CN214124367U - Dustproof power distribution cabinet - Google Patents
Dustproof power distribution cabinet Download PDFInfo
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- CN214124367U CN214124367U CN202120082300.4U CN202120082300U CN214124367U CN 214124367 U CN214124367 U CN 214124367U CN 202120082300 U CN202120082300 U CN 202120082300U CN 214124367 U CN214124367 U CN 214124367U
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Abstract
The application relates to a dustproof power distribution cabinet, which belongs to the field of power distribution cabinets and comprises a cabinet body, wherein a cabinet door is rotatably arranged on the cabinet body; a heat dissipation fan is fixedly arranged at the lower end of the cabinet body; the inner side wall of the cabinet body below the heat dissipation fan is connected with an air inlet pipe which is inclined upwards, and a plurality of air inlets are arranged on the inner side wall of the cabinet body in the air inlet pipe in a penetrating manner along the wall thickness direction of the cabinet body; the inner side wall of the cabinet body above the heat dissipation fan is provided with a plurality of exhaust holes in a penetrating manner along the wall thickness direction of the cabinet body; the inner bottom wall of the air inlet pipe is provided with a plurality of flow baffle plates extending upwards, and the flow baffle plates are sequentially arranged along the length direction of the air inlet pipe; and a gap is formed between the upper end wall of each flow baffle and the inner top wall of the air inlet pipe. After the outside air enters the air inlet pipe from the air inlet hole, the flow baffle plate has a blocking effect on the air, so that the air flow rate is reduced, dust and other impurities in the air are convenient to settle, and the dust and other impurities in the air entering the cabinet body from the air inlet pipe are reduced.
Description
Technical Field
The application relates to the field of power distribution cabinets, in particular to a dustproof power distribution cabinet.
Background
The switch board is a cabinet body that is used for installing electrical components such as control switch or relay, and operating personnel accessible is controlled the electrical component of installing in the switch board and is carried out control operation such as break, break to the circuit.
The traditional Chinese patent with publication number CN208690807U discloses a power distribution cabinet, which comprises a cabinet body, wherein a plurality of through holes are formed in the side wall of the lower end of the cabinet body in a penetrating manner along the wall thickness direction of the cabinet body; a fixed top plate is fixedly arranged at the upper end of the cabinet body, the fixed top plate is connected with a movable top plate in a sliding mode along the horizontal direction, and a plurality of strip-shaped holes are formed in the fixed top plate and the movable top plate in a penetrating mode along the vertical direction; the cabinet body is provided with the cylinder, and the cylinder body and the cabinet body fixed connection, cylinder piston rod and movable roof fixed connection. When raining, the cylinder can drive the movable top plate to move to the messenger is located the bar hole of movable top plate and is located the bar hole of fixed top plate crisscross, moves the bar hole that the top plate can seal to be located the fixed top plate, and it is internal to prevent that the rainwater from getting into the cabinet by the bar hole. When fine, the cylinder drive moves the roof and removes to the bar hole that makes to be located and moves the roof aligns with the bar hole that is located the roof, the internal thermal giveaway of cabinet of being convenient for.
In view of the above-mentioned related technologies, the inventor believes that foreign matters such as external dust easily enter the cabinet body through the strip-shaped hole or the through hole located at the lower part of the cabinet body, so as to cause the influences of damage of the circuit board, low heat dissipation efficiency of the electrical component, and the like, and thus needs to be improved.
SUMMERY OF THE UTILITY MODEL
In order to reduce debris such as dust and get into the cabinet internally, this application provides a dustproof switch board.
The application provides a dustproof switch board adopts following technical scheme:
a dustproof power distribution cabinet comprises a cabinet body, wherein a cabinet door is rotatably arranged on the cabinet body; a heat dissipation fan is fixedly arranged at the lower end of the cabinet body; the inner side wall of the cabinet body below the heat dissipation fan is connected with an air inlet pipe which is inclined upwards, and a plurality of air inlets are arranged on the inner side wall of the cabinet body in the air inlet pipe in a penetrating manner along the wall thickness direction of the cabinet body; the inner side wall of the cabinet body above the heat dissipation fan is provided with a plurality of exhaust holes in a penetrating manner along the wall thickness direction of the cabinet body; the inner bottom wall of the air inlet pipe is provided with a plurality of flow baffle plates extending upwards, and the flow baffle plates are sequentially arranged along the length direction of the air inlet pipe; and a gap is formed between the upper end wall of each flow baffle and the inner top wall of the air inlet pipe.
