be aligned with 0 to facilitate the adjustment of the clamping pull head 4.

[0044] Furthermore, the distance adjustment assembly includes two first support rods 6 fixed on the base 1, and a sliding support column 7 fixed on the top of the two first support rods 6. A first sliding groove 8 is opened in the center of the sliding support column 7. Two adjusting rods 9 corresponding to the clamping pull head 4 are slidably arranged in the first sliding groove 8. Both adjusting rods 9 pass through the first sliding groove 8, and one end of each adjusting rod 9 is detachably connected to the corresponding clamping pull head 4. The other end of the two adjusting rods 9 is connected to a coarse and fine adjustment assembly, which is also installed on the base 1. Specifically, the end of the adjusting rod 9 is threaded with a locking nut 901, and the clamping pull head 4 has a connecting groove on one end face near the adjusting rod 9. The end of the adjusting rod 9 is locked and fixed to the connecting groove of the clamping pull head 4 by the locking nut 901. After the bonding operation is completed, the locking nut 901 is removed to release the limitation on the clamping pull head 4. At this time, a corresponding pull rod needs to be installed in the connecting groove at the end of the clamping pull head 4 to connect with the rock tensile testing machine for tensile testing.

[0045] Furthermore, the coarse and fine adjustment assembly includes a second sliding groove 10 provided on the base 1, and two columns 11 are slidably disposed in the second sliding groove 10. The two columns 11 are respectively fixedly connected to the ends of the two adjusting rods 9. Specifically, a connecting plate 902 is fixedly provided at one end of each adjusting rod 9 near the column 11. The adjusting rod 9 and the connecting plate 902 form an L-shaped structure, and the connecting plate 902 is fixedly connected to the corresponding column 11.

[0046] A crossbar 12 is fixedly mounted on the top of one of the columns 11, and a first rack 13 is installed on the bottom of the crossbar 12. A second rack 14 is fixedly connected to the inner side of the other column 11. The first rack 13 and the second rack 14 are both located between the two columns 11 and are arranged in parallel. A coarse adjustment gear 15 meshes between the first rack 13 and the second rack 14. A rotating shaft 16 is provided at the center of the coarse adjustment gear 15. One end of the rotating shaft 16 passes through the first sliding groove 8, and a coarse adjustment knob 17 is fixedly mounted on the other end of the rotating shaft 16. Two limiting plates 18 are fixedly mounted on the end of the rotating shaft 16 that passes through the first sliding groove 8. The two limiting plates 18 are respectively located on both sides of the sliding support column 7. When the coarse adjustment knob 17 is turned, the coarse adjustment knob 17 drives the rotating shaft 16 to rotate, thereby driving the coarse adjustment gear 15 on the rotating shaft 16 to rotate. When the coarse adjustment gear 15 rotates, it pushes the first rack 13 above the device and the second rack 14 below the device to move in opposite directions, thereby pushing the two columns 11 to move in opposite directions, further driving the two adjusting rods 9 and the corresponding clamping pull heads 4 to move in opposite directions, so as to realize the symmetrical adjustment of the distance between the clamping pull heads 4.

[0047] Furthermore, a fine-tuning gear 19 is fixedly sleeved at one end of the rotating shaft 16 near the coarse-adjustment knob 17. A worm gear 20 is meshed at the bottom of the fine-tuning gear 19. The fine-tuning gear 19 employs a turbine structure that cooperates with the worm gear 20. The worm gear 20 is mounted on the base 1 via two second support rods 21, and the worm gear 20 and the two second support rods 21 are rotatably connected. A fine-tuning knob 22 is provided at one end of the worm gear 20. Rotating the fine-tuning knob 22 drives the worm gear 20 to rotate, thereby driving the fine-tuning gear 19 to rotate. The fine-tuning gear 19 drives the rotating shaft 16 to rotate, ultimately causing the two adjusting rods 9 and the corresponding clamping pull head 4 to move in opposite directions. The cooperation between the worm gear 20 and the fine-tuning gear 19 allows for slight rotation of the fine-tuning gear 19, thus enabling fine-tuning of the two adjusting rods 9.

