A large industrial folding door

Abstract

The application relates to the technical field of folding doors, and particularly discloses a large industrial folding door which comprises upper and lower door frames and a plurality of door panels slidingly arranged in the door frames, adjacent door panels are connected through hinged shafts, the door panels have a retracted state and an unfolded state, the hinged shafts comprise a first hinged shaft group and a second hinged shaft group, limit grooves and sliding grooves are formed in the door frames, the end portions of the first hinged shaft group are slidingly arranged in the limit grooves, and the end portions of the second hinged shaft group are slidingly arranged in the sliding grooves, the leftmost door panel is hinged to the door frame, and elastic locking members are arranged on all the hinged shafts; when the door panels are moved in the unfolded state, the limit grooves press the elastic locking members, the elastic locking members are forced to lock the adjacent door panels, the door body is linearly and rigidly translated, the door panels are folded one by one, and the space occupation in the initial folding stage is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of folding doors, in particular to a large industrial folding door. BACKGROUND

[0002] Industrial doors are key components of modern logistics warehouses, production workshops, aircraft hangars and large public facilities, and their performance directly affects the space utilization, energy efficiency, operational safety and convenience of the building. For large-span facilities (usually more than 8 meters wide and more than 5 meters high), traditional types of industrial doors have different degrees of limitations in application.

[0003] The Chinese patent document with the authorization announcement number CN109296295B discloses an electric folding door, which comprises a top frame, a folding door frame is installed inside the top frame, a double-layer hollow tempered glass is embedded in the middle of the folding door frame, a jack is installed in the middle of the folding door frame, a supporting rod is installed at the top end and the bottom end of the jack, a top sealing strip is connected to the top end supporting rod of the jack, a bottom sealing strip is connected to the bottom end supporting rod of the jack, a roller is installed in the middle of the top end of the first folding door frame. The structure of this patent document is scientific and reasonable, safe and convenient to use. The folding door can be fixed by the jack, which is convenient for fixing and improves the sound insulation effect. It is convenient and fast, and saves manpower and material resources. The folding door is folded by the driven wheel driven by the servo motor, and the noise caused by the collision of the folding door is prevented by the interaction of the hydraulic device and the sponge pad, which affects the use of the folding door and brings convenience and speed to the normal use of the user.

[0004] The motor shaft is driven to rotate by the servo motor, and then the gear belt is driven to rotate by the motor shaft, so that the gear belt and the gear are proportionally rotated, thereby driving the folding door frame to move. However, during the movement of the folding door, all the door leaves are folded at the same time, which occupies a lot of space in the warehouse or workshop, and it is laborious to push all the door leaves to fold at the same time. The door leaves do not have a locking function after being folded, and in the case of other external forces, the folding door may be unfolded, which may cause harm to pedestrians or vehicles who are entering or leaving. SUMMARY

[0005] The present application provides a large industrial folding door, which aims to solve the problem of wasting space caused by the simultaneous rotation of all door leaves when opening or closing the large industrial folding door in the related art.

[0006] The utility model provides a large -scale industrial folding door, including upper and lower two door frame and the plurality of door leaf of slidingly arranged in the door frame, the hinge shaft is connected between adjacent door leaf, the door leaf has the contraction state and the unfolded state, the hinge shaft includes first hinge shaft group and second hinge shaft group, the door frame is opened in the limiting slot and the slide groove, the end of first hinge shaft group is slidingly arranged in the limiting slot, the end of second hinge shaft group is slidingly arranged in the slide groove, the leftmost door leaf is hinged on the door frame, all hinge shafts are provided with the elastic locking piece, and the end of elastic locking piece is abutted on the limiting slot, so that the elastic locking piece locks two adjacent door leaf, the left side of door frame has the aperture, when the elastic locking piece slides to the aperture range, the elastic locking piece releases the locking of door leaf, so that door leaf is converted to the contraction state, and all door leaf is folded from left to right one by one, the hinge shaft of second hinge shaft group has the sliding block, the hinge shaft on first hinge shaft group and the hinge shaft on second hinge shaft group are alternately arranged, and the sliding block is slidingly arranged in the slide groove, the elastic blocking piece is arranged in the slide groove close to the left edge of door frame, so that when door leaf is converted to the unfolded state, all door leaf is unfolded from right to left one by one.

[0007] Its effect lies in: when the door leaf is moved in the unfolded (closed) state, the limiting slot presses the elastic locking piece, so that it forcibly locks the adjacent door leaf, and the door body is in a straight line and rigidly translated. When moving to the left aperture, the locking piece is released from the compression and pops out of the lock, and the door leaf starts to fold. When unfolding in reverse, the elastic blocking piece in the slide groove blocks the sliding block, forcing the pulling force to pull the previous door leaf straight and lock it first, and then the sliding block passes the blocking piece to achieve one-by-one unfolding, achieving the "one-by-one folding" of the door leaf, greatly reducing the space occupation in the initial folding stage, improving the site utilization rate, converting the huge load of folding all hinges at the same time into a continuous load of single folding, significantly reducing the motor starting power, and the door leaf has a mechanical self-locking function in the unfolded state, improving the wind resistance and safety.

