A modular multi-layered security door panel assembly

Abstract

The present application relates to the technical field of excavator door plate, and particularly relates to a combined multi-layer protective door plate assembly, which comprises a door plate body, one side of the door plate body is provided with a reinforcing plate, the inside of the door plate body is provided with a plurality of groups of reinforcing support blocks, the inside of the door plate body is divided into a plurality of filling channels by the plurality of groups of reinforcing support blocks, and a bearing channel is further formed in one side of the door plate body; a buffer repair assembly is arranged in the inside of the filling channel and the bearing channel. Compared with the prior art, the buffer repair assembly is arranged, the strain capacity and continuous use capacity of the door plate under complex working conditions are improved, the service life is prolonged, the maintenance cost is reduced, and the good protection performance and maintainability can be maintained in high-strength use scenarios.

Description

Technical Field

[0001] This invention relates to the field of excavator door panel technology, and more particularly to a combined multi-layer protective door panel assembly. Background Technology

[0002] In the use of construction machinery, especially heavy machinery such as excavators, protective doors are an important structure for protecting the core components of the equipment and the operators. Their performance is directly related to the safe operation of the equipment and the life safety of the operators. Protective doors are usually installed on the side wall of the cab or the outside of the engine compartment to resist external impact loads such as flying objects, mechanical impacts, and stone impacts from the work site. They also have certain heat insulation, fireproofing and corrosion resistance capabilities. Therefore, their structural strength, impact resistance and durability are key indicators for measuring the performance of protective doors.

[0003] In existing technologies, most protective door panels generally adopt a single material structure, such as steel plates or alloy plates, which are fixed by integral welding or riveting. Although they have a certain strength and rigidity, they are prone to permanent dents, cracks, or structural deformation under high-intensity continuous impact or localized stress damage, making them impossible to repair quickly or use in emergencies, and seriously affecting the continuous operation capability of the equipment. In addition, the interior of traditional door panels is usually hollow or filled with foam material, lacking an effective buffer mechanism. They cannot absorb and disperse stress when an impact occurs, and easily transmit the impact force directly to the vehicle body or operator side, posing a safety hazard. Therefore, this application discloses a combined multi-layer protective door panel assembly. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a combined multi-layer protective door panel assembly to solve the problems of the protective door panel having a simple structure, lacking buffer and repair capabilities, and being easily deformed and damaged by strong impacts.

[0005] To achieve the above objectives, the present invention provides a combined multi-layer protective door panel assembly, comprising: a door panel body, a reinforcing plate provided on one side of the door panel body, a plurality of sets of reinforcing support blocks provided inside the door panel body, the plurality of sets of reinforcing support blocks dividing the interior of the door panel body into a plurality of filling channels, a load-bearing channel also provided on one side of the door panel body, and a reinforcing strip provided on the lower front side of the door panel body. A buffer repair component is disposed inside the filling channel and the bearing channel. The buffer repair component is used to buffer the door panel body when it is impacted, and to assist the door panel body in repair after the impact. A squeezing assembly is disposed inside the bearing channel. The squeezing assembly is used to squeeze one side of the buffer repair assembly and to control the buffer repair assembly to perform auxiliary repair. The heat dissipation assembly includes an extension plate fixedly installed on one side of the reinforcing plate and a guide channel located at the bottom of the door panel body. An air outlet channel is provided at the bottom of the reinforcing strip, and the guide channel is connected to the air outlet channel. The heat dissipation assembly is used to guide and dissipate heat inside the excavator.

[0006] Preferably, the buffer repair component includes an inflatable airbag filled inside a plurality of filling channels, the bearing channel is filled with a bearing airbag, a connecting tube is provided on one side of the plurality of inflatable airbags and communicates with the bearing airbag, a control valve is provided in the middle of each connecting tube, and one side of the control valve is provided through the reinforcing plate and the extension plate.

[0007] Preferably, each set of reinforcing blocks is arranged in a triangular hollow array at equal intervals, and the inflatable airbag is filled according to the arrangement of the reinforcing blocks.

