Combined multi-layer protective door plate assembly

Abstract

The invention relates to the technical field of excavator door plates, in particular to a combined multilayer protective door plate assembly which comprises a door plate body, a reinforcing plate is arranged on one face of the door plate body, a plurality of reinforcing supporting blocks are arranged in the door plate body, and the interior of the door plate body is divided into a plurality of filling channels by the reinforcing supporting blocks. A bearing channel is further formed in one side of the door plate body; and the buffering and repairing assembly is arranged in the filling channel and the bearing channel. Compared with the prior art, the buffer repairing assembly is arranged, the strain capacity and the continuous use capacity of the door plate under the complex working condition are improved, the service life is prolonged, the maintenance cost is reduced, and the door plate is suitable for keeping good protection performance and maintainability under the high-strength use scene.

Description

Technical Field

[0001] The present invention relates to the technical field of excavator door panels, and in particular to a combined multi-layer protective door panel assembly. Background Art

[0002] During the use of engineering construction machinery, especially heavy machinery such as excavators, the protective door panel, as an important structure for protecting the core components of the equipment and operators, its performance is directly related to the safe operation of the equipment and the life safety of the operators. The protective door panel is usually arranged on the side wall of the cab or outside the engine compartment to resist external impact loads such as flying objects, mechanical impacts, and stone impacts from the operation site, and has certain heat insulation, fire prevention, and corrosion resistance capabilities. Therefore, its structural strength, impact resistance, and durability are the key indicators for measuring the performance of the protective door panel.

[0003] In the prior art, most protective door panels generally adopt a single-material structure, such as steel plates or alloy plates fixed by integral welding or riveting. Although they have certain strength and rigidity, when subjected to high-intensity continuous impacts or local force damage, they are prone to permanent dents, cracks, or structural deformations, and cannot be quickly repaired or used emergently, seriously affecting the continuous operation ability of the equipment. In addition, the interior of the traditional door panel is usually a cavity or filled with foam materials, lacking an effective buffer mechanism, unable to absorb and disperse stress when an impact occurs, and easily transmitting the impact force directly to the vehicle body or the operator's side, posing a safety hazard. Therefore, the present application discloses a combined multi-layer protective door panel assembly. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a combined multi-layer protective door panel assembly to solve the problems of single structure of the protective door panel, lack of buffer and repair capabilities, and easy deformation and damage under strong impacts.

[0005] Based on the above purpose, the present invention provides a combined multi-layer protective door panel assembly, including: a door panel body, on one side of the door panel body, a reinforcing plate is provided; inside the door panel body, several groups of reinforcing support blocks are provided, and the several groups of reinforcing support blocks divide the interior of the door panel body into several filling channels; on one side of the door panel body, a bearing channel is further opened; and below the front surface of the door panel body, a reinforcing strip is further provided. A buffer repair assembly, which is arranged inside the filling channel and the bearing channel, and is used for buffering when the door panel body is impacted and assisting the door panel body to be repaired after the impact. An extrusion assembly, which is arranged inside the bearing channel, and is used for extruding one side of the buffer repair assembly to control the buffer repair assembly to perform auxiliary repair. Heat dissipation component, the heat dissipation component includes an extension plate fixedly installed on one side of the reinforcement plate, and a guiding channel located at the bottom of the door panel body. An air outlet channel is opened at the bottom of the reinforcement bar, and the guiding channel is communicated with the air outlet channel. The heat dissipation component is used to guide and dissipate the heat inside the excavator.

[0006] Preferably, the buffer repair component includes expansion air bags filled inside a plurality of the filling channels, a bearing air bag is filled inside the bearing channel, and a connecting pipe is arranged on one side of a plurality of the expansion air bags and communicated with the bearing air bag. Control valves are arranged in the middle of the connecting pipes, and one side of each control valve penetrates through the reinforcement plate and is arranged on the extension plate.

[0007] Preferably, each group of the reinforcement support blocks is arranged in an equidistant array in a triangular hollow shape, and the expansion air bags are filled according to the arrangement state of the reinforcement support blocks.

[0008] Preferably, the extrusion component 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 are arranged oppositely, and the bearing air bag is arranged between the first extrusion plate and the second extrusion plate. A rotating rod is also rotatably installed on one side inside the bearing channel, and one side of the rotating rod penetrates through one side of the door panel body and is arranged. Two opposite threaded sections are respectively opened on both sides of the rotating rod, and moving blocks are threadedly installed on both of the threaded sections. A pushing block is arranged at the bottom of the moving block.