[0008] Preferably, the elastic locking piece comprises an abutting table, an elastic piece, an insertion block and an insertion slot; each of the two adjacent door plates has a mounting block, the mounting block has a mounting hole, the hinge shaft is rotationally connected with the mounting hole; the abutting table is hollow inside and is slidingly connected with the hinge shaft, the elastic piece is a spring, one end of the spring is connected inside the abutting table, and the other end is connected on the hinge shaft; the insertion block is fixedly arranged on the abutting table, the insertion slot is arranged between the two mounting holes, and the insertion block is matched with the insertion slot; when the top end of the abutting table abuts in the limiting slot, the insertion block is inserted into the insertion slot; when the abutting table enters the gap range, the insertion block is separated from the insertion slot; the physical displacement of the abutting table is limited by the bottom wall of the limiting slot, the spring is compressed, the insertion block is driven to be inserted into the insertion slot formed by the adjacent mounting block, and rigid connection is formed; when the abutting table enters the gap, the spring releases energy to lift the abutting table, the insertion block is pulled out, rotation freedom is restored, the structure is purely mechanical, no additional electrical control circuit is needed, and the reliability is high; through the matching of the insertion block and the insertion slot, a larger transverse shear force can be borne, and the firmness of the door plate connection is ensured.

[0009] Preferably, the abutting table is in the shape of a circular table, when the abutting table is in contact with the limiting slot, the side wall of the abutting table is in contact with the limiting slot to enable the elastic piece to be compressed; the design of the circular table shape (tapered shape) enables the abutting table to re-enter the limiting slot (locking state) from the gap (unlocking state) by using the principle of inclined surface guidance, and smoothly converts the horizontal thrust into vertical compression force, avoids the occurrence of jamming or dead lock of the abutting table when entering and exiting the slot, and ensures the smoothness of operation; meanwhile, the tapered surface matching has the function of automatic centering and can compensate for a certain wear gap.

[0010] Preferably, the elastic blocking piece comprises a mounting slot, a compression spring and a blocking block; the mounting slot is arranged on the inner wall of the sliding groove, the blocking block is slidingly arranged in the mounting slot, and the compression spring is mounted in the mounting slot; one end of the compression spring is connected to the blocking block, and the other end is connected to the bottom of the mounting slot; the end of the blocking block in contact with the sliding block is V-shaped, the sliding block is in contact with the blocking block to compress the compression spring, and then the sliding block can pass the blocking block; the V-shaped surface decomposes the thrust of the sliding block, realizes controllable blocking, ensures the sequence of the door plate unfolding, prevents the whole door plate from sliding under the condition that the door plate is not completely straightened and locked, and eliminates the shaking and noise in the closing process.

[0011] Preferably, the bottom of each hinge shaft of the second hinge shaft group is provided with a universal wheel rolling along the lower door frame; the universal wheel supports the weight of the door panel and rolls in the lower door frame, converting sliding friction into rolling friction and significantly reducing the driving resistance; meanwhile, the universal wheel can adapt to the changing angle of the door panel during folding.

[0012] Preferably, a tension spring is connected between the mounting blocks of two adjacent door panels, and is configured to pull the two adjacent door panels to make the included angle therebetween less than 180 degrees when the hinge shaft enters the gap range and the insertion block is disengaged from the insertion slot; at the moment of unlocking, the tension spring provides an initial torque to break the linear balance state of the door panel and make it have a small folding angle, effectively eliminating the "dead point" of the mechanism movement and preventing the door panel from being unable to fold after unlocking due to the force direction being parallel to the plane of the door panel.

[0013] Preferably, a linear motor is arranged on the upper and lower door frames and connected with the rightmost door panel, and is used to drive the door panel to move in the door frame; the linear motor directly provides linear driving force to drive the first door panel to move, and has a short transmission chain, high control precision, fast response speed, and is more quiet and convenient to maintain than a chain transmission.

[0014] Preferably, the mounting blocks are fixedly arranged on the side surface of the door panel, and the insertion slot is formed by the end surfaces of two adjacent mounting blocks when the door panel is unfolded; the insertion slot is not a complete hole but is formed by two half holes. Only when the two door panels are completely aligned in a straight line, the insertion slot forms a complete shape for the insertion block to be inserted into, and this design itself is a position detection mechanism, which ensures that the door panel can be locked only when it is completely straightened, preventing false locking; and also simplifies the processing technology.

