A casting equipment for automobile hood production

Abstract

This invention discloses a casting equipment for automobile hood production, belonging to the field of casting equipment technology. It solves the problem that molten metal splashing not only poses a significant safety hazard to operators, but its high temperature can also easily damage multiple external devices. The casting equipment for automobile hood production includes a casting tank. A liquid-feeding mechanism is fixedly installed at the middle of the lower end of the casting tank. A liquid-receiving mechanism is installed below the liquid-feeding mechanism. A cover plate is fixedly welded to the lower end of the liquid-receiving mechanism. A casting mold is fitted around the cover plate, and connecting plates are fixedly welded to both sides of the front end of the casting mold. This invention achieves automatic flow and casting of molten aluminum alloy through the insertion between the liquid-feeding mechanism and the liquid-receiving mechanism, as well as the mutual cooperation between internal components. This casting method not only avoids the safety hazards of previous manual casting, but also prevents molten metal splashing inside the casting tank during the casting process.

Description

Technical Field

[0001] This invention relates to the field of casting equipment technology, specifically to a casting equipment for producing automobile hoods. Background Technology

[0002] With the rapid development of society and economy, the usage rate of automobiles is getting higher and higher. Among the various automobile production parts, the use of car covers is very widespread. Generally, the production of car covers requires casting equipment. First, a casting mold is made, and the molten metal is guided through the guide pipe. The molten metal solidifies in the cavity of the mold to form a solid. Car covers are produced on a large scale in this way. Car covers are generally made of molten aluminum alloy.

[0003] In existing mold production of car covers, the entire casting tank is usually turned over manually or by other means of movement. Regardless of the turning method, molten metal will still splash out during the turning process. This not only poses a great safety hazard to the operators, but the high temperature of the splashed molten metal can also easily damage multiple pieces of equipment on the outside. In order to solve this problem, we have proposed a casting equipment for car cover production. Summary of the Invention

[0004] The purpose of this invention is to provide a casting equipment for automobile cover production, in order to solve the problems mentioned in the background art, such as the great safety hazards to operators caused by molten metal splashing, and the high temperature that can easily damage multiple pieces of equipment on the outside.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a casting equipment for producing car covers, comprising a casting tank, a liquid discharge mechanism fixedly disposed at the middle of the lower end of the casting tank, a liquid receiving mechanism disposed below the liquid discharge mechanism, a cover plate fixedly welded to the lower end of the liquid receiving mechanism, a casting mold disposed around the cover plate, connecting plates fixedly welded to both sides of the front end of the casting mold, a jacking mechanism fixedly welded to the rear side of the upper end of the connecting plates, vertical moving mechanisms fixedly disposed on both sides of the casting tank, a linear track connected to the lower outer side of the vertical moving mechanism, and a matching beam fixedly welded to the lower inner side of the vertical moving mechanism;

[0006] The liquid receiving mechanism includes a liquid receiving pipe, and a supporting sieve plate is fixedly welded around the middle of the inner wall of the liquid receiving pipe. A long support column is fixedly welded to the middle of the upper end of the supporting sieve plate. The liquid discharging mechanism includes a liquid discharging pipe, which is configured as an inverted S-shaped structure. A nozzle is fixedly welded to the lower end of the liquid discharging pipe. An annular plate is fixedly welded around the inner wall of the nozzle. A tension spring is connected to the upper end of the annular plate. A stopper ball is connected to the upper end of the tension spring.

[0007] Preferably, the vertical movable mechanism includes a movable plate and an upper movable plate. A mating column is fixedly welded to the upper end of one side of the movable plate. A through hole is provided through the middle of one side of the upper movable plate. The mating column is inserted into the through hole of the upper movable plate. A lower fixed plate is fixedly welded to one side of the movable plate. A mating straight groove is provided laterally through the opposite end faces of the upper movable plate and the lower fixed plate. Two movable columns are movably fitted between the upper and lower mating straight grooves. A stop plate is fixedly welded to the front end of the upper movable plate and the lower fixed plate. Deep through holes are provided through the upper ends of both sides of the upper movable plate.

