Mining amplified phone

Abstract

The utility model provides a mining amplified phone which comprises an explosion-proof cylinder and a sealing assembly. An openable sound receiving cavity is arranged in the explosion-proof cylinder; a control chip and a receiver are arranged in the radio cavity; and the receiver is fixed on the bottom surface of the radio cavity through the positioning plate and the fixing plug. The sealing assembly comprises a sealing cylinder, a sealing plug, a pressing ring and a pressing cover plate, the sealing cylinder is arranged on the outer side wall of the explosion-proof cylinder, the sealing plug, the pressing ring and the pressing cover plate are sequentially arranged in the sealing cylinder, the sealing plug is in contact with the outer side wall of the explosion-proof cylinder, and the transmission line extends out of the pressing cover plate. According to the utility model, while the receiver is fixed, the receiver is isolated from the sound receiving cavity in the explosion-proof cylinder, so that the probability of damage to the receiver is reduced. The detachable radio cavity cover plate and the fixing plug can conveniently maintain and replace the control chip and the receiver. The pressing ring of the sealing assembly extrudes the sealing plug to form sealing between the transmission line hole and the transmission line, so that the sealing performance of the explosion-proof cylinder is ensured, and the explosion-proof performance of the amplified phone is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of amplified telephone technology, and in particular relates to a mining amplified telephone. Background Technology

[0002] Due to the complex structure of mine tunnels, efficient communication between workers in different areas is often difficult. Walkie-talkies and similar devices can only provide one-to-one information transmission, and the complex environment within the mine can interfere with their use. Using amplified telephones allows for information transmission between different areas.

[0003] Public address systems often feature detachable microphones, but these microphones are easily damaged by vibration or operational errors, requiring frequent maintenance and replacement of internal components such as the receiver. However, public address systems in mines are mostly designed with sealed structures, necessitating the maintenance and replacement of explosion-proof features. This makes replacing internal components cumbersome and the cost of replacing the entire system high. Utility Model Content

[0004] In view of this, the present invention aims to provide a mine-use public address telephone that allows for convenient internal repair and replacement while ensuring its explosion-proof performance.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A mine-use public address telephone includes an explosion-proof cylinder and a sealing assembly. A receiving cavity is provided inside the explosion-proof cylinder, and a removable receiving cavity cover is provided at the top of the receiving cavity. A control chip and a receiver are provided inside the receiving cavity, and the receiver is electrically connected to the control chip via a receiver line. A positioning plate is provided on the bottom surface of the receiving cavity, and the positioning plate has a receiving hole for accommodating the receiver. A fixing plug is also provided at the top of the receiving hole, and the bottom surface of the fixing plug contacts the receiver. The fixing plug has a receiver line hole for accommodating the receiver line. A receiving hole is provided on the bottom shell of the explosion-proof cylinder, and the receiving hole is arranged opposite to the receiver.

[0007] The sealing assembly includes a sealing cylinder, a sealing plug, a clamping ring, and a clamping cover plate. The sealing cylinder is disposed on the outer wall of the explosion-proof cylinder. The sealing plug, clamping ring, and clamping cover plate are disposed sequentially inside the sealing cylinder, and the sealing plug is in contact with the outer wall of the explosion-proof cylinder. Both the sealing plug and the clamping cover plate are provided with transmission line holes for accommodating transmission lines.

[0008] Furthermore, the microphone hole is provided with a detachable isolation component; the isolation component includes an upper isolation plate and a lower isolation plate, which are connected by a mounting cylinder. The upper isolation plate is provided with multiple upper through holes, and the lower isolation plate is provided with multiple lower through holes, which are staggered with each other.

[0009] Furthermore, the bottom surface of the upper isolation plate is provided with multiple upper isolation cylinders, which are arranged one-to-one with multiple upper through holes. The axis of each upper isolation cylinder coincides with the axis of the corresponding upper through hole. The inner diameter of the upper isolation cylinder is not less than the inner diameter of the upper through hole, and the axial length of the upper isolation cylinder is less than the axial length of the mounting cylinder.

