Power cable laying stress monitoring device

Abstract

The invention discloses a power cable laying stress monitoring device. Permanent magnets are arranged at the two ends of the interior of a center shaft outside a pulley; the outer surface of the central shaft is coated with an elastomer; an upper bearing and a lower bearing are arranged on the outer surface of the elastomer; a strain gauge is arranged on the outer surface of the elastomer between the upper bearing and the lower bearing; the conductor rod is electrically connected with the Wheatstone bridge and the signal processing mechanism, the cable applies pressure to the pulley, the pressure acts on the elastic body through the bearing, and the strain gauge arranged on the outer surface of the elastic body deforms accordingly, so that the corresponding resistance of the strain gauge in the Wheatstone bridge changes, and the signal processing mechanism is started. The Wheatstone bridge converts the resistance change into voltage change and outputs the voltage change to the signal processing mechanism. The detection precision of the detection device on the side stress of the cable is high, and no additional power supply is needed. A good operation environment is provided for cable construction, so that laying work can be smoothly and safely carried out, and laying efficiency and construction quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cable laying monitoring, and in particular relates to a power cable laying stress monitoring device. Background Art

[0002] In the prior art, the laying of high-voltage power cables is a complicated process, especially when encountering complex line designs, numerous turns and space restrictions, which undoubtedly increases the difficulty of construction. For cables, how to effectively control the external forces on the cables during the laying process, especially the lateral pressure at the bends, is the key to ensuring that the cables are intact and maintain their insulation performance. Usually, the cable is pulled into the construction site by a wire-laying machine, and a special traction head is used to reduce damage to the cable. However, when there is a corner on the cable path, the traction force on the cable will produce a certain lateral stress. If the lateral stress exceeds the pressure range that the cable material can withstand, it may cause the cable to deform, resulting in damage to the internal structure of the cable, thereby affecting its electrical performance and service life. The formula P=T / R for calculating the lateral pressure of the cable provides an evaluation method based on a theoretical basis. Among them, P represents the lateral pressure, T is the traction force applied along the axial direction of the cable, and R is the radius of the arc formed when the cable is bent. In actual operation, there are still some uncertain factors such as the specific value of the traction force and the actual bending radius of the cable, which makes it difficult to accurately measure the tensile stress. Therefore, it can only be determined by experience or rough estimation. In addition, the professional skills of construction workers and the quality of equipment are also directly related to the safety of the cable laying process and its final effect.

[0003] In order to better realize the safe and standardized construction of cable laying and reduce the damage to cables caused by rough construction; at the same time, in order to ensure the safety of construction workers and the quality of construction, a new power cable laying stress monitoring device is needed. Summary of the invention

[0004] The object of the present invention is to provide a power cable laying stress monitoring device, which is used to solve the technical problems in the prior art that the lateral stress measurement accuracy is inaccurate and the detection device needs to be equipped with a separate power supply.

[0005] The technical solution of the present invention to solve the technical problem is: A stress monitoring device for laying power cables comprises a pulley, an upper bearing, a lower bearing, a strain gauge, a Wheatstone bridge, an elastomer, a permanent magnet, a conductor rod and a signal processing mechanism; the central axis of the pulley passes through the pulley and is covered with an elastomer on the outer surface, and permanent magnets with opposite magnetic properties are arranged at both ends inside the central axis outside the pulley; an upper bearing and a lower bearing are arranged on the outer surface of the elastomer; a strain gauge is arranged on the outer surface of the elastomer between the upper bearing and the lower bearing; the conductor rod is electrically connected to the Wheatstone bridge and the signal processing mechanism respectively, the conductor rod cuts the magnetic field of the permanent magnet to generate an electromotive force and thus provides electric energy for the Wheatstone bridge and the signal processing mechanism; the strain gauge is electrically connected to the Wheatstone bridge; the output end of the Wheatstone bridge is electrically connected to the signal processing mechanism; the cable applies pressure to the pulley, the pressure acts on the elastomer through the bearing, and the strain gauge arranged on the outer surface of the elastomer is deformed accordingly, so that the corresponding resistance of the strain gauge in the Wheatstone bridge changes, and the Wheatstone bridge converts the resistance change into a voltage change and outputs it to the signal processing mechanism.

