How to fix the problem of broken parts on the chain of toys

1、 Identify the problem When we find that the part where the toy is wound is damaged, we need to carefully inspect it first to determine the specific location of the damage, whether it is caused by damage to the spring or other parts or other reasons. 2、 Finding suitable tools During the repair process, some small tools are needed, such as flat nose pliers, screwdrivers, glue, thin metal wires, and so on. Choose appropriate tools according to the specific situation to make the repair process smoother. 3、 Prepare materials Materials such as springs, fine wire, glue, etc. are needed to repair the winding of toys. Adequate preparation should be made based on specific circumstances to ensure timely resolution of issues. 4、 Repair the spring If the problem lies in the spring being damaged, a thin metal wire can be used to re fix the spring in its original position, and then gently adjust its position with flat nose pliers to ensure smooth movement of the spring. 5、 Repair other parts If the problem is not with the spring, we need to check if other parts such as gears have any issues. They can be re glued together with glue, or damaged parts can be replaced with fine wire. 6、 Test Use After completing the repair, we need to test the effectiveness of the toy's use. Reinstall the spring and other components, then try rotating the toy to see if the strings can retract properly. If everything goes smoothly, then the toy can be used normally. In short, when the part where the toy is wound is damaged, we can choose different repair methods according to the specific situation. It should be noted that caution should be taken during the repair process to avoid injuring oneself, while ensuring the safety and reliability of the repair process and allowing the toy to be returned to use.

Summary of maintenance issues for plastic gears

Have you noticed these points about the equipment products and plastic gears you usually purchase? Can extend the overall lifespan! If plastic gears fail, it will affect the entire equipment, so we need to pay attention to the maintenance of plastic gears. Now let's follow Shunjie's editor and pay attention to these points where gears are prone to failure! 1. Tooth surface wear For open gear transmission or closed gear transmission containing unclean lubricating oil, due to the relative sliding between the meshing tooth surfaces, some harder abrasive particles enter the friction surface, causing changes in tooth profile, increased backlash, and excessive thinning of the gear leading to tooth breakage. In general, only when abrasive particles are mixed in the lubricating oil will it cause tooth surface abrasive wear during operation. 2. Tooth surface bonding For high-speed and heavy-duty gear transmission, due to the high friction and relative speed between the tooth surfaces, the temperature in the meshing area is too high. Once the lubrication conditions are poor, the oil film between the tooth surfaces will disappear, causing direct contact between the metal surfaces of the two teeth and resulting in mutual adhesion. When the two tooth surfaces continue to move relative to each other, the harder tooth surface tears off some of the material on the softer tooth surface along the sliding direction, forming grooves. Shunjie pays attention to the maintenance of plastic gears and these issues 3. Fatigue pitting When two meshing teeth come into contact, the force and reaction force between the tooth surfaces cause contact stress on the two working surfaces. Due to the changing position of the meshing point and the periodic motion of the gear, the contact stress changes in a pulsating cycle. Under the action of this alternating contact stress for a long time, small cracks will appear at the tool marks on the tooth surface. Over time, these cracks gradually expand laterally on the surface, forming a ring shape, causing small areas of peeling off on the surface of the gear teeth and forming some fatigue shallow pits. Plastic gear 4. Tooth breakage In the operation of engineering, gears that bear loads are like cantilever beams. When the periodic stress at the root of the gear exceeds the fatigue limit of the gear material, cracks will occur at the root and gradually expand. When the remaining part cannot withstand the transmission load, tooth breakage will occur. Gears may also experience tooth breakage due to severe impacts, unbalanced loads, and uneven materials during operation. 5. Plastic deformation of tooth surface Under impact loads or heavy loads, the tooth surface is prone to local plastic deformation, resulting in deformation of the surface of the involute tooth profile.

The characteristics of toy return cars

The "shaft" connected to the rear tire of the return car is fixedly connected to the gear inside the return gear. When the hand does work (drags) backwards on the car, the rear wheel rotates backwards and transmits force to the return gear through the shaft to do work. The gear drives the return gear structure (spring structure or rubber band structure) to convert the kinetic energy done by the hand into potential energy (such as rubber band rotation elongation or spring compression, etc.) When the hand is released, the car loses a force that maintains its balance, which is the increased frictional force between the rear tire and the ground when the hand is pressed on the car (commonly known as grip in F1). The return gear releases potential energy through the shaft in the opposite direction to do work, and the shaft rotates to convert potential energy into kinetic energy. Due to the usual design of rear wheel forward drive (i.e. counterclockwise when viewed from the left of the car), the return gear is designed for rear wheel energy storage (i.e. clockwise when viewed from the left of the car). Additionally, due to the fixed direction of the axle, as long as the return gear can store enough energy (i.e. has enough revolutions) or has enough static friction with the ground, the return car can move forward through the energy output of the return gear, which is the heart.