By adopting the technical scheme, the heat dissipation fan rotates to drive the air at the bottom of the cabinet body to move upwards; the high-temperature hot gas in the cabinet body can be discharged from the exhaust hole, and the external low-temperature cold gas can enter the cabinet body from the air inlet hole through the air inlet pipe. The gas entering the gas inlet pipe sequentially flows through the flow baffle plates along the length direction of the gas inlet pipe, the flow rate of the gas flowing between every two adjacent flow baffle plates is reduced, and impurities such as dust in the gas can be conveniently settled to the bottom wall of the gas inlet pipe; the gas that subsides flows to the cabinet internally by keeping off the clearance between the roof in class board and the intake pipe to reduce and get into debris such as dust in the internal gas of cabinet by the intake pipe, be convenient for guarantee the internal cleanness of cabinet, guarantee the normal operating of electric component. The intake pipe is located heat dissipation fan below, and the exhaust hole is located heat dissipation fan top, is favorable to guaranteeing that external gas only gets into the cabinet by the inlet port internal, and the internal gas of cabinet is only discharged by the exhaust hole, is favorable to reducing the internal gas of cabinet by the exhaust hole entering to guarantee the intake pipe to the gaseous settlement filtering action that gets into the cabinet.
Optionally, the inner bottom wall of the air inlet pipe, which is located on one side of each flow baffle plate away from the air inlet hole, is provided with a dust falling hole in a downward penetrating manner; the outer side wall of the air inlet pipe is provided with a dust collecting box which can cover all dust falling holes.
Through adopting above-mentioned technical scheme, deposit debris such as dust to the interior diapire of intake pipe can follow the interior diapire landing of intake pipe to falling the dirt hole and falling into the dust collecting box, reduce the gathering of debris such as dust at the interior diapire of intake pipe to prevent that debris such as dust that have subsided from raising along with gaseous flow, guarantee the efficiency of subsiding of intake pipe to debris such as dust in the gas.
Optionally, a dust collecting box with an opening at the upper end is arranged in the dust collecting box, and a mounting hole for inserting the dust collecting box into the dust collecting box is arranged on the side wall of the dust collecting box facing the direction of the cabinet door in a penetrating manner.
Through adopting above-mentioned technical scheme, when debris such as dust in the dust box need be cleared up, operating personnel directly with the dust collection box by the mounting hole take out can, easy operation, convenience.
Optionally, the side wall of the dust collection box provided with the mounting hole is rotatably provided with a rotating rod which can be abutted against the outer side wall of the dust collection box.
Through adopting above-mentioned technical scheme, rotate the dwang, can make dwang and dust collection box butt in order to fix the dust collection box, it is more convenient to operate. The rotating rod is connected with the dust collecting box in a butting mode, so that the dust collecting box can be prevented from moving, the dust collecting box is convenient to be in sealing fit with the mounting hole, and therefore sundries such as dust in the dust collecting box are prevented from leaking.
Optionally, a clamping block is fixedly arranged on the upper surface of the air inlet pipe; the inner side wall of the cabinet body is fixedly provided with a connecting block, and the connecting block is fixedly provided with an abutting block which can be abutted against the side wall of the clamping block, which is far away from one side of the air inlet hole; the cabinet body inside wall is fixedly provided with can with the board of accepting of intake pipe lower surface butt.
Through adopting above-mentioned technical scheme, accept board and butt piece cooperation so that intake pipe and the laminating of cabinet internal side wall, simple structure, convenient operation. When the intake pipe was dismantled to needs, operating personnel only needed to the cabinet door direction pulling intake pipe, broke away from until joint piece and butt piece, can easily take off the intake pipe to carry out the degree of depth cleanness to the intake pipe, prevent debris such as dust from being stained with and attaching fender stream board or intake pipe inside wall and influence the unobstructed nature of gas flow.