[0010] Furthermore, the top surface of the lower isolation plate is provided with multiple lower isolation cylinders, which are arranged in a one-to-one correspondence with multiple lower through holes. The axis of each lower isolation cylinder coincides with the axis of the corresponding lower through hole. The inner diameter of the lower isolation cylinder is not less than the inner diameter of the lower through hole, and the axial length of the lower isolation cylinder is less than the axial length of the mounting cylinder.

[0011] Furthermore, the fixing plug is frustum-shaped, and the small end of the frustum-shaped fixing plug contacts the receiver. The receiving hole includes a positioning section and an isolation section. The receiver is disposed in the positioning section. The inner wall of the isolation section is parallel to the side wall of the fixing plug, and the top surface of the fixing plug is flush with the top surface of the positioning plate.

[0012] Furthermore, a sealing gasket is provided between the receiver and the inner wall of the receiving hole.

[0013] Furthermore, the sealing plug is frustum-shaped, and the large end of the frustum-shaped sealing plug contacts the outer wall of the explosion-proof cylinder. The inner wall of the compression ring is an inner conical surface parallel to the side wall of the sealing plug, and a compression ring is provided on the inner conical surface.

[0014] Furthermore, the explosion-proof cylinder is also provided with a sound amplification cavity, the top of which is provided with a detachable sound amplification cavity cover plate, a loudspeaker is provided inside the sound amplification cavity, and the inner wall of the sound amplification cavity is provided with a loudspeaker wire hole for accommodating the loudspeaker wire. The loudspeaker is electrically connected to the control chip through the loudspeaker wire.

[0015] Furthermore, the bottom shell of the explosion-proof cylinder is also provided with a sound amplification hole, and a limiting seat is also provided on the bottom surface of the sound amplification cavity, with the limiting seat and the sound amplification hole being arranged opposite each other.

[0016] Compared with existing technologies, the mine-use loudspeaker telephone described in this utility model has the following advantages:

[0017] (1) The mine-use loudspeaker telephone described in this utility model uses a positioning plate and a fixing plug to fix the receiver. Simultaneously, the fixing plug isolates the receiver from the receiving cavity inside the explosion-proof cylinder, further reducing the probability of receiver damage. The removable receiving cavity cover allows for convenient maintenance and replacement of the control chip inside the receiving cavity, and the fixing plug facilitates easy maintenance and replacement of the receiver. The sealing assembly seals the part of the transmission line that exits the explosion-proof cylinder. The compression ring on the sealing plug creates a seal between the transmission line hole and the transmission line, ensuring the sealing performance of the explosion-proof cylinder and guaranteeing the explosion-proof performance of the loudspeaker telephone.