[0008] Preferably, a connecting strip is fixedly welded to the lower end between the two movable columns, and a rotating block is rotatably connected to both the upper and lower ends of the movable columns, with the rotating block rotatingly fitted within a mating groove.

[0009] Preferably, a support plate is fixedly welded to the inner end of the upper movable plate, and the casting tank is fixedly located on the support plate at the inner end of the two upper movable plates.

[0010] Preferably, the jacking mechanism includes a jacking block, an inner cavity groove is fixedly provided inside the front side of the jacking block, a tension spring is fixedly welded to the inner end of the inner cavity groove, and a movable block is connected to the outer end of the tension spring.

[0011] Preferably, the movable block and the movable column are in a movable fit, and both ends of the movable block are provided with inclined surfaces.

[0012] Preferably, two rotating connecting frames are fixedly welded to the inner side of the lower fixed plate, a short rotating shaft is rotatably connected between the two rotating connecting frames, and a rotating rod is connected between the two rotating connecting frames through the short rotating shaft. A protrusion is fixedly provided at the downward-sloping end of the rotating rod.

[0013] Preferably, a shaped strip is fixedly welded to the lower end of the rear side of the top moving block, and both rotating rods are located at the lower end of the support plate of the upper movable plate, with the lower end of the rotating rod and the transverse section on the shaped strip engaging movably.

[0014] Preferably, the length between the two through holes is the same as the length between the lower ends of the two movable columns.

[0015] Preferably, a connecting bracket is fixedly welded to one side of the upper end of the cover plate, and a connecting hole is provided on the inner side of the lower end of the connecting bracket. The transverse section of the connecting beam is inserted into the connecting hole of the connecting bracket.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention uses a support frame fixedly welded to the lower end of a linear track, allowing the overall support frame to support the linear track and the vertical moving mechanism. This, in turn, allows the two vertical moving mechanisms to support the entire casting tank. The casting tank is filled with molten aluminum alloy. When the entire casting tank is located at the far end between the two linear tracks, the two moving columns support the upper movable plate. A linear motor is installed on the linear track, and the slide of the linear motor is fixedly connected to the vertical moving mechanism. When the linear motor on the linear track drives the overall vertical moving mechanism... After the lateral movement of the casting tank, the jacking block can push the entire movable column and connecting strip laterally, allowing the two movable columns to be inserted into the two deep through holes respectively. This prevents the two movable columns from supporting the upper movable plate, causing the upper movable plate's vertical movement to not gradually align with the lower fixed plate. This drives the entire casting tank and liquid-feeding mechanism to move downwards. Rotating blocks can be movably connected at both ends of the movable columns, allowing them to rotatably engage with the mating grooves on the lower fixed plate. This further improves... The two movable columns move laterally in the mating straight grooves on the upper and lower sides of the upper movable plate. When the entire casting tank and the liquid-feeding mechanism move downwards, the entire liquid-feeding pipe can move downwards, causing the lower end of the liquid-feeding pipe to move vertically towards the upper end of the liquid-receiving pipe. At this time, the long support inside the liquid-receiving pipe passes through the annular plate and the tension spring to press against the stopper ball, which allows the entire stopper ball to detach from the upper end of the nozzle, thereby further reducing the seal between the stopper ball and the inside of the nozzle. Then, the liquid-feeding pipe at the lower end of the casting tank, through the connecting principle, allows the aluminum alloy to melt. The liquid flows downward through the nozzle and into the casting mold and cover plate through the receiving pipe. The insertion between the liquid discharge mechanism and the receiving mechanism, as well as the cooperation between the internal components, enable the automatic flow of the aluminum alloy molten liquid during casting. This casting method not only avoids the safety hazards of manual casting in the past, but also prevents the splashing of molten metal inside the casting tank during the casting process. The inverted S-shaped design of the liquid discharge pipe allows the molten metal to flow, thereby preventing the sedimentation of other impurities and improving the purity of the car cover plate material.

