Door plate research and application device with anti-falling buckle structure

Abstract

The invention discloses a door plank research and application device with an anti-falling buckle structure, in particular to a door leaf frame and an anti-cracking door plank, the door leaf frame comprises a left frame, an upper frame, a right frame and a lower frame which are connected in sequence and define a rectangular frame; each of the upper frame and the lower frame comprises a first bearing part, a first connecting part and a second bearing part; the area of the first bearing part is larger than that of the second bearing part; each of the left frame and the right frame comprises an inclined supporting part, a second connecting part and a stepped bearing part; the orthographic projection distance between the lower bottom face of the first bearing part and the upper bottom face of the second bearing part in the direction from the upper frame to the lower frame is a, the width of the left frame and the right frame in the direction from the left frame to the right frame is b, and a is larger than b. The width of the upper frame and the width of the left frame can be inconsistent, the size of the anti-cracking door plate does not need to be limited, and therefore splicing dislocation among the upper frame, the left frame, the lower frame and the right frame is avoided.

Description

Technical Field

[0001] The present invention relates to the field of furniture technology, and more specifically, to a research and application device for a door panel with an anti-dropping buckle structure. The present invention can also be called a door leaf frame and an anti-cracking door panel. Background Art

[0002] Door panels are one of the most commonly used decorative building materials. They are the entrances and exits of buildings or devices installed at entrances and exits that can be opened and closed.

[0003] In the furniture industry, solid wood door panels are positioned as high-end products due to their natural texture and high-end texture, but the natural characteristics of solid wood (such as shrinkage and swelling, anisotropy) can lead to the following problems: when the moisture content of the wood changes, the internal stress is uneven, resulting in cracks; when the temperature and humidity change, the lateral expansion rate increases; the existing technology uses a 45-degree splicing method to alleviate the problem of solid wood cracking, but each frame uniformly limits the size of the door panel. For example, the width of all frames spliced ​​at a 45-degree angle must be the same, otherwise the splicing seams will be misaligned. If the design is a non-standard size door panel, the frame needs to be customized, which increases the production cost. Therefore, this is a technical problem that urgently needs to be solved in this field.

[0004] Chinese Patent Document 1 (Application No.: 2016204638919, Application Date: 2016.05.21) discloses an anti-cracking door panel structure, comprising a door edge and a pool panel located inside the door edge. The door edge comprises two relatively parallel vertically placed door stiles 2', an upper cap 3' is connected between the upper ends of the two door stiles 2', a lock cap is connected between the middle parts of the two door stiles 2', the two side stiles and the upper cap 3' and the lower cap are surrounded by a pool panel installation space, and the pool panel installation space is divided into an upper installation space and a lower installation space by the lock cap. The installation space, the inner side surfaces of the upper installation space and the lower installation space are respectively provided with inward concave mortise holes, the four edges of the pool board are provided with tenons that cooperate with the mortises to form a plug-in fixation, a long strip of pressing edge is sleeved on the tenon, and a fixing hole that cooperates with the tenon is provided in the middle of the pressing edge. The tenon passes through the fixing hole and cooperates with the mortise, and a bayonet is provided at the corresponding position of the pressing edge and the pool board installation space. The width of the bayonet is equal to the thickness of the door support, upper cover, lock cover and lower cover to form a pressing edge that is buckled on the door support 2', upper cover 3', lock cover and lower cover through the bayonet. The structure of the cover and the lower cover, the door sill 2 'is provided with a jack at the opposite ends of the upper cover 3 ', the lock cover and the lower cover, and the upper cover 3 ', the lock cover and the lower cover opposite to the jack are provided with a plug that is plugged into the jack. The plug includes a large diameter section 12a 'with the same outer diameter as the inner diameter of the jack, the large diameter section 12a 'extending outwardly with a small diameter section 12b ', and a slope section 12c 'is provided at the junction of the small diameter section 12b 'and the large diameter section 12a '. The mortise and the pressure edge bayonet corresponding to the slope section 12c 'of the plug 12 ' A tightening wedge 13' is respectively provided, and the tightening wedge 13' is inserted into the outer frame of the mortise and the socket and is slidably connected. The lower end of the tightening wedge 13' contacts the tenon, and the upper end of the tightening wedge 13' contacts the inner side surface of the bayonet and the socket, and a slope is provided at the contact point between the tenon and the tightening wedge 13', forming a structure in which the tenon is inserted into the mortise and the socket, and the tightening wedge 13' tightens the inner side surface of the bayonet and the socket under the action of the slope. In this solution, the dimensions (such as width) of the door support 2' and the upper cover 3' are still the same, and the above-mentioned technical problems are not solved.

[0005] Chinese patent document 2 (application number: 2017204299401, application date: 2017.04.22) discloses a cabinet door panel, including a door core panel and a door frame arranged around the door core panel, the door frame including long frames arranged on both sides of the door core panel along the length direction of the door core panel and short frames arranged at both ends of the door core panel along the length direction of the door core panel; each of the long frames and short frames is respectively connected to the door core panel through a snap-fit ​​structure; the joints of each adjacent frame are connected through a mortise and tenon structure. In this solution, the widths of the long frame and the short frame are exactly the same, and the above-mentioned technical problem is still not solved. Summary of the Invention

[0006] In view of this, the present invention provides a door leaf frame to solve the problem in the prior art that the widths of all frames spliced ​​at 45-degree angles must be the same, otherwise the splicing seams will be misaligned. If non-standard size door panels are designed, the frames need to be customized, increasing production costs.

[0007] In a first aspect, the present application provides a door frame, comprising a left frame, an upper frame, a right frame, and a lower frame connected in sequence to form a rectangular frame, wherein the left frame is parallel to the right frame, the upper frame is parallel to the lower frame and is axially symmetrically arranged, and the left frame is perpendicular to the upper frame;

[0008] The upper frame and the lower frame each include a first bearing portion, a first connecting portion, and a second bearing portion. The first bearing portion, the first connecting portion, and the second bearing portion in the upper frame are sequentially connected along a direction from the upper frame to the lower frame. The first bearing portion and the second bearing portion in the upper frame are respectively inverted isosceles trapezoids, and the first connecting portion in the upper frame is a rectangular parallelepiped. The first bearing portion, the first connecting portion, and the second bearing portion in the lower frame are sequentially connected along a direction from the lower frame to the upper frame. The first bearing portion and the second bearing portion in the lower frame are respectively isosceles trapezoids, and the first connecting portion in the lower frame is a rectangular parallelepiped.

[0009] The upper bottom surface of the first bearing portion is connected to one side of the first connecting portion, and the lower bottom surface of the second bearing portion is connected to the other side of the first connecting portion; the area of ​​the first bearing portion is larger than that of the second bearing portion;

[0010] The left frame and the right frame each include an oblique supporting portion corresponding to the first bearing portion, a second connecting portion corresponding to the first connecting portion, and a stepped supporting portion corresponding to the second bearing portion on one side near the upper frame and the lower frame. The oblique supporting portion is a right-angled triangular prism, the second connecting portion is a rectangular parallelepiped, and the stepped supporting portion is a right-angled trapezoidal prism. The oblique side surface of the oblique supporting portion in the left frame contacts the left waist side surface of the first bearing portion, and the oblique side surface of the oblique supporting portion in the right frame contacts the right waist side surface of the first bearing portion; the right side surface of the second connecting portion in the left frame and the left side surface of the first connecting portion, the right side surface of the second connecting portion in the left frame and the right side surface of the first connecting portion, the oblique side surface of the stepped supporting portion in the left frame and the left waist side surface of the second bearing portion, and the oblique side surface of the stepped supporting portion in the right frame and the right waist side surface of the second bearing portion are respectively connected by snap fasteners;

[0011] The orthographic projection distance between the lower bottom surface of the first supporting portion and the upper bottom surface of the second supporting portion along the direction from the upper frame to the lower frame is a, and the width of the left frame and the right frame along the direction from the left frame to the right frame is b, a>b.

[0012] Optionally, along the direction from the left frame to the right frame, the extended plane of the left waist side surface of the first supporting portion intersects with the extended plane of the left side surface of the first connecting portion to form a first obtuse angle, and the opening of the first obtuse angle faces the left frame; the extended plane of the right waist side surface of the first supporting portion intersects with the extended plane of the right side surface of the first connecting portion to form a second obtuse angle, and the opening of the second obtuse angle faces the right frame; the extended plane of the left waist side surface of the second supporting portion intersects with the extended plane of the left side surface of the first connecting portion to form a third obtuse angle, and the opening of the first obtuse angle faces the right frame; the extended plane of the right waist side surface of the second supporting portion intersects with the extended plane of the right side surface of the first connecting portion to form a fourth obtuse angle, and the opening of the fourth obtuse angle faces the left frame;

[0013] Along the direction from the upper frame to the lower frame, the extension plane of the oblique side surface of the oblique supporting portion in the left frame intersects with the extension plane of the right side surface of the second connecting portion in the left frame, forming a fifth obtuse angle matching the first obtuse angle, and the first obtuse angle contacts the fifth obtuse angle. The extension plane of the oblique side surface of the oblique supporting portion in the right frame intersects with the extension plane of the left side surface of the second connecting portion in the right frame, forming a sixth obtuse angle matching the second obtuse angle, and the second obtuse angle contacts the sixth obtuse angle; the extension plane of the oblique side surface of the step supporting portion in the left frame intersects with the extension plane of the right side surface of the second connecting portion in the left frame, forming a seventh obtuse angle matching the third obtuse angle, and the third obtuse angle contacts the seventh obtuse angle. The extension plane of the oblique side surface of the step supporting portion in the right frame intersects with the extension plane of the left side surface of the second connecting portion in the right frame, forming an eighth obtuse angle matching the fourth obtuse angle, and the fourth obtuse angle contacts the eighth obtuse angle.

[0014] Optionally, a first card slot is formed on a side of the second connecting portion close to the first connecting portion, the first card slot is recessed toward a side away from the first connecting portion, a second card slot is formed on a side of the stepped receiving portion close to the second bearing portion, the second card slot is recessed toward a side away from the second bearing portion, and a length extension direction of the second card slot intersects a length extension direction of the first card slot;

[0015] A third card slot communicating with the first card slot is formed on a side of the first connecting portion close to the second connecting portion, the third card slot being recessed away from the second connecting portion; a fourth card slot communicating with the second card slot is formed on a side of the second supporting portion close to the stepped supporting portion, the fourth card slot being recessed away from the stepped supporting portion;

[0016] The fastener includes a first fastener strip and a second fastener strip, each of which is a cylindrical structure. The first fastener strip is plugged into the first card slot and the third card slot, and the second fastener strip is plugged into the second card slot and the fourth card slot.

[0017] Optionally, the first connecting portion is at right angles to the length extension direction of the third card slot on both sides along the direction from the left frame to the right frame, and the second connecting portion is at right angles to the length extension direction of the first card slot on one side close to the first connecting portion.

[0018] Optionally, the left frame, the upper frame, the right frame, the lower frame, the first snap-fit ​​strip and / or the second snap-fit ​​strip are made of wood.

[0019] Optionally, the upper bottom surface of the first bearing part and the lower bottom surface of the second bearing part are respectively equal to the long side surface of the first connecting part, or the upper bottom surface of the first bearing part is equal to the long side surface of the first connecting part, and the long side surface of the first connecting part is larger than the lower bottom surface of the second bearing part.

[0020] Optionally, the left frame and the right frame further include a third connecting portion, which is a rectangular parallelepiped. The third connecting portion in the left frame is located between the two step supporting portions in the left frame, and the third connecting portion in the right frame is located between the two step supporting portions in the right frame.

[0021] Optionally, the width ratio between a and b ranges from 0.25 to 0.75.

[0022] In a second aspect, the present application provides a crack-resistant door panel, comprising a door leaf frame and a door core, wherein the door leaf frame is the above-mentioned door leaf frame, and the door core is embedded in a rectangular frame surrounded by a left frame, an upper frame, a right frame and a lower frame.

[0023] Compared with the prior art, the door leaf frame provided by the present invention achieves at least the following beneficial effects:

[0024] First, in the present invention, the dimensions (such as width) of the upper and lower frames do not need to be completely consistent with the dimensions (such as width) of the left and right frames, that is, the width of the upper frame can be consistent with the width of the lower frame, and the width of the left frame can be consistent with the width of the right frame, but the width of the upper frame can be inconsistent with the width of the left frame. Since the width of the upper frame can be inconsistent with the width of the left frame, there is no need to limit the size of the anti-cracking door panel, thereby avoiding splicing misalignment between the upper frame, left frame, lower frame and right frame; if the upper frame, left frame, lower frame and right frame are designed as non-standard door leaf frames, there is no need to re-customize the upper frame, lower frame, left frame and right frame, thereby reducing costs;

[0025] Second, through the mutual coordination between the first load-bearing portion and the oblique supporting portion, between the first connecting portion and the second connecting portion, and between the second load-bearing portion and the stepped receiving portion, stress can be released in stages, thereby significantly reducing the cracking rate of the door frame and improving structural stability.

[0026] Third, since the first load-bearing portion and the second load-bearing portion in the upper frame are respectively inverted isosceles trapezoids, the first connecting portion in the upper frame is a rectangular parallelepiped, the first load-bearing portion and the second load-bearing portion in the lower frame are respectively isosceles trapezoids, the first connecting portion in the lower frame is a rectangular parallelepiped, the oblique supporting portion is a right-angled triangular prism, the second connecting portion is a rectangular parallelepiped, and the stepped receiving portion is a right-angled trapezoidal prism, a self-positioning effect is formed by the oblique side surface of the oblique supporting portion contacting the waist side surface of the first load-bearing portion, and position deviation is automatically corrected during installation (an initial error of ±1.5mm is allowed); the first connecting portion and the second connecting portion, as well as the second load-bearing portion and the stepped receiving portion connected by the snap fastener provide a rigid reference surface to ensure the flatness of the door frame, thereby improving assembly efficiency and allowing assembly to be completed without the need for specialized tools;

[0027] When the door frame is subjected to an external impact, the waist-side structures of the first and second load-bearing parts work together to form a two-stage energy absorption system. The first load-bearing part (large waist side) takes the lead in plastic energy absorption, converting 60% of the impact energy into material deformation work. The second load-bearing part (small waist side) dissipates residual energy through elastic recovery. Combined with the geometric constraints of the stepped support part, the peak impact force is reduced by 58%. This design has been tested for durability over 10,000 times and its impact resistance meets the highest level requirements of GB / T 8478-2020.

[0028] Fourth, it can not only strengthen the vertical rigidity to improve the bending resistance, but also compact the horizontal layout to save installation space.

[0029] Of course, any product implementing the present invention does not necessarily need to achieve all of the above technical effects at the same time.

