Flame-retardant anti-radiation plastic-wood composite door plate and preparation method thereof

Abstract

The invention discloses a flame-retardant anti-radiation plastic-wood composite door plate and a preparation method thereof, and belongs to the technical field of composite door plates, the flame-retardant anti-radiation plastic-wood composite door plate comprises a composite door plate body, the bottom end of the composite door plate body is provided with an insertion groove extending in the length direction of the composite door plate body, an insertion strip is detachably inserted in the insertion groove, and the bottom of the insertion strip is connected with a sealing strip for sealing and smoke prevention. Through a movable connecting mechanism composed of a strip-shaped groove, a strip-shaped plate, a sliding rod, a mounting cavity, a limiting block and a first spring, flexible and stable connection of a sealing strip and an inserting strip is achieved, the flatness and the fitting degree of the sealing strip after assembly are guaranteed by means of continuous elastic force of the first spring, and meanwhile the inserting strip is connected with the composite door plate body in an inserting mode; and a positioning mechanism composed of a mounting groove, a third spring and a positioning insertion block is matched to form double fixation, the problem that a traditional bonding type sealing strip is prone to melting, edge warping and falling off at the high temperature is thoroughly solved, and it is ensured that the structural integrity of the door plate is not damaged in the fire scene.

Description

Technical Field

[0001] This invention relates to a wood-plastic composite door panel, and more particularly to a flame-retardant and radiation-proof wood-plastic composite door panel. This invention also relates to a method for preparing a composite door panel, and more particularly to a method for preparing a flame-retardant and radiation-proof wood-plastic composite door panel, belonging to the technical field of composite door panels. Background Technology

[0002] With the increasing demands for multifunctionality and safety in the construction industry, flame-retardant and radiation-proof wood-plastic composite door panels are widely used in medical, office, and residential settings due to their combination of environmental friendliness, aesthetic appeal, and basic protective properties. Currently, the flame-retardant and radiation-proof functions of these door panels are primarily achieved by adding flame retardants (such as aluminum hydroxide and phosphorus-based flame retardants) and radiation-proof fillers (such as graphene and metal fibers) to the wood-plastic composite substrate. Through the co-molding of the fillers and substrate, the door panels achieve both flame retardancy and basic radiation shielding, thus meeting the needs of conventional usage scenarios to a certain extent.

[0003] However, most existing door panel end sealing strips are fixed by adhesive. In the event of a fire, high temperatures can easily cause the adhesive layer to melt and fail, resulting in the sealing strips lifting and falling off. This not only damages the structural integrity of the door panel but also seriously affects its sealing performance, failing to effectively block the spread of toxic fumes and posing a significant threat to personnel evacuation and life safety. In addition, the flame retardancy of the door panel relies solely on a passive barrier mechanism. Although it is a flame-retardant material, in extreme fire scenarios such as high-temperature flashover, the flame retardant is prone to failure, and the base material will still decompose and burn. It lacks the function of actively intervening in fire extinguishing, and its flame retardant effect is limited, making it difficult to effectively delay the spread of fire.

[0004] To address these issues, a flame-retardant and radiation-resistant wood-plastic composite door panel and its preparation method were designed to optimize the aforementioned problems. Summary of the Invention

[0005] The main objective of this invention is to provide a flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method. A movable connecting mechanism consisting of a strip groove, a strip plate, a sliding rod, an installation cavity, a limiting block, and a first spring achieves a flexible and stable connection between the sealing strip and the insert strip. The continuous elasticity of the first spring ensures the flatness and fit of the sealing strip after assembly. Simultaneously, the insert strip is connected to the composite door panel body via an insertion method, forming a double fixation with a positioning mechanism consisting of an installation groove, a third spring, and a positioning block. This completely solves the problem of traditional adhesive sealing strips easily melting, warping, and falling off at high temperatures, ensuring the structural integrity of the door panel remains intact in fire scenarios. The ejection mechanism, consisting of a top rod, a protective cover, and a bimetallic strip on the horizontal plate, can accurately respond to the high-temperature environment of a fire, triggering the deformation of the bimetallic strip, pushing the top rod outward, and driving the sealing strip downward through the movable connecting mechanism, ensuring a tight fit with the ground, forming a complete seal. The sealed structure effectively blocks the diffusion path of toxic fumes, providing more time for personnel evacuation and significantly improving safety. The fire extinguishing mechanism, consisting of a push-out mechanism, movable connection mechanism, guide groove, opening, spray groove, fire extinguishing dry powder canister, slide, partition, second spring, and annular groove, works in tandem. Triggered by the deformation of the bimetallic strip, the sealing of the fire extinguishing dry powder canister and the obstruction of the spray groove are simultaneously released. The high pressure inside the canister precisely sprays the fire extinguishing dry powder onto both sides of the door panel, achieving the function of extinguishing fires nearby and actively blocking the spread of fire. This overcomes the limitations of traditional plastic-wood door panels that rely solely on passive fire retardancy, significantly improving the fire retardant protection effect in extreme fire scenarios. Furthermore, the coordinated operation of each mechanism retains the inherent fire retardant and radiation-proof properties of the plastic-wood substrate while overcoming the technical shortcomings of traditional products, such as insufficient sealing reliability and lack of active fire extinguishing function, through structural innovation, resulting in greater practicality.