[0006] The signal processing mechanism includes a voltage stabilizing circuit, a filtering circuit, a voltage regulating circuit, an AD conversion circuit, a single-chip microcomputer, an alarm circuit, a display unit, and a data transmission unit; the input end of the voltage stabilizing circuit is electrically connected to the output end of the Wheatstone bridge; the output end of the voltage stabilizing circuit is electrically connected to the input end of the filtering circuit; the output end of the filtering circuit is electrically connected to the output end of the voltage regulating circuit; the output end of the voltage regulating circuit is electrically connected to the input end of the AD conversion circuit; the output end of the AD conversion circuit is electrically connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is electrically connected to the input end of the alarm circuit, the input end of the display unit, and the input end of the data transmission unit, respectively, and the output end of the data transmission unit is connected to the input end of the remote controller.

[0007] The data transmission unit adopts a wireless data transmission method composed of a Mesh self-organizing network.

[0008] The wireless data transmission methods include Bluetooth, 4G / 5G, and Zigbee.

[0009] The strain gauges are symmetrically arranged along the central axis.

[0010] The strain gauge is arranged on the outer surface of the elastomer by means of an adhesive. Permanent magnets with opposite magnetic properties are arranged at two ends of the central axis by welding.

[0011] The beneficial effects of the present invention are as follows: permanent magnets with opposite magnetic properties are arranged at both ends of the center shaft, and an elastic body is coated on the outer surface; an upper bearing and a lower bearing are arranged on the outer surface of the elastic body; a strain gauge is arranged on the outer surface of the elastic body between the upper bearing and the lower bearing; a conductor bar is electrically connected to a Wheatstone bridge and a signal processing mechanism respectively, and the conductor bar cuts the magnetic field of the permanent magnet to generate an electromotive force and then provides electric energy for the Wheatstone bridge and the signal processing mechanism; the strain gauge is electrically connected to the Wheatstone bridge; the output end of the Wheatstone bridge is electrically connected to the signal processing mechanism; the cable applies pressure to the pulley, and the pressure acts on the elastic body through the bearing, and the strain gauge arranged on the outer surface of the elastic body is deformed accordingly, so that the corresponding resistance of the strain gauge in the Wheatstone bridge changes, and the Wheatstone bridge converts the resistance change into a voltage change and outputs it to the signal processing mechanism. This makes the detection device have high detection accuracy for the cable side stress and does not need to set up a separate power supply. It provides a good working environment for cable construction, so that the laying work can be carried out smoothly and safely, and the laying efficiency and construction quality are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the power cable laying stress monitoring device of the present invention; Figure 2 It is a schematic diagram of the connection relationship of the power cable laying stress monitoring device of the present invention; Reference numerals: pulley 1 , upper bearing 2 , lower bearing 3 , strain gauge 4 , elastic body 5 , permanent magnet 6 , conductor rod 7 . DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] like Figure 1As shown, the present invention discloses a stress monitoring device for laying power cables, comprising a pulley 1, an upper bearing 2, a lower bearing 3, a strain gauge 4, a Wheatstone bridge, an elastic body 5, a permanent magnet 6, a conductor bar 7, and a signal processing mechanism; the central axis of the pulley 1 passes through the pulley and is covered with the elastic body 5 on the outer surface, and permanent magnets 5 with opposite magnetic properties are arranged at both ends of the inner part of the central axis outside the pulley 1; the upper bearing 2 and the lower bearing 3 are arranged on the outer surface of the elastic body 5; the strain gauge 4 is arranged on the outer surface of the elastic body between the upper bearing 2 and the lower bearing 3, and the strain gauge 4 is symmetrically arranged on the outer surface of the elastic body along the central axis by means of adhesive adhesion, and the strain gauge 4 adopts a wide range strain gauge. The conductor bar 7 is electrically connected to the Wheatstone bridge and the signal processing mechanism respectively, and the conductor bar 7 cuts the magnetic field of the permanent magnet to generate an electromotive force and then provides electric energy for the Wheatstone bridge and the signal processing mechanism, so as to realize a self-sufficient power supply of the monitoring device, and has a simple structure. Compared with the battery-type power supply, it has the advantages of no need for replacement, immediate stop, and automatic energy supply. The strain gauge 4 is electrically connected to the Wheatstone bridge; the output end of the Wheatstone bridge is electrically connected to the signal processing mechanism; the cable applies pressure to the pulley 1, and the pressure acts on the elastic body 5 through the bearing, and the strain gauge 4 arranged on the outer surface of the elastic body 5 is deformed accordingly, so that the corresponding resistance of the strain gauge in the Wheatstone bridge changes, that is, the resistance of one arm in the Wheatstone bridge corresponding to the strain gauge changes, so that the corresponding voltage changes, and the Wheatstone bridge converts the resistance change into a voltage change and outputs it to the signal processing mechanism.

