Drawing instrument capable of monitoring displacement of anchor rod in real time

Abstract

The utility model discloses a drawing instrument capable of monitoring the displacement amount of an anchor rod in real time, which comprises a counter-force gasket, a sleeve, a tension oil cylinder, a steel wire type spring displacement meter and a connecting rod, the counter-force gasket, the sleeve and the tension oil cylinder are sequentially arranged in a contact mode, one end of the connecting rod penetrates through the tension oil cylinder and the sleeve and then is in threaded connection with the exposed end of the anchor rod, and the other end of the connecting rod is in threaded connection with the steel wire type spring displacement meter. The other end penetrates through the tension oil cylinder and then is in threaded connection with a locking nut; the steel wire type spring displacement meter is arranged on the counter-force gasket and the tension oil cylinder and is fixed through elastic force of the steel wire type spring displacement meter. The drawing instrument provided by the utility model can measure and record the displacement of the anchor rod in real time in the drawing process of the anchor rod, simultaneously generates an anchor rod displacement-time whole-process curve, observes the displacement change trend of the anchor rod, and can export data in the later period, so that engineers can comprehensively evaluate the performance of the anchor rod.

Description

Technical Field

[0001] The utility model relates to the technical field of roadway bolt support quality detection, and particularly relates to a puller capable of real-time monitoring of bolt displacement. Background Technique

[0002] In roadway support, bolts are a common support material and are widely used to enhance the rock stability and bearing capacity around the roadway. The construction quality of bolts directly affects the safety and stability of the roadway. A puller is a commonly used tool in the field of bolt construction quality detection. In bolt pull-out tests, bolt displacement and anchoring force are important parameters and are the basis for engineers to evaluate the performance of bolts. In existing pullers, the anchoring force measured during bolt pulling can be easily read through a pressure gauge on an oil pump. And the pressure gauges on some pullers have been digitized and can store data at the same time. However, currently, there are still few measuring instruments and methods for bolt displacement during pulling. In the current patent, CN109115616B discloses a method of measuring the bolt displacement measured by a spring displacement gauge during the oil injection and loading process of a jack, using a static data acquisition instrument. However, the problem is that the layout position of the spring displacement gauge is unreasonable, the connection process is cumbersome, the full-process curve of bolt displacement - time cannot be generated, and the change trend of bolt displacement cannot be observed in real time; at the same time, this device has many parts and complex installation, which is not conducive to reducing staff and increasing efficiency. Content of the Utility Model

[0003] Aiming at the problem that the existing puller has difficulties in measuring the bolt displacement during the pulling process and cannot display the real-time trend of bolt displacement. The utility model aims to provide a puller capable of real-time monitoring of bolt displacement, so as to be able to measure and record the bolt displacement in real time during the bolt pulling process, generate the full-process curve of bolt displacement - time at the same time, and observe the change trend of bolt displacement. The data can be exported later for engineers to comprehensively evaluate the performance of bolts.

[0004] To achieve the above object, the utility model provides the following technical solution: A puller capable of real-time monitoring of bolt displacement, comprising a reaction pad, a sleeve, a tension oil cylinder, a steel string spring displacement gauge and a connecting rod. The reaction pad, the sleeve and the tension oil cylinder are sequentially arranged in contact with each other. One end of the connecting rod passes through the tension oil cylinder and the sleeve and is threadedly connected to the exposed end of the bolt, and the other end passes through the tension oil cylinder and is threadedly connected with a locking nut;

[0005] The steel string spring displacement gauge is arranged between the reaction pad and the tension oil cylinder and is fixed by its elastic force.

[0006] Preferably, the steel string spring displacement gauge has a left-right symmetric structure.

[0007] Preferably, the steel string type spring displacement gauge includes a protective sleeve and tie rods distributed at both ends of the protective sleeve. The protective sleeve is a tubular structure that is thick in the middle and thin on both sides. Two sets of exciting coils are symmetrically arranged in the middle of the protective sleeve, and both sets of exciting coils are electrically connected to a recorder through displacement data lines. One end of the tie rod facing the protective sleeve extends axially into the protective sleeve and is fixed with a limit ring. Inside the protective sleeve, a stress spring and a steel string that are connected to each other are also provided. One end of the stress spring facing away from the steel string is connected to the limit ring, and the steel string passes through the exciting coil and is connected to the middle of the protective sleeve.

