Large industrial folding door

Abstract

The invention relates to the technical field of folding doors, and particularly discloses a large industrial folding door which comprises an upper door frame, a lower door frame and a plurality of door plates arranged in the door frames in a sliding mode, a hinge shaft is connected between every two adjacent door plates, and each door plate has a contracted state and an unfolded state. The articulated shaft comprises a first articulated shaft group and a second articulated shaft group; the door frame is provided with a limiting groove and a sliding groove, the end of the first hinge shaft set is arranged in the limiting groove in a sliding mode, and the end of the second hinge shaft set is arranged in the sliding groove in a sliding mode. The door plate on the leftmost side is hinged to the door frame, and all the hinge shafts are provided with elastic locking pieces. When the door plates move in the unfolded state, the limiting grooves press the elastic locking pieces to forcibly lock the adjacent door plates, the door bodies conduct linear rigid translation, one-by-one folding of the door plates is achieved, and occupied space in the initial folding stage is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of folding door technology, and specifically to a large industrial folding door. Background Technology

[0002] As a key component of modern logistics warehouses, production workshops, aircraft hangars, and large public facilities, industrial doors directly affect the building's space utilization, energy efficiency, operational safety, and ease of use. For facilities with large spans (typically exceeding 8 meters in width and 5 meters in height), traditional types of industrial doors have varying degrees of limitations in application.

[0003] Chinese patent document CN109296295B discloses an electric folding door, including a top frame, a folding door frame installed inside the top frame, double-layered hollow tempered glass embedded in the middle of the folding door frame, a jack installed in the middle of the folding door frame, support rods installed at the top and bottom of the jack, a top sealing strip connected to the top support rod of the jack, and a bottom sealing strip connected to the bottom support rod of the jack. A roller is installed at the middle of the top of the first folding door frame. This patent document has a scientifically sound and reasonable structure, is safe and convenient to use. The jack can fix the folding door, facilitating fixation and improving sound insulation. It is convenient, quick, and saves manpower and resources. Furthermore, a servo motor drives the driven wheel, thereby folding the door. The interaction between the hydraulic system and the sponge pad prevents the folding door from colliding and generating noise, thus affecting its use and providing convenience and speed for the user.

[0004] A servo motor drives a motor shaft to rotate, which in turn drives a gear belt to rotate proportionally, thus moving the folding gantry. However, during movement, all the folding doors fold simultaneously, taking up considerable space in the warehouse or workshop, and pushing all the doors fold at once is quite strenuous. Furthermore, the folded doors lack a locking function, meaning that external forces could cause the folding door to unfold, potentially injuring pedestrians or vehicles entering or exiting. Summary of the Invention

[0005] This invention provides a large industrial folding door, which aims to solve the problem of wasted space caused by all door panels rotating simultaneously when opening or closing large industrial folding doors in related technologies.

[0006] A large industrial folding door includes: upper and lower door frames and multiple door panels slidably disposed within the door frames. Adjacent door panels are connected by hinge shafts. The door panels have a retracted state and an unfolded state. Each hinge shaft includes a first hinge shaft group and a second hinge shaft group. Limit grooves and sliding grooves are formed on the door frames. The ends of the first hinge shaft groups are slidably disposed within the limit grooves, and the ends of the second hinge shaft groups are slidably disposed within the sliding grooves. The leftmost door panel is hinged to the door frame. All hinge shafts are provided with elastic locking elements, the ends of which abut against the limit grooves to allow for... The elastic locking member locks two adjacent door panels; the left side of the door frame has a notch, and when the elastic locking member slides into the range of the notch, the elastic locking member releases the locking of the door panel, so that when the door panel changes to the retracted state, all the door panels fold one by one from left to right; the hinge shaft of the second hinge shaft group has a slider, and the hinge shafts on the first hinge shaft group and the hinge shafts on the second hinge shaft group are alternately arranged, and the slider is slidably arranged in the slide groove; an elastic blocking member is provided in the slide groove near the left edge of the door frame, so that when the door panel changes to the unfolded state, all the door panels unfold one by one from right to left.

