In industrial automation production lines, high-frequency vibrations generated by the operation of CNC machine tools, stamping equipment, etc. can cause the galvanized u-shaped trough to become loose, the zinc layer to peel off, or even break, which not only affects the cable protection function, but may also cause safety hazards such as short circuits. For the seismic reinforcement of galvanized u-shaped troughs, it is necessary to combine the characteristics of the zinc layer with the cable trough structure, and formulate solutions from multiple dimensions such as foundation fixation, shock absorption and buffering, and structural reinforcement to ensure the stable operation of electrical lines.
The composite fixing method of "chemical anchor bolts + elastic gaskets" is adopted to enhance the connection strength between the cable trough and the building structure. The cable trough bracket is firmly anchored to the concrete or steel structure by chemical anchor bolts. Compared with ordinary expansion bolts, chemical anchor bolts can provide stronger pull-out resistance and shear resistance. EPDM rubber gaskets are installed at the contact point between the bracket and the cable trough to absorb vibration energy by using the elastic deformation of the rubber, while avoiding direct friction between the bracket and the galvanized layer to cause damage to the zinc layer. For vertically installed cable troughs, a set of fixed brackets is set every 1.2-1.5 meters, and support points are added every 2-2.5 meters in the horizontal direction to form a multi-point anchoring network to disperse vibration stress.
Spring shock absorbers and rubber shock pads are installed between the galvanized u-shaped trough and the bracket to build a multi-level shock absorption system. Spring shock absorbers are suitable for low-frequency and large-amplitude vibration scenarios, absorbing vibration energy through spring compression and rebound; rubber shock pads are for high-frequency vibrations, using their viscoelastic properties to effectively block the propagation of vibration waves. Inside the cable trough, lay a foamed silicone shock pad with a thickness of 5-8mm, wrap the cable and fill the gap in the cable trough, reduce the collision and friction between the cable and the trough wall, further reduce the impact of vibration on the cable and the cable trough, and extend the service life.
Use a thickened galvanized u-shaped trough to increase the trough wall thickness from the conventional 1.0mm to 1.5-2.0mm to enhance the overall rigidity. A double folding structure is designed on the edge of the trough body. The 90-degree folding process increases the moment of inertia of the section and improves the ability of the cable trough to resist bending deformation. For heavy-load areas, double or multi-combination cable troughs are used. Multiple cable troughs are spliced into a whole through high-strength galvanized connectors to improve the load-bearing capacity and seismic resistance. At the same time, the splicing is fully welded and repainted with anti-rust paint to ensure that the integrity of the zinc layer is not damaged.
Optimize the connection method of the cable trough and adopt a combination of anti-loosening nuts, spring washers and thread lockers. At the splicing of the cable trough, 8.8-grade high-strength bolts are used with double nuts for fixing. The inner nut applies pre-tightening force, and the outer nut prevents loosening through friction; anaerobic thread lockers are applied to the contact part between the nut and the bolt, and the thread gap is filled after curing to further prevent the nut from vibrating and loosening. For the cable trough cover, a quick-release snap-on connection is used. Compared with the traditional screw connection, it can not only achieve rapid maintenance, but also maintain a tight fit in a vibration environment to avoid safety accidents caused by the cover falling off.
When wiring in a galvanized u-shaped trough, reserve 10-15% cable slack to form an "S" or "Ω" bend to provide expansion space for the cable when it vibrates, preventing the joint from loosening or the cable insulation from being damaged due to pulling. Use nylon cable ties to fix the cables in sections every 30-50cm in the trough to reduce the amplitude of cable shaking. For troughs that span different vibration units, use metal braided hoses or corrugated rubber hoses to connect them, using their flexibility to absorb relative displacement, avoid stress concentration at the trough interface due to vibration, and ensure the continuity and safety of electrical lines.
The seismic reinforcement of galvanized u-shaped troughs in industrial automation production lines requires the comprehensive use of composite anchoring, shock absorbing devices, structural reinforcement, anti-loosening connections, and flexible wiring. By stabilizing the basic connection, attenuating vibration transmission, improving structural strength, preventing loose components, and adapting to displacement changes, it can not only give full play to the corrosion resistance of galvanized materials, but also effectively resist vibration shocks, building a solid electrical line protection barrier for the safe and stable operation of industrial automation production.
