CN220690058U - Three-dimensional displacement monitoring device of integrated structure high-precision shock insulation support - Google Patents

Abstract

The utility model relates to the technical field of vibration isolation support displacement monitoring, in particular to a high-precision vibration isolation support three-dimensional displacement monitoring device with an integrated structure. Including the base, fixed mounting has first angle sensor on the base, first angle sensor's measuring stick top is through first transmission coupling mechanism fixedly connected with first U type seat, rotates through the pivot in the first U type seat and is connected with the mount pad, the top fixedly connected with linear displacement sensor of mount pad, one side fixedly connected with second U type seat of first U type seat, fixed mounting has second angle sensor in the side support board of first U type seat one end is kept away from to the second U type seat, second angle sensor's measuring stick passes through second transmission coupling mechanism and linear displacement sensor's lateral wall fixed connection. The three-dimensional displacement of the shock insulation support can be measured simultaneously through the device, so that friction errors and multi-axis accumulated errors generated by adopting three displacement measuring devices to install the sliding groove mechanism are reduced, and the measurement accuracy is improved.

Description

Integrated structure high-precision isolation bearing three-dimensional displacement monitoring device

Technical field

The utility model relates to the technical field of isolation bearing displacement monitoring, and specifically relates to an integrated structure high-precision three-dimensional displacement monitoring device for an earthquake isolation bearing.

Background technique

As a key component in the seismic isolation structural system, the performance and health of the seismic isolation bearing are crucial to the seismic resistance and safety performance of the building. During construction and use, due to the complex self- and environmental load effects, isolation bearings will inevitably accumulate damage to the structural system. If it is not diagnosed and repaired in time, the earthquake resistance of the bearing will be reduced, further increasing the risk of casualties and economic losses caused by earthquakes. Therefore, the health status of isolation bearings in complex and changeable environments has become the focus of many researchers.

At present, the commonly used detection method of seismic isolation bearings is to disassemble the isolation bearings to be inspected and evaluate their safety status based on visual inspection. This evaluation method is costly and time-consuming, and it cannot accurately and real-time monitor the bearings. Condition of use in the building. With the rapid development of sensor technology, wireless communication and other technologies, the isolation bearing displacement monitoring system has been widely used in some engineering fields to monitor the displacement of the isolation bearing and evaluate the health status of the isolation bearing.

In the prior art, three intelligent flexible displacement meters are usually installed on the seismic isolation bearing to monitor the deformation of the seismic isolation bearing in the X, Y and Z directions. The Chinese utility model patent with publication number CN212153728U discloses a building seismic isolation bearing monitoring device, which realizes three-directional displacement monitoring by respectively installing detection modules based on displacement sensors in the X, Y and Z directions on the seismic isolation bearing; the Chinese utility model patent with publication number CN209295936U discloses a rubber bearing capable of detecting displacement and its displacement measurement system, which realizes lateral and vertical displacement measurement by using a sliding assembly and a displacement detection device; the Chinese utility model patent with publication number CN216717254U discloses a three-dimensional displacement measurement device, which measures the three-dimensional relative displacement between the two connecting plates of the seismic isolation bearing by installing a displacement measurement module and a gyroscope module.

Although the above-mentioned isolation support displacement monitoring device does not require manual labor and can detect the isolation support displacement in real time, it still has some limitations, mainly reflected in:

1. The deformation of the isolation bearing is a composite motion, including displacement in the three directions of Cumulative errors lead to a decrease in overall measurement accuracy; 2. The combined use of multiple displacement measurement devices and the arrangement of a large number of signal transmission lines and mounting brackets will increase the cost of the measurement device; 3. The measurement of the gyroscope is based on the integral of the rotation speed. When measuring the static angle At this time, due to factors such as the bias drift and noise of the gyroscope, even if there is no rotation of the object, the gyroscope will still output a certain angular velocity signal. During long-term monitoring, the gyroscope measurement error will gradually accumulate during the integration process, resulting in Angle measurement accuracy decreases.

Therefore, there is an urgent need to provide an integrated structure high-precision three-dimensional displacement monitoring device for isolation supports to solve the problems existing in the existing technology.