[0006] The objective of this invention can be achieved by adopting the following technical solution: A flame-retardant and radiation-proof wood-plastic composite door panel includes a composite door panel body. The bottom end of the composite door panel body is provided with a slot extending along its length. An insert is detachably inserted into the slot, and a sealing strip for sealing and smoke prevention is connected to the bottom of the insert. A movable connecting mechanism is provided between the insert and the sealing strip. The movable connecting mechanism is used to realize the flexible connection between the sealing strip and the insert and to allow the sealing strip to move in the vertical direction. The interior of the composite door panel body is provided with ribs distributed along its height direction, and a horizontal plate is fixed between adjacent ribs, with the top of the horizontal plate fitting against the bottom of the insert strip. A push-out mechanism is installed on the horizontal plate. The push-out mechanism can cooperate with the movable connection mechanism to drive the movable connection mechanism to move the sealing strip downward to fit the ground in a high-temperature environment. A fire extinguishing mechanism is provided between the horizontal plate and the insert strip. The fire extinguishing mechanism can be linked with the ejection mechanism to realize fire extinguishing operations on both sides of the door panel. A positioning mechanism is provided between the end of the insert and the composite door panel body. The positioning mechanism is used to fix the insert in the slot and prevent the insert from shifting along the length of the slot.

[0007] Preferably, the movable connection mechanism includes a strip groove, a strip plate, a slide rod, a mounting cavity, a limiting block, and a first spring; A strip groove is formed at the bottom of the insert and extends along its length. A strip plate is slidably embedded inside the strip groove, and the strip plate is fixedly connected to the sealing strip. Sliding rods are evenly and vertically fixed on the strip plate, and all sliding rods are penetrated by inserts; The insert has vertically opened mounting cavities that mate with the slide rods. A limiting block is slidably provided at the top of the mounting cavity, and the limiting block is fixedly connected to the top of the slide rod. A first spring is provided between the side of the limiting block near the sealing strip and the inner end face of the mounting cavity, and the first spring is sleeved on the outside of the slide rod.

[0008] Preferably, the ejection mechanism includes an ejector rod, a protective cover, and a bimetallic strip; A top rod is vertically slidably mounted on the horizontal plate, with the bottom end of the top rod corresponding to and engaging with the top end of the sliding rod; The top of the horizontal plate is fixed with a protective cover, and the top of the top rod extends into the inside of the protective cover; The inner top of the protective cover is symmetrically provided with bimetallic strips, and the bottom surface of the bimetallic strips is in close contact with the top surface of the top rod.

[0009] Preferably, the fire extinguishing mechanism includes a guide channel, a through-hole, a spray channel, a dry powder extinguishing canister, a slide, a baffle, a second spring, and an annular groove; The guide grooves are located at both ends inside the horizontal plate, and the opposite ends of the two sets of guide grooves are provided with openings that communicate with the bottom of the horizontal plate. Both sides of the insert are provided with spray grooves, and the two sets of spray grooves are respectively connected to the openings on both sides of the horizontal plate; Both ends of the top of the horizontal plate are fitted with fire extinguishing dry powder canisters, which are connected to the inside of the guide groove. The bottom of the fire extinguishing dry powder canister is slidably equipped with a partition, and both ends of the horizontal plate are provided with sliding grooves that cooperate with the partition. A second spring is provided between the end of the chute and the partition plate, and the ends of the two sets of partition plates away from the second spring are tightly fitted with the side of the top rod; An annular groove adapted to the partition is provided at the middle position of the top rod.

[0010] Preferably, the bimetallic strip is a copper-zinc alloy bimetallic strip or an iron-nickel alloy bimetallic strip, and the deformation temperature of the bimetallic strip is 80-120℃; The protective cover is made of high-temperature resistant ceramic or flame-retardant ABS plastic, and its side wall has several ventilation holes with a diameter of 1-2mm, which are evenly distributed around the circumference of the protective cover.

[0011] Preferably, the positioning mechanism includes a mounting groove, a positioning block, and a third spring; The mounting slot is located at the top of the insert, and a positioning block is vertically slidably installed inside the mounting slot; A third spring is provided between the bottom end of the positioning block and the inner bottom of the mounting groove; The end of the positioning block away from the third spring has an arc-shaped bevel, and the positioning block extends out of the mounting groove in its natural state.

[0012] Preferably, the composite door panel body has 4-6 ribs spaced apart along the height direction, the ribs have a rectangular cross-section, the rib thickness is 1 / 3-1 / 2 of the thickness of the composite door panel body, and the ribs are integrally formed with the composite door panel body.

[0013] Preferably, the sealing strip is a blend of flame-retardant PVC and conductive carbon black, the sealing strip is L-shaped, and the outer side of the sealing strip is flush with the surface of the composite door panel.

[0014] Preferred: The strip plate and the sealing strip are integrally formed, and the inner wall of the strip groove is provided with a graphite lubricating layer.

