An overload protection type displacement meter support for steel support experiment

Abstract

The utility model discloses a kind of overload protection formula displacement meter support for steel support experiment, it is related to displacement meter support technical field, including displacement meter body, magnetic attraction base and mounting bracket, the mounting bracket includes vertical pole, swing arm and telescopic rod;The utility model when test piece deformation is too large, displacement is about to exceed displacement measurement range, force acting on swing arm can overcome the preset resistance provided by resistance unit, force telescopic rod to extend and retract action to release the force of overload, and drive swing arm and displacement meter overall inclination, rather than destructive force is directly transmitted to displacement meter body.This fundamentally avoids the sensor core body damage, structural member plastic deformation or signal failure etc. problems that expensive displacement meter occurs due to overrange work, significantly reduces experimental cost and the delay of construction period caused by instrument damage.

Description

Technical Field

[0001] This utility model relates to the field of displacement gauge support technology, and in particular to an overload protection displacement gauge support for steel support experiments. Background Technology

[0002] In full-scale model tests of multi-limb composite steel support nodes in deep foundation pits, displacement gauges are crucial sensors for measuring the deformation response of specimens under load. Currently, displacement gauges are typically fixed to the specimen or reaction frame using a magnetic base and rigid support to achieve real-time monitoring of displacement at key sections. However, during actual loading, especially when the specimen enters the elasto-plastic stage or undergoes significant deformation, displacement gauges often face the risk of being crushed or damaged due to limited range or excessively rigid support. For example, in splice node tests, mid-span displacement can reach over 30 mm, far exceeding the rated range of some displacement gauges. If the support fails to release or trigger an alarm in time, it can not only lead to sensor damage and data loss but also potentially compromise test safety.

[0003] In existing technologies, displacement gauge supports mostly use rigid connections, lacking an adaptive protection mechanism against excessive deformation. Therefore, there is an urgent need to design an intelligent displacement gauge support with overload protection, capable of automatically bending or breaking when the displacement exceeds the limit, and simultaneously triggering an alarm, thereby effectively protecting the displacement gauge and alerting the test personnel to intervene in a timely manner.

[0004] This utility model aims to solve the above-mentioned technical problems and provides an overload protection displacement gauge bracket that is simple in structure, sensitive in response, and reusable. It is suitable for large deformation test scenarios of steel structure support systems and has good engineering applicability and economy. Utility Model Content

[0005] This invention provides an overload protection displacement gauge bracket for steel support experiments, which solves the technical problem of the lack of an adaptive protection mechanism for excessive deformation in the current technology.

[0006] To solve the above-mentioned technical problems, this utility model provides an overload protection displacement gauge support for steel support experiments, including a displacement gauge body, a magnetic base, and a mounting bracket. The mounting bracket includes a vertical rod, a swing arm, and a telescopic rod. The bottom end of the vertical rod is fixedly connected to the magnetic base, and the top end of the vertical rod is hinged to one end of the swing arm. The other end of the swing arm is provided with a fixing clamp for holding the displacement gauge body, and the displacement gauge body is connected to the fixing clamp. The telescopic rod has a first hinge seat and a second hinge seat hinged at both ends. The first hinge seat is slidably sleeved on the vertical rod, and the second hinge seat is slidably sleeved on the swing arm. The telescopic rod includes a sleeve rod and an inner rod, and the inner rod and the sleeve rod are slidably sleeved together. The telescopic rod is provided with a resistance adjustment component, which is used to provide a preset resistance to limit the relative sliding of the inner rod and the sleeve rod to maintain the stability of the support, and allows the inner rod and the sleeve rod to slide relative to each other when the displacement gauge body reaches its measuring range.

[0007] Preferably, the resistance adjustment component includes a rubber sleeve that is fitted onto the surface of the inner rod, and the rubber sleeve is interference-fitted with the surface of the inner rod to provide the preset resistance.

