Dual-mode multi-channel force measuring device capable of calibrating pressure sensors and its applications

Abstract

The present invention belongs to a force measuring device, in particular to a dual-mode multi-channel force measuring device capable of calibrating a pressure sensor and its application. It includes a basin-shaped cavity, a rubber elastic body disposed in the inner cavity of the basin-shaped cavity and whose outer edge is in contact with the side wall of the inner cavity of the basin-shaped cavity, and a lining plate covering the upper part of the rubber elastic body; a first channel is provided on the side wall, bottom or lining plate of the basin-shaped cavity, and both ends of the first channel are respectively opened to the outside and the outer surface of the rubber elastic body in the basin-shaped cavity. A pressure sensor is assembled in the first channel and its force measuring end is in contact with the surface of the rubber elastic body. A second channel is provided on the side wall or lining plate of the basin-shaped cavity, and both ends of the second channel are respectively opened to the outside and the outer surface of the rubber elastic body in the basin-shaped cavity. The present invention effectively solves the problems in the prior art such as the inability to replace the sensor and calibrate the force measuring data, and has the advantages of facilitating the replacement of the sensor and the calibration of the force measuring data, and accurate force measuring results.

Description

Technical Field

[0001] The present invention belongs to a force measuring device, in particular to a dual-mode multi-channel force measuring device capable of calibrating a pressure sensor and its application. Background Art

[0002] At present, in the public railway bridge and building design codes, due to the lack of effective testing means, some loads and their distributions are calculated based on certain assumptions, and there is a certain error between the calculation results and the actual situation. An excessive error may lead to unsafe use of the structure or waste due to an overly large safety factor. Therefore, measuring the structural load actually is the premise of safety and economy. Especially in recent years, bridge and building structure collapse accidents have occurred frequently, causing huge losses to people's lives and property and having a bad social impact on society. The reason is that the structural load and its distribution have changed and accumulated to a certain extent, exceeding the bearing capacity of the structural design. Therefore, measuring the force on the superstructure of a bridge or building structure, monitoring the stress states at each construction and operation stage, and being able to make judgments or give warnings when there is eccentric load or overloading are of great significance to the safety and design economy of the bridge or building structure.

[0003] A bearing or other supporting device is a key component connecting the upper and lower structures of a bridge or building. The forces on the bridge or building can all be reliably reflected through the bearing or supporting device. Therefore, it is feasible in practice to monitor the stress of the bridge structure by adding a force measuring function to the bearing or supporting device.

[0004] At present, some bearing devices (such as bridge bearings, building bearings, bridge rotation ball hinges, etc.) of bridges and buildings in China also have relevant technical designs with force measuring functions. The above technical designs generally adopt the method of implanting a force measuring sensor to achieve. These force measuring methods must calibrate the force measuring data through relevant tests before use. Some large-tonnage force measuring supporting devices are often unable to calibrate the data full scale due to the limitation of the measurement range of the test equipment. And because the sensor is a precision part, it is inevitable that factors such as bumping and vibration will interfere with the force measuring element during transportation and installation, thus affecting the calibrated structure. In addition, the general service life of pressure sensors is relatively low, and the service life to maintain a certain accuracy cannot be reliably guaranteed. And when the sensor needs to be replaced, most existing force measuring supporting devices cannot guarantee the replaceable function, and some devices with replaceable functions also cannot provide the function of calibrating the force measuring data on site.

[0005] Therefore, ensuring that the bearing devices (such as bridge bearings, building bearings, bridge rotation ball hinges, etc.) for bridge or building structures have force measuring functions, the force measuring elements can be replaced and the force measuring data can be calibrated on site is not only an actual need in engineering, but also an important research direction for those skilled in the art.

[0006] The applicant has not found any patent literature reports related to this application in the domestic patent database. Summary of the Invention

[0007] The purpose of the present invention is to provide a dual-mode multi-channel force measuring device capable of calibrating a pressure sensor and its application, which can effectively utilize the isotropy of the rubber elastomer under pressure to measure its force and can calibrate the pressure sensor as needed.