[0030] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1 This is the corresponding solution provided by Chinese Patent Document 1 Figure 3 An enlarged schematic diagram of part B;

[0033] Figure 2 This is a structural schematic diagram of a door leaf frame provided by the present invention;

[0034] Figure 3 This is an exploded view of a door leaf frame provided by the present invention;

[0035] Figure 4 This is a structural diagram of a portion of a left border, an upper border, and a portion of a right border provided by the present invention;

[0036] Figure 5 This is a structural diagram of a portion of a left border, a bottom border, and a portion of a right border provided by the present invention;

[0037] Figure 6 This is a structural diagram of an upper frame provided by the present invention;

[0038] Figure 7 This is a structural diagram of a lower frame provided by the present invention;

[0039] Figure 8 This is a structural diagram of a left frame provided by the present invention;

[0040] Figure 9 This is a structural diagram of a right frame provided by the present invention;

[0041] Figure 10 This is a structural schematic diagram of another door leaf frame provided by the present invention. DETAILED DESCRIPTION

[0042] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0043] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0044] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0045] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0046] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0047] Example 1

[0048] Reference Figure 1-Figure 5 As shown, Figure 1 The corresponding solution provided by Chinese Patent Document 1 is Figure 3 An enlarged schematic diagram of part B; Figure 2 This is a structural schematic diagram of a door leaf frame provided by the present invention;

[0049] Figure 3 This is an exploded view of a door leaf frame provided by the present invention; Figure 4 This is a structural diagram of a portion of a left border, an upper border, and a portion of a right border provided by the present invention; Figure 5 This is a schematic diagram of a structure of a portion of a left frame, a lower frame, and a portion of a right frame provided by the present invention. This embodiment provides a door frame 1, comprising a left frame 11, an upper frame 12, a right frame 13, and a lower frame 14 connected in sequence to form a rectangular frame. The left frame 11 is parallel to the right frame 13 and is arranged symmetrically about the axis. The upper frame 12 is parallel to the lower frame 14, and the left frame 11 is perpendicular to the upper frame 12.

[0050] The upper frame 12 and the lower frame 14 both include a first bearing portion 121, a first connecting portion 122, and a second bearing portion 123. The first bearing portion 121, the first connecting portion 122, and the second bearing portion 123 in the upper frame 12 are sequentially connected along a direction Y from the upper frame 12 to the lower frame 14. The first bearing portion 121 and the second bearing portion 123 in the upper frame 12 are respectively inverted isosceles trapezoids, and the first connecting portion 122 in the upper frame 12 is a rectangular parallelepiped. The first bearing portion 121, the first connecting portion 122, and the second bearing portion 123 in the lower frame 14 are sequentially connected along a direction from the lower frame 14 to the upper frame 12. The first bearing portion 121 and the second bearing portion 123 in the lower frame 14 are respectively isosceles trapezoids, and the first connecting portion 122 in the lower frame 14 is a rectangular parallelepiped.

[0051] The upper bottom surface of the first supporting portion 121 is connected to one side of the first connecting portion 122, and the lower bottom surface of the second supporting portion 123 is connected to the other side of the first connecting portion 122; the area of ​​the first supporting portion 121 is larger than the area of ​​the second supporting portion 123;

[0052] The left frame 11 and the right frame 13 near the upper frame 12 and the lower frame 14 both include an oblique supporting portion 131 corresponding to the first bearing portion 121, a second connecting portion 132 corresponding to the first connecting portion 122, and a stepped receiving portion 133 corresponding to the second bearing portion 123. The oblique supporting portion 131 is a right-angled triangular prism, the second connecting portion 132 is a rectangular parallelepiped, and the stepped receiving portion 133 is a right-angled trapezoidal prism. The oblique side surface of the oblique supporting portion 131 in the left frame 11 contacts the left waist side surface of the first bearing portion 121, and the oblique side surface of the right frame 13 contacts the left waist side surface of the first bearing portion 121. The oblique side surface of the supporting portion 131 contacts the right waist side surface of the first supporting portion 121; the right side surface of the second connecting portion 132 in the left frame 11 and the left side surface of the first connecting portion 122, the right side surface of the second connecting portion 132 in the left frame 11 and the right side surface of the first connecting portion 122, the oblique side surface of the stepped receiving portion 133 in the left frame 11 and the left waist side surface of the second supporting portion 123, and the oblique side surface of the stepped receiving portion 133 in the right frame 13 and the right waist side surface of the second supporting portion 123 are respectively connected by fasteners 15;

[0053] The orthographic projection distance between the lower bottom surface of the first supporting portion 121 and the upper bottom surface of the second supporting portion 123 along the direction Y pointing from the upper frame 12 to the lower frame 14 is a, and the width of the left frame 11 and the right frame 13 along the direction X pointing from the left frame 11 to the right frame 13 is b, a>b.

[0054] Specifically, combined Figure 2-Figure 5 As shown, this embodiment provides a door frame 1, including a left side frame 11, an upper side frame 12, a right side frame 13 and a lower side frame 14 connected end to end. The left side frame 11, the upper side frame 12, the right side frame 13 and the lower side frame 14 are connected in sequence to form a rectangular frame. The left side frame 11 and the upper side frame 12 are mirror-symmetrically arranged, and the upper side frame 12 and the lower side frame 14 are mirror-symmetrically arranged. The left side frame 11, the upper side frame 12, the right side frame 13 and the lower side frame 14 provide support and stability. The length extension direction of the left side frame 11 is parallel to the length extension direction of the right side frame 13, and the length of the left side frame 11 is equal to the length of the right side frame 13. The length extension direction of the upper side frame 12 is parallel to the length extension direction of the lower side frame 14, and the length of the upper side frame 12 is equal to the length of the lower side frame 14. The length extension direction of the left side frame 11 is perpendicular to the length extension direction of the upper side frame 12.

[0055] The upper frame 12 and the lower frame 14 both include a first bearing portion 121, a first connecting portion 122 and a second bearing portion 123. The first bearing portion 121 and the second bearing portion 123 in the upper frame 12 are respectively inverted isosceles trapezoids, that is, the first bearing portion 121 and the second bearing portion 123 in the upper frame 12 are respectively wide at the top and narrow at the bottom, and the first bearing portion 121 and the second bearing portion 123 in the lower frame 14 are respectively isosceles trapezoids, that is, the first bearing portion 121 and the second bearing portion 123 in the lower frame 14 are respectively narrow at the top and wide at the bottom, and the first connecting portion 122 of the upper frame 12 and the lower frame 14 are both equal-width sections; the first bearing portion 121, the first connecting portion 122 and the second bearing portion 123 in the upper frame 12 are connected in sequence along the direction Y from the upper frame 12 to the lower frame 14, and the first bearing portion 121, the first connecting portion 122 and the second bearing portion 123 in the lower frame 14 are connected in sequence along the direction from the lower frame 14 to the upper frame 12.

[0056] The upper bottom surface of the first supporting portion 121 is located on the side of the lower bottom surface of the first supporting portion 121 close to the first connecting portion 122, and the upper bottom surface of the second supporting portion 123 is located on the side of the lower bottom surface of the second supporting portion 123 away from the first connecting portion 122. For example, the upper bottom surface of the first supporting portion 121 is close to the first connecting portion 122, the lower bottom surface of the first supporting portion 121 is away from the first connecting portion 122, the upper bottom surface of the second supporting portion 123 is away from the first connecting portion 122, and the lower bottom surface of the second supporting portion 123 is close to the first connecting portion 122.

[0057] Because both the upper frame 12 and the lower frame 14 are inverted isosceles trapezoids or a combination of an isosceles trapezoid and a cuboid, the transition between the waist sides of the inverted isosceles trapezoids and the isosceles trapezoids in the first and second supporting portions 121, 123 disperses the stress of conventional right-angle or 45-degree angled splicing, thereby reducing the risk of cracking. The waist sides of the first and second supporting portions 121, 123 provide space for slight deformation, reducing direct compression of the first connecting portion 122.

[0058] Specifically, the upper frame 12 and the lower frame 14 respectively adopt a double isosceles trapezoid design to form a three-pole energy absorption mechanism: first buffering: the waist side of the first bearing part 121 absorbs 60% to 70% of the impact energy through elastic deformation; force flow conduction: the first connecting part 122 evenly distributes the remaining impact force to the entire rectangular frame; secondary decomposition: the second bearing part 123 dissipates residual energy through local plastic deformation and seam displacement. It can be understood as: through the synergistic effect of the waist side structures of the first bearing part 121 and the second bearing part 123, a two-stage energy absorption system is formed. The first bearing part 121 (large waist side) dominates the plastic energy absorption and converts 60% of the impact energy into material deformation work; the second bearing part 123 (small waist side) dissipates the residual energy through elastic recovery, and subsequently cooperates with the geometric constraints of the step receiving part 133 to reduce the impact peak force by 58%. The design has been subjected to tens of thousands of durability tests by the inventor, and its impact resistance meets the requirements of GB / T 8478-2020 is the highest level requirement; that is, it can achieve graded stress release, thereby significantly reducing the cracking rate of the door frame 1 and thereby improving structural stability.

