Bridge angle alarm device and detection method

Abstract

The invention discloses a bridge angle alarm device and a detection method, and the device comprises a pedestal which is internally provided with a mercury cavity, and the mercury cavity is filled with mercury; a plurality of electrode conduits which are obliquely arranged at the same angle are annularly distributed at the upper end of the base, and the electrode conduits are hollow and are communicated with the mercury cavity; a valve mechanism is arranged at the bottom end of the electrode catheter; an electrode adjusting mechanism is arranged at the top end of the electrode conduit, a plurality of electrode bars are connected to the lower end of the electrode adjusting mechanism, and a mercury level detection device is arranged at the lower ends of the electrode bars. According to the invention, through real-time monitoring of the bridge, hidden dangers of the bridge can be quickly found, and safety accidents are prevented.

Description

Technical Field

[0001] The invention relates to a bridge angle alarm device and a detection method, belonging to the technical field of bridge safety. Background Art

[0002] The bridge structure is a key component of the traffic route and the throat of the traffic connection between various regions. As a flexible structure, the bridge is forced to vibrate under the dynamic effects of automobile loads, wind loads, earthquakes, etc., resulting in displacement, deflection, torsion, etc. These vibration responses always threaten the operational safety of the bridge. For example, the Chinese invention patent with the publication number CN118032773A discloses an alarm device based on the health detection of the bridge structure, and specifically discloses: a limit plate is fixedly connected to one side of the mounting frame, the bottom outer wall of the sliding rod at the top of the limit plate is rotatably connected to a rotating frame, a rangefinder is fixedly connected to one side of the rotating frame, and a waist-shaped hole is opened on one side of the detection plate on one side of the rotating frame for use with the infrared rays emitted by the rangefinder; a camera is set on the rotating frame for surveying the damaged part; a controller and an alarm are set in the display, the camera is connected to the display by wires, and is used to alarm the detected damaged part, the controller is connected to the rangefinder by wires, and the alarm is connected to the controller by wires; a transmission mechanism is set on the limit plate to drive the sliding rod to move downward, and drive the rotating frame to rotate, so that the detection plate contacts the bottom of the bridge. This solution uses rangefinders and cameras to conduct safety inspections on bridges, but can only detect external damage to the bridges. It also requires frequent movement to conduct a comprehensive inspection of the bridge, making it slow to detect hidden dangers. Summary of the invention

[0003] The purpose of the present invention is to provide a bridge angle alarm device and detection method. The present invention can quickly discover bridge hidden dangers and prevent safety accidents through real-time monitoring of the bridge.

[0004] The technical solution of the present invention is as follows: a bridge angle alarm device comprises a base, wherein the base has a mercury cavity filled with mercury; a plurality of electrode conduits inclined at the same angle are distributed in a ring on the upper end of the base, the electrode conduits are hollow inside and communicated with the mercury cavity; a valve mechanism is provided at the bottom end of the electrode conduit; an electrode adjustment mechanism is provided at the top end of the electrode conduit, a plurality of electrode rods are connected to the lower end of the electrode adjustment mechanism, and a mercury level detection device is provided at the lower end of the electrode rods.

[0005] The above-mentioned bridge angle alarm device, the valve mechanism includes a valve housing, the valve housing has a through groove, the inner wall of the through groove has an inner ring with a right-angled triangle cross-section; a valve core is arranged in the through groove, the upper end side wall of the valve core is provided with an inclined portion, and the inclined portion fits with the hypotenuse of the inner ring; a circular ring is arranged at the bottom of the valve core, and a first spring is arranged at the upper end of the circular ring, the first spring surrounds the outside of the valve core and the other end is fixedly connected to the right-angle portion of the bottom end of the inner ring; a moving iron core is arranged at the upper end of the valve core, a second spring is arranged at the upper end of the moving iron core, a static iron core is arranged at the upper end of the second spring, and a plurality of coil rods are arranged at the lower end of the static iron core.

[0006] The aforementioned bridge angle alarm device, the electrode adjustment mechanism includes an adjustment block arranged in the electrode conduit, the side of the adjustment block is provided with a first thread; the side wall of the electrode conduit is provided with a second thread, the second thread is screwed with the first thread; the electrode rod is arranged at the bottom of the adjustment block; the upper end of the adjustment block is symmetrically provided with a rotating handle; the middle of the adjustment block is provided with a coil through hole.

[0007] In the aforementioned bridge angle alarm device, a position scale marking line is provided on the side wall of the electrode catheter.

