Device for testing dynamic bearing capacity of anchor rod based on Hopkinson pressure bar

Abstract

The utility model belongs to the technical field of anchor rod testing devices, and discloses an anchor rod dynamic bearing capacity testing device based on a Hopkinson pressure bar. According to the anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar, the telescopic end of the hydraulic jack extends out relative to the fixed end to apply pre-tightening force to the to-be-tested anchor rod, the pre-tightening force of the to-be-tested anchor rod is monitored through the anchor rod pre-tightening force measuring device, the pre-tightening force is accurately applied to the to-be-tested anchor rod, and operation is convenient; a bullet is launched to the end face of the incident rod through the launcher, the dynamic load impact of the bullet on the incident rod is transmitted to the to-be-tested anchor rod through the force transmission frame, the dynamic load impact is applied to the to-be-tested anchor rod, and the dynamic bearing capacity of the anchor rod is tested; in the process, the actual working condition of the anchor rod support is accurately simulated, the speed of the bullet is monitored through the speed acquisition instrument, and the strain data of the anchor rod to be tested are acquired through the strain acquisition instrument, so that the dynamic bearing capacity parameters of the anchor rod are accurately tested.

Description

Technical Field

[0001] This utility model relates to the technical field of anchor bolt testing devices, specifically to an anchor bolt dynamic bearing capacity testing device based on Hopkinson bar. Background Technology

[0002] Rock bolt support, with its advantages of simple installation and low cost, has become one of the most important support methods for coal mine roadways. However, as shallow coal resources are gradually depleted and coal mining shifts from shallow to deep, the increased coal burial depth leads to increasingly complex surrounding rock conditions and frequent dynamic disasters, the most typical of which is rockburst. Therefore, in roadway support where rockburst is frequent, the dynamic load impact resistance of the rock bolts used needs to be measured to guide the support design of rockburst-prone roadways. Designing a testing device that fits the actual working conditions is a prerequisite for accurately testing the dynamic bearing capacity parameters of the rock bolts. Based on this, a dynamic bearing capacity testing device for rock bolts based on Hopkinson bars is proposed. Utility Model Content

[0003] The purpose of this invention is to propose a dynamic bearing capacity testing device for anchor bolts based on Hopkinson bar, so as to accurately simulate the actual working conditions of anchor bolt support and accurately test the dynamic bearing capacity parameters of anchor bolts.

[0004] To achieve the above objectives, this utility model adopts the following technical solution:

[0005] A dynamic bearing capacity testing device for anchor bolts based on Hopkinson bar compression, comprising:

[0006] A support platform with slide rails arranged along the axial direction of the support platform;

[0007] A support base is fixedly connected to the support platform;

[0008] The support slide is slidably fitted with the slide rail and can move closer to or further away from the support fixing seat;

[0009] A hydraulic jack is mounted on the support slide.

[0010] The anchor rod to be tested has one end connected to the telescopic end of a hydraulic jack, and the other end connected to an anchor, which abuts against the support fixing seat.

[0011] The force transmission frame is slidably fitted with the support and fixing seat. One end of the force transmission frame is connected to a hydraulic jack, and the other end of the force transmission frame is provided with an incident rod.

[0012] A launcher, mounted on the support platform, is used to fire a bullet at the end face of the incident rod;

[0013] A velocity acquisition device is used to monitor the velocity of a bullet;

[0014] A strain acquisition instrument is used to collect strain data of the anchor rod under test.

[0015] Furthermore, the transmitter includes a launch chamber, a pressure chamber, an electromagnetic gate, and a high-pressure gas cylinder;

[0016] The launch chamber is used to hold bullets. The launch chamber is set on the support platform. One end of the launch chamber is connected to the pressure chamber. An electromagnetic gate is set between the pressure chamber and the launch chamber. The gas supply interface of the high-pressure gas cylinder is connected to the pressure chamber via a pipeline.

[0017] Furthermore, the transmitter also includes a launch support base, which is disposed on the support platform, and the launch compartment is disposed on the launch support base.

[0018] Furthermore, the high-pressure gas cylinder is filled with nitrogen.