[0015] like Figure 2As shown, the signal processing mechanism includes a voltage stabilizing circuit, a filtering circuit, a voltage regulating circuit, an AD conversion circuit, a single chip microcomputer, an alarm circuit, a display unit, and a data transmission unit; the input end of the voltage stabilizing circuit is electrically connected to the output end of the Wheatstone bridge, and the voltage stabilizing circuit is set to reduce the impedance of the output end of the Wheatstone bridge to ensure that the circuit components of the signal processing mechanism are not damaged. The output end of the voltage stabilizing circuit is electrically connected to the input end of the filtering circuit, and the filtering circuit is set to filter the voltage signal; the output end of the filtering circuit is electrically connected to the output end of the voltage regulating circuit, and the voltage regulating circuit is set to regulate the voltage of the filtered voltage signal to ensure that the pressure signal can be input into the single chip microcomputer; the output end of the voltage regulating circuit is electrically connected to the input end of the AD conversion circuit, and the AD conversion circuit is set so that the pressure signal can be read by the single chip microcomputer. The output end of the AD conversion circuit is electrically connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is electrically connected to the input end of the alarm circuit, the input end of the display unit, and the input end of the data transmission unit. The single-chip microcomputer processes and judges the output voltage signal. When the side pressure signal exceeds the predetermined value, it outputs an alarm instruction to the alarm circuit to alarm the current signal situation to remind the staff to take corresponding measures. The data transmission unit adopts a wireless data transmission method composed of a Mesh self-organizing network. The wireless data transmission methods include Bluetooth, 4G / 5G, and Zigbee. The output end of the data transmission unit is connected to the input end of the remote controller, which is convenient for the staff to further analyze the stress data of the cable.

[0016] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A power cable laying stress monitoring device, characterized in that: include: A pulley, an upper bearing, a lower bearing, a strain gauge, a Wheatstone bridge, an elastomer, a permanent magnet, a conductor rod, and a signal processing mechanism; the central axis of the pulley passes through the pulley and is covered with an elastomer on the outer surface, and permanent magnets with opposite magnetic properties are arranged at both ends of the inner part of the central axis outside the pulley; an upper bearing and a lower bearing are arranged on the outer surface of the elastomer; a strain gauge is arranged on the outer surface of the elastomer between the upper bearing and the lower bearing; the conductor rod is electrically connected to the Wheatstone bridge and the signal processing mechanism respectively, and the conductor rod cuts the magnetic field of the permanent magnet to generate an electromotive force and thus provides electric energy for the Wheatstone bridge and the signal processing mechanism; the strain gauge is electrically connected to the Wheatstone bridge; the output end of the Wheatstone bridge is electrically connected to the signal processing mechanism; the cable applies pressure to the pulley, and the pressure acts on the elastomer through the bearing, and the strain gauge arranged on the outer surface of the elastomer is deformed accordingly, so that the corresponding resistance of the strain gauge in the Wheatstone bridge changes, and the Wheatstone bridge converts the resistance change into a voltage change and outputs it to the signal processing mechanism.

2. The power cable laying stress monitoring device according to claim 1, characterized in that: The signal processing mechanism includes a voltage stabilizing circuit, a filtering circuit, a voltage regulating circuit, an AD conversion circuit, a single-chip microcomputer, an alarm circuit, a display unit, and a data transmission unit; the input end of the voltage stabilizing circuit is electrically connected to the output end of the Wheatstone bridge; the output end of the voltage stabilizing circuit is electrically connected to the input end of the filtering circuit; the output end of the filtering circuit is electrically connected to the output end of the voltage regulating circuit; the output end of the voltage regulating circuit is electrically connected to the input end of the AD conversion circuit; the output end of the AD conversion circuit is electrically connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is electrically connected to the input end of the alarm circuit, the input end of the display unit, and the input end of the data transmission unit, respectively, and the output end of the data transmission unit is connected to the input end of the remote controller.

3. The power cable laying stress monitoring device according to claim 2, characterized in that: The data transmission unit adopts a wireless data transmission method composed of a Mesh self-organizing network.

4. The power cable laying stress monitoring device according to claim 2, characterized in that: The wireless data transmission methods include Bluetooth, 4G / 5G, and Zigbee.

5. The power cable laying stress monitoring device according to claim 1, characterized in that: The strain gauges are symmetrically arranged along the central axis.

6. The power cable laying stress monitoring device according to claim 1, characterized in that: The strain gauge is arranged on the outer surface of the elastomer by means of an adhesive.

7. The power cable laying stress monitoring device according to claim 1, characterized in that: Permanent magnets with opposite magnetic properties are arranged at two ends of the central axis by welding.

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