Flame-retardant galvanized cable bridge

Abstract

The invention relates to the technical field of cable bridges, in particular to a flame-retardant galvanized cable bridge which comprises a bridge body, a placement cavity is formed in the top of the bridge body, a bridge cover plate is detachably mounted at the top of the bridge body, and two sealing plates are vertically and fixedly mounted at the bottom of the bridge cover plate. The air inlet cleaning assembly comprises a cleaning base fixedly installed at the bottom of the bridge body, a cleaning cavity communicating with the containing cavity is formed in the cleaning base, a first electromagnetic valve is installed at the communicating position of the cleaning cavity and the containing cavity, and a second electromagnetic valve is installed at the communicating position of the cleaning cavity and the containing cavity. The filter screen cylinder dynamically intercepts dust, rotary scraping and reverse airflow cleaning are combined, the filtering efficiency is remarkably improved, manual intervention is not needed, automatic cleaning is achieved through linkage of the draught fan and the electromagnetic valve, the maintenance cost is reduced, it is ensured that scraped dust is directly discharged through the reverse airflow design, and particulate matter is prevented from entering the bridge again.

Description

Technical Field

[0001] This invention relates to the field of cable tray technology, and specifically to a flame-retardant galvanized cable tray. Background Technology

[0002] Galvanized cable trays are widely used in cable laying in power, communications and other fields. They have advantages such as corrosion resistance, high strength and flame retardancy. However, traditional galvanized cable trays have the following problems in actual use: Poor dust protection: Cable trays are exposed to the environment for a long time, and dust and impurities can easily enter the inside of the tray through gaps, adhere to the surface of the cables, affect heat dissipation, and may cause safety hazards such as short circuits.

[0003] Difficult to clean and maintain: Traditional cable trays mostly use fixed filters, which require manual cleaning after dust accumulation, making the operation cumbersome and inefficient.

[0004] Incomplete cleaning: In existing technologies, cleaning the filter screen can easily re-bring the scraped dust back into the cable tray, causing secondary pollution.

[0005] To address the aforementioned issues, this invention proposes a flame-retardant galvanized cable tray that achieves efficient dust prevention and self-cleaning functions through innovatively designed air intake cleaning components and auxiliary exhaust components. Summary of the Invention

[0006] This invention provides a flame-retardant galvanized cable tray, the core of which is to achieve dynamic filtration and self-cleaning through the linkage of a rotating filter cylinder and a fan, which significantly improves the dust prevention effect and cleaning efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a flame-retardant galvanized cable tray, comprising a tray body, a placement cavity at the top of the tray body, a tray cover plate detachably mounted on the top of the tray body, two sealing plates vertically fixedly mounted on the bottom of the tray cover plate, semi-circular holes at the bottom of the two sealing plates and at the top of both ends of the tray body, and a plurality of semi-circular holes combined vertically to form a complete circular hole, further comprising: An air intake cleaning assembly includes a cleaning seat fixedly installed at the bottom of the cable tray body. The cleaning seat has a cleaning cavity communicating with a placement cavity. A first solenoid valve is installed at the connection between the cleaning cavity and the placement cavity. A groove is formed through the outer wall of the cleaning seat through the cleaning cavity. A filter screen is rotatably installed in the cleaning cavity. A portion of the outer wall of the filter screen extends from the groove to the outside of the cleaning seat. The filter screen is designed to fit snugly against the inner wall of the groove. An auxiliary exhaust assembly includes a fan installed at the bottom of the cable tray body. One input end of the fan is connected to the inner cavity of the placement chamber, and a second solenoid valve is installed at the connection point. A third solenoid valve is installed at the other input port of the fan, and the output end of the fan is connected to the cleaning chamber.

[0008] Furthermore, threaded holes are provided at the four corners of the top of the cable tray body, and sealing semicircular rings are fixedly bonded to the inner walls of the semicircular holes. The upper and lower corresponding sealing semicircular rings form a complete ring, and the positions of the several complete rings on both sides are opposite to each other. Two air vents are provided at the bottom of the cable tray body through the placement cavity. The two air vents are respectively connected to the first solenoid valve and the second solenoid valve. Filter screens are embedded and fixedly installed at the two air vents.

