Bridge weighing sensor

Abstract

The utility model discloses a bridge weighing sensor, which comprises a fixed base, a weighing sensor assembly and a bridge pile supporting leg, the top of the fixed base is provided with a first placing circular groove, the bottom of the first placing circular groove is provided with a second placing circular groove, the weighing sensor assembly is located in the second placing circular groove, and the bridge pile supporting leg is placed in the first placing circular groove; the weighing sensor assembly comprises a first stress ring, a second stress ring and a third stress ring which are concentric and consistent in thickness. Eight strain beams are arranged between the first stress ring and the second stress ring and between the second stress ring and the third stress ring in a circumferential array mode. A strain groove is formed in the side, close to the first stress circular ring, of the top of each strain beam. Shear strain gauges are attached to the side walls of the two sides of each strain beam. The utility model has the advantages that the three stress surfaces share stress, the thirty-two resistance strain gauges are uniformly distributed, the unbalance loading influence is reduced, the power is low, the sealing effect is good, and the protection grade is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge weighing sensor field, especially a kind of bridge weighing sensor. BACKGROUND

[0002] With the vigorous development of infrastructure in China, the construction of urban road traffic bridge is more and more perfect, and the structure health of bridge has also become one of the problems concerned by people.

[0003] As one of the tools for detecting the health of bridge structure, bridge weighing system was introduced in the 1970s. It can help bridge operators determine the cause of bridge-induced strain, and collect statistical data of vehicle weight, category, grade and frequency. The core weighing sensor of bridge weighing system plays a crucial role.

[0004] Most of the sensors for bridge weighing on the market are ordinary types of weighing sensors, which have poor adaptability to bridge structure. The long-term outdoor pressure and temperature have a great impact. When external factors such as twisting and earthquake occur, the signal is easy to deviate when the wire is out of position and moves, which even directly affects the service life of bridge pile leg. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a kind of bridge weighing sensor, with three stress surfaces to share stress, thirty-two resistance strain gauges are evenly distributed, reduce the influence of partial load, low power, good sealing effect, high protection level.

[0006] The above technical purpose of the utility model is realized by the following technical scheme:

[0007] A kind of bridge weighing sensor, comprising fixed base, weighing sensor assembly, bridge pile leg, the fixed base is square block, the first placement circular groove is set in the top of fixed base, the second placement circular groove is set in the bottom of first placement circular groove, the weighing sensor assembly is located in second placement circular groove, the bridge pile leg is placed in first placement circular groove;

[0008] The weighing sensor assembly includes first stress ring, second stress ring and third stress ring with the same center and consistent thickness, eight strain beams are arranged in circular array between the first stress ring and the second stress ring, and between the second stress ring and the third stress ring, the top and bottom of the eight strain beams between the first stress ring and the second stress ring are provided with a first cover plate in the form of a ring, and the top and bottom of the eight strain beams between the second stress ring and the third stress ring are provided with a second cover plate in the form of a ring.

[0009] Each strain beam is provided with a strain groove on the side close to the first stress ring on the top.

[0010] The side wall of each of the strain beams is attached with a shear strain gauge, and thirty-two of the shear strain gauges are connected in series to form a Wheatstone bridge.

[0011] The first stress ring and the second stress ring are filled with sealing silica gel.

[0012] Preferably, the thickness of the strain beams is three-fifths of the thickness of the first stress ring, and the strain beams are centrally arranged.

[0013] Preferably, the side wall of the second stress ring and the third stress ring is circumferentially provided with four wire passing holes, the four wire passing holes are respectively arranged between two strain beams, the top of the fixed base is provided with a wire passing groove, and the wire passing groove is communicated with the first placement circular groove and the second placement circular groove.

[0014] Preferably, the top and the bottom of each of the strain beams are provided with threaded holes, the top of each of the first cover plate and the second cover plate is provided with a plurality of circular through holes corresponding to the threaded holes, each of the circular through holes is provided with a countersunk screw, and each of the countersunk screws is threadedly connected with the corresponding threaded hole.

[0015] Preferably, the bridge pile leg is in a cylindrical shape, the lower end of the bridge pile leg is inserted into the first placement circular groove, the upper end and the lower end of the side wall of the bridge pile leg are circumferentially provided with four fixing plates, and the bridge pile leg is connected with the top flange of the fixed base through the four fixing plates at the lower end.

[0016] Preferably, the eight strain beams between the first stress ring and the second stress ring are provided with first rounded corners between the strain beams and the fixedly connected side walls.

[0017] The eight strain beams between the second stress ring and the third stress ring are provided with second rounded corners between the strain beams and the fixedly connected side walls.

[0018] The eight strain beams between the second stress ring and the third stress ring are provided with second rounded corners between the strain beams and the fixedly connected side walls.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1. The first stress ring, the second stress ring and the third stress ring can share stress, reduce the measurement error caused by bridge misplacement.