[0008] Preferably, the recorder includes a display screen and a control panel, and a data line connector is also provided at the top thereof. The displacement data line is connected to the recorder through the data line connector.

[0009] Preferably, the tension oil cylinder includes a tension oil cylinder bottom, a tension oil cylinder top, and a tension oil cylinder piston located inside the cylinder body. The tension oil cylinder piston is in contact with the sleeve.

[0010] Preferably, a manual oil pump is further included, and the manual oil pump is communicated with the tension oil cylinder through a high-pressure oil pipe.

[0011] Compared with the prior art, the present utility model provides a puller that can monitor the displacement of the anchor bolt in real time, and has the following beneficial effects:

[0012] (1) The present utility model adopts the arrangement mode that the top of the tension oil cylinder is in contact with the sleeve and the bottom is in contact with the locking nut, solves the problems of difficult arrangement and cumbersome connection of the anchor bolt displacement gauge during pulling, reduces parts, and is beneficial to reducing the number of employees and increasing efficiency in the mine.

[0013] (2) The present utility model can generate a full-process curve of anchor bolt displacement - time during pulling for testers to observe the change trend of the anchor bolt displacement, and the data can be exported later for engineering personnel to comprehensively evaluate the performance of the anchor bolt.

[0014] (3) The present utility model can realize the full-process monitoring and real-time recording of the anchor bolt displacement during pulling.

[0015] (4) The steel string type spring displacement gauge adopted by the present utility model is designed with left-right symmetry, has a large measuring range, and is suitable for complex on-site testing conditions. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is a schematic diagram of the structure, installation and use of the puller of the present utility model;

[0018] Figure 2 is a schematic diagram of the recorder of the present utility model;

[0019] Figure 3 is a schematic diagram of the steel string spring displacement gauge in the present utility model, where, Figure 3A is the front view of the steel string spring displacement gauge, Figure 3B is the sectional view of the steel string spring displacement gauge;

[0020] Figure 4 is a schematic diagram of the installation and use of the steel string spring displacement gauge in the present utility model, Figure 4A is the installation schematic diagram of the steel string spring displacement gauge, Figure 4B is the sectional view after the installation of the steel string spring displacement gauge;

[0021] Figure 5 is the whole process curve of the bolt displacement - time in the present utility model.

[0022] In the figure: 1, rock mass; 2, anchoring agent; 3, bolt; 4, reaction gasket; 5, sleeve; 6, tension oil cylinder; 6-1, piston of the tension oil cylinder; 6-2, top of the tension oil cylinder; 6-3, bottom of the tension oil cylinder; 7, connecting rod; 8, locking nut; 9, high-pressure oil pipe; 10, pressure gauge; 11, manual handle; 12, manual oil pump; 13, pressure relief valve; 14, recorder; 14-1, display screen; 14-2, control panel; 14-3, data line connector; 15, displacement data line; 16, steel string spring displacement gauge; 16-1, protection sleeve; 16-2, pull rod; 16-3, limit ring; 16-4, stress spring; 16-5, steel string; 16-6, exciting coil. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0024] Please refer to Figure 1- Figure 4, this embodiment proposes a pulling instrument that can monitor the displacement of the anchor rod in real time, which specifically includes a reaction gasket 4, a sleeve 5, a tension cylinder 6, a steel string spring displacement meter 16 and a connecting rod 7. The reaction gasket 4, the sleeve 5 and the tension cylinder 6 are arranged in contact with each other in sequence. One end of the connecting rod 7 passes through the tension cylinder 6 and the sleeve 5 and is threadedly connected to the exposed end of the anchor rod, and the other end passes through the tension cylinder 6 and is threadedly connected to a locking nut 8. The steel string spring displacement meter 16 in this application is arranged on the reaction gasket 4 and the tension cylinder 6 and is fixed by its elastic force. The spring displacement meter connecting rod is eliminated to reduce equipment parts and facilitate installation.

[0025] As a preferred embodiment, the steel string spring displacement meter 16 in the present application has a bilaterally symmetrical structure, which doubles its measuring range and adapts to more complex testing conditions on site.