[0009] Preferably, the two pushing blocks are arranged oppositely, and the sides of the two pushing blocks close to the first extrusion plate are arranged as inclined surfaces.

[0010] Preferably, a plurality of fixing blocks are further arranged at the bottom inside the bearing channel. A fixing sleeve is fixedly installed above the fixing block. An activity sleeve is slidably installed on one side of the fixing sleeve. A fixing connecting rod is arranged on one side of the activity sleeve and fixedly connected to the bottom side of the first extrusion plate. A positioning sleeve is arranged in the middle of the fixing sleeve. A reverse pull rod is slidably installed inside the positioning sleeve. One 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 one side of the reverse pull rod close to the fixing connecting rod, and the through groove penetrates through the positioning sleeve and is arranged. A reverse driving plate is slidably installed inside the through groove.

[0011] Preferably, first contact blocks are arranged on both sides of the reverse driving plate, and two second contact blocks are respectively arranged on the side of the activity sleeve close to the fixing sleeve. The side of the first contact block close to the second contact block is arranged as an inclined surface, and an inclined surface adapted to the first contact block is also opened on the side of the second contact block close to the first contact block.

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

[0013] Preferably, a heat dissipation channel is arranged between the reinforcing plate and the extension plate. The heat dissipation channel is communicated with one side of the guiding channel. An air inlet is arranged on one side of the extension plate, and the air inlet is arranged in a mesh shape.

[0014] Preferably, a plurality of guiding strips are arranged on one side of the reinforcing plate close to the extension plate.

[0015] Advantages of the present invention: 1. For this combined multi-layer protective door panel assembly, by providing a buffer repair assembly, when the door panel body is impacted, the impact energy can be quickly absorbed and dispersed by the expansion airbag, effectively reducing the degree of damage to the structure caused by force transmission. And according to the triangular hollow array of the reinforcing support blocks, the distribution is orderly, making the buffer response more balanced and stable. At the same time, the airbag is communicated with the bearing airbag through a connecting pipe, and under the cooperation of the control valve, it can be inflated directionally to the damaged part for adaptive structure compensation and repair, improving the strain capacity and continuous use capacity of the door panel under complex working conditions, extending the service life and reducing the maintenance cost, and being suitable for maintaining good protective performance and maintainability in high-intensity use scenarios.

[0016] 2. For this combined multi-layer protective door panel assembly, by providing an extrusion assembly, when activating the repair function, the synchronous movement of the moving block can be controlled by the rotating rod, pushing the first extrusion plate to compress the bearing airbag, driving the expansion and repair of the buffer area through gas conduction. At the same time, the bottom linkage structure realizes the synchronous approach of the second extrusion plate through the movable sleeve, the first contact block and the reverse driving plate, forming a two-way clamping effect, ensuring that the airbag is evenly stressed and responds quickly during the repair process. The return spring can automatically push the structure back to the initial state after the repair is completed, avoiding jamming, improving the stability and use efficiency of the system, making the repair process more efficient and reliable, and facilitating the rapid handling of structural deformation problems on site.

[0017] 3. For this combined multi-layer protective door panel assembly, by providing a heat dissipation assembly, the door panel has efficient passive heat dissipation ability while performing the protection task. Using the heat dissipation channel, guiding channel and air inlet arranged between the reinforcing plate and the extension plate to form a natural ventilation path, the guiding strips guide the air flow 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. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the first perspective of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the second perspective of the present invention; Figure 3 Schematic diagram of the side cross-sectional structure of the present invention; Figure 4 Schematic diagram of the partial cross-sectional structure of the present invention; Figure 5 Schematic diagram of the exploded structure of the present invention; Figure 6 Schematic diagram of the structure of the buffer repair component of the present invention; Figure 7 Schematic diagram of the structure of the extrusion component of the present invention; Figure 8 Schematic diagram of the partial structure of the extrusion component of the present invention; Figure 9 Schematic diagram of the partial cross-sectional structure of the extrusion component of the present invention; Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at position A in.

