An anchor rod tensile force testing device

Abstract

An anchor rod tensile force testing device includes a tensiometer. The tensiometer includes a hydraulic cylinder and a hydraulic jack that are interconnected, and the hydraulic cylinder and the hydraulic jack are connected through a manual pump. The manual pump is rotatably connected with a swing rod. The device further includes a pushing mechanism for applying a thrust to the swing rod. The pushing mechanism includes a bottom plate, an upper limit ring, and a lower limit ring. The bottom plate is detachably connected to the hydraulic cylinder. At least one set of guiding rods is threadedly connected to the inner side of the upper limit ring. The number of guiding rods in one set is two. The guiding rods are threadedly connected to the lower limit ring and fixedly connected to the bottom plate. The swing rod passes through between the two guiding rods in the same group and is located between the upper limit ring and the lower limit ring. The present invention provides an anchor rod tensile force testing device that can apply a stable tensile force to the anchor rod and improve the accuracy of the test results.

Description

Technical Field

[0001] The invention relates to the technical field of anchor rod testing, in particular to an anchor rod tension testing device. Background Art

[0002] Anchor bolts are the most basic component of tunnel support in contemporary underground mining. They bind the surrounding rocks of the tunnel together so that the surrounding rocks can support themselves. Anchor bolts are now not only used in mines, but also in engineering technology to actively reinforce slopes, tunnels, and dams. Anchor bolt tension meter is a detection tool for measuring the anchoring force of anchor bolts. It plays an important role in anchor bolt support engineering and the research and engineering quality inspection of various anchor bolts.

[0003] In the prior art, the widely used anchor tension gauges all adopt the structural form and principle of "an anchor tension gauge" disclosed in Chinese patent CN201310174460.1. The anchor tension gauge is arranged in a mining tunnel. The anchor tension gauge includes a jack and an oil pump. The jack is provided with a base, and the base is provided with a nut. The base is fixed on the tunnel wall by the nut and corresponds to the anchor position in the tunnel. The anchor tension gauge is provided with a high-pressure oil pipe, and the jack and the oil pump are respectively provided with an oil pipe joint. The oil pipe joint of the oil pump is provided with a pressure gauge, and the oil pump is provided with a handle. The anchor tension gauge has good portability and is easy to use, but it also has shortcomings. Mainly, the adjustment process of the manual pump is realized by the tester controlling the handle. The slight shaking of the tester's hand will cause the change of the output tension of the jack, resulting in the continuous jumping of the reading of the pressure gauge. It can only be estimated according to the test requirements, resulting in a decrease in the accuracy of the test results. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides an anchor rod tension testing device, which can apply a stable tension to the anchor rod and improve the accuracy of the test result.

[0005] In order to achieve the above-mentioned purpose, the specific scheme adopted by the present invention is: an anchor tension testing device, including a tension gauge, the tension gauge includes a hydraulic cylinder and a hydraulic jack that are interconnected, and the hydraulic cylinder and the hydraulic jack are connected by a manual pump, and the manual pump is rotatably connected to a swing rod, the device also includes a pushing mechanism for applying thrust to the swing rod, the pushing mechanism includes a base plate, an upper limit ring and a lower limit ring, wherein the base plate is detachably connected to the hydraulic cylinder, and at least one group of guide rods is threadedly connected to the inner side of the upper limit ring, and the number of guide rods in a group is two, the guide rod is threadedly connected to the lower limit ring and fixedly connected to the base plate, and the swing rod passes between the two guide rods in the same group and is located between the upper limit ring and the lower limit ring.

[0006] As a further optimization of the above-mentioned anchor tension testing device: the bottom plate is fixedly connected to two side positioning plates and one end positioning plate, wherein the two side positioning plates are arranged opposite to each other, the hydraulic cylinder is located between the two side positioning plates, and one end of the hydraulic cylinder is against the end positioning plate, a screw is passed through the side positioning plate, one end of the screw is rotatably connected to a top plate, and the top plate is located between the two side positioning plates, and the other end of the screw is fixedly connected to a side positioning knob.