[0008] Preferably, the extrusion assembly includes a first extrusion plate and a second extrusion plate slidably installed inside the bearing channel, the first extrusion plate and the second extrusion plate being arranged opposite to each other, the bearing airbag being disposed between the first extrusion plate and the second extrusion plate, and a rotating rod being rotatably installed on one side of the bearing channel, one side of the rotating rod being disposed through one side of the door panel body, and two opposite threaded sections being respectively opened on both sides of the rotating rod, each of the two threaded sections being threadedly installed with a moving block, and a pushing block being disposed at the bottom of the moving block.

[0009] Preferably, the two push blocks are arranged opposite each other, and the side of the two push blocks closest to the first extrusion plate is set as an inclined surface.

[0010] Preferably, the inner bottom of the bearing channel is further provided with several fixing blocks, a fixing sleeve is fixedly installed above the fixing blocks, a movable sleeve is slidably installed on one side of the fixing sleeve, a fixing connecting rod is provided on one side of the movable sleeve and fixedly connected to the bottom side of the first extrusion plate, a positioning sleeve is provided in the middle of the fixing sleeve, a reverse pull rod is slidably installed inside the positioning sleeve, the side of the reverse pull rod away from the fixing connecting rod is fixedly connected to the bottom side of the second extrusion plate, a through groove is opened on the side of the reverse pull rod near the fixing connecting rod, the through groove is provided through the positioning sleeve, and a reverse drive plate is slidably installed inside the through groove.

[0011] Preferably, a first contact block is provided on both sides of the reverse drive plate, and two second contact blocks are respectively provided on the side of the movable sleeve near the fixed sleeve. The side of the first contact block near the second contact block is provided with an inclined surface, and the side of the second contact block near the first contact block is also provided with an inclined surface adapted to the first contact block.

[0012] Preferably, a return spring is provided on the side of the movable sleeve near the fixed connecting rod, and the other end of the return spring is fixedly connected to one end of the reverse pull rod.

[0013] Preferably, a heat dissipation channel is provided between the reinforcing plate and the extension plate, the heat dissipation channel is connected to one side of the guide channel, and an air inlet is provided on one side of the extension plate, the air inlet being mesh-like.

[0014] Preferably, the reinforcing plate has a plurality of guide strips on the side near the extension plate.

[0015] The beneficial effects of this invention are: 1. This type of combined multi-layer protective door panel assembly, by incorporating a buffer repair component, can quickly absorb and disperse impact energy through inflatable airbags when the door panel is impacted, effectively mitigating the damage caused by force transmission to the structure. The airbags are also arranged in an orderly manner according to the triangular hollow array of reinforcing blocks, resulting in a more balanced and stable buffer response. Simultaneously, the airbags are connected to the load-bearing airbags via connecting pipes, and with the cooperation of a control valve, they can be directionally inflated to the damaged areas for adaptive structural compensation and repair. This enhances the door panel's resilience and continuous usability under complex working conditions, extends its service life, and reduces maintenance costs, making it suitable for maintaining good protective performance and maintainability in high-intensity usage scenarios.

[0016] 2. This type of combined multi-layer protective door panel assembly, by being equipped with a compression component, allows the synchronous movement of the moving block to be controlled by a rotating rod when the repair function is activated. This pushes the first compression plate to compress the supporting airbag, and the expansion of the buffer area through gas conduction repairs the structure. Simultaneously, its bottom linkage structure, through a movable sleeve, a first contact block, and a reverse drive plate, enables the second compression plate to approach synchronously, forming a bidirectional clamping effect. This ensures that the airbag is subjected to balanced force and responds quickly during the repair process. After the repair is completed, the reset spring can automatically push the structure back to its initial state, avoiding jamming, improving the stability and efficiency of the system, making the repair process more efficient and reliable, and facilitating rapid on-site handling of structural deformation problems.

