Factory Driving Remote Control Production

A small crane commonly used in factory workshops, installed on an I-beam. The electric motor drives the wire rope through a speed reduction mechanism to pull the hook up and down to lift heavy objects. Under the traction of the motor, it can move left and right, forward and backward.

The crane control method is to lead out a multi-core cable from the electric control box installed on the crane, and then connect it to an operation button box, and control the lifting, lowering, front and back, left and right travel or the power on and off through six or eight buttons.

When the crane is moving, the operator has to hold the button box, stare at the heavy object, and follow the crane, which is very inconvenient. The author uses a remote control device equipped with BA5104/5204 components to effectively solve this problem. This article is made for 5t cranes.

How the Circuit Works

It consists of two circuits, the transmitting circuit and the receiving circuit. The transmitting circuit (as shown in Figure 1) uses the LN70 series of BA5104 (IC1) special coding rate type, and VD2 uses the PN303 photodiode with a wavelength close to it. VD1 and VD2 should be installed in a black plastic block with two holes drilled. It can also be used to bond two small metal tubes in parallel, and then put a photosensitive element in each tube, as shown in Figure 5.

The debugging workload of the circuit itself is very small. After installation, generally only the sensitivity adjustment is required. At the beginning, do not install the infrared transmitting and receiving tubes together. After installing the circuit, pull VD1 and VD2 about 2 meters apart and adjust RP2 to the minimum. Adjust RP1 to make IClIC. Pins ① and ② of ICl are the customer code selection terminals. These two terminals are required to be suspended or grounded in correspondence with the (11) and (12) pins of the BA5204 (IC2) decoding IC of the receiving circuit.

Pins (12) and (13) of IC1 are connected to a 455kHz ceramic crystal oscillator. Pins ③ to ⑦ and pins 9 to 10 are connected to 8 control buttons. Pressing a key will change the level of the corresponding pin of IC2. See the attached table for the corresponding relationship.

Pin (14) is the transmitting indication terminal. The coded signal is output from pin (15), amplified by the composite tube composed of 2V1 and 2V2, and then transformed into a light signal by the 2VD2 infrared transmitting tube and transmitted. The principle of the remote control receiving circuit is shown in Figure 2. The operating voltage of IC2 is 5V.

Pin (13) is the internal oscillator timing terminal, which is connected to the R4 and C1 network; pins ③ to ⑩ are control output terminals. The 6 ports of pins ③ to ⑧ are non-holding terminals. Here, pins ③ and ④ are the lifting and lowering signal terminals, and pins (5) and ⑥ are the front and rear travel signal terminals. Pins ⑦ and ⑧ are the left and right travel signal terminals, and pin 9 is the start/stop holding terminal. The front and rear and left and right travel motor power connection terminals are set to control the corresponding normally open contacts respectively to realize power on and off control.

The infrared receiving head (three terminals) of IC3 circuit receives, amplifies and demodulates the signal, and restores the infrared signal sent by the remote control into a pulse code that can be recognized by the decoding BA5204. The signals output by pins (3) to (9) of BA5204 are amplified by transistors V2 to V8 respectively, and drive the corresponding relays to realize the control function.

Infrared control integrated circuit BA5.104, 3V power supply, 2V1 uses 9013, 2V2 uses 80500 infrared control integrated circuit BA5204, 5V power supply.

Vl~V8 use 9013, rectifier diodes VDl~VD4 use 1N4001, VD5-VDl2 use lN4148. Power transformer B uses XDT type AC 220V signal lamp transformer.

Relays K1~K7 use ultra-small medium-power electromagnetic relays JZC-ZZF type, with a pull-in voltage of 12 V. KM1~KM7 need to be selected according to actual conditions.

The electrical control part of the motor is original, and the original button box and cable are not removed, so manual and remote control can be realized. This circuit is applied to a 5t crane and the effect is very good. If the crane has a large lifting weight, an intermediate relay should be added.

Relationship between control keys and BA5204 pins