[0008] The overall technical concept of the present invention is:

[0009] A dual-mode multi-channel force measuring device capable of calibrating a pressure sensor, including a basin-shaped cavity, a rubber elastomer disposed in the inner cavity of the basin-shaped cavity and having its outer edge fitting with the side wall of the inner cavity of the basin-shaped cavity, and a lining plate covering the upper part of the rubber elastomer; a first hole is provided on the side wall, bottom or lining plate of the basin-shaped cavity, and both ends of the first hole are respectively opened to the outside and the outer surface of the rubber elastomer in the basin-shaped cavity. The pressure sensor is assembled in the first hole and its force measuring end fits with the surface of the rubber elastomer. A second hole is provided on the side wall, bottom or lining plate of the basin-shaped cavity, and both ends of the second hole are respectively opened to the outside and the outer surface of the rubber elastomer in the basin-shaped cavity.

[0010] Application of the dual-mode multi-channel force measuring device capable of calibrating a pressure sensor in the calibration of a pressure sensor.

[0011] The specific technical concept of the present invention also includes:

[0012] For the convenience of assembling and disassembling the pressure sensor, a preferred technical implementation means is that the pressure sensor is assembled in the first hole by a detachable connection.

[0013] For the convenience of assembling the pressure sensor, a preferred technical implementation means is that the pressure sensor is assembled in the first hole through a threaded interface or a quick connection interface provided in the first hole.

[0014] To avoid damage caused by excessive expansion of the rubber elastomer into the second hole due to the too large aperture of the second hole, a preferred technical implementation method is that the second hole is a hole with a diameter that gradually decreases from the outside to the inside.

[0015] Since the rubber elastomer can be regarded as an approximate fluid, when the rubber elastomer is subjected to an instantaneous load or deformed due to structural deformation, the readings of each sensor may be inconsistent for a period of time, but the readings of each sensor are the same after stabilization. The preferred technical implementation method is that, according to the different force measurement requirements of the device, the first channel is one or at least two spaced and not connected to each other. For operating conditions with a low force measurement frequency, based on the isotropy of force transmission of the rubber elastomer under a stable force state, the force values measured by the pressure sensor are equal within the allowable error. In this case, one first channel is set and the value of one sensor is read; for operating conditions with a high force measurement frequency, such as real-time force measurement, at least two first channels are symmetrically set, and the values of all sensors need to be read and the average value is taken.

[0016] In order to ensure the force consistency of the pressure sensor, the preferred technical implementation means is that the first channels are evenly distributed at equal angles on the side wall, bottom or lining plate of the basin-shaped cavity.

[0017] In order to achieve rapid assembly of the liquid working medium injection device and the second channel, a preferred technical implementation means is that the outer end opening of the second channel is provided with an interface adapted to the liquid working medium injection device.

[0018] The applicant needs to explain that the liquid working medium in the present invention refers to a liquid working medium that is easily injected into the second channel through a liquid working medium injection device. Silicone oil or hydraulic oil is preferably used due to the working state and stable chemical properties.

[0019] The working principle of the present invention is:

[0020] When a rubber elastic body in a sealed state is under pressure, it is similar to a fluid and the force it receives isotropically. Therefore, by measuring the pressure of the rubber elastic body in this state, the force on the device can be calculated using the known pressure-bearing area.

[0021] Its application in pressure sensor calibration includes the following steps:

[0022] A. When the force measurement data needs to be recalibrated, the pressure sensor is installed in the first channel, with the force measuring end of the pressure sensor in contact with the surface of the rubber elastic body; a liquid working fluid injection device connected to a pressure gauge is connected to the outer end opening of the second channel;

[0023] B. injecting the liquid working medium into the second channel through the liquid working medium injection device;

[0024] C. The rubber elastic body is deformed at the outlet of the inner end of the second channel due to pressure, and the hydraulic fluid is blocked in the second channel;

[0025] D. Increase the input pressure of the liquid working medium until it overcomes the deformation generated by the rubber elastomer at the outlet of the inner end of the second channel. The liquid working medium enters the basin-shaped cavity from the outlet of the inner end of the second channel. Since the pressure of the liquid working medium remains relatively stable after decreasing and is displayed on the pressure gauge;

[0026] E. Read the data of the pressure gauge to calibrate the data read by the pressure sensor.