[0007] As a further optimization of the above-mentioned anchor tension testing device: a plurality of guide rods parallel to the screw rod are fixedly connected to the side of the top plate facing the side positioning plate, and the guide rods pass through the side positioning plate, and a soft gasket is fixedly connected to the side of the top plate facing away from the side positioning plate.

[0008] As a further optimization of the above-mentioned anchor tension testing device: a cavity is opened inside the top plate, and a circular linkage disk is rotatably arranged in the cavity. The linkage disk is coaxially fixed with a connecting rod, and the area of ​​the linkage disk is larger than the cross-sectional area of ​​the connecting rod. After the connecting rod extends out of the top plate, it is coaxially fixed with the screw rod.

[0009] As a further optimization of the above anchor tension testing device: the bottom plate is fixedly connected with two groups of the guide rods, and all the guide rods are evenly distributed along the circumferential direction of the upper limit ring.

[0010] As a further optimization of the above-mentioned anchor tension testing device: the bottom plate is fixedly connected with a stroke indicating mark rod, the stroke indicating mark rod is located on the inner side of the upper limit ring and the lower limit ring, and the stroke indicating mark rod is provided with a plurality of scale lines evenly distributed along the length direction.

[0011] As a further optimization of the above-mentioned anchor tension testing device: the outer side of the upper limit ring is rotatably connected with a plurality of rotating rods evenly distributed along the circumferential direction, and the end of the rotating rod away from the upper limit ring is fixedly connected with an iron bending rod. When the rotating rod is parallel to the axis of the upper limit ring, the iron bending rod faces the inner side of the upper limit ring, and the outer wall of the lower limit ring is provided with a plurality of notches evenly distributed along the circumferential direction, the width of the notches is equal to the diameter of the iron bending rod, and permanent magnets are embedded in the notches.

[0012] As a further optimization of the above anchor tension testing device: one end of the rotating rod close to the upper limit ring is rotatably connected to a mounting shaft, and both ends of the mounting shaft are respectively fixedly connected to a mounting plate, and the mounting plate is fixedly connected to the upper limit ring.

[0013] As a further optimization of the above anchor tension testing device: the outer side wall of the upper limit ring is fixedly connected with a plurality of rotating handles extending in the radial direction, and all the rotating handles are evenly distributed in the circumferential direction.

[0014] Beneficial effects: The present invention can provide a stable pulling force to the anchor rod, avoiding unstable pulling force caused by unstable force application by testers, thereby improving the accuracy of test results. Moreover, the present invention can be directly combined with existing anchor rod pull meters without the need to purchase new anchor rod pull meters additionally, thus reducing the usage cost. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the pull meter;

[0016] Figure 2 is a schematic overall structural diagram of the present invention;

[0017] Figure 3 is a schematic diagram of the connection mode of the side positioning plate and the screw rod;

[0018] Figure 4 is a schematic diagram of the relative position between the guiding rod and the swinging rod;

[0019] Figure 5 is a schematic diagram of the connection mode of the upper limit ring and the lower limit ring.