[0018] 2. In this invention, after the molten aluminum alloy inside the casting mold and cover plate gradually solidifies, a car cover plate is formed. Two rotating connecting frames are fixedly welded to the inner side of the lower fixed plate. A short rotating shaft is provided between the two rotating connecting frames, allowing the rotating rod to be connected to the lower end of the support plate. The irregularly shaped strip at the lower end of the jacking block is pushed relative to the rear side of the directly movable rotating rod. At this time, the entire vertical moving mechanism and the casting tank move laterally to the rear side under the drive of the motor on the linear track, allowing the lateral section of the irregularly shaped strip to drive the entire rotating rod. The rotational movement causes the upper end of the rotating rod to press upward against the bottom end of the upper movable plate, which in turn moves the upper movable plate upward. This lifts the casting tank on the upper movable plate. Then, the relative misalignment between the jacking block and the movable column allows the jacking block to move forward, and the movable block on one side of the jacking block drives the two movable columns to move laterally. Finally, under the obstruction of the two abutment plates, the movable columns and the deep through-hole on the upper movable plate are misaligned, allowing the two movable columns to support the deep through-hole. This design allows the casting tank to move upward during translation after pouring, automatically detaching from the pouring process. This process is not only automated but also ensures that no molten metal flows out from the pouring and receiving mechanisms during tank removal, further guaranteeing its safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 Enlarged view of the 3D structure at point A;

[0021] Figure 3 For the present invention Figure 1 Three-dimensional sectional view of the casting tank, liquid receiving mechanism and liquid unloading mechanism;

[0022] Figure 4 For the present invention Figure 3 Enlarged view of point C in the middle;

[0023] Figure 5 For the present invention Figure 1 Enlarged view of the 3D structure at point B;

[0024] Figure 6 This is a perspective view of the inner components of the overall vertical moving mechanism of the present invention;

[0025] Figure 7 This is a three-dimensional structural diagram of the other side of the vertical moving mechanism in this invention;

[0026] Figure 8 This is an enlarged three-dimensional view of the internal structure of the jacking mechanism of the present invention;

[0027] Figure 9 This is a front view of the movable column, rotating block, and connecting strip in this invention.

[0028] In the diagram: 1. Casting tank; 2. Linear track; 3. Vertical moving mechanism; 301. Movable plate; 302. Matching column; 303. Upper movable plate; 304. Deep through hole; 305. Support plate; 306. Movable column; 307. Rotating block; 308. Matching straight groove; 309. Connecting strip; 310. Lower fixed plate; 4. Casting mold; 5. Cover plate; 6. Liquid receiving mechanism; 601. Liquid receiving pipe; 602. Supporting screen plate; 603. Long support 7. Column; 8. Liquid discharge mechanism; 9. Liquid discharge pipe; 10. Annular plate; 11. Nozzle; 2. Ball stopper; 3. Tension spring; 4. Connecting plate; 5. Pushing mechanism; 6. Pushing block; 7. Irregular strip; 8. Movable block; 9. Inner cavity groove; 10. Tension spring; 11. Matching beam; 12. Connecting frame; 13. Connecting hole; 14. Rotating connecting frame; 15. Rotating short shaft. Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Please see Figures 1 to 9 An embodiment of the present invention provides a casting equipment for producing car covers, comprising a liquid discharge mechanism 7 fixedly installed at the middle of the lower end of the casting tank 1, a liquid receiving mechanism 6 installed below the liquid discharge mechanism 7, a cover plate 5 fixedly welded to the lower end of the liquid receiving mechanism 6, a casting mold 4 installed around the cover plate 5, a connecting plate 8 fixedly welded to both sides of the front end of the casting mold 4, a jacking mechanism 9 fixedly welded to the rear side of the upper end of the connecting plate 8, a vertical moving mechanism 3 fixedly installed on both sides of the casting tank 1, a linear track 2 connected to the lower outer side of the vertical moving mechanism 3, and a matching beam 10 fixedly welded to the lower inner side of the vertical moving mechanism 3;