[0018] (2) The mine-use loudspeaker telephone described in this utility model, through the staggered upper and lower through holes on the isolation component, as well as the upper and lower isolation cylinders, can isolate most of the water vapor and dust in the external environment, reducing the probability of receiver damage, while also retaining gaps for sound to pass through, ensuring the quality of sound collection by the receiver. The frustum-shaped fixing plug can strengthen the sealing between the receiver line hole and the receiver line by utilizing the impact generated by the explosion, further protecting the receiver. The frustum-shaped sealing plug can also strengthen the sealing between the transmission line hole and the transmission line when it is squeezed towards the center. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a mine loudspeaker telephone according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the isolation component described in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Explosion-proof cylinder; 2-Receiver cavity; 3-Receiver cavity cover plate; 4-Control chip; 5-Amplifier cable hole; 6-Amplifier cavity cover plate; 7-Amplifier cavity; 8-Limit seat; 9-Amplifier; 10-Amplifier hole; 11-Positioning plate; 12-Sealing gasket; 13-Receiver hole; 14-Isolation assembly; 15-Receiver; 16-Fixing plug; 17-Bottom shell; 18-Extrusion ring; 19-Pressure ring; 20-Inner conical surface; 21-Transmission line; 22-Pressure cover plate; 23-Sealing cylinder; 24-Sealing plug; 25-Mounting cylinder; 26-Upper isolation plate; 27-Lower isolation plate; 28-Upper through hole; 29-Lower through hole; 30-Upper isolation cylinder; 31-Lower isolation cylinder. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] A type of loudspeaker for mining, such as Figure 1As shown, the device includes an explosion-proof cylinder 1 and a sealing assembly. The explosion-proof cylinder 1 can be installed on the wall inside the mine to fix the loudspeaker telephone. A receiver 2 is provided inside the explosion-proof cylinder 1, and a removable cover plate is provided at the top of the receiver 2. A control chip 4 and a receiver 15 are provided inside the receiver 2, and the receiver 15 is electrically connected to the control chip 4 via a receiver cable. The top of the receiver 2 has an internal thread, and the side wall of the cover plate of the receiver 2 has an external thread that mates with the internal thread. The receiver 2 can be installed at the top of the receiver 2 via the threaded engagement, allowing the receiver 2 to be closed or opened. Due to the complex environment inside the mine, the receiver 15 is frequently affected by moisture, dust, and other factors, causing it to malfunction. Combustible gases may also be present in the mine, potentially seeping slowly or remaining inside the explosion-proof cylinder 1 due to operation. When the control chip 4 operates, it may generate electrical sparks or static electricity, igniting the combustible gas inside the explosion-proof cylinder 1. The good sealing of the explosion-proof cylinder 1 confines the explosion within its walls, achieving the explosion-proof function of the public address system and preventing major safety accidents caused by the ignition of combustible gases in the mine. However, this also leads to frequent damage to the control chip 4 due to the explosion. Therefore, the receiver 15 and the control chip 4 are considered vulnerable components in the public address system and require frequent maintenance and replacement. The removable cover of the receiver cavity 2 allows for convenient and quick replacement of components within the receiver cavity 2, while ensuring the sealing effect of the receiver cavity 2 after maintenance and replacement, thus meeting the explosion-proof performance requirements of the public address system.

[0029] A positioning plate 11 is provided on the bottom surface of the receiving cavity 2, and the positioning plate 11 has a receiving hole for accommodating the receiver 15. A fixing plug 16 is also provided at the top of the receiving hole, and the bottom surface of the fixing plug 16 is in contact with the receiver 15. The fixing plug 16 has a receiving wire hole for accommodating the receiving wire. A sound receiving hole 13 is provided on the bottom shell 17 of the explosion-proof cylinder 1, and the sound receiving hole 13 is arranged opposite to the receiver 15. Fixing the receiver 15 relative to the explosion-proof cylinder 1 can avoid the problem of the microphone of the traditional loudspeaker falling, reducing the probability of damage to the receiver 15. By fixing the receiver 15 in the receiving hole with the fixing plug 16, and at the same time using the fixing plug 16 to isolate the receiver 15 from the receiving cavity 2 in the explosion-proof cylinder 1 which is subject to explosion, the receiver 15 can be further protected. The explosion within the receiver cavity 2 further presses the retaining plug 16 against the receiver 15, strengthening the seal between the receiver cable hole and the receiver cable passing through it, thus preventing the explosion within the receiver cavity 2 from affecting the receiver 15. To ensure the quality of the voice collected by the receiver 15, the receiver 15 is connected to the external environment through the receiver hole 13 and collects the voice of the staff.

