1. Box structure:

The steel plate used in the box is too thin or the internal lacing structure is unreasonable. When the new tire or the explosion-proof flat tire is disassembled, because the tire mouth is too tight, the column is too stressed on the box, which will directly cause deformation, which directly leads to The column is tilted to scratch the wheel or tire. The standard cabinet should have lacing on the top and bottom. The easiest thing is to look at the weight directly.

2. Motor:

The power of the motor is generally 1000W (380V) or more. In order to reduce the cost, some manufacturers use a motor of about 800W, and the working stability is much worse. When purchasing, the side cover can be disassembled to check the rated power of the motor. The motor should have low noise during operation and no obvious vibration.

3. Gearbox:

The speed reducer is the speed reducer for the transmission of the tire changer. Because the speed of the AC motor is too high, it must be reduced to 100r/min through the reduction box to work normally. The reduction box is usually made of special materials and alloy materials. When driving, it must have low noise, good balance performance and small clearance. Some small tire changer manufacturers use gearboxes made of inferior hard alloy castings, which are noisy during operation, and the gap is too large when shaking left and right, which affects the normal disassembly and assembly of tires, which may easily cause scratches on the wheels or tires.

4. The large cylinder selects the high-strength aluminum large cylinder, the inner diameter of the barrel selected by the big manufacturer: 186 or 200mm, the support ear distance: 70-90mm, the piston is made of all-aluminum, two sealing rubber rings and one sealing ring to ensure the tire pressure and cylinder life, the tire pressure is: 2500kg, and equipped with a quick-discharge valve to ensure the speed of the large shovel return, improve work efficiency. Some small manufacturers choose the large cylinder made of iron plate by stretching, 180mm, using nylon piston, a sealing rubber ring, sealing and wear-resisting effect can be imagined, the shovel tire pressure is also small, generally 1600 -1800kg, and in order to save costs to remove the fast-discharge valve, so many people bought a cheap grilled tire machine, always said that the machine is not strong, or the main reason for slow tires.

5. Air separation valve: aluminum or high-strength nylon products should be used. The joints are locked with locking joints. Many small manufacturers use poorly-made gas distribution valves to save costs, and use plastic quick-connect joints, which will result in air supply. When the pressure is too high, direct failures such as squibs and air leaks occur, and the service life is short.

6. small cylinder, the internal piston must be high-strength wear-resistant material or aluminum, many small manufacturers choose plastic or nylon products, seriously affecting the service life, the small valve should also choose the locking structure of the valve If you choose the quick-insertion type, you will be willing to have a leak, a weak tire, and other failures.

7. Dismantling the bird's head: The curved design curve should be scientific. It is not easy to be deformed after many years of use. It is smooth when loading and unloading tires, and protects the rim, tire and wheel hub from damage. The inferior disassembled bird's head curved design is not Reasonable, easy to scratch the wheel and tires, causing unnecessary losses to the garage or tire shop.