[0007] Its effect is as follows: When the door panel moves in the unfolded (closed) state, the limiting groove presses against the elastic locking element, forcibly locking the adjacent door panel, and the door body moves in a straight, rigid line. When it moves to the left opening, the locking element loses pressure and pops out to unlock, and the door panel begins to fold. When unfolding in the reverse direction, the elastic blocking element in the slide groove blocks the slider, forcing the pulling force to first straighten and lock the preceding door panel, and then the slider passes over the blocking element to achieve unfolding one by one, realizing the "one-by-one folding" of the door panel, which greatly reduces the space occupation in the initial folding stage, improves the space utilization rate, transforms the huge load of folding all hinges at the same time into the continuous load of a single fold, significantly reduces the motor starting power, and the door panel has a mechanical self-locking function in the unfolded state, improving wind resistance and safety.

[0008] Preferably, the elastic locking element includes an abutment platform, an elastic element, a plug, and a slot; each of the two adjacent door panels has a mounting block with a mounting hole, and the hinge shaft is rotatably connected to the mounting hole; the abutment platform is hollow inside and slidably connected to the hinge shaft; the elastic element is a spring, one end of which is connected to the inside of the abutment platform, and the other end is connected to the hinge shaft; the plug is fixedly disposed on the abutment platform, and the slot is formed between the two mounting holes, with the plug engaging with the slot; when the top of the abutment platform abuts... When the insert is within the limiting groove, it is inserted into the slot; when the abutment enters the notch range, the insert disengages from the slot; the bottom wall of the limiting groove restricts the physical displacement of the abutment, compresses the spring, and drives the insert to insert into the slot formed by the adjacent mounting block, forming a rigid connection; when the abutment enters the notch, the spring releases energy to lift the abutment, driving the insert to be pulled out, restoring free rotation. The structure is purely mechanical, requiring no additional electrical control circuitry, and has high reliability; through the cooperation of the insert and the slot, it can withstand a large lateral shear force, ensuring the firmness of the door panel connection.

[0009] Preferably, the abutment platform is frustum-shaped. When the abutment platform contacts the limiting groove, the side wall of the abutment platform contacts the limiting groove so that the elastic element can be compressed. The frustum-shaped (conical) design allows the abutment platform to smoothly convert the horizontal thrust into the vertical compression force when it re-enters the limiting groove from the notch (unlocked state) (locked state) using the inclined plane guiding principle, thus avoiding jamming or deadlock when the abutment platform enters or exits the groove and ensuring smooth operation. At the same time, the conical surface has an automatic centering function, which can compensate for a certain wear gap.

[0010] Preferably, the elastic blocking component includes a mounting groove, a compression spring, and a blocking block. The mounting groove is formed on the inner wall of the slide groove, the blocking block is slidably disposed within the mounting groove, and the compression spring is installed within the mounting groove. One end of the compression spring is connected to the blocking block, and the other end is connected to the bottom of the mounting groove. The end of the blocking block that contacts the slider is V-shaped. When the slider contacts the blocking block, the compression spring is compressed, allowing the slider to pass over the blocking block. The compression spring applies a preload to the blocking block, and when the slider passes over it, it must overcome this preload to push the blocking block away. The V-shaped surface decomposes the sliding force of the slider, achieving controllable blocking, ensuring the sequential unfolding of the door panel, preventing the door panel from sliding as a whole before it is fully straightened and locked, and eliminating shaking and noise during the closing process.

[0011] Preferably, each hinge shaft of the second hinge shaft group is provided with a universal wheel at its bottom, and the universal wheel rolls along the lower door frame; the universal wheel supports the weight of the door panel and rolls and guides it within the lower door frame, converting sliding friction into rolling friction, which significantly reduces driving resistance; at the same time, the universal wheel can adapt to the continuous changes in the angle of the door panel during the folding process.