[0027] The applicant needs to explain that:

[0028] In the description of the present invention, the orientation or positional relationship indicated by terms such as "outer edge", "side wall", "upper part", "bottom", "two ends", "outside", "outer surface", "outer end", "inner end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. The terms "first" and "second" are only used to indicate differences and cannot be understood as implying importance.

[0029] The substantial features and remarkable technical progress possessed by the present invention are as follows:

[0030] 1. The device of the present invention adopts two sets of force measurement systems. One is a conventional system that intelligently obtains the magnitude of the external load by setting a force measurement sensor to measure the pressure of the rubber elastomer; the other is a system that injects liquid working medium into the liquid channel on-site. Based on the principle that the liquid pressure after stabilization is equal to the pressure borne by the rubber elastomer, the force value is obtained by measuring the liquid pressure.

[0031] 2. Technical measures such as the second channel, the liquid working medium injection device, the liquid working medium, and the pressure gauge are used to calibrate the on-site data of the force measurement system mainly composed of the pressure sensor. It can effectively ensure the accuracy of the force measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of the present invention in which the first channel is located on the liner and the second channel is located in the middle of the side wall of the basin-shaped cavity.

[0033] Figure 2 It is a schematic structural diagram of the present invention in which the first channel is located on the liner and the second channel is located in the lower part of the side wall of the basin-shaped cavity.

[0034] Figure 3 It is a schematic structural diagram of the present invention in which both the first channel and the second channel are located on the liner.

[0035] Figure 4 It is a schematic structural diagram of the present invention in which the first channel and the second channel are longitudinally spaced apart on the side wall of the basin-shaped cavity.

[0036] Figure 5 It is a schematic structural diagram of the present invention in which the first channel and the second channel are horizontally spaced on the side wall of the basin-shaped cavity.

[0037] Figure 5A It is Figure 5 The B-B view of.

[0038] Figure 6 It is a schematic structural diagram of the present invention in which the first channel is located on the side wall of the basin-shaped cavity and the second channel is located on the lining plate.

[0039] Figure 7 It is a schematic structural diagram of the present invention in which the first channel is located at the bottom of the basin-shaped cavity and the second channel is located in the middle of the side wall of the basin-shaped cavity.

[0040] Figure 8 It is a schematic structural diagram of the present invention in which the first channel is located at the bottom of the basin-shaped cavity and the second channel is located in the lower part of the side wall of the basin-shaped cavity.

[0041] Figure 9 It is a schematic structural diagram of the present invention in which the first channel is located at the bottom of the basin-shaped cavity and the second channel is located on the lining plate.

[0042] Figure 10 It is Figure 7 The partial enlarged view of A in (the rubber elastomer is in a compressed state).

[0043] Figure 11 It is Figure 7 The partial enlarged view of A in (the rubber elastomer is in an uncompressed state).

[0044] The reference numerals in the drawings are as follows:

[0045] 1. Basin-shaped cavity; 2. Lining plate; 3. Rubber elastomer; 4. Pressure sensor; 5. First channel; 6. Second channel. Specific embodiments

[0046] The following further describes the present invention with reference to embodiments, but it should not be construed as a limitation of the present invention. The protection scope of the present invention is subject to the content recorded in the claims, and any equivalent technical means substitution made according to the description of the specification does not depart from the protection scope of the present invention.

[0047] Embodiment 1

[0048] The overall structure of this embodiment is as Figure 1As shown in the figure, it includes a pot - type cavity 1, a rubber elastomer 3 disposed in the inner cavity of the pot - type cavity 1 and whose outer edge is in contact with the inner - side wall of the pot - type cavity 1, and a lining plate 2 covering the upper part of the rubber elastomer 3. A first pore 5 is located on the lining plate, and a second pore 6 is located in the middle of the side wall of the pot - type cavity. Both ends of the first pore 5 are respectively open to the outside and the outer surface of the rubber elastomer 3 inside the pot - type cavity 1. A pressure sensor 4 is assembled in the first pore 5 and its force - measuring end is in contact with the surface of the rubber elastomer 3. Both ends of the second pore 6 are respectively open to the outside and the outer surface of the rubber elastomer 3 inside the pot - type cavity 1.