[0021] 2. The sixteen strain beams and the thirty-two shear strain gauges can greatly improve the measurement sensitivity of the sensor and improve the influence of the data caused by the eccentric load, thereby ensuring the accuracy of the sensor.

[0022] 3. By sealing the silica gel, the first cover plate and the second cover plate, the overall protection level of the weighing sensor assembly can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the overall structure of the embodiment;

[0024] Figure 2 is an exploded view of the schematic view of the overall structure of the embodiment;

[0025] Figure 3 is a bottom side view of the weighing sensor assembly of the embodiment;

[0026] Figure 4 is an exploded view of the weighing sensor assembly of the embodiment;

[0027] Figure 5 is a sectional view of the exploded view of the weighing sensor assembly of the embodiment.

[0028] In the drawings, 1 is a fixed base; 2 is a weighing sensor assembly; 3 is a bridge pile leg; 111 is a first placement circular groove; 112 is a second placement circular groove; 211 is a first force circular ring; 212 is a second force circular ring; 213 is a third force circular ring; 214 is a strain beam; 215 is a first cover plate; 216 is a second cover plate; 217 is a strain groove; 218 is a shear strain gauge; 219 is a countersunk screw; 311 is a fixed plate. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] The same components are denoted by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings.

[0031] A bridge weighing sensor, as shown in the drawings, comprises a fixed base 1, a weighing sensor assembly 2 and a bridge pile leg 3. Figures 1-5 The fixed base 1 is a square block, a first placement circular groove 111 is formed on the top of the fixed base 1, a second placement circular groove 112 is formed on the bottom of the first placement circular groove 111, the weighing sensor assembly 2 is located in the second placement circular groove 112, and the bridge pile leg 3 is placed in the first placement circular groove 111.

[0032] The bridge pile leg 3 is in a cylindrical shape, the lower end of the bridge pile leg 3 is inserted into the first placement circular groove 111, the bottom of the bridge pile leg 3 abuts against the top of the weighing sensor assembly 2, the upper end and the lower end of the side wall of the bridge pile leg 3 are both circumferentially provided with four fixing plates 311, the bridge pile leg 3 is connected with the top flange of the fixed base 1 through the four fixing plates 311 at the lower end, two first circular perforations are formed in each fixing plate 311, eight first threaded holes are formed in the top of the fixed base 1, a first bolt is placed in each first circular perforation and is screwed into the corresponding first threaded hole, so as to fix the bridge pile leg 3 on the top of the fixed base 1.

[0033] The weighing sensor assembly 2 comprises a first force receiving circular ring 211, a second force receiving circular ring 212 and a third force receiving circular ring 213 with the same center and consistent thickness, the inner diameter of the second force receiving circular ring 212 is 1.4 times the outer diameter of the first force receiving circular ring 211, and the inner diameter of the third force receiving circular ring 213 is 1.3 times the outer diameter of the second force receiving circular ring 212.

[0034] Eight strain beams 214 are circumferentially arranged between the first force receiving circular ring 211 and the second force receiving circular ring 212 and between the second force receiving circular ring 212 and the third force receiving circular ring 213, a strain groove 217 is arranged on one side of the top of each strain beam 214 close to the first force receiving circular ring 211, and a shear strain gauge 218 is attached to the side wall on both sides of each strain beam 214, and thirty-two shear strain gauges 218 are connected in series to form a Wheatstone bridge.

[0035] Four wire passing holes are circumferentially formed in the side wall of the second force receiving circular ring 212 and the third force receiving circular ring 213, the four wire passing holes are respectively located between two strain beams 214, a wire passing groove is formed in the top of the fixed base 1, and the wire passing groove is communicated with the first placement circular groove 111 and the second placement circular groove 112. The connecting wire of each shear strain gauge 218 passes through the wire passing hole and is located in the wire passing groove, and then is connected with the outside through the wire passing groove.

[0036] The thickness of the strain beams 214 is three-fifths of the thickness of the first force receiving circular ring 211, the strain beams 214 are centrally placed, the top and the bottom of the eight strain beams 214 between the first force receiving circular ring 211 and the second force receiving circular ring 212 are provided with a first cover plate 215 in a circular ring shape, and the top and the bottom of the eight strain beams 214 between the second force receiving circular ring 212 and the third force receiving circular ring 213 are provided with a second cover plate 216 in a circular ring shape.

[0037] The first force receiving circular ring 211 and the second force receiving circular ring 212 and the second force receiving circular ring 212 and the third force receiving circular ring 213 are both filled with sealing silica gel.

