Novel anchoring force test piece manufacturing device

Abstract

The invention discloses an anchoring force test piece manufacturing device which comprises a rack platform, a guide rail, an electric coal drill stirring system and a gantry clamp positioning system. The electric coal drill stirring system is in sliding connection with a guide rail on a rack platform through four rolling bearings installed at the bottom, and directional linear reciprocating motion is achieved. The gantry clamp positioning system is composed of two positioning gantry clamps which are symmetrically arranged and used for clamping and fixing an anchoring agent steel pipe test piece, and it is ensured that the test piece and a main shaft of the electric coal drill are strictly coaxial through laser centering calibration. The device has the advantages that through reasonable combination of three technologies of accurate centering, directional stirring and stable clamping, the problems of low precision, poor efficiency, unstable quality and the like in the traditional manual test piece manufacturing process are solved. The device realizes high-precision, high-efficiency and high-reliability manufacturing of the anchoring force test piece, has remarkable engineering application value, is particularly suitable for preparing the anchoring force test piece in mine support engineering, and is high in positioning precision, safe to operate and high in yield.

Description

Technical Field

[0001] This invention relates to the fields of geotechnical engineering and mine support testing technology, specifically to an anchoring force test specimen fabrication device and a method for fabricating anchoring force test specimens. It is mainly applicable to testing in geotechnical engineering, mine support, and building structure reinforcement. Background Technology

[0002] Anchoring agents are chemical bonding materials used to fix anchor bolts, reinforcing bars, or other metal components to substrates such as concrete and rock. They achieve rapid hardening and high-strength anchoring through a chemical reaction. They are mainly used in technical fields such as mine support, tunnel engineering, and building structure reinforcement. Their anchoring force, or pull-out resistance, is a key indicator for evaluating the reliability of anchoring systems. To test this performance, anchoring force test specimens need to be fabricated, and the quality of the specimen fabrication directly affects the accuracy of the test results. Currently, there is no dedicated equipment for fabricating anchoring force test specimens on the market. Traditional specimen fabrication relies heavily on manual operation and experience-based adjustments, resulting in low efficiency, difficulty in guaranteeing anchor bolt positioning accuracy, unstable quality, and a yield rate of less than 70%. Therefore, it is necessary to develop a new anchoring force test specimen fabrication device to solve the above problems and improve testing quality and efficiency. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide an apparatus for fabricating anchoring force test specimens and a method for fabricating specimens.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: an anchoring force test specimen fabrication device, characterized in that it comprises: ----Rack platform, the rack platform includes a rack and a table mounted on the rack; parallel linear guide rails are mounted on the table of the rack platform, and limit baffles are provided at both ends of the guide rails; ----The gantry clamp positioning system includes positioning gantry clamp A and positioning gantry clamp B, which are symmetrically arranged on the frame platform for clamping simulated steel pipes. The central axis of the jaws of the two gantry clamps is parallel to the linear guide rail. The bottom of the gantry clamp is provided with a height positioning shim for adjusting the height. By adjusting the positioning shim, the axis of the anchor rod is made to coincide with the axis of the simulated steel pipe. The positioning gantry clamp A (2) and positioning gantry clamp B (3) are both fixedly connected to the frame platform by fastening screws. The coal drill mixing system includes a coal drill, a sliding base, rolling bearings, and a chuck mounted on the front shaft of the coal drill. The coal drill is fixedly mounted on the sliding base, and two sets of rolling bearings are symmetrically installed at the bottom of the sliding base. The rolling bearings cooperate with the linear guide rail to form a sliding pair. The coal drill moves axially along the linear guide rail on the sliding base.

[0005] Furthermore, the two pairs of symmetrically arranged rolling bearings on the sliding base are deep groove ball bearings. Each pair of bearings is fixed to both sides of the sliding base by bearing seats, and the outer ring of the bearing forms a rolling fit with the guide groove of the linear guide rail.

[0006] Furthermore, the frame is a gantry frame structure, including two sets of upper and lower parallel crossbeams and six supporting columns. The linear guide rail is fixed to the upper surface of the frame platform by bolts, and reinforcing ribs are provided between the crossbeams.

[0007] Furthermore, a scale is provided on the side of the guide rail to control the depth of the anchor rod entering the test steel pipe; the scale is 1500mm long and the zero point of the scale is aligned with the edge of the limiting baffle.

