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Tripod turnstile, also called waist high turnstile or tripod barrier turnstile gate, is a straightforward, affordable, and small waist-high access control turnstile with three rotating arms. It includes a chassis, a mechanism, and three blocking rods, offering automated access control that is dissuasive for heavily used areas. The automatic turnstile barrier uses precise movement position control to ensure that it operates more accurately and steadily. It is made of stainless steel in a contemporary form, offering a safe, stylish, and fashionable option for both indoor and outdoor applications. As an ideal crowd control solution for any location that needs effective crowd management, tripod turnstile barrier gate, on the other hand, simplify integration to access control and visitor management systems, and slows down pedestrian traffic flow to enable closer monitoring of entry by security guards.

Tripod turnstile entry gate comprises three equiangular distances spaced barrier arms on a rotatable arm carrier which by means of a remote control barrier device can be prevented or permitted, respectively, to turn in at least one turning direction. Adjacent the arm carrier there is also a control disk with a track formation extending around its periferi with recesses between triangular cam means, spring-biased positioning means can be derolled in said track formation and against said cam means in order always to keep one of the barrier arms oriented in its home position, i.e. in a horizontal locking position. The tripod gate barrier is normally in a closed stage meaning that a solenoid holds the mechanism for a turnstile in the home position of the barrier arms.

The tripod access control gate comes with the locking function of which is normally disconnected meaning that the locking of the barrier arms of the turnstile when in the home position is mechanically released also in the absence of an admittance of a accepted signal (stand by). When signal is accepted or approved, only a sensor system and the electronic equipment will check that the passage has taken place and that the turnstile, with the aid of for example a spring and/or hydraulics, will assume the next home position.

Thanks to the fact that the mechanical locking function for the turnstile is disconnected in the home positions of the automatic tripod gate system the current consumption is lower than when, in the normal way, the solenoids are kept activated, as is the case in prior art turnstile installations. In addition to the reduced current consumption there is achieved a significant increase of the useful life of the product according to the present invention. If desired, the barrier arms of the tripod barrier turnstile can be tiltable when in their home positions, so that, e.g. at a fire alarm, the locking arm is released to fall down from its horizontal position to a vertical evacuation position. In this type of design a solenoid is activated, e.g.

Infrared sensor
The principle of infrared sensor is to use infrared light-emitting diodes to receive and convert the infrared light emitted by the object into an electrical signal, because the wavelength of the infrared light emitted by the object is generally between 10 and 100 microns, which makes these light can not be directly received. However, when the object passes through the infrared sensor at a certain speed, because the surface of the object will emit a certain wavelength of infrared light, and the infrared wavelength is much longer than the visible wave length, when the infrared emitted by the surface of the object will be received by the photoelectric device when the detector is converted into an electrical signal.

Photoelectric sensor
Photoelectric sensor is a kind of sensor that converts optical signal into electrical signal by using the principle of photoelectric effect. It is composed of two parts: a photosensitive element and an electric sensitive element. The photosensitive element is composed of a photoresistor and a photodiode. When the light source irradiates, the photoresistor deforms and the resistance value of the electric resistor changes. When there is no light source, the photoresistor does not change. The resistance change of a photoresistor is converted into an electrical signal by photoelectric conversion.
The function of photoelectric sensor in tripod turnstile gate is mainly to detect whether the brake rod rotates or pulls out to control the opening and closing of the brake. The detection method is: when the light shines on the photoelectric sensor, its level changes, it sends the change signal to the tripod turnstile gate control system, after analysis and processing, the output switching signal controls the opening and closing of the tripod turnstile gate.

Approach the sensor
The proximity sensor in the tripod turnstile gate is a highly sensitive sensor that is mainly used to detect metallic substances and give an output signal. The proximity sensor mainly plays a limiting role in the tripod turnstile gate. The movement of the tripod turnstile gate is a metal disc with three recessed sections close to the side of the sensor-mounted movement. When the pedestrian passes through the three-roll gate normally, the gate rod moves outward to drive the movement to rotate. At this time, the state of the gate can be judged by detecting the position of the movement, so as to control the switching state of the gate. A person through the three roller gate will drive the movement to rotate a week, the proximity sensor detects the movement will output a locking signal, waiting for the next door signal appears before the gate will work normally. This can effectively prevent the phenomenon of missing detection caused by pedestrian following.

Magnetic induction sensor
Magnetic induction sensor is to convert the external magnetic field changes into electrical signals, and output signals after processing by electronic circuits. It can detect the change of the magnetic field, and calculate the rotation Angle of the axis through a certain algorithm, so as to calculate the opening or closing time, when the opening or closing of the gate, can effectively control pedestrian traffic.