[0009] Furthermore, a number of parallel and equally spaced rotating rods are rotatably installed between the two opposing inner walls of the placement cavity. The height of the top of the rotating rods is consistent with the height of the lowest point of the inner wall of the sealing semicircular rings. Fixed screws are threaded through and installed at the four corners of the bridge frame body.

[0010] Furthermore, small screws are threaded through each of the four corners of the cable tray cover. When the cable tray cover is fastened to the top of the cable tray body to form several complete circular rings, several of the small screws are threaded into the corresponding threaded holes, and the top of the cable tray cover is flush with the top of the cable tray body.

[0011] Furthermore, a motor is fixedly installed at one end of the cleaning seat, and a rotating shaft is fixedly connected between the motor and the end of the filter cylinder through a reducer. The rotating shaft extends through into the cleaning chamber.

[0012] Furthermore, an exhaust pipe is connected between the output end of the fan and the cleaning chamber, an air inlet filter is embedded in another input port of the fan, and the third solenoid valve is located between the fan input port and the air inlet filter.

[0013] The technical solution provided by this invention has the following advantages compared with the known prior art: High-efficiency dust prevention: The filter cylinder dynamically intercepts dust, and the combination of rotating scraping and reverse airflow cleaning significantly improves filtration efficiency.

[0014] Self-cleaning capability: No manual intervention is required; automatic cleaning is achieved through the linkage of a fan and a solenoid valve, reducing maintenance costs.

[0015] Preventing secondary pollution: The reverse airflow design ensures that the scraped dust is directly discharged, preventing particles from re-entering the cable tray. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the overall first-view structure of the present invention; Figure 2 This is a schematic diagram of the overall second-view structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of the present invention after the cable tray cover plate has been removed; Figure 4 This is a schematic diagram of the cable tray cover plate structure of the present invention; Figure 5 This is a schematic diagram of the air intake cleaning component and auxiliary exhaust component of the present invention; Figure 6 This is a schematic diagram of the filter cylinder installation structure of the present invention; Figure 7 This is a schematic diagram showing the specific location of the groove in the cleaning seat according to the present invention.

[0018] The labels in the diagram represent: 1. Cable tray body; 11. Rotating rod; 12. Fixing screw; 2. Cable tray cover plate; 21. Small screws; 22. Sealing plate; 3. Cleaning seat; 31. First solenoid valve; 32. Groove; 33. Motor; 34. Filter screen cylinder; 35. Rotating shaft; 4. Fan; 41. Exhaust duct; 42. Inlet filter. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] The present invention will be further described below with reference to embodiments.

[0021] Example 1: Basic operating mode (normal ventilation and heat dissipation)

[0022] Structural Correspondence Description: Cable tray body 1: Installed on the bracket, with an internal cavity for accommodating cables.

[0023] Cable tray cover plate 2: fixed to the top of the cable tray body 1 by small screws 21.

[0024] Sealing plate 22: It is vertically fixed to the bottom of the cable tray cover plate 2 and cooperates with the cable tray body 1 to form a sealing structure.

[0025] Cleaning seat 3: It is fixedly installed at the bottom of the cable tray body 1 and has a cleaning chamber inside.

[0026] First solenoid valve 31: installed at the connection between the cleaning chamber and the placement chamber.

[0027] Groove 32: It is formed on the outer wall of the cleaning seat 3 and is used in conjunction with the filter screen 34.

[0028] Motor 33: Fixedly installed at one end of cleaning seat 3.

[0029] Filter cylinder 34: Rotatably installed inside the cleaning chamber, partially exposed in the groove 32.

[0030] Rotating shaft 35: connects motor 33 and filter cylinder 34.

[0031] Fan 4: Installed at the bottom of the cable tray body 1.

[0032] Second solenoid valve: installed at the connection between fan 4 and placement chamber.

[0033] The third solenoid valve is installed at another input port of the fan 4.

[0034] Exhaust duct 41: Connects the output end of fan 4 to the cleaning chamber.

[0035] Air inlet filter 42: Embedded and installed at another input port of fan 4.

[0036] Threaded holes: are made at the four corners of the top of the cable tray body 1.

[0037] Sealing semi-circular ring: fixedly bonded to the inner wall of the semi-circular hole.

[0038] Rotating rod 11: Rotatably installed between the inner walls of the placement cavity.

[0039] Fixing screw 12: The threaded screw is installed at the four corners of the cable tray body 1.

[0040] Work process: The first solenoid valve 31 is open, the second solenoid valve is open, and the third solenoid valve is closed.

[0041] External air enters the cleaning chamber through groove 32 and is filtered by rotating filter cylinder 34.

[0042] The filtered air enters the placement chamber through the first solenoid valve 31.

[0043] The fan 4 draws air from the placement chamber through the second solenoid valve and discharges it back to the cleaning chamber through the exhaust pipe 41, forming a circulating airflow.

[0044] The motor 33 drives the filter cylinder 34 to rotate slowly through the rotating shaft 35 to achieve continuous filtration.

[0045] Reference Figure 1-7 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the basic working mode (normal ventilation and heat dissipation) is different. Structural Correspondence Description: Cable tray body 1: Installed on the bracket, with an internal cavity for accommodating cables.

[0046] Cable tray cover plate 2: fixed to the top of the cable tray body 1 by small screws 21.

[0047] Sealing plate 22: It is vertically fixed to the bottom of the cable tray cover plate 2 and cooperates with the cable tray body 1 to form a sealing structure.

[0048] Cleaning seat 3: It is fixedly installed at the bottom of the cable tray body 1 and has a cleaning chamber inside.

[0049] First solenoid valve 31: installed at the connection between the cleaning chamber and the placement chamber.

[0050] Groove 32: It is formed on the outer wall of the cleaning seat 3 and is used in conjunction with the filter screen 34.

[0051] Motor 33: Fixedly installed at one end of cleaning seat 3.

[0052] Filter cylinder 34: Rotatably installed inside the cleaning chamber, partially exposed in the groove 32.

[0053] Rotating shaft 35: connects motor 33 and filter cylinder 34.

[0054] Fan 4: Installed at the bottom of the cable tray body 1.

[0055] Second solenoid valve: installed at the connection between fan 4 and placement chamber.

[0056] The third solenoid valve is installed at another input port of the fan 4.

[0057] Exhaust duct 41: Connects the output end of fan 4 to the cleaning chamber.

[0058] Air inlet filter 42: Embedded and installed at another input port of fan 4.

[0059] Threaded holes: are made at the four corners of the top of the cable tray body 1.

[0060] Sealing semi-circular ring: fixedly bonded to the inner wall of the semi-circular hole.

[0061] Rotating rod 11: Rotatably installed between the inner walls of the placement cavity.

[0062] Fixing screw 12: The threaded screw is installed at the four corners of the cable tray body 1.

[0063] Work process: The first solenoid valve 31 is closed, the second solenoid valve is closed, and the third solenoid valve is open.

[0064] The motor 33 accelerates its operation, driving the filter cylinder 34 to rotate rapidly.

[0065] Fan 4 draws in outside air through air inlet filter 42 and third solenoid valve.

[0066] High-pressure airflow enters the cleaning chamber through the exhaust pipe 41 and is sprayed outward from inside the filter cylinder 34.

[0067] The high-speed rotating filter cylinder 34 completes self-cleaning under the scraping action of the edge of the groove 32 and the flushing of the reverse airflow.

[0068] Dust that falls off during the cleaning process is discharged from the system through groove 32 with the airflow.

[0069] The remaining structure is the same as that in Example 1.

[0070] Reference Figure 1-7 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the basic working mode (normal ventilation and heat dissipation) is different. Structural Correspondence Description: Cable tray body 1: Installed on the bracket, with an internal cavity for accommodating cables.

[0071] Cable tray cover plate 2: fixed to the top of the cable tray body 1 by small screws 21.

[0072] Sealing plate 22: It is vertically fixed to the bottom of the cable tray cover plate 2 and cooperates with the cable tray body 1 to form a sealing structure.

[0073] Cleaning seat 3: It is fixedly installed at the bottom of the cable tray body 1 and has a cleaning chamber inside.

[0074] First solenoid valve 31: installed at the connection between the cleaning chamber and the placement chamber.

[0075] Groove 32: It is formed on the outer wall of the cleaning seat 3 and is used in conjunction with the filter screen 34.

[0076] Motor 33: Fixedly installed at one end of cleaning seat 3.

[0077] Filter cylinder 34: Rotatably installed inside the cleaning chamber, partially exposed in the groove 32.

[0078] Rotating shaft 35: connects motor 33 and filter cylinder 34.

[0079] Fan 4: Installed at the bottom of the cable tray body 1.

[0080] Second solenoid valve: installed at the connection between fan 4 and placement chamber.

[0081] The third solenoid valve is installed at another input port of the fan 4.

[0082] Exhaust duct 41: Connects the output end of fan 4 to the cleaning chamber.

[0083] Air inlet filter 42: Embedded and installed at another input port of fan 4.

[0084] Threaded holes: are made at the four corners of the top of the cable tray body 1.

[0085] Sealing semi-circular ring: fixedly bonded to the inner wall of the semi-circular hole.

[0086] Rotating rod 11: Rotatably installed between the inner walls of the placement cavity.

[0087] Fixing screw 12: The threaded screw is installed at the four corners of the cable tray body 1.

[0088] Air vent filter: performs primary filtration of incoming air.

[0089] Sealing semi-circular ring: Ensures the cable thread hole is sealed.

[0090] Rotating rod 11: Reduces friction when the cable moves.

[0091] The first solenoid valve 31 opens and closes intermittently (opening for 10 seconds and closing for 5 seconds).

[0092] The second solenoid valve remains open, while the third solenoid valve remains closed.

[0093] Fan 4 runs continuously at medium speed to maintain a slightly negative pressure in the placement chamber.

[0094] When an increase in resistance is detected in filter cylinder 34: a. First solenoid valve 31 is closed. b. The second solenoid valve is closed. c. The third solenoid valve opens. d. Perform the self-cleaning procedure of Example 2. After cleaning, the system will return to normal operation.

[0095] The remaining structure is the same as that in Example 2.

[0096] 1. Hardware components of the control system Main controller: It adopts a PLC (Programmable Logic Controller) or microcontroller (such as STM32 series) and is responsible for receiving sensor signals and controlling the operation of solenoid valves, fans and motors.

[0097] Sensor configuration: Differential pressure sensor: Installed on both sides of filter cylinder 34, it monitors the pressure difference between the inlet and outlet air and determines the degree of blockage (e.g., when the pressure difference is ≥200Pa, the cleaning mode is triggered).

[0098] Dust concentration sensor: Located inside the placement chamber, it monitors the dust content in real time (e.g., when PM2.5 ≥ 100 μg / m³, it switches to high dust mode).

[0099] Temperature sensor: monitors cable temperature and adjusts fan speed accordingly (e.g., increase fan speed by 20% when temperature ≥ 60℃).

[0100] Execution unit: Solenoid valve: 24V DC normally closed type, response time ≤0.1 seconds.

[0101] Fan 4: Variable frequency speed control fan, air volume range 20-100m³ / h, supports PWM control.

[0102] Motor 33: Stepper motor or servo motor, speed adjustable from 50 to 500 rpm.

[0103] 2. Control Logic and Triggering Conditions (1) Normal ventilation mode Triggering conditions: The system starts in the default state, or automatically recovers after the cleaning mode is completed.

[0104] Controlling actions: PLC output signals: First solenoid valve 31 (open), second solenoid valve (open), third solenoid valve (closed).

[0105] Fan 4 operates at a reference speed (e.g., 50 m³ / h).

[0106] The motor 33 rotates at a low speed (50 rpm) to maintain continuous filtration by the filter cylinder 34.

[0107] (2) Filter cylinder self-cleaning mode Triggering condition (any one of the following must be met): The differential pressure sensor detected a pressure difference of ≥200Pa across the filter cylinder 34.

[0108] Scheduled cleaning (automatically starts once every 24 hours).

[0109] Manual forced cleaning command.

[0110] Controlling actions: The PLC closes the first solenoid valve 31 and the second solenoid valve, and opens the third solenoid valve.

[0111] Fan 4 switches to high-speed mode (80m³ / h), and the airflow is injected in reverse.

[0112] Motor 33 accelerates to 300 rpm and rotates continuously for 2 minutes.

[0113] After cleaning is completed, the system automatically detects the differential pressure. If it is ≤50Pa, it returns to normal mode.

[0114] (3) High dust environment mode Triggering condition: The dust concentration sensor detects PM2.5 ≥ 100 μg / m³ for 5 consecutive minutes.

[0115] Controlling actions: The first solenoid valve 31 opens and closes intermittently (opening for 10 seconds and closing for 5 seconds) to reduce the amount of dust entering the system.

[0116] The second solenoid valve is normally open, and the fan 4 maintains a medium speed (60m³ / h) to keep the negative pressure.

[0117] If the pressure difference is ≥150Pa, the self-cleaning mode will be executed first.

[0118] 3. Control Process ├─ Detect pressure difference / dust / temperature │ ├─ Normal Mode: │ ├─ First and second solenoid valves open, third solenoid valve closes │ ├─ Fan capacity: 50 m³ / h, Motor speed: 50 rpm │ ├─ Self-cleaning mode (pressure difference ≥ 200Pa or timed trigger): │ ├─ First and second solenoid valves are closed, third solenoid valve is open │ ├─ Fan capacity: 80 m³ / h, Motor speed: 300 rpm │ ├─ Continue for 2 minutes → Detect differential pressure → Restore │ └─ High Dust Mode (PM2.5 ≥ 100 μg / m³): ├─ First solenoid valve intermittent switching ├─ The second solenoid valve is normally open, and the fan operates at 60 m³ / h. └─ Pressure difference ≥ 150Pa → Switch to self-cleaning mode 4. Publicly available supplementary parameters Solenoid valve specifications: Operating voltage: 24V DC Nominal diameter: DN15 Pressure resistance: ≥0.8MPa Fan performance: Rated wind pressure: 800Pa Frequency conversion range: 20-100Hz Sensor accuracy: Differential pressure sensor: ±5Pa Dust sensor: ±10μg / m³

[0119] 1. Cable installation and sealing First, fix the cable tray body 1 to the mounting bracket using fixing screws 12.

[0120] The cable passes through the semi-circular holes at both ends of the cable tray body 1 into the placement cavity. The cable tray cover plate 2 is fixed to the top of the cable tray body 1 by small screws 21, so that the sealing plate 22 presses the cable tightly.

[0121] The upper and lower corresponding semicircular holes are combined to form a complete circular hole, and the cable is sealed and fixed by a sealing semicircular ring to prevent dust from entering.

[0122] The cable is placed on the rotating rod 11 to reduce friction and facilitate later maintenance or adjustment.

[0123] 2. Normal ventilation and filtration External air enters the cleaning chamber through the groove 32 of the cleaning seat 3 and is filtered by the filter screen 34 to remove dust and impurities.

[0124] The first solenoid valve 31 opens, and the filtered air enters the placement chamber through the air vent, providing heat dissipation airflow for the cable.

[0125] When fan 4 starts, the second solenoid valve opens, drawing air from the placement chamber to enhance airflow and improve heat dissipation efficiency.

[0126] The third solenoid valve is closed to ensure that the fan 4 draws air only from the placement chamber, preventing unfiltered external air from entering.

[0127] 3. Self-cleaning process of filter cylinder 34 When a certain amount of dust accumulates on the surface of the filter cylinder 34, the system enters cleaning mode.

[0128] The first solenoid valve 31 is closed, preventing outside air from entering the placement chamber.

[0129] The motor 33 starts and drives the filter cylinder 34 to rotate slowly through the rotating shaft 35.

[0130] Fan 4 switches operating modes: The second solenoid valve closes, stopping the extraction of air from the placement chamber.

[0131] The third solenoid valve opens, and the fan 4 draws in air from the outside through the air inlet filter 42.

[0132] High-pressure airflow enters the cleaning chamber through the exhaust pipe 41 and is sprayed outward from inside the filter cylinder 34 to blow away the dust attached to the filter holes.

[0133] The rotation of the filter cylinder 34 causes the scraped dust to be carried away by the airflow and discharged through the groove 32, preventing the dust from re-entering the cable tray.

[0134] 4. Cleaning completed and ventilation restored After cleaning is completed, motor 33 stops and filter cylinder 34 resets.

[0135] The first solenoid valve 31 reopens, restoring the filtration of external air.

[0136] Fan 4 switches back to normal mode: The third solenoid valve is closed, and the second solenoid valve is opened, continuing to draw air from the placement chamber to maintain the circulation of heat dissipation airflow.