[0008] Preferably, the resistance adjustment assembly includes a movable sleeve, a mounting base, a fastening screw, a sliding block, and a friction block; the movable sleeve is sleeved on the outside of the sleeve rod, the mounting base is fixed to the side of the movable sleeve, and the fastening screw is threadedly connected to the mounting base; a side groove is formed on the side of the movable sleeve, the sliding block is slidably disposed in the side groove, and the friction block is fixed on the side of the sliding block facing the inner rod and in pressure contact with the surface of the inner rod; the end of the fastening screw is in pressure contact with the side of the sliding block away from the inner rod, so as to change the pressure between the friction block and the inner rod by adjusting the screwing depth, thereby adjusting the preset resistance.

[0009] Preferably, the resistance adjustment assembly includes a stainless steel ring, a fixed ring seat, and a permanent magnet; the stainless steel ring is embedded in the surface of the inner rod, the fixed ring seat is fixed to the top of the sleeve rod, and the permanent magnet is ring-shaped and disposed inside the fixed ring seat; the attraction force between the permanent magnet and the stainless steel ring constitutes the preset resistance, and when the inner rod and the sleeve rod slide relative to each other, the stainless steel ring can move with the inner rod and leave the attraction range of the permanent magnet.

[0010] Preferably, it also includes an angle sensor and a sensor mounting bracket; the sensor mounting bracket is fixed to the top of the upright, the angle sensor is fixed to the side of the sensor mounting bracket, and the detection axis of the angle sensor is coaxial with the hinge axis of the upright and the swing arm and connected to the swing arm, for detecting the rotation angle of the swing arm relative to the upright.

[0011] Preferably, both the first hinge seat and the second hinge seat include a clamping ring and a locking bolt. The clamping ring is detachably fitted onto the upright or the swing arm, and the locking bolt passes through the open and closed end of the clamping ring to adjust the clamping force between the clamping ring and the upright or the swing arm by tightening or loosening.

[0012] Preferably, the rubber sleeve is made of nitrile rubber or silicone.

[0013] Preferably, the friction block is made of polytetrafluoroethylene or rubber, and the surface of the friction block that contacts the inner rod is provided with anti-slip texture.

[0014] Preferably, the inner side of the permanent magnet is the S pole and the outer side is the N pole.

[0015] Preferably, the bottom end of the upright is fixed to the magnetic base by threaded connection or welding, and the bottom surface of the magnetic base is provided with an anti-slip pad.

[0016] Compared with related technologies, the overload protection displacement gauge bracket for steel support experiments provided by this utility model has the following advantages:

[0017] This invention provides an overload-protected displacement gauge support for steel support experiments. By incorporating a telescopic rod mechanism consisting of a sleeve, inner rod, and resistance-providing unit, hinged between the upright and the swing arm, the support cleverly transforms a rigid connection into a controllable flexible one. When the specimen deforms excessively and the displacement is about to exceed the displacement measurement range, the force acting on the swing arm overcomes the preset resistance provided by the resistance unit, forcing the telescopic rod to extend or retract, thereby releasing the overload force and causing the swing arm and displacement gauge to tilt as a whole, rather than directly transmitting the destructive force to the displacement gauge body. This fundamentally avoids problems such as sensor core damage, structural plastic deformation, or signal failure caused by over-range operation of expensive displacement gauges, significantly reducing experimental costs and project delays due to instrument damage.

[0018] This invention provides an overload protection displacement gauge bracket for steel support experiments, offering various implementation schemes for the resistance supply unit. Among these, the friction damper scheme allows for continuous adjustment of the clamping force on the inner rod by tightening the fastening screws, thus steplessly adjusting the force required to trigger protection. This enables the same bracket to flexibly and accurately set the most suitable overload protection point based on the range of different displacement gauges and the expected maximum deformation under different experimental conditions. Its high versatility significantly improves the equipment's reusability and application range. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the telescopic pole installation structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the present invention during experimentation;

[0022] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0023] Figure 5 This is a cross-sectional structural diagram of Embodiment 2 of the present invention;

[0024] Figure 6 This is a cross-sectional structural diagram of Embodiment 3 of the present invention.