[0030] Specifically, the retaining plug 16 is frustoconical, with its small end contacting the receiver 15. The frustoconical retaining plug 16 can be easily inserted into and fixed within the receiving hole, thus securing the receiver 15 inside. The receiving hole includes a positioning section and an isolation section. The receiver 15 is positioned within the positioning section. The inner wall of the isolation section is parallel to the side wall of the retaining plug 16, and the top surface of the retaining plug 16 is flush with the top surface of the positioning plate 11. The receiver 15 can be guided by the inner wall of the isolation section, making it easier to insert into the positioning section. After the retaining plug 16 presses and secures the receiver 15, in the event of an explosion within the receiving cavity 2, the retaining plug 16 continues to press against the receiver 15 upon impact. Simultaneously, the shape of the isolation section causes the retaining plug 16 to press against the receiver cable hole, thereby strengthening the seal between the receiver cable hole and the receiver cable, preventing damage to the receiver 15 from the explosion. The top surface of the fixing plug 16 is flush with the positioning plate 11, which can prevent the fixing plug 16 from detaching from the isolation section due to uneven shock waves during an explosion, thus ensuring the fixing plug 16's effect on fixing and isolating the receiver 15.

[0031] In addition, a sealing gasket 12 is provided between the receiver 15 and the inner wall of the receiving hole. To ensure the explosion-proof effect of the explosion-proof cylinder 1, the sealing gasket 12 can fill the gap between the receiver 15 and the receiving hole, improving the sealing performance of the receiving cavity 2. For example, the sealing gasket 12 can be made of rubber, so that the receiver 15 has a certain displacement space when it is impacted, which can buffer the impact and reduce the probability of damage to the receiver 15.

[0032] The sealing assembly includes a sealing cylinder 23, a sealing plug 24, a clamping ring 19, and a clamping cover plate 22. The sealing cylinder 23 is disposed on the outer wall of the explosion-proof cylinder 1. The sealing plug 24, clamping ring 19, and clamping cover plate 22 are sequentially disposed inside the sealing cylinder 23, with the sealing plug 24 in contact with the outer wall of the explosion-proof cylinder 1. Both the sealing plug 24 and the clamping cover plate 22 are provided with transmission line holes for accommodating the transmission line 21. The transmission line 21 extends from inside the explosion-proof cylinder 1 to the outside of the explosion-proof cylinder 1 and is used to transmit signals for the loudspeaker telephone. To facilitate the replacement of the control chip 4, the transmission line 21 can be replaced at the same time. Then, the sealing assembly is used to seal the transmission line 21 as it exits the side wall of the explosion-proof cylinder 1, ensuring the airtightness of the internal space of the explosion-proof cylinder 1, thereby ensuring the explosion-proof performance of the loudspeaker telephone.

[0033] The sealing cylinder 23 is fixedly connected to the outer wall of the explosion-proof cylinder 1. The sealing plug 24 inside the sealing cylinder 23 is tightly attached to the outer wall of the explosion-proof cylinder 1. The transmission line 21 passes through the explosion-proof cylinder 1, then sequentially through the sealing plug 24, the clamping ring 19, and the clamping cover plate 22, and extends out from the clamping cover plate 22 to realize the signal transmission of the loudspeaker. The clamping cover plate 22 is threadedly connected to the opening of the sealing cylinder 23 away from the explosion-proof cylinder 1. The threaded connection can improve the sealing performance of the sealing cylinder 23 and the fixing performance of the clamping ring 19 and the sealing plug 24 inside the sealing cylinder 23. When the clamping cover plate 22 is screwed into the explosion-proof cylinder 1 inside the sealing cylinder 23, it can push the clamping ring 19 to move towards the sealing plug 24, pressing the sealing plug 24 against the side wall of the explosion-proof cylinder 1. By squeezing, the sealing plug 24 is deformed, which in turn deforms the transmission line hole, sealing the gap between the transmission line hole and the transmission line 21.