Optionally, the cabinet body inside wall slides along upper and lower direction and is connected with the dead lever, the intake pipe is provided with the fixed slot that can supply dead lever one end male.
Through adopting above-mentioned technical scheme, dead lever and fixed slot cooperation are with fixed intake pipe, simple structure, convenient operation. The air inlet pipe is fixed, so that the air inlet hole can be prevented from being exposed due to movement of the air inlet pipe, and external air can directly enter the cabinet body.
Optionally, an elastic element capable of driving the fixing rod to move towards the fixing groove is arranged between the fixing rod and the cabinet body.
Through adopting above-mentioned technical scheme, after the dead lever inserted the fixed slot, the elastic component had the effort that the drive dead lever removed to the fixed slot direction to the dead lever, and the dead lever inserts the end wall and the fixed slot diapire of fixed slot one end and supports tightly, prevents that dead lever and fixed slot from breaking away from. When the fixed rod is aligned to the fixed groove, the elastic piece can drive the fixed rod to be automatically inserted into the fixed groove, and the operation is convenient.
Optionally, the cabinet body inside wall is fixedly provided with a positioning block which can be abutted against the side wall of the side, far away from the cabinet door, of the air inlet pipe.
Through adopting above-mentioned technical scheme, when intake pipe and locating piece butt, the dead lever aligns with the fixed slot, and the dead lever of being convenient for inserts in the fixed slot, and the operation is more convenient, swift.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the flow baffle plate in the air inlet pipe can reduce the flow velocity of the air in the air inlet pipe, and is convenient for the sedimentation of impurities such as dust in the air, thereby being convenient for reducing the impurities such as dust in the air entering the cabinet body from the air inlet pipe and being beneficial to ensuring the cleanness of the cabinet body;
2. the dust collection box is provided with a dust collection box, so that sundries such as dust and the like accumulated in the dust collection box can be cleaned conveniently;
3. the bearing plate is matched with the butt block, the structure is simple, and the air inlet pipe and the inner side wall of the cabinet body can be conveniently disassembled and assembled, so that the air inlet pipe is conveniently deeply cleaned.
Drawings
Fig. 1 is an overall structure schematic diagram of a dustproof power distribution cabinet according to an embodiment of the present application.
Fig. 2 is a schematic view for showing the internal structure of the intake duct.
Fig. 3 is a schematic view showing a connection structure between the air inlet duct and the cabinet body, with the heat dissipation fan and the mounting bracket removed.
Description of reference numerals: 1. a cabinet body; 11. a cabinet door; 12. a heat dissipation fan; 13. a mounting frame; 14. an air inlet; 15. an exhaust hole; 16. a bearing plate; 17. connecting blocks; 171. a butting block; 18. a fixed block; 181. a fixing hole; 1811. fixing the rod; 182. an elastic member; 19. positioning blocks; 2. an air inlet pipe; 21. a flow baffle plate; 22. a dust falling hole; 23. a dust collection box; 231. a dust collecting box; 232. mounting holes; 233. rotating the rod; 24. a clamping block; 25. an extension block; 251. and fixing the grooves.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses dustproof switch board. Referring to fig. 1, the dustproof power distribution cabinet comprises a cabinet body 1, wherein the cabinet body 1 is in a hollow cuboid shape, and one side of the cabinet body 1 is in an open shape; a cabinet door 11 is arranged at the opening of the cabinet body 1, and the cabinet door 11 is rotatably connected with the cabinet body 1 through a hinge. A heat radiation fan 12 is arranged in the cabinet body 1, and the heat radiation fan 12 is positioned at the lower end of the cabinet body 1; the cabinet body 1 inside wall welded fastening has mounting bracket 13, and heat dissipation fan 12 passes through screw fixed connection with mounting bracket 13. Two air inlet pipes 2 are arranged in the cabinet body 1, and the two air inlet pipes 2 are both positioned below the heat dissipation fan 12; the two air inlet pipes 2 are respectively positioned at two sides of the cabinet body 1 in the width direction. The one end of every intake pipe 2 links to each other with the cabinet body 1 inside wall, and the equal tilt up setting of one end that the cabinet body 1 inside wall was kept away from to every intake pipe 2.