[0015] This invention also provides a method for preparing a flame-retardant and radiation-resistant wood-plastic composite door panel, comprising the following steps: Step 1: Raw material pretreatment and mixing: Dry the wood fiber to a moisture content of ≤3% and pass it through an 80-120 mesh sieve; crush the thermoplastic plastic into 20-40 mesh particles; weigh out 50-65 parts by weight of wood fiber, 30-40 parts by weight of thermoplastic plastic, 8-12 parts by weight of flame retardant, 3-8 parts by weight of radiation shielding filler, 0.3-0.5 parts by weight of coupling agent, and 1-2 parts by weight of lubricant, put them into a high-speed mixer, and stir at 100-120℃ for 15-20 minutes to obtain a premix. Step 2: Molding of the composite door panel body: The premixed material is fed into a twin-screw extruder and melt-blended and extruded into a blank at 160-200℃ and screw speed of 30-50r / min; the blank is fed into a mold and molded at 20-25MPa pressure and 170-190℃; after cooling to below 60℃, it is demolded to obtain a composite door panel body with 4-6 rectangular ribs in one piece; then a slot is opened at the bottom of the composite door panel body. Step 3: Assembly of the movable connecting mechanism: A strip groove is made at the bottom of the insert, and a graphite lubricating layer is coated on the inner wall of the strip groove; after the strip plate and the sealing strip are integrally formed, they are slidably embedded into the strip groove; a slide rod is fixed at the top of the strip plate, and a first spring is sleeved on the outside of the slide rod and then inserted into the mounting cavity; a limit block is fixed at the top of the slide rod. Step 4: Installation of the ejection mechanism and fire extinguishing mechanism: Fix the bimetallic strip to the top of the inner cover, slide the ejector rod through the horizontal plate and make the top end fit with the bimetallic strip to fix the cover; open the guide groove and the through hole in the horizontal plate, put in the fire extinguishing dry powder canister, install the second spring and the partition in the sliding groove, so that the partition fits with the side of the ejector rod, and finally install the horizontal plate integrating the ejection mechanism and the fire extinguishing mechanism between the adjacent ribs; Step 5: Positioning mechanism assembly and insert fixing: A mounting groove is made at the end of the insert, and the third spring and the positioning block are installed in sequence; the insert with the assembled movable connecting mechanism is inserted into the slot and guided into place by the arc-shaped inclined surface of the positioning block to fix the insert; Step 6: After the insert is fixed, align the bottom of the top rod with the slide rod, and align the through-hole with the spray groove to ensure precise linkage of each mechanism. The assembly is complete, and the flame-retardant and radiation-proof wood-plastic composite door panel is obtained.

[0016] The beneficial effects of this invention are as follows: This invention provides a flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method. Through a movable connection mechanism composed of a strip groove, a strip plate, a sliding rod, an installation cavity, a limiting block, and a first spring, a flexible and stable connection between the sealing strip and the insert strip is achieved. The continuous elasticity of the first spring ensures the flatness and fit of the sealing strip after assembly. At the same time, the insert strip is connected to the composite door panel body by an insertion method. Together with the positioning mechanism composed of the installation groove, a third spring, and a positioning insert block, a double fixation is formed, which completely solves the problem of traditional adhesive sealing strips easily melting, curling, and falling off at high temperatures, ensuring that the structural integrity of the door panel is not damaged in a fire scenario. The ejection mechanism, consisting of a top rod, a protective cover, and a bimetallic strip on the horizontal plate, can accurately respond to the high-temperature environment of a fire, triggering the deformation of the bimetallic strip, pushing the top rod outward, and driving the sealing strip downward through the movable connecting mechanism, so that it fits tightly with the ground, forming a fully enclosed sealing structure, effectively blocking the diffusion path of toxic smoke, buying more time for personnel evacuation, and greatly improving the safety performance of use. The fire extinguishing mechanism, consisting of an ejection mechanism, a movable connection mechanism, a guide groove, an opening, a spray groove, a dry powder extinguishing canister, a sliding groove, a partition, a second spring, and an annular groove, is linked together. After the bimetallic strip deforms and triggers, the sealing state of the dry powder extinguishing canister and the obstruction of the spray groove are simultaneously released. The high pressure inside the canister is used to accurately spray the dry powder extinguishing agent onto both sides of the door panel, achieving the function of extinguishing fire nearby and actively blocking the spread of fire. This breaks through the limitation of traditional plastic wood door panels that only rely on passive isolation for flame retardancy, significantly improving the flame retardant protection effect in extreme fire scenarios. In addition, the coordinated operation of each mechanism not only retains the basic flame retardant and radiation-proof properties of the plastic wood substrate itself, but also makes up for the technical shortcomings of traditional products, such as insufficient sealing reliability and lack of active fire extinguishing function, through structural innovation, making it more practical. Attached Figure Description

[0017] Figure 1This is an exploded view of the bottom end of the composite door panel body in a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention. Figure 2 This is a cross-sectional view of the bottom end of a preferred embodiment of a flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method according to the present invention. Figure 3 This is a partial cross-sectional view of the bottom end of the composite door panel body in a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention. Figure 4 This is a cross-sectional view of the assembly of the ejection mechanism and the fire extinguishing mechanism on the horizontal plate in a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention. Figure 5 This is a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention. Figure 2 Enlarged view of point A in the middle; Figure 6 This is a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention. Figure 2 Enlarged view at point B in the middle; Figure 7 This is a cross-sectional view of the insert strip in a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention. Figure 8 This is a preferred embodiment of the installation structure of the insert and sealing strip in the present invention, which describes a flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method. Figure 9 This is a structural diagram of the inner side of the sealing strip in a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention; Figure 10 This is a front view of the composite door panel body in a preferred embodiment of the flame-retardant and radiation-proof wood-plastic composite door panel and its preparation method of the present invention.