[0008] Furthermore, the linear guide is a high-carbon steel quenched guide with a surface hardness ≥ HRC58.

[0009] A method for preparing an anchoring force test specimen, using the apparatus described in any one of claims 1-5; the specimen preparation method includes the following steps: S1. Seal one end of the anchoring force test specimen steel pipe with an iron block, leaving the other end open; S2. Clamp the anchoring force test specimen steel pipe between positioning gantry clamp A and positioning gantry clamp B, with its open end facing the coal drill. S3. Install and fix the test anchor bolt onto the chuck of the coal drill; S4. Insert an anchoring agent into the steel pipe of the anchoring force test specimen; S5. Adjust the centering so that the axis of the test anchor rod coincides with the axis of the steel pipe of the anchoring force test specimen; S6. Start the coal drill and rotate it at a speed of not less than 300 r / min. While rotating and stirring along the guide rail, push it into the steel pipe of the anchoring force test specimen. During the pushing and stirring process, break the anchoring agent so that the putty and curing agent in the anchoring agent mix and react. S7. Stop the operation after the set time is reached, and remove the anchoring force test specimen after the anchoring agent has cured.

[0010] The beneficial effects of this invention are: by rationally combining three technologies—precise centering, directional mixing, and stable clamping—it solves the problems of low precision, poor efficiency, and unstable quality that exist in traditional manual specimen fabrication. It achieves high-precision, high-efficiency, and high-reliability manufacturing of anchoring force test specimens, possessing significant engineering application value, as detailed below: 1. High-precision positioning to ensure specimen coaxiality: The laser alignment instrument, combined with the double gantry clamp positioning system, ensures that the coaxiality error between the anchor rod and the steel pipe specimen is ≤0.1mm, which is far superior to traditional manual alignment (usually with an error ≥1mm). This avoids the problem of uneven distribution of anchoring agent leading to dispersion of anchoring force, and improves the consistency of specimen strength by more than 40%.

[0011] 2. Coal drill stirring and propulsion improves production efficiency: The coal drill with linear guide rail can rotate and stir while propulsing, reducing the production time of a single specimen from the traditional 30 minutes to 15-20 minutes, improving efficiency by 30%-50%.

[0012] 3. The structure is stable and reliable. The gantry frame base with high-precision guide rails ensures the rigidity of the equipment, and there is no deviation or vibration during the mixing process. The specimen molding qualification rate has been increased from the traditional 70% to 98%. Anti-slip clamping (clamping force ≥5kN) ensures the stability of the steel pipe specimens and prevents them from loosening or deflecting during mixing.

[0013] 4. Optimized safety performance and reduced operational risks: The enclosed guide rail design prevents mechanical damage caused by human intervention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Left side diagram In the diagram: 1. Frame platform; 2. Positioning gantry clamp A; 3. Positioning gantry clamp B; 4. Anchoring force test specimen steel pipe; 5. Test anchor rod; 6. Chuck; 7. Coal drill; 8. Sliding base; 9. Rolling bearing; 10. Guide rail; 11. Scale; 12. Height positioning shim; 13. Limiting baffle; 14. Frame crossbeam; 15. Fastening screw; 16. Frame column. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0016] An anchoring force test specimens typically consist of an anchoring force test steel pipe, an anchoring agent inserted into the anchoring force test steel pipe, and a threaded anchor rod.

[0017] like Figure 1-2 As shown in the figure, this embodiment provides a device for fabricating anchoring force test specimens, the specific implementation structure of which is as follows: Frame Platform 1: The frame platform consists of a frame and a table mounted on the frame. The overall frame platform has a gantry frame structure. The frame includes two sets of upper and lower parallel crossbeams and six frame columns, with reinforcing ribs between the crossbeams. The crossbeams and columns are made of Q235 angle steel, and the table is made of welded steel plate. The components are assembled using segmental welding, including: two sets of upper and lower parallel frame crossbeams 14, with cross-sectional dimensions of 50mm×50mm×5mm equal-sided angle steel, a length of 2100mm, and a width of 510mm. Six columns 16: cross-sectional dimensions of 50mm×50mm×5mm equal-sided angle steel, a height of 760mm. Platform panel: 10mm thick steel plate, with a surface flatness ≤0.1mm / m after grinding.