[0019] Furthermore, it also includes a transmitter controller, which is connected to the control terminal of the electromagnetic gate via a signal cable.

[0020] Furthermore, the force transmission frame includes a sliding rod, a first end seat, and a second end seat. The sliding rod is slidably engaged with the support fixing seat. One end of the sliding rod is connected to the first end seat, which is connected to a hydraulic jack. The other end of the sliding rod is connected to the second end seat, and the incident rod is disposed on the second end seat.

[0021] Furthermore, the support fixing base is provided in two parts, which are arranged sequentially along the axial direction of the support platform, with a space left between the two support fixing bases.

[0022] Furthermore, an assembly hole is provided in the middle of the anchor, and the other end of the anchor rod to be tested extends into the assembly hole. The other end of the anchor rod to be tested is connected to the assembly hole via an anchoring agent.

[0023] Furthermore, it also includes an anchor bolt preload force measuring device for monitoring the preload force of the anchor bolt under test.

[0024] Furthermore, it also includes a hydraulic loading controller, which is connected to the control end of the hydraulic jack via a signal cable.

[0025] The beneficial effects of this utility model are as follows:

[0026] This invention proposes a dynamic bearing capacity testing device for anchor bolts based on Hopkinson pressure bars. A hydraulic jack extends its telescopic end relative to the fixed end to apply a preload to the anchor bolt under test. The preload is monitored by an anchor bolt preload measuring device, ensuring precise application of the preload and convenient operation. A projectile is fired at the end face of the incident rod via a launcher, and the dynamic impact of the projectile on the incident rod is transmitted to the anchor bolt under test via a force transmission frame, applying a dynamic impact to test the anchor bolt's dynamic bearing capacity. During this process, the actual working conditions of the anchor bolt support are accurately simulated. The velocity of the projectile is monitored by a velocity acquisition instrument, and the strain data of the anchor bolt under test is collected by a strain acquisition instrument to accurately test the dynamic bearing capacity parameters of the anchor bolt. Attached Figure Description

[0027] Figure 1 This is a perspective view of the anchor dynamic bearing capacity testing device based on the Hopkinson bar of this utility model.

[0028] Figure 2 This is an end view of the force transmission frame in the anchor dynamic bearing capacity testing device based on Hopkinson bar of this utility model;

[0029] Figure label:

[0030] 1. Support platform; 11. Slide rail; 21. Support fixing seat; 22. Support slide; 23. Launch support seat; 3. Hydraulic jack; 4. Anchor bolt to be tested; 41. Anchor bolt; 51. Velocity acquisition instrument; 52. Strain acquisition instrument; 53. Launch controller; 54. Anchor bolt preload force measuring device; 55. Hydraulic loading controller; 6. Incident rod; 71. Slide rod; 72. First end seat; 73. Second end seat; 731. Lead screw; 81. Bullet; 82. Launch chamber; 83. Pressure chamber; 9. Host computer. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Combination Figure 1 , Figure 2 As shown, this utility model proposes a dynamic bearing capacity testing device for anchor bolts based on Hopkinson bar, including a support platform 1, a support fixing seat 21, a support slide 22, a hydraulic jack 3, the anchor bolt to be tested 4, a force transmission frame, a transmitter, a velocity acquisition instrument 51, and a strain acquisition instrument 52, etc.

[0034] A slide rail 11 is provided on the support platform 1, and the slide rail 11 is arranged along the axial direction of the support platform 1.

[0035] The support fixing base 21 is fixedly connected to the support platform 1. There are two support fixing bases 21, which are arranged sequentially along the axial direction of the support platform, with a space between them. The space between the two support fixing bases 21 is used to facilitate the placement of strain sensor devices on the anchor rod 4 to be tested.

[0036] The support slide 22 slides along the slide rail 11, and can move closer to or further away from the support fixed seat 21.

[0037] The hydraulic jack 3 is mounted on the support slide 22, which moves along the slide rail 11 to drive the hydraulic jack 3 to move.