Referring to fig. 1, a plurality of air inlets 14 are formed in the inner side wall of the cabinet body 1 in each air inlet pipe 2, and the air inlets 14 penetrate through the cabinet body 1 in the wall thickness direction. A plurality of exhaust holes 15 are further formed in the inner side wall of the cabinet body 1, and each exhaust hole 15 penetrates along the wall thickness direction of the cabinet body 1; all the exhaust holes 15 are located above the heat radiating fan 12. After the cabinet door 11 is closed, the heat dissipation fan 12 works, and outside air enters the air inlet pipe 2 through the air inlet hole 14 and enters the cabinet body 1; the hot gas in the cabinet body 1 can be discharged out of the cabinet body 1 through the exhaust holes 15, so that the heat in the cabinet body 1 can be rapidly dissipated.
Referring to fig. 1 and 2, the air inlet pipe 2 is a rectangular pipe, a flow baffle plate 21 is welded and fixed on the inner bottom wall of the air inlet pipe 2, the flow baffle plate 21 is a rectangular plate, and a plurality of flow baffle plates 21 are sequentially arranged along the length direction of the air inlet pipe 2; a gap is arranged between the upper end wall of each flow baffle plate 21 and the inner top wall of the air inlet pipe 2 so as to allow air to pass through. After entering the air inlet pipe 2, the outside air flows through the baffle plates 21 in sequence. The air flow speed between two adjacent baffle plates 21 is low, and impurities such as dust in the air sink due to the self gravity, so that the impurities such as dust in the air entering the cabinet body 1 through the air inlet pipe 2 are reduced.
Referring to fig. 2, a plurality of dust falling holes 22 are formed through the bottom wall of the intake pipe 2 downward, and all the dust falling holes 22 are arranged in one-to-one correspondence with all the flow baffles 21. The dust falling holes 22 are rectangular holes, and each dust falling hole 22 is positioned at one side of the corresponding flow baffle plate 21 far away from the air inlet 14; the side wall of each dust falling hole 22 close to one side of the flow baffle 21 is flush with the side wall of the corresponding flow baffle 21. A dust collection box 23 is fixedly welded on the outer side wall of the air inlet pipe 2, and the dust collection box 23 is positioned on the side wall of the air inlet pipe 2 provided with a dust falling hole 22; all the dust falling holes 22 are located in the dust box 23. The impurities such as dust and the like settled in the air can slide to the dust falling hole 22 along the inner bottom wall of the air inlet pipe 2 and fall into the dust collection box 23, so that the impurities such as dust and the like are prevented from being gathered on the inner bottom wall of the air inlet pipe 2 and then being lifted along with the flowing air to enter the cabinet body 1.
Referring to fig. 2, a dust box 231 is provided in the dust box 23, the dust box 231 is a rectangular housing with an open upper end, and the dust box 231 is used for collecting impurities such as dust in the dust box 23. The outer side wall of the dust collection box 23 facing the direction of the cabinet door 11 is provided with a mounting hole 232 in a penetrating way, and the mounting hole 232 is matched with the dust collection box 231; the dust box 231 can be inserted into or pulled out of the dust box 23 through the mounting hole 232, so that the dust box 23 can be cleaned conveniently, and the operation is convenient. The side wall of the dust box 23 above the mounting hole 232 is provided with a rotating rod 233, the rotating rod 233 is a rectangular rod, and the rotating rod 233 is rotatably connected with the dust box 23 through a pin shaft. The pin shaft is axially provided along the wall thickness direction of the dust box 23, and the rotating lever 233 is rotatable in the up-down direction. When the rotating lever 233 rotates downward, the side wall of the rotating lever 233 may abut against the outer side wall of the dust box 231 located in the mounting hole 232, thereby fixing the dust box 231.