Utility model content

In view of the problems existing in the above-mentioned prior art, the present utility model provides an integrated structure high-precision three-dimensional displacement monitoring device for isolation supports, and specifically discloses the following technical solutions:

An integrated structure high-precision three-dimensional displacement monitoring device for an isolation support, characterized in that it includes a base, a first angle sensor is fixedly installed on the base, and the measuring rod of the first angle sensor is arranged vertically upward, The top of the measuring rod of the first angle sensor is fixedly connected to a first U-shaped seat through a first transmission connection mechanism. A mounting base is rotatably connected to the first U-shaped seat through a rotating shaft. The top of the mounting seat is fixedly connected to a Linear displacement sensor, one side of the first U-shaped seat is fixedly connected with a second U-shaped seat through screws, and a second mounting plate is provided through the side support plate at one end of the second U-shaped seat away from the first U-shaped seat. hole, a second angle sensor is fixedly installed in the second installation hole, the measuring rod of the second angle sensor is located inside the second U-shaped seat, and is fixedly connected to the side wall of the linear displacement sensor through the second transmission connection mechanism. , the measuring rod of the second angle sensor and the axis of the rotating shaft are located on the same straight line.

Further, the base includes two L-shaped support plates spaced apart from each other and arranged symmetrically. An upper support plate and a lower support plate are connected between the two L-shaped support plates. The upper support plate and the lower support plate are arranged in parallel. The upper support plate is provided with a working hole, the lower support plate is provided with a first installation hole, and the first angle sensor is fixedly installed in the first installation hole of the lower support plate. A bearing seat is fixedly installed at the top of the bearing corresponding to the position of the working hole. A bearing is installed in the bearing seat. The top of the first transmission connection mechanism passes through the working hole and the bearing in the bearing seat and the bottom of the first U-shaped seat in sequence. Wall fixed connection.

Further, the first transmission connection mechanism includes a first coupling and a connecting cylinder, the top end of the measuring rod of the first angle sensor is connected to the connecting cylinder through the first coupling, and the measurement of the first angle sensor The rod, the first coupling and the connecting cylinder are all located on the same straight line. The connecting cylinder passes through the working hole and the bearing in the bearing seat in sequence. The top surface of the connecting cylinder is provided with a first threaded hole. A second threaded hole is provided through the bottom plate of the first U-shaped seat, and the bottom plate of the first U-shaped seat is fixedly connected to the top of the connecting cylinder through screws.

Further, the bearing seat adopts a prismatic bearing seat, and the prismatic bearing seat is fixed on the upper support plate through screws.

Further, the second transmission connection structure includes a second coupling and a connecting rod. One end of the second coupling is fixedly connected to the measuring rod of the second angle sensor, and the other end of the second coupling Vertically connected to the connecting rod, an end of the connecting rod away from the second coupling is provided with a fixed seat, and the fixed seat is fixedly connected to the side wall of the linear displacement sensor through screws.

Furthermore, threaded holes are provided at the top end of the mounting seat and the bottom end of the linear displacement sensor, and the mounting seat and the linear displacement sensor are fixedly connected by screws.

Further, both the first angle sensor and the second angle sensor adopt encoder-type rotation angle sensors.

Compared with the existing technology, the beneficial effects of this utility model are:

The three-dimensional displacement of the seismic isolation support can be measured through an integrated displacement monitoring device, thereby reducing the friction error and multi-axis cumulative error caused by using three displacement measuring devices to install the chute mechanism, improving measurement accuracy, and effectively reducing the cost.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

Figure 2 is a schematic diagram of the structure of the present utility model except for the linear displacement sensor.

Figure 3 is a front view of the structure of the present utility model except for the linear displacement sensor.

FIG. 4 is a schematic diagram of a partial structural decomposition of the present invention.

FIG. 5 is a schematic diagram of a partial structural decomposition of the present invention.

Figure 6 is a schematic diagram of the implementation of the present utility model.

Figure 7 is a schematic diagram of the sensor data vector decomposition in the initial state of the present invention.

FIG8 is a schematic diagram of sensor data vector decomposition in the working state of the present invention.