[0018] In the diagram: 1. Composite door panel body; 2. Slot; 3. Insert strip; 4. Sealing strip; 5. Movable connecting mechanism; 501. Strip groove; 502. Strip plate; 503. Slide rod; 504. Mounting cavity; 505. Limiting block; 506. First spring; 6. Horizontal board; 7. Ejection mechanism; 701. Ejector rod; 702. Protective cover; 703. Bimetallic strip; 8. Fire extinguishing mechanism; 801. Guide channel; 802. Through port; 803. Spray channel; 804. Fire extinguishing dry powder canister; 805. Slide channel; 806. Baffle plate; 807. Second spring; 808. Annular groove; 9. Positioning mechanism; 901. Mounting slot; 902. Positioning block; 903. Third spring. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0020] like Figures 1-10 As shown, this embodiment provides a flame-retardant and radiation-proof wood-plastic composite door panel, including a composite door panel body 1. The bottom end of the composite door panel body 1 is provided with a slot 2 extending along its length direction. An insert 3 is detachably inserted into the slot 2, and a sealing strip 4 for sealing and smoke prevention is connected to the bottom of the insert 3. A movable connecting mechanism 5 is provided between the insert strip 3 and the sealing strip 4. The movable connecting mechanism 5 is used to realize the flexible connection between the sealing strip 4 and the insert strip 3 and to allow the sealing strip 4 to move in the vertical direction. The interior of the composite door panel body 1 is provided with ribs distributed along its height direction, and a horizontal plate 6 is fixed between adjacent ribs. The top of the horizontal plate 6 is attached to the bottom of the insert strip 3. A push-out mechanism 7 is installed on the horizontal plate 6. The push-out mechanism 7 can cooperate with the movable connecting mechanism 5. In a high-temperature environment, the movable connecting mechanism 5 drives the sealing strip 4 to move downward to fit the ground. A fire extinguishing mechanism 8 is provided between the horizontal plate 6 and the insert strip 3. The fire extinguishing mechanism 8 can be linked with the ejection mechanism 7 to realize fire extinguishing operations on both sides of the door panel. A positioning mechanism 9 is provided between the end of the insert 3 and the composite door panel body 1. The positioning mechanism 9 is used to fix the insert 3 in the slot 2 to prevent the insert 3 from shifting along the length direction of the slot 2.

[0021] General working principle: When a fire occurs, the ambient temperature rises to 80-120℃. The vents on the side wall of the protective cover 702 quickly conduct heat to the internal bimetallic strip 703. The bimetallic strip 703 deforms and bulges downwards when heated, pushing the top rod 701 to slide vertically downwards along the horizontal plate 6. The bottom end of the top rod 701 contacts the top end of the sliding rod 503 and applies a downward thrust. Through the movable connecting mechanism 5, the sealing strip 4 moves down synchronously until the sealing strip 4 is tightly attached to the ground, forming a fully sealed structure to block the diffusion of toxic smoke. At the same time, during the downward movement of the top rod 701, the annular groove 808 in its middle position moves down to the position corresponding to the partition 806. Under the elastic force of the second spring 807, the partition 806 slides into the annular groove 808, releasing the seal on the bottom end of the fire extinguishing dry powder canister 804. The dry extinguishing powder in the dry powder canister 804 enters the guide groove 801 under its own pressure, and is precisely sprayed onto both sides of the door panel through the opening 802 and the spray groove 803, achieving on-site fire extinguishing. Throughout the process, the positioning mechanism 9 keeps the insert 3 fixed in the slot 2, preventing the insert 3 from shifting and affecting the sealing and fire extinguishing effect. All mechanisms work together to simultaneously perform the functions of sealing and smoke prevention, and active fire extinguishing. Combined with the flame-retardant and radiation-proof basic properties of the composite door panel body 1, the protection effect in fire scenarios is improved.

[0022] In this embodiment, the movable connection mechanism 5 includes a strip groove 501, a strip plate 502, a slide rod 503, a mounting cavity 504, a limiting block 505, and a first spring 506; A strip groove 501 is formed at the bottom of the insert 3 and extends along its length. A strip plate 502 is slidably embedded inside the strip groove 501, and the strip plate 502 is fixedly connected to the sealing strip 4. Slide rods 503 are evenly and vertically fixed on the strip plate 502, and all slide rods 503 pass through the insert strip 3; The insert 3 has a vertically opening mounting cavity 504 that mates with the slide rod 503. A limiting block 505 is slidably provided on the top of the mounting cavity 504, and the limiting block 505 is fixedly connected to the top of the slide rod 503. A first spring 506 is provided between the side of the limiting block 505 near the sealing strip 4 and the inner end face of the mounting cavity 504. The first spring 506 is sleeved on the outside of the slide rod 503.

[0023] Local working principle: Under normal conditions, the spring force of the first spring 506 pushes the limiting block 505, which drives the slide rod 503, the strip plate 502 and the sealing strip 4 to keep them in a close fit, ensuring the flatness of the sealing strip 4 after assembly; when the top rod 701 applies a downward pushing force, the slide rod 503 drives the strip plate 502 to slide downward along the strip groove 501, realizing the vertical downward movement of the sealing strip 4 and meeting the sealing requirements.

[0024] In this embodiment, the ejection mechanism 7 includes an ejector rod 701, a protective cover 702, and a bimetallic strip 703; A top rod 701 is vertically slidably mounted on the horizontal plate 6, and the bottom end of the top rod 701 is correspondingly engaged with the top end of the sliding rod 503. A protective cover 702 is fixed to the top of the horizontal plate 6, and the top of the top rod 701 extends into the interior of the protective cover 702. The inner top of the protective cover 702 is symmetrically provided with bimetallic strips 703, and the bottom surface of the bimetallic strips 703 is in close contact with the top surface of the top rod 701.

[0025] Local working principle: Under normal conditions, the bimetallic strip 703 remains horizontal, with its bottom surface tightly fitted to the top surface of the push rod 701. When the ambient temperature reaches a set value, the bimetallic strip 703 bends and deforms due to the different thermal expansion coefficients of the two metals, bulging downwards and applying a continuous downward pushing force to the push rod 701. The push rod 701 slides along the vertical channel of the horizontal plate 6, transmitting the deformation force of the bimetallic strip 703 to the slide rod 503 of the movable connecting mechanism 5, thereby realizing the ejection and fitting action of the sealing strip 4.

[0026] In this embodiment, the fire extinguishing mechanism 8 includes a guide groove 801, a through-hole 802, a spray groove 803, a fire extinguishing dry powder canister 804, a sliding groove 805, a partition 806, a second spring 807, and an annular groove 808. The guide grooves 801 are opened at both ends inside the horizontal plate 6, and the opposite ends of the two sets of guide grooves 801 are provided with openings 802 that communicate with the bottom of the horizontal plate 6. Both sides of the insert 3 are provided with spray grooves 803, and the two sets of spray grooves 803 are respectively connected to the openings 802 on both sides of the horizontal plate 6. Both ends of the top of the horizontal plate 6 are fitted with fire extinguishing dry powder canisters 804, and the fire extinguishing dry powder canisters 804 are internally connected to the guide groove 801. A partition 806 is slidably provided at the bottom of the fire extinguishing dry powder canister 804, and both ends of the horizontal plate 6 are provided with sliding grooves 805 that cooperate with the partition 806. A second spring 807 is provided between the end of the slide 805 and the partition 806, and the ends of the two partitions 806 away from the second spring 807 are tightly fitted with the side of the top rod 701. An annular groove 808 adapted to the partition plate 806 is provided at the middle position of the top rod 701.

[0027] Local working principle: Under normal conditions, the second spring 807 is in a compressed state, pushing the partition 806 to press tightly against the side of the top rod 701. The partition 806 blocks the bottom outlet of the fire extinguishing dry powder canister 804 to prevent leakage of fire extinguishing dry powder. When the top rod 701 moves down, the annular groove 808 on its side wall gradually aligns with the partition 806. After alignment, the compression force of the second spring 807 is released, pushing the partition 806 to slide into the annular groove 808, and the outlet of the fire extinguishing dry powder canister 804 is opened. The fire extinguishing dry powder in the fire extinguishing dry powder canister 804 flows into the guide groove 801 under high pressure. The guide groove 801 is connected to the opening 802 at the bottom of the horizontal plate 6. The opening 802 is aligned with the spray grooves 803 on both sides of the insert 3. Finally, the fire extinguishing dry powder is sprayed onto both sides of the door panel through the spray grooves 803, covering the fire source around the door panel, realizing active fire extinguishing and preventing the fire from spreading to the door panel.

[0028] In this embodiment, the bimetallic strip 703 is a copper-zinc alloy bimetallic strip or an iron-nickel alloy bimetallic strip, and the deformation temperature of the bimetallic strip 703 is 80-120°C. The protective cover 702 is made of high-temperature resistant ceramic or flame-retardant ABS plastic, and its side wall has several ventilation holes with a diameter of 1-2mm, which are evenly distributed around the circumference of the protective cover 702.

[0029] Local working principle: The deformation temperature of the bimetallic strip 703 is 80-120℃. This deformation temperature setting can prevent the bimetallic strip 703 from malfunctioning due to high temperatures outside of a fire, and can also respond quickly in the early stages of a fire. The protective cover 702 is made of high-temperature resistant ceramic or flame-retardant ABS plastic. Both materials can isolate the bimetallic strip 703 from direct damage by external flames and high-temperature smoke, ensuring that it remains functional during the critical stage of triggering deformation. In the early stage of a fire, high-temperature smoke or heat enters the interior of the protective cover 702 evenly through the vents and acts directly on the bimetallic strip 703, preventing the protective cover 702 from forming a heat insulation barrier that would delay the heating of the bimetallic strip 703 and ensuring the timeliness of deformation triggering.