[0059] After tens of thousands of experiments, the inventors concluded that compared with the door leaf and door frame in the prior art, the bending stiffness and impact resistance of the door leaf and door frame are greatly improved. For example, the bending stiffness of the door leaf and door frame 1 is 180% to 220%, and the impact resistance is 250% to 300%.

[0060] The first bearing portion 121 in the upper frame 12 is located on the outside of the first connecting portion 122 (such as away from the center of the rectangular frame), and preferably releases the upward expansion force. The second bearing portion 123 in the upper frame 12 is located on the inside of the first connecting portion 122 (such as close to the center of the rectangular frame), and secondarily releases the upward expansion force. The first bearing portion 121 in the lower frame 14 is located on the outside of the first connecting portion 122 (such as away from the center of the rectangular frame), and preferably releases the downward expansion force. The second bearing portion 123 in the lower frame 14 is located on the inside of the first connecting portion 122 (such as away from the center of the rectangular frame), and secondarily releases the downward expansion force.

[0061] Usually, the main force points of the door leaf frame 1 are concentrated in the area close to the door axis (such as the left frame 11 or the right frame 13). Making the area of ​​the first bearing part 121 larger than the area of ​​the second bearing part 123 can improve the bending resistance and prevent deformation when opening and closing the door. For example, when the door leaf frame is subjected to wind or impact, the impact force will be dispersed to the entire rectangular frame through the waist side of the large isosceles trapezoid, rather than concentrated at the joints.

[0062] An oblique supporting portion 131, a second connecting portion 132, and a stepped receiving portion 133 are respectively provided on the left frame 11 close to the upper frame 12 and the lower frame 14. The waist side surfaces of the first bearing portions 121 of the upper frame 12 and the lower frame 14 match and contact the oblique side surfaces of the oblique supporting portion 131; the first connecting portion 122 and the second connecting portion 132 of the upper frame 12 and the lower frame 14, and the second bearing portions 123 of the upper frame 12 and the lower frame 14 and the waist side surfaces of the stepped receiving portion 133 are respectively connected by fasteners 15.

[0063] A diagonal support portion 131, a second connecting portion 132, and a stepped receiving portion 133 are respectively provided on the side of the right side frame 13 near the upper side frame 12 and the lower side frame 14. The waist side surfaces of the first supporting portion 121 of the upper and lower side frames 12 and 14 mate with the diagonal side surfaces of the diagonal support portion 131. Fasteners 15 connect the first and second connecting portions 122 and 132 of the upper and lower side frames 12 and 14, respectively, and the second supporting portions 123 of the upper and lower side frames 12 and 14 and the waist side surfaces of the stepped receiving portion 133. The diagonal support portion 131 distributes 60% of the impact force to the waist side surfaces of the first supporting portion 121 through the diagonal edge. The second connecting portion 132 directly transmits 30% of the load to the core rectangular area via the fasteners 15. The stepped receiving portion 133 absorbs the remaining 10% of the vibration energy.

[0064] It should be noted that: in the prior art, the adjacent frames in the door leaf and door frame are designed with right angles or 45-degree angles, while in the present application, the first bearing part 121 and the second bearing part 123 in the upper frame 12 are respectively inverted isosceles trapezoids, and the first connecting part 122 in the upper frame 12 is a rectangular parallelepiped; the first bearing part 121 and the second bearing part 123 in the lower frame 14 are respectively isosceles trapezoids, and the first connecting part 122 in the lower frame 14 is a rectangular parallelepiped, the oblique supporting part 131 in the left frame 11 and the right frame 13 is a right-angled triangular prism, the second connecting part 132 is a rectangular parallelepiped, and the stepped supporting part 133 is a right-angled trapezoidal prism, so that the above-mentioned first bearing part 121 is in close contact with the oblique supporting part 131, the first connecting part 122 is in close contact with the second connecting part 132, and the second bearing part 123 is in close contact with the stepped supporting part 133. The above structural features are improvements made by the inventors of this application based on actual work, and are not something that can be seen or thought of by those skilled in the art, that is, they do not belong to common knowledge and conventional technical means in this field.

[0065] The vertical projection distance from the lower bottom surface of the first bearing portion 121 to the upper bottom surface of the second bearing portion 123 is a (such as the vertical distance a), and the total width between the outermost sides of the left frame 11 and the right frame 13 is b (the horizontal width b), wherein a>b; specifically, the first bearing portion 121 and the second bearing portion 123 in the upper frame 12 are inverted isosceles trapezoids, the first bearing portion 121 and the second bearing portion 123 in the lower frame 14 are isosceles trapezoids, and the first connecting portion 122 is a cuboid, a>b, which means that the upper frame 12 and the lower frame 14 are respectively connected to the left The joint surface between the frame 11 and the right frame 13 is longer, which increases the fixing area of ​​the fastener and disperses the stress at the joint. Any tendency to attempt lateral dislocation will be blocked by the waist side of the first bearing part 121 and the second bearing part 123, forming a physical limit; at the same time, it can more effectively resist this torsion and avoid the joint seam from being dislocated due to deformation. In addition, the load of the door frame (such as external force) can be more evenly transferred to the left and right frames through the waist side of the first bearing part 121 and the second bearing part 123, reducing the cracking of the joint caused by local stress.

[0066] Optionally, the first bearing part 121, the first connecting part 122 and the second bearing part 123 can be an integrated structure. Using an integrated structure for the first bearing part 121, the first connecting part 122 and the second bearing part 123 can not only avoid the weak points at the split connections, but also have higher overall rigidity and can better withstand the lateral load, impact or fatigue stress of frequent opening and closing of the door leaf frame 1, but also completely eliminate the seams, improve the waterproof, dustproof and sound insulation performance of the door leaf frame 1, and at the same time eliminate the steps of welding, riveting or bolting, thereby simplifying the production process and reducing labor and time costs.

[0067] The first bearing part 121 and the second bearing part 123 of the inverted isosceles trapezoid in the upper frame 12 are seamlessly connected with the first connecting part 122 of the rectangular parallelepiped, and the first bearing part 121 and the second bearing part 123 of the isosceles trapezoid in the lower frame 14 are seamlessly connected with the first connecting part 122 of the rectangular parallelepiped, so the force transmission is smoother and the risk of local deformation is reduced.

[0068] The oblique support portion 131, the second connecting portion 132, and the stepped receiving portion 133 are an integrated structure. The oblique support portion, the second connecting portion, and the stepped receiving portion are seamlessly connected, forming a continuous mechanical transmission path, avoiding the stress concentration problem of a separate structure. Furthermore, the geometric transition between the oblique support portion 131 and the stepped receiving portion 133 is smoother, dispersing localized pressure while ensuring strict matching of angles and dimensions, thus avoiding misalignment or gaps caused by separate assembly. Furthermore, the welding, riveting, or bolting steps of the oblique support portion 131, the second connecting portion 132, and the stepped receiving portion 133 are eliminated, reducing labor and time costs.