[0008] The aforementioned bridge angle alarm device, the mercury level detection device includes an outer shell, a power supply and a resistor are arranged inside the outer shell; a conductive column is arranged at the bottom of the outer shell; the negative pole of the power supply is connected to the electrode rod; the positive pole of the power supply is connected to the resistor, and the other end of the resistor is connected to the conductive column.

[0009] In the aforementioned bridge angle alarm device, the number of electrode catheters is 8 and they are distributed in the inclination directions of east, west, south, north, southeast, northeast, southwest and northwest.

[0010] The detection method of the aforementioned bridge angle alarm device is to fix the base at the key load-bearing component of the bridge, and adjust the position of the electrode rod through the electrode adjustment mechanism according to the inclination angle of the installation position to prevent the alarm from being triggered when the bridge is in a normal state; when the bridge is tilted due to the load, the mercury in the mercury cavity will flow through the valve mechanism to the corresponding electrode conduit in the inclination direction; when the inclination angle of the bridge is too large or the inclination time is too long, the mercury in the electrode conduit contacts the electrode rod to a certain extent, so that the circuit between the mercury level detection device and the electrode rod is connected, an electrical signal appears, and the generated electrical signal is detected by an external voltmeter and an alarm is issued to prevent safety accidents in the bridge.

[0011] The detection method of the aforementioned bridge angle alarm device is that when the mercury in the mercury chamber passes through the valve mechanism due to inclination, the mercury contacts the bottom end of the valve core and squeezes it outward, so that the first spring is compressed, and a gap appears between the inclined portion of the valve core and the inclined edge of the inner ring, and the mercury flows from the gap into the electrode conduit; when the load disappears and the bridge is restored, the mercury in the mercury chamber no longer squeezes the valve core, and under the action of the gravity of the first spring and the mercury in the electrode conduit, the valve core is reset, the inclined portion fits with the inclined edge of the inner ring, and the outflowing mercury is temporarily stored in the electrode conduit; if the bridge is tilted at a large angle multiple times in a short period of time , which will cause more and more mercury to remain in the electrode catheter until it contacts the electrode rod and triggers the alarm; if the bridge does not change for a long time, the coil rod will be energized to make the static iron core generate magnetic force and attract the moving iron core. Since the coil rod is set below the static iron core, it will contact the inner ring and prevent the static iron core from moving, so that the static iron core attracts the moving iron core to move upward, and a gap will appear between the oblique part of the valve core and the oblique side of the inner ring, and the mercury will flow back into the mercury cavity from the gap; after the mercury in the electrode catheter has flowed out, the coil rod is disconnected from the power supply, and the valve core is quickly reset under the action of the first spring and the second spring.

[0012] In the detection method of the bridge angle alarm device, the voltage V detected by the external voltmeter is out The formula is as follows:

[0013]

[0014] Among them, V cc is the power supply voltage, R f is the resistance value of the resistor, R m is the effective resistance of the electrode rod, R m The expression formula is as follows:

[0015]

[0016] Where L is the total length of the electrode rod, h g is the length of the electrode rod immersed in mercury, R d is the total resistance of the electrode rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention can be set at key load-bearing components of the bridge, such as bridge towers to monitor the top angle of the tower, beam ends to monitor the horizontal and vertical angles of the beam ends, and main beams to monitor the beam end angles. Mercury flows into the electrode conduit to continuously measure and record the changes in the inclination angles of these parts to observe the slight deformation of the bridge when it is subjected to static and dynamic loads, thereby detecting the health of the bridge.

[0019] 2. The valve mechanism of the present invention allows the mercury in the mercury chamber to flow normally into the electrode catheter, and at the same time can control whether this part of mercury is temporarily retained in the electrode catheter, so as to warn the staff for maintenance. If there is no abnormality after maintenance, the valve mechanism can be energized to allow the mercury in the electrode catheter to flow back to the mercury chamber.

[0020] 3. When installing the present invention, the staff can adjust the height of the electrode rod by rotating the handle according to the characteristics of the bridge (such as different bearing forces and unequal installation positions) and perform electronic calibration to make it more responsive and less error-prone during work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 is a cross-sectional view of the present invention;

[0023] Figure 3 is a schematic diagram of the internal structure of the electrode catheter;

[0024] Figure 4 It is a schematic diagram of the structure of the valve mechanism;

[0025] Figure 5 It is a structural schematic diagram of a mercury level detection device;

[0026] Figure 6 It is the circuit diagram of the mercury level detection device.

