Case

The electric wheelchair is based on the traditional manual wheelchair, superimposed with high-performance power drive device, intelligent control device, drag pool and other components, transformed and upgraded. It is a new generation of intelligent wheelchair with artificial manipulation intelligent controller, which can drive the wheelchair to complete forward, backward, steering, standing, lying down, and other functions. It is a high-tech combination of modern precision machinery, intelligent numerical control, engineering mechanics and other fields. Technology Products.

The electric wheelchair is mainly composed of the following parts: the main frame, the controller, the motor, the battery, and other accessories such as the seat back pad

1. Main frame

The main frame determines the structural design, external width, seat width, external height, backrest height and function of the electric wheelchair.

The material can be divided into steel pipe, aluminum alloy, aviation titanium alloy, and some high-end models begin to use carbon fiber material. Most of the common materials in the market are steel pipes and aluminum alloys.

The cost of steel pipe material is relatively low, and the load-bearing is not bad. The disadvantage is that it is bulky, easy to rust and corrode in water and humid environments, and has a short service life.

Most mainstream electric wheelchairs use aluminum alloys, which are lighter than steel pipes and have stronger corrosion resistance.

The material strength, lightness and corrosion resistance of aviation titanium alloy are better than the first two. However, due to the cost of materials, it is currently mainly used in high-end and portable electric wheelchairs, and the price is also more expensive.

In addition to the material of the main frame, the details of other components of the car body and the welding process should also be observed, such as: the material of all accessories, the thickness of the materials, whether the details are rough, whether the welding points are symmetrical, and the more densely arranged the welding points, the better. The arrangement rules similar to fish scales are the best, it is also called fish scale welding in the industry, and this process is the strongest. If the welding part is uneven or there is leakage of welding, it will gradually appear a safety hazard with the use of time.

The welding process is an important link to observe whether a product is produced by a large factory, whether it is serious and responsible, and producing products with high quality and quantity.

2. Controller

The controller is the core part of the electric wheelchair, just like the steering wheel of a car, its quality directly determines the controllability and service life of the electric wheelchair. The controller is generally divided into: upper controller and lower controller.

Most imported brand controllers are composed of upper and lower controllers, and most domestic brands only have upper controllers. The most widely used imported controller brands are Dynamic Controls and PG Drives Technology. The quality of imported products is better than that of domestic products, and the cost and price are also higher. They are generally equipped on medium and high-end electric wheelchairs.

To simply check the quality of the controller, you can try the following two operations:

1) Turn on the power switch, push the controller, and feel whether the start is smooth; release the controller, and feel whether the car stops immediately after the sudden stop.

2) Control the rotating car on the spot and feel whether the steering is smooth and flexible.

3. Motor

This is the core component of the driver. According to the way of power transmission, it is mainly divided into brush motor (also called worm gear motor) and brushless motor (also called hub motor), and there is also a crawler motor (similar to the tractor in the early years, driven by a belt)

The advantages of the brushed motor (turbine worm motor) are that the torque is large, the torque is large, and the driving force is strong. It is easy to go up some small slopes, and the start and stop are relatively stable. The disadvantage is that the conversion rate of the battery is low, that is, it is relatively expensive, so the wheelchair using this motor is often equipped with a large-capacity battery. The weight of the whole vehicle using this motor is about 50-200 catties.

The advantages of brushless motor (wheel hub motor) are power saving and high conversion rate of electricity. The battery equipped with this motor does not need to be particularly large, which can reduce the weight of the vehicle. Most of the vehicle using this motor weighs about 50 pounds.

The power transmission of the crawler motor is too long, it is relatively expensive, the power is weak, and the cost is low. At present, only a few manufacturers are using this motor.

4. Battery

It is well known that there are lead-acid batteries and lithium batteries. Whether it is a lead-acid battery or a lithium battery, it is necessary to pay attention to maintenance and maintenance. When the electric wheelchair is idle for a long time, it needs to be charged and maintained regularly. It is generally recommended to charge the battery at least once every 14 days, because even if it is not used, the battery will slowly power consumption.

When comparing the two batteries, most people agree that lead-acid batteries are inferior to lithium batteries. What's so good about lithium batteries? The first is lighter, and the second has a longer service life. Most of the standard configuration of lightweight electric wheelchairs are lithium batteries, and the price is also higher.

The voltage of the electric wheelchair is generally 24v, and the capacity unit of the battery is AH. Under the same capacity, the lithium battery is better than the lead-acid battery. However, most domestic lithium batteries are around 10AH, and some 6AH batteries meet the aviation boarding standard, while most lead-acid batteries start at 20AH, and there are 35AH, 55AH, 100AH, etc., so in terms of battery life, lead-acid batteries Stronger than lithium batteries.

The 20AH lead-acid battery lasts about 20 kilometers, the 35AH lead-acid battery lasts about 30 kilometers, and the 50AH lead-acid battery lasts about 40 kilometers.

Lithium batteries are currently mainly used in portable electric wheelchairs, and are relatively inferior to lead-acid batteries in terms of battery life. The cost of battery replacement in the later stage is also higher than that of lead-acid batteries.

5. The braking system is divided into electromagnetic braking and resistance braking

To judge the quality of the brakes, we can test the release of the controller on the slope to see if it will slide and feel the length of the braking buffer distance. The short braking distance is relatively more sensitive and safer.

The electromagnetic brake can also use the magnetic brake when the battery is dead, which is relatively safer.

6. Wheelchair seat back cushion

At present, most manufacturers are equipped with double-layer back pads, which are breathable in summer and cool in winter. The quality of the seat back cushion mainly depends on the flatness of the fabric, the tension of the fabric, the details of the wiring, the fineness of the craftsmanship, etc. If you look closely, you will find the gap.

Ningbo Baichen mainly manufactures electric wheelchairs for the elderly and disabled.