Risk monitoring and early warning system based on industrial enterprise safety production

Abstract

The invention relates to the technical field of risk early warning, and particularly discloses an industrial enterprise safety production-based risk monitoring and early warning system, which comprises a fixed guide rail fixed at the upper end of the side wall of a workshop, a movable frame is slidably mounted on the fixed guide rail, and the upper end and the lower end of the movable frame are mounted together with the fixed guide rail through two fixing mechanisms. Translation motors are fixed to the inner sides of the upper ends of the fixed guide rails, driving gears are fixed to the translation motors, and racks in meshing transmission with the driving gears are fixed to the fixed guide rails. The device has the beneficial effects that the environment, the temperature and the air quality in a factory can be monitored through a camera, an infrared temperature measurement sensor and a gas analyzer, potential safety hazards in a workshop can be conveniently found in time, and safe production of enterprises is guaranteed; and floating dust on the surface of the camera can be cleaned through the dust removal system, meanwhile, the cleaned floating dust can be treated and prevented from drifting into a factory area again, the air quality is guaranteed, and the cleaned dust is prevented from drifting onto the camera again.

Description

Technical Field

[0001] The present invention relates to the technical field of risk early warning, and in particular to a risk monitoring and early warning system based on production safety of industrial enterprises. Background Art

[0002] Safety in production is of paramount importance. With the development of the industrial economy, my country has entered a new stage of development. The development foundation is more solid, the development conditions have changed profoundly, and further development faces new opportunities and challenges. The main responsibilities of enterprises are becoming increasingly clear, and the requirements for safety in production are no longer an afterthought. Instead, the safety control checkpoints are moved forward, with risk control and risk warning prediction as the goal, and safety supervision work is done well. Due to the large scale of enterprises, it is inconvenient to monitor. For industrial production safety risk warning, the addition of wireless signal transmission technology has effectively improved the warning and prediction level.

[0003] Traditional risk monitoring mainly relies on cameras installed at different locations within the factory. However, there is a lot of dust inside the enterprise. After long-term use, dust is easily stuck to the surface of the camera, affecting the shooting quality. When a small safety accident occurs or when the accident point is small and difficult to see at the beginning of the accident, it is difficult for staff to discover it in time through the camera, and timely warning and processing cannot be carried out. Summary of the invention

[0004] The present invention proposes a risk monitoring and early warning system based on industrial enterprise safety production in order to solve the above problems.

[0005] The technical solution of the present invention is achieved in this way:

[0006] The risk monitoring and early warning system based on the safe production of industrial enterprises comprises a fixed rail fixed on the upper end of a workshop side wall, a movable frame is slidably mounted on the fixed rail, the upper and lower ends of the movable frame are mounted together with the fixed rail through two fixing mechanisms, a translation motor is fixed to the inner side of the upper end of the fixed rail, a driving gear is fixed to the translation motor, a rack meshing with the driving gear is fixed to the fixed rail, the rack is fixed along the length direction of the fixed rail, a conductive rail fixed along the length direction is fixed to the lower end of the fixed rail, a sliding conductive device slidingly matched with the conductive rail is fixed to the lower end of the movable frame, and the sliding conductive device is spaced from the fixed rail to the movable rail. The distance from the conductive rail is adjustable, a front fixing plate is fixed on the outer wall of the movable frame, a control box and a gas analyzer are fixed on the upper surface of the front fixing plate, a rotating motor is fixed on the lower surface of the front fixing plate, a camera is rotatably mounted on the rotating motor, a dust removal system for removing dust on the camera lens is fixed on the outer wall of the movable frame, a terminal block electrically connected to the sliding conductive device is fixed in the control box, the control box is electrically connected to the rotating motor, the camera, the translation motor, the dust removal system and the gas analyzer, and a wireless communication module connected to the remote monitoring host signal is fixed inside the control box.

[0007] Furthermore, the fixing mechanism includes an adjusting screw fixed to the fixed guide rail through threads, a fixing frame is rotatably mounted on the lower end of the adjusting screw, and at least one track wheel in rolling contact with the fixed guide rail is fixed on the fixing frame.