[0012] Preferably, a tension spring is connected between the mounting blocks of two adjacent door panels. The tension spring is configured to pull the two adjacent door panels so that the included angle between them is less than 180 degrees when the hinge shaft enters the notch range and the insert disengages from the slot. At the moment of unlocking, the tension spring provides an initial torque to break the linear balance of the door panel, causing it to generate a small folding angle, effectively eliminating the "dead point" of the mechanism's movement, and preventing the door panel from being unable to fold and jamming after unlocking because the force direction is parallel to the door panel plane.

[0013] Preferably, linear motors are provided on the upper and lower door frames, and the linear motors are connected to the rightmost door panel to drive the door panel to move within the door frame; the linear motors directly provide linear driving force to drive the first door panel to move, resulting in a short transmission chain, high control precision, fast response speed, and quieter and easier maintenance compared to chain drives.

[0014] Preferably, the mounting block is fixedly disposed on the side of the door panel, and the slot is formed by the end faces of two adjacent mounting blocks joined together when the door panel is unfolded; the slot is not a pre-made complete hole, but is formed by two half holes joined together. The slot only forms a complete shape for the insertion block when the two door panels are completely aligned in a straight line. This design itself is a position detection mechanism, ensuring that locking only occurs when the door panel is fully straightened, preventing accidental locking; it also simplifies the manufacturing process.

[0015] Preferably, the limiting groove and the sliding groove are arranged parallel to each other on the door frame, and the depth of the notch is greater than the depth of the limiting groove, so as to allow the elastic locking member to generate axial displacement under the action of the elastic member; the depth difference of the notch provides physical space for the release of the elastic member, ensuring that the plug can be completely pulled out of the slot, completely releasing the lock, and avoiding mechanical wear or motion interference caused by incomplete removal.

[0016] Preferably, the V-shaped end of the blocking block has two inclined surfaces, which are used to block the slider when the door panel is unfolded and to guide the slider to reset when the door panel is folded. The two inclined surfaces of the V shape correspond to the outward (unfolded) and return (folded) strokes of the slider, respectively, so that the door panel can be effectively blocked to ensure the sequence when it is closed (unfolded), and can also smoothly pass over the blocking block in the opposite direction when it is opened (folded) without being stuck, thus realizing a logical closed loop of bidirectional movement.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. This invention creatively achieves a "production line" folding logic by setting a notch on the left side of the door frame in conjunction with an elastic locking component. When the door panels transition to the retracted state, only the pair of door panels that have moved to the notch position (usually the storage area) will unlock and fold, while the remaining door panels remain in a straight-line translational state. This ensures that the door always occupies only a small portion of the storage area's depth space during the opening process, maximizing the effective usable area and logistics channel width of the warehouse or workshop; 2. During the opening or closing process of the door panel, the drive unit only needs to overcome the folding / unfolding resistance of one pair of door panels and the rolling friction of the remaining door panels at any given time. This design significantly reduces the system's starting torque and operating power consumption, allowing the use of smaller, lower-cost drive motors, while also extending the service life of the motor and transmission mechanism; 3. This invention utilizes the cooperation of an elastic locking element and a limiting groove. After the door panel unfolds and leaves the notch area, the insert block is forced into the slot of the adjacent door panel under the action of spring force. This mechanism creates a rigid mechanical interlock between adjacent door panels when the door is closed, transforming the flexible folding door into a sturdy "solid wall." This not only significantly improves the door's wind pressure resistance but also prevents the door from being easily pushed open or pried open by outsiders, ensuring property safety. 4. To address the issue of door panels wobbling and impacting due to inertia during rapid closing (unfolding) of folding doors, this invention incorporates an elastic stopper within the slide rail. This stopper utilizes a V-shaped bevel and a compression spring structure to apply controllable resistance to the slider, forcing the door panels to unfold strictly in the sequence of "straightening one pair, locking one pair, releasing one pair." This design eliminates disorderly wobbling during door panel unfolding, avoids mechanical impact between hinges, and effectively reduces operating noise. 5. This invention incorporates a tension spring between adjacent door panels, which works in conjunction with the unlocking action of the notch. The moment the elastic locking element unlocks at the notch, the tension spring immediately breaks the linear balance of the door panel, automatically imparting a small pre-folding angle (less than 180 degrees) to the door panel. This small angle ensures that subsequent horizontal thrust can be smoothly converted into rotational torque for door panel folding, preventing mechanism jamming and improving the system's reliability under various operating conditions. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the door body in the unfolded state of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the door body, the first hinge shaft group, and the second hinge shaft group of the present invention.

