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Electric screw driver with adjustable output torque

An electric screwdriver, output torque technology, used in screwdrivers, power tools, wrenches, etc., can solve the problems of motor damage, consuming operator's physical strength, and severe motor vibration.

Inactive Publication Date: 2016-04-20
宁波中旺工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many defects in the existing electric screwdrivers, such as poor durability of the battery, frequent maintenance, severe vibration of the motor during work, which seriously consumes the physical strength of the operator, and the motor screwdriver is easy to get stuck when tightening, causing the motor to be overloaded. RISK OF DAMAGE TO THE MOTOR

Method used

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  • Electric screw driver with adjustable output torque
  • Electric screw driver with adjustable output torque
  • Electric screw driver with adjustable output torque

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Such as figure 1 As shown, the present invention provides an electric screwdriver, which has a housing 1 and a handle 2. A motor 3 is installed in the housing 1. An output shaft 12 is provided at the front end of the housing 1. The output shaft 12 is connected to the motor 3 through a transmission mechanism 4. The front end of the output shaft 12 is provided with a screwdriver bit socket, and different types of screwdriver bits 16 can be installed in the screwdriver bit socket.

[0014] The handle 2 is provided with a control unit 19, a transmitting / receiving device 50 for signal sending / receiving, a storage unit 51, a charging socket 52, a switch 17 connected to the motor 3 through the control unit 19, and a battery pack under the handle 2 18 connected to the charging socket 42, the handle 2 below is provided with battery pack 18, the motor 3 is controlled to start and stop by switch 17, and the battery pack 18 can be charged by charging socket 12 connected with extern...

Embodiment 2

[0019] On the basis of Example 1, such as figure 1 As shown, the electric screwdriver of the present invention has a control unit 19, the switch 17 inputs the signal of opening or closing to the control unit 19, and has a storage unit 51, which stores data related to the operation of the electric screwdriver in the storage unit 51, and has pre-authorized information or data, the control unit 19 can read and store data from the storage unit 51 .

[0020] With an external, legally authorized operator's key 150, schematically represented in the drawings, the key 150 has transmitting / receiving means, and preferably a wireless and remote-action interface, as typical optical infrared interface or radio. Communicate with the transmitting / receiving device 50 of the electric screwdriver through the above interface, and the transmitting / receiving device 50 of the electric screwdriver is connected with the control unit 19 .

[0021] The control unit 19 sends out the authorization code ...

Embodiment 3

[0024] On the basis of Embodiments 1 and 2, in order to further accurately adjust the torque output value of the electric screwdriver, the control circuit of the electric screwdriver of the present invention is further optimized.

[0025] Such as image 3 As shown, the control circuit 70 has a control unit 19 , an electronic switch 171 , a switch 17 , a storage unit 50 , a current limit setting switch 508 , a current limiter 503 , a current detection module 505 , a voltage detection module 501 , and a motor speed sensor 502 .

[0026] The motor 3 is connected to the battery pack 18 through the electronic switch 171 , and the electronic switch 171 is connected to the control unit 19 through the current limiter 503 .

[0027] Since the motor speed N is related to the motor voltage and the motor current I, and when the load increases, the motor current I also increases accordingly. To maintain the motor speed N, the corresponding motor voltage needs to be increased. Therefore, t...

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PUM

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Abstract

The invention relates to an electric screw driver with an adjustable output torque. The electric screw driver is characterized in that an adjusting ring is arranged on the front end of a shell; a threaded ring is arranged in the adjusting ring; the front end surface of an annular gear is a rugged torque adjusting surface; a rolling ball which leans against the torque adjusting surface is arranged in the shell; the rolling ball leans against a stop pin; a stop plate is arranged on the front end of the stop pin; a spiral supporting spring is arranged between the stop plate and the threaded ring. According to the electric screw driver disclosed by the invention, the threaded ring is enabled to move by rotating the adjusting ring, and the spiral supporting spring is enabled to be compressed or stretch, so that the purpose of mechanically adjusting a screw driver head among different output twisting forces can be achieved.

Description

technical field [0001] The invention relates to an electric tool, in particular to an electric screwdriver with adjustable output torque. Background technique [0002] An electric screwdriver is a hand tool, generally having a housing and a screwdriver arranged on an output shaft. Widely used in industrial and household fields, usually used to install or remove threaded fasteners, apply torque or rotation to workpieces. [0003] The existing electric screwdriver includes a housing, in which a motor is set, and the housing is used as a position for the operator to hold at the same time. A screwdriver is mounted on the front end of the housing. The battery drives the motor, and the motor drives the screwdriver to rotate through the transmission part. However, there are many defects in the existing electric screwdrivers, such as poor durability of the battery, frequent maintenance, severe vibration of the motor during work, which seriously consumes the physical strength of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B21/00B25B23/00
CPCB25B21/00B25B23/00
Inventor 舒扬
Owner 宁波中旺工具有限公司
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