[0069] Compared with the prior art, the door leaf frame 1 provided in this embodiment achieves at least the following beneficial effects:

[0070] (1) In this embodiment, the dimensions (such as width) of the upper frame 12 and the lower frame 14 do not need to be completely consistent with the dimensions (such as width) of the left frame 11 and the right frame 13, that is, the width of the upper frame 12 can be consistent with the width of the lower frame 14, and the width of the left frame 11 can be consistent with the width of the right frame 13, but the width of the upper frame 12 can be inconsistent with the width of the left frame 11. Since the width of the upper frame 12 can be inconsistent with the width of the left frame 11, there is no need to limit the size of the anti-cracking door panel, thereby avoiding splicing misalignment between the upper frame 12, the left frame 11, the lower frame 14 and the right frame 13; if the upper frame 12, the left frame 11, the lower frame 14 and the right frame 13 are designed as non-standard door leaf frames 1, there is no need to re-customize the upper frame 12, the lower frame 14, the left frame 11 and the right frame 13, thereby reducing costs;

[0071] (2) Through the mutual cooperation between the first bearing portion 121 and the oblique supporting portion 131, between the first connecting portion 122 and the second connecting portion 132, and between the second bearing portion 123 and the stepped receiving portion 133, stress can be released in a graded manner, thereby significantly reducing the cracking rate of the door frame 1 and improving the structural stability;

[0072] (3) Since the first bearing portion 121 and the second bearing portion 123 in the upper frame 12 are respectively inverted isosceles trapezoids, the first connecting portion 122 in the upper frame 12 is a rectangular parallelepiped, the first bearing portion 121 and the second bearing portion 123 in the lower frame 14 are respectively isosceles trapezoids, the first connecting portion 122 in the lower frame 14 is a rectangular parallelepiped, the oblique supporting portion 131 is a right triangular prism, the second connecting portion 132 is a rectangular parallelepiped, and the stepped receiving portion 133 is a right trapezoidal prism, a self-positioning effect is formed by the oblique side surface of the oblique supporting portion 131 contacting the waist side surface of the first bearing portion 121, and the position deviation is automatically corrected during installation (an initial error of ±1.5mm is allowed); the first connecting portion 122 and the second connecting portion 132 connected by the snap fastener 15, as well as the second bearing portion 123 and the stepped receiving portion 133 provide a rigid reference surface to ensure the flatness of the door leaf frame 1, thereby improving assembly efficiency and completing assembly without the need for professional tools;

[0073] When the door frame 1 is subjected to an external impact, the waist-side structures of the first load-bearing portion 121 and the second load-bearing portion 123 work together to form a two-stage energy absorption system. The first load-bearing portion 121 (large waist side) takes the lead in plastic energy absorption, converting 60% of the impact energy into material deformation work; the second load-bearing portion 123 (small waist side) dissipates residual energy through elastic recovery. Combined with the geometric constraints of the stepped receiving portion 133, the peak impact force is reduced by 58%. This design has been subjected to tens of thousands of durability tests by the inventors, and its impact resistance meets the highest level requirements of GB / T 8478-2020.

[0074] (4) It not only strengthens the vertical stiffness to improve the bending resistance, but also has a compact horizontal layout to save installation space.

[0075] In an alternative embodiment, combining Figure 3 、 Figure 6-Figure 9 As shown, Figure 6 This is a structural diagram of an upper frame provided by the present invention; Figure 7 This is a structural diagram of a lower frame provided by the present invention; Figure 8 This is a structural diagram of a left frame provided by the present invention; Figure 9 13 is a schematic structural diagram of a right frame provided by the present invention; along the direction X pointing from the left frame 11 to the right frame 13, the extended plane of the left waist side surface of the first supporting portion 121 intersects with the extended plane of the left side surface of the first connecting portion 122 to form a first obtuse angle α1, and the opening of the first obtuse angle α1 faces the left frame 11; the extended plane of the right waist side surface of the first supporting portion 121 intersects with the extended plane of the right side surface of the first connecting portion 122 to form a second obtuse angle α2, and the opening of the second obtuse angle α2 faces the right frame 13; the extended plane of the left waist side surface of the second supporting portion 123 intersects with the extended plane of the left side surface of the first connecting portion 122 to form a third obtuse angle α3, and the opening of the first obtuse angle α1 faces the right frame 13; the extended plane of the right waist side surface of the second supporting portion 123 intersects with the extended plane of the right side surface of the first connecting portion 122 to form a fourth obtuse angle α4, and the opening of the fourth obtuse angle α4 faces the left frame 11;

[0076] Along the direction Y from the upper frame 12 to the lower frame 14, the extension plane of the oblique side surface of the oblique support portion 131 in the left frame 11 intersects with the extension plane of the right side surface of the second connecting portion 132 in the left frame 11, forming a fifth obtuse angle α5 that matches the first obtuse angle α1, and the first obtuse angle α1 contacts the fifth obtuse angle α5. The extension plane of the oblique side surface of the oblique support portion 131 in the right frame 13 intersects with the extension plane of the left side surface of the second connecting portion 132 in the right frame 13, forming a sixth obtuse angle α6 that matches the second obtuse angle α2. The second obtuse angle α2 is in contact with the fifth obtuse angle α5. The sixth obtuse angle α6 is in contact; the extension plane of the oblique side surface of the step receiving portion 133 in the left frame 11 intersects with the extension plane of the right side surface of the second connecting portion 132 in the left frame 11, forming a seventh obtuse angle α7 that matches the third obtuse angle α3, and the third obtuse angle α3 contacts the seventh obtuse angle α7. The extension plane of the oblique side surface of the step receiving portion 133 in the right frame 13 intersects with the extension plane of the left side surface of the second connecting portion 132 in the right frame 13, forming an eighth obtuse angle α8 that matches the fourth obtuse angle α4, and the fourth obtuse angle α4 contacts the eighth obtuse angle α8.

[0077] The left waist side surface of the above-mentioned first bearing portion 121 is in close contact with the oblique side surface of the oblique supporting portion 131 in the left frame 11. After the first connecting portion 122 and the second connecting portion 132 in the left frame 11 are clamped together by the snap fastener 15, the left side surface of the first connecting portion 122 is in close contact with the right side surface of the second connecting portion 132 in the left frame 11; after the second bearing portion 123 is clamped together with the stepped receiving portion 133 in the left frame 11 by the snap fastener 15, the left waist side surface of the second bearing portion 123 is in close contact with the oblique side surface of the stepped receiving portion 133 in the left frame 11; the right waist side surface of the first bearing portion 121 is in close contact with the oblique side surface of the oblique supporting portion 131 in the right frame 13, and the snap fastener 15 is After the first connecting portion 122 and the second connecting portion 132 in the right frame 13 are snapped together, the right side surface of the first connecting portion 122 is in close contact with the left side surface of the second connecting portion 132 in the right frame 13. After the second supporting portion 123 is snapped together with the stepped receiving portion 133 in the right frame 13 by the snap fastener 15, the right waist side surface of the second supporting portion 123 is in close contact with the oblique side surface of the stepped receiving portion 133 in the right frame 13. The vertices of the first obtuse angle α1, the second obtuse angle α2, the fifth obtuse angle α5, and the sixth obtuse angle α6 are located on the same horizontal line, and the vertices of the third obtuse angle α3, the fourth obtuse angle α4, the seventh obtuse angle α7, and the eighth obtuse angle α8 are all located on the same horizontal line.

[0078] The above solution can not only effectively resist lateral and longitudinal forces (such as the impact of opening and closing the door, wind pressure, etc.), but also increase the force-bearing area, disperse the pressure, avoid deformation caused by local stress concentration, and ensure the alignment of the rectangular frame to reduce installation errors. In addition, it can also reduce gaps and improve the sound insulation, dustproofness, waterproofness and aesthetics of the door leaf (such as ensuring the symmetry and visual smoothness of the rectangular frame). The left frame 11 and the upper frame 12, the upper frame 12 and the right frame 13, the left frame 11 and the lower frame 14, and the right frame 13 and the lower frame 14 are hidden by the fasteners 15 to avoid exposing the fasteners 15, and the appearance is simpler.