[0027] The marks in the accompanying drawings are: 1-base, 2-mercury chamber, 3-electrode catheter, 4-valve mechanism, 5-electrode adjustment mechanism, 6-electrode rod, 7-mercury level detection device, 10-valve housing, 11-through groove, 12-inner ring, 13-valve core, 14-inclined portion, 15-circular ring, 16-first spring, 17-moving iron core, 18-second spring, 19-static iron core, 20-coil rod, 30-adjusting block, 31-first thread, 32-second thread, 33-rotating handle, 34-position scale calibration line, 35-coil through hole, 40-outer housing, 41-power supply, 42-resistance element, 43-conductive column. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0029] Embodiment: A bridge angle alarm device, comprising: Figure 1-5 As shown, it is arranged inside the bridge and includes a base 1, as shown Figure 2As shown, the base 1 has a mercury cavity 2 filled with mercury; the base 1 is provided with 8 electrode conduits 3 arranged at the same angle and distributed in the east, west, south, north, southeast, northeast, southwest and northwest directions; the electrode conduits 3 are hollow inside and communicated with the mercury cavity 2; Figure 3 As shown, a valve mechanism 4 is provided at the bottom end of the electrode conduit 3; an electrode adjustment mechanism 5 is provided at the top end of the electrode conduit 3, a plurality of electrode rods 6 are connected to the lower end of the electrode adjustment mechanism 5, and a mercury level detection device 7 is provided at the lower end of the electrode rods 6;

[0030] Preferably, if Figure 4 As shown, the valve mechanism 4 includes a valve housing 10, the valve housing 10 has a through groove 11, and the inner wall of the through groove 11 has an inner ring 12 with a right-angled triangle cross-section; a valve core 13 is arranged in the through groove 11, and the upper end side wall of the valve core 13 is provided with an inclined portion 14, and the inclined portion 14 fits with the hypotenuse of the inner ring 12; a circular ring 15 is arranged at the bottom of the valve core 13, and a first spring 16 is arranged at the upper end of the circular ring 15, the first spring 16 surrounds the outer side of the valve core 13 and the other end is fixedly connected to the right-angled portion of the bottom end of the inner ring 12; a moving iron core 17 is arranged at the upper end of the valve core 13, a second spring 18 is arranged at the upper end of the moving iron core 17, a static iron core 19 is arranged at the upper end of the second spring 18, and a plurality of coil rods 20 are arranged at the lower end of the static iron core 19.

[0031] Preferably, if Figure 3 As shown, the electrode adjustment mechanism 5 includes an adjustment block 30 arranged in the electrode conduit 3, and a first thread 31 is arranged on the side of the adjustment block 30; a second thread 32 is arranged on the side wall of the electrode conduit 3, and the second thread 32 is screwed with the first thread 31; the electrode rod 6 is arranged at the bottom of the adjustment block 30; a rotating handle 33 is symmetrically arranged on the upper end of the adjustment block 30; a coil through hole 35 is arranged in the middle of the adjustment block 30, and the wiring of the external voltmeter passes through the coil through hole 35 and is connected to both sides of the resistor 42. A position scale calibration line 34 is arranged on the side wall of the electrode conduit 3. The adjustment block 30 is rotated by twisting the rotating handle 33, and the upper and lower positions of the adjustment block 30 are adjusted by the first thread 31 and the second thread 32 when the adjustment block 30 rotates. Therefore, during installation, the staff can adjust the height of the electrode rod 6 by rotating the handle 33 according to the characteristics of the bridge (such as different bearing forces and unequal installation positions), and perform electronic calibration, so that the reaction is more sensitive and the error is smaller during work.

[0032] Preferably, if Figure 5As shown, the mercury level detection device 7 includes an outer shell 40, in which a power source 41 and a resistor 42 are arranged; a conductive column 43 is arranged at the bottom of the outer shell 40; the negative electrode of the power source 41 is connected to the electrode rod 6; the positive electrode of the power source 41 is connected to the resistor 42, and the other end of the resistor 42 is connected to the conductive column 43. When mercury does not flow into the electrode conduit 3 and contact the electrode rod 6, the circuit inside the mercury level detection device 7 is not connected.