[0049] The pressure sensor 4 is assembled in the first pore 5 through a threaded interface or a quick - connection interface opened on the first pore 5.

[0050] The second pore 6 is a pore with a diameter that gradually decreases from the outside to the inside.

[0051] There are two first pores 5 that are spaced apart and non - communicating. The first pores 5 are evenly distributed at equal angles on the lining plate 2. There are two second pores 6, which are evenly distributed at equal angles in the middle of the side wall of the pot - type cavity 1.

[0052] An interface adapted to a liquid - working - medium injection device is provided at the outer - end opening of the second pore 6.

[0053] Embodiment 2

[0054] The difference between this embodiment and Embodiment 1 is that:

[0055] The overall structure of this embodiment is as Figure 2 As shown in the figure, there are two first pores 5 located on the lining plate, and the second pore 6 is located at the lower part of the side wall of the pot - type cavity. The first pores 5 are evenly distributed at equal angles on the lining plate 2. There are two second pores 6, which are evenly distributed at equal angles at the lower part of the side wall of the pot - type cavity 1.

[0056] The rest of the content is the same as that of Embodiment 1.

[0057] Embodiment 3

[0058] The difference between this embodiment and Embodiment 1 is that:

[0059] The overall structure of this embodiment is as Figure 3 As shown in the figure, both the first pore 5 and the second pore 6 are two and are located on the lining plate. The first pore 5 and the second pore 6 are evenly distributed at equal angles on the lining plate 2.

[0060] The rest of the content is the same as that of Embodiment 1.

[0061] Embodiment 4

[0062] The difference between this embodiment and Embodiment 1 is that:

[0063] The overall structure of this embodiment is as Figure 4As shown, there are two first channels 5 and two second channels 6, which are longitudinally spaced and arranged in the middle of the side wall of the basin-shaped cavity 1. The first channels 5 and the second channels 6 are evenly distributed at equal angles in the middle of the side wall of the basin-shaped cavity 1.

[0064] The rest is the same as that of Embodiment 1.

[0065] Embodiment 5

[0066] The difference between this embodiment and Embodiment 1 is that:

[0067] The overall structure of this embodiment is as shown in Figure 5 、 Figure 5A As shown, there are two first channels 5 and two second channels 6, which are horizontally spaced and arranged in the middle of the side wall of the basin-shaped cavity 1. The first channels 5 and the second channels 6 are evenly distributed at equal angles in the middle of the side wall of the basin-shaped cavity 1.

[0068] The rest is the same as that of Embodiment 1.

[0069] Embodiment 6

[0070] The difference between this embodiment and Embodiment 1 is that:

[0071] The overall structure of this embodiment is as shown in Figure 6 As shown, there are two first channels 5, which are evenly distributed at equal angles in the middle of the side wall of the basin-shaped cavity 1, and there are two second channels 6, which are evenly distributed at equal angles on the lining plate 2.

[0072] The rest is the same as that of Embodiment 1.

[0073] Embodiment 7

[0074] The difference between this embodiment and Embodiment 1 is that:

[0075] The overall structure of this embodiment is as shown in Figure 7 As shown, there are two first channels 5, which are evenly distributed at equal angles at the bottom of the side wall of the basin-shaped cavity 1, and there are two second channels 6, which are evenly distributed at equal angles in the middle of the side wall of the basin-shaped cavity 1.

[0076] The rest is the same as that of Embodiment 1.

[0077] Embodiment 8

[0078] The difference between this embodiment and Embodiment 1 is that:

[0079] The overall structure of this embodiment is as shown in Figure 8 As shown, there are two first channels 5, which are evenly distributed at equal angles at the bottom of the side wall of the basin-shaped cavity 1, and there are two second channels 6, which are evenly distributed at equal angles in the lower part of the side wall of the basin-shaped cavity 1.

[0080] The rest is the same as that of Embodiment 1.