[0031] The liquid receiving mechanism 6 includes a liquid receiving pipe 601, with a supporting sieve plate 602 fixedly welded around the middle of the inner wall of the liquid receiving pipe 601. A long support column 603 is fixedly welded to the middle of the upper end of the supporting sieve plate 602. The liquid discharging mechanism 7 includes a liquid discharging pipe 701, which is configured as an inverted S-shaped structure. A nozzle 703 is fixedly welded to the lower end of the liquid discharging pipe 701. An annular plate 702 is fixedly welded around the inner wall of the nozzle 703. A tension spring 705 is connected to the upper end of the annular plate 702, and a stopper ball 704 is connected to the upper end of the tension spring 705. The vertical moving mechanism 3 includes a movable plate 301 and an upper movable plate 303. A mating post 302 is fixedly welded to the upper end of one side of the movable plate 301. A through hole is provided through the middle of one side of the upper movable plate 303. The mating post 302 is inserted into the through hole on the upper movable plate 303. A lower fixed plate 310 is fixedly welded to one side of the movable plate 301. A mating straight groove 308 is provided transversely through the opposite end faces of the upper movable plate 303 and the lower fixed plate 310. Two movable posts 306 are provided in a movable fit between the upper and lower mating straight grooves 308. A stop plate 305 is fixedly welded to the front end of the upper movable plate 303 and the lower fixed plate 310. Deep through holes 304 are provided through the upper ends of the upper movable plate 303 on both sides.

[0032] Furthermore, a connecting strip 309 is fixedly welded to the lower end between the two movable columns 306, and a rotating block 307 is rotatably connected to both the upper and lower ends of the movable column 306. The rotating block 307 is rotatably fitted in the mating straight groove 308. A support plate is fixedly welded to the inner end of the upper movable plate 303, and the casting tank box 1 is fixedly located on the support plate at the inner end of the two upper movable plates 303.

[0033] Furthermore, the jacking mechanism 9 includes a jacking block 901. An inner cavity groove 904 is fixedly provided inside the front side of the jacking block 901. A tension spring 905 is fixedly welded to the inner end of the inner cavity groove 904. A movable block 903 is connected to the outer end of the tension spring 905. The movable block 903 is movablely engaged with the movable column 306. Both the front and rear ends of the movable block 903 are provided with inclined surfaces.

[0034] Furthermore, two rotating connecting frames 13 are fixedly welded to the inner side of the lower fixed plate 310. A rotating short shaft 15 is rotatably connected between the two rotating connecting frames 13. A rotating rod 14 is connected between the two rotating connecting frames 13 through the rotating short shaft 15. A protrusion is fixedly installed at the lower end of the rotating rod 14 at an angle. A special-shaped strip 902 is fixedly welded to the lower end of the rear side of the push block 901. Both rotating rods 14 are located at the lower end of the support plate of the upper movable plate 303. The lower end of the rotating rod 14 and the transverse section on the special-shaped strip 902 are movably engaged. The length between the two deep through holes 304 is the same as the length between the lower ends of the two movable columns 306.

[0035] By fixing and welding a support frame to the lower end of the linear track 2, the overall support frame supports the linear track 2 and the vertical movable mechanism 3, thereby allowing the two vertical movable mechanisms 3 to support the overall casting tank 1. When the casting tank 1 is filled with molten aluminum alloy and the overall casting tank 1 is located at the far end between the two linear tracks 2, the two movable columns 306 support the overall upper movable plate 303. When the linear motor on the linear track 2 drives the overall vertical movable mechanism 3 and the casting tank 1 to move laterally, the jacking block 901 can push the overall movable columns 306 and connecting strips 309 laterally, thereby allowing the two movable columns 306 to move laterally. The movable column 306 can be inserted into the two deep through holes 304 respectively, so that the two movable columns 306 cannot support the upper movable plate 303. This means that the vertical movement of the upper movable plate 303 is not a gradual contact with the lower fixed plate 310. This causes the entire casting tank 1 and the liquid discharge mechanism 7 to move downward. Rotating blocks 307 can be movably connected to the upper and lower ends of the movable column 306, so that the rotating blocks 307 at the upper and lower ends can be rotatably engaged in the mating straight grooves 308 on the lower fixed plate 310. This further improves the lateral movement of the two movable columns 306 in the mating straight grooves 308 on the upper and lower sides of the upper movable plate 303.

