Smart Shelf Safety Inspection Solution

Industry Landscape

In logistics facilities, shelving units are typically tall, densely packed with heavy inventory, and require year-round real-time tilt monitoring to achieve the following objectives:

Prevent Shelf Collapse and Ensure Personnel and Cargo Safety

Structural Stability Monitoring: Shelf tilting can result from foundation settlement, overloading, forklift collisions, or long-term uneven stress distribution. If left unaddressed, this may lead to catastrophic collapse.

Early Warning: Minor tilts are often imperceptible to the naked eye; however, utilizing tilt sensors or regular inspections enables early detection of potential hazards, preventing disastrous outcomes.

Prevent Cargo Sliding or Damage

Center-of-Gravity Balance: Tilted shelves cause cargo to shift off-center—particularly on high-level racks or with heavy loads—significantly increasing the risk of sliding, toppling, cargo damage, and even personnel injury.

Specialized Cargo Protection: Precision instruments and fragile goods (e.g., glass, electronics) demand higher shelf levelness; even slight tilting can result in packaging damage or product defects.

Compatibility with Automated Storage Systems (e.g., AGVs/Stacker Cranes)

Precision Positioning Requirements: Automated warehouses rely on standardized rack alignment. If tilt exceeds permissible limits (e.g., ±0.5°), stacker cranes may fail to retrieve goods or risk collision.

System Integration: Real-time tilt data can be fed back to the Warehouse Management System (WMS) to automatically adjust robotic pathways or suspend operations in hazardous zones.

Compliance with Safety Regulations and Industry Standards

Legal Requirements:Standards such as OSHA (Occupational Safety and Health Administration) and GB/T Code for Use of Storage Shelves mandate regular structural inspections; racks exceeding tilt thresholds must be taken offline for repair.

Insurance and Liability: Some insurers require the installation of tilt monitoring devices; otherwise, claims may be denied following an incident.

Reduce Maintenance Costs and Extend Rack Lifespan

Preventive Maintenance: Monitoring tilt variations helps determine the need for footing reinforcement, beam adjustment, or replacement of damaged components, preventing minor issues from escalating into major repairs.

Minimize Downtime Losses: Sudden collapses can halt warehouse operations, whereas routine inspections maximize operational continuity.

Shelf tilt monitoring is a low-cost, high-return safety measure in logistics warehouse management, and it is particularly critical for high-bay racks, automated warehouses, or high-frequency operational environments. Leveraging IoT technology, our company has developed an unmanned shelf tilt monitoring system that significantly reduces accident risks and ensures the stable operation of storage systems through continuous IoT-based inspection.

 Tilt Monitoring System

Overall System Function

Tilt detection requires a complete system to ensure the usability of the data. Our company has developed a full-fledged tilt monitoring system comprising front-end tilt sensors, wireless transmission modules, alarm terminals, a mobile app, and a cloud platform. The following sections will introduce the wireless transmission modules, alarm terminals, cloud platform, and tilt sensors respectively. Below is the system architecture diagram.

The entire system operates as follows: 

One tilt sensor is installed on each shelf, powered either by battery or via constant power supply. 

Data transmission supports LoRa, LoRaWAN, or Wi-Fi. A display terminal is placed at the front of each rack group to visually indicate the tilt status of that specific group.

Wireless Transmission

This system employs three wireless transmission technologies: LoRa/LoRaWAN, Wi-Fi, and Cat1 (4G). Each is tailored to distinct deployment scenarios. LoRa/LoRaWAN is suited for large-scale localized environments—such as logistics shelving—where sensors require low power consumption, long-range transmission, and centralized management. Wi-Fi is ideal for settings with existing Wi-Fi coverage and no stringent power constraints. Cat1 (4G) targets highly dispersed, expansive environments, such as communication towers or structurally compromised buildings. These three wireless technologies are briefly introduced below.

Cloud Platform

Platform Overview

This IoT platform is a comprehensive management system designed specifically for wireless tilt sensors. It supports device access via Wi-Fi, LoRa/LoRaWAN, and Cat1 communication protocols, enabling unified monitoring, data management, and intelligent early warning for various types of tilt sensors.

 Core Functions

• Multi-Protocol Device Access

Supports access for tilt sensors using Wi-Fi, LoRa/LoRaWAN, Cat1, and other communication protocols

Automatic identification of device type and communication protocol

Provides standardized device access interfaces

• Real-Time Data Monitoring

Receives and parses tilt angle data reported by sensors (X/Y/Z axes)

Real-time display of device status and tilt data

Provides 2D/3D visualization interfaces

Supports historical data query and playback

• Intelligent Alarm Management

Configurable multi-level tilt alarm thresholds

Supports multiple notification methods including SMS, email, and APP push

Hierarchical alarm processing mechanism

Alarm record storage and query

• Full Lifecycle Device Management

Device registration, configuration, and group management

Device status monitoring (online/offline)

Remote parameter configuration and firmware upgrades

Device maintenance record management

• Data Analysis & Reporting

Tilt trend analysis

Device health assessment

Custom report generation

Data export functionality

Technical Features

• Multi-Protocol Support

Wi-Fi devices: Access via MQTT/HTTP protocols

LoRaWAN devices: Access via LoRa gateway

Cat1 devices: Access via cellular network

• High-Reliability Design

Encrypted data transmission

Offline caching mechanism

Load balancing design

• Flexible Deployment Options

Supports cloud deployment and on-premises deployment

Provides standard API interfaces

 User Value

Unified Management: Centralized management platform for devices using multiple communication protocols

Real-Time Early Warning: Timely detection of safety hazards to prevent accidents

Cost Reduction: Reduces manual inspection costs and improves management efficiency

Decision Support: Data-driven device health assessment

System Architecture

Device Layer: Various wireless tilt sensors

Communication Layer: Wi-Fi/LoRaWAN/Cat1 networks

Platform Layer: Data reception, processing, storage, and analysis

Application Layer: Web management portal, mobile APP, API interfaces

Tilt Sensor

The HYS07 tilt sensor features high precision, low power consumption, and strong stability. It monitors the tilt status of objects in real time and reports data to the cloud platform via LoRa/LoRaWAN/Cat1/Wi-Fi networks, enabling remote monitoring and management. Encased in a metal housing and equipped with a high-capacity battery (with optional external power supply), this sensor includes intelligent alarm functionality and supports multiple protocols including TCP, UDP, and MQTT. With a built-in SD card, it supports automatic data retransmission during network outages. It is widely applicable across industries such as building construction, geological exploration, tower monitoring, smart cities, and industrial automation.

Alarm Terminal

The alarm terminal enables centralized management of multiple tilt sensors and can simultaneously display data from multiple sensors on a single screen.