[0020] Description of the Drawings: 1 - swinging rod, 2 - hydraulic cylinder, 3 - manual pump, 4 - pull indicator, 5 - hydraulic jack, 6 - bottom plate, 7 - cushion block, 8 - stroke indicating benchmark, 9 - lower limit ring, 10 - end positioning plate, 11 - side positioning plate, 12 - side positioning knob, 13 - anti-slip protrusion, 14 - rotating handle, 15 - upper limit ring, 16 - guiding rod, 17 - scale line, 18 - guiding rod, 19 - top plate, 20 - soft gasket, 21 - linkage disk, 22 - connecting rod, 23 - screw rod, 24 - permanent magnet, 25 - iron bent rod, 26 - notch, 27 - rotating rod, 28 - mounting plate, 29 - mounting shaft. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 to 5, an anchor rod tensile force testing device, comprising a tensiometer. The tensiometer includes a hydraulic cylinder 2 and a hydraulic jack 5 that are interconnected, and the hydraulic cylinder 2 and the hydraulic jack 5 are connected through a manual pump 3. The manual pump 3 is rotatably connected with a swing rod 1. The device further includes a pushing mechanism for applying a thrust to the swing rod 1. The pushing mechanism includes a bottom plate 6, an upper limit ring 15, and a lower limit ring 9. Among them, the bottom plate 6 is detachably connected to the hydraulic cylinder 2. At least one set of guide rods 16 is threadedly connected inside the upper limit ring 15. The number of guide rods 16 in one set is two. The guide rods 16 are threadedly connected to the lower limit ring 9 and fixedly connected to the bottom plate 6. The swing rod 1 passes through between the two guide rods 16 in the same group and is located between the upper limit ring 15 and the lower limit ring 9.

[0023] It should be noted that in the present invention, a conventional anchor rod tensiometer is used for the tensiometer, such as an LDZ-200 type anchor rod tensiometer. In addition to the swing rod 1, the hydraulic cylinder 2, the manual pump 3, and the hydraulic jack 5, the tensiometer further includes a tensile indicator 4 connected to the manual pump 3. In the initial state, the lower limit ring 9 is connected to the guide rod 16. During use, first connect the hydraulic jack 5 to the anchor rod to be tested, then connect the hydraulic cylinder 2 to the bottom plate 6. After connection, place the bottom plate 6 on the ground for subsequent operations. Then rotate the swing rod 1 so that it passes through between the two guide rods 16 in the same group, and then connect the upper limit ring 15 to the guide rod 16. At this time, the swing rod 1 is located between the upper limit ring 15 and the lower limit ring 9. Then rotate the upper limit ring 15. Since the upper limit ring 15 is threadedly connected to the guide rod 16, the upper limit ring 15 can move downward during rotation and push the swing rod 1 to rotate, completing the manual pressurization process of the manual pump 3. If the rotation of the upper limit ring 15 stops at any position, the position of the upper limit ring 15 will be fixed, thereby providing a stable pressure to the swing rod 1, preventing the swing rod 1 from swinging slightly, enabling the hydraulic jack 5 to output a stable tensile force, and further enabling accurate testing of the anchor rod, avoiding a decrease in the accuracy of the test results due to unstable force application by the tester. The lower limit ring 9 can cooperate with the upper limit ring 15 to fully fix the position of the swing rod 1, so that the hydraulic jack 5 can maintain the magnitude of the output tensile force unchanged within a certain period of time, thereby further improving the accuracy of the test results. To avoid a decrease in the accuracy of the results due to the shaking of the tensiometer during the test, the tester can step on the bottom plate 6 to fully fix the position and posture of the tensiometer.

[0024] The detachable connection method between the bottom plate 6 and the hydraulic cylinder 2 is as follows: Two side positioning plates 11 and one end positioning plate 10 are fixedly connected to the bottom plate 6. The two side positioning plates 11 are arranged oppositely, and the hydraulic cylinder 2 is located between the two side positioning plates 11. One end of the hydraulic cylinder 2 abuts against the end positioning plate 10. A screw rod 23 passes through the side positioning plate 11. One end of the screw rod 23 is rotatably connected to a top plate 19, and the top plate 19 is located between the two side positioning plates 11. The other end of the screw rod 23 is fixedly connected to a side positioning knob 12. When connecting the bottom plate 6 and the hydraulic cylinder 2, first place the hydraulic cylinder 2 between the two side positioning plates 11, and make the hydraulic cylinder 2 closely fit with both the end positioning plate 10 and the bottom plate 6. Then rotate the side positioning knob 12. The side positioning knob 12 drives the screw rod 23 to rotate, so that the screw rod 23 moves towards the space between the two side positioning plates 11. During the movement of the screw rod 23, the screw rod 23 pushes the top plate 19 to move synchronously until the two top plates 19 clamp the hydraulic cylinder 2, and the connection can be completed. The operation of this connection method is simple, and it is not necessary to modify the structure of the hydraulic cylinder 2 itself. It has stronger versatility and can be used for different models of bolt pull meters. In other embodiments of the present invention, other detachable connection methods can also be adopted. For example, a plurality of connecting pieces are welded on the side of the hydraulic cylinder 2, and the connecting pieces are connected to the bottom plate 6 through bolts. This connection method has stronger stability, but it is necessary to modify the hydraulic cylinder 2. Different models of bolt pull meters need to be provided with corresponding bottom plates 6, and the management is relatively cumbersome.