[0020] Figure 3 This is a schematic diagram of the arrangement of the limiting groove and sliding groove on the door frame according to the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the door body of the present invention in a folded state.

[0022] Figure 5 This is a schematic diagram of the structure of the elastic locking member of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the elastic blocking member of the present invention.

[0024] Figure 7 This is a schematic diagram of the tension spring and mounting block of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0026] Figure label: 1. Door frame; 11. Limiting groove; 12. Sliding groove; 13. Notch; 14. Mounting block; 2. Door panel; 3. First hinge shaft assembly; 4. Second hinge shaft assembly; 5. Elastic locking element; 51. Abutment platform; 52. Elastic element; 53. Insert block; 54. Slot; 6. Elastic blocking element; 61. Mounting groove; 62. Compression spring; 63. Blocking block; 7. Slider; 8. Caster wheel; 9. Tension spring. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] like Figures 1-8 As shown, in the first embodiment of the present invention, it is mainly applied to large warehouses or heavy machinery manufacturing workshops. Its basic components include a frame system (including an upper door frame 1, a lower door frame 1, and side columns), a door system (composed of multiple rectangular door panels 2 hinged together in sequence), and a drive control system (not shown in detail in the figure, but usually includes a chain transmission mechanism driven by a linear motor or servo motor).

[0029] The upper door frame 1 and the lower door frame 1 are installed on the top beam of the door opening and the ground, respectively. These two door frames 1 are the load-bearing and guiding foundation of the entire system. They are usually made of high-strength aluminum alloy profiles or hot-dip galvanized steel sheets by cold bending to ensure sufficient rigidity and corrosion resistance. On the inner side of the door frame 1 (the bottom surface for the upper door frame 1 and the top surface for the lower door frame 1), two deep grooves are opened parallel to each other along the length direction, namely the limiting groove 11 and the sliding groove 12.

[0030] The limiting groove 11 has a rectangular or trapezoidal cross-section. The bottom wall of the limiting groove 11 must be flat and smooth, serving as the sliding track for the elastic locking element 5. A key feature is that, near the leftmost side of the door frame 1 (storage area), the side wall or bottom wall of the limiting groove 11 is partially missing or has an abrupt change in depth, forming a notch 13. The length of this notch 13 is slightly greater than the displacement range of the hinge axis after the two door panels 2 are folded. The sliding groove 12 is parallel to the limiting groove 11.

[0031] Door panel 2 adopts a "sandwich" structure with double-layer color steel plates filled with polyurethane foam, providing excellent heat insulation, sound insulation, and thermal insulation properties. Door panel 2 is surrounded by aluminum alloy edging to enhance structural strength. The sealing strip between door panels 2 uses a double-lip structure made of EPDM (ethylene propylene diene monomer) rubber. When door panel 2 is folded, the soft rubber strip deforms under pressure without interfering with movement. When door panel 2 is unfolded and locked, the end faces of adjacent door panels 2 fit tightly together, and the double-lip rubber strip forms an airtight cavity, effectively preventing rainwater and air penetration.

[0032] Mounting blocks 14 are welded or bolted to corresponding positions on the sides of adjacent door panels 2. The mounting blocks 14 are made of stainless steel casting and have extremely high shear strength. The mounting blocks 14 protrude outward and have vertical mounting holes. A hinge shaft is installed through the mounting holes to connect the two adjacent door panels 2.

