Large Architectural Clocks, Bell Tower, Kexin Aluminum Plate Electrostatic Powder Coated Clock Face, Design Life of 50 Years

Kexin Architectural Tower Clock Product Structure:                                                                           

Clock systems are divided into indoor and outdoor sections.Among them, the indoor section is further divided into master clock systems and PC monitoring sections.

The exterior consists of the sub-dial section, which can be further divided into movements, hands, scales, and lighting systems, etc.

● Principle Introduction

The master clock has its own clock circuit, generating second signals, with an accuracy of0.04 seconds/day, while the CPU continuously receives time signals from the GPS signal station and corrects its own time signals, ensuring the accuracy of its time signal.

The master clock continuously sends time signals to the slave clocks, as the slave clocks accumulate time.At 15 seconds, the output drive signal activates the motor, completing the timing operation.

The subordinate clock transmits its status back to the master clock and accepts its monitoring. Meanwhile, the subordinate clock's timekeeping is also monitored by a feedback switch, ensuring the entire subordinate clock forms a closed-loop system. The master clock and subordinate clock together constitute a larger closed-loop system, thus guaranteeing the entire system's accuracy.

● Master Clock Section:

a）Control System: The master clock is the control center of the system, issuing various control commands and signals from the master clock to regulate the entire system's operation.

The master clock has a clock system, with its timing accuracy being that of the system. When the system is powered, the system's timing accuracy is0.04 seconds/day, the internal timer of the system can maintain operation for more than 10 years during power failure.

The master clock controls the running time of the slave clocks. During system installation, it is necessary to adjust the time of the slave clocks on the master clock.The CPU determines whether the subordinate clocks are running normally, speeding up forward, or speeding up backward based on the time of the subordinate and master clocks. If the system loses power at any time, the master clock can remember the time of each subordinate clock. When the system is powered on again, the master clock continues to run based on the remembered subordinate clock times. The main control cabinet requires 9 wires to control the running of each subordinate clock, with 6 wires being motor drive lines and 3 being core feedback lines.

b）Cabinet: The master clock is housed in a tower clock-specific outdoor waterproof cabinet, height1200mm in size, featuring an internal power supply and lock, all front, back, and side panels are removable. Surface undergoes washing, phosphatization, and hot galvanizing treatments prior to painting. The outer surface meets the national standard grade 2, while the inner surface meets grade 4. Spray...The surface is matte finished with even coloration. The flatness of the surface does not exceed within a 1 square meter area.1mm thickness, free from wrinkles, cracks, burrs, and welding marks at the surface corners, the gap between the door and frame is less than 1.5mm, all side gaps feature waterproof design, the door opens smoothly with no jamming.

●Sub-chime section:

1、Mechanical Actuator：

a、Casing Appearance: The core shaft is electroplated, and the casing is sprayed with plastic; the core is fully enclosed, oil-free, corrosion-resistant, moisture-proof, shockproof, low noise, low wear, and has a long service life.

b、Casing Structure: Our tower clocks are driven using a constant current chopper method.

1) The motor shaft and worm shaft are rigidly connected, making it easy to ensure the concentricity of the two shafts.

2) The primary stage utilizes a worm gear spoke structure, rapidly reducing the transmission ratio. This results in a simpler and more compact design, transforming the originally complex core variable speed structure into a very simple miniature reducer, making it easier to ensure quality.

3) Revolutionize traditional connection methods for a compact, rational design, ensuring core operation is both smooth and reliable.

4) This core is particularly well-suited for constant current chopper circuit designs, ideal for constant current chopper drive methods.

2、Electrical control section:

a、Time Signal: Strike ClockThe CPU (AT89C51) receives the standard time signal from the master clock once per second, then compares it with its own running time to determine its operation (normal running, chasing, reversing, waiting).

b、Wrist Time Monitoring: Add a feedback switch on the movement axis to introduce another closed-loop control, which constantly feeds back the position of the hour hand to the sub-clock.CPU, the sub-CPU compares the timing based on its internal memory (theoretical timing position) with the feedback signal from the switch (actual timing position), thereby adjusting the position of the clock hand in real-time to ensure accurate timing.

c、Drive Circuit: Utilizes a constant current chopper drive method, incorporates closed-loop control to ensure constant current, and guarantees smooth motor operation without stalling, with low power consumption (only one-third of the power consumption of constant voltage drive)1/6), precise timing. Principle as follows:

Sub-clockThe CPU sends control signals to the drive circuit at a frequency of 15kHz. It latches the drive signal from the CPU on the rising edge of the signal. When the drive signal is low, it activates the drive to move the stepper motor one step. At this point, the feedback resistor in the circuit constantly monitors the current. When it reaches a certain level, the feedback signal opens the feedback loop, shutting down the drive circuit, causing the current to drop. When the current falls to a certain level, the feedback loop closes, and the drive loop opens, repeating this cycle to ensure a constant current throughout the drive circuit.

3、Lighting section

a、Lighting Range: 24 hoursLighting can be set at any time within 24 hours; the factory default is from 5 PM to 6 AM the following morning.

b、Luminescent Body: During external illumination, the luminescent body is used with a diameter of5mm LED in red, green, and yellow colors, with a typical brightness of 600mcd, wavelengths of 640nm red/525nm green, and a lifespan exceeding 100,000 hours; during internal lighting, the light source uses Philips cool light tubes, providing soft and even illumination, suitable for continuous lighting for several years.

c、Lighting Power Supply: For24V AC power supply.

Factory trial run:

Partial Cases: