Network security alarm

Abstract

The utility model relates to the technical field of network security, and discloses a network security alarm, which comprises a fixed bottom plate, an upper box body and a servo motor, the middle part of the upper end of the fixed bottom plate is fixedly connected with a lower box body, one side of the outer wall of the front end of the lower box body is provided with a water tank, and one side of the water tank is provided with a water pump. A cooling pipe is arranged in the lower box body, a water outlet of the water pump is in through connection with the interior of the cooling pipe through a pipeline, a water inlet of the water pump is in through connection with the interior of the water tank through a pipeline, and the rear end of the cooling pipe is in through connection with the interior of the water tank. According to the utility model, through the layout of the water tank, the water pump cooling system and the cooling pipe, the electronic components in the lower box body are ensured to keep stable operation in a high-temperature environment, overheating damage is prevented, the service life is prolonged, in addition, the fan blades driven by the servo motor provide an additional heat dissipation function, and the service life is prolonged. The design of the transmission gear and the toothed belt enables the motor to accurately control the rotation of the fan blades, thereby improving the system efficiency and accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of network security, in particular to a network security alarm. Background Art

[0002] A network security alarm is a device or software used to monitor network activity and detect potential threats or attacks. It is usually installed in the network and can monitor network traffic in real time, identify abnormal behavior, and issue an alarm when potential security risks are detected. Network security alarms can help organizations respond to threats in a timely manner and take measures to protect their networks and data.

[0003] Traditional network security alarms usually rely solely on the cooling system to dissipate heat from the device, which may not be able to effectively remove heat from the inside of the device, especially in high-temperature environments. Insufficient heat dissipation efficiency may cause the internal temperature of the device to rise, thereby increasing the risk of damage to electronic components, thereby increasing maintenance costs and downtime. In addition, the connection between the box bodies of traditional network security alarms is usually only fixed by fixing bolts. Relying solely on the connection of fixing bolts may not be enough to provide sufficient stability, especially when the device may encounter vibration or impact during operation. The bolt connection may loosen, causing the relative position between the upper box body and the lower box body to change.

[0004] Therefore, those skilled in the art provide a network security alarm to solve the problems raised in the above background technology. Utility Model Content

[0005] The purpose of the present utility model is to solve the shortcomings existing in the prior art, and to propose a network security alarm, which ensures that the electronic components inside the lower box body maintain stable operation in a high temperature environment through the layout of the water tank and water pump cooling system and the cooling pipe, prevents overheating damage, and extends the service life. In addition, the fan blades driven by the servo motor provide additional heat dissipation function, and the design of the transmission gear and toothed belt enables the motor to accurately control the rotation of the fan blades, improving the efficiency and accuracy of the system. The positioning block and the card block between the upper box body and the lower box body are snapped together, and additional stability is provided by the reset spring. The design of the fixing parts and fixing bolts further enhances the structural stability, reduces vibration and impact during operation, and ensures the stability and reliability of the equipment under various working conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A network security alarm comprises a fixed base plate, an upper box body and a servo motor, wherein the middle part of the upper end of the fixed base plate is fixedly connected to the lower box body, a water tank is provided on one side of the outer wall of the front end of the lower box body, a water pump is provided on one side of the water tank, a cooling pipe is provided inside the lower box body, the water outlet of the water pump is connected to the inside of the cooling pipe through a pipe, the water inlet of the water pump is connected to the inside of the water tank through a pipe, the rear end of the cooling pipe is connected to the inside of the water tank, a protective shell is fixedly connected to one side of the outer wall of the upper end of the upper box body, and the servo motor is fixedly connected to the upper end of the upper box body. Inside the protective shell, the output end of the servo motor passes through the upper box body to the interior of the upper box body and is fixedly connected to the first connecting rod, the middle part of the other side of the top surface of the upper box body is rotatably connected to the second connecting rod, the outer walls of the first connecting rod and the second connecting rod are both sleeved with transmission gears, the outer wall gears of the transmission gears are engaged with a toothed belt, the transmission gears and the toothed belts are both located inside the upper box body, the first connecting rod and the second connecting rod are located inside the upper box body, the lower ends of the first connecting rod and the second connecting rod both pass through the upper box body to the outside of the lower end of the upper box body and are fixedly connected to the fan blades;