[0033] To accommodate complex motion logic, the hinge shafts are divided into two categories: a first hinge shaft group 3 and a second hinge shaft group 4. The hinge shafts on the first hinge shaft group 3 and the second hinge shaft group 4 are alternately arranged. The top and bottom ends of the first hinge shaft group 3 extend into the limiting groove 11. The first hinge shaft group 3 is provided with elastic locking elements 5. These hinge shafts mainly bear the locking function. The hinge shafts on the second hinge shaft group 4 are also provided with elastic locking elements 5, and a traveling mechanism is also provided, which is mainly responsible for guidance and load bearing.

[0034] Each hinge axis (including the hinge axis on the first hinge axis group 3 and the hinge axis on the second hinge axis group 4) is fitted with an elastic locking member 5, which includes an abutment platform 51, an elastic member 52, an insert block 53 and a slot 54.

[0035] The abutment platform 51 is located at the top (or bottom) of the hinge shaft. Its shape is preferably frustum-shaped, i.e., a small top diameter, a large bottom diameter, and beveled sides. It is hollow inside and fits onto the hinge shaft, allowing it to slide up and down axially, but not to rotate relative to the shaft (this can be achieved through a keyway fit). The top surface of the abutment platform 51 is made of a wear-resistant material (such as nylon or polytetrafluoroethylene) and directly presses against the bottom surface of the limiting groove 11. In this embodiment, the abutment platform 51 is described as frustum-shaped. The ingenuity of this design lies in the fact that when the abutment platform 51 re-enters the limiting groove 11 (locked state) from the notch 13 (unlocked state), there may be a slight positional deviation. The beveled surface of the frustum acts as a guide, correcting the deviation and preventing jamming. As the abutment platform 51 wears over time, the spring pushes the abutment platform 51 further in due to the conical fit, automatically compensating for wear gaps and ensuring the tightness of the lock.

[0036] The elastic element 52 is a high-stiffness compression spring disposed inside the abutment platform 51 and between it and the hinge shaft. Under normal conditions (when the abutment platform 51 is pressed by the limiting groove 11), the spring is in a compressed and energy-storing state, generating a strong downward (or upward) thrust.

[0037] The insert 53 is integrally formed or fixed to the lower part of the abutment platform 51. Its shape is usually cuboid or trapezoidal with chamfered bottom for easy insertion.

[0038] The slot 54 is located between the mounting blocks 14 that connect the two door panels 2. Specifically, when the two door panels 2 are in a flat position (180 degrees), the top surfaces of the two mounting blocks 14 on the left and right sides fit together to form a complete groove, namely the slot 54.

[0039] When the abutment platform 51 slides within the limiting groove 11, the limiting groove 11 restricts the height of the abutment platform 51, forcing it to overcome the spring force and press downwards, causing the insertion block 53 to be deeply inserted into the slot 54. At this time, the insertion block 53 acts like a "wedge" to simultaneously lock the two mounting blocks 14 on the left and right, physically locking the relative rotational freedom of the two door panels 2, making them a rigid whole.

[0040] The notch 13 on the left side of the door frame 1 is a switch for system state transition. The depth of the notch 13 is greater than the depth of the limiting groove 11. When the door panel 2 is pushed to the left, the abutment platform 51 on the first hinge axis group 3 slides into the range of the notch 13. Due to the loss of pressure from the bottom wall of the limiting groove 11, the elastic element 52 (spring) instantly releases energy, pushing the abutment platform 51 to bounce upward (or outward) axially. The bounce of the abutment platform 51 causes the insert block 53 to completely disengage from the slot 54. At this time, the mechanical lock between the two mounting blocks 14 is released, and the door panel 2 regains its ability to rotate around the hinge axis and can be folded.