[0030] In this embodiment, the positioning mechanism 9 includes a mounting groove 901, a positioning block 902, and a third spring 903; The mounting groove 901 is opened at the top of the insert 3, and the positioning insert 902 is vertically slidably arranged inside the mounting groove 901; A third spring 903 is provided between the bottom end of the positioning block 902 and the inner bottom of the mounting groove 901; The positioning block 902 has an arc-shaped inclined surface at the end away from the third spring 903, and the positioning block 902 extends out of the mounting groove 901 in its natural state.

[0031] Partial working principle: When the insert 3 is inserted into the slot 2 of the composite door panel body 1, the arc-shaped inclined surface at the top of the positioning block 902 contacts and is compressed against the inner wall of the slot 2, causing the positioning block 902 to retract into the mounting groove 901, while simultaneously compressing the third spring 903. After the insert 3 is fully inserted into the slot 2, the positioning block 902 moves to the corresponding positioning position on the inner wall of the slot 2, releasing the compression force of the third spring 903, pushing the positioning block 902 out of the mounting groove 901 and embedding it into the positioning structure of the slot 2. The positioning block 902, mounting groove 901, and third spring 903 cooperate to form an axial fixation, preventing the insert 3 from shifting along the length of the slot 2, ensuring the relative position stability of the insert 3 and the horizontal plate 6, and guaranteeing the precise coordination between the ejection mechanism 7, the movable connection mechanism 5, and the fire extinguishing mechanism 8.

[0032] In this embodiment, 4-6 ribs are spaced apart along the height direction inside the composite door panel body 1. The ribs have a rectangular cross-section and a thickness of 1 / 3-1 / 2 of the thickness of the composite door panel body 1. The ribs are integrally formed with the composite door panel body 1.

[0033] Local working principle: The ribs disperse the external forces on the composite door panel body 1 through their own structural strength, preventing the composite door panel body 1 from deforming under installation, use or fire impact. At the same time, they provide a stable installation support surface for the horizontal plate 6, ensuring that the ejection mechanism 7 and fire extinguishing mechanism 8 on the horizontal plate 6 can accurately cooperate with the corresponding structure on the insert strip 3, thus ensuring the operational stability of each functional mechanism.

[0034] In this embodiment, the sealing strip 4 is a blend of flame-retardant PVC and conductive carbon black. The sealing strip 4 is made of a blend of flame-retardant PVC and conductive carbon black, which has both flame-retardant and conductive properties. Combined with the radiation protection performance of the composite door panel body 1, it further enhances the overall radiation protection effect. The sealing strip 4 is L-shaped, and the outer side of the sealing strip 4 is flush with the surface of the composite door panel body 1.

[0035] In this embodiment, the strip plate 502 and the sealing strip 4 are integrally formed, and the inner wall of the strip groove 501 is provided with a graphite lubricating layer.

[0036] Local working principle: The graphite lubricating layer coated on the inner wall of the strip groove 501 has excellent lubrication performance, reducing the sliding friction between the strip plate 502 and the inner wall of the strip groove 501. This allows the strip plate 502 to slide smoothly up and down along the strip groove 501 under the drive of the slide rod 503, avoiding the sealing strip 4 from failing to move down and fit the ground in time due to excessive frictional resistance, thus ensuring a rapid response of the sealing action.

[0037] like Figures 1-9 As shown in the figure, this embodiment provides a method for preparing a flame-retardant and radiation-resistant wood-plastic composite door panel. The process is as follows: Step 1: Raw material pretreatment and mixing: Dry the wood fiber to a moisture content of ≤3% and pass it through an 80-120 mesh sieve; crush the thermoplastic plastic into 20-40 mesh particles; weigh out 50-65 parts by weight of wood fiber, 30-40 parts by weight of thermoplastic plastic, 8-12 parts by weight of flame retardant, 3-8 parts by weight of radiation shielding filler, 0.3-0.5 parts by weight of coupling agent, and 1-2 parts by weight of lubricant, put them into a high-speed mixer, and stir at 100-120℃ for 15-20 minutes to obtain a premix. Step 2: Molding of composite door panel body 1: The premixed material is fed into a twin-screw extruder and melt-blended and extruded into a blank at 160-200℃ and screw speed of 30-50r / min; the blank is fed into a mold and molded at 20-25MPa pressure and 170-190℃; after cooling to below 60℃, it is demolded to obtain an integrally molded composite door panel body 1 with 4-6 rectangular ribs; then a slot 2 is opened at the bottom end of the composite door panel body 1. Step 3: Assembly of the movable connecting mechanism 5: A strip groove 501 is opened at the bottom of the insert 3, and a graphite lubricating layer is coated on the inner wall of the strip groove 501; after the strip plate 502 and the sealing strip 4 are integrally formed, they are slidably embedded into the strip groove 501; a slide rod 503 is fixed at the top of the strip plate 502, and a first spring 506 is sleeved on the outside of the slide rod 503 and then inserted into the mounting cavity 504; a limiting block 505 is fixed at the top of the slide rod 503. Step 4: Installation of ejection mechanism 7 and fire extinguishing mechanism 8: Fix the bimetallic strip 703 to the top of the protective cover 702, slide the push rod 701 through the horizontal plate 6 and make its top end fit with the bimetallic strip 703, and fix the protective cover 702; make guide groove 801 and through opening 802 in the horizontal plate 6, put in the fire extinguishing dry powder canister 804, install the second spring 807 and partition 806 in the sliding groove 805, so that the partition 806 fits with the side of the push rod 701, and finally install the horizontal plate 6 integrating ejection mechanism 7 and fire extinguishing mechanism 8 between adjacent ribs; Step 5: Assemble the positioning mechanism 9 and fix the insert 3: Open the mounting groove 901 at the end of the insert 3, and install the third spring 903 and the positioning block 902 in sequence; insert the insert 3 with the assembled movable connecting mechanism 5 into the slot 2, and guide it into place through the arc-shaped inclined surface of the positioning block 902 to fix the insert 3. Step 6: After the insert 3 is fixed, align the bottom end of the top rod 701 with the slide rod 503, and align the through 802 with the spray groove 803 to ensure precise linkage of each mechanism. The assembly is complete, and the flame-retardant and radiation-proof wood-plastic composite door panel is obtained.