[0008] Furthermore, the conductive rail includes an insulating seat fixed together with the fixed guide rail, at least two grooves are formed on the insulating seat along the length direction, a conductive plate is fixed in the groove, the sliding conductive device includes a support arm fixed together with the movable frame, an insulating guide sleeve is fixed on the support arm and is installed in cooperation with the conductive plate, each of the insulating guide sleeves corresponds to one of the conductive plates, a carbon brush is slidably installed on the insulating guide sleeve, an end of the carbon brush is in contact with the conductive plate, a compression spring is nested at one end of the carbon brush close to the support arm, the compression spring is slidably installed in the insulating guide sleeve, a conductive needle with one end inserted into the interior of the carbon brush is fixed on the support arm, and the conductive needle is slidably installed in cooperation with the carbon brush.

[0009] Furthermore, the dust removal system includes a dust removal mechanism and a dust removal box fixed on the outer wall of the movable frame, the dust removal box is located above the front fixed plate, and an air outlet is opened on the side wall of the dust removal box. A filter is fixed at a position corresponding to the air outlet inside the dust removal box, the dust removal mechanism is located below the front fixed plate and corresponds to the camera setting, a suction pump is fixed on the lower surface of the front fixed plate, the air inlet end of the suction pump is connected to the dust removal mechanism through a pipe, and the air outlet end of the suction pump is connected to the dust removal box through a pipe.

[0010] Furthermore, the dust removal mechanism includes a transmission box fixed on the movable frame, a dust removal motor is fixed on the outer wall of the transmission box, a power shaft of the dust removal motor is inserted into the transmission box and fixed with a transmission gear, the transmission box is formed with a fixing hole at a position close to the camera, a dust removal disk is fixed in the fixing hole by means of a bearing, the dust removal disk is inserted into the transmission box, and a gear ring is formed on the outer wall of one end of the transmission box that meshes with the transmission gear of the dust removal motor, a ventilation groove is formed on the outer end surface of the dust removal disk that penetrates into the inner cavity of the transmission box, and a plurality of dust removal brushes for removing dust are fixed on the outer end surface of the dust removal disk.

[0011] Furthermore, a protective cover is fixed to the upper end of the fixed guide rail along the length direction, and the protective cover covers the sliding track of the movable frame.

[0012] Furthermore, an infrared temperature sensor is fixed on the camera, and the infrared temperature sensor is electrically connected to the control box.

[0013] Furthermore, a speaker is fixed on the upper surface of the front fixing plate, and the speaker is electrically connected to the control box.

[0014] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: the environment, temperature and air quality in the factory area can be monitored by means of cameras, infrared temperature sensors and gas analyzers, so as to timely discover potential safety hazards in the workshop and ensure safe production of the enterprise; the dust removal system can be used to clean the floating dust on the surface of the camera, and the removed floating dust can be processed to prevent it from floating back into the factory area, thereby ensuring the air quality and preventing the removed dust from falling on the camera again; power transmission is carried out by combining carbon brushes with conductive plates, which can facilitate power supply when the device is moved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 is a stereogram of the present invention;

[0017] Figure 2 It is a front view of the present invention;

[0018] Figure 3 It is a left side view of the present invention;

[0019] Figure 4 It is a right side view of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the sliding conductive device of the present invention;

[0021] Figure 6 It is a front view of the dust removal mechanism of the present invention;

[0022] Figure 7 is a cross-sectional view of the dust removal mechanism of the present invention;

[0023] Figure 8 It is a circuit structure block diagram of the present invention.