[0034] Optionally, the sealing plug 24 is frustum-shaped, with its larger end contacting the outer wall of the explosion-proof cylinder 1. The inner wall of the clamping ring 19 is an inner conical surface 20 parallel to the side wall of the sealing plug 24, and a compression ring 18 is provided on the inner conical surface 20. When the clamping cover plate 22 pushes the clamping ring 19 toward the sealing plug 24, the compression ring 18 moves gradually from the smaller end to the larger end on the side wall of the frustum-shaped sealing plug 24, thereby continuously squeezing the frustum-shaped sealing plug 24 toward the middle. This creates a better sealing effect between the transmission line hole and the transmission line 21, further ensuring the explosion-proof performance of the explosion-proof cylinder 1.

[0035] In one optional implementation of this embodiment, a detachable isolation component 14 is provided within the microphone hole 13. For example... Figure 2 As shown, the isolation assembly 14 includes an upper isolation plate 26 and a lower isolation plate 27, which are connected by a mounting cylinder 25. The upper isolation plate 26 has multiple upper through holes 28, and the lower isolation plate 27 has multiple lower through holes 29, which are staggered. The staggered upper through holes 28 and lower through holes 29 on the upper isolation plate 26 and lower isolation plate 27 can reduce the amount of moisture and dust from the external environment passing through the microphone hole 13, thus reducing the probability of damage to the receiver 15. The outer wall of the mounting cylinder 25 is provided with external threads, and correspondingly, the microphone hole 13 is provided with internal threads that can mate with the external threads. The isolation assembly 14 can be easily disassembled through the threaded engagement, facilitating cleaning and replacement of the isolation assembly 14, thereby ensuring the isolation performance of the isolation assembly 14 and improving the protection capability of the receiver 15.

[0036] Specifically, multiple upper isolation cylinders 30 are provided on the bottom surface of the upper isolation plate 26. Each upper isolation cylinder 30 corresponds to one of the multiple upper through holes 28. The axis of each upper isolation cylinder 30 coincides with the axis of its corresponding upper through hole 28. The inner diameter of the upper isolation cylinder 30 is not less than the inner diameter of the upper through hole 28, and the axial length of the upper isolation cylinder 30 is less than the axial length of the mounting cylinder 25. Furthermore, multiple lower isolation cylinders 31 are provided on the top surface of the lower isolation plate 27. Each lower isolation cylinder 31 corresponds to one of the multiple lower through holes 29. The axis of each lower isolation cylinder 31 coincides with the axis of its corresponding lower through hole 29. The inner diameter of the lower isolation cylinder 31 is not less than the inner diameter of the lower through hole 29, and the axial length of the lower isolation cylinder 31 is less than the axial length of the mounting cylinder 25.

[0037] To further enhance the isolation effect against moisture, dust, etc., the lower end of the upper isolation cylinder 30 extends to the lower isolation plate 27, forming a gap with the top surface of the lower isolation plate 27 that allows sound to pass through. The upper end of the lower isolation cylinder 31 extends to the upper isolation plate 26, forming a gap with the bottom surface of the upper isolation plate 26 that allows sound to pass through. The bottom end of the upper isolation cylinder 30 is lower than the top end of the lower isolation cylinder 31, so that when pollutants such as moisture and dust in the external environment pass through the isolation assembly 14, they can be blocked by the upper isolation cylinder 30 and the lower isolation cylinder 31, but a channel for sound to pass through is still retained, ensuring the quality of sound received by the receiver 15 and reducing the probability of damage to the receiver 15.

[0038] In one optional implementation of this embodiment, a loudspeaker cavity 7 is further provided inside the explosion-proof cylinder 1. A removable cover plate 6 is provided at the top of the loudspeaker cavity 7. An amplifier 9 is located inside the loudspeaker cavity 7, and a loudspeaker cable hole 5 is provided on the inner wall of the loudspeaker cavity 7 to accommodate the loudspeaker cable. The loudspeaker 9 is electrically connected to the control chip 4 via the loudspeaker cable. Accordingly, to ensure the explosion-proof performance of the loudspeaker telephone, the loudspeaker 9 is placed inside the loudspeaker cavity 7 of the explosion-proof cylinder 1. The loudspeaker 9 can be easily repaired and replaced by removing and installing the cover plate 6 at the top of the loudspeaker cavity 7. The loudspeaker cavity 7 is connected to the receiver cavity 2 through the loudspeaker cable hole 5. The loudspeaker cable passes through the loudspeaker cable hole 5 and is electrically connected to the control chip 4 to realize the transmission of the loudspeaker signal. By placing the control chip 4 and the loudspeaker 9 in different cavities, the explosion within the receiver cavity 2 is controlled within the receiver cavity 2, reducing the probability of damage to the loudspeaker 9.

