Cable clamp slippage monitoring device based on grating sensor

Abstract

The utility model discloses a cable clamp slippage monitoring device based on grating sensors, and belongs to the technical field of cable clamp slippage monitoring. The utility model aims to solve the problems of poor measurement precision and incapability of accurately acquiring slippage displacement of the conventional cable clamp slippage device. Fixed clamping pieces are clamped on the two sides of a cable clamp, one side of each fixed clamping piece is provided with an extending piece protruding outwards, three upper fixing pieces are fixed to each extending piece at equal intervals, four lower fixing pieces are fixed to the side face of the cable clamp, and the three upper fixing pieces and the four lower fixing pieces are arranged in parallel in a staggered mode. Six grating sensors are fixed on the outer sides of the three upper fixing pieces, and the four lower fixing pieces correspond to detection heads of the six grating sensors; the grating sensor is used for collecting stress signals of contact between the cable clamp and the lower fixing piece during movement and sending the collected signals to the controller. And the controller sends the received stress signal and the serial number of the corresponding sensor out through the wireless communication circuit. The cable clamp slip monitoring device is suitable for monitoring cable clamp slip.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable clamp slippage monitoring. Background Art

[0002] Cable clamps are key load-bearing components of suspension bridge superstructures. Their primary function is to clamp the main cable strands and connecting suspenders, transferring the bridge deck load to the main cables. Once the clamp bolts are tightened, they can slip over time due to environmental factors such as loosening of the bolt material, weakening of the main cable, and deformation of the clamp, leading to a reduction in pretension. Clamp slip is a nearly irreversible defect that redistributes internal forces and alters the bridge deck's alignment. Rainwater can also infiltrate the main cables, causing them to rust. This slippage can also occur over time, severely impacting the overall structural performance and the durability of the main cables.

[0003] Currently, common bridge cable clamp monitoring solutions on the market primarily rely on indirect methods to determine the clamping force by slackening the clamp bolt material. These methods rely on signals such as acoustic waves to measure changes in bolt elongation or the bolt's unscrew angle to determine the bolt's tension. These indirect methods are unable to effectively detect clamp slippage caused by cable or clamp deformation, nor can they directly measure the actual clamp preload. Consequently, measurement results are poor, and accurate estimates of slippage distance are impossible. Utility Model Content

[0004] The utility model aims to solve the problem that the existing cable clamp sliding device has poor measurement accuracy and cannot accurately obtain the sliding displacement, and provides a cable clamp sliding monitoring device based on a grating sensor.

[0005] The cable clamp slippage monitoring device based on grating sensors of the utility model comprises: six grating sensors, a wireless communication circuit, a controller, an indicator light, four lower fixing parts, three upper fixing parts and a fixing support part;

[0006] The fixed supporting member includes two clamping pieces, which are clamped on the cables of the suspension bridge by fastening bolts, and each supporting piece is of door frame type, and the two vertical parts of the two door frame-type supporting pieces are respectively located on both sides of the cable clamp, and the bottom edge of the middle crossbeam part of one supporting piece is provided with an outwardly protruding extension piece, and three upper fixing pieces are fixed on the extension piece at equal intervals, and the three upper fixing pieces are rectangular, and the long sides of the rectangular fixing pieces are vertically downward and located on the side faces of the cable clamp, and four lower fixing pieces are fixed on the side faces of the cable clamp, and the three upper fixing pieces and the four lower fixing pieces are staggered and parallel, and six grating sensors are fixed on the outer sides of the three upper fixing pieces, and the four lower fixing pieces correspond to the detection heads of the six grating sensors;

[0007] The detection heads of the six grating sensors are three facing left and three facing right, and the distances between the detection heads of the three grating sensors in one direction and the corresponding lower fixing members are not equal;

[0008] The grating sensor is used to collect stress signals when the cable clamp moves and contacts the lower fixing member, and sends the collected signals to the controller;

[0009] The controller sends the received stress signal and the corresponding sensor number through the wireless communication circuit.

[0010] Furthermore, in the present invention, the distance between the detection heads of the three optical fiber sensors to the left of the detection heads and the corresponding lower fixing parts increases from left to right, and the distance between the detection heads of the three optical fiber sensors to the right of the detection heads and the corresponding lower fixing parts increases from right to left.

[0011] Furthermore, in the present invention, the three optical fiber sensors to the left of the detection head are, from left to right, the first optical fiber sensor on the left, the second optical fiber sensor on the left, and the third optical fiber sensor on the left. The distance between the detection head of the first optical fiber sensor on the left and the corresponding lower fixing piece is 1 cm, the distance between the detection head of the second optical fiber sensor on the left and the corresponding lower fixing piece is 2 cm, and the distance between the detection head of the third optical fiber sensor on the left and the corresponding lower fixing piece is 3 cm.