[0033] According to the detection method of the bridge angle alarm device mentioned above, the base 1 is fixedly installed at the key load-bearing components of the bridge, such as the bridge tower to monitor the tower top angle, the beam end to monitor the horizontal and vertical angle piers of the beam end, the main beam to monitor the beam end angle, etc., and the position of the electrode rod 6 is adjusted by the electrode adjustment mechanism 5 according to the inclination angle of the installation position to prevent the alarm from being triggered when the bridge is in a normal state; when the bridge is tilted due to the load, the mercury in the mercury chamber 2 will flow through the valve mechanism 4 to the corresponding electrode conduit 3 in the inclination direction; when the inclination angle of the bridge is too large or the inclination time is too long, so that the mercury in the electrode conduit 3 reaches a certain degree of contact with the electrode rod 6, the circuit between the mercury level detection device 7 and the electrode rod 6 is connected, an electrical signal appears, and the generated electrical signal is detected by an external voltmeter and an alarm is issued to prevent safety accidents in the bridge.

[0034] When the mercury in the mercury chamber 2 passes through the valve mechanism 4 due to its tilt, the mercury contacts the bottom end of the valve core 13 and squeezes it outward, so that the first spring 16 is compressed, and a gap appears between the inclined portion 14 of the valve core 13 and the inclined edge of the inner ring 12, and the mercury flows into the electrode catheter 3 from the gap; when the load disappears and the bridge is restored, the mercury in the mercury chamber 2 no longer squeezes the valve core 13, and under the action of the first spring 16 and the gravity of the mercury in the electrode catheter 3, the valve core 13 is reset, and the inclined portion 14 fits with the inclined edge of the inner ring 12, temporarily storing the outflowing mercury in the electrode catheter 3; if the bridge is tilted at a large angle for many times in a short period of time, the mercury retained in the electrode catheter 3 will be trapped in the electrode catheter 3. More and more silver accumulates until it contacts the electrode rod 6 and triggers the alarm. If the bridge does not change for a long time, the coil rod 20 is energized to cause the static iron core 19 to generate magnetic force and attract the moving iron core 17. Since the coil rod 20 is arranged below the static iron core 19, it will contact the inner ring 12, making the static iron core 19 unable to move. As a result, the static iron core 19 attracts the moving iron core 17 to move upward, and a gap appears between the inclined portion 14 of the valve core 13 and the inclined edge of the inner ring 12. Mercury flows back into the mercury chamber 2 from the gap. After the mercury in the electrode catheter 3 has flowed out, the coil rod 20 is disconnected from the power supply, and the valve core 13 is quickly reset under the action of the first spring 16 and the second spring 18.

[0035] like Figure 6As shown, the external voltmeter connects the circuit to both sides of the resistor 42, that is, the external voltmeter detects the voltage on the resistor 42; when the mercury contacts the electrode rod 6, the mercury is equivalent to a wire, connecting the conductive column 43 and the electrode rod 6; because the mercury level detection device 7 is a series circuit inside, when the mercury just contacts the electrode rod 6, the effective part of the electrode rod 6 connected to the circuit is small, that is, the effective resistance value is small, so that the voltage on the resistor 42 is large, and a large fluctuation appears on the external voltmeter, thereby triggering an alarm.

[0036] The voltage V detected by the external voltmeter out The formula is as follows:

[0037]

[0038] Among them, V cc is the power supply voltage, R f is the resistance value of the resistor, R m is the effective resistance of the electrode rod, R m The expression formula is as follows:

[0039]

[0040] Where L is the total length of the electrode rod, h g is the length of the electrode rod immersed in mercury, R d is the total resistance of the electrode rod.

[0041] In summary, the present invention can quickly discover bridge hidden dangers and prevent safety accidents through real-time monitoring of bridges, and has the advantages of high accuracy and fast detection efficiency.

Claims

1. A bridge angle alarm device, characterized in that: The invention comprises a base (1), wherein the base (1) has a mercury cavity (2) filled with mercury; a plurality of electrode conduits (3) arranged at the same angle and tilted are distributed in an annular manner on the upper end of the base (1); the electrode conduits (3) are hollow inside and communicate with the mercury cavity (2); a valve mechanism (4) is provided at the bottom end of the electrode conduit (3); an electrode adjustment mechanism (5) is provided at the top end of the electrode conduit (3); a plurality of electrode rods (6) are connected to the lower end of the electrode adjustment mechanism (5); a mercury level detection device (7) is provided at the lower end of the electrode rods (6).

