It is common for equipment to malfunction in our homes, and in many cases, it is a minor problem that can be easily repaired by oneself. At this time, electric screwdrivers have become important disassembly and assembly tools, so when choosing, one must also be careful in every aspect.

In fact, electric screwdrivers, also known as electric screwdrivers or electric screwdrivers, are mainly used to tighten and loosen screws. In addition, this type of electric tool itself has a mechanism for adjusting and limiting torque, so it can also be used to assemble wiring.

Compared to ordinary manual screwdrivers, electric screwdrivers have higher work efficiency and are more convenient to use. Their biggest feature is that they are effortless, and even women can easily get started and complete repair and disassembly work alone.

However, since it has been optimized from manual to electric, it means that its structure and configuration have become more complex. Therefore, when selecting, it is necessary to have a deeper understanding of its style, power supply method, functions, and components, which is more conducive to finding a suitable electric screwdriver for your own use.

Firstly, what we need to understand is the basic style of electric screwdrivers. According to their different internal structures, they can be divided into two different types of screwdrivers: direct drive type and safety clutch type. By understanding these two points, one can have a clear idea when making a selection and avoid being misled by appearances.

1、 Direct Drive Class

Firstly, let's take a look at direct drive electric screwdrivers. These screwdrivers are not equipped with any form of safety clutch, have a very simple mechanical structure, and are relatively low-cost. According to the method of cutting off power, they can be divided into three types of electric screwdrivers: non torque control, braking torque control, and current control.

1. Non torque control type

The non torque controlled electric screwdriver uses a non automatic method to cut off the power supply, and the completion of its thread assembly is subjectively determined by the operator.

2. Brake torque control type

The braking torque control type electric screwdriver also uses a non automated method to cut off the power supply. This type of screwdriver can use a step-down transformer to set more taps to adjust the voltage and control the size of the assembly torque.

This type of screwdriver has high voltage, high braking current, and large braking torque. However, due to the motor running in the pre braking state, the speed is reduced, so the effectiveness of this type of electric screwdriver is also relatively low.

3. Current control type

The current controlled electric screwdriver adopts an automatic power cut-off method, which mainly controls the assembly torque of the electric screwdriver through the correspondence between the electromagnetic torque of the motor and the current. This type of tool has a wide immediate control range and high immediate control accuracy, suitable for higher screw assembly characteristics.

Summary: Since it is for home decoration maintenance, the tools must be practical. Although non torque controlled screwdrivers have lower costs, they have a high damage rate to the cross groove and are not suitable. In comparison, the other two types of screwdrivers operate more stably.

2、 Safety clutch type

Then there are electric screwdrivers for safety clutches, which usually have a dedicated safety clutch mechanism at the low-speed end of the transmission chain. When the transmitted torque exceeds its set value, the clutch will trip.

Based on the different principles and functional characteristics of the clutch, we can also divide this type of electric screwdriver into three small categories: forced clutch type, bufferable clutch type, and adjustable precise power-off clutch type.

1. Forced clutch type

The forced clutch type electric screwdriver is actually a non automatic power cutting tool. If you observe carefully, you will find that the axial pressure we apply to the electric screwdriver is also the pressure between the active and driven half clutches.

2. Buffered clutch type

The buffering clutch type electric screwdriver, on the other hand, replaces the axial pressure applied by us with the pressure on the adjustable pressure spring in structure. Therefore, this type of screwdriver can also obtain an adjustable release torque.

3. Adjustable precise power-off clutch type

The adjustable precise power-off clutch type electric screwdriver belongs to the automatic power-off tool, and it can use position detectors such as limit switches and Hall converters on the basis of the bufferable clutch to convert the axial displacement generated by the clutch when it is disengaged into an electrical signal, thereby promoting the functional circuit to cut off the power supply current of the motor.

Summary: It should be noted that after the forced clutch type screwdriver is disengaged, the axial pressure is not removed, and the power supply is not cut off. In this way, the clutch will produce an additional tightening torque due to impact. This means that the final result of assembly depends entirely on the operator's skills, so it is more suitable for experienced colleagues.