[0039] Specifically, a loudspeaker hole 10 is provided on the bottom shell 17 of the explosion-proof cylinder 1, and a limiting seat 8 is provided on the bottom surface of the loudspeaker cavity 7, with the limiting seat 8 and the loudspeaker hole 10 arranged opposite each other. The loudspeaker hole 10 is arranged opposite the loudspeaker 9 to facilitate the transmission of the sound emitted by the loudspeaker 9 to the outside of the explosion-proof cylinder 1. The loudspeaker 9 is fixed in the loudspeaker cavity 7 by the limiting seat 8, and the shape of the limiting seat 8 can be adapted to the shape of the bottom end of the loudspeaker 9, making it convenient to install the loudspeaker 9 inside the loudspeaker cavity 7. It should be noted that the loudspeaker, receiver, control chip and their connection method in this embodiment are well known to those skilled in the art, and therefore will not be described in detail in this application.

[0040] In this embodiment, the removable receiver cavity cover facilitates the maintenance and replacement of the control chip and receiver within the receiver cavity. A positioning plate is installed inside the receiver cavity, using its receiving holes to limit the receiver's position, and then a fixing plug secures the receiver, preventing damage from drops. The fixing plug allows for easy maintenance and replacement of the receiver, while also isolating it from the receiver cavity, reducing the probability of damage. The frustum-shaped fixing plug enhances the sealing performance of the receiver cable hole, further preventing damage from explosions. The sealing assembly seals the transmission line extending from the explosion-proof cylinder's side wall, keeping the explosion-proof cylinder closed and ensuring the explosion-proof performance of the loudspeaker. When the pressure plate pushes the pressure ring towards the explosion-proof cylinder, the compression ring presses the side wall of the frustum-shaped sealing plug towards the center, enhancing the sealing of the transmission line hole. The staggered upper and lower through holes on the isolation assembly can block some external moisture and dust, while the upper and lower isolation cylinders can block as much moisture and dust as possible, while maintaining gaps for sound to pass through. This reduces the probability of receiver damage and ensures the quality of voice reception. The amplifier is fixed inside the amplifier cavity by a limiting seat, and the sound emitted by the amplifier can be transmitted to the outside through the amplification port.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mine-use public address telephone, characterized in that: The device includes an explosion-proof cylinder (1) and a sealing assembly; a receiver cavity (2) is provided inside the explosion-proof cylinder (1), and a removable receiver cavity cover plate (3) is provided at the top of the receiver cavity (2); a control chip (4) and a receiver (15) are provided inside the receiver cavity (2), and the receiver (15) is electrically connected to the control chip (4) through a receiver line; a positioning plate (11) is provided on the bottom surface of the receiver cavity (2), and a receiving hole for accommodating the receiver (15) is provided on the positioning plate (11); a fixing plug (16) is also provided at the top of the receiving hole, and the bottom surface of the fixing plug (16) is in contact with the receiver (15), and a receiver line hole for accommodating the receiver line is provided on the fixing plug (16); a receiver hole (13) is provided on the bottom shell (17) of the explosion-proof cylinder (1), and the receiver hole (13) is arranged opposite to the receiver (15); The sealing assembly includes a sealing cylinder (23), a sealing plug (24), a clamping ring (19), and a clamping cover plate (22). The sealing cylinder (23) is disposed on the outer wall of the explosion-proof cylinder (1). The sealing plug (24), the clamping ring (19), and the clamping cover plate (22) are disposed sequentially inside the sealing cylinder (23). The sealing plug (24) is in contact with the outer wall of the explosion-proof cylinder (1). Both the sealing plug (24) and the clamping cover plate (22) are provided with transmission line holes for accommodating the transmission line (21).