[0025] To facilitate the rotation of the side positioning knob 12, a plurality of anti-slip protrusions 13 evenly distributed in the circumferential direction are integrally connected to the side positioning knob 12.

[0026] Although the rotatable connection between the top plate 19 and the screw rod 23 can prevent the screw rod 23 from driving the top plate 19 to rotate greatly, thereby preventing the top plate 19 from driving the hydraulic cylinder 2 to tilt, it still cannot completely prevent the top plate 19 from rotating. Therefore, a plurality of guide rods 18 parallel to the screw rod 23 are fixedly connected to the side of the top plate 19 facing the side positioning plate 11, and the guide rods 18 pass through the side positioning plate 11. A soft gasket 20 is fixedly connected to the side of the top plate 19 facing away from the side positioning plate 11. The guide rods 18 can control the direction of the top plate 19 and completely prevent the screw rod 23 from driving the top plate 19 to rotate. The soft gasket 20 can increase the friction between the top plate 19 and the hydraulic cylinder 2, thereby improving the connection strength between the bottom plate 6 and the hydraulic cylinder 2. The soft gasket 20 can be made of rubber or silicone material. Obviously, through holes corresponding to the guide rods 18 and screw holes corresponding to the screw rod 23 need to be opened on the side positioning plate 11. The through holes can either communicate with the screw holes or be separated from the screw holes. For example, in Figure 3 the screw holes communicate with the through holes, and the selection can be made according to actual needs.

[0027] The specific rotational connection mode between the top plate 19 and the screw rod 23 is as follows: A cavity is formed inside the top plate 19, and a circular linkage disk 21 is rotatably arranged in the cavity. The linkage disk 21 is coaxially and fixedly connected with a connecting rod 22, and the area of the linkage disk 21 is larger than the cross-sectional area of the connecting rod 22. After the connecting rod 22 extends out of the top plate 19, it is coaxially and fixedly connected with the screw rod 23. The linkage disk 21 can rotate in the cavity, thereby avoiding driving the top plate 19 to rotate synchronously, and at the same time, it can also push or pull the top plate 19. To implement this structure, the top plate 19 needs to be formed by laminating two layers of base plates. In other embodiments of the present invention, other rotational connection modes can also be adopted between the top plate 19 and the screw rod 23. For example, a hemispherical shell is welded on the top plate 19, and then a steel ball is rotatably arranged in the shell. The steel ball is fixedly connected with the screw rod 23 through the connecting rod 22.

[0028] In this embodiment, two groups of guide rods 16 are fixedly connected to the bottom plate 6, and all the guide rods 16 are evenly distributed along the circumferential direction of the upper limit ring 15. The total of four guide rods 16 can ensure the stability of the upper limit ring 15 and the lower limit ring 9, and avoid the inclination of the upper limit ring 15 and the lower limit ring 9 due to the too small connection area with the guide rods 16.