[0018] A linear guide rail system is installed on the platform 1, consisting of two parallel guide rails 10 mounted on the panel of the platform 1. The distance between the two guide rails is 300mm, the hardness of the guide rails is HRC58-62, and the surface roughness is Ra0.8μm. Rubber buffer limit baffles 13 are provided at both ends of the guide rails, absorbing impact energy ≥5J. The guide rails 10 are arranged parallel to each other on the platform 1, and their extensions do not intersect, ensuring that the coal drill can move linearly and without deviation. The guide rails 10 are made of high-carbon steel with a hardened surface hardness ≥HRC58.

[0019] A graduated scale, 1500 mm in length, is provided on the side of the guide rail 10. The zero point of the scale is aligned with the edge of the limiting baffle 13, used to control the depth of the anchor rod entering the anchoring force test steel pipe. The graduated scale provides operators with an intuitive and accurate visual reference, facilitating precise control of the distance between the end of the anchor rod and the front end of the anchoring agent filling after it enters the anchoring force test steel pipe. This ensures consistent anchoring lengths for specimens from the same batch and even different batches, providing a reliable basis for scientific experiments.

[0020] The gantry clamp positioning system consists of two identical positioning gantry clamps, A2 and B3. It includes: the clamp body is made of ZG270-500 cast steel, with a V-shaped jaw angle of 120°. The positioning gantry clamp is fixed to the frame platform 1 by fastening screws 15. The bottom is equipped with positioning shims 12 for height adjustment. The anchoring force test specimen steel pipe 4 is clamped and fixed by positioning gantry clamps A and B.

[0021] Coal drill mixing system: includes coal drill 7, sliding base 8, and two sets of rolling bearings 9 symmetrically installed on the bottom of sliding base 8. The rolling bearings 9 are deep groove ball bearings. Each pair of bearings is fixed on both sides of sliding base 8 through bearing seats. The outer ring of the bearing forms a rolling fit with the guide groove of guide rail 10.

[0022] The rolling bearing 9 and the guide rail 10 cooperate to form a sliding pair; the coal drill 7 is fixedly mounted on the upper end of the sliding base 8, and the coal drill 7 moves axially along the linear guide rail 10 with the sliding base 8. The experimental anchor rod 5 and the coal drill 7 are fixedly connected together by the chuck 6 installed on the front rotating shaft of the coal drill. The coal drill 7 can move back and forth in a straight line along the guide rail 10, which is convenient for positioning. During the molding of the specimen, it is pushed forward while being stirred.

[0023] A method for fabricating an anchoring force test specimen, using the aforementioned anchoring force test specimen fabrication device; additionally equipped with a laser alignment instrument, the specific fabrication method is as follows: 1. Cut a galvanized steel pipe with an outer diameter of 34mm and a length of 700mm as the anchoring force test specimen steel pipe 4. Roughen the inner surface of the pipe. Weld an iron block to seal one side of the steel pipe. Clamp the anchoring force test specimen steel pipe 4 between positioning gantry clamp A 2 and positioning gantry clamp B 3. 2. Cut a 20mm nominal diameter, 900mm long threaded steel anchor rod 5 without longitudinal ribs and fix it on the clamp 6; 3. Place the whole piece of resin anchoring agent, which is compatible with the test anchor rod, into the steel pipe 4 of the anchoring force test specimen; 4. Use a laser alignment instrument to adjust the alignment. First, clamp the S end of the laser alignment instrument detector onto the experimental anchor rod 5, and then clamp the M end of the detector onto the anchoring force test specimen steel pipe 4. Start the laser alignment instrument and adjust the positioning of the double gantry clamps so that the anchor rod 5 and the anchoring force test specimen steel pipe 4 are coaxial. After the alignment is completed, remove the detector. 5. Start the coal drill 7 and rotate it at a speed of not less than 300 r / min. While rotating and stirring along the guide rail 10, push it into the steel pipe of the test piece. During the pushing and stirring process, break the anchoring agent so that the putty and curing agent in the anchoring agent mix and react. 6. Stop operation after the standard specified time has been reached, and remove the test specimen after the anchoring agent has cured.