[0024] The following are the descriptions of the reference numerals:

[0025] 1. Fixed guide rail; 2. Movable frame; 3. Fixing mechanism; 31. Adjusting screw; 32. Fixed frame; 33. Track wheel; 4. Front fixing plate; 5. Rotating motor; 6. Camera; 7. Control box; 8. Sliding conductive device; 81. Support arm; 82. Insulating guide sleeve; 83. Carbon brush; 84. Conductive needle; 85. Compression spring; 9. Conductive rail; 91. Insulating seat; 92. Conductive plate; 10. Translation motor; 11. Driving gear; 12. Dust removal system; 121. Dust removal mechanism; 1211. Transmission box; 1212. Dust removal motor; 1213. Dust removal disc; 1214. Breathing groove; 1215. Dust removal brush; 1216. Gear ring; 122. Suction pump; 123. Dust removal box; 13. Infrared temperature sensor; 14. Gas analyzer; 15. Rack; 16. Protective cover; 17. Speaker. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-Figure 8As shown, the risk monitoring and early warning system based on the safe production of industrial enterprises includes a fixed guide rail 1 fixed on the upper end of the side wall of the workshop. The fixed guide rail 1 can be fixed on the outer wall of the building to monitor the external environment of the workshop, and can also be fixed on the inner wall of the building to monitor the internal situation of the workshop. It can be fixed horizontally or vertically. A movable frame 2 is slidably installed on the fixed guide rail 1. The upper and lower ends of the movable frame 2 are installed together with the fixed guide rail 1 through two fixing mechanisms 3. A position-adjustable translation motor 10 is fixed on the inner side of the upper end of the fixed guide rail 1, and a driving gear 11 is fixed on the translation motor 10. A rack 15 meshing with a driving gear 11 is fixed on the fixed guide rail 1. The rack 15 is fixed along the length direction of the fixed guide rail 1. The translation motor 10 drives the driving gear 11 to rotate, which can drive the movable frame 2 to move along the length direction of the fixed guide rail 1, so as to drive the camera 6 fixed thereon to move, monitor different positions, or conduct a close-up view of the potential safety hazards found. A conductive rail 9 fixed along the length direction is fixed at the lower end of the fixed guide rail 1. The conductive rail 9 is fixed at the lower end of the fixed guide rail 1, which can reduce dust from entering the conductive rail 9 and improve power supply. The movable frame 2 is provided with a sliding conductive device 8 that slides with the conductive rail 9, and the distance between the sliding conductive device 8 and the conductive rail 9 is adjustable, so as to ensure that the power-consuming equipment fixed thereon can be powered normally when the movable frame 2 moves. A front fixed plate 4 is fixed on the outer wall of the movable frame 2, and a control box 7 and a gas analyzer 14 are fixed on the upper surface of the front fixed plate 4. A microprocessor, a wireless communication module and a wiring socket are fixed inside the control box 7. The microprocessor processes data and transmits information to the remote monitoring host by using the wireless communication module. The wiring socket is used to facilitate the circuit connection of the power-consuming equipment. The gas analyzer 14 includes a detection tube and a drainage fan fixed at the tail of the detection tube. One or more of a carbon dioxide concentration detection sensor, a sulfur dioxide concentration detection sensor, a smoke sensor, and a dust concentration detection sensor are fixed on the inner wall of the detection tube. The drainage fan draws air into the detection tube for analysis and detection. The model of the carbon dioxide concentration detection sensor is NA80, the model of the sulfur dioxide concentration detection sensor is S02-B4, the model of the smoke sensor is KGQ-1, and the model of the dust concentration detection sensor is GP2Y1010AUOF SHARP, by analyzing the gas, it is convenient to find the fire hazard in time. A rotating motor 5 is fixed on the lower surface of the front fixed plate 4, and a camera 6 is rotatably installed on the rotating motor 5. The shooting angle of the camera 6 can be adjusted by driving the rotating motor 5 to rotate, which is convenient for adjusting the monitoring area. The monitoring range can be expanded by setting the rotating motor 5 to rotate within a fixed angle. A dust removal system 12 for removing dust from the lens of the camera 6 is fixed on the outer wall of the movable frame 2 to prevent dust from covering the lens of the camera 6 and affecting the monitoring effect. A wiring socket electrically connected to the sliding conductive device 8 is fixed in the control box 7. The control box 7 is electrically connected to the rotating motor 5, the camera 6, the translation motor 10, the dust removal system 12, and the gas analyzer 14.A wireless communication module connected to the remote monitoring host signal is fixed inside the control box 7.