[0017] 3. This type of combined multi-layer protective door panel assembly, by setting up heat dissipation components, enables the door panel to have efficient passive heat dissipation capabilities while performing protective tasks. The heat dissipation channels, guide channels and air inlets set between the reinforcing plates and extension plates form a natural ventilation path, and the guide strip guides the airflow to flow evenly, improving the internal heat exchange efficiency, maintaining the thermal stability of the door panel structure, and preventing material aging or performance degradation caused by heat accumulation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first-view three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the second-view three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the side cross-sectional structure of the present invention; Figure 4 This is a partial cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the present invention; Figure 6 This is a schematic diagram of the buffer repair component structure of the present invention; Figure 7 This is a schematic diagram of the extrusion assembly structure of the present invention; Figure 8 This is a partial structural diagram of the extrusion assembly of the present invention; Figure 9 This is a partial cross-sectional view of the extrusion assembly of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point A in the middle.

[0020] The diagram is marked as follows: 1. Door panel body; 2. Reinforcing strip; 3. Reinforcing plate; 4. Extension plate; 5. Heat dissipation channel; 6. Guide channel; 7. Air outlet channel; 8. Guide strip; 9. Air inlet; 10. Reinforcing support block; 11. Filling channel; 12. Bearing channel; 13. Inflatable airbag; 14. Bearing airbag; 15. Connecting pipe; 16. Control valve; 17. First extrusion plate; 18. Second extrusion plate; 19. Rotating rod; 20. Threaded section; 21. Moving block; 22. Pushing block; 23. Fixing block; 24. Fixing sleeve; 25. Movable sleeve; 26. Fixing connecting rod; 27. Positioning sleeve; 28. Reverse pull rod; 29. ​​Through groove; 30. Reverse drive plate; 31. First contact block; 32. Second contact block; 33. Return spring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figures 1 to 10 As shown, the modular multi-layer protective door panel assembly includes a door panel body 1, a reinforcing plate 3 on one side of the door panel body 1, several sets of reinforcing support blocks 10 inside the door panel body 1, which divide the interior of the door panel body 1 into several filling channels 11, a load-bearing channel 12 on one side of the door panel body 1, and a reinforcing strip 2 on the lower front of the door panel body 1; a buffer repair assembly, which is located inside the filling channels 11 and the load-bearing channels 12, used to buffer when the door panel body 1 is impacted, and to assist in the repair of the door panel body 1 after impact; a compression assembly, which is located inside the load-bearing channels 12, used to compress one side of the buffer repair assembly to control the buffer repair assembly to assist in the repair; and a heat dissipation assembly, which includes an extension plate 4 fixedly installed on one side of the reinforcing plate 3, and a guide channel 6 located at the bottom of the door panel body 1, with an air outlet channel 7 at the bottom of the reinforcing strip 2, and the guide channel 6 connected to the air outlet channel 7, used to guide and dissipate heat from inside the excavator; By setting several sets of reinforcing blocks 10 inside the door panel body 1, the internal space is rationally divided into multiple filling channels 11. Combined with the external reinforcing plate 3 and reinforcing strip 2, the overall structural strength is significantly improved, which can effectively resist external impacts or shocks and enhance protective performance. The buffer repair component is set inside the filling channel 11 and the bearing channel 12, which can effectively absorb energy when the door panel is impacted and reduce the damage to the door panel. At the same time, the extrusion component applies pressure to the buffer repair component, which can activate its auxiliary repair function after the impact, improve the sustainable use of the door panel, extend its service life, and reduce maintenance costs. The heat dissipation component consists of the extension plate 4 on the side of the reinforcing plate 3 and the guide channel 6 and air outlet channel 7 at the bottom. It can guide the heat inside the excavator to be discharged through the channel while protecting it, thereby avoiding equipment failure or door panel material performance degradation caused by high temperature, effectively improving safety and structural stability. The combined multi-layer structure is adopted. Each component, such as the buffer repair module, extrusion component and heat dissipation structure, is independent and has a clear function, which improves on-site maintenance efficiency and component versatility and is suitable for a variety of complex working environments.