[0020] The markings in the figure are: 1, door panel body; 2, reinforcement strip; 3, reinforcement plate; 4, extension plate; 5, heat dissipation channel; 6, guiding channel; 7, air outlet channel; 8, guiding strip; 9, air inlet; 10, reinforcement support block; 11, filling channel; 12, bearing channel; 13, expansion 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, fixed block; 24, fixed sleeve; 25, movable sleeve; 26, fixed connecting rod; 27, positioning sleeve; 28, reverse pull rod; 29, through slot; 30, reverse drive plate; 31, first contact block; 32, second contact block; 33, return spring. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following further elaborates on the present invention in combination with specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0023] As Figures 1 to 10 shown, the combined multi-layer protection door panel assembly includes a door panel body 1. One side of the door panel body 1 is provided with a reinforcing plate 3. A number of groups of reinforcing support blocks 10 are arranged inside the door panel body 1. The number of groups of reinforcing support blocks 10 divides the interior of the door panel body 1 into a number of filling channels 11. A bearing channel 12 is also opened on one side of the door panel body 1. A reinforcing strip 2 is further provided below the front of the door panel body 1; a buffer repair component, which is arranged inside the filling channel 11 and the bearing channel 12, and is used to buffer when the door panel body 1 is impacted, and assist the door panel body 1 to be repaired after the impact; an extrusion component, which is arranged inside the bearing channel 12, and is used to extrude one side of the buffer repair component to control the buffer repair component to assist in the repair; a heat dissipation component, which includes an extension plate 4 fixedly installed on one side of the reinforcing plate 3, and a guiding channel 6 located at the bottom of the door panel body 1. An air outlet channel 7 is opened at the bottom of the reinforcing strip 2. The guiding channel 6 is communicated with the air outlet channel 7, and the heat dissipation component is used to guide and dissipate the heat inside the excavator; By arranging several groups of reinforcing support blocks 10 inside the door panel body 1, the internal space is reasonably divided into multiple filling channels 11. Combining with the external reinforcing plate 3 and reinforcing strip 2, the overall structural strength is significantly improved, effectively resisting external impacts or impact forces, enhancing the protection performance. A 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, slow down the damage to the door panel caused by the impact. 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 usability of the door panel, extend the service life, and reduce the maintenance cost. The heat dissipation component consists of an extension plate 4 on the side of the reinforcing plate 3 and a guiding channel 6 and an air outlet channel 7 at the bottom, which can guide the heat inside the excavator to be discharged through the channels while providing protection, thus avoiding equipment failures or degradation of the door panel material properties caused by high temperature, effectively enhancing safety and structural stability. Using a combined multi-layer structure, each component such as the buffer repair module, extrusion component, and heat dissipation structure is independent and has a clear function, improving the on-site repair efficiency and component versatility, and being suitable for various complex working conditions.

[0024] As Figure 5 , Figure 6 shown, the buffer repair component includes expansion airbags 13 filled inside several filling channels 11, and the bearing channel 12 is filled with a bearing airbag 14. A connecting pipe 15 is arranged on one side of several expansion airbags 13 and is connected to the bearing airbag 14. A control valve 16 is arranged in the middle of each connecting pipe 15. One side of the control valve 16 penetrates through the reinforcing plate 3 and the extension plate 4. Each group of reinforcing support blocks 10 is arranged in an equidistant array in a triangular hollow shape, and the expansion airbags 13 are filled according to the arrangement state of the reinforcing support blocks 10; The expansion airbags 13 are arranged in multiple filling channels 11 and are distributed orderly according to the triangular hollow array of the reinforcing support blocks 10. When the door panel body 1 is impacted by external forces, they can be evenly compressed, effectively absorbing and relieving the impact energy, significantly improving the buffering capacity of the overall structure, and reducing the risk of damage. The expansion airbags 13 and the bearing airbag 14 are connected through the connecting pipe 15, and a control valve 16 is arranged in the connection. After an external impact occurs, the air pressure of the airbag can be adjusted according to the control instruction, and inflated air is supplied to the damaged part to fill the structural voids in time, thus realizing a certain degree of self-adaptive repair function, improving the use continuity and reliability of the door panel. A control valve 16 is arranged in the middle of the connecting pipe 15, and the position of the control valve 16 penetrates through to the external extension plate 4, enabling the operator to adjust the inflation and deflation states of each expansion airbag 13, facilitating differential compensation and repair as needed, adapting to different stress areas and damage levels, and enhancing the flexibility of adjustment and maintenance efficiency.