[0048] Furthermore, a method for operating a specimen bonding device for rock tensile testing includes the following steps:

[0049] S1: Place both ends of the sample 2 into the two adhesive sleeves 5 respectively, and the lengths of the ends of the sample 2 inside the two adhesive sleeves 5 shall be the same.

[0050] S2: Place the sample 2 and the adhesive sleeve 5 into the sample groove 3;

[0051] S3: Install the two clamping pull heads 4 on the ends of the two adjusting rods 9 respectively, and adjust the distance between the two clamping pull heads 4 by rotating the coarse adjustment knob 17 and the fine adjustment knob 22 so that the opposite ends of the two clamping pull heads 4 are respectively located in the two adhesive sleeves 5, and the length of the ends of the two clamping pull heads 4 in the two adhesive sleeves 5 is the same.

[0052] S4: Open the sealing plug 502 on the glue injection hole 501, and inject liquid glue into the adhesive sleeve 5 through the glue injection hole 501 until the liquid glue reaches the glue injection hole 501.

[0053] S5: Use sealing plug 502 to seal the glue injection hole 501, let it stand for 24-48 hours, and after the liquid glue dries, complete the bonding between test 2 and clamping pull head 4.

[0054] Example 2:

[0055] The only difference between Example 2 and Example 1 is the arrangement of the sample well 3; everything else is the same.

[0056] See attached document Figures 1-7 As shown, a second mounting block 27 is fixed on the base 1. A second mounting groove 28 is formed on the second mounting block 27. A first sample plate 29 is fixed in the second mounting groove 28. Two clamping plates 30 are slidably connected to the first sample plate 29. The two clamping plates 30 and the first sample plate 29 are hinged. The space formed between the first sample plate 29 and the two clamping plates 30 is the sample groove 3. When bonding samples 2 of different diameters, the distance between the two clamping plates 30 and the tilt angle between the two clamping plates 30 and the first sample plate 29 are adjusted according to the diameter of the sample 2 to be bonded. Then, a locking member is used to lock and fix the two clamping plates 30. The locking member in this application can be an existing locking member, which will not be described in detail in this application.

[0057] Example 3:

[0058] The only difference between Example 3 and Example 1 is the arrangement of the sample well 3; everything else is the same. Specifically,

[0059] See attached document Figures 1-6As shown in Figures 8-11, an outer support plate 31 is fixedly mounted on the base 1. A third sliding groove 32 is provided on the top of the outer support plate 31. An inner support plate 33 is slidably mounted in the third sliding groove 32. The top of the inner support plate 33 passes through the third sliding groove 32. A second sample plate 34 is fixedly mounted on the top of the inner support plate 33. The second sample plate 34 is made of elastic steel and can deform under external tensile force. The sample groove 3 is provided on the top of the second sample plate 34. It should be noted that the second sample plate 34 is made of elastic steel sheet material. The arc-shaped space formed after it bends under external force is the sample groove 3. The inner support plate 33 is located at the bottom center of the arc-shaped structure of the second sample plate 34.

[0060] Two tension plates 35 are symmetrically arranged on both sides of the outer support plate 31. Both tension plates 35 are slidably connected to the base 1, and the tops of the two tension plates 35 are fixedly connected to both ends of the second sample plate 34. A triangular block 36 is installed on one side of each tension plate 35 near the inner support plate 33. A first telescopic rod 37 is installed on the top surface of the triangular block 36. The free end of the first telescopic rod 37 is fixedly connected to the bottom surface of the second sample plate 34, and the included angle between the first telescopic rod 37 and the inner support plate 33 is 45 degrees.

[0061] The bottom of the third slide 32 is equipped with a plurality of second telescopic rods 38, and the tops of the plurality of second telescopic rods 38 are fixedly connected to the bottom of the inner support plate 33.