1-base, 2-first angle sensor, 3-first U-shaped seat, 4-mounting seat, 5-linear displacement sensor, 6-second U-shaped seat, 7-second angle sensor, 8-bearing seat, 9-threaded part, 10-nut, 11-first coupling, 12-connecting cylinder, 13-second coupling, 14-connecting rod, 15-upper connecting plate, 16-lower connecting plate.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all implementations. example. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

Referring to Figures 1-6, an integrated structure high-precision seismic isolation bearing three-dimensional displacement monitoring device is characterized in that it includes a base 1, on which a first angle sensor 2 is fixedly installed, the measuring rod of the first angle sensor 2 is arranged vertically upward, the top end of the measuring rod of the first angle sensor 2 is fixedly connected to a first U-shaped seat 3 through a first transmission connection mechanism, the first U-shaped seat 3 is rotatably connected with a mounting seat 4 through a rotating shaft, the top end of the mounting seat 4 is fixedly connected to a linear displacement sensor 5, one side of the first U-shaped seat 3 is fixedly connected to a second U-shaped seat 6 by screws, the second U-shaped seat 6 is penetrated by a second mounting hole on the side support plate away from one end of the first U-shaped seat 3, the second angle sensor 7 is fixedly installed in the second mounting hole, the measuring rod of the second angle sensor 7 is located on the inner side of the second U-shaped seat 6, and is fixedly connected to the side wall of the linear displacement sensor 5 through a second transmission connection mechanism, and the measuring rod of the second angle sensor 7 and the axis of the rotating shaft are both located on the same straight line.

In this embodiment, the base 1 includes two L-shaped support plates spaced apart from each other and arranged symmetrically. An upper support plate and a lower support plate are connected between the two L-shaped support plates. The upper support plate and the lower support plate Arranged in parallel, the upper support plate is provided with a working hole, the lower support plate is provided with a first installation hole, and the first angle sensor 2 is fixedly installed in the first installation hole of the lower support plate, so The top end of the above-mentioned support plate is fixedly installed with a bearing seat 8 corresponding to the position of the working hole. A bearing is installed in the bearing seat 8. The top end of the first transmission connection mechanism passes through the working hole and the bearing in the bearing seat 8 in turn. The bottom wall of the first U-shaped seat 3 is fixedly connected.

In this embodiment, both the first angle sensor 2 and the second angle sensor 7 are provided with a threaded portion 9 . The first angle sensor 2 is fixed in the first mounting hole by a nut, and the second angle sensor 7 is fixed in the second mounting hole by a nut 10 .

In this embodiment, the first transmission connection mechanism includes a first coupling 11 and a connecting cylinder 12. The top end of the measuring rod of the first angle sensor 2 is connected to the connecting cylinder 12 through the first coupling 11, and the The measuring rod of the first angle sensor 2, the first coupling 11 and the connecting cylinder 12 are all located on the same straight line. The connecting cylinder 12 passes through the working hole and the bearing in the bearing seat 8 in sequence. The top surface of the connecting cylinder 12 is provided with a first threaded hole, and the bottom plate of the first U-shaped seat 3 is provided with a second threaded hole. The bottom plate of the first U-shaped seat 3 is connected to the top of the connecting cylinder 12 through screws. Fixed connection. The arrangement of the bearing seat 8 and the bearings can not only reduce friction, but also limit the position of the connecting cylinder 12, thereby ensuring the stability of its rotation. When the linear displacement sensor 5 rotates in the horizontal direction, it drives the first U-shaped base 3 and the mounting base 4 to rotate as a whole, thereby driving the connecting cylinder 12 to rotate, and the connecting cylinder 12 drives the first coupling 11 to rotate, which in turn drives the first angle sensor. When the measuring rod 2 rotates, the first angle sensor 2 can measure the rotation angle of the linear displacement sensor 5 .

In this embodiment, the bearing seat 8 is a prismatic bearing seat, and the prismatic bearing seat is fixed to the upper support plate by screws.

In this embodiment, the second transmission connection structure includes a second coupling 13 and a connecting rod 14. One end of the second coupling 13 is fixedly connected to the measuring rod of the second angle sensor 7. The second The other end of the coupling 13 is vertically connected to the connecting rod 14. An end of the connecting rod 14 away from the second coupling 13 is provided with a fixed seat. The fixed seat is fixedly connected to the side wall of the linear displacement sensor 5 through screws. When the linear displacement sensor 5 produces an angle change in the vertical direction, it drives the connecting rod 14 to rotate, and the connecting rod 14 transmits the elevation angle change to the measuring rod of the second angle sensor 7 through the second coupling 13, thereby passing the second angle sensor 7 Measure the elevation change of the linear displacement sensor 5.

In this embodiment, threaded holes are opened at the top of the mounting base 4 and the bottom of the linear displacement sensor 5. The mounting base 4 and the linear displacement sensor 5 are fixedly connected by screws, thereby facilitating disassembly and fixation.