[0015] Preferably, the limiting groove and the sliding groove are arranged in parallel on the door frame, and the depth of the gap is greater than the depth of the limiting groove to allow the elastic locking member to be axially displaced under the action of the elastic member; the depth difference of the gap provides physical space for the release of the elastic member, ensuring that the insertion block can be completely pulled out of the insertion slot, completely releasing the locking, and avoiding mechanical wear or movement interference caused by incomplete pulling out.

[0016] Preferably, the V-shaped end of the blocking block has two inclined surfaces respectively used for blocking the sliding block when the door panel is unfolded and guiding the sliding block to reset when the door panel is folded, and the two inclined surfaces of the V shape correspond to the forward stroke (unfolding) and the return stroke (folding) of the sliding block respectively, so that the door panel can be effectively blocked when closing (unfolding) to ensure the sequence, and can smoothly pass through the blocking block in reverse when opening (folding) without being stuck, realizing the logical closed loop of bidirectional movement.

[0017] By adopting the above technical solutions, the application has the following beneficial effects:

[0018] 1、The present application creates a "assembly line" folding logic by setting the gap on the left side of the door frame to cooperate with the elastic locking member. When the door panel is changing to the collapsed state, only the pair of door panels that have moved to the gap position (usually the storage area) will be unlocked and folded, and the remaining door panels will remain in a straight translational state. This makes the door body always occupy only a small part of the depth space of the storage area during the opening process, maximizing the effective use of the warehouse or workshop area and the width of the logistics channel;

[0019] 2、During the opening or closing process of the door panel, the drive device only needs to overcome the folding / unfolding resistance of a pair of door panels and the rolling friction of the remaining door panels at any time. This design significantly reduces the starting torque and operating power consumption of the system, allowing the use of smaller and less expensive drive motors, while also extending the service life of the motor and transmission mechanism;

[0020] 3、The present application uses the cooperation of the elastic locking member and the limiting groove to force the insertion of the block into the adjacent door panel's insertion slot under the action of the spring force after the door panel is unfolded and leaves the gap range. This mechanism allows the adjacent door panels to form a rigid mechanical interlock in the closed state, converting the flexible folding door into a solid "real wall". This not only significantly improves the wind pressure resistance of the door body, but also prevents the door body from being easily pushed open or pried open by external personnel, ensuring property safety;

[0021] 4、To solve the problem of door panel shaking and impact caused by inertia during rapid closing (unfolding), the present application sets an elastic blocking member in the sliding groove. The blocking member uses a V-shaped slope and a compression spring structure to apply a controllable resistance to the sliding block, forcing the door panel to unfold strictly according to the sequence of "straightening a pair, locking a pair, and releasing a pair". This design eliminates the disorderly shaking of the door panel during unfolding, avoids mechanical impact between hinges, and effectively reduces operating noise;

[0022] 5、The present application sets a tension spring between adjacent door panels, cooperating with the unlocking action of the gap. When the elastic locking member is unlocked at the gap, the tension spring immediately breaks the straight balance of the door panel, automatically giving the door panel a small pre-folding angle (making the angle less than 180 degrees). This small angle ensures that the subsequent horizontal thrust can be smoothly converted into the rotational torque of the door panel folding, eliminating the phenomenon of mechanism jamming and improving the reliability of the system under various working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the door body in the unfolded state of the present application.

[0024] Figure 2 is a structural schematic diagram of the door body, the first hinge shaft group and the second hinge shaft group of the present application.

[0025] 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.

[0026] Figure 4 This is a schematic diagram of the structure of the door body of the present invention in a folded state.

[0027] Figure 5 This is a schematic diagram of the structure of the elastic locking member of the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of the elastic blocking member of the present invention.

[0029] Figure 7 This is a schematic diagram of the tension spring and mounting block of the present invention.

[0030] Figure 8 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0031] Figure label:

[0032] 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

[0033] 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.

[0034] 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).

[0035] 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.

[0036] The section of the limiting groove 11 is rectangular or trapezoidal. The bottom wall of the limiting groove 11 must be smooth and flat, serving as a sliding track for the elastic locking piece 5. The key feature is that the side wall or the bottom wall of the limiting groove 11 is partially missing or has a sudden depth change at a position close to the leftmost side (storage area) of the door frame 1, forming an opening 13. The length of the opening 13 is slightly greater than the displacement range of the hinged shafts of the two door panels 2 after folding. The sliding groove 12 is parallel to the limiting groove 11.

[0037] The door panel 2 adopts a "sandwich" structure with double-layer color steel plates filled with polyurethane foam material, having excellent heat preservation, heat insulation, and sound insulation performance. The periphery of the door panel 2 is wrapped with an aluminum alloy edge, enhancing the structural strength. The sealing strip between the door panels 2 adopts a double-lip structure made of EPDM (ethylene propylene diene rubber) material. When the door panel 2 is folded, the soft rubber strip deforms under pressure and does not interfere with the movement. When the door panel 2 is unfolded and locked, the end faces of adjacent door panels 2 are tightly fitted, and the double-lip rubber strip forms an airtight cavity, effectively blocking rainwater and air penetration.