[0024] like Figure 5 , Figure 6 As shown, the buffer repair component includes inflatable airbags 13 filled inside several filling channels 11, and load-bearing airbags 14 filled inside the load-bearing channel 12. A connecting pipe 15 is provided on one side of several inflatable airbags 13 and is connected to the load-bearing airbags 14. A control valve 16 is provided in the middle of each connecting pipe 15. One side of the control valve 16 is provided through the reinforcing plate 3 and the extension plate 4. Each set of reinforcing blocks 10 is arranged in a triangular hollow equidistant array. The inflatable airbags 13 are filled according to the arrangement of the reinforcing blocks 10. Inflatable airbags 13 are arranged in multiple filling channels 11 and are distributed in an orderly manner according to the triangular hollow array of reinforcing blocks 10. When the door panel body 1 is subjected to external force impact, it can be evenly compressed, effectively absorb and mitigate impact energy, significantly improve the buffering capacity of the overall structure, and reduce the risk of damage. The inflatable airbags 13 and the load-bearing airbags 14 are connected by a connecting pipe 15. A control valve 16 is set in the connection. After the external force impact occurs, the airbag pressure can be adjusted according to the control command to expand and supply air to the damaged area, and fill the structural gaps in time, thereby realizing a certain degree of adaptive repair function, improving the continuity and reliability of the door panel. The control valve 16 is located in the middle of the connecting pipe 15 and extends to the external extension plate 4, so that the operator can adjust the inflation and deflation status of each inflatable airbag 13, which can facilitate differentiated compensation and repair as needed, adapt to different stress areas and damage levels, and improve the flexibility of adjustment and maintenance efficiency.

[0025] like Figures 6 to 10As shown, the extrusion assembly includes a first extrusion plate 17 and a second extrusion plate 18 slidably installed inside the bearing channel 12. The first extrusion plate 17 and the second extrusion plate 18 are arranged opposite to each other. The bearing airbag 14 is arranged between the first extrusion plate 17 and the second extrusion plate 18. A rotating rod 19 is also rotatably installed on one side of the inside of the bearing channel 12. One side of the rotating rod 19 is arranged through one side of the door panel body 1. Two opposite threaded sections 20 are opened on both sides of the rotating rod 19. A moving block 21 is threadedly installed on each of the two threaded sections 20. A pushing block 22 is provided at the bottom of the moving block 21. The two pushing blocks 22 are arranged opposite to each other. The side of the two pushing blocks 22 near the first extrusion plate 17 is set as an inclined surface. When the buffer repair function needs to be activated, the operator rotates the rotating rod 19 located on one side of the door panel body 1. The rotating rod 19 drives two moving blocks 21 on its opposite threaded sections 20 to move in opposite directions. The pushing blocks 22 at the bottom of the moving blocks 21 gradually approach and contact the first extrusion plate 17 during the sliding process. After the inclined surfaces of the two pushing blocks 22 contact the first extrusion plate 17, they gradually push it towards the second extrusion plate 18, compressing the bearing airbag 14 sandwiched between the two. This allows the gas inside the airbag to be conducted to the corresponding buffer repair area through the connecting pipe 15, expanding