Have an idea for an automatic safe disposal of icicles and snow from roofs with very low power consumption. 

And that's what I thought. It will not just presentation ideas, and a sort of diary of birth specific technical device. 

The basis idea is that you do not need to fight polutorametrovy mi drifts on the roof and mnogokilogrammo Vym chunks of ice, hanging over the heads of citizens, and eliminate the problem in the bud ... . Put the sensor controller weather conditions. (Approx. 200 USD). He reacts to the presence of real snow and ice formation. At the exit he had just 2 commands: - snow removal and (or) elimination of icicles. It is clear that during a snowfall, the snow from an inclined roof removed (mechanically) much easier and safer than later, when he skopitsya.To same applies sosulek.Pri primary ice formation on the edge of the roof, he is thin, fragile, and its grains are not dangerous when falling from any vysoty.Poetomu, blocks snow removal and (or) liquidation and icicles start to work immediately. Estimated power consumption of one cycle of the unit for cleaning icicles 0.0014 kWh and snowthrower 0.25 kWh. Loops can be set different. Say, 1 every 0.5 hours, or 1 every 15 minutes. It is easy to calculate that even at 15-minute cycles (4 times per hour) at 10-hour snowfall consumption will be only 10 kilowatt-hours elektroenergii.Ponyatno that such snowfalls are not every day ... 

 I know three very simple and cheap teh.resheniya sensor controller, responds only to the snowfall. When snowfall at the outlet is closed malotokovy contact. Principles: 

- Weigh-circuit pin. - Removal of portions of the snow probe, melting; 

- Accumulation - melting-soaking humidity sensor - removal of the closure pin .- melting. 

- Accumulation - photos of the pair (the reflection of white) - the closure pin .- Remove melting. There are sketches. 

... Today, 01/26/1911 collected within 3 hours of snowfall sensor on the first principle. Fortunately, the outside-perfect snow! 

 Microswitch is triggered by snow in 1930. Now you need to check the scheme together with the defrost. But this is the day after tomorrow ... 

 

... Well, everything works fine. The sensor is automatically exempt from the snow and ready to go after 10 ... 12 minutes after the snowfall. In this case, when hit by snow consumes the current from the 220V, 50 Hz, only 0.07 A. 

 The cost of the sensor is (retail price): 

- Galvanized iron (body) - 45 rubles; 

 -Stainless steel (frame) - 10 rubles; 

 -Resistor-0, 5 (frame) 3x10 -30 rub; 

 -PCB (frame, the inner support plate wiring) -10 rub; 

 -Pipe-square 20h20h40mm 2rub; 

 -Output terminals -10 rub; 

 -Micro - 15 rubles; 

- Wire installation -3 rubles; 

 Only 125 rubles. Materials. 

 + 100 rbl. Work locksmith 

 TOTAL: 222 rub. 

 Tomorrow, put it back into place long-term trials, on the edge of the roof and enter the work on the LED. 

 We turn to the principal: the unit automatically remove snow and icicles. 

 Block snow removal. 

As always, the technical solutions comes to my mind somewhat. Dwell on the lasso. 

Lasso removes snow in small quantities, it is convenient to circumvent bezopasno.Im structural elements and roof extensions. 

 Practically found that for satisfactory mechanical cleaning of the roof requires multiple number of moves lasso. Are invited to the formula: K = 1 +2 Ncos (a) / d; 

 where: K - calculates the number of strokes (rounded to an integer); 

 H - thickness of fresh snow depth (mm); 

 a - The angle of the plane of the roof to the horizon; 

 d - diameter of the rope lasso. 

 

 For example: 

 1. Vertical plane (adhering snow): cos (a) = 0 and K = 1 course; 

 2. The slope of the roof (a) = 60 °; rope d = 15 mm rainfall H = 150 mm, then: 

 K = 1 + 2 x 150 x 0,5 / 15 = 11 strokes; 

 3. Horizontal plane with the same initial data: 

 K = 1 + 2 x 150 x 1 / 15 = 22, stroke; 

Based on the above make up the terms of reference for designing and programming unit cleaning his work ... . 

 

Of the job. 

 

1. Efficiency of the device to-400C; 

2. Reliable protection from external influences (moisture, dust, insects, animals, etc.) 

3. Block snow removal should be composed of subunits and items weighing less than 10 kg; 

4. Installation and assembly of one - two installers; 

5. Mounting subunits must be reliable to withstand the impact of external forces, not less than 5000 N; 

6. Powered device or 220 V or 380 V, 50 Hz or 12 (depending on configuration); 

7. Power consumption not more than 1 kW; 

8. Processing area of the roof split into sections no more than 100 m2 

9. The work unit - is cyclic. One cycle should include a programmable number of moves, depending on the slope of the roof and the average snow cover in the locality; 

10. During one of the 1 ... 5 min; 

11. Working with the probe during a snowfall should be continuous until the end of the snowfall + programmatically set the number of moves. 

12. The device must fit with uninterrupted and redundant power supply voltage of a given class, in case of power failure the primary source. 

13. Maintenance devices - seasonally inspection. 

14. The service life of 10 years; 

 

... 30.01.1911 tried the idea of removing icicles Cable. Two five-second pulse and the result on the main photo. (The date on the camera is installed, so distorted)