[0041] Within the slide groove 12, near the left side (the folding convergence area of ​​door panel 2), an elastic blocking element 6 is installed. The elastic blocking element 6 includes a mounting groove 61, a blocking block 63, a compression spring 62, and a slider 7. The mounting groove 61 is a recess milled into the inner wall of the slide groove 12. The blocking block 63 is slidably installed within the mounting groove 61, with its head extending into the slideway of the slide groove 12. The head is designed as a V-shape or a double-sided inclined structure. The compression spring 62 is installed behind the blocking block 63 and provides vertical compression force. A slider 7 is installed at the end of the second hinge shaft assembly 4. The slider 7 is slidably positioned within the slide groove 12. When the door panel 2 is pulled open to the right from its folded state, the slider 7 moves within the slide groove 12. When the slider 7 encounters the blocking block 63, it temporarily stops due to the obstruction of the blocking block 63. At this time, the traction force preferentially acts on the door panel 2 that has already passed the blocking block 63, causing it to straighten completely. Only when the pulling force is large enough (i.e., the right door panel 2 is locked and all the pulling force is transmitted), the side of the slider 7 presses against the V-shaped slope of the blocking block 63, generating a component force that forces the blocking block 63 to retract into the mounting groove 61, allowing the slider 7 to pass the blocking point. This ensures that the door panels 2 are pulled out one after another.

[0042] The bottom of the second hinge shaft assembly 4 is equipped with heavy-duty casters 8, which support the weight of the door panel 2, reduce the hanging load on the upper door frame 1, and make movement easier.

[0043] A tension spring 9 is installed on the inner side of two adjacent door panels 2 or between mounting blocks 14. When the lock is released (the insert block 53 is pulled out), if the door panels 2 are perfectly straight (180 degrees), the pushing force may cause the hinge to jam (dead point). The tension spring 9 provides a preload, causing the door panels 2 to automatically spring to a small angle (e.g., 175 degrees) at the moment of unlocking. This small initial angle ensures that the subsequent horizontal pushing force can be smoothly converted into folding torque, avoiding jamming.

[0044] This invention uses a linear motor to directly drive the guide wheel of the rightmost door panel 2, or a servo motor in conjunction with a ball screw. The control system needs to be equipped with a current monitoring module. When an abnormal increase in current is detected (such as jamming), the machine will immediately stop and retract to prevent damage to the locking block 53 by forcibly pulling it.

[0045] Working principle of the invention: Folding door opening process (from unfolded state to retracted state): Assuming the door is fully closed, all door panels 2 are aligned in a straight line to seal the doorway. At this time, all elastic locking elements 5 are located in the straight section of the limiting groove 11. Under pressure, the insert block 53 is inserted into the slot 54. All door panels 2 are rigidly connected. The drive motor starts and pulls the rightmost door panel 2 to the left through the transmission chain. Since all door panels 2 are locked together, the entire door moves to the left like a wall. When the leftmost hinge pin (and its elastic locking element 5) moves into the notch 13 on the left side of the door frame 1, the abutment 51 loses its limit, the spring springs up, the insert 53 is pulled out of the slot 54 of the mounting block 14, and the leftmost hinge pin is released from its lock. At the same time, due to the action of the tension spring 9, the two leftmost door panels 2 automatically form a small angle and begin to rotate around the hinge pin, protruding and folding outward. At this time, the other hinge pins have not yet reached the notch 13, and the two door panels 2 connected by the hinge pins are still in the locked state, continuing to flatten. As the other hinge shafts reach the notch 13, the two door panels 2 connected by the hinge shafts will be unlocked. The door panels 2 from left to right will be unlocked in sequence and then neatly stacked in the storage area on the left. The motor only needs to overcome the folding resistance of a pair of door panels 2 at any time, instead of overcoming the folding resistance of all door panels 2 at the same time. The starting peak current is greatly reduced, and the folding action only occurs in a small area on the left. Most of the area on the right side of the doorway always maintains a straight passage during the opening process, and will not occupy the entire depth space at the beginning like a traditional door. Folding door closing process (from retracted state to unfolded state): Assuming the door is in the folded storage state, all door panels 2 are squeezed on the left side. The drive motor reverses direction, pulling the rightmost door panel 2 to the right. The rightmost door panel 2 moves to the right, pulling the door panel 2 connected to it to unfold. At this time, the slider 7 on the second hinge shaft group 4 encounters the elastic blocking member 6 in the slide groove 12. The resistance prevents the pile of folding door panels 2 on the left side from immediately unfolding. The pulling force first straightens the rightmost pair of door panels 2. When the two rightmost door panels 2 are completely straightened, the elastic locking member 5 at their connection point just moves out of the notch 13 range and into the straight section of the limiting groove 11. The guide slope of the limiting groove 11 (or the truncated cone slope of the abutment platform 51) forcibly presses down the abutment platform 51, compressing the spring. The insert block 53 is inserted into the slot 54, and the two rightmost door panels 2 are locked into a straight line. After the first door panel 2 is locked, the pulling force is rigid. The force is transferred to slider 7, which overcomes the resistance of spring 62. Slider 7 pushes aside blocking block 63 and passes the obstruction point. This process occurs repeatedly, straightening one pair, locking another pair, and passing the obstruction once. When the last pair of door panels 2 is pulled out and locked, the entire door body returns to a rigid planar door body. The closed door body is not a soft connection, but a mechanical rigid connection is formed by insert block 53, which can withstand huge wind pressure without deformation. Even if the motor is powered off, the door panels 2 cannot be easily pushed open or folded due to the presence of the locking device, ensuring physical safety.