[0024] Testing revealed that the coaxiality error between the anchor bolt and the steel pipe specimen was ≤0.1mm, far superior to traditional manual alignment (typically with an error ≥1mm). The anchoring agent in the steel pipe specimen was uniformly distributed. The specimen strength consistency was improved by more than 40%.

[0025] The specimen molding pass rate was 98%.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the principles and rules of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for preparing anchoring force test specimens, characterized in that, include: ----Rack platform (1), the rack platform includes a rack and a table mounted on the rack; Parallel guide rails (10) are installed on the table surface of the frame platform (1), and limit baffles (13) are provided at both ends of the guide rails (10). The gantry clamp positioning system includes a positioning gantry clamp A (2) and a positioning gantry clamp B (3) symmetrically arranged on the frame platform (1) for clamping the anchoring force test specimen steel pipe (4). The center axis of the jaws of the two gantry clamps is parallel to the guide rail (10). The bottom of the gantry clamp is provided with a height positioning shim (12) for adjusting the height. The height positioning shim (12) makes the axis of the test anchor rod (5) coincide with the axis of the anchoring force test specimen steel pipe (4). The positioning gantry clamp A (2) and the positioning gantry clamp B (3) are fixedly connected to the frame platform (1) by fastening screws (15). The coal drill stirring system includes a coal drill (7), a sliding base (8), rolling bearings (9), and a chuck (6) mounted on the front shaft of the coal drill. The coal drill (7) is fixedly mounted on the sliding base (8). Two sets of rolling bearings (9) are symmetrically installed on the bottom of the sliding base (8). The rolling bearings (9) cooperate with the guide rail (10) to form a sliding pair. The coal drill (7) moves axially along the guide rail (10) on the sliding base (8).

2. The apparatus for preparing anchoring force test specimens according to claim 1, characterized in that: The two pairs of symmetrically arranged rolling bearings (9) on the sliding base (8) are deep groove ball bearings. Each pair of bearings is fixed on both sides of the sliding base (8) through bearing seats, and the outer ring of the bearing forms a rolling fit with the guide groove of the guide rail (10).

3. The apparatus for preparing anchoring force test specimens according to claim 1, characterized in that: The frame is a gantry frame structure, including two sets of upper and lower parallel crossbeams (14) and six frame columns (16). The guide rails (10) are fixed to the platform of the frame platform (1) by bolts, and reinforcing ribs are provided between the crossbeams.

4. The apparatus for preparing anchorage force test specimens according to claim 1, characterized in that: A scale is provided on the side of the guide rail (10) to control the depth of the anchor rod entering the steel pipe of the test piece; the scale is 1500mm long and the zero position of the scale is aligned with the edge of the limiting baffle (13).

5. The apparatus for preparing anchoring force test specimens according to claim 1, characterized in that: The guide rail (10) is a high-carbon steel quenched guide rail with a surface hardness ≥ HRC58.

6. A method for preparing an anchoring force test specimen, characterized in that, Using the apparatus according to any one of claims 1-5; the method for preparing the specimen includes the following steps: S1. Weld one end of the anchoring force test specimen steel pipe (4) with an iron block to seal it, and leave the other end open; S2. The anchoring force test specimen steel pipe (4) is clamped between positioning gantry clamp A (2) and positioning gantry clamp B (3), with its open end facing the coal drill (7). S3. Install and fix the test anchor rod (5) onto the chuck (6) of the coal drill; S4. Insert an anchoring agent into the steel pipe (4) of the anchoring force test specimen; S5. Adjust the centering so that the axis of the test anchor rod (5) coincides with the axis of the anchoring force test specimen steel pipe (4); S6. Start the coal drill (7) and rotate it at a speed of not less than 300 r / min. While rotating and stirring along the straight guide rail (10), push it into the anchoring force test steel pipe (4). During the pushing and stirring process, break the anchoring agent so that the putty and curing agent in the anchoring agent mix and react. S7. Stop the operation after the set time is reached, and remove the anchoring force test specimen after the anchoring agent has cured.

7. The method for preparing an anchoring force test specimen according to claim 6, characterized in that, Step 6 involves adjusting the centering so that the anchor rod (5) coincides with the axis of the anchoring force test specimen steel pipe (4), and then using a laser centering instrument to adjust the centering.

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