and filling the damaged part of the door panel body 1, thus achieving structural compensation and repair of the door panel. Subsequently, the extrusion pressure can be released by rotating the rotating rod 19 in the opposite direction, restoring the initial state of the airbag and completing a complete extrusion repair process. The rotating rod 19 is provided with opposite threaded sections 20 on both sides, and cooperates with the two moving blocks 21. By rotating the rotating rod 19, the two moving blocks 21 move synchronously in opposite directions, thereby driving the two pushing blocks 22 to push the first extrusion plate 17 in a balanced manner, ensuring that the extrusion process is stable and reliable. The bottom of the carrying channel 12 is also provided with several fixing blocks 23. A fixing sleeve 24 is fixedly installed above the fixing block 23. A movable sleeve 25 is slidably installed on one side of the fixing sleeve 24. A fixing connecting rod 26 is provided on one side of the movable sleeve 25 and is fixedly connected to the bottom side of the first extrusion plate 17. A positioning sleeve 27 is provided in the middle of the fixing sleeve 24. A reverse pull rod 28 is slidably installed inside the positioning sleeve 27. The side of the reverse pull rod 28 away from the fixing connecting rod 26 is fixedly connected to the bottom side of the second extrusion plate 18. A through groove 29 is opened on the side of the reverse pull rod 28 near the fixing connecting rod 26. 29 is provided through the positioning sleeve 27. A reverse drive plate 30 is slidably installed inside the through groove 29. First contact blocks 31 are provided on both sides of the reverse drive plate 30. Two second contact blocks 32 are provided on the side of the movable sleeve 25 near the fixed sleeve 24. The side of the first contact block 31 near the second contact block 32 is provided with an inclined surface. The side of the second contact block 32 near the first contact block 31 is also provided with an inclined surface that matches the first contact block 31. A return spring 33 is provided on the side of the movable sleeve 25 near the fixed connecting rod 26. The other end of the return spring 33 is fixedly connected to one end of the reverse pull rod 28. When the device activates the repair function, the first compression plate 17 moves along the bearing channel 12 under the push of the rotating mechanism. At the same time, the fixed connecting rod 26 at its bottom drives the movable sleeve 25 to slide into the fixed sleeve 24. During the sliding process, the second contact block 32 on the movable sleeve 25 contacts and pushes the first contact block 31 fixed on the reverse drive plate 30. The inclined surfaces of the two contact blocks interact with each other, causing the first contact block 31 to slide outward, thereby driving the reverse drive plate 30 to slide in the through groove 29. At the same time, it pushes the reverse pull rod 28 connected to the end of the reverse drive plate 30. The reverse pull rod 28 moves away from the first compression plate 17, thereby pulling the second compression plate 18 fixed on it to move closer to the first compression plate 17 along the channel, realizing the synchronous clamping operation of the two compression plates on the bearing airbag 14. During the whole process, the return spring 33 provides the return force. After the pressure is released, it can automatically drive the reverse pull rod 28 and the second compression plate 18 to return to the initial state, ensuring that the entire device has good structural restoration capability and continuous operation readiness after the repair action is completed.