[0029] In the actual construction process, the test of the anchor bolts is usually carried out by sampling, that is, some samples are selected from all the anchor bolts for testing. The number of samples is usually not too large, but it is not only one or two. Therefore, the test process needs to be carried out fully for multiple times. When the models of the anchor bolts are the same, the test conditions for all samples should be the same, that is, the same tensile force is applied to all samples. To improve the test efficiency and enable the tester to quickly push the swing rod 1 to the appropriate position, a stroke indicating benchmark 8 is fixedly connected to the bottom plate 6. The stroke indicating benchmark 8 is located inside the upper limit ring 15 and the lower limit ring 9, and a plurality of scale lines 17 evenly distributed along the length direction are arranged on the stroke indicating benchmark 8. When testing the first sample, when the applied tensile force reaches the test requirement, record the scale lines 17 corresponding to the upper limit ring 15 and the lower limit ring 9 as the target positions. In the subsequent test process, the upper limit ring 15 can be quickly rotated to the target position without gradually increasing the formation of the upper limit ring 15, so as to quickly complete the test.

[0030] After the position of the swing rod 1 is defined by the upper limit ring 15 and the lower limit ring 9, the upper limit ring 15 and the lower limit ring 9 can be rotated synchronously to finely adjust the swing rod 1. To facilitate the synchronous rotation of the upper limit ring 15 and the lower limit ring 9, a plurality of rotating rods 27 evenly distributed in the circumferential direction are rotatably connected to the outer side of the upper limit ring 15. One end of the rotating rod 27 far from the upper limit ring 15 is fixedly connected with an iron bent rod 25. When the rotating rod 27 is parallel to the axis of the upper limit ring 15, the iron bent rod 25 faces the inner side of the upper limit ring 15. A plurality of notches 26 evenly distributed in the circumferential direction are formed on the outer wall of the lower limit ring 9. The width of the notch 26 is equal to the diameter of the iron bent rod 25, and a permanent magnet 24 is embedded in the notch 26. After the position of the swing rod 1 is defined by the upper limit ring 15 and the lower limit ring 9, rotate the rotating rod 27 to insert the iron bent rod 25 into the notch 26. At this time, the permanent magnet 24 adsorbs the iron bent rod 25, thus completing the connection between the upper limit ring 15 and the lower limit ring 9. After the connection is completed, when the upper limit ring 15 is rotated, the iron bent rod 25 and the rotating rod 27 can generate a thrust on the side wall of the notch 26, thereby driving the lower limit ring 9 to rotate synchronously. To ensure that the iron bent rod 25 can be smoothly inserted into the notch 26, the number of notches 26 needs to be greater than the number of iron bent rods 25. In this embodiment, the number of rotating rods 27 and iron bent rods 25 is both set to two, and the number of notches 26 is set to sixteen. All the notches 26 are evenly distributed along the circumferential direction of the lower limit ring 9.

[0031] The specific setting method of the rotating rod 27 is as follows: One end of the rotating rod 27 close to the upper limit ring 15 is rotatably connected with a mounting shaft 29. Two mounting plates 28 are fixedly connected to both ends of the mounting shaft 29, and the mounting plates 28 are fixedly connected with the upper limit ring 15.

[0032] To facilitate the rotation of the upper limit ring 15, a plurality of radially extending rotating handles 14 are fixedly connected to the outer side wall of the upper limit ring 15, and all the rotating handles 14 are evenly distributed in the circumferential direction. The lower limit ring 9 can also be connected with a plurality of rotating handles 14.

[0033] Considering that the hydraulic cylinder 2 will obstruct the swing rod 1, a cushion block 7 can be arranged on the bottom plate 6. The cushion block 7 jacks up the lower limit ring 9, which can reduce the effective stroke of the lower limit ring 9 and can rotate the lower limit ring 9 to the state of cooperating with the upper limit ring 15 to fix the position of the swing rod 1 more quickly, thereby improving the test efficiency.

