Handheld drilling machine provided with improved internal noise reduction device

Abstract

The invention belongs to the technical field of mechanical equipment, and relates to a handheld drilling machine provided with an improved internal noise reduction device. The handheld drilling machine comprises a machine shell, a front cover, a rear cover, an output shaft, a pneumatic power device, an air inlet device, an exhaust hole, a first handle, a second handle and a noise reduction devicein the machine shell; the noise reduction device comprises a front end splicing component, a rear end splicing component, multiple A splicing components arranged between the front end splicing component and the rear end splicing component and B splicing components between every two adjacent A splicing components; the air inlet hole is formed in the front end splicing component; an air outlet holeis formed in the lower part of the rear end splicing component; and the front end splicing component, the rear end splicing component, the A splicing components and the B splicing components can forman upper layer porous plate noise reduction chamber, a middle layer corrugated noise reduction chamber and a lower layer porous plate noise reduction chamber after being spliced. The noise reduction device is convenient to assemble and disassemble and simple in machining technique, and has high manufacturability and practicability; and besides, the three layers of noise reduction chambers can be formed, so that the noise reduction effect of the drilling machine can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment and relates to a hand-held drill with an improved built-in noise reduction device. Background technique [0002] Coal mines in my country are mainly mined underground, and a large number of tunnels need to be dug underground. Using tunnel support to protect the smoothness of the tunnel and the stability of the surrounding rock is of great significance to mine construction and production. During the construction of the tunnel support, drilling rigs are required for drilling operations. In order to meet the explosion-proof safety requirements of underground mines, hand-held pneumatic drilling rigs with underground compressed air as the power source are often used for construction. However, hand-held pneumatic drilling rigs will emit high noise during work. Working in this environment for a long time will make the staff Agitated emotions can easily lead to safety accidents, and even direct...

AI Technical Summary

Problems solved by technology

[0002] Coal mines in my country are mainly mined underground, and a large number of tunnels need to be dug underground. Using tunnel support to protect the smoothness of the tunnel and the stability of the surrounding rock is of great significance to mine construction and production. During the construction of the tunnel support, drilling rigs are required for drilling operations. In order to meet the explosion-proof safety requirements of underground mines, hand-held pneumatic drilling rigs with underground compressed air as the power source are often used for construction. However, hand-held pneumatic drilling rigs will emit high noise during work. Working in this environment for a long time will make the staff Agitated emotions can easily lead to safety accidents, and even directly cause deafness, headaches and other symptoms of workers, which seriously endanger the health of workers;

[0003] At present, the existing solution is often to install a silencer at the air outlet of the drilling rig casing. The additional silencer not only has poor noise reduction effect, but also greatly increases the volume and weight of the drilling rig, which is very inconvenient to use;

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