[0038] The top and bottom of each strain beam 214 are provided with threaded holes, the top of each first cover plate 215 and second cover plate 216 are provided with a plurality of circular through holes corresponding to the threaded holes, each circular through hole is provided with a countersunk screw 219, and each countersunk screw 219 is threadedly connected with the corresponding threaded hole.

[0039] The eight strain beams 214 between the first stress ring 211 and the second stress ring 212 are provided with first rounded corners between the strain beams 214 and the side walls fixedly connected with the strain beams 214.

[0040] The eight strain beams 214 between the second stress ring 212 and the third stress ring 213 are provided with second rounded corners between the strain beams 214 and the side walls fixedly connected with the strain beams 214. Through the arrangement of the first rounded corners and the second rounded corners, the stability of the connection between the strain beams 214 and the corresponding first stress ring 211, second stress ring 212 and third stress ring 213 can be strengthened.

[0041] Specific implementation process:

[0042] The working principle of the bridge weighing sensor is that the weighing sensor assembly 2 under the bridge pile leg 3 is connected with a measuring instrument outside, when a vehicle passes through the bridge, the strain beam 214 of the weighing sensor assembly 2 under the bridge pile leg 3 is strained by the load of the weight of the vehicle, the strain signal is converted into an electric signal through a Wheatstone bridge, and signal amplification, filtering, digitization and other processing are carried out, and finally the changed weight is measured.

[0043] The specific embodiment is only an explanation of the utility model, and is not a limitation of the utility model, and those skilled in the art can make modifications without creative contribution according to the needs after reading the specification, but as long as it is within the scope of the claims of the utility model, it is protected by the patent law.

Claims

1. A bridge weighing sensor, characterized in that: The system includes a fixed base (1), a weighing sensor assembly (2), and a bridge pile support leg (3). The fixed base (1) is a square block. A first placement circular groove (111) is provided on the top of the fixed base (1), and a second placement circular groove (112) is provided at the bottom of the first placement circular groove (111). The weighing sensor assembly (2) is located in the second placement circular groove (112), and the bridge pile support leg (3) is placed in the first placement circular groove (111). The weighing sensor assembly (2) includes a first force-bearing ring (211), a second force-bearing ring (212), and a third force-bearing ring (213) with the same center and thickness. Eight strain beams (214) are arranged in a circular array between the first force-bearing ring (211) and the second force-bearing ring (212), and between the second force-bearing ring (212) and the third force-bearing ring (213). The top and bottom of the eight strain beams (214) located between the first force-bearing ring (211) and the second force-bearing ring (212) are provided with a first ring-shaped cover plate (215). The top and bottom of the eight strain beams (214) located between the second force-bearing ring (212) and the third force-bearing ring (213) are provided with a second ring-shaped cover plate (216). Each strain beam (214) has a strain groove (217) on the side of its top closest to the first force-bearing ring (211). Shear strain gauges (218) are attached to the sidewalls on both sides of each strain beam (214), and the thirty-two shear strain gauges (218) are connected in series to form a Wheatstone bridge. The space between the first force-bearing ring (211) and the second force-bearing ring (212), and the space between the second force-bearing ring (212) and the third force-bearing ring (213) are filled with sealing silicone.

2. A bridge weighing sensor according to claim 1, characterized in that: The thickness of several strain beams (214) is three-fifths of the thickness of the first stressed ring (211), and the strain beams (214) are all placed in the center.

3. A bridge weighing sensor according to claim 1, characterized in that: The second force-bearing ring (212) and the third force-bearing ring (213) have four wire-passing holes arranged in the circumferential array on their side walls. The four wire-passing holes are located between the two strain beams (214). The top of the fixed base (1) has a wire-passing groove, which is connected to the first placement groove (111) and the second placement groove (112).

4. A bridge weighing sensor according to claim 1, characterized in that: Each strain beam (214) has threaded holes at its top and bottom. Each first cover plate (215) and second cover plate (216) has several circular through holes corresponding to the threaded holes at its top. Each circular through hole has a countersunk screw (219) inside it. Each countersunk screw (219) is threadedly connected to its corresponding threaded hole.

5. A bridge weighing sensor according to claim 1, characterized in that: The bridge pile support leg (3) is cylindrical. The lower end of the bridge pile support leg (3) is inserted into the first placement circular groove (111). The upper and lower ends of the side wall of the bridge pile support leg (3) are provided with four fixing plates (311) arranged in a circular array. The bridge pile support leg (3) is connected to the top flange of the fixed base (1) through the four fixing plates (311) at the lower end.

6. A bridge weighing sensor according to claim 1, characterized in that: The eight strain beams (214) between the first stress ring (211) and the second stress ring (212) are all provided with a first rounded corner between them and the side wall that is fixedly connected to them; The eight strain beams (214) between the second stress ring (212) and the third stress ring (213) and their fixedly connected sidewalls are all provided with a second rounded corner.

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