In this embodiment, the first angle sensor 2 and the second angle sensor 7 are both encoder-type rotation angle sensors. Encoder-type rotation angle sensors have lower zero drift and noise and higher measurement accuracy.

The linear displacement sensor 5 in this embodiment uses a resistance strain displacement sensor based on an equal-strength cantilever beam structure. That is, the resistance strain gauge is pasted on the surface of the equal-strength cantilever beam, and the measurement guide rod of the linear displacement sensor 5 drives the equal-strength cantilever beam. When the free end deforms, the strain gauge will deform cooperatively with the cantilever beam of equal strength, and the resistance value of the strain gauge will change accordingly, which is converted into a voltage change through the bridge circuit.

The utility model also includes temperature compensation for the device, thereby further improving the measurement accuracy. The compensation methods are mainly as follows:

Hardware compensation: Use a method that combines temperature self-compensating strain gauges with a double-arm differential bridge to achieve hardware temperature compensation. The two strain gauges are pasted on the upper and lower surfaces of the same area of the cantilever beam, and they are in the same temperature field. , but the force state is opposite. When the cantilever beam deforms, the resistance of one strain gauge increases and the resistance of the other decreases. At this time, the resistance of the two strain gauges is affected by the temperature in the same way. Connect the strain gauges to the two adjacent two-arm differential bridges. In the bridge arm, the temperature influence on the strain gauge can be offset in the bridge, thus eliminating the influence of temperature error.

Software compensation: In order to further reduce the impact of temperature drift on the three-dimensional displacement monitoring device of the integrated structural high-precision isolation support, a high-precision temperature sensor is used to collect temperature information in real time, and a software linear temperature compensation model is constructed based on the least squares method.

A series of displacement measurements were collected using a displacement sensor at different temperatures. Make sure you have enough data points over the entire temperature range. When the sensor input displacement is and the real-time temperature is Tem, use the least squares method to fit the measured output U of the sensor. Then for the fitted output y of the displacement sensor, the fitting function is as follows:

y＝a×Tem+b

In the formula, a and b are fitting function coefficients, which will have different values for different displacements.

Then the compensated output of the temperature compensation model based on the least squares method is:

In the formula, U _reference is the sensor output when the temperature is the reference temperature, and U _measured is the actual output of the sensor.

In actual use, the device of the present invention is installed between the upper connecting plate 15 and the lower connecting plate 16 of the earthquake isolation support, and the base is fixed to the lower connecting plate through screws, and the top of the linear displacement sensor is connected to the upper connecting plate. When the plates collide, the rotation angle and elevation data are obtained in real time through the first angle sensor and the second angle sensor, and combined with the tensile displacement data of the linear displacement sensor, the three-dimensional displacement value of the isolation bearing can be obtained through vector decomposition calculation.

The vector decomposition principle of sensor data is:

Refer to Figures 7-8. Figure 7 shows the initial state of the three-dimensional displacement monitoring device of the integrated structure high-precision isolation support. Figure 8 shows the three-dimensional displacement monitoring device of the integrated structure high-precision isolation support following the movement of the connecting plate on the isolation support. Post-stretch and rotate state.

The initial position of the top of the measurement guide rod is A ₀ (x ₀ ,y ₀ ,z ₀ ), and the position after stretching and rotation is A _t (x _t ,y _t ,z _t ).

At the beginning, the displacement sensor initially detects the length L ₀ , combined with the initial elevation angle α ₀ collected by the second angle sensor and the initial rotation angle β 0 collected by the first angle sensor, the X-axis and Y-axis at the initial moment can be calculated through the trigonometric function formula The initial values of displacement of and Z-axis are respectively:

X ₀ =L ₀ cosα ₀ cosβ ₀

Y ₀ =L ₀ cosα ₀ sinβ ₀

Z ₀ =L ₀ sin α ₀

When the isolation support is deformed and displaced, the linear displacement sensor stretches and rotates simultaneously with the movement of the isolation support. Its stretching length is L _t , and the elevation angle and rotation angle become α _t and β _t respectively. It can be The calculated displacement values of the X-axis, Y-axis and Z-axis after stretching and rotation are:

X _t =L _t cosα _t cosβ _t

Y _t =L _t cosα _t sinβ _t

Z _t = L _t sin α _t

Finally, the three-dimensional displacement values of the isolation bearing can be obtained as follows: ΔX _t =L _t cosα _t cosβ _t -L ₀ cosα ₀ cosβ ₀

ΔY _t =L _t cosα _t sinβ _t -L ₀ cosα ₀ sinβ ₀

ΔZ _t =L _t sinα _t -L ₀ sinα ₀

Based on the above method, the tensile displacement, elevation angle and rotation angle are measured by the three-dimensional displacement monitoring device of the integrated structure high-precision isolation bearing. After vector decomposition calculation, the displacement values in the three directions of X, Y and Z can be obtained, thus Realize the three-dimensional displacement measurement of the isolation bearing.

