AI Anti-Tailgating Security Door

An AI-powered, mechanically interlocked security door that verifies identity, detects 20+ tailgating behaviors, and physically blocks unauthorized entry — even during power or network failure.

Intelligent single-person passage verification for data centers, laboratories, financial facilities, industrial sites and other controlled entrances.

The Zhanjiang ZJ-I3 Series combines intelligent behavior detection, multi-zone infrared monitoring and physical A/B door interlocking to reduce unauthorized following, credential sharing and multi-person passage under a single authorization.

Three security configurations are available to meet different site risks, authentication requirements and physical protection needs.

A1 / AA / AAA Security Levels
Up to 15 Tailgating Detection Modes
48-Pair Infrared Detection
A/B Door Interlocking
Multi-Modal Authentication
Custom Project Configuration

Traditional Access Control VS AI Anti‑Tailgating Interlocking Portal

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Item	Traditional Access Control System	Our AI Anti‑Tailgating Interlocking Portal
Verification Logic	Only verify card / QR / biometric credential, cannot confirm actual passing‑through person quantity	Verify credential + real‑time passage behavior detection, confirm how many persons pass through
Tailgating Risk	Vulnerable to piggybacking, close‑following, side‑by‑entry; infrared / weight sensors can be tricked easily	AI‑powered detection blocks piggybacking, close‑following and object‑concealment tailgating behaviors
Borrowed / Stolen Card	Cannot identify person, borrowed or stolen access cards can pass validation normally	Combined interlocking portal prevents unauthorized entry even with valid borrowed cards
Working Mechanism	Open gate once credential is valid, no secondary passage check	Dual‑door interlocking: exit‑side door unlocks only after full detection & verification process completed
Abnormal Alarm	No dedicated anti‑tailgating alarm trigger	Lock secure‑side door, trigger local alarm & output event signal to security platform for abnormal passage
Audit Trail	Only record credential ID, no real‑person passing record	Complete end‑to‑end audit trails for every access event

Key Security Functions

Physical A/B door interlocking
Single-person passage verification
Tailgating and abnormal-passage detection
Credential-holder consistency verification
Configurable alarm and interception logic
Offline execution of predefined access rules
Fire-alarm and emergency-release integration
Passage status and alarm signal output
Optional silent duress-alarm configuration
Third-party access-control integration

Choose the Right Security Level for ZJ‑I3 Interlocking Security Door

The ZJ‑I3 Series is available in three configurations. Model selection should be based on the site's security risk, required detection coverage, physical protection needs and authentication method.

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Feature	ZJ‑I3‑2000	ZJ‑I3‑2200	ZJ‑I3‑3200
Security level	A1	AA	AAA
Product positioning	Standard Security	Advanced Security	Maximum Security
Tailgating warning and detection modes	2 modes	15 modes	15 modes
Recommended risk level	Medium	High	High
Primary objective	Reduce tailgating risk	Comprehensive tailgating detection and prevention	Comprehensive detection with enhanced physical protection
A/B door interlocking	Yes	Yes	Yes
Multi‑modal authentication	Configurable	Configurable	Configurable
Access‑control integration	Configurable	Configurable	Configurable
Custom dimensions and finish	Available	Available	Available

How the Anti-Tailgating Door Works

Every passage is verified in three stages -identity, behavior, and physical isolation. No credential, no person, no
exception.

Step 1 – Verify Identity
The user presents a credential (face,
fingerprint, IC card, or dynamic
password). Credentials are bound to the
cardholder; a borrowed card fails
authentication immediately.

Step 2-Analyze Behavior
Inside the compartment, Al vision,
millimeter-wave radar, and dynamic
weight-curve analysis track the passage
in real time, detecting overlapping bodies,
concealed persons, or abnormal postures
in milliseconds.

Step 3 – Enforce Physically
A/B door interlocking means only one
door can open at a time. Even if detection
is challenged, the mechanical interlock
physically isolates the lane until the
passage is verified complete.

20+ Tailgating Behaviors Detected & Blocked

Unlike fixed-sensor turnstiles, the ZJ-I3 anti-tailgate gate uses self-learning intelligent sensing to continuously identify abnormal passage behavior. Every pattern below triggers instant interception — eliminating security loopholes ordinary gates miss.

Identity & Piggybacking

Detects borrowed cards, shared credentials, physical overlap piggybacking and hidden creeping in real time.

Evasion & Anomaly

Recognizes jumping, crawling, hanging postures, abnormal visitor tracks and A/B door person‑switching.

Instant Interception

Self‑learning AI triggers alarm and physical interception immediately, no blind spots, no delay.

Built for Worst‑Case Scenarios

Power / Network Failure

No‑source locking keeps the door securely locked with zero power. A reserve battery supports 100 passage cycles , and the system continues enforcing preset permission rules fully offline.

Fire & Emergency Evacuation

The door links directly to fire alarm signals and releases access control automatically in an emergency. Frameless breakable glass opens a compliant escape route wider than 800 mm.