[0038] One end of the anchor rod 4 to be tested is connected to the telescopic end of the hydraulic jack 3, and the other end of the anchor rod 4 is connected to an anchor 41, which abuts against the end face of a support fixing seat 21. The anchor 41 is made of stainless steel, with an outer diameter of 70 mm and a length of 400 mm. An assembly hole with a depth of 300 mm is opened in the middle of the anchor 41. The other end of the anchor rod 4 to be tested extends into the assembly hole and is connected to the assembly hole via an anchoring agent.

[0039] One end of the anchor rod 4 to be tested is connected to a nut. An anchor rod preload force measuring device 54 is set between the hydraulic jack 3 and the nut. The telescopic end of the hydraulic jack 3 extends relative to the fixed end. After the anchor rod 4 to be tested is preloaded, the anchor rod preload force measuring device 54 monitors the preload force of the anchor rod 4 to be tested.

[0040] The hydraulic loading controller 55 is connected to the control terminal of the hydraulic jack 3 via a signal cable.

[0041] The force transmission frame is slidably supported by a fixed base 21. One end of the force transmission frame is connected to a hydraulic jack 3, and the other end of the force transmission frame is equipped with an incident rod 6. The incident rod 6 is made of tungsten steel, with a diameter of 50 mm and a length of 100 mm.

[0042] The force transmission frame includes a slide rod 71, a first end seat 72, and a second end seat 73. The slide rod 71 has a diameter of 50mm and a length of 1200mm. Two slide rods 71 ​​are arranged longitudinally. Two sliding engagement holes are formed longitudinally on the support fixing seat 21, and the slide rod 71 slides into these holes. Specifically, several rollers are installed within the sliding engagement holes, and the slide rod 71 rolls in contact with these rollers. One end of the slide rod 71 is connected to the first end seat 72, which is connected to the fixed end of the hydraulic jack 3. The other end of the slide rod 71 is connected to the second end seat 73, and an incident rod 6 is positioned at the center of the second end seat 73. The lower end of the second end seat 73 is connected to a support slide 22, which slides into a slide rail 11. The second end seat 73 is designed as a ring structure, and three lead screws 731 are evenly spaced along the circumference of the second end seat 73. Tightening the lead screws 731 clamps and fixes the incident rod 6.

[0043] The launcher is mounted on the support platform 1 and is used to fire bullet 81 at the end face of the incident rod 6. Bullet 81 is spindle-shaped, with a diameter of 50mm at its thickest end and a total length of 150mm.

[0044] The launcher includes a launch chamber 82, a pressure chamber 83, an electromagnetic gate, and a high-pressure gas cylinder 84. The launch chamber is used to hold the bullet 81. The launch support 23 is set on the support platform 1. The launch chamber 82 is set on the launch support 23. One end of the launch chamber 82 is connected to the pressure chamber 83 via a flange. An electromagnetic gate is set between the pressure chamber 83 and the launch chamber 82. The gas supply interface of the high-pressure gas cylinder 84 is connected to the pressure chamber 83 via a pipeline.

[0045] The high-pressure gas cylinder 84 is filled with high-pressure nitrogen and provides power for the firing of the bullet 81. A pressure gauge is installed on the pipeline between the gas supply port of the high-pressure gas cylinder 84 and the pressure chamber 83 to monitor the pressure of the high-pressure nitrogen in the pressure chamber 83.

[0046] The launch controller 53 is connected to the control terminal of the electromagnetic gate via a signal cable. The launch controller 53 triggers the electromagnetic gate to open, and the high-pressure nitrogen gas in the pressure chamber 83 impacts the bullet 81 in the launch chamber 82, so as to launch the bullet 81 from the launch chamber 82 toward the incident rod 6.

[0047] The velocity acquisition device 51 is specifically a laser velocimeter used to monitor the firing velocity of the bullet 81.

[0048] The strain acquisition instrument 52 is used to collect strain data of the anchor rod 4 under test. Specifically, strain gauges are attached to the anchor rod 4 under test. The strain gauges are connected to the strain acquisition instrument 52 via signal cables. The strain data (strain rate of the anchor rod under dynamic load) is collected by the strain gauges and uploaded to the strain acquisition instrument 52.