Although the buffer clutch type screwdriver can reduce our labor intensity to a certain extent, it also requires certain skills in handling, which is not suitable for friends with unfamiliar skills to use.

In contrast, the third type of screwdriver uses a power electronic circuit, which has a fast response time and good performance. Even novice home repair and inspection technicians can easily control it, making it very reliable.

At all times, safety should be the top priority, and even simple home maintenance should not underestimate this issue. Therefore, the next thing to learn is about the power supply and anti electric shock safety of electric screwdrivers.

4、 Powered by series excited motors

This method is mainly used for wall panel screwdrivers with high power and torque, as well as large-sized wood screw screwdrivers. These tools generally use 110V or 220V AC power sources, which are relatively mature in technology and mainly have a double insulation structure inside.

5、 Powered by permanent magnet motors

On the contrary, this method powered by permanent magnet motors is more commonly used for electric screwdrivers with lower power and torque. According to voltage, it can be divided into three types: battery powered, ultra-low safety voltage powered, and high-voltage powered.

1. Battery powered

Among them, the current powered electric screwdriver is not related to high-voltage industrial electricity during use, so there is no risk of electric shock. This type of screwdriver can mainly be used in special environments for household use and without industrial electricity.

2. Extra low safety voltage power supply

The ultra-low safety voltage power supply method can choose to use centralized power supply or individual power supply according to the actual situation of the user.

Centralized power supply refers to the use of a large capacity ultra-low safety voltage power supply to provide the energy required for several sets of screwdrivers to work on the assembly line.

The so-called individual power supply refers to a power control box containing only one ultra-low safety voltage power supply and a set of controllers.

Due to the fact that the electric screwdriver is powered by ultra-low safety power sources, the electrical safety of this method is also easily guaranteed.

3. High voltage power supply

In contrast, high-voltage powered electric screwdrivers are directly connected to AC 110V or 220V industrial power, which eliminates the need for specialized ultra-low safety voltage power sources and makes them more convenient to use.

Summary: Compared to manual screwdrivers, electric screwdrivers have indeed improved efficiency and are more convenient to use. However, since it involves electrical energy, safety cannot be ignored. The above power supply methods and safety are important factors that we need to consider when selecting screwdrivers.

After understanding the structural characteristics and power supply methods of different electric screwdrivers, the next step is to clarify the built-in functions of the body. A convenient and user-friendly screwdriver not only needs to have reliable basic functions, but also has other important functions that can play an excellent auxiliary role in the operation process.

Press down on the self start function. The electric screwdriver with this function does not have a trigger for a power switch in appearance. It mainly pushes the top rod through the axial movement of the cross groove under the screwdriver head. When the top rod passes through the center hole of the clutch, the center gap of the reducer, and the shaft hole of the hollow rotor shaft, it will trigger the power supply at the rear end of the motor, thus starting the motor.

Stripping and folding function. Although electric screwdrivers are mainly used to tighten screws, they are not limited. Sometimes, when repairing certain sockets at home, it is inevitable to encounter situations where wires need to be peeled or broken. In fact, screwdrivers can also be used to handle these situations. Some electric screwdrivers now have some small settings specifically designed for this type of situation on the body.

Screw adsorption function. The screw adsorption function actually relies on a magnetic suction design, which can use magnetic force to suck the front end of the body or the screwdriver head together with the screw head. This way, even the smallest screw does not have to worry about falling, making operation more convenient.

In addition, there is a vacuum screw adsorber that can use a vacuum pump to create negative pressure inside the adsorption cover on the screwdriver head through a plastic suction tube, achieving the adsorption effect on the screw head.

Lighting function. In addition, the most awkward aspect of home decoration maintenance is the repair in some narrow corners, which is difficult to reach due to the difficulty of light, causing great inconvenience. Now, some electric screwdrivers have considered this issue and specially installed LED lights on the body, providing excellent lighting.

For electric screwdrivers, the more comprehensive the functions, the better the use. Of course, the more powerful the functions, the higher the required cost, and the tool cost will also increase. For ordinary household maintenance work, being able to have any of the above two functions is more than enough.