[0046] In the second embodiment of the present invention, in order to accommodate the need for wider door openings, the folding door of the present invention can also be designed as a bidirectional opening structure. In this embodiment, the door panel 2 is divided into two groups, namely the left door panel group and the right door panel group. The leftmost door panel 2 of the left door panel group is hinged to the left column of the door frame 1, and the rightmost door panel 2 of the right door panel group is hinged to the right column of the door frame 1. In order to cooperate with this bidirectional opening and closing, the structure of the upper and lower door frames 1 is improved by the following mirror symmetry: the limiting groove 11 is provided with notches 13 at the leftmost and rightmost ends of the door frame 1. The notch 13 at the left end is used to cooperate with the elastic locking member 5 of the left door panel group, and the notch 13 at the right end is used to cooperate with the elastic locking member 5 of the right door panel group. Two elastic blocking members 6 are provided in the sliding groove 12. The first elastic blocking element 6 is located at the left end of the slide groove 12, used to block the slider 7 of the left door panel assembly; the second elastic blocking element 6 is located at the right end of the slide groove 12, used to block the slider 7 of the right door panel assembly. A dual linear motor or bidirectional transmission mechanism is used to drive the rightmost (i.e., the middle joint) door panel 2 of the left door panel assembly and the leftmost (i.e., the middle joint) door panel 2 of the right door panel assembly, respectively. The driving device simultaneously pulls the left door panel assembly to the left and the right door panel assembly to the right. When the first hinge axis group 3 of the left door panel assembly moves to the left end notch 13, the left door panel assembly unlocks from left to right and folds away on the left side. Simultaneously, when the first hinge axis group 3 of the right door panel assembly moves to the right end notch 13, the right door panel assembly unlocks from right to left and folds away on the right side. Finally, the door opening is completely open in the middle, the driving device pushes the two sets of door panels 2 towards the center, and the left door panel assembly, under the action of the left end elastic blocking element 6, unfolds and locks from right to left. The right door panel assembly unfolds and locks one by one from left to right under the action of the elastic blocking member 6 at the right end. Finally, the left and right door panel assemblies meet at the center of the doorway, completing the closure.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A large industrial folding door, comprising upper and lower door frames (1) and a plurality of door panels (2) slidably disposed within the door frames (1), wherein adjacent door panels (2) are connected by hinge shafts, characterized in that: The door panel (2) has a retracted state and an unfolded state, and the hinge shaft includes a first hinge shaft group (3) and a second hinge shaft group (4). The door frame (1) is provided with a limiting groove (11) and a sliding groove (12). The end of the first hinge shaft group (3) is slidably disposed in the limiting groove (11), and the end of the second hinge shaft group (4) is slidably disposed in the sliding groove (12). The leftmost door panel (2) is hinged to the door frame (1). All the hinge axes are provided with elastic locking members (5). The end of the elastic locking member (5) abuts against the limiting groove (11) so that the elastic locking member (5) locks the two adjacent door panels (2). The left side of the door frame (1) has a notch (13). When the elastic locking member (5) slides into the range of the notch (13), the elastic locking member (5) releases the locking of the door panel (2) so that when the door panel (2) changes to the retracted state, all the door panels (2) fold from left to right one by one. The second hinge shaft group (4) has a slider (7) on its hinge shaft. The hinge shafts on the first hinge shaft group (3) and the hinge shafts on the second hinge shaft group (4) are alternately arranged. The slider (7) is slidably arranged in the slide groove (12). An elastic blocking member (6) is provided in the slide groove (12) near the left edge of the door frame (1) so that when the door panel (2) is turned into the unfolded state, all the door panels (2) unfold one by one from right to left.