[0049] The host computer 9 is connected to the speed acquisition instrument 51, strain acquisition instrument 52, transmission controller 53, anchor bolt preload force measuring device 54 and hydraulic loading controller 55 via signal cables to realize data upload and control signal transmission.

[0050] The present invention has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the dynamic bearing capacity testing device for anchor bolts based on Hopkinson bar. The dynamic bearing capacity testing device for anchor bolts based on Hopkinson bar described in this invention applies a preload to the anchor bolt 4 under test by extending the telescopic end of the hydraulic jack 3 relative to the fixed end, and monitors the preload of the anchor bolt 4 under test through the anchor bolt preload force measuring device 54. This allows for precise application of the preload to the anchor bolt 4 under test, and is easy to operate. A bullet 81 is fired at the end face of the incident rod 6 by a launcher, and the dynamic load impact of the bullet 81 on the incident rod 6 is transmitted to the anchor bolt 4 under test through a force transmission frame, applying a dynamic load impact to the anchor bolt 4 under test and testing its dynamic bearing capacity. In the above process, the actual working conditions of anchor bolt support are accurately simulated. The velocity of the bullet is monitored by the velocity acquisition instrument 51, and the strain data of the anchor bolt under test is collected by the strain acquisition instrument 52 to accurately test the dynamic bearing capacity parameters of the anchor bolt.

[0051] Of course, the above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model and should be protected by the present utility model.

Claims

1. A Hopkinson pressure bar based dynamic load bearing capacity testing device for rock bolts, characterized in that, The device comprises: a support table, on which a slide rail is arranged along the axial direction of the support table; a support fixed seat, which is fixedly connected to the support table; a support sliding seat, which is slidably connected to the slide rail and can move towards or away from the support fixed seat; a hydraulic jack, which is arranged on the support sliding seat; a to-be-tested anchor rod, one end of which is connected to the telescopic end of the hydraulic jack, and the other end of which is connected to an anchoring member, which abuts against the support fixed seat; a force transmission frame, which is slidably connected to the support fixed seat, one end of which is connected to the hydraulic jack, and the other end of which is provided with an incident rod; a launcher, which is arranged on the support table and is used for launching a bullet to the end face of the incident rod; a speed acquisition instrument, which is used for monitoring the speed of the bullet; a strain acquisition instrument, which is used for acquiring the strain data of the to-be-tested anchor rod.

2. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 1, wherein the launcher comprises a launching cabin, a pressure cabin, an electromagnetic gate and a high-pressure gas cylinder.

3. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 2, wherein the launcher further comprises a launching support seat, which is arranged on the support table, and the launching cabin is arranged on the launching support seat.

4. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 2, wherein the high-pressure gas cylinder is filled with nitrogen.

5. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 2, further comprising a launching controller, which is connected to the control end of the electromagnetic gate through a signal cable.

6. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 1, wherein the force transmission frame comprises a slide rod, a first end head seat and a second end head seat, the slide rod is slidably connected to the support fixed seat, one end of the slide rod is connected to the first end head seat, the first end head seat is connected to the hydraulic jack, the other end of the slide rod is connected to the second end head seat, and the incident rod is arranged on the second end head seat.

7. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 1, wherein the support fixed seat is arranged in two, the two support fixed seats are arranged along the axial direction of the support table in sequence, and a space is left between the two support fixed seats.

8. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 1, wherein an assembly hole is arranged at the middle position of the anchoring member, the other end of the to-be-tested anchor rod is inserted into the assembly hole, and the other end of the to-be-tested anchor rod is connected to the assembly hole through an anchoring agent.

9. The anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar according to claim 1, further comprising an anchor rod pre-tightening force measuring device, which is used for monitoring the pre-tightening force of the to-be-tested anchor rod. ​ ​ ​ ​ ​ ​ ​ ​ ​ 10. The anchor bolt dynamic bearing capacity testing device based on Hopkinson bar according to claim 1, characterized in that, It also includes a hydraulic loading controller, which is connected to the control end of the hydraulic jack via a signal cable.

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