[0026] Specifically, the steel string spring displacement meter 16 includes a protective sleeve 16-1 and a pull rod 16-2 distributed at both ends of the protective sleeve 16-1, wherein the protective sleeve 16-1 is a cylindrical structure that is thick in the middle and thin on both sides. Two groups of excitation coils 16-6 are symmetrically arranged in the middle of the protective sleeve 16-1, and the two groups of excitation coils 16-6 are electrically connected to the recorder 14 through the displacement data line 15; the pull rod 16-2 extends axially toward one end of the protective sleeve 16-1 to the inside of the protective sleeve 16-1 and is fixed with a limit ring 16-3. The interior of the protective sleeve 16-1 is also provided with a force spring 16-4 and a steel string 16-5 connected to each other. The end of the force spring 16-4 facing away from the steel string 16-5 is connected to the limit ring 16-3, and the steel string 16-5 passes through the excitation coil 16-6 and is connected to the middle of the protective sleeve 16-1.

[0027] The recorder 14 in the present application includes a display screen 14-1 and a control panel 14-2. A data cable connector 14-3 is also provided on the top of the recorder 14. The displacement data cable 15 is connected to the recorder 14 through the data cable connector 14-3. The recorder 14 outputs an excitation signal through the displacement data cable 15, causing the excitation coil 16-6 to excite a periodic magnetic field. In the initial state, the force-bearing spring 16-4 inside the steel string spring displacement meter 16 is in a compressed state, and the steel string 16-5 is in a relaxed state. When the anchor rod is displaced, the force-bearing spring 16-4 inside the displacement meter relaxes, causing the steel string 16-5 to change from a relaxed state to a tensioned state. The change in the axial force state of the steel string 16-5 will cause a change in its vibration frequency under the magnetic field, that is, when the steel string 16-5 changes from a relaxed state to a tensioned state, the frequency increases. Furthermore, the steel strings 16-5 with different vibration frequencies vibrate in the magnetic field and perform cutting magnetic field motion, which will generate periodic currents of different frequencies in the excitation coil 16-6. The periodic current is transmitted to the recorder 14 via the displacement data line 15. The displacement of the anchor rod can be obtained according to the change in the current frequency, and a full-process curve of the anchor rod displacement-time can be generated.

[0028] The tension cylinder 6 includes a tension cylinder bottom 6-3, a tension cylinder top 6-2, and a tension cylinder piston 6-1 located within the cylinder body. The tension cylinder piston 6-1 contacts the sleeve 5. The tension cylinder 6 is driven to extend and retract by a manual oil pump 12, which is connected to the tension cylinder 6 through a high-pressure oil pipe 9.

[0029] This embodiment also discloses that the puller is used to perform a pull test on an anchor bolt in a coal mine roadway. The anchor bolt tested is a high-strength fully threaded steel anchor bolt (left-handed, Q500) with a specification of Ø18×2400mm.

[0030] The specific testing steps are as follows: Anchor bolt 3 is initially anchored in rock mass 1 using anchoring agent 2. First, remove the anchor bolt's tray and nut. Select a connecting rod 7 that matches the anchor bolt's diameter and connect it to anchor bolt 3. Then, insert reaction gasket 4 through anchor bolt 3 and position it against rock mass 1. Next, insert sleeve 5 through connecting rod 7 and position it against reaction gasket 4. Then, align the top 6-2 of tension cylinder 6 with sleeve 5. Install locknut 8 onto connecting rod 7, aligning the bottom 6-3 of tension cylinder with locknut 8. Tighten locknut 8. Connect tension cylinder 6 to manual oil pump 12 via high-pressure oil pipe 9. Connect tension cylinder 6 to manual oil pump 12 via tensioning pipe 9. Connect the tension rod 16-2 of steel wire spring displacement meter 16 to reaction gasket 4, with the other end resting against tension cylinder top 6-2, securing it using its elastic force. Connect steel wire spring displacement meter 16 to recorder 14 via displacement data cable 15.