[0081] Embodiment 9

[0082] The difference between this embodiment and Embodiment 1 is that:

[0083] The overall structure of this embodiment is as Figure 9 shown. There are two first channels 5, which are evenly distributed at equal angles at the bottom of the side wall of the basin-shaped cavity 1. There are two second channels 6, which are evenly distributed at equal angles on the lining plate 2.

[0084] The remaining content is the same as that of Embodiment 1.

[0085] To verify the technical effects of the present invention, the applicant conducted the following experiments:

[0086]

[0087]

[0088] From the above experimental results, it can be seen that the pressure of the liquid working medium gradually increases by continuously injecting the liquid working medium until the pressure exceeds the pressure of the rubber elastomer at the channel 6, causing the liquid working medium to leak into the cavity where the rubber elastomer is located. Thus, the pressure starts to decrease and drops to a relatively stable pressure range. After stabilization, it means that the pressure of the liquid is the same as that of the rubber elastomer in the pelvic cavity. Therefore, the force-bearing situation of the support can be deduced.

Claims

1. A dual-mode multi-channel force measuring device capable of calibrating a pressure sensor, comprising a basin-shaped cavity (1), a rubber elastic body (3) disposed in the inner cavity of the basin-shaped cavity (1) and having its outer edge bonded to the inner cavity side wall of the basin-shaped cavity (1), and a lining plate (2) bonded to and covering the upper portion of the rubber elastic body (3); characterized in that A first channel (5) is provided on the side wall, bottom or lining plate (2) of the basin-shaped cavity (1), and the two ends of the first channel (5) are respectively opened to the outside and the outer surface of the rubber elastic body (3) in the basin-shaped cavity (1). A pressure sensor (4) is assembled in the first channel (5) and its force measuring end is in contact with the surface of the rubber elastic body (3). A second channel (6) is provided on the side wall or bottom or lining plate (2) of the basin-shaped cavity (1), and the two ends of the second channel (6) are respectively opened to the outside and the outer surface of the rubber elastic body (3) in the basin-shaped cavity (1). The outer end opening of the second channel (6) is provided with an interface adapted to a liquid working medium injection device connected to a pressure gauge. The second channel (6) is a channel that contracts in diameter from the outside to the inside.

2. The dual-mode multi-channel force measuring device capable of calibrating a pressure sensor according to claim 1, characterized in that The pressure sensor (4) is assembled in the first channel (5) by a detachable connection.

3. The dual-mode multi-channel force measuring device capable of calibrating a pressure sensor according to claim 1 or 2, characterized in that The pressure sensor (4) is assembled in the first hole (5) via a threaded interface or a quick-connect interface provided in the first hole (5).

4. The dual-mode multi-channel force measuring device capable of calibrating a pressure sensor according to claim 1, characterized in that The first channel (5) is one or at least two first channels that are spaced apart and not connected to each other.

5. The dual-mode multi-channel force measuring device capable of calibrating a pressure sensor according to claim 4, characterized in that The first holes (5) are evenly distributed at equal angles on the side wall, bottom or lining plate (2) of the basin-shaped cavity (1).

6. Application of the dual-mode multi-channel force measuring device capable of calibrating a pressure sensor according to any one of claims 1 to 5 in pressure sensor calibration, characterized in that The steps include: A. When the force measurement data needs to be recalibrated, the pressure sensor (4) is installed in the first channel (5), and the force measuring end of the pressure sensor (4) is in contact with the surface of the rubber elastic body (3); a liquid working medium injection device connected to a pressure gauge is connected to the outer end opening of the second channel (6); B. injecting liquid working medium into the second channel (6) through the liquid working medium injection device; C. The rubber elastic body (3) is compressed and deformed at the inner end outlet of the second channel (6), and the hydraulic fluid is blocked in the second channel (6); D. Increase the input pressure of the liquid working medium until it overcomes the deformation of the rubber elastic body (3) at the inner end outlet of the second hole (6), and the liquid working medium enters the basin-shaped cavity from the inner end outlet of the second hole (6). After the pressure of the liquid working medium decreases, it remains in a relatively stable state and is displayed on the pressure gauge; E. Read the data of the pressure gauge and calibrate the data read by the pressure sensor (4).

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