[0025] As Figures 6 to 10As shown, the extrusion assembly includes a first extrusion plate 17 and a second extrusion plate 18 slidably mounted inside the bearing channel 12. The first extrusion plate 17 and the second extrusion plate 18 are arranged oppositely. The bearing airbag 14 is disposed between the first extrusion plate 17 and the second extrusion plate 18. A rotating rod 19 is rotatably mounted on one side inside the bearing channel 12. One side of the rotating rod 19 penetrates through one side of the door panel body 1. Two opposite threaded sections 20 are respectively formed on both sides of the rotating rod 19. Moving blocks 21 are threadedly mounted on both threaded sections 20. A pushing block 22 is provided at the bottom of the moving block 21. The two pushing blocks 22 are arranged oppositely. The sides of the two pushing blocks 22 close to the first extrusion plate 17 are inclined surfaces; When it is necessary to activate the buffer repair function, the operator rotates the rotating rod 19 provided on one side of the door panel body 1. The rotating rod 19 drives the two moving blocks 21 on the opposite threaded sections 20 at both ends to move in opposite directions respectively. The pushing blocks 22 at the bottoms 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, the first extrusion plate 17 is gradually pushed towards the second extrusion plate 18, compressing the bearing airbag 14 clamped therebetween, so that the gas inside the airbag is conducted to the corresponding buffer repair area through the connecting pipe 15, expands and fills the damaged part of the door panel body 1, realizing the structural compensation and repair of the door panel. Subsequently, the extrusion force can be released by rotating the rotating rod 19 in the reverse direction to restore the initial state of the airbag, completing a complete extrusion repair process. Opposite threaded sections 20 are respectively provided on both sides of the rotating rod 19, and in cooperation 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 balance the pushing pressure on the first extrusion plate 17, ensuring the stability and reliability of the extrusion process; There are also several fixing blocks 23 provided at the inner bottom of the bearing channel 12. 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 pressing 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 pressing plate 18. A through groove 29 is formed on the side of the reverse pull rod 28 close to the fixing connecting rod 26. The through groove 29 runs through the positioning sleeve 27. A reverse driving plate 30 is slidably installed inside the through groove 29. First contact blocks 31 are provided on both sides of the reverse driving plate 30. Two second contact blocks 32 are respectively provided on the side of the movable sleeve 25 close to the fixing sleeve 24. An inclined surface is provided on the side of the first contact block 31 close to the second contact block 32. An inclined surface adapted to the first contact block 31 is also formed on the side of the second contact block 32 close to the first contact block 31. A return spring 33 is provided on the side of the movable sleeve 25 close to the fixing 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 starts the repair function, the first pressing plate 17 moves along the bearing channel 12 under the push of the rotating mechanism. The fixing connecting rod 26 at its bottom simultaneously drives the movable sleeve 25 to slide into the fixing sleeve 24. The second contact block 32 on the movable sleeve 25 contacts and pushes the first contact block 31 fixed on the reverse driving plate 30 during the sliding process. The inclined surfaces of the two contact blocks interact, causing the first contact block 31 to slide outwards, thereby driving the reverse driving plate 30 to slide in the through groove 29. At the same time, the reverse pull rod 28 connected to the end of the reverse driving plate 30 is pushed. The reverse pull rod 28 moves away from the first pressing plate 17, and then pulls the second pressing plate 18 fixed on it to approach the first pressing plate 17 along the channel, realizing the synchronous clamping operation of the two pressing plates on the bearing airbag 14. During the whole process, the return spring 33 provides a return force, and can automatically drive the reverse pull rod 28 and the second pressing plate 18 to return to the initial state after the pressure is released, ensuring that the whole device has good structural restoration ability and continuous operation preparation state after completing the repair action.

[0026] As Figure 3 , Figure 4 shown, a heat dissipation channel 5 is provided between the reinforcing plate 3 and the extension plate 4. The heat dissipation channel 5 is communicated with one side of the guiding channel 6. An air inlet 9 is provided on one side of the extension plate 4. The air inlet 9 is set as a mesh. A number of guiding strips 8 are provided on the side of the reinforcing plate 3 close to the extension plate 4; By providing 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 guiding channel 6 to the air outlet channel 7. Combining with the air inlet 9 on one side of the extension plate 4 to form natural convection helps to quickly export the heat accumulated inside the door panel, maintaining the temperature stability of the internal structure. On the side of the reinforcing plate 3 close to the extension plate 4, there are several guiding strips 8, which can comb and guide the air flow, making the air flow more evenly in the channel, reducing the interference of eddy currents, improving the heat exchange efficiency, and contributing to the improvement of the overall heat dissipation performance of the door panel.