[0008] Through the above technical solution, the cooling system composed of a water tank and a water pump, and the effective layout of the cooling pipes, can effectively dissipate heat from the electronic components inside the lower box, which helps to maintain the stable operation of the equipment, especially in high temperature environments, and can prevent the equipment from being damaged due to overheating, thereby extending the service life of the equipment. In addition, the fan blades are driven by a servo motor to provide additional heat dissipation function, further ensuring the stability of the equipment in high temperature environments. The design of the transmission gear and toothed belt enables the servo motor to simultaneously control the rotation of the first connecting rod and the second connecting rod and then control the rotation of the fan blades, thereby improving the efficiency and accuracy of the entire system. Through these designs, the network security alarm can maintain stable operation in high temperature environments, effectively preventing the equipment from being damaged due to overheating, while improving the efficiency and accuracy of the system, and ensuring the stability and reliability of the equipment under various working conditions.

[0009] The locking block is fixedly secured to the center of the locking cam and secured to the cam by a spring, and the locking block is secured to the center of the locking cam by a spring.

[0010] When the locking block moves to the end of the inner wall of the locking groove away from the center of the mounting block, the locking block is no longer subjected to force, and the reset spring resets the locking block to engage with the inner wall of the locking groove, so that the upper box body can be firmly fixed on the lower box body. The use of the reset spring provides additional stability to ensure that the equipment will not loosen during movement or use. At the same time, it can also absorb and buffer the vibration caused by movement or external impact, protect internal sensitive components, and extend the service life of the equipment. By fixing the fixing parts in the middle of the front and rear end outer walls of the upper and lower box bodies and fixing them with fixing bolts, the structural stability of the entire device can be further enhanced. This design further ensures a firm connection between the upper and lower box bodies, and reduces loosening or displacement caused by vibration or impact during operation.

[0011] Furthermore, the lower end of the water tank is fixedly connected to the upper end of the fixed bottom plate, and the lower end of the water pump is fixedly connected to the upper end of the fixed bottom plate;

[0012] Through the above technical solution, the structural stability of the entire device is enhanced by the fixed connection between the water tank and the water pump and the fixed bottom plate.

[0013] Furthermore, a processor device, a speaker and an alarm device are provided inside the lower box body;

[0014] Through the above technical solution, the processor device is responsible for processing the data input and output of the alarm, including analyzing network traffic, detecting abnormal behavior, etc., to ensure that the alarm can respond to potential security threats in a timely manner. The speaker is used to issue a sound alarm. When a security threat is detected or an emergency response is required, the speaker will issue an alarm sound to alert the operator. The alarm device is used to display alarm information or status, such as alarm level, threat type, etc., so that the operator can quickly understand the alarm information.

[0015] Furthermore, a temperature sensor is provided inside the lower box body;

[0016] Through the above technical solution, the temperature of the equipment can be controlled through the monitoring data of the temperature sensor, such as starting or adjusting the cooling system to prevent the equipment from overheating. In addition, the temperature sensor can be used as part of the early warning mechanism. When an abnormal temperature is detected, an alarm can be issued in time to remind the operator to take measures to avoid potential equipment failure or damage.

[0017] Furthermore, a power supply device and a backup power supply are provided inside the lower box body;

[0018] Through the above technical solution, redundant power supply is provided by the setting of power supply unit and backup power supply. Even if the main power supply fails, the backup power supply can continue to power the equipment, ensuring the continuous operation of the equipment and reducing the downtime caused by power problems.

[0019] Furthermore, a power socket is provided in the middle of the outer wall of one side of the lower box body;

[0020] Through the above technical solution, the design of the power socket allows the device to be easily connected to the power supply without opening the device casing or disassembling any components.

[0021] Furthermore, a plurality of ventilation holes are provided at the front and rear ends of the outer wall of the lower box body;

[0022] Through the above technical solution, air circulation is allowed through the air vents, which helps to dissipate heat. When the cooling system is working, the airflow generated by the heat dissipation fan blades can be discharged through the air vents, further accelerating heat dissipation and improving the heat dissipation effect.