[0062] Multiple third telescopic rods 39 are installed on both sides of the outer support plate 31 facing the two tension plates 35, and the free ends of the multiple third telescopic rods 39 are fixedly connected to the corresponding tension plates 35; two fourth sliding grooves 40 are opened on the base 1, and the bottoms of the two tension plates 35 are slidably connected to the corresponding fourth sliding grooves 40 respectively.

[0063] When bonding samples 2 of different diameters, the diameter of the sample groove 3 needs to be adjusted. At this time, according to the required diameter of the sample groove 3, the second telescopic rod 38 is controlled to push and pull the inner support plate 33, thereby pushing and pulling the bottom center of the second sample plate 34. Simultaneously, the third telescopic rod 39 is controlled to push and pull the two pulling plates 35, causing the two side edges of the second sample plate 34 to move synchronously, thus changing the diameter of the second sample plate 34. At this time, the first telescopic rod 37 is simultaneously controlled to extend and retract, providing support at the position between the bottom and edge of the second sample plate 34, improving the stability of the second sample plate 34, and preventing slight deformation of the second sample plate 34 during the bonding process from affecting the bonding effect.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A specimen bonding device for rock tensile testing, comprising a base (1), characterized in that: The base (1) is provided with a sample groove (3) for placing the sample (2). The diameter of the sample groove (3) is adjustable. Two clamping pull heads (4) are provided above the sample groove (3). The two clamping pull heads (4) are symmetrically distributed on both sides of the sample (2). An adhesive sleeve (5) is provided between each clamping pull head (4) and the sample (2). An adhesive injection hole (501) is provided at the top of the adhesive sleeve (5). A sealing plug (502) is provided at the adhesive injection hole (501). The base (1) is also fixed with a distance adjustment component for adjusting the distance between the two clamping pull heads (4). The distance adjustment assembly includes two first support rods (6) fixed on the base (1), and a sliding support column (7) fixed on the top of the two first support rods (6). A first sliding groove (8) is opened in the center of the sliding support column (7). Two adjustment rods (9) corresponding to the clamping pull head (4) are slidably arranged in the first sliding groove (8). Both adjustment rods (9) pass through the first sliding groove (8), and one end of each adjustment rod (9) is detachably connected to the corresponding clamping pull head (4). The other end of the two adjustment rods (9) is connected to the coarse and fine adjustment assembly, which is also installed on the base (1). An outer support plate (31) is fixed on the base (1). A third sliding groove (32) is provided on the top of the outer support plate (31). An inner support plate (33) is slidably provided in the third sliding groove (32). The top of the inner support plate (33) passes through the third sliding groove (32). A second sample plate (34) is fixed on the top of the inner support plate (33). The second sample plate (34) is made of elastic material. The sample groove (3) is provided on the top of the second sample plate (34). Two tension plates (35) are symmetrically arranged on both sides of the outer support plate (31). Both tension plates (35) are slidably connected to the base (1), and the top of the two tension plates (35) is fixedly connected to both ends of the second sample plate (34). A triangular block (36) is installed on one side of each tension plate (35) near the inner support plate (33). A first telescopic rod (37) is installed on the top surface of the triangular block (36). The free end of the first telescopic rod (37) is fixedly connected to the bottom surface of the second sample plate (34), and the included angle between the first telescopic rod (37) and the inner support plate (33) is 45 degrees.