[0137] The system has been restored to normal operation, ensuring that the cable is kept in a low-dust, high-efficiency heat dissipation environment for a long time.

[0138] Key structural synergy Filter cylinder 34: Dynamically filters air, and its rotation, combined with reverse airflow, achieves self-cleaning.

[0139] Fan 4 combined with solenoid valve: By switching the airflow direction, the heat dissipation and cleaning modes can be flexibly switched.

[0140] Sealing plate 22 and sealing semi-circular ring: Ensure the sealing of the cable threading point and reduce dust intrusion.

[0141] Rotating rod 11: Reduces cable friction and facilitates maintenance.

[0142] This process enables automatic dust prevention, efficient heat dissipation, and maintenance-free cleaning of cable trays, making them suitable for long-term stable operation in high-dust environments.

[0143] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame-retardant galvanized cable tray, comprising a tray body (1), wherein a placement cavity is provided at the top of the tray body (1), a tray cover plate (2) is detachably installed at the top of the tray body (1), and two sealing plates (22) are vertically fixedly installed at the bottom of the tray cover plate (2). Semi-circular holes are provided at the bottom of the two sealing plates (22) and at the top of both ends of the tray body (1), and a plurality of semi-circular holes are combined vertically to form a complete circular hole. The feature is that... Also includes: An air intake cleaning assembly includes a cleaning seat (3) fixedly installed at the bottom of the cable tray body (1). The cleaning seat (3) has a cleaning chamber that communicates with the placement chamber. A first solenoid valve (31) is installed at the connection between the cleaning chamber and the placement chamber. The outer wall of the cleaning seat (3) has a groove (32) that runs through the cleaning chamber. A filter screen cylinder (34) is rotatably installed in the cleaning chamber. A portion of the outer wall of the filter screen cylinder (34) extends from the groove (32) to the outside of the cleaning seat (3). The filter screen cylinder (34) is designed to fit snugly against the inner wall of the groove (32). The auxiliary exhaust assembly includes a fan (4) installed at the bottom of the cable tray body (1). One of the input ends of the fan (4) is connected to the inner cavity of the placement chamber, and a second solenoid valve is installed at the connection point. A third solenoid valve is installed at the other input port of the fan (4), and the output end of the fan (4) is connected to the cleaning chamber.

2. The flame-retardant galvanized cable tray according to claim 1, characterized in that, The cable tray body (1) has threaded holes at the four corners of the top. The inner walls of the semicircular holes are fixedly bonded with sealing semicircular rings. The two sealing semicircular rings that are corresponding to each other form a complete ring. The positions of the several complete rings on both sides are opposite to each other. The bottom of the cable tray body (1) has two air vents through the placement cavity. The two air vents are respectively connected to the first solenoid valve (31) and the second solenoid valve. Filter screens are fixedly installed in the two air vents.

3. The flame-retardant galvanized cable tray according to claim 1, characterized in that, A number of parallel and equally spaced rotating rods (11) are rotatably installed between the two opposing inner walls of the placement cavity. The height of the top of the rotating rods (11) is consistent with the height of the lowest point of the inner wall of the sealing semicircular ring. Fixing screws (12) are threaded through the four corners of the bridge frame body (1).

4. A flame-retardant galvanized cable tray according to claim 2, characterized in that, Small screws (21) are threaded through at the four corners of the cable tray cover plate (2). When the cable tray cover plate (2) is fastened to the top of the cable tray body (1) to form several complete circular rings, several small screws (21) are threaded into the corresponding threaded holes respectively. The top of the cable tray cover plate (2) is flush with the top of the cable tray body (1).

5. A flame-retardant galvanized cable tray according to claim 1, characterized in that, A motor (33) is fixedly installed at one end of the cleaning seat (3). The motor (33) is connected to the end of the filter cylinder (34) by a reducer and a rotating shaft (35). The rotating shaft (35) extends through into the cleaning chamber.

6. A flame-retardant galvanized cable tray according to claim 1, characterized in that, An exhaust pipe (41) is connected between the output end of the fan (4) and the cleaning chamber. An air inlet filter (42) is embedded in another input port of the fan (4). The third solenoid valve is located between the input port of the fan (4) and the air inlet filter (42).

Images