[0079] Optionally, the first obtuse angle α1 is the same as the second obtuse angle α2, the third obtuse angle α3 is the same as the fourth obtuse angle α4, the fifth obtuse angle α5 is the same as the sixth obtuse angle α6, and the seventh obtuse angle α7 is the same as the eighth obtuse angle α8, wherein the angles of the first obtuse angle α1, the third obtuse angle α3, the fifth obtuse angle α5 and the seventh obtuse angle α7 are 135° respectively. By adopting this scheme, not only can the force on the door panel in the vertical direction be effectively dispersed, stress concentration can be reduced, and cracking or deformation can be avoided, but also a smooth force transfer path can be formed, the load can be evenly transmitted from the frame to the center of the door panel, and the overall bending resistance can be enhanced.

[0080] In an optional embodiment, a first slot 1321 is defined on a side of the second connecting portion 132 close to the first connecting portion 122, and the first slot 1321 is recessed away from the first connecting portion 122. A second slot 1331 is defined on a side of the stepped receiving portion 133 close to the second supporting portion 123, and the second slot 1331 is recessed away from the second supporting portion 123. The length extension direction of the second slot 1331 intersects the length extension direction of the first slot 1321.

[0081] A third engaging slot 1221 is defined on a side of the first connecting portion 122 close to the second connecting portion 132 and communicates with the first engaging slot 1321. The third engaging slot 1221 is recessed away from the second connecting portion 132. A fourth engaging slot 1231 is defined on a side of the second carrying portion 123 close to the stepped receiving portion 133 and communicates with the second engaging slot 1331. The fourth engaging slot 1231 is recessed away from the stepped receiving portion 133.

[0082] The fastener 15 includes a first fastener strip 151 and a second fastener strip 152. The first fastener strip 151 and the second fastener strip 152 are cylindrical structures respectively. The first fastener strip 151 is inserted into the first slot 1321 and the third slot 1221, and the second fastener strip 152 is inserted into the second slot 1331 and the fourth slot 1231.

[0083] Specifically, the first latching slot 1321 of the left frame 11 is located on the end surface of the second connecting portion 132 of the left frame 11 adjacent to the first connecting portion 122. The first latching slot 1321 of the left frame 11 is recessed inward along the direction Y from the right frame 13 toward the left frame 11. The first latching slot 1321 of the right frame 13 is located on the end surface of the second connecting portion 132 of the right frame 13 adjacent to the first connecting portion 122. The first latching slot 1321 of the right frame 13 is recessed inward along the direction X from the left frame 11 toward the right frame 13. The first and third latching slots 1321, 1221, respectively mate with the first snap bar 151 and are both circular holes. The second and fourth latching slots 1331, 1231, respectively mate with the second snap bar 152 and are both circular holes.

[0084] The second card slot 1331 of the left frame 11 is located at the end surface of the stepped receiving portion 133 in the left frame 11 adjacent to the second supporting portion 123, and is recessed inwardly along the direction Y of the right frame 13 pointing to the left frame 11, and the length extension direction of the first card slot 1321 of the left frame 11 intersects with the length extension direction of the second card slot 1331 of the left frame 11 but is not connected; the second card slot 1331 of the right frame 13 is located at the end surface of the stepped receiving portion 133 in the right frame 13 adjacent to the second supporting portion 123, and is recessed inwardly along the direction Y of the right frame 13 pointing to the left frame 11, and the length extension direction of the first card slot 1321 of the right frame 13 intersects with the length extension direction of the second card slot 1331 of the right frame 13 but is not connected.

[0085] Along the direction from the left side frame 11 to the right side frame 13, third slots 1221 are respectively defined on both end surfaces of the first connecting portion 122 corresponding to the first slot 1321 of the left side frame 11 and the first slot 1321 of the right side frame 13. The two third slots 1221 correspond to and match the first slot 1321 of the left side frame 11 and the first slot 1321 of the right side frame 13, respectively. There are two first snap fastener strips 151, one first snap fastener strip 151 is inserted into the first slot 1321 of the left side frame 11 and the third snap fastener strip 1221 of the first connecting portion 122 corresponding to the first slot 1321 of the left side frame 11, and the other first snap fastener strip 151 is inserted into the first slot 1321 of the right side frame 13 and the third snap fastener strip 1221 of the first connecting portion 122 corresponding to the first slot 1321 of the right side frame 13.

[0086] Along the direction from the left side frame 11 to the right side frame 13, the second supporting portion 123 defines fourth slots 1231 on both end surfaces corresponding to the second slots 1331 of the left side frame 11 and the second slots 1331 of the right side frame 13. These fourth slots 1231 correspond to and match the second slots 1331 of the left side frame 11 and the second slots 1331 of the right side frame 13, respectively. There are two second snap fasteners 152: one second snap fastener 152 is inserted into the second slot 1331 of the left side frame 11 and the fourth slot 1231 of the second supporting portion 123 corresponding to the second slot 1331 of the left side frame 11. The other first snap fastener 151 is inserted into the second slot 1331 of the right side frame 13 and the fourth slot 1231 of the second supporting portion 123 corresponding to the second slot 1331 of the right side frame 13. The length of the third slot 1221 of the first connecting portion 122 intersects with, but is not connected to, the length of the fourth slot 1231 of the second supporting portion 123.

[0087] The above-mentioned first slot 1321, second slot 1331, third slot 1221 and fourth slot 1231 can be cylindrical slots or prismatic slots. When the first slot 1321, second slot 1331, third slot 1221 and fourth slot 1231 are cylindrical slots, the stress characteristics are axially symmetrical and uniform load bearing, and the fatigue life under axial load is ≥500,000 times; when the first slot 1321, second slot 1331, third slot 1221 and fourth slot 1231 are prismatic slots, the stress characteristics are multi-faceted distributed load, the facet meshing produces a self-locking effect, and the service life is long (such as a life of ≥800,000 times under multi-axis alternating load). The first snap-in strip 151 is inserted into the first and third slots 1321 and 1221 by interference fit, and the second snap-in strip 152 is inserted into the second and fourth slots 1331 and 1231 by interference fit, forming a four-point positioning constraint system.

[0088] During specific assembly, first, the first snap bar 151 between the upper frame 12, the lower frame 14, and the right frame 13 is inserted into the first slot 1321 and the third slot 1221, and the second snap bar 152 is inserted into the second slot 1331 and the fourth slot 1231. The first snap bar 151 and the second snap bar 152 between the upper frame 12, the lower frame 14, and the right frame 13 need to be inserted simultaneously. Second, the first snap bar 151 between the upper frame 12, the lower frame 14, and the left frame 11 is inserted into the first slot 1321 and the third slot 1221, and the second snap bar 152 is inserted into the second slot 1331 and the fourth slot 1231. The first snap bar 151 and the second snap bar 152 between the upper frame 12, the lower frame 14, and the left frame 11 need to be inserted simultaneously. The above steps can be adjusted and are not specifically limited in this embodiment.

[0089] By adopting the above scheme, the first snap-in strip 151 and the second snap-in strip 152 can be replaced independently; through the mutual coordination between the first snap-in slot 1321, the third snap-in slot 1221 and the first snap-in strip 151, and between the second snap-in slot 1331, the fourth snap-in slot 1231 and the second snap-in strip 152, not only can the load be transferred from the upper frame 12 and the lower frame 14 to the left frame 11 and the right frame 13, thereby achieving a two-way balanced load transfer, but also the assembly time of the rectangular frame is shortened, while reducing maintenance man-hours.

[0090] It should be noted that: the length extension direction of the first snap strip 151 between the left frame 11 and the upper frame 12 and the length extension direction of the second snap strip 152 respectively form a triangular structure with the left frame 11, and the length extension direction of the first snap strip 151 between the left frame 11 and the lower frame 14 respectively form a triangular structure with the left frame 11; the length extension direction of the first snap strip 151 between the right frame 13 and the upper frame 12 and the length extension direction of the second snap strip 152 respectively form a triangular structure with the right frame 13, and the length extension direction of the first snap strip 151 between the right frame 13 and the lower frame 14 respectively form a triangular structure with the right frame 13, so that the structure between the upper frame 12, the left frame 11, the lower frame 14 and the right frame 13 is more stable.

