CN-122001970-A - Colliery calls in reporting system

CN122001970ACN 122001970 ACN122001970 ACN 122001970ACN-122001970-A

Abstract

The invention relates to the technical field of industrial communication equipment, in particular to a coal mine incoming call reporting system which comprises a call base machine, an acoustic guide cover, a connecting piece and a connecting piece, wherein the acoustic guide cover is arranged at a microphone end of the call base machine and used for directionally collecting human voice and reducing noise of environmental noise, the acoustic guide cover comprises a cylindrical base and a plurality of curved surface blades circumferentially and uniformly distributed on a first end face of the cylindrical base, a main through hole is arranged along the axis of the cylindrical base, at least one closed cavity is arranged in a body of the cylindrical base, at least one composite channel is formed in the curved surface blades, the composite channel comprises micro-perforations penetrating through the curved surface blades and neck channels communicating inner cavities of the micro-perforations with the cavity, and the connecting piece is used for detachably connecting the acoustic guide cover to the microphone end of the call base machine. The scheme realizes effective absorption of typical low-frequency bombing noise and high-frequency sharp noise in the pit, and can greatly improve the signal-to-noise ratio of output voice through active acoustic energy consumption rather than passive blocking.

Inventors

YAO LEI
ZHANG MINGQUAN
WANG JIWEI
ZHOU BAOXIN
TANG YANFENG
SUI WEILI
XI LEI

Assignees

淮北矿业股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260126

Claims (10)

1. An incoming call reporting system for a coal mine, comprising a call-in landline and a telecommunication connection with other communication terminals, and characterized by further comprising: The acoustic dome is arranged at the microphone end of the telephone and is used for directionally collecting human voice and reducing noise of environmental noise, and comprises a cylindrical base and a plurality of curved surface blades circumferentially and uniformly distributed on the first end face of the cylindrical base, and the curved surface blades form a horn-shaped cover body at the first end of the cylindrical base; a main through hole penetrating through the cylindrical base is formed along the axis of the cylindrical base, and at least one closed cavity is formed in the body of the cylindrical base; At least one composite channel is formed in the curved blade, and the composite channel comprises a micro-perforation which is parallel to the cylindrical base and radially penetrates through the curved blade, and a neck channel which communicates the inner cavity of the micro-perforation with the cavity in the cylindrical base; and the connecting piece is used for detachably connecting the acoustic dome to the microphone end of the telephone.
2. The incoming call reporting system of claim 1, wherein gaps for acoustic wave diffusion are left between a plurality of said curved blades.
3. The coal mine incoming call reporting system as recited in claim 1, wherein the cavities in the body of the cylindrical base are disposed in one-to-one correspondence with the curved blades.
4. The coal mine incoming call reporting system as recited in claim 1, wherein a plurality of said composite channels are provided on a single said curved blade, and wherein the cross-sectional area and length of the neck channel in each composite channel are different.
5. The coal mine incoming call reporting system as recited in claim 1, wherein said cavity is a cylindrical cavity.
6. The coal mine incoming call reporting system as recited in claim 1, wherein the cross-sections of the microperforations and the neck passages are circular, and the neck passages have an inner diameter smaller than the inner diameter of the corresponding microperforations.
7. The coal mine incoming call reporting system as claimed in claim 1, wherein a mounting groove which is in sealing fit with the bottom of the curved blade is formed in the first end face of the cylindrical base, the mounting groove is communicated with the corresponding cavity, one end of the neck passage is communicated with the micro-perforation when the corresponding curved blade is mounted in the mounting groove, the other end of the neck passage penetrates through the bottom of the curved blade, and the neck passage is communicated with the cavity when the bottom of the curved blade is mounted in the mounting groove.
8. The coal mine incoming call reporting system as recited in claim 1, wherein the aperture of the microperforations is set to 0.3-1.0mm.
9. The coal mine incoming call reporting system of claim 1, wherein the main through hole is a tapered hole tapered in a direction away from the cover body, the inner diameter of the small end of the main through hole is 20-30 mm, and the inner diameter of the large end of the main through hole is 40-60 mm.
10. The system of claim 1, wherein the connector comprises a tubular elastic sleeve with two open ends, one end of the tubular elastic sleeve is sleeved with the second end of the cylindrical base and fixedly connected with the cylindrical base, and the other end of the tubular elastic sleeve is sleeved outside the microphone end of the telephone.