[0012] The three fiber optic sensors to the right of the detection head are, from left to right, the third fiber optic sensor on the right, the second fiber optic sensor on the right, and the first fiber optic sensor on the right. The distance between the detection head of the third fiber optic sensor on the right and the corresponding lower fixing part is 1 cm, the distance between the detection head of the second fiber optic sensor on the right and the corresponding lower fixing part is 2 cm, and the distance between the detection head of the first fiber optic sensor on the right and the corresponding lower fixing part is 3 cm.

[0013] Furthermore, the present invention also includes an indicator light. The controller receives a signal from any optical fiber sensor and drives the indicator light 6 to turn on.

[0014] Furthermore, the present invention also includes a power supply circuit, which is used to supply power to the six grating sensors, the wireless communication circuit, the controller and the indicator light.

[0015] Furthermore, the present invention includes a circuit protection box, which is fixed to a side of a clamping piece and is used to place a wireless communication circuit, a controller and a power supply circuit.

[0016] When the cable clamp of the utility model slips, relative movement occurs between the fixed supporting part and the cable clamp. The optical fiber sensor obtains the stress signal by contacting the lower fixing part and transmits it to the controller, and then an alarm is issued through the wireless communication circuit, which effectively ensures the accuracy of slip detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the cable clamp slippage monitoring device based on the grating sensor of the present invention installed on the cable;

[0018] Figure 2 This is the electrical principle block diagram of the cable clamp slippage monitoring device based on the grating sensor;

[0019] Figure 3 It is a schematic diagram of the existing cable clamp structure. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0022] Specific implementation method 1: Figure 1 and Figure 2 This embodiment is described, and includes: six grating sensors, a wireless communication circuit 4, a controller 5, an indicator light 6, four lower fixing members 10, three upper fixing members 11 and a fixing support member 12;

[0023] The fixed supporting member 12 includes two clamping plates, which are clamped on the suspension bridge cables by fastening bolts, and each supporting member is of a door frame type. The two vertical parts of the two door frame-type supporting members are respectively located on both sides of the cable clamp. The bottom edge of the middle crossbeam part of one supporting member is provided with an outwardly protruding extension plate, and three upper fixing members 11 are fixed on the extension plate at equal intervals. The three upper fixing members 11 are rectangular, and the long sides of the rectangular fixing members are vertically downward and located on the side of the cable clamp. Four lower fixing members 10 are fixed on the side of the cable clamp. The three upper fixing members 11 and the four lower fixing members 10 are staggered and parallel. Six grating sensors are fixed on the outer sides of the three upper fixing members 11, and the four lower fixing members 10 correspond to the detection heads of the six grating sensors.

[0024] The detection heads of the six grating sensors are three to the left and three to the right, and the distances between the three grating sensor detection heads in one direction and the corresponding lower fixing member 10 are not equal;

[0025] The grating sensor is used to collect stress signals when the cable clamp moves and contacts the lower fixing member, and sends the collected signals to the controller 5;

[0026] The controller 5 sends the received stress signal and the corresponding sensor number through the wireless communication circuit 4 .

[0027] Furthermore, in this embodiment, the distance between the detection heads of the three optical fiber sensors to the left of the detection head and the corresponding lower fixing parts 10 increases from left to right, and the distance between the detection heads of the three optical fiber sensors to the right of the detection head and the corresponding lower fixing parts 10 increases from right to left.

[0028] Furthermore, in this embodiment, the three optical fiber sensors to the left of the detection head are, from left to right, the first left optical fiber sensor 1, the second left optical fiber sensor 2, and the third left optical fiber sensor 3. The distance between the detection head of the first left optical fiber sensor 1 and the corresponding lower fixing piece 10 is 1 cm, the distance between the detection head of the second left optical fiber sensor 2 and the corresponding lower fixing piece 10 is 2 cm, and the distance between the detection head of the third left optical fiber sensor 3 and the corresponding lower fixing piece 10 is 3 cm.

[0029] The three fiber optic sensors to the right of the detection head are, from left to right, the third fiber optic sensor 9 on the right, the second fiber optic sensor 8 on the right, and the first fiber optic sensor 7 on the right. The distance between the detection head of the third fiber optic sensor 9 and the corresponding lower fixing part 10 is 1 cm, the distance between the detection head of the second fiber optic sensor 8 on the right and the corresponding lower fixing part 10 is 2 cm, and the distance between the detection head of the first fiber optic sensor 7 and the corresponding lower fixing part 10 is 3 cm.

[0030] In the present invention, the lower fixing plate is hinged to the side of the cable clamp by bolts. After the optical fiber sensor contacts the lower fixing plate and continues to slide, the lower fixing plate rotates with the sliding force, which effectively avoids damage to the optical fiber sensor when the sliding displacement is too large.

[0031] Furthermore, in this embodiment, an indicator light 6 is also included. The controller 5 receives a signal from any optical fiber sensor and drives the indicator light 6 to turn on.