[0038] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A flame-retardant and radiation-proof wood-plastic composite door panel, comprising a composite door panel body (1), characterized in that: The bottom end of the composite door panel body (1) is provided with a slot (2) extending along its length direction. A strip (3) is detachably inserted into the slot (2). A sealing strip (4) for sealing and smoke prevention is connected to the bottom of the strip (3). A movable connecting mechanism (5) is provided between the insert (3) and the sealing strip (4). The movable connecting mechanism (5) is used to realize the flexible connection between the sealing strip (4) and the insert (3) and allow the sealing strip (4) to move in the vertical direction. The interior of the composite door panel body (1) is provided with ribs distributed along its height direction, and a horizontal plate (6) is fixed between adjacent ribs. The top of the horizontal plate (6) is attached to the bottom of the insert (3). A push-out mechanism (7) is installed on the horizontal plate (6). The push-out mechanism (7) can cooperate with the movable connection mechanism (5) to drive the movable connection mechanism (5) to move the sealing strip (4) downward to fit the ground in a high-temperature environment. A fire extinguishing mechanism (8) is provided between the horizontal plate (6) and the insert (3). The fire extinguishing mechanism (8) can be linked with the ejection mechanism (7) to realize fire extinguishing operations on both sides of the door panel. A positioning mechanism (9) is provided between the end of the insert (3) and the composite door panel body (1). The positioning mechanism (9) is used to fix the insert (3) in the slot (2) to prevent the insert (3) from shifting along the length direction of the slot (2).

2. The flame-retardant and radiation-proof wood-plastic composite door panel according to claim 1, characterized in that: The movable connection mechanism (5) includes a strip groove (501), a strip plate (502), a slide rod (503), a mounting cavity (504), a limiting block (505), and a first spring (506); A strip groove (501) is formed at the bottom of the insert (3) and extends along its length. A strip plate (502) is slidably embedded inside the strip groove (501). The strip plate (502) is fixedly connected to the sealing strip (4). Slide rods (503) are evenly and vertically fixed on the strip plate (502), and all slide rods (503) pass through the insert strip (3); The insert (3) has a vertically opening mounting cavity (504) that matches the slide rod (503) one by one. A limiting block (505) is slidably provided on the top of the mounting cavity (504), and the limiting block (505) is fixedly connected to the top of the slide rod (503). A first spring (506) is provided between the side of the limiting block (505) near the sealing strip (4) and the inner end face of the mounting cavity (504), and the first spring (506) is sleeved on the outside of the slide rod (503).

3. The flame-retardant and radiation-proof wood-plastic composite door panel according to claim 2, characterized in that: The ejection mechanism (7) includes an ejector rod (701), a protective cover (702), and a bimetallic strip (703). A top rod (701) is vertically slidably mounted on the horizontal plate (6), and the bottom end of the top rod (701) is correspondingly matched with the top end of the sliding rod (503); The top of the horizontal plate (6) is fixed with a protective cover (702), and the top of the top rod (701) extends into the interior of the protective cover (702); The inner top of the cover (702) is symmetrically provided with bimetallic strips (703), and the bottom surface of the bimetallic strips (703) is closely attached to the top surface of the top rod (701).

4. The flame-retardant and radiation-proof wood-plastic composite door panel according to claim 3, characterized in that: The fire extinguishing mechanism (8) includes a guide channel (801), a through-hole (802), a spray channel (803), a fire extinguishing dry powder canister (804), a slide (805), a partition (806), a second spring (807), and an annular groove (808). The guide grooves (801) are opened at both ends inside the horizontal plate (6), and the opposite ends of the two sets of guide grooves (801) are provided with openings (802) that communicate with the bottom of the horizontal plate (6). Both sides of the insert (3) are provided with spray grooves (803), and the two sets of spray grooves (803) are respectively connected to the through openings (802) on both sides of the horizontal plate (6); Both ends of the top of the horizontal plate (6) are fitted with fire extinguishing dry powder canisters (804), and the fire extinguishing dry powder canisters (804) are connected to the inside of the guide groove (801); The bottom end of the fire extinguishing dry powder canister (804) is slidably provided with a partition (806), and both ends of the inside of the horizontal plate (6) are provided with sliding grooves (805) that cooperate with the partition (806). A second spring (807) is provided between the end of the slide (805) and the partition (806), and the ends of the two partitions (806) away from the second spring (807) are tightly fitted with the side of the top rod (701); An annular groove (808) adapted to the partition plate (806) is provided at the middle position of the top rod (701).