[0025] The following are the labeling elements in the diagram: 1. Displacement gauge body; 2. Magnetic base; 3. Upright pole; 4. Swing arm; 5. Angle sensor; 6. Fixing clamp; 7. Telescopic rod; 9. Sensor mounting bracket; 71. First hinge seat; 72. Second hinge seat; 73. Sleeve; 74. Inner rod; 81. Rubber sleeve; 821. Movable sleeve; 822. Mounting seat; 823. Fastening screw; 824. Sliding block; 825. Friction block; 831. Stainless steel ring; 832. Fixed ring seat; 833. Permanent magnet; 100. Hydraulic drive rod; 200. Component under test; 300. Support rod; 400. Support seat. Detailed Implementation

[0026] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0027] The present invention discloses an overload protection displacement gauge bracket for steel support experiments, which aims to solve the problem that existing displacement gauge brackets are prone to damage when the specimen undergoes large deformation due to excessive rigidity and lack of overload protection mechanism. It features simple structure, sensitive response, and reusability.

[0028] like Figure 1 As shown, the bracket includes a displacement gauge body 1, a magnetic base 2, and a mounting bracket. The mounting bracket, which is the core load-bearing and adjustment structure, includes a vertical rod 3, a swing arm 4, and a telescopic rod 7.

[0029] The test piece 200 is mounted on two support rods 300. The test piece 200 is pressured by driving the hydraulic drive rod 100 to complete the experiment.

[0030] The bottom end of the upright pole 3 is connected to the magnetic base 2. The magnetic base 2 has a clamping structure with fastening bolts on its side. The magnetic base 2 is used to attach and fix the entire bracket to the support base 400. The bottom surface of the magnetic base 2 is provided with an anti-slip pad to enhance stability. The top end of the upright pole 3 is hinged to one end of the swing arm 4, so that the swing arm 4 can rotate relative to the upright pole 3, thereby adjusting the monitoring angle of the displacement meter body 1.

[0031] The other end of the swing arm 4 is connected to a fixing clip 6, which is used to hold and fix the displacement gauge body 1, ensuring that the detection end of the displacement gauge body 1 is aligned with the monitoring point of the test piece 200. The connection between the displacement gauge body 1 and the fixing clip 6 can be achieved by bolt fastening or elastic clamping, ensuring that the displacement gauge body 1 does not loosen during the monitoring process.

[0032] The telescopic rod 7 connects the upright 3 and the swing arm 4, with a first hinge seat 71 and a second hinge seat 72 hinged at both ends. The first hinge seat 71 is slidably fitted onto the upright 3, and the second hinge seat 72 is slidably fitted onto the swing arm 4. By adjusting the positions of the first hinge seat 71 and the second hinge seat 72, the support angle of the telescopic rod 7 on the swing arm 4 can be changed, thus adapting to different monitoring scenarios. Specifically, both the first hinge seat 71 and the second hinge seat 72 include a clamping ring and a locking bolt. The clamping ring is slidably fitted onto the upright 3 or the swing arm 4, and the locking bolt passes through the open and closed end of the clamping ring. Tightening the locking bolt can enhance the clamping force between the clamping ring and the upright 3 or the swing arm 4, achieving position fixation; loosening the locking bolt allows for sliding adjustment of the position.

[0033] The telescopic rod 7 includes a sleeve rod 73 and an inner rod 74. The inner rod 74 and the sleeve rod 73 are slidably fitted together, allowing the telescopic rod 7 to extend and retract to accommodate the rotation of the swing arm 4. The telescopic rod 7 is equipped with a resistance adjustment component, which provides a preset resistance to limit the relative sliding between the inner rod 74 and the sleeve rod 73. This ensures that the swing arm 4 remains stable within the range of the displacement gauge body 1, thus guaranteeing monitoring accuracy. When the displacement gauge body 1 reaches the range, the force on the swing arm 4 increases and overcomes the preset resistance, causing the inner rod 74 and the sleeve rod 73 to slide relative to each other, thereby preventing damage to the displacement gauge body 1 and the support due to excessive force.