[0023] The utility model has the following beneficial effects:

[0024] 1. The utility model proposes a network security alarm, which can effectively dissipate heat for electronic components inside the lower box body through a cooling system consisting of a water tank and a water pump, and an effective layout of cooling pipes, which helps to maintain stable operation of the equipment, especially in high temperature environments, and can prevent the equipment from being damaged due to overheating, thereby extending the service life of the equipment. In addition, the fan blades are driven by a servo motor to provide additional heat dissipation function, further ensuring the stability of the equipment in high temperature environments. The design of the transmission gear and toothed belt enables the servo motor to simultaneously control the rotation of the first connecting rod and the second connecting rod and then control the rotation of the fan blades, thereby improving the efficiency and accuracy of the entire system. Through these designs, the network security alarm can maintain stable operation in high temperature environments, effectively prevent the equipment from being damaged due to overheating, and at the same time improve the efficiency and accuracy of the system, ensuring the stability and reliability of the equipment under various working conditions.

[0025] When the locking block moves to the end where the inner wall of the locking groove is away from the center of the mounting block, the locking block is no longer subjected to force, and the reset spring resets the locking block to engage with the inner wall of the locking groove, so that the upper box body can be firmly fixed to the lower box body. The use of the reset spring provides additional stability to ensure that the equipment will not loosen during movement or use. At the same time, it can also absorb and buffer the vibration caused by movement or external impact, protect internal sensitive components, and extend the service life of the equipment. By fixing the fixing parts in the middle of the front and rear end outer walls of the upper and lower box bodies and fixing them with fixing bolts, the structural stability of the entire device can be further enhanced. This design further ensures the firm connection between the upper and lower box bodies, and reduces loosening or displacement caused by vibration or impact during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an axonometric diagram of a network security alarm proposed by the utility model;

[0027] Figure 2 This is an exploded diagram of a network security alarm proposed by the utility model;

[0028] Figure 3 This is a partial exploded view of a network security alarm proposed by the utility model;

[0029] Figure 4 This is a partial structural axonometric diagram of a network security alarm proposed by the utility model;

[0030] Figure 5This is a partial structural exploded diagram of a network security alarm proposed by the utility model;

[0031] Figure 6 This is a partial axonometric diagram of a network security alarm proposed by the utility model.

[0032] Legend:

[0033] 1. Fixed base plate; 101. Water tank; 102. Water pump; 103. Cooling pipe;

[0034] 2. Lower box; 201. Power socket; 202. Ventilation hole; 203. Groove; 204. Snap-in slot; 205. Processor unit; 206. Speaker; 207. Temperature sensor; 208. Alarm device; 209. Power supply unit; 210. Backup power supply;

[0035] 3. Upper box body; 301. Protective shell; 302. Positioning block; 303. Clamping block; 304. Fixing piece; 305. Slide groove; 306. Return spring;

