Find two disposable plastic cups, stick them together mouth to mouth with scotch tape, cut off the bottom of the cups, drill a circle of holes in the cups and pour some water into them. At this time, there will be several staggered rows of water. If you want more exercise, install a small flashlight on the cup and shine it on the fountain, which is very attractive. Try it if you don't believe me.
The dog body of the robot dog is a square tube with a grooved plate, and the lower part is cut off, as shown in figure 1. As shown in the figure, drill a 3 mm hole on the square pipe to determine the location of the installation hole. The dog's head can be carved with a piece of rubber and then connected to the dog's neck with self-tapping screws. four
Dog legs are all cut from flat plates with grooved plates, and movable joints are installed on dogs with small screws and nuts. The dog's hind leg has an arc groove, and the arc groove and the side screw form a limit device (Figure 1). The dog's tail is inserted into place with a slit (Figure 2).
The transmission device of robot dog is quite special. The front and rear feet are handcuffed with a pair of shackles (Figure 2), and a reset rubber band is connected between the front and rear cuffs. The front cuff is made of sheet material, and the midpoint is fixed on the dog's chest with screws and nuts. In this way, the dog's front foot can only swing back and forth. When moving, the hind toes stand on tiptoe and the front feet wipe the ground, thus making the robot dog generate forward power. The "fetters" are made of iron wire and buckled at the top of the pillar protruding forward from the upper part of the hind leg. The force directly impacts the steel wire backward, pushing the hind legs backward and converting them into forward thrust.
The power device is installed in the abdomen of the dog. First of all, two holes are made between two oval wheels, which are crossed and aligned with each other, and two rubber bands are put on. The ends of the rubber band are tied to the hole in the middle of the dog's body. When debugging, pull the hind legs backward so that the wires do not touch the oval wheels. At this time, you can turn the wheel to tighten the rubber band, and then push the hind legs forward, so that the wire can block the oval two wheels. Then put the dog's feet on the table, the wire hangs down a little, the two wheels rotate, and the wire collides in turn, so that the two hind legs generate unequal back pedaling force, and part of the force is also transferred to the front legs, forming an asynchronous gait of four legs. After the robot dog is finished, test whether the rubber band is reset in time, whether the wires under the abdomen rise in time, whether the power of the rotor is sufficient and whether the height is appropriate. Rubber bands are tied at both ends of the steel wire under the abdomen, which can solve the problem of neutral reset when the steel wire is stuck in the cross rotor in time. The rubber band is pulled horizontally in the second half of the dog, and the small bamboo pieces of the trip block rub against the protruding part of the rotor, which can slow down the rotor and reset the rotating device, thus prolonging the walking time.