[0036] When the entire casting tank 1 and the liquid discharge mechanism 7 move downwards, the entire liquid discharge pipe 701 can move downwards, causing the lower end of the liquid discharge pipe 701 to move vertically towards the upper end of the receiving pipe 601. At this time, the long support 603 inside the receiving pipe 601 passes through the annular plate 702 and the tension spring 705 to press against the stopper ball 704. This allows the entire stopper ball 704 to detach from the upper end of the inside of the nozzle 703, thereby further reducing the seal between the stopper ball 704 and the inside of the nozzle 703. Then, the liquid discharge pipe 701 at the lower end of the casting tank 1, through the connecting principle, allows the aluminum alloy... The molten liquid flows downward through the nozzle 703 and then through the receiving pipe 601 into the casting mold 4 and cover plate 5. The insertion between the liquid lowering mechanism 7 and the liquid receiving mechanism 6, as well as the cooperation between the internal components, enables the automatic flow of the molten aluminum alloy during casting. This casting method not only avoids the safety hazards of manual casting in the past, but also prevents the splashing of molten metal inside the casting tank 1 during the casting process. The inverted S-shaped design of the liquid lowering pipe 701 allows the molten metal to flow, thereby preventing the settling of other impurities and improving the purity of the automotive cover plate material.

[0037] As the molten aluminum alloy inside the casting mold 4 and cover plate 5 gradually solidifies, a car cover plate is formed. Two rotating connecting frames 13 are fixedly welded to the inner side of the lower fixed plate 310. A short rotating shaft 15 is provided between the two rotating connecting frames 13, allowing the rotating rod 14 to be connected to the lower end of the support plate via the short rotating shaft 15. The irregularly shaped strip 902 at the lower end of the jacking block 901 can move directly to the rear side of the lower oblique end of the rotating rod 14 under relative pushing. At this time, the overall vertical moving mechanism 3 and the casting tank 1 move laterally to the rear under the drive of the linear motor on the linear track 2, causing the lateral section of the irregularly shaped strip 902 to drive the overall rotating rod 14 to rotate. The upper end of the rotating rod 14 can press upward against the bottom end of the upper movable plate 303, causing the upper movable plate 303 to move upward. This allows the casting tank 1 at the upper end of the upper movable plate 303 to be lifted upward. Then, the relative misalignment between the jacking block 901 and the movable column 306 allows the jacking block 901 to move forward. This causes the movable block 903 on one side of the jacking block 901 to drive the two movable columns 306 to move laterally. Finally, under the obstruction of the two abutment plates 305, the movable columns 306 and the deep through hole 304 on the upper movable plate 303 are misaligned, thereby allowing the two movable columns 306 to support the deep through hole 304. This design allows the molten metal inside the casting tank 1 to move upwards during the translation process after casting is completed, thus automatically detaching from the casting tank. This process is not only automated but also ensures that no molten metal flows out from the liquid discharge mechanism 7 and the liquid receiving mechanism 6 during the removal of the casting tank 1, further guaranteeing its safety performance. The tension spring 905 connected within the inner cavity 904 is elastic. When the inclined surface on the movable block 903 and the movable column 306 interact, the movable block 903 can retract into the inner cavity 904, causing the overall jacking mechanism 9 to gradually detach from the inner side of the vertical movable mechanism 3.

[0038] Furthermore, a connecting frame 11 is fixedly welded to one side of the upper end of the cover plate 5. A connecting hole 12 is provided on the inner side of the lower end of the connecting frame 11. The transverse section of the mating beam 10 is inserted into the connecting hole 12 of the connecting frame 11. After the mating beam 10 and the connecting frame 11 are mated, the mating beam 10 moves upward under the drive of the overall vertical moving mechanism 3, thereby driving the overall connecting frame 11 and the cover plate 5 to move upward. This allows the overall cover plate 5 to be automatically opened from the casting mold 4.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A casting equipment for producing car covers, comprising a casting tank (1), characterized in that: A liquid discharge mechanism (7) is fixedly installed at the middle of the lower end of the casting tank (1). A liquid receiving mechanism (6) is installed below the liquid discharge mechanism (7). A cover plate (5) is fixedly welded to the lower end of the liquid receiving mechanism (6). A casting mold (4) is provided around the cover plate (5). A connecting plate (8) is fixedly welded to both sides of the front end of the casting mold (4). A jacking mechanism (9) is fixedly welded to the rear side of the upper end of the connecting plate (8). A vertical moving mechanism (3) is fixedly installed on both sides of the casting tank (1). A linear track (2) is connected to the lower outer side of the vertical moving mechanism (3). A matching beam (10) is fixedly welded to the lower inner side of the vertical moving mechanism (3). The liquid receiving mechanism (6) includes a liquid receiving pipe (601), a supporting sieve plate (602) is fixedly welded around the middle of the inner wall of the liquid receiving pipe (601), and a long support column (603) is fixedly welded at the middle of the upper end of the supporting sieve plate (602). The liquid discharging mechanism (7) includes a liquid discharging pipe (701), the liquid discharging pipe (701) is configured as an inverted S-shaped structure, a nozzle (703) is fixedly welded to the lower end of the liquid discharging pipe (701), an annular plate (702) is fixedly welded around the inner wall of the nozzle (703), a tension spring (705) is connected to the upper end of the annular plate (702), and a stopper ball (704) is connected to the upper end of the tension spring (705).