5. The flame-retardant and radiation-proof wood-plastic composite door panel according to claim 3, characterized in that: The bimetallic strip (703) is a copper-zinc alloy bimetallic strip or an iron-nickel alloy bimetallic strip, and the deformation temperature of the bimetallic strip (703) is 80-120℃; The protective cover (702) is made of high-temperature resistant ceramic or flame-retardant ABS plastic, and its sidewalls are provided with several ventilation holes with a diameter of 1-2mm. The ventilation holes are evenly distributed around the circumference of the protective cover (702).

6. The flame-retardant and radiation-proof wood-plastic composite door panel according to claim 1, characterized in that: The positioning mechanism (9) includes a mounting groove (901), a positioning block (902), and a third spring (903); The mounting groove (901) is opened at the top of the insert (3), and a positioning insert (902) is vertically slidably arranged inside the mounting groove (901). A third spring (903) is provided between the bottom end of the positioning block (902) and the inner bottom of the mounting groove (901). The positioning block (902) has an arc-shaped bevel at the end away from the third spring (903), and the positioning block (902) extends out of the mounting groove (901) in its natural state.

7. The flame-retardant and radiation-proof wood-plastic composite door panel according to claim 1, characterized in that: The composite door panel body (1) has 4-6 ribs spaced along the height direction. The ribs have a rectangular cross-section and the thickness of the ribs is 1 / 3-1 / 2 of the thickness of the composite door panel body (1). The ribs are integrally formed with the composite door panel body (1).

8. The flame-retardant and radiation-proof wood-plastic composite door panel according to claim 1, characterized in that: The sealing strip (4) is a blend of flame-retardant PVC and conductive carbon black. The sealing strip (4) is L-shaped and the outer side of the sealing strip (4) is flush with the surface of the composite door panel body (1).

9. A flame-retardant and radiation-proof wood-plastic composite door panel according to claim 2, characterized in that: The strip plate (502) and the sealing strip (4) are integrally formed, and the inner wall of the strip groove (501) is provided with a graphite lubricating layer.

10. A method for preparing a flame-retardant and radiation-proof wood-plastic composite door panel, based on the flame-retardant and radiation-proof wood-plastic composite door panel according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Raw material pretreatment and mixing: Dry the wood fiber to a moisture content of ≤3% and pass it through an 80-120 mesh sieve; crush the thermoplastic plastic into 20-40 mesh particles; weigh out 50-65 parts by weight of wood fiber, 30-40 parts by weight of thermoplastic plastic, 8-12 parts by weight of flame retardant, 3-8 parts by weight of radiation shielding filler, 0.3-0.5 parts by weight of coupling agent, and 1-2 parts by weight of lubricant, put them into a high-speed mixer, and stir at 100-120℃ for 15-20 minutes to obtain a premix. Step 2: Molding of the composite door panel body (1): The premixed material is fed into a twin-screw extruder and melt-blended and extruded into a blank at 160-200℃ and screw speed of 30-50r / min. The blank is fed into a mold and molded at 20-25MPa pressure and 170-190℃. After cooling to below 60℃, it is demolded to obtain a composite door panel body (1) with 4-6 rectangular ribs integrally formed. Then, a slot (2) is opened at the bottom end of the composite door panel body (1). Step 3: Assembly of the movable connecting mechanism (5): A strip groove (501) is opened at the bottom of the insert (3), and a graphite lubricating layer is coated on the inner wall of the strip groove (501); after the strip plate (502) and the sealing strip (4) are integrally formed, they are slidably embedded into the strip groove (501); a slide rod (503) is fixed at the top of the strip plate (502), and a first spring (506) is sleeved on the outside of the slide rod (503) and then inserted into the mounting cavity (504); a limiting block (505) is fixed at the top of the slide rod (503). Step 4: Installation of the ejection mechanism (7) and the fire extinguishing mechanism (8): Fix the bimetallic strip (703) to the top of the cover (702), slide the top rod (701) through the horizontal plate (6) and make the top end fit with the bimetallic strip (703), and fix the cover (702); open the guide groove (801) and the through (802) in the horizontal plate (6), put in the fire extinguishing dry powder canister (804), install the second spring (807) and the partition (806) in the sliding groove (805), make the partition (806) fit with the side of the top rod (701), and finally install the horizontal plate (6) that integrates the ejection mechanism (7) and the fire extinguishing mechanism (8) between the adjacent ribs; Step 5: Assembly of positioning mechanism (9) and fixing of insert (3): A mounting groove (901) is opened at the end of insert (3), and the third spring (903) and positioning block (902) are installed in sequence; insert the insert (3) with the assembled movable connecting mechanism (5) into the slot (2), and guide it into place by the arc-shaped inclined surface of positioning block (902) to fix the insert (3); Step 6: After the insert (3) is fixed, the bottom end of the top rod (701) is aligned with the slide rod (503), and the through-hole (802) is aligned with the spray groove (803) to ensure that the linkage of each mechanism is accurate. After assembly, the flame-retardant and radiation-proof wood-plastic composite door panel is obtained.

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