2. The large industrial folding door according to claim 1, characterized in that, The elastic locking element (5) includes an abutment (51), an elastic element (52), a plug (53), and a slot (54); the abutment (51) is sleeved on the hinge shaft and can slide along the axial direction of the hinge shaft; the elastic element (52) is a spring, one end of which is connected to the abutment (51) and the other end is connected to the hinge shaft; the plug (53) is disposed on the abutment (51), and the slot (54) is disposed between two adjacent door panels (2), with the plug (53) cooperating with the slot (54).

3. The large industrial folding door according to claim 2, characterized in that, The abutment platform (51) is frustum-shaped. When the abutment platform (51) contacts the limiting groove (11), the side wall of the limiting groove (11) abuts against the abutment platform (51) so that the elastic element (52) can be compressed.

4. The large industrial folding door according to claim 1, characterized in that, The elastic blocking member (6) includes a mounting groove (61), a compression spring (62), and a blocking block (63); the mounting groove (61) is formed on the inner wall of the slide groove (12), the blocking block (63) is slidably disposed in the mounting groove (61), the compression spring (62) is installed in the mounting groove (61), one end of the compression spring (62) is connected to the blocking block (63), and the other end is connected to the bottom of the mounting groove (61); the end of the blocking block (63) that contacts the slider (7) is V-shaped, and when the slider (7) contacts the blocking block (63), the compression spring (62) is compressed, thereby allowing the slider (7) to pass over the blocking block (63).

5. The large industrial folding door according to claim 1, characterized in that, Each hinge shaft of the second hinge shaft group (4) is provided with a universal wheel (8) at its bottom, and the universal wheel (8) rolls along the door frame (1) below.

6. The large industrial folding door according to claim 2, characterized in that, Each of the two adjacent door panels (2) is provided with a mounting block (14), and a tension spring (9) is connected between the two mounting blocks (14). The tension spring (9) is configured to pull the two adjacent door panels (2) so that the included angle between them is less than 180 degrees when the hinge shaft enters the range of the notch (13) and the insert (53) disengages from the slot (54).

7. The large industrial folding door according to claim 1, characterized in that, Linear motors are installed on the upper and lower door frames (1). The linear motors are connected to the rightmost door panel (2) and are used to drive the door panel (2) to move within the door frame (1).

8. The large industrial folding door according to claim 6, characterized in that, The mounting block (14) is fixedly installed on the side of the door panel (2), and the slot (54) is formed by the end faces of two adjacent mounting blocks (14) when the door panel (2) is unfolded.

9. The large industrial folding door according to claim 2, characterized in that, The limiting groove (11) and the sliding groove (12) are arranged parallel to each other on the door frame (1). The depth of the notch (13) is greater than the depth of the limiting groove (11) so as to allow the elastic locking member (5) to generate axial displacement under the action of the elastic member (52).

10. The large industrial folding door according to claim 4, characterized in that, The V-shaped end of the blocking block (63) has two bevels, which are used to block the slider (7) when the door panel (2) is unfolded and to guide the slider (7) to reset when the door panel (2) is folded.

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