2. The casting equipment for producing automobile covers according to claim 1, characterized in that: The vertical moving mechanism (3) includes a movable plate (301) and an upper movable plate (303). A mating column (302) is fixedly welded to the upper end of one side of the movable plate (301). A through hole is provided through the middle of one side of the upper movable plate (303). The mating column (302) is inserted into the through hole on the upper movable plate (303). A lower fixed plate (310) is fixedly welded to one side of the movable plate (301). A mating straight groove (308) is provided horizontally through the opposite end faces of the upper movable plate (303) and the lower fixed plate (310). Two movable columns (306) are provided movably between the upper and lower mating straight grooves (308). A stop plate (305) is fixedly welded to the front end of the upper movable plate (303) and the lower fixed plate (310). Deep through holes (304) are provided through the two sides of the upper end of the upper movable plate (303).

3. The casting equipment for producing automobile covers according to claim 2, characterized in that: A connecting strip (309) is fixedly welded to the lower end between the two movable columns (306). Rotating blocks (307) are rotatably connected to both the upper and lower ends of the movable columns (306). The rotating blocks (307) are rotatably fitted within the mating straight groove (308).

4. The casting equipment for producing automobile covers according to claim 3, characterized in that: The inner end of the upper movable plate (303) is fixedly welded with a support plate, and the casting tank (1) is fixedly located on the support plate at the inner end of the two upper movable plates (303).

5. The casting equipment for producing automobile covers according to claim 4, characterized in that: The jacking mechanism (9) includes a jacking block (901), an inner cavity groove (904) is fixedly provided inside the front side of the jacking block (901), a tension spring (905) is fixedly welded to the inner end of the inner cavity groove (904), and a movable block (903) is connected to the outer end of the tension spring (905).

6. The casting equipment for producing automobile covers according to claim 5, characterized in that: The movable block (903) and the movable column (306) are in a movable fit, and both the front and rear ends of the movable block (903) are provided with inclined surfaces.

7. The casting equipment for producing automobile covers according to claim 6, characterized in that: Two rotating connecting frames (13) are fixedly welded to the inner side of the lower fixed plate (310). A rotating short shaft (15) is rotatably connected between the two rotating connecting frames (13). A rotating rod (14) is connected between the two rotating connecting frames (13) through the rotating short shaft (15). A protrusion is fixedly provided at the lower end of the rotating rod (14).

8. The casting equipment for producing automobile covers according to claim 7, characterized in that: The lower end of the rear side of the top moving block (901) is fixedly welded with a special-shaped strip (902), and the two rotating rods (14) are both located at the lower end of the support plate of the upper movable plate (303). The lower end of the rotating rod (14) and the transverse section on the special-shaped strip (902) are in movable cooperation.

9. The casting equipment for producing automobile covers according to claim 8, characterized in that: The length between the two through holes (304) is the same as the length between the lower ends of the two movable posts (306).

10. The casting equipment for producing automobile covers according to claim 1, characterized in that: A connecting bracket (11) is fixedly welded to one side of the upper end of the cover plate (5). A connecting hole (12) is provided on the inner side of the lower end of the connecting bracket (11). The transverse section of the connecting beam (10) is inserted into the connecting hole (12) of the connecting bracket (11).

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