[0036] 4. Servo motor; 401. First connecting rod; 402. Second connecting rod; 403. Transmission gear; 404. Toothed belt; 405. Fan blade. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the specific embodiments of the present invention to clearly and completely describe the technical solutions in the specific embodiments of the present invention. Obviously, the specific embodiments described are only part of the specific embodiments of the present invention, not all of the specific embodiments. Based on the specific embodiments of the present invention, all other specific embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Reference Figure 2 、 Figure 3 and Figure 4The utility model provides a specific embodiment: a network security alarm, including a fixed base plate 1, an upper box body 3 and a servo motor 4, the middle part of the upper end of the fixed base plate 1 is fixedly connected to the lower box body 2, a water tank 101 is provided on one side of the front end outer wall of the lower box body 2, a water pump 102 is provided on one side of the water tank 101, a cooling pipe 103 is provided inside the lower box body 2, the water outlet of the water pump 102 is connected to the inside of the cooling pipe 103 through a pipe, the water inlet of the water pump 102 is connected to the inside of the water tank 101 through a pipe, and the rear end of the cooling pipe 103 is connected to the water tank 10 1 is connected internally, a protective shell 301 is fixedly connected to one side of the outer wall of the upper end of the upper box body 3, the servo motor 4 is located inside the protective shell 301, the output end of the servo motor 4 passes through the upper box body 3 to the interior of the upper box body 3 and is fixedly connected to the first connecting rod 401, and the middle part of the other side of the top surface of the upper box body 3 is rotatably connected to the second connecting rod 402, the outer walls of the first connecting rod 401 and the second connecting rod 402 are both sleeved with a transmission gear 403, the outer wall gear of the transmission gear 403 is meshed with a toothed belt 404, the transmission gear 403 and the toothed belt 404 are both located inside the upper box body 3, and the first connecting rod 401 and the second connecting rod 402 are rotatably connected. A connecting rod 401 and a second connecting rod 402 are located inside the upper box body 3. The lower ends of the first connecting rod 401 and the second connecting rod 402 pass through the upper box body 3 to the outside of the lower end of the upper box body 3 and are fixedly connected with fan blades 405. Through the cooling system composed of the water tank 101 and the water pump 102, and the effective layout of the cooling pipe 103, the electronic components inside the lower box body 2 can be effectively dissipated, which helps to maintain the stable operation of the equipment, especially in high temperature environments, it can prevent the equipment from being damaged by overheating, thereby extending the service life of the equipment. In addition, the fan blades 405 are driven by the servo motor to provide additional heat dissipation function, further ensuring the stability of the equipment in high temperature environments. The design of the transmission gear 403 and the toothed belt 404 enables the servo motor 4 to simultaneously control the rotation of the first connecting rod 401 and the second connecting rod 402 and then control the rotation of the fan blades 405, thereby improving the efficiency and accuracy of the entire system. Through these designs, the network security alarm can maintain stable operation in high temperature environments, effectively preventing the equipment from being damaged by overheating, while improving the efficiency and accuracy of the system, and ensuring the stability and reliability of the equipment under various working conditions.

[0039] Reference Figure 5 and Figure 6302, and the like. The upper and lower parts of the box body 3 are fixedly connected to the middle of both sides of the lower surface of the upper box body 3. The front and rear ends of the outer wall of the positioning block 302 are provided with a sliding groove 305. The end of the sliding groove 305 away from the center of the positioning block 302 is provided with a clamping block 303. The interior of the sliding groove 305 is provided with a return spring 306. The end of the return spring 306 close to the center of the positioning block 302 is fixedly connected to the inner wall of the sliding groove 305. The end of the return spring 306 away from the center of the positioning block 302 is fixed to the end of the clamping block 303 close to the center of the positioning block 302. The outer walls of the clamping blocks 303 are all slidably connected to the inner walls of the slide grooves 305. The middle parts of the upper surfaces of the lower box body 2 are provided with grooves 203. The front and rear ends of the inner walls of the grooves 203 are provided with clamping grooves 204. The outer walls of the positioning blocks 302 are tightly fitted with the inner walls of the grooves 203. The outer walls of the clamping blocks 303 are clamped with the inner walls of the clamping grooves 204. The middle parts of the outer walls of the front and rear ends of the upper and lower box bodies 3 and 2 are fixedly connected with fixing parts 304 and fixed by fixing bolts. The staff will position the positioning block at the lower end of the upper box body 3. When the clamping block 303 contacts the inner wall of the groove 203, it is subjected to force and compresses the return spring 306 and then enters the slide groove 305. When the clamping block 303 moves to the end of the inner wall of the clamping groove 204 away from the center of the mounting block 4, the clamping block 303 is no longer subjected to force, and the return spring 306 returns to the clamping block 303 and engages the inner wall of the clamping groove 204, thereby making the upper box body 3 firmly fixed on the lower box body 2. The use of the return spring 306 provides The additional stability ensures that the device will not loosen during movement or use. It can also absorb and cushion the vibration caused by movement or external impact, protect internal sensitive components, and extend the service life of the device. The fixing member 304 is fixedly connected in the middle of the front and rear end outer walls of the upper box body 3 and the lower box body 2 and fixed by fixing bolts, which can further enhance the structural stability of the entire device. This design further ensures a firm connection between the upper box body 3 and the lower box body 2, and reduces loosening or displacement caused by vibration or impact during operation.