[0031] After the assembly is completed, the recorder 14 is turned on. First, the displacement is reset to zero, and then the time is calibrated. The data acquisition frequency is determined to be once every 5 seconds. The range of the anchor displacement coordinate axis is adjusted to 0-50mm. The file name is written as 001, and the real-time trend interface is further entered. Close the pressure relief valve 13 on the manual oil pump 12, click the start button on the recorder 14, and press the manual pressure handle 11 to uniformly inject oil into the tension cylinder 6. During the loading process, the steel string spring displacement meter 16 measures the anchor displacement in real time and converts it into a periodic current of different frequencies. It is transmitted to the recorder 14 through the displacement data line 15, and the data is processed to generate the anchor displacement-time full process curve (such as Figure 5 ). Pay attention to the value on the pressure gauge 10. When the pull-out force reaches 141.7KN and no longer increases, stop loading. The measured pull-out force is 141.7KN. The pull-out test of the anchor rod 3 is now completed. Click the stop button on the recorder 14 and save the data.

[0032] After the bolt pull-out test is completed, the manual oil pump 12 is unloaded, the vibrating wire spring displacement gauge 16 is removed, and the connection between the displacement data cable 15 and the recorder 14 is disconnected; then the high-pressure oil pipe 9 is removed; and then the lock nut 8, the tension oil cylinder 6, the sleeve 5, the reaction pad 4, and the connecting rod 7 are removed in sequence. Finally, the data is exported for analysis.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pulling tester capable of real-time monitoring of the displacement of an anchor rod, characterized in that: It includes a reaction force gasket (4), a sleeve (5), a tension oil cylinder (6), a vibrating wire type spring displacement gauge (16) and a connecting rod (7). The reaction force gasket (4), the sleeve (5) and the tension oil cylinder (6) are arranged in contact with each other in sequence. One end of the connecting rod (7) penetrates through the tension oil cylinder (6) and the sleeve (5) and is threadedly connected to the exposed end of the anchor bolt, and the other end penetrates through the tension oil cylinder (6) and is threadedly connected with a locking nut (8). The vibrating wire type spring displacement gauge (16) is arranged between the reaction force gasket (4) and the tension oil cylinder (6) and is fixed by its elastic force.

2. The pull-out tester capable of real-time monitoring of the displacement of the anchor rod according to claim 1, characterized in that: The vibrating wire type spring displacement gauge (16) has a left-right symmetric structure.

3. The pull-out tester capable of real-time monitoring of the displacement of the anchor rod according to claim 2, characterized in that: The vibrating wire type spring displacement gauge (16) includes a protective sleeve (16-1) and tie rods (16-2) distributed at both ends of the protective sleeve (16-1). The protective sleeve (16-1) has a tubular structure that is thick in the middle and thin on both sides. Two groups of exciting coils (16-6) are symmetrically arranged in the middle of the protective sleeve (16-1). Both groups of exciting coils (16-6) are electrically connected to a recorder (14) through displacement data lines (15). One end of the tie rod (16-2) facing the protective sleeve (16-1) extends axially into the protective sleeve (16-1) and is fixed with a limiting ring (16-3). Inside the protective sleeve (16-1), a stress spring (16-4) and a steel wire (16-5) that are connected to each other are also arranged. One end of the stress spring (16-4) facing away from the steel wire (16-5) is connected to the limiting ring (16-3), and the steel wire (16-5) passes through the exciting coil (16-6) and is connected to the middle of the protective sleeve (16-1).

4. A pull-out tester capable of real-time monitoring of the displacement of the anchor rod according to claim 3, characterized in that: The recorder (14) includes a display screen (14-1) and a control panel (14-2), and a data line connector (14-3) is also arranged on its top. The displacement data line (15) is connected to the recorder (14) through the data line connector (14-3).

5. A pull-out tester capable of real-time monitoring of the displacement of an anchor bolt according to any one of claims 1-4, characterized in that: The tension oil cylinder (6) includes a tension oil cylinder bottom (6-3), a tension oil cylinder top (6-2) and a tension oil cylinder piston (6-1) located inside the cylinder body, and the tension oil cylinder piston (6-1) is in contact with the sleeve (5).

6. The pull-out tester capable of real-time monitoring of the displacement of the anchor rod according to claim 5, characterized in that: It also includes a manual oil pump (12), and the manual oil pump (12) is communicated with the tension oil cylinder (6) through a high-pressure oil pipe (9).

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