Description

Colliery calls in reporting system Technical Field The invention relates to the technical field of industrial communication equipment, in particular to a coal mine incoming call reporting system. Background In the underground coal mine safety production system, miners report or call emergency to a ground dispatching center or other terminals at regular time through explosion-proof wired telephones arranged in a roadway, which is a key link for guaranteeing safety. However, because the environmental noise in the main working area (such as the vicinity of the mining face, the transportation lane and the pump station) is extremely severe, the sound pressure level often exceeds 90dB, and the frequency spectrum is complex, and a large amount of low-frequency vibration noise and medium-high-frequency aerodynamic noise generated by mechanical equipment are included, the called end often causes abnormal calling audio due to the messy environmental noise of the called end, and the communication information cannot be accurately acquired. In the prior art, the improvement of the call quality mainly depends on two approaches, namely, the post-manual hearing-distinguishing and checking of the call content are performed, the efficiency is low and information is delayed, and the electronic noise reduction technology is adopted. The electronic noise reduction algorithm (such as active noise reduction) is effective for steady-state noise, but is poor in underground transient and impact noise treatment and is susceptible to failure caused by strong noise overload. In addition, although the simple physical sound-proof cover can partially isolate air from sound, the sound-proof cover has very little effect on dominant low-frequency solid sound transmission, and causes a can-sealing effect such as reverberation and the like and inconvenient use. Disclosure of Invention The invention aims to solve the technical problems of electronic noise reduction and poor physical sound insulation effect in the prior art by providing a coal mine incoming call reporting system. In order to solve the technical problems, the invention adopts the technical proposal that the invention provides a coal mine incoming call reporting system, which comprises: a call fixed telephone is in telecommunication connection with other communication terminals; The acoustic dome is arranged at the microphone end of the telephone and is used for directionally collecting human voice and reducing noise of environmental noise, and comprises a cylindrical base and a plurality of curved surface blades circumferentially and uniformly distributed on the first end face of the cylindrical base, and the curved surface blades form a horn-shaped cover body at the first end of the cylindrical base; A main through hole is formed along the axis of the cylindrical base, and at least one closed cavity is formed in the body of the cylindrical base; At least one composite channel is formed in the curved blade, and the composite channel comprises a micro-perforation which is parallel to the cylindrical base and radially penetrates through the curved blade, and a neck channel which communicates the inner cavity of the micro-perforation with the cavity in the cylindrical base; and the connecting piece is used for detachably connecting the acoustic dome to the microphone end of the telephone. Further, gaps for sound wave diffusion are reserved among the curved blades. Further, the cavities in the body of the cylindrical base are arranged in one-to-one correspondence with the curved blades. Further, a plurality of composite channels are arranged on the same curved blade, and the cross-sectional area and the length of the neck channel in each composite channel are different. Further, the cavity is a cylindrical cavity. Further, the cross sections of the micro-perforations and the neck channels are circular, and the inner diameter of the neck channel is smaller than the inner diameter of the corresponding micro-perforations. Further, the first end face of the cylindrical base is provided with a mounting groove in sealing fit with the bottom of the curved blade, the mounting groove is communicated with the corresponding cavity, when the corresponding curved blade is mounted in the mounting groove, one end of the neck channel is communicated with the microperforation, the other end of the neck channel penetrates through the bottom of the curved blade, and when the bottom of the curved blade is mounted in the mounting groove, the neck channel is communicated with the cavity. Further, the aperture of the microperforations is set to 0.3-1.0mm. Further, the main through hole is a tapered hole tapered towards the direction away from the cover body, the inner diameter of the small end of the main through hole is 20-30 mm, and the inner diameter of the large end of the main through hole is 40-60 mm. The sound pressure of the sound wave is increased when the sound wave is restrained in the pipeline