[0040] Reference Figure 1 and Figure 2The lower end of the water tank 101 is fixedly connected to the upper end of the fixed base plate 1, and the lower end of the water pump 102 is fixedly connected to the upper end of the fixed base plate 1. The water tank 101 and the water pump 102 are fixedly connected to the fixed base plate 1, thereby enhancing the structural stability of the entire device. A processor device 205, a speaker 206 and an alarm device 208 are provided inside the lower box body 2. The processor device 205 is responsible for processing the data input and output of the alarm, including analyzing network traffic, detecting abnormal behavior, etc., to ensure that the alarm can respond to potential security threats in a timely manner. The speaker 206 is used to issue an audible alarm. When a security threat is detected or an emergency response is required, the speaker 206 will issue an alarm sound to alert the operator. The alarm device 208 is used to display alarm information or status, such as alarm level, threat type, etc., so that the operator can quickly understand the alarm information. A temperature sensor 207 is provided inside the lower box body 2. The monitoring data of the temperature sensor 207 can be used to control the temperature of the equipment, such as starting or adjusting the cooling system. , to prevent the equipment from overheating. In addition, the temperature sensor 207 can be used as part of the early warning mechanism. When an abnormal temperature is detected, an alarm can be issued in time to remind the operator to take measures to avoid potential equipment failure or damage. The interior of the lower box body 2 is provided with a power supply device 209 and a backup power supply 210. The setting of the power supply device 209 and the backup power supply 210 provides a redundant power supply. Even if the main power supply fails, the backup power supply 210 can continue to power the equipment to ensure that the equipment continues to operate and reduce downtime caused by power problems. A power socket 201 is provided in the middle of the outer wall of one side of the lower box body 2. The design of the power socket 201 allows the equipment to be easily connected to the power supply without opening the equipment casing or removing any components. A plurality of air vents 202 are provided at the front and rear ends of the outer wall of the lower box body 2. The air vents 202 allow air to circulate, which helps to dissipate heat. When the cooling system is working, the air flow generated by the heat dissipation fan blades 405 can be discharged through the air vents 202, further accelerating heat dissipation and improving the heat dissipation effect.

[0041] Working principle: First, accurately align the positioning block 302 at the lower end of the upper box body 3 with the groove 203 of the lower box body 2 and move it downward. When the clamping block 303 contacts the inner wall of the groove 203, it will be subjected to force and compress the return spring 306 and then enter the slide groove 305. When the clamping block 303 moves to the end of the inner wall of the clamping groove 204 away from the center of the mounting block 4, the clamping block 303 is no longer subjected to force, and the return spring 306 returns to the clamping block 303 and engages the inner wall of the clamping groove 204, so that the upper box body 3 can be firmly fixed on the lower box body 2. The return spring 3 The use of 06 provides additional stability, ensuring that the device will not loosen during movement or use. At the same time, it can also absorb and buffer the vibration caused by movement or external impact, protect internal sensitive components, and extend the service life of the device. The fixing member 304 is fixed to the middle of the front and rear end outer walls of the upper box body 3 and the lower box body 2, and fixed by fixing bolts, which can further enhance the structural stability of the entire device. This design further ensures a firm connection between the upper box body 3 and the lower box body 2, reduces loosening or displacement caused by vibration or impact during operation, and When the temperature sensor 207 inside the body 2 detects that the temperature inside the alarm is too high, the water outlet of the water pump 102 is connected to the inside of the cooling pipe 103 through a pipe, and the cooling water is pumped into the cooling pipe 103. The cooling pipe 103 is located inside the lower box body 2 and is used to absorb the heat generated by the electronic components. The rear end of the cooling pipe 103 is connected to the inside of the water tank 101 to form a circulation loop, so that the cooling water can be recycled and continuously absorb heat. The water tank 101 stores cooling water, and the water pump 102 is responsible for extracting water from the water tank 101. In addition, the fan blades 405 are controlled by the servo. The motor drive provides additional heat dissipation function, further ensuring the stability of the device in high temperature environments. The design of the transmission gear 403 and the toothed belt 404 enables the servo motor 4 to simultaneously control the rotation of the first connecting rod 401 and the second connecting rod 402 and then control the rotation of the fan blade 405, thereby improving the efficiency and accuracy of the entire system. Through these designs, the network security alarm can maintain stable operation in high temperature environments, effectively preventing the equipment from being damaged due to overheating, while improving the efficiency and accuracy of the system, ensuring the stability and reliability of the equipment under various working conditions.