The above are only preferred embodiments of the present utility model and do not limit the technical scope of the present utility model in any way. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model, All still belong to the scope of the technical solution of the present utility model.

Claims (7)

1. A three-dimensional displacement monitoring device for a high-precision seismic isolation bearing with an integrated structure, characterized in that it includes a base, wherein a first angle sensor is fixedly installed on the base, a measuring rod of the first angle sensor is arranged vertically upward, the top end of the measuring rod of the first angle sensor is fixedly connected to the first U-shaped seat through a first transmission connection mechanism, the first U-shaped seat is rotatably connected with a mounting seat through a rotating shaft, the top end of the mounting seat is fixedly connected to a linear displacement sensor, one side of the first U-shaped seat is fixedly connected to a second U-shaped seat by a screw, a second mounting hole is penetrated on a side support plate of the second U-shaped seat away from one end of the first U-shaped seat, the second angle sensor is fixedly installed in the second mounting hole, the measuring rod of the second angle sensor is located on the inner side of the second U-shaped seat, and is fixedly connected to the side wall of the linear displacement sensor through a second transmission connection mechanism, and the measuring rod of the second angle sensor and the axis center line of the rotating shaft are both located on the same straight line. 2. An integrated structure high-precision three-dimensional displacement monitoring device for an isolation support according to claim 1, characterized in that the base includes two mutually spaced and symmetrically arranged L-shaped support plates, two L-shaped support plates. An upper support plate and a lower support plate are connected between the support plates. The upper support plate and the lower support plate are arranged in parallel. The upper support plate is provided with a working hole, and the lower support plate is provided with a first mounting hole. hole, the first angle sensor is fixedly installed in the first installation hole of the lower support plate, the top of the upper support plate is fixedly installed with a bearing seat corresponding to the position of the working hole, and a bearing is installed in the bearing seat. The top end of the first transmission connection mechanism sequentially passes through the working hole and the bearing in the bearing seat and is fixedly connected to the bottom wall of the first U-shaped seat. 3. An integrated structure high-precision three-dimensional displacement monitoring device for isolation supports according to claim 2, characterized in that the first transmission connection mechanism includes a first coupling and a connecting cylinder, and the first The top end of the measuring rod of the angle sensor is connected to the connecting cylinder through the first coupling, and the measuring rod of the first angle sensor, the first coupling and the connecting cylinder are all located on the same straight line, and the connecting cylinder It passes through the working hole and the bearing in the bearing seat in turn. The top surface of the connecting cylinder is provided with a first threaded hole. The bottom plate of the first U-shaped seat is provided with a second threaded hole. The first U-shaped The bottom plate of the seat is fixedly connected to the top of the connecting cylinder through screws. 4. According to claim 2, an integrated structure high-precision seismic isolation support three-dimensional displacement monitoring device is characterized in that the bearing seat adopts a prismatic bearing seat, and the prismatic bearing seat is fixed to the upper support plate by screws. 5. An integrated structure high-precision three-dimensional displacement monitoring device for isolation supports according to claim 1, characterized in that the second transmission connection mechanism includes a second coupling and a connecting rod, and the second One end of the coupling is fixedly connected to the measuring rod of the second angle sensor, the other end of the second coupling is vertically connected to the connecting rod, and the end of the connecting rod away from the second coupling is provided with a fixed seat, so The fixed base is fixedly connected to the side wall of the linear displacement sensor through screws. 6. An integrated structure high-precision three-dimensional displacement monitoring device for an isolation support according to claim 1, characterized in that both the top of the mounting base and the bottom of the linear displacement sensor are provided with threaded holes. The mounting base and the linear displacement sensor are fixedly connected with screws. 7. An integrated structure high-precision three-dimensional displacement monitoring device for an isolation support according to claim 1, characterized in that both the first angle sensor and the second angle sensor adopt encoder-type rotation angle sensors.