[0032] Furthermore, in this embodiment, a power supply circuit is also included, which is used to supply power to the six grating sensors, the wireless communication circuit 4 , the controller 5 and the indicator light 6 .

[0033] Furthermore, in this embodiment, a circuit protection box is included. The circuit protection box is fixed to a side of a clamping piece and is used to place the wireless communication circuit 4, the controller 5 and the power supply circuit.

[0034] In the present invention, a slide groove is provided at the top of the cable clamp, a clamping piece is provided with an extension for fixing the upper fixed plate, and the other clamping piece slides in the slide groove of the cable clamp, so that the holding piece is kept above the cable clamp and the optical fiber sensor is kept on the side of the cable clamp, ensuring that when the cable clamp slides, the fixed holding piece moves relative to each other, the optical fiber sensor contacts the fixing piece of the lower fixing frame, collects stress, and transmits it to the controller, which transmits the stress signal through the wireless communication circuit. Different sensors sending signals represent different sliding directions and sliding distances, and an alarm is displayed through an indicator light. The cable clamp in the present invention is specifically as follows: Figure 3 shown.

[0035] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A cable clamp slippage monitoring device based on a grating sensor, characterized in that: include: Six grating sensors, a wireless communication circuit (4), a controller (5), an indicator light (6), four lower fixing members (10), three upper fixing members (11) and a fixing support member (12); The fixed support member (12) includes two clamping plates, which are clamped on the suspension bridge cable by fastening bolts, and each support member is door frame-shaped, and the two vertical parts of the two door frame-shaped support members are respectively located on both sides of the cable clamp. The bottom edge of the middle crossbeam part of one support member is provided with an outwardly protruding extension plate, and three upper fixing members (11) are fixed on the extension plate at equal intervals. The three upper fixing members (11) are rectangular, and the long sides of the rectangular fixing members are vertically downward and located on the side of the cable clamp. Four lower fixing members (10) are fixed on the side of the cable clamp. The three upper fixing members (11) and the four lower fixing members (10) are arranged in parallel and staggered. Six grating sensors are fixed on the outer sides of the three upper fixing members (11), and the four lower fixing members (10) correspond to the detection heads of the six grating sensors. The detection heads of the six grating sensors are three facing left and three facing right, and the distances between the three grating sensor detection heads in one direction and the corresponding lower fixing members (10) are not equal; The grating sensor is used to collect stress signals generated when the cable clamp moves and contacts the lower fixing member, and transmit the collected signals to the controller (5); The controller (5) sends the received stress signal and the corresponding sensor number through the wireless communication circuit (4).

2. The cable clamp slippage monitoring device based on a grating sensor according to claim 1 is characterized in that: The distances between the detection heads of the three optical fiber sensors facing left and the corresponding lower fixing members (10) increase sequentially from left to right, and the distances between the detection heads of the three optical fiber sensors facing right and the corresponding lower fixing members (10) increase sequentially from right to left.

3. The cable clamp slippage monitoring device based on a grating sensor according to claim 2, characterized in that: The three optical fiber sensors to the left of the detection head are, from left to right, the first optical fiber sensor (1), the second optical fiber sensor (2), and the third optical fiber sensor (3). The distance between the detection head of the first optical fiber sensor (1) and the corresponding lower fixing piece (10) is 1 cm, the distance between the detection head of the second optical fiber sensor (2) and the corresponding lower fixing piece (10) is 2 cm, and the distance between the detection head of the third optical fiber sensor (3) and the corresponding lower fixing piece (10) is 3 cm. The three optical fiber sensors to the right of the detection head are, from left to right, the third optical fiber sensor (9), the second optical fiber sensor (8), and the first optical fiber sensor (7). The distance between the detection head of the third optical fiber sensor (9) and the corresponding lower fixing piece (10) is 1 cm, the distance between the detection head of the second optical fiber sensor (8) and the corresponding lower fixing piece (10) is 2 cm, and the distance between the detection head of the first optical fiber sensor (7) and the corresponding lower fixing piece (10) is 3 cm.

4. The cable clamp slippage monitoring device based on a grating sensor according to claim 1 or 2, characterized in that: The device also includes an indicator light (6). The controller (5) receives a signal from any optical fiber sensor and drives the indicator light (6) to turn on.

5. The cable clamp slippage monitoring device based on grating sensor according to claim 1, characterized in that: The device also includes a power supply circuit, which is used to supply power to the six grating sensors, the wireless communication circuit (4), the controller (5) and the indicator light (6).

6. The cable clamp slippage monitoring device based on a grating sensor according to claim 5, characterized in that: The circuit protection box comprises a circuit protection box fixed on the side of a clamping piece and used for placing a wireless communication circuit (4), a controller (5) and a power supply circuit.

Images