Referring to fig. 2 and 3, the cabinet body 1 is provided with a bearing plate 16, the bearing plate 16 is a rectangular plate, and one side of the bearing plate 16 is welded and fixed with the inner side wall of the cabinet body 1 provided with the air inlet 14; the receiving plate 16 is located below the air inlet pipe 2 and the upper surface of the receiving plate 16 can abut against the lower surface of the air inlet pipe 2 to support the air inlet pipe 2. The upper surface of the air inlet pipe 2 close to one end of the air inlet hole 14 is fixedly welded with a clamping block 24, and the clamping block 24 is a rectangular block. The cabinet body 1 inside wall welded fastening has connecting block 17, and connecting block 17 is the rectangle piece, and connecting block 17 is located joint piece 24 top positions. The connecting block 17 is integrally formed and fixed with an abutting block 171, and the abutting block 171 is positioned at one end of the connecting block 17 far away from the inner side wall of the cabinet body 1; the butt joint block 171 downwardly extending sets up, and the lateral wall butt of inlet port 14 direction can be kept away from with joint block 24 to the lateral wall butt of butt joint block 171 to make the end wall of intake pipe 2 keep laminating, simple structure, convenient operation with cabinet body 1 inside wall.
Referring to fig. 2 and 3, a fixing block 18 is welded and fixed on the inner side wall of the cabinet body 1 provided with the air inlet 14, and the fixing block 18 is located above the air inlet pipe 2 and close to the cabinet door 11. The fixing block 18 is provided with a fixing hole 181 penetrating in the up-down direction, the inner side wall of the fixing hole 181 is connected with a fixing rod 1811 in a sliding manner, and the fixing rod 1811 is a round rod. The upper surface of the air inlet pipe 2 is fixedly welded with an extension block 25, the upper surface of the extension block is downwards provided with a fixing groove 251, and the lower end of the fixing rod 1811 can be inserted into the fixing groove 251 to fix the air inlet pipe 2. An elastic piece 182 is arranged between the fixing rod 1811 and the inner side wall of the cabinet body 1, and the elastic piece 182 is a spring; the elastic member 182 is sleeved on the outer side wall of the upper end of the fixing rod 1811, one end of the elastic member 182 is welded and fixed with the upper surface of the fixing block 18, and the other end of the elastic member 182 is welded and fixed with the outer side wall of the fixing rod 1811. The elastic member 182 is in a stretched state; when the fixing lever 1811 is aligned with the fixing groove 251, the elastic member 182 may drive the fixing lever 1811 to automatically move downward and be inserted into the fixing groove 251.
Referring to fig. 3, a positioning block 19 is welded and fixed on the inner side wall of the cabinet body 1, and the positioning block 19 is a rectangular block. The positioning block 19 is located on one side of the air inlet pipe 2 away from the cabinet door 11. The lateral wall of locating piece 19 orientation cabinet door 11 direction can keep away from the lateral wall butt of cabinet door 11 one side with intake pipe 2, and at this moment, dead lever 1811 aligns with fixed slot 251, and intake pipe 2 installation is more convenient, swift.
The implementation principle of a dustproof power distribution cabinet in the embodiment of the application is as follows:
when the cabinet door 11 is closed, the heat dissipation fan 12 rotates, and the heat dissipation fan 12 blows the air at the bottom of the cabinet body 1 to the top of the cabinet body 1; and simultaneously, the outside air enters the air inlet pipe 2 through the air inlet hole 14. The gas entering the gas inlet pipe 2 flows through the baffle plates 21 in sequence along the length direction of the gas inlet pipe 2. The flow baffle 21 has a certain blocking effect on the gas, the gas flow rate is reduced, and impurities of dust in the gas sink to the inner bottom wall of the gas inlet pipe 2 under the action of the self gravity. The fallen dust and other foreign matters can slide down to the dust falling hole 22 and fall into the dust box in the dust box 23. The operator can rotate the rotating rod 233 to detach the dust collecting box 231 to clean up the dust and other impurities, and the operation is convenient.