[0026] like Figure 3 , Figure 4 As shown, a heat dissipation channel 5 is provided between the reinforcing plate 3 and the extension plate 4. The heat dissipation channel 5 is connected to one side of the guide channel 6. An air inlet 9 is provided on one side of the extension plate 4. The air inlet 9 is mesh-like. Several guide strips 8 are provided on the side of the reinforcing plate 3 near the extension plate 4. By setting a heat dissipation channel 5 between the reinforcing plate 3 and the extension plate 4, heat can form an effective flow path inside the structure, flowing from the guide channel 6 to the air outlet channel 7. This, together with the air inlet 9 on one side of the extension plate 4, forms natural convection, which helps to quickly dissipate the heat accumulated inside the door panel and maintain a stable internal structural temperature. Several guide strips 8 are provided on the side of the reinforcing plate 3 near the extension plate 4, which can sort and guide the airflow, making the air flow more evenly in the channel, reducing eddy interference, improving heat exchange efficiency, and helping to improve the overall heat dissipation performance of the door panel.

[0027] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0028] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A combined multi-layer protective door panel assembly, characterized in that, include: The door panel body (1) has a reinforcing plate (3) on one side, and a number of reinforcing support blocks (10) are provided inside the door panel body (1). The number of reinforcing support blocks (10) divide the interior of the door panel body (1) into a number of filling channels (11). A load-bearing channel (12) is also provided on one side of the door panel body (1). A reinforcing strip (2) is also provided below the front of the door panel body (1). A buffer repair component is disposed inside the filling channel (11) and the bearing channel (12). The buffer repair component is used to buffer the door panel body (1) when it is impacted, and to assist the door panel body (1) in repair after the impact. A squeezing assembly is disposed inside the bearing channel (12). The squeezing assembly is used to squeeze one side of the buffer repair assembly and to control the buffer repair assembly to perform auxiliary repair. The heat dissipation assembly includes an extension plate (4) fixedly installed on one side of the reinforcing plate (3) and a guide channel (6) located at the bottom of the door panel body (1). An air outlet channel (7) is provided at the bottom of the reinforcing strip (2). The guide channel (6) is connected to the air outlet channel (7). The heat dissipation assembly is used to guide and dissipate heat inside the excavator. The buffer repair assembly includes an inflatable airbag (13) filled inside a plurality of filling channels (11), and a bearing airbag (14) filled inside the bearing channel (12). A connecting pipe (15) is provided on one side of each of the plurality of inflatable airbags (13) and is connected to the bearing airbag (14). A control valve (16) is provided in the middle of each connecting pipe (15). One side of the control valve (16) passes through the reinforcing plate (3) and the extension plate (4). The extrusion assembly includes a first extrusion plate (17) and a second extrusion plate (18) slidably installed inside the bearing channel (12). The first extrusion plate (17) and the second extrusion plate (18) are arranged opposite to each other. The bearing airbag (14) is arranged between the first extrusion plate (17) and the second extrusion plate (18). A rotating rod (19) is also rotatably installed on one side of the bearing channel (12). One side of the rotating rod (19) passes through one side of the door panel body (1). Two opposite threaded sections (20) are opened on both sides of the rotating rod (19). A moving block (21) is threadedly installed on each of the two threaded sections (20). A pushing block (22) is provided at the bottom of the moving block (21). The bottom of the bearing channel (12) is also provided with several fixing blocks (23). A fixing sleeve (24) is fixedly installed above the fixing block (23). A movable sleeve (25) is slidably installed on one side of the fixing sleeve (24). A fixing connecting rod (26) is provided on one side of the movable sleeve (25) and is fixedly connected to the bottom side of the first extrusion plate (17). A positioning sleeve (27) is provided in the middle of the fixing sleeve (24). A reverse pull rod (28) is slidably installed inside the positioning sleeve (27). The side of the reverse pull rod (28) away from the fixing connecting rod (26) is fixedly connected to the bottom side of the second extrusion plate (18). (28) A through groove (29) is provided on one side near the fixed connecting rod (26). The through groove (29) passes through the positioning sleeve (27). A reverse drive plate (30) is slidably installed inside the through groove (29). A first contact block (31) is provided on both sides of the reverse drive plate (30). Two second contact blocks (32) are provided on one side of the movable sleeve (25) near the fixed sleeve (24). An inclined surface is provided on the side of the first contact block (31) near the second contact block (32). An inclined surface that matches the first contact block (31) is also provided on the side of the second contact block (32) near the first contact block (31).

2. The combined multi-layer protective door panel assembly according to claim 1, characterized in that, Each set of reinforcing blocks (10) is arranged in a triangular hollow array at equal intervals, and the inflatable airbag (13) is filled according to the arrangement of the reinforcing blocks (10).

3. The combined multi-layer protective door panel assembly according to claim 1, characterized in that, The two push blocks (22) are arranged opposite each other, and the side of the two push blocks (22) closest to the first extrusion plate (17) is set as an inclined surface.

4. The combined multi-layer protective door panel assembly according to claim 1, characterized in that, A return spring (33) is provided on the side of the movable sleeve (25) near the fixed connecting rod (26), and the other end of the return spring (33) is fixedly connected to one end of the reverse pull rod (28).

5. The combined multi-layer protective door panel assembly according to claim 1, characterized in that, A heat dissipation channel (5) is provided between the reinforcing plate (3) and the extension plate (4). The heat dissipation channel (5) is connected to one side of the guide channel (6). An air inlet (9) is provided on one side of the extension plate (4). The air inlet (9) is mesh.

6. The combined multi-layer protective door panel assembly according to claim 5, characterized in that, The reinforcing plate (3) has several guide strips (8) on the side near the extension plate (4).

Images