Hijacking / Coercion

A one‑touch silent alarm instantly locks surrounding zones. An intelligent time‑out lock strategy plus dual‑lock physical isolation minimizes the risk of unauthorized exit.

Vandalism & Forced Entry

Military‑grade construction withstands sustained physical impact for over 15 minutes . The integrated high‑strength frame resists prying and forced opening.

Contact us to design a free solution

Technical Specifications

Model Series

ZJ‑I3

Passage Mode

A/B door interlocking (one door open at a time, absolute interlock)

Recognition Methods

Face recognition · Fingerprint · IC card · Dynamic password (multimodal, combinable)

Tailgating Detection

AI deep learning + millimeter‑wave radar + 48‑pair infrared (4 optical screens, detection range ≤ 20 mm) + dynamic weight‑curve analysis

Response Time

< 2 s recognition

Throughput

High‑frequency mode: ~2 s per passage cycle — up to 30 persons/min per lane · Full‑verification mode: 10–15 s per passage cycle (multi‑factor identity + behavior checks)

Main Frame

304# stainless steel, 2 mm thick; locally reinforced plates ≥ 1.0 mm

Glass

8 mm tempered safety glass (custom colors/finishes available)

Floor

Anti‑slip rubber mat with stainless steel base

Passage Width

From 600 mm

Overall Width / Height

From 1100 mm / up to 2400 mm

Power Supply

AC 220 V, 50/60 Hz; rated 200 W · Logic voltage 24 V DC

Backup

Reserve battery for 100 passage cycles

Operating Temperature

-20 °C to +45 °C

Storage Temperature

-34 °C to +71 °C

Humidity

0–90% RH, non‑condensing

Weight

320–520 kg depending on configuration

More Installation Project

Security Interlock Door vs. Revolving Door vs. Optical Turnstile

Dimension	Security Interlock Door (DS‑I3)	Security Revolving Door	Optical Turnstile
Tailgating Detection	AI + radar + weight curve, 20+ behaviors	Fixed sensor count	Optical zone only
Identity Verification	Multimodal, person‑to‑card binding	Card only	Card only
Power‑Failure Behavior	Mechanically locked + battery reserve	UPS (30 min typical)	Fails open / free passage
Physical Isolation	Yes (A/B interlock)	Partial	No
Footprint	~1.1 m width	~1.7–1.9 m diameter	Compact
Throughput	Configurable: 2 s/cycle (high‑frequency) to 10–15 s (full verification)	High	Highest
Best For	Data centers, vaults, labs, restricted zones	Unmanned lobby flow	General employee flow

Frequently Asked Questions

What is an anti‑tailgating door?

An anti‑tailgating door (also called a security interlock door or mantrap door) is a two‑door passage where only one door can open at a time. Each passage is verified by identity and behavior checks, so only one authorized person can pass per cycle. It is designed for high‑security entrances such as data centers, banks, laboratories, and government facilities.

How does it detect tailgating and piggybacking?

The ZJ‑I3 combines AI deep‑learning vision, millimeter‑wave radar, and dynamic weight‑curve analysis with 48 infrared beams. Together these detect overlapping bodies, concealed persons, and abnormal postures — covering 20+ known tailgating patterns including borrowed cards, back‑carry, side‑by‑side walking, and hiding behind objects.

What happens during a power failure?

A no‑source mechanical lock keeps the door securely locked with no power required. A reserve battery supports approximately 100 passage cycles, and preset permission rules keep operating fully offline during network outages.

How fast is passage through the door?

Throughput is configurable. In high‑frequency mode, a passage cycle takes about 2 seconds — up to 30 persons per minute per lane. In full‑verification mode with multi‑factor identity and behavior checks, a cycle takes approximately 10–15 seconds. You choose the mode per entrance, and both can run on the same unit. For entrances that need continuous high flow instead of verified high security, we recommend combining with our speed lane turnstiles.

Does it integrate with my existing access control system?

Yes. The ZJ‑I3 supports Wiegand 26/34‑bit, RS232, relay (dry contact) outputs, and standard digital I/O. It integrates with virtually any access control, visitor management, or security platform — including fire alarm systems for automatic emergency release.

Is it compliant with fire and emergency codes?

Yes. The door links directly to fire alarm signals and automatically releases access control in an emergency. Frameless breakable glass provides an escape route wider than 800 mm, and manual mechanical release prevents entrapment.

How much does an anti‑tailgating door cost?

Cost depends on model, authentication options, and site conditions. ZJ‑I3 units are competitively priced for the security level delivered — typically a fraction of imported equivalents — and pay back through reduced security staffing and energy savings. Contact us for a site‑specific quotation.

What warranty and support do you offer?

Every ZJ‑I3 comes with a 5‑year free warranty including at least two free inspections per year, a 10–15 year service life, and direct factory technical support. Customization for site conditions is available.

Do you offer international installation support?

Our technical team provides remote commissioning guidance, installation manuals, and on‑site supervision options for international projects. Most installations follow a standardized deployment guide that minimizes on‑site time.

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