Through the blockking of the baffle 21 in the intake pipe 2, debris such as dust in the gas can sink through self gravity action to reduce the debris such as dust that get into in the cabinet body 1 by intake pipe 2, guarantee the cleanness in the cabinet body 1, thereby guarantee the normal operating of the interior electric component of the cabinet body 1.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A dustproof power distribution cabinet comprises a cabinet body (1), wherein a cabinet door (11) is rotatably arranged on the cabinet body (1); the method is characterized in that: a heat radiation fan (12) is fixedly arranged at the lower end of the cabinet body (1); an air inlet pipe (2) which is inclined upwards is connected to the inner side wall of the cabinet body (1) below the heat dissipation fan (12), and a plurality of air inlets (14) penetrate through the inner side wall of the cabinet body (1) in the air inlet pipe (2) along the wall thickness direction of the cabinet body (1); the inner side wall of the cabinet body (1) above the heat dissipation fan (12) is provided with a plurality of exhaust holes (15) in a penetrating manner along the wall thickness direction of the cabinet body (1); the inner bottom wall of the air inlet pipe (2) is provided with a plurality of flow baffle plates (21) extending upwards, and the flow baffle plates (21) are sequentially arranged along the length direction of the air inlet pipe (2); and a gap is formed between the upper end wall of each flow baffle plate (21) and the inner top wall of the air inlet pipe (2).
2. The dustproof power distribution cabinet according to claim 1, characterized in that: the inner bottom wall of the air inlet pipe (2) on one side of each flow baffle plate (21) far away from the air inlet hole (14) is provided with a dust falling hole (22) in a downward penetrating manner; the outer side wall of the air inlet pipe (2) is provided with a dust collection box (23) which can cover all the dust falling holes (22).
3. The dustproof power distribution cabinet according to claim 2, characterized in that: the dust collection box (23) with an opening at the upper end is arranged in the dust collection box (23), and a mounting hole (232) for inserting the dust collection box (231) into the dust collection box (23) penetrates through the side wall of the dust collection box (23) towards the direction of the cabinet door (11).
4. The dustproof power distribution cabinet according to claim 3, characterized in that: the side wall of the dust collection box (23) provided with the mounting hole (232) is rotatably provided with a rotating rod (233) which can be abutted against the outer side wall of the dust collection box (231).
5. The dustproof power distribution cabinet according to claim 1, characterized in that: a clamping block (24) is fixedly arranged on the upper surface of the air inlet pipe (2); the inner side wall of the cabinet body (1) is fixedly provided with a connecting block (17), and the connecting block (17) is fixedly provided with an abutting block (171) which can abut against the side wall of one side, far away from the air inlet hole (14), of the clamping block (24); the inner side wall of the cabinet body (1) is fixedly provided with a bearing plate (16) which can be abutted against the lower surface of the air inlet pipe (2).
6. The dustproof power distribution cabinet according to claim 5, characterized in that: the cabinet body (1) inside wall is connected with dead lever (1811) along upper and lower direction sliding, intake pipe (2) are provided with can supply dead lever (1811) one end male fixed slot (251).
7. The dustproof power distribution cabinet according to claim 6, characterized in that: an elastic piece (182) capable of driving the fixing rod (1811) to move towards the fixing groove (251) is arranged between the fixing rod (1811) and the cabinet body (1).
8. The dustproof power distribution cabinet according to claim 6, characterized in that: the cabinet body (1) inside wall is fixedly provided with a positioning block (19) which can be abutted against the side wall of one side of the cabinet door (11) away from the air inlet pipe (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120082300.4U CN214124367U (en) | 2021-01-12 | 2021-01-12 | Dustproof power distribution cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120082300.4U CN214124367U (en) | 2021-01-12 | 2021-01-12 | Dustproof power distribution cabinet |
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| Publication Number | Publication Date |
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| CN214124367U true CN214124367U (en) | 2021-09-03 |
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| CN202120082300.4U Active CN214124367U (en) | 2021-01-12 | 2021-01-12 | Dustproof power distribution cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113766782A (en) * | 2021-09-18 | 2021-12-07 | 李龙飞 | Electrical control device using heat pump for drying |
| CN115450399A (en) * | 2022-09-30 | 2022-12-09 | 广州市羊城地下工程有限公司 | Civil air defense door frame fixing device |
-
2021
- 2021-01-12 CN CN202120082300.4U patent/CN214124367U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113766782A (en) * | 2021-09-18 | 2021-12-07 | 李龙飞 | Electrical control device using heat pump for drying |
| CN115450399A (en) * | 2022-09-30 | 2022-12-09 | 广州市羊城地下工程有限公司 | Civil air defense door frame fixing device |
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