[0028] In this embodiment, the fixing mechanism 3 includes an adjusting screw 31 fixed to the fixed guide rail 1 by a thread, and a fixing frame 32 is rotatably mounted on the lower end of the adjusting screw 31. At least one track wheel 33 in rolling contact with the fixed guide rail 1 is fixed on the fixing frame 32. By adjusting the distance between the upper and lower fixing mechanisms 3 and the fixed guide rail 1, the distance between the sliding conductive device 8 and the conductive rail 9 can be adjusted. The coordinated installation of the track wheel 33 and the fixed guide rail 1 can reduce the friction when the fixed guide rail 1 slides.

[0029] In this embodiment, the conductive rail 9 includes an insulating seat 91 fixed to the fixed guide rail 1, and at least two grooves are formed on the insulating seat 91 along the length direction, and a conductive plate 92 is fixed in the groove. The sliding conductive device 8 includes a support arm 81 fixed to the movable frame 2, and an insulating guide sleeve 82 is fixed on the support arm 81 and is installed in cooperation with the conductive plate 92. Each insulating guide sleeve 82 corresponds to a conductive plate 92, and a carbon brush 83 is slidably installed on the insulating guide sleeve 82. The end of the carbon brush 83 is in contact with the conductive plate 92. A compression spring 85 is nested at one end of the carbon brush 83 close to the support arm 81, and the compression spring 85 is slidably installed in the insulating guide sleeve 82. A conductive needle 84 with one end inserted into the carbon brush 83 is fixed on the support arm 81, and the conductive needle 84 is slidably installed with the carbon brush 83. Under the action of the compression spring 85, the carbon brush 83 can be guaranteed to always be in contact with the conductive plate 92, and the conductive needle 84 is in contact with the carbon brush 83, so that the current can be transmitted stably.

[0030] In this embodiment, the dust removal system 12 includes a dust removal mechanism 121 and a dust removal box 123 fixed on the outer wall of the movable frame 2. The dust removal box 123 is located above the front fixed plate 4. An air outlet is opened on the side wall of the dust removal box 123. A filter is fixed at the position corresponding to the air outlet inside the dust removal box 123. The dust removal mechanism 121 is located below the front fixed plate 4 and is arranged corresponding to the camera 6. A suction pump 122 is fixed to the lower surface of the front fixed plate 4. The air inlet end of the suction pump 122 is connected to the dust removal mechanism 121 through a pipe, and the air outlet end of the suction pump 122 is connected to the dust removal box 123 through a pipe. The suction pump 122 can be used to suck away the dust removed from the surface of the camera 6 to prevent dust diffusion from affecting the detection result of the dust concentration detection sensor inside the gas analyzer 14. At the same time, it can prevent the removed dust from falling back on the camera 6 or the dust from freely increasing the dust concentration in the air.

[0031] In this embodiment, the dust removal mechanism 121 includes a transmission box 1211 fixed on the movable frame 2, a dust removal motor 1212 is fixed on the outer wall of the transmission box 1211, a power shaft of the dust removal motor 1212 is inserted into the transmission box 1211 and fixed with a transmission gear, a fixing hole is formed at a position of the transmission box 1211 near the camera 6, a dust removal disc 1213 is fixed in the fixing hole by a bearing, the dust removal disc 1213 is inserted into the transmission box 1211, and a gear ring 1216 meshing with the transmission gear of the dust removal motor 1212 is formed on the outer wall of one end, and a ventilation groove 1214 is formed on the outer end surface of the dust removal disc 1213 that penetrates the inner cavity of the transmission box 1211 A plurality of dust removal brushes 1215 for removing dust are fixed on the outer end surface of the dust removal disk 1213. The dust removal brush 1215 is any one of rubber bristles and animal hair. When the camera 6 faces the dust removal disk 1213, the dust removal motor 1212 and the suction pump 122 are started. The dust removal motor 1212 drives the dust removal disk 1213 to rotate and then drives the dust removal brush 1215 to sweep the dust on the lens of the camera 6. The swept dust is sucked into the dust removal box 123 under the action of the suction pump 122, and the clean air is discharged again after purification. The dust remains in the dust removal box 123. The dust in the dust removal box 123 can be cleaned regularly to ensure the dust removal effect.

