Layout “electrocautery” is simple: the base is attached to the motor, firmly sandwiched between the main and removable walls of the casing, with the cutting working body (with a knife) at the end of the shaft. The desired height of stubble, avoiding touching the ground or hummocks and relatively easy movement provided with a height adjustment of the Central and two side runners. The direction of movement of an operator through the hinge connected to the base of the handle.
For greater security, and to create the optimal mode of operation of the motor the mower is powered through an isolating transformer with solid state full-wave rectifier (bridge) in the secondary winding. And made this site as a separate unit, easily connected with all other parts of the structure.
Now about the other features of homemade electrocasnice. And first of all about the Foundation. Cut from 3 mm sheet aluminum alloy AK4-1, it not only carries the actuator with a knife, but at the same time is part of the cutting apparatus. Due to the “angled” guides and their radial configuration, the base provides for the formation of sepekov of grass, feeding them under the knife and then move the crop to the side.
Unlike industrial lawn mowers in the proposed design of the mowed mass is not cut multiple times, increasing the burden on the knife and the electric motor, and the moving directional flow.
Grass srazhatsya to the ground. But if you want to mow you can with inches, gradually lowering to the roots base. To do so, when the grass want to grind (for example, a decorative lawn cutting).
The node of the actuator consists, as already emphasized, the electric motor, sandwiched between the notched walls of the casing, which together with brackets of aluminium alloy to create a secure attachment, the required stiffness and dissipate heat well from the heating during operation of the stator. The motor is firmly fixed in the desired position using the lugs on the stator (2 mm on each side), which are included in the construction window available in the walls of the casing and sealed from the inside (to protect from contact of the brush assemblies with metal casing) pieces of varnished cloth.
On the lower end of the motor shaft there is mounted a head (only turning detail), on which top is attached to the impeller fan, and the bottom knife of the mower. The air for cooling sucked through the gap between the lid and the walls. The airflow comes from the top down, preventing the same hit on performance parts lawn mower dust from the soil.
Rigidity of fixing of a knife in the head is achieved
aid of a clamping disc and two screws with washers, and through careful balancing, for which there is a special hole with a diameter of 4 mm. by Inserting a pin there, you can check the balance of the shoulders. The imbalance is eliminated by removing the excess weight of the knife on an emery wheel.
Power to the motor is fed through a damper-isolator of cut PVC tubing protects the cord from abrasion at the point of passage through the wall of the casing, and two hair ties. Similar bandages, by the way, there are on the handle of the mower. Winding is done in two layers with subsequent gluing BF-6. As the arm is slightly modified trapazoid “Idlers”.
Power supply unit made in the form of a single compact device. In the secondary winding of a separation transformer — rectifier diodes type Д226Д. Included in single-phase network with voltage of 220 V, the unit provides for the motor mower is constant (or rather pulsating) current, providing an optimal mode of operation of the actuator, which reduces the sparking at the collector circuit decreases the likelihood of overheating that node, and thus increases the operational reliability of the mower.
Transformer taken from domestic radio equipment with a power consumption of 90 In A, but with a slight revision. Package of iron (Ш40х70 mm) and the primary winding of the three sections (155 + 28 + 155 = 338 turns of wire PEL of 0.47) was the same as the frame, the rest is removed. Wound a new secondary winding 340 turns of the same PEL-0,47.
The modified transformer is installed at the bottom of the box-shaped housing from sheet PCB with the ribs of the aluminum area of 15×15 mm.
Above the transformer is the special Stockach attached circuit Board with a rectifier and fuse with an amperage of 0.5 A. the same fuse provided in the primary (network) winding, but they are located in the special block (household radio) on one of the side walls of the housing of the power supply unit. And next to another socket to connect the motor of the mower.
The connecting wires on the circuit Board copper flexible electrical residential section of at least 0.5 mm2 in the mild isolation. Soldering is performed with solder POS-40.
Removable cover the unit casing is fixed by screws M3. In the side walls of the ventilation ducts with a diameter of 10 mm. but for serves as a convenient carrying handle.
Electrocore reliable and comfortable in her care. “Whims”, and even more issues with the design have not yet been observed. And if they — “electrocautery” can be quickly disassembled and access almost any of its site.
Circuit diagram homemade electrocasnice
Portable garden electrocore:
1 — side snake (STZ, rod with M5 thread and nuts on the ends, 2 PCs); 2 — knife (U7A steel, hardened to HRC 50…55, blueing); 3 —short guide rail (aluminum corner 15×15, 9 items); 4 — base (AK4-1, sheet s); 5 — Central snake (STZ. rod with M5 thread and nuts on the ends); 6 — the node of the actuator Assembly; 7,15 — socket; 8 — the clamp (AMC, sheet s2); 9,14 — two conductor cable in PVC insulation; 10 — spacer (aluminum 15×15 area); II switches; 12 — string jockstrap; 13 — fuse socket; 16 — unit power supply; 17 — wood handle (mount — steel stud M5); 18 — the cord with the plug; 19 — arm (from Trapezaki “Lazy”); 20 — bracket (STZ, 2); 21 — stud М4х170; 22 — nut M4 (4 PCs); 23 —long guide rail (aluminum 15×15 area); 24 — printed circuit Board (Д226Д diodes and fuses 0.5 A); 25 — transformer; 26 — clip-coupling (AMC, 2 PCs.)
The motor Assembly complete with knife:
1 — knife; 2 — head (45 steel); 3 — impeller fan (STZ, sheet s0,3); 4 — long guide; 5 — bolt M4 (8 pieces); 6 — nut M4 (16 items); 7 — base; 8 — main bracket (AMC, sheet 1.5); 9 — cable; 10 — damper-isolator (tube of PVC. L50); 11 — cap (tin can); 12 — filament bandage (2 PCs); 13 — the main wall of the casing (AMC, sheet s1.5); 14 — M4 screw (2 pieces); 15 — spacer (AMC, riveting of the two strips s1,5, 2); 16 — removable wall of the casing (AMC, sheet, 1.5); 17 — collector series motor (a vacuum cleaner “Breeze-3”); 18 — additional bracket (“mirror” performed by the children. 8); 19 — short track (9 pieces); 20 — M3 screw (2 PCs); 21 — retaining plate (STZ, sheet s3); 22 — screw M4 split washer (2 hornless ); 23 — self-contradanza nut M4; 24 — screw M2,5 (2 PCs); 25 — the dust (the varnished cloth, 2 PCs.)
For example, the sequence of actions when changing the electric motor to drive the mower. Unscrewing the two fastening screws M4, remove the cover. Release the removable wall of the casing. To do this, Unscrew the screws that connect it with the base and with the main wall. From the slot-the slot in the latter is removed the damper-isolator with cord. And finally, removing the knife head, remove the motor.
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