[0091] In addition, in order to increase the stability of the door frame, the upper frame 12 and the lower frame 14 are connected between the side close to the left frame 11 and the left frame 11, and the upper frame 12 and the lower frame 14 are connected between the side close to the right frame 13 and the right frame 13 respectively through the first snap strip 151 and the second snap strip 152, and glue is applied between the first card slot 1321, the third card slot 1221 and the first snap strip 151, and between the second card slot 1331, the fourth card slot 1231 and the second snap strip 152, so as to more effectively and firmly connect the upper frame 12, the left frame 11, the lower frame 14 and the right frame 13.

[0092] Optionally, the first connecting portion 122 is at right angles to the length extension direction of the third card slot 1221 on both sides along the left frame 11 pointing to the right frame 13, and the second connecting portion 132 is at right angles to the length extension direction of the first card slot 1321 on the side close to the first connecting portion 122. The above scheme can ensure that the first buckle strip 151 is strictly inserted into the first card slot 1321 and the third card slot 1221 in a horizontal direction during assembly, avoiding misalignment caused by oblique installation.

[0093] In an alternative embodiment, continue to refer to Figure 3-Figure 5As shown, the left frame 11 and the right frame 13 also include a third connecting portion 134, which is a rectangular parallelepiped. The third connecting portion 134 in the left frame 11 is located between the two stepped supporting portions 133 in the left frame 11, and the third connecting portion 134 in the right frame 13 is located between the two stepped supporting portions 133 in the right frame 13. Specifically, there are two third connecting parts 134, one third connecting part 134 is used to connect the step supporting part 133 in the left frame 11 close to the upper frame 12 and the step supporting part 133 in the left frame 11 close to the lower frame 14, and the other third connecting part 134 is used to connect the step supporting part 133 in the right frame 13 close to the upper frame 12 and the step supporting part 133 in the right frame 13 close to the lower frame 14. With the above scheme, the oblique load of the step supporting part 133 is converted into vertical / horizontal force through the third connecting part 134, and is evenly transmitted to the rectangular frame, thereby eliminating the sharp corner stress at the joint of the step supporting part 133.

[0094] The inventors found that if the left and right frames are too narrow, the edge support will be weakened, causing deformation and cracking during use, while affecting the visual sense of thickness. If the upper and lower frames are too wide, the material cost and processing difficulty will increase, and higher requirements will be placed on the wood processing technology.

[0095] Based on the above issues, the width ratio between a and b ranges from 0.25 to 0.75. This not only improves the support of the anti-crack door panel edge, preventing deformation and cracking during use, and enhancing the visual sense of heaviness, but also reduces material costs, manufacturing costs, and processing difficulty. Specifically, the width of the third connecting portion 134 of the left and right side frames 11 and 13 along the direction from the left side frame 11 to the right side frame 13 is b.

[0096] Optionally, the length of the second card slot 1331 of the left frame 11 extends toward the third connection portion 134 of the left frame 11, the length of the second card slot 1331 of the right frame 13 extends toward the third connection portion 134 of the right frame 13, and the length of the fourth card slot 1231 extends toward the side of the first connection portion 122. The fourth card slot 1231 is not connected to the third card slot 1221, which more effectively improves the stability of the insertion of the second buckle strip 152.

[0097] Optionally, the material of the left frame 11, the upper frame 12, the right frame 13, the lower frame 14 and / or the first snap strip 151 and the second snap strip 152 includes wood, that is, the left frame 11, the upper frame 12, the right frame 13, the lower frame 14 and the snap connector 15 are respectively made of wood, and the wood can be solid wood, which has the characteristics of natural wood grain, good workability, sound insulation and heat insulation.

[0098] Optionally, combined Figure 2 and Figure 10 As shown, Figure 10It is a structural schematic diagram of another door leaf frame provided by the present invention; the upper bottom surface of the first bearing part 121 and the lower bottom surface of the second bearing part 123 are respectively equal to the long side surface of the first connecting part 122, or the upper bottom surface of the first bearing part 121 is equal to the long side surface of the first connecting part 122, and the long side surface of the first connecting part 121 is larger than the lower bottom surface of the second bearing part 123.

[0099] Specifically, refer to Figure 2 As shown, along the direction from the left frame 11 to the right frame 13, the length of the upper bottom surface of the first bearing portion 121 and the length of the lower bottom surface of the second bearing portion 123 are respectively equal to the length of the rectangular surface corresponding to the long side of the first connecting portion 122, that is, the length of the upper bottom surface of the first bearing portion 121 = the length of the lower bottom surface of the second bearing portion 123 = the length of the rectangular surface corresponding to the long side of the first connecting portion 122, ensuring seamless alignment during splicing to avoid stress concentration.

[0100] Continue to refer to Figure 10 As shown, along the direction from the left frame 11 to the right frame 13, the length of the upper bottom surface of the first bearing portion 121 is equal to the length of the rectangular surface corresponding to the long side of the first connecting portion 122, and the length of the lower bottom surface of the second bearing portion 123 is less than the length of the rectangular surface corresponding to the long side of the first connecting portion 122, that is, the length of the upper bottom surface of the first bearing portion 121 = the length of the rectangular surface corresponding to the long side of the first connecting portion 122, and the length of the rectangular surface corresponding to the long side of the first connecting portion 122 > the length of the lower bottom surface of the second bearing portion 123, forming a cross-sectional contraction design, so that the force is gradually dispersed to a wider support area (such as an oblique support portion or a stepped receiving portion) during the transmission process, reducing the pressure peak of the second bearing portion and preventing deformation or cracking. The long side surface of the first connecting portion is larger, which is equivalent to increasing the cross-sectional moment of inertia of this part, significantly improving its bending and shear resistance.

[0101] Example 2

[0102] This embodiment provides a crack-resistant door panel, including a door leaf frame 1 and a door core 2. The door leaf frame 1 is the above-mentioned door leaf frame 1, and the door core 2 is embedded in a rectangular frame surrounded by a left frame 11, an upper frame 12, a right frame 13 and a lower frame 14.

[0103] The door frame 1 is a rectangular load-bearing frame consisting of a left side frame 11, a top side frame 12, a right side frame 13, and a bottom side frame 14. It is typically made of hardwood (such as oak) and reinforced with fasteners 15 to form a rigid support system. The door core 2 can be made of solid wood panels, honeycomb cardboard, or medium-density fiberboard. It is embedded in the rectangular frame with a 1-2mm expansion joint to avoid hard contact.

[0104] In Example 1, the door leaf frame 1 adopts a multi-level load-bearing structure, which cooperates with the three-section load-bearing distribution parts of the upper frame 12 and the lower frame 14 (such as the first load-bearing part 121, the first connecting part 122 and the second load-bearing part 123) and the oblique support part 131, the second connecting part 132 and the stepped supporting part 133 of the left frame 11 and the right frame 13 to effectively absorb the bending moment and torque generated when the anti-cracking door panel is hung, thereby reducing the lateral stress and vertical stress of the door core 2, and thus reducing the cracking rate as much as possible.

[0105] It can be seen from the above embodiments that the door leaf frame and the anti-cracking door panel provided by the present invention achieve at least the following beneficial effects:

[0106] (1) In this embodiment, the dimensions (e.g., width) of the upper and lower frames do not need to be completely consistent with the dimensions (e.g., width) of the left and right frames. A non-standard door leaf frame can be designed, thereby eliminating the need to re-customize the upper, lower, left, and right frames, thereby reducing costs.

[0107] The oblique side surface of the oblique support portion contacts the waist side surface of the first load-bearing portion to create a self-positioning effect, automatically correcting position deviations during installation (an initial error of ±1.5mm is allowed). The first and second connecting parts connected by the snap fasteners, as well as the second load-bearing portion and the stepped receiving portion, provide a rigid reference surface to ensure the flatness of the door frame, thereby improving assembly efficiency and allowing assembly without the need for specialized tools.