[0032] In this embodiment, a protective cover 16 is fixed to the upper end of the fixed guide rail 1 along the length direction. The protective cover 16 covers the sliding track of the movable frame 2 to prevent debris from falling onto the rack 15 or the movable frame 2 and reduce dust deposition.

[0033] In this embodiment, an infrared temperature sensor 13 is fixed on the camera 6, and the infrared temperature sensor 13 is electrically connected to the control box 7. The model of the infrared temperature sensor 13 is MLX90614, and the measurable range is -70°C to 380°C. When the temperature of the measured object exceeds the measuring range, there is a potential fire hazard, and the control box 7 can be used to issue an alarm reminder.

[0034] In this embodiment, a speaker 17 is fixed on the upper surface of the front fixed plate 4, and the speaker 17 is electrically connected to the control box 7. The staff can remotely broadcast the location content, safety reminders and notifications of safety hazards through the speaker 17, so that nearby staff can deal with the safety hazards or escape in time.

[0035] The working principle of the present invention is as follows: when in use, the device is fixed on the inner and outer walls of the workshop building, and different places inside and outside the workshop can be monitored. The staff can view the specific conditions of the monitoring area on the remote monitoring host. The gas analyzer 14 can monitor the air quality in the monitoring area and is used to monitor the amount of carbon dioxide and sulfur dioxide in the air in the workshop, so as to facilitate timely detection and send alarm information to the monitoring host through the control box 7 when a fire occurs. The infrared temperature sensor 13 is used to monitor the temperature of the monitoring area. When the temperature of the monitoring area is too high and it is easy to cause a fire hazard, an alarm message can also be sent to the monitoring host through the control box 7. At regular intervals, The rotating motor 5 can be controlled to drive the camera 6 to rotate so that the lens of the camera 6 faces the dust removal disk 1213, and then the dust removal motor 1212 and the suction pump 122 are started. The dust removal motor 1212 drives the dust removal disk 1213 to rotate to remove the floating dust on the surface of the camera 6 lens. The suction pump 122 is started to suck the cleaned floating dust into the dust removal box 123 and discharge it again after purification, so as to ensure the cleanliness of the camera 6 lens. After cleaning, the camera 6 returns to the original angle for monitoring. When a safety accident occurs, the staff of the monitoring host can remotely use the speaker 17 to issue warning information and evacuation notices, so as to timely discover safety accidents and reduce the losses caused by safety accidents.

[0036] The circuit connection involved in the present invention is a common method used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, and it belongs to the widely used existing technology.

[0037] Components not described in detail herein are prior art.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The risk monitoring and early warning system based on industrial enterprise production safety is characterized by: The invention comprises a fixed guide rail (1) fixed to the upper end of a workshop side wall, a movable frame (2) being slidably mounted on the fixed guide rail (1), the upper and lower ends of the movable frame (2) being mounted together with the fixed guide rail (1) through two fixing mechanisms (3), a translation motor (10) being fixed to the inner side of the upper end of the fixed guide rail (1), a driving gear (11) being fixed to the translation motor (10), a rack (15) being fixed on the fixed guide rail (1) and meshing with the driving gear (11) for transmission, the rack (15) being fixed along the length direction of the fixed guide rail (1), a conductive rail (9) being fixed along the length direction at the lower end of the fixed guide rail (1), a sliding conductive device (8) being fixed at the lower end of the movable frame (2) and being slidably matched with the conductive rail (9), the sliding conductive device (8) being at a distance from the conductive rail (9) The movable frame (2) is adjustable in distance. A front fixing plate (4) is fixed on the outer wall of the movable frame (2). A control box (7) and a gas analyzer (14) are fixed on the upper surface of the front fixing plate (4). A rotating motor (5) is fixed on the lower surface of the front fixing plate (4). A camera (6) is rotatably mounted on the rotating motor (5). A dust removal system (12) for removing dust from the lens of the camera (6) is fixed on the outer wall of the movable frame (2). A wiring socket electrically connected to the sliding conductive device (8) is fixed in the control box (7). The control box (7) is electrically connected to the rotating motor (5), the camera (6), the translation motor (10), the dust removal system (12) and the gas analyzer (14). A wireless communication module connected to the remote monitoring host signal is fixed inside the control box (7).