2. The bridge angle alarm device according to claim 1, characterized in that: The valve mechanism (4) comprises a valve housing (10), wherein the valve housing (10) has a through groove (11), and the inner wall of the through groove (11) has an inner ring (12) with a right-angled triangle cross section; a valve core (13) is arranged in the through groove (11), and the upper end side wall of the valve core (13) is provided with an inclined portion (14), and the inclined portion (14) is matched with the hypotenuse of the inner ring (12); a circular ring (15) is arranged at the bottom of the valve core (13), and a first spring (16) is arranged at the upper end of the circular ring (15), and the first spring (16) surrounds the outer side of the valve core (13) and the other end is fixedly connected to the right-angled portion of the bottom end of the inner ring (12); a moving iron core (17) is arranged at the upper end of the moving iron core (17), and a second spring (18) is arranged at the upper end of the second spring (18), and a static iron core (19) is arranged at the upper end of the second spring (18), and a plurality of coil rods (20) are arranged at the lower end of the static iron core (19).

3. The bridge angle alarm device according to claim 1, characterized in that: The electrode adjustment mechanism (5) comprises an adjustment block (30) arranged in the electrode catheter (3), the side of the adjustment block (30) being provided with a first thread (31); the side wall of the electrode catheter (3) being provided with a second thread (32), the second thread (32) being screwed together with the first thread (31); the electrode rod (6) being arranged at the bottom of the adjustment block (30); the upper end of the adjustment block (30) being symmetrically provided with a rotating handle (33); and the middle of the adjustment block (30) being provided with a coil through hole (35).

4. The bridge angle alarm device according to claim 1, characterized in that: Position scale marking lines (34) are provided on the side wall of the electrode catheter (3).

5. The bridge angle alarm device according to claim 1, characterized in that: The mercury level detection device (7) comprises an outer shell (40), wherein a power source (41) and a resistor (42) are arranged inside the outer shell (40); a conductive column (43) is arranged at the bottom of the outer shell (40); the negative electrode of the power source (41) is connected to the electrode rod (6); the positive electrode of the power source (41) is connected to the resistor (42), and the other end of the resistor (42) is connected to the conductive column (43).

6. The bridge angle alarm device according to claim 1, characterized in that: The number of the electrode catheters (3) is 8 and they are distributed in the oblique directions of east, west, south, north, southeast, northeast, southwest and northwest.

7. The detection method of the bridge angle alarm device according to any one of claims 1 to 6, characterized in that: The base is fixedly set at the key load-bearing component of the bridge, and the position of the electrode rod is adjusted by the electrode adjustment mechanism according to the inclination angle of the installation position to prevent the alarm from being triggered when the bridge is in a normal state; when the bridge is tilted due to load, the mercury in the mercury cavity will flow through the valve mechanism to the corresponding electrode conduit in the direction of inclination; when the inclination angle of the bridge is too large or the inclination time is too long, the mercury in the electrode conduit contacts the electrode rod to a certain extent, so that the circuit between the mercury level detection device and the electrode rod is connected, an electrical signal is generated, and the generated electrical signal is detected by an external voltmeter and an alarm is issued to prevent safety accidents of the bridge.

8. The detection method of the bridge angle alarm device according to claim 7, characterized in that: When the mercury in the mercury cavity passes through the valve mechanism due to inclination, the mercury contacts the bottom end of the valve core and squeezes it outward, so that the first spring is compressed, and a gap appears between the inclined portion of the valve core and the inclined edge of the inner ring, and the mercury flows into the electrode conduit from the gap; when the load disappears and the bridge is restored, the mercury in the mercury cavity no longer squeezes the valve core, and under the action of the gravity of the first spring and the mercury in the electrode conduit, the valve core is reset, and the inclined portion fits the inclined edge of the inner ring, temporarily storing the outflowing mercury in the electrode conduit; if the bridge is tilted at a large angle for many times in a short period of time, the mercury retained in the electrode conduit will increase until it contacts the electrode rod and triggers an alarm; if the bridge does not change for a long time, by energizing the coil rod, the static iron core generates magnetic force and attracts the moving iron core, because the coil rod is arranged below the static iron core, it will contact the inner ring and make the static iron core unable to move, so that the static iron core attracts the moving iron core to move upward, and a gap appears between the inclined portion of the valve core and the inclined edge of the inner ring, and the mercury flows back into the mercury cavity from the gap; After the mercury in the electrode catheter has flowed out, the power supply to the coil rod is disconnected, and the valve core is quickly reset under the action of the first spring and the second spring.

9. The detection method of the bridge angle alarm device according to claim 6, characterized in that: The voltage V detected by the external voltmeter out The formula is as follows: Among them, V cc is the power supply voltage, R f is the resistance value of the resistor, R m is the effective resistance of the electrode rod, R m The expression formula is as follows: Where L is the total length of the electrode rod, h g is the length of the electrode rod immersed in mercury, R d is the total resistance of the electrode rod.

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