[0034] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anchor rod tensile force testing device, comprising a tensiometer. The tensiometer includes a hydraulic cylinder (2) and a hydraulic jack (5) that are interconnected, and the hydraulic cylinder (2) and the hydraulic jack (5) are connected through a manual pump (3). The manual pump (3) is rotatably connected to a swing rod (1), and is characterized in that: The device further comprises a pushing mechanism for applying a thrust to the swing rod (1), the pushing mechanism comprising a bottom plate (6), an upper stop ring (15) and a lower stop ring (9), wherein the bottom plate (6) is detachably connected to the hydraulic cylinder (2), the upper stop ring (15) is threadedly connected to at least one group of guide rods (16) on the inner side, the number of the guide rods (16) in a group is two, the guide rods (16) are threadedly connected to the lower stop ring (9) and are fixedly connected to the bottom plate (6), and the swing rod (1) passes between the two guide rods (16) in the same group and is located between the upper stop ring (15) and the lower stop ring (9); The bottom plate (6) is fixedly connected to two groups of guide rods (16), and all the guide rods (16) are evenly distributed along the circumferential direction of the upper limit ring (15); The outer side of the upper limit ring (15) is rotatably connected to a plurality of rotating rods (27) evenly distributed in the circumferential direction, and one end of the rotating rod (27) away from the upper limit ring (15) is fixedly connected to an iron bending rod (25). When the rotating rod (27) is parallel to the axis of the upper limit ring (15), the iron bending rod (25) faces the inner side of the upper limit ring (15). The outer wall of the lower limit ring (9) is provided with a plurality of notches (26) evenly distributed in the circumferential direction, the width of the notches (26) is equal to the diameter of the iron bending rod (25), and a permanent magnet (24) is embedded in the notch (26).

2. The anchor rod tensile force testing device according to claim 1, wherein: The bottom plate (6) is fixedly connected to two side positioning plates (11) and an end positioning plate (10), wherein the two side positioning plates (11) are arranged opposite to each other, the hydraulic cylinder (2) is located between the two side positioning plates (11), and one end of the hydraulic cylinder (2) is against the end positioning plate (10), a screw rod (23) is passed through the side positioning plate (11), one end of the screw rod (23) is rotatably connected to a top plate (19), and the top plate (19) is located between the two side positioning plates (11), and the other end of the screw rod (23) is fixedly connected to a side positioning knob (12).

3. The anchor rod tensile force testing device according to claim 2, characterized in that: A plurality of guide rods (18) parallel to the screw rods (23) are fixedly connected to the side of the top plate (19) facing the side positioning plate (11), and the guide rods (18) pass through the side positioning plate (11). A soft gasket (20) is fixedly connected to the side of the top plate (19) facing away from the side positioning plate (11).

4. The anchor rod tensile force testing device according to claim 2, wherein: A cavity is provided inside the top plate (19), in which a circular linkage disk (21) is rotatably arranged. The linkage disk (21) is coaxially fixedly connected to a connecting rod (22), and the area of ​​the linkage disk (21) is larger than the cross-sectional area of ​​the connecting rod (22). After the connecting rod (22) extends out of the top plate (19), it is coaxially fixedly connected to the screw rod (23).

5. The anchor rod tension testing device according to claim 1, characterized in that: The bottom plate (6) is fixedly connected to a travel indicator rod (8), the travel indicator rod (8) is located inside the upper limit ring (15) and the lower limit ring (9), and the travel indicator rod (8) is provided with a plurality of scale lines (17) evenly distributed along the length direction.

6. The anchor rod tensile force testing device according to claim 1, characterized in that: One end of the rotating rod (27) close to the upper limit ring (15) is rotatably connected to a mounting shaft (29). Two mounting plates (28) are fixedly connected to both ends of the mounting shaft (29), and the mounting plates (28) are fixedly connected to the upper limit ring (15).

7. The anchor rod tensile force testing device according to claim 1, characterized in that: A plurality of radially extending rotating handles (14) are fixedly connected to the outer side wall of the upper limit ring (15), and all the rotating handles (14) are evenly distributed in the circumferential direction.

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