2. The risk monitoring and early warning system based on industrial enterprise production safety according to claim 1 is characterized by: The fixing mechanism (3) comprises an adjusting screw (31) fixed to the fixing guide rail (1) by means of a thread, a fixing frame (32) being rotatably mounted on the lower end of the adjusting screw (31), and at least one track wheel (33) being in rolling contact with the fixing guide rail (1) being fixed on the fixing frame (32).

3. The risk monitoring and early warning system based on industrial enterprise production safety according to claim 1 is characterized by: The conductive rail (9) comprises an insulating seat (91) fixed together with the fixed guide rail (1), the insulating seat (91) is formed with at least two grooves along the length direction, and a conductive plate (92) is fixed in the groove. The sliding conductive device (8) comprises a support arm (81) fixed together with the movable frame (2), and an insulating guide sleeve (82) is fixed on the support arm (81) and is mounted in cooperation with the conductive plate (92). Each insulating guide sleeve (82) corresponds to one of the conductive plates (9). 2), the insulating guide sleeve (82) is slidably mounted with a carbon brush (83), the end of the carbon brush (83) is in contact with the conductive plate (92), a compression spring (85) is nested at one end of the carbon brush (83) close to the support arm (81), the compression spring (85) is slidably mounted in the insulating guide sleeve (82), a conductive needle (84) with one end inserted into the interior of the carbon brush (83) is fixed on the support arm (81), and the conductive needle (84) is slidably mounted with the carbon brush (83).

4. The risk monitoring and early warning system based on industrial enterprise production safety according to any one of claims 1 to 3, characterized in that: The dust removal system (12) comprises a dust removal mechanism (121) and a dust removal box (123) fixed on the outer wall of the movable frame (2); the dust removal box (123) is located above the front fixing plate (4); an air outlet is provided on the side wall of the dust removal box (123); a filter is fixed inside the dust removal box (123) at a position corresponding to the air outlet; the dust removal mechanism (121) is located below the front fixing plate (4) and is arranged corresponding to the camera (6); a suction pump (122) is fixed on the lower surface of the front fixing plate (4); an air inlet end of the suction pump (122) is connected to the dust removal mechanism (121) through a pipeline; and an air outlet end of the suction pump (122) is connected to the dust removal box (123) through a pipeline.

5. The risk monitoring and early warning system based on industrial enterprise production safety according to claim 4 is characterized by: The dust removal mechanism (121) comprises a transmission box (1211) fixed on the movable frame (2); a dust removal motor (1212) is fixed on the outer wall of the transmission box (1211); a power shaft of the dust removal motor (1212) is inserted into the transmission box (1211) and fixed with a transmission gear; a fixing hole is formed at a position of the transmission box (1211) close to the camera (6); a dust removal disc (1213) is fixed in the fixing hole by means of a bearing; a gear ring (1216) is formed on the outer wall of one end of the dust removal disc (1213) inserted into the transmission box (1211) and meshed with the transmission gear of the dust removal motor (1212); a ventilation groove (1214) is formed on the outer end surface of the dust removal disc (1213) and penetrates into the inner cavity of the transmission box (1211); and a plurality of dust removal brushes (1215) for removing dust are fixed on the outer end surface of the dust removal disc (1213).

6. The risk monitoring and early warning system based on industrial enterprise production safety according to claim 5 is characterized by: A protective cover (16) is fixed to the upper end of the fixed guide rail (1) along the length direction, and the protective cover (16) covers the upper part of the sliding track of the movable frame (2).

7. The risk monitoring and early warning system based on industrial enterprise production safety according to claim 5 is characterized by: An infrared temperature sensor (13) is fixed on the camera (6), and the infrared temperature sensor (13) is electrically connected to the control box (7).

8. The risk monitoring and early warning system based on industrial enterprise production safety according to claim 5 is characterized by: A loudspeaker (17) is fixed on the upper surface of the front fixing plate (4), and the loudspeaker (17) is electrically connected to the control box (7).

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