[0108] (2) Through the mutual coordination between the first bearing portion and the oblique supporting portion, between the first connecting portion and the second connecting portion, and between the second bearing portion and the stepped receiving portion, stress release can be achieved in a graded manner, thereby significantly reducing the cracking rate of the door leaf frame and thereby improving the structural stability;

[0109] (3) When the door frame is subjected to an external impact, the oblique side structures of the first and second load-bearing parts work together to form a two-stage energy absorption system. The first load-bearing part (large oblique side) dominates the plastic energy absorption, converting 60% of the impact energy into material deformation work; the second load-bearing part (small oblique side) dissipates the residual energy through elastic recovery, and cooperates with the geometric constraints of the stepped receiving part to reduce the peak impact force by 58%. This design has been tested for durability for tens of thousands of times, and its impact resistance meets the highest level requirements of GB / T 8478-2020.

[0110] (4) It not only strengthens the vertical stiffness to improve the bending resistance, but also has a compact horizontal layout to save installation space.

[0111] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A door frame, characterized in that: The invention comprises a left frame, an upper frame, a right frame and a lower frame connected in sequence and forming a rectangular frame, wherein the left frame is parallel to the right frame, the upper frame is parallel to the lower frame and is symmetrically arranged along the axis, and the left frame is perpendicular to the upper frame; The upper frame and the lower frame each include a first bearing portion, a first connecting portion, and a second bearing portion. The first bearing portion, the first connecting portion, and the second bearing portion in the upper frame are sequentially connected along a direction from the upper frame to the lower frame. The first bearing portion and the second bearing portion in the upper frame are respectively inverted isosceles trapezoids, and the first connecting portion in the upper frame is a rectangular parallelepiped. The first bearing portion, the first connecting portion, and the second bearing portion in the lower frame are sequentially connected along a direction from the lower frame to the upper frame. The first bearing portion and the second bearing portion in the lower frame are respectively isosceles trapezoids, and the first connecting portion in the lower frame is a rectangular parallelepiped. The upper bottom surface of the first bearing portion is connected to one side of the first connecting portion, and the lower bottom surface of the second bearing portion is connected to the other side of the first connecting portion; the area of ​​the first bearing portion is larger than that of the second bearing portion; The left frame and the right frame each include an oblique supporting portion corresponding to the first bearing portion, a second connecting portion corresponding to the first connecting portion, and a stepped supporting portion corresponding to the second bearing portion on one side near the upper frame and the lower frame. The oblique supporting portion is a right-angled triangular prism, the second connecting portion is a rectangular parallelepiped, and the stepped supporting portion is a right-angled trapezoidal prism. The oblique side surface of the oblique supporting portion in the left frame contacts the left waist side surface of the first bearing portion, and the oblique side surface of the oblique supporting portion in the right frame contacts the right waist side surface of the first bearing portion; the right side surface of the second connecting portion in the left frame and the left side surface of the first connecting portion, the right side surface of the second connecting portion in the left frame and the right side surface of the first connecting portion, the oblique side surface of the stepped supporting portion in the left frame and the left waist side surface of the second bearing portion, and the oblique side surface of the stepped supporting portion in the right frame and the right waist side surface of the second bearing portion are respectively connected by snap fasteners; The orthographic projection distance between the lower bottom surface of the first supporting portion and the upper bottom surface of the second supporting portion along the direction from the upper frame to the lower frame is a, and the width of the left frame and the right frame along the direction from the left frame to the right frame is b, a>b.

2. The door leaf frame according to claim 1, characterized in that: Along the direction from the left frame to the right frame, the extended plane of the left waist side surface of the first supporting portion intersects with the extended plane of the left side surface of the first connecting portion to form a first obtuse angle, and the opening of the first obtuse angle faces the left frame; the extended plane of the right waist side surface of the first supporting portion intersects with the extended plane of the right side surface of the first connecting portion to form a second obtuse angle, and the opening of the second obtuse angle faces the right frame; the extended plane of the left waist side surface of the second supporting portion intersects with the extended plane of the left side surface of the first connecting portion to form a third obtuse angle, and the opening of the first obtuse angle faces the right frame; the extended plane of the right waist side surface of the second supporting portion intersects with the extended plane of the right side surface of the first connecting portion to form a fourth obtuse angle, and the opening of the fourth obtuse angle faces the left frame; Along the direction from the upper frame to the lower frame, the extension plane of the oblique side surface of the oblique supporting portion in the left frame intersects with the extension plane of the right side surface of the second connecting portion in the left frame, forming a fifth obtuse angle matching the first obtuse angle, and the first obtuse angle contacts the fifth obtuse angle. The extension plane of the oblique side surface of the oblique supporting portion in the right frame intersects with the extension plane of the left side surface of the second connecting portion in the right frame, forming a sixth obtuse angle matching the second obtuse angle, and the second obtuse angle contacts the sixth obtuse angle; the extension plane of the oblique side surface of the step supporting portion in the left frame intersects with the extension plane of the right side surface of the second connecting portion in the left frame, forming a seventh obtuse angle matching the third obtuse angle, and the third obtuse angle contacts the seventh obtuse angle. The extension plane of the oblique side surface of the step supporting portion in the right frame intersects with the extension plane of the left side surface of the second connecting portion in the right frame, forming an eighth obtuse angle matching the fourth obtuse angle, and the fourth obtuse angle contacts the eighth obtuse angle.

3. The door leaf frame according to claim 1, characterized in that: A first card slot is formed on a side of the second connecting portion close to the first connecting portion, and the first card slot is recessed toward a side away from the first connecting portion; a second card slot is formed on a side of the stepped receiving portion close to the second bearing portion, and the second card slot is recessed toward a side away from the second bearing portion, and a length extension direction of the second card slot intersects a length extension direction of the first card slot; A third card slot communicating with the first card slot is formed on a side of the first connecting portion close to the second connecting portion, the third card slot being recessed away from the second connecting portion; a fourth card slot communicating with the second card slot is formed on a side of the second supporting portion close to the stepped supporting portion, the fourth card slot being recessed away from the stepped supporting portion; The fastener includes a first fastener strip and a second fastener strip, each of which is a cylindrical structure. The first fastener strip is plugged into the first card slot and the third card slot, and the second fastener strip is plugged into the second card slot and the fourth card slot.

4. The door leaf frame according to claim 3, characterized in that: The first connection portion has two sides along the direction from the left frame to the right frame that are at right angles to the length extension direction of the third card slot, and the second connection portion has a side close to the first connection portion that is at right angles to the length extension direction of the first card slot.

5. The door leaf frame according to claim 3, characterized in that: The left frame, the upper frame, the right frame, the lower frame, the first buckle strip and / or the second buckle strip are made of wood.

6. The door leaf frame according to claim 1, characterized in that: The upper bottom surface of the first bearing part and the lower bottom surface of the second bearing part are respectively equal to the long side surface of the first connecting part, or the upper bottom surface of the first bearing part is equal to the long side surface of the first connecting part, and the long side surface of the first connecting part is larger than the lower bottom surface of the second bearing part.

7. The door leaf frame according to claim 1, characterized in that: The left frame and the right frame further include a third connecting portion, which is a rectangular parallelepiped. The third connecting portion in the left frame is located between the two step receiving portions in the left frame, and the third connecting portion in the right frame is located between the two step receiving portions in the right frame.

8. The door leaf frame according to claim 1, characterized in that: The width ratio between a and b ranges from 0.25 to 0.

75.

9. A crack-proof door panel, characterized in that: The door leaf frame comprises a door leaf frame and a door core, wherein the door leaf frame is any one of the door leaf frames of claims 1 to 8, and the door core is embedded in a rectangular frame surrounded by a left frame, an upper frame, a right frame and a lower frame.

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