2. The rock tensile test specimen bonding device according to claim 1, characterized in that: The coarse and fine adjustment assembly includes a second sliding groove (10) opened on the base (1), and two columns (11) are slidably arranged in the second sliding groove (10). The two columns (11) are respectively fixedly connected to the ends of the two adjustment rods (9). A crossbar (12) is fixedly mounted on the top of one of the columns (11), and a first rack (13) is installed at the bottom of the crossbar (12). A second rack (14) is fixedly connected to the inner side of the other column (11). The first rack (13) and the second rack (14) are both located between the two columns (11) and are arranged in parallel. A coarse adjustment gear (15) meshes between the first rack (13) and the second rack (14). A rotating shaft (16) is provided at the center of the coarse adjustment gear (15). One end of the rotating shaft (16) passes through the first sliding groove (8), and a coarse adjustment knob (17) is fixedly mounted at the other end of the rotating shaft (16). Two limiting plates (18) are fixedly mounted at the end of the rotating shaft (16) that passes through the first sliding groove (8). The two limiting plates (18) are located on both sides of the sliding support column (7).

3. The rock tensile test specimen bonding device according to claim 2, characterized in that: A fine adjustment gear (19) is fixedly sleeved on one end of the rotating shaft (16) near the coarse adjustment knob (17). A worm gear (20) is meshed at the bottom of the fine adjustment gear (19). The worm gear (20) is mounted on the base (1) through two second support rods (21). The worm gear (20) and the two second support rods (21) are rotatably connected. A fine adjustment knob (22) is provided at one end of the worm gear (20).

4. The rock tensile test specimen bonding device according to claim 3, characterized in that: The base (1) is fixedly provided with a first mounting block (23), the first mounting block (23) is provided with a first mounting groove (24), a sample placement block (25) is detachably installed in the first mounting groove (24), the sample placement block (25) is provided with a sample groove (3) on its top, and a scale (2301) is provided on the top surface of the first mounting block (23) near the sample groove (3).

5. The rock tensile test specimen bonding device according to claim 4, characterized in that: At least one fixing clip (26) is movably connected to the top of the sample placement block (25). The fixing clip (26) is located above the sample groove (3), and the inner diameter of the fixing clip (26) matches the diameter of the sample groove (3).

6. The rock tensile test specimen bonding device according to claim 3, characterized in that: The base (1) is fixedly provided with a second mounting block (27), the second mounting block (27) is provided with a second mounting groove (28), the second mounting groove (28) is fixedly provided with a first sample plate (29), the first sample plate (29) is slidably connected with two clamping plates (30), the two clamping plates (30) and the first sample plate (29) are movably connected; the first sample plate (29) and the two clamping plates (30) form the sample groove (3).

7. The rock tensile test specimen bonding device according to claim 6, characterized in that: The bottom of the third slide (32) is equipped with a plurality of second telescopic rods (38), and the top of the plurality of second telescopic rods (38) is fixedly connected to the bottom of the inner support plate (33); The outer support plate (31) is equipped with multiple third telescopic rods (39) on both sides facing the two traction plates (35), and the free ends of the multiple third telescopic rods (39) are fixedly connected to the corresponding traction plates (35); the base (1) has two fourth sliding grooves (40), and the bottoms of the two traction plates (35) are slidably connected to the corresponding fourth sliding grooves (40).

8. The method of operating the rock tensile testing specimen bonding device as described in any one of claims 1-7, characterized in that, Includes the following steps, S1: Place both ends of the sample (2) into the two adhesive sleeves (5) respectively, and the length of the ends of the sample (2) inside the two adhesive sleeves (5) shall be the same. S2: Place the sample (2) and the adhesive sleeve (5) in the sample groove (3); S3: Install the two clamping pull heads (4) on the distance adjustment assembly, and adjust the distance between the two clamping pull heads (4) by adjusting the distance adjustment assembly so that the opposite ends of the two clamping pull heads (4) are respectively located in the two adhesive sleeves (5), and the length of the ends of the two clamping pull heads (4) in the two adhesive sleeves (5) is the same. S4: Open the sealing plug (502) on the glue injection hole (501), and inject liquid glue into the adhesive sleeve (5) through the glue injection hole (501) until the liquid glue reaches the glue injection hole (501); S5: Use the sealing plug (502) to seal the glue injection hole (501), let it stand for 24-48 hours, and after the liquid glue dries, complete the bonding between the sample (2) and the clamping pull head (4).

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