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

[0028] The present 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 principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A combined multi-layer protective door panel assembly, characterized in that: include: A door panel body (1), wherein a reinforcing plate (3) is provided on one side of the door panel body (1), a plurality of groups of reinforcing support blocks (10) are provided inside the door panel body (1), the plurality of groups of reinforcing support blocks (10) divide the interior of the door panel body (1) into a plurality of filling channels (11), a load-bearing channel (12) is also provided on one side of the door panel body (1), and a reinforcing strip (2) is also provided below the front surface of the door panel body (1); a buffer repair component, the buffer repair component being arranged inside the filling channel (11) and the bearing channel (12), the buffer repair component being used to provide buffering when the door panel body (1) is impacted, and to assist in repairing the door panel body (1) after the impact; An extrusion component, the extrusion component is arranged inside the bearing channel (12), the extrusion component is used to extrude one side of the buffer repair component, and is used to control the buffer repair component to perform auxiliary repair; A heat dissipation component, the heat dissipation component comprises an extension plate (4) fixedly mounted 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); and the heat dissipation component is used to guide and dissipate heat inside the excavator.

2. The combined multi-layer protective door panel assembly according to claim 1, characterized in that: The buffer repair component comprises an expansion airbag (13) filled in the interior of the plurality of filling channels (11), the interior of the bearing channel (12) is filled with a bearing airbag (14), one side of the plurality of expansion airbags (13) is provided with a connecting pipe (15) connected to the bearing airbag (14), the middle of each connecting pipe (15) is provided with a control valve (16), and one side of the control valve (16) is provided through the reinforcing plate (3) and the extension plate (4).

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

4. The combined multi-layer protective door panel assembly according to claim 3, characterized in that: The extrusion assembly comprises a first extrusion plate (17) and a second extrusion plate (18) which are slidably mounted 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 rotatably mounted 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 respectively provided on both sides of the rotating rod (19); moving blocks (21) are threadedly mounted on the two threaded sections (20); and a pushing block (22) is arranged at the bottom of the moving block (21).

5. The combined multi-layer protective door panel assembly according to claim 4, characterized in that: The two pushing blocks (22) are arranged opposite to each other, and one side of the two pushing blocks (22) close to the first extrusion plate (17) is arranged as an inclined surface.

6. The combined multi-layer protective door panel assembly according to claim 5, characterized in that: A plurality of fixed blocks (23) are also provided at the bottom of the bearing channel (12). A fixed sleeve (24) is fixedly installed above the fixed block (23). A movable sleeve (25) is slidably installed on one side of the fixed sleeve (24). A fixed connecting rod (26) is provided on one side of the movable sleeve (25) and is fixedly connected to one side of the bottom of the first extrusion plate (17). A positioning sleeve (27) is provided in the middle of the fixed 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 fixed connecting rod (26) is fixedly connected to one side of the bottom of the second extrusion plate (18). A through groove (29) is provided on the side of the reverse pull rod (28) close to the fixed connecting rod (26). The through groove (29) runs through the positioning sleeve (27). A reverse drive plate (30) is slidably installed inside the through groove (29).

7. The combined multi-layer protective door panel assembly according to claim 6, characterized in that: 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) close to the fixed sleeve (24); a side of the first contact block (31) close to the second contact block (32) is provided with an inclined surface; and a side of the second contact block (32) close to the first contact block (31) is also provided with an inclined surface matching the first contact block (31).

8. The combined multi-layer protective door panel assembly according to claim 7, characterized in that: A return spring (33) is provided on one side of the movable sleeve (25) close to 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).

9. 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) being connected to one side of the guide channel (6), and an air inlet (9) is provided on one side of the extension plate (4), the air inlet (9) being arranged in a mesh shape.

10. The combined multi-layer protective door panel assembly according to claim 9, characterized in that: A plurality of guide strips (8) are provided on one side of the reinforcing plate (3) close to the extending plate (4).

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