[0034] The resistance adjustment component can be implemented in the following three ways:

[0035] Example 1

[0036] like Figure 1 As shown, the resistance adjustment assembly includes a rubber sleeve 81, which is fitted onto the surface of the inner rod 74 and has an interference fit with the inner wall of the rod 73. The rubber sleeve 81 is made of nitrile rubber or silicone, and the friction between it and the inner wall of the rod 73 constitutes a preset resistance. When the force on the swing arm 4 is less than the preset resistance, the inner rod 74 and the rod 73 remain relatively stationary; when the force exceeds the preset resistance, the rubber sleeve 81 is deformed by compression on the rod 73, and the inner rod 74 slides relative to the rod 73, thus achieving overload protection.

[0037] Example 2

[0038] like Figure 4-5As shown, the resistance adjustment assembly includes a movable sleeve 821, a mounting base 822, a fastening screw 823, a sliding block 824, and a friction block 825. The movable sleeve 821 is fitted onto the outside of the sleeve rod 73, the mounting base 822 is fixed to the side of the movable sleeve 821, and the fastening screw 823 is threadedly connected to the mounting base 822. A side groove is formed on the side of the movable sleeve 821, and the sliding block 824 is slidably disposed within the side groove. The friction block 825 is fixed to the side of the sliding block 824 facing the inner rod 74 and is in pressure contact with the surface of the inner rod 74. The friction block 825 is made of polytetrafluoroethylene or rubber, and its surface has anti-slip textures to enhance the friction with the inner rod 74. By adjusting the screwing depth of the fastening screw 823, the pressure exerted on the sliding block 824 can be changed, thereby adjusting the friction between the friction block 825 and the inner rod 74 to adapt to the needs of displacement gauges with different ranges.

[0039] Example 3

[0040] like Figure 6 As shown, the resistance adjustment assembly includes a stainless steel ring 831, a fixed ring seat 832, and a permanent magnet 833. The stainless steel ring 831 is embedded in the surface of the inner rod 74, the fixed ring seat 832 is fixed to the top of the sleeve rod 73, and the permanent magnet 833 is ring-shaped and located inside the fixed ring seat 832. The inner side of the permanent magnet 833 is the S pole, and the outer side is the N pole. The attraction force between the permanent magnet 833 and the stainless steel ring 831 constitutes the preset resistance. When the force on the swing arm 4 is less than the attraction force, the inner rod 74 and the sleeve rod 73 remain relatively stationary; when the force exceeds the attraction force, the stainless steel ring 831 moves with the inner rod 74 and moves out of the attraction range of the permanent magnet 833, and the inner rod 74 slides relative to the sleeve rod 73, thus achieving overload protection.

[0041] To further monitor the rotation angle of the swing arm 4, the bracket also includes an angle sensor 5 and a sensor mounting bracket 9. The sensor mounting bracket 9 is fixed to the top of the upright 3, and the angle sensor 5 is fixed to the side of the sensor mounting bracket 9. Its detection axis is coaxial with the hinge axis of the upright 3 and the swing arm 4 and is connected to the swing arm 4. When the swing arm 4 rotates, the angle sensor 5 can detect the rotation angle in real time and transmit the data. It can be connected to an external alarm device or uploaded to the cloud, which makes it convenient for testers to grasp the deformation state of the specimen and intervene in the test process in a timely manner.

[0042] The working principle of this utility model is as follows: Before the test, the bracket is fixed by the magnetic base 2, and the angle of the swing arm 4 and the positions of the first hinge seat 71 and the second hinge seat 72 are adjusted so that the displacement gauge body 1 is aligned with the monitoring point. At this time, the resistance adjustment component provides the preset resistance, and the telescopic rod 7 keeps its length unchanged to ensure that the displacement gauge body 1 can stably monitor within the range. When the deformation of the specimen increases to the displacement measurement range, the force on the swing arm 4 exceeds the preset resistance, the inner rod 74 and the sleeve rod 73 slide relative to each other, and the swing arm 4 rotates with the deformation of the specimen to avoid overload of the displacement gauge body 1 and the bracket. At the same time, the angle sensor 5 monitors the rotation angle of the swing arm 4 in real time and provides an early warning signal to the test personnel.