2. The mine loudspeaker telephone according to claim 1, characterized in that: The microphone hole (13) is provided with a detachable isolation component (14); the isolation component (14) includes an upper isolation plate (26) and a lower isolation plate (27), the upper isolation plate (26) and the lower isolation plate (27) are connected by a mounting cylinder (25), the upper isolation plate (26) is provided with multiple upper through holes (28), the lower isolation plate (27) is provided with multiple lower through holes, and the upper through holes (28) and lower through holes (29) are arranged alternately.

3. A mine-use public address telephone according to claim 2, characterized in that: The bottom surface of the upper isolation plate (26) is provided with a plurality of upper isolation cylinders (30), and the plurality of upper isolation cylinders (30) are arranged in a one-to-one correspondence with a plurality of upper through holes (28). The axis of each upper isolation cylinder (30) coincides with the axis of the corresponding upper through hole (28). The inner diameter of the upper isolation cylinder (30) is not less than the inner diameter of the upper through hole (28), and the axial length of the upper isolation cylinder (30) is less than the axial length of the mounting cylinder (25).

4. A mine-use public address telephone according to claim 2, characterized in that: The top surface of the lower isolation plate (27) is also provided with a plurality of lower isolation cylinders (31), and the plurality of lower isolation cylinders (31) are arranged in a one-to-one correspondence with a plurality of lower through holes (29). The axis of each lower isolation cylinder (31) coincides with the axis of the corresponding lower through hole (29). The inner diameter of the lower isolation cylinder (31) is not less than the inner diameter of the lower through hole (29), and the axial length of the lower isolation cylinder (31) is less than the axial length of the mounting cylinder (25).

5. A mine-use public address telephone according to claim 1, characterized in that: The fixing plug (16) is frustum-shaped, and the small end of the frustum-shaped fixing plug (16) is in contact with the receiver (15). The receiving hole includes a positioning section and an isolation section. The receiver (15) is set in the positioning section. The inner wall of the isolation section is parallel to the side wall of the fixing plug (16), and the top surface of the fixing plug (16) is flush with the top surface of the positioning plate (11).

6. A mine-use public address telephone according to claim 1, characterized in that: A sealing gasket (12) is also provided between the receiver (15) and the inner wall of the receiving hole.

7. A mine-use public address telephone according to claim 1, characterized in that: The sealing plug (24) is frustum-shaped, and the large end of the frustum-shaped sealing plug (24) is in contact with the outer wall of the explosion-proof cylinder (1). The inner wall of the compression ring (19) is an inner conical surface (20) parallel to the side wall of the sealing plug (24), and a compression ring (18) is provided on the inner conical surface (20).

8. A mine-use public address telephone according to claim 1, characterized in that: The explosion-proof cylinder (1) is also provided with a sound amplification cavity (7). The top of the sound amplification cavity (7) is provided with a detachable sound amplification cavity cover plate (6). The sound amplification cavity (7) is provided with a loudspeaker (9). The inner wall of the sound amplification cavity (7) is provided with a loudspeaker wire hole (5) for accommodating the loudspeaker wire. The loudspeaker (9) is electrically connected to the control chip (4) through the loudspeaker wire.

9. A mine-use public address telephone according to claim 8, characterized in that: The explosion-proof cylinder (1) is also provided with a sound amplification hole (10) on the bottom shell (17) and a limiting seat (8) on the bottom surface of the sound amplification cavity (7), and the limiting seat (8) and the sound amplification hole (10) are arranged opposite to each other.

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