[0042] Finally, it should be noted that the above is only a preferred specific implementation method of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned specific implementation methods, those skilled in the art can still modify the technical solutions described in the aforementioned specific implementation methods or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A network security alarm, comprising a fixed base plate (1), an upper box body (3) and a servo motor (4), characterized in that: The middle of the upper end of the fixed bottom plate (1) is fixedly connected to the lower box body (2), a water tank (101) is provided on one side of the front end outer wall of the lower box body (2), a water pump (102) is provided on one side of the water tank (101), a cooling pipe (103) is provided inside the lower box body (2), the water outlet of the water pump (102) is connected to the inside of the cooling pipe (103) through a pipe, the water inlet of the water pump (102) is connected to the inside of the water tank (101) through a pipe, the rear end of the cooling pipe (103) is connected to the inside of the water tank (101), a protective shell (301) is fixedly connected to one side of the upper end outer wall of the upper box body (3), the servo motor (4) is located inside the protective shell (301), and the output end of the servo motor (4) is connected through the protective shell (301). The box body (3) is put on to the interior of the upper box body (3) and is fixedly connected to a first connecting rod (401); the middle part of the other side of the inner top surface of the upper box body (3) is rotatably connected to a second connecting rod (402); the outer walls of the first connecting rod (401) and the second connecting rod (402) are both sleeved with a transmission gear (403); the outer wall gear of the transmission gear (403) is meshed with a toothed belt (404); the transmission gear (403) and the toothed belt (404) are both located inside the upper box body (3); the first connecting rod (401) and the second connecting rod (402) are located inside the upper box body (3); the lower ends of the first connecting rod (401) and the second connecting rod (402) pass through the upper box body (3) to the outside of the lower end of the upper box body (3) and are fixedly connected to a fan blade (405).

2. A network security alarm according to claim 1, characterized in that: The middle parts of both sides of the lower surface of the upper box body (3) are fixedly connected with positioning blocks (302), the front end and the rear end of the outer wall of the positioning block (302) are provided with a sliding groove (305), the end of the sliding groove (305) away from the center of the positioning block (302) is provided with a clamping block (303), the interior of the sliding groove (305) is provided with a return spring (306), the end of the return spring (306) close to the center of the positioning block (302) is fixedly connected to the inner wall of the sliding groove (305), the end of the return spring (306) away from the center of the positioning block (302) is fixedly connected to the inner wall of the sliding groove (305), and the end of the return spring (306) away from the center of the positioning block (302) is fixedly connected to the clamping block (303) close to the positioning block ( The outer walls of the clamping blocks (303) are slidably connected to the inner walls of the slide grooves (305). Grooves (203) are provided in the middle of both sides of the upper surface of the lower box body (2). The front and rear ends of the inner walls of the grooves (203) are provided with clamping grooves (204). The outer walls of the positioning blocks (302) are tightly fitted with the inner walls of the grooves (203). The outer walls of the clamping blocks (303) are clamped and matched with the inner walls of the clamping grooves (204). The middle parts of the outer walls of the front and rear ends of the upper box body (3) and the lower box body (2) are fixedly connected with fixing members (304) and fixed by fixing bolts.

3. The network security alarm according to claim 1, characterized in that: The lower end of the water tank (101) is fixedly connected to the upper end of the fixed base plate (1), and the lower end of the water pump (102) is fixedly connected to the upper end of the fixed base plate (1).

4. The network security alarm according to claim 1, characterized in that: A processor device (205), a speaker (206) and an alarm device (208) are provided inside the lower box body (2).

5. The network security alarm according to claim 1, characterized in that: A temperature sensor (207) is provided inside the lower box body (2).

6. The network security alarm according to claim 1, characterized in that: A power supply device (209) and a backup power supply (210) are provided inside the lower box body (2).

7. The network security alarm according to claim 1, characterized in that: A power socket (201) is provided in the middle of an outer wall on one side of the lower box body (2).

8. The network security alarm according to claim 1, characterized in that: A plurality of air holes (202) are provided at the front and rear ends of the outer wall of the lower box body (2).

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