[0043] The above description is only a specific embodiment of this utility model, and its structure is not limited to the above form. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An overload-protected displacement gauge support for steel support experiments, comprising a displacement gauge body, a magnetic base, and a mounting bracket, characterized in that: The mounting bracket includes a vertical pole, a swing arm, and a telescopic rod. The bottom end of the vertical pole is fixedly connected to the magnetic base, and the top end of the vertical pole is hinged to one end of the swing arm. The other end of the swing arm is provided with a fixing clip for clamping the displacement meter body, and the displacement meter body is connected to the fixing clip. The telescopic rod has a first hinge seat and a second hinge seat hinged at both ends. The first hinge seat is slidably sleeved on the vertical pole, and the second hinge seat is slidably sleeved on the swing arm. The telescopic rod includes a sleeve rod and an inner rod, and the inner rod and the sleeve rod are slidably sleeved relative to each other. The telescopic rod is equipped with a resistance adjustment component, which provides a preset resistance to limit the relative sliding between the inner rod and the sleeve rod to maintain the stability of the support, and allows the inner rod and the sleeve rod to slide relative to each other when the displacement gauge body reaches the range.

2. The overload protection displacement gauge bracket for steel support experiments according to claim 1, characterized in that: The resistance adjustment component includes a rubber sleeve that is fitted onto the surface of the inner rod, and the rubber sleeve is interference-fitted with the surface of the inner rod to provide the preset resistance.

3. The overload protection displacement gauge bracket for steel support experiments according to claim 1, characterized in that: The resistance adjustment assembly includes a movable sleeve, a mounting base, a fastening screw, a sliding block, and a friction block. The movable sleeve is sleeved on the outside of the sleeve rod, the mounting base is fixed to the side of the movable sleeve, and the fastening screw is threadedly connected to the mounting base. A side groove is formed on the side of the movable sleeve, the sliding block is slidably disposed in the side groove, and the friction block is fixed on the side of the sliding block facing the inner rod and presses against the surface of the inner rod. The end of the fastening screw presses against the side of the sliding block away from the inner rod, so as to change the pressing force between the friction block and the inner rod by adjusting the screw's tightening depth, thereby adjusting the preset resistance.

4. The overload protection displacement gauge bracket for steel support experiments according to claim 1, characterized in that: The resistance adjustment assembly includes a stainless steel ring, a fixed ring seat, and a permanent magnet; the stainless steel ring is embedded in the surface of the inner rod, the fixed ring seat is fixed to the top of the sleeve rod, and the permanent magnet is ring-shaped and disposed inside the fixed ring seat; the attraction force between the permanent magnet and the stainless steel ring constitutes the preset resistance, and when the inner rod and the sleeve rod slide relative to each other, the stainless steel ring can move with the inner rod and leave the attraction range of the permanent magnet.

5. The overload protection displacement gauge bracket for steel support experiments according to claim 1, characterized in that: It also includes an angle sensor and a sensor mounting bracket; the sensor mounting bracket is fixed to the top of the pole, the angle sensor is fixed to the side of the sensor mounting bracket, and the detection axis of the angle sensor is coaxial with the hinge axis of the pole and the swing arm and connected to the swing arm, for detecting the rotation angle of the swing arm relative to the pole.

6. The overload protection displacement gauge bracket for steel support experiments according to claim 1, characterized in that: Both the first hinge seat and the second hinge seat include a clamping ring and a locking bolt. The clamping ring is detachably fitted onto the upright or the swing arm, and the locking bolt passes through the open and closed end of the clamping ring to adjust the clamping force between the clamping ring and the upright or the swing arm by tightening or loosening.

7. The overload protection displacement gauge bracket for steel support experiments according to claim 2, characterized in that: The rubber sleeve is made of nitrile rubber or silicone.

8. The overload protection displacement gauge bracket for steel support experiments according to claim 3, characterized in that: The friction block is made of polytetrafluoroethylene or rubber, and the surface of the friction block that contacts the inner rod is provided with anti-slip texture.

9. The overload protection displacement gauge bracket for steel support experiments according to claim 4, characterized in that: The permanent magnet has an S pole on the inside and an N pole on the outside.

10. The overload protection displacement gauge bracket for steel support experiments according to claim 1, characterized in that: The bottom end of the pole is fixed to the magnetic base by thread or welding, and the bottom surface of the magnetic base is provided with an anti-slip pad.

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