[0038] At corresponding positions on the side edges of adjacent door panels 2, mounting blocks 14 are welded or bolted, respectively. The mounting blocks 14 are made of stainless steel and have extremely high shear strength. The mounting blocks 14 protrude outward and are provided with vertical mounting holes. Hinged shafts are passed through the mounting holes to connect adjacent door panels 2.

[0039] In order to adapt to complex motion logic, the hinged shafts are divided into two categories: the first hinged shaft group 3 and the second hinged shaft group 4. The hinged shafts on the first hinged shaft group 3 and the second hinged shaft group 4 are arranged alternately. The top and bottom ends of the first hinged shaft group 3 extend into the limiting groove 11. The first hinged shaft group 3 is provided with elastic locking pieces 5. These hinged shafts mainly bear the locking function. The hinged shafts on the second hinged shaft group 4 are also provided with elastic locking pieces 5 and walking mechanisms, which are mainly responsible for guiding and bearing.

[0040] An elastic locking piece 5 is provided on each hinged shaft (including the hinged shafts on the first hinged shaft group 3 and the second hinged shaft group 4). The elastic locking piece 5 includes an abutting table 51, an elastic piece 52, an insertion block 53, and an insertion groove 54.

[0041] The abutting table 51 is located at the top end (or bottom end) of the hinge shaft. Its shape is preferably a circular table, that is, the top diameter is small, the bottom diameter is large, and the side is inclined. It is hollow inside, sleeved on the hinge shaft, and can slide up and down along the axis, but cannot rotate relative to the shaft (key groove cooperation can be achieved). The top surface of the abutting table 51 is made of wear-resistant material (such as nylon or polytetrafluoroethylene) and directly abuts against the bottom surface of the limiting groove 11. In this embodiment, the abutting table 51 is described as a circular table. The cleverness of this design is that when the abutting table 51 reenters the limiting groove 11 (locked state) from the gap 13 (unlocked state), there may be a slight positional deviation. The inclined surface of the circular table can guide and correct the deviation to prevent jamming. As the top of the abutting table 51 wears out over time, the spring will push the abutting table 51 to extend further, thereby automatically compensating for the wear gap and ensuring the tightness of the lock.

[0042] The elastic member 52 is a high-stiffness compression spring arranged between the abutting table 51 and the hinge shaft. In the normal state (when the abutting table 51 is pressed by the limiting groove 11), the spring is in a compressed energy storage state, generating a strong downward (or upward) pushing force.

[0043] The plug 53 is integrally formed or fixed to the lower part of the abutting table 51. Its shape is usually a rectangular or trapezoidal body, with a chamfered bottom end for easy insertion.

[0044] The insertion slot 54 is opened between the mounting blocks 14 connecting the two door panels 2. Specifically, when the two door panels 2 are in a flat state (180 degrees), the top surfaces of the left and right mounting blocks 14 combine to form a complete groove, that is, the insertion slot 54.

[0045] When the abutting table 51 slides in the limiting groove 11, the limiting groove 11 limits the height of the abutting table 51, forcing it to overcome the spring force and press downward, driving the plug 53 to deeply insert into the insertion slot 54. At this time, the plug 53 acts like a "wedge" that simultaneously locks the left and right mounting blocks 14, physically locking the relative rotation freedom of the two door panels 2, making them a rigid whole.

[0046] The gap 13 on the left side of the door frame 1 is a switch for system state conversion, and the depth of the gap 13 is greater than the depth of the limiting groove 11. When the door panel 2 is pushed to the left and the abutting table 51 on the first hinge shaft group 3 slides to the range of the gap 13, the elastic member 52 (spring) instantaneously releases energy and pushes the abutting table 51 to pop up (or outward) along the axis due to the loss of pressure from the bottom wall of the limiting groove 11. The abutting table 51 pops up and drives the plug 53 to completely disengage from the insertion slot 54. At this time, the mechanical locking between the two mounting blocks 14 is released, and the door panel 2 regains the ability to rotate around the hinge shaft and can be folded.

[0047] In the sliding groove 12, near the left side (folding area of the door panel 2), an elastic blocking piece 6 is installed, which includes a mounting groove 61, a blocking block 63, a compression spring 62 and a sliding block 7; the mounting groove 61 is a pit milled in the inner wall of the sliding groove 12, the blocking block 63 is slidingly installed in the mounting groove 61, the head of which extends into the sliding groove 12, and the head is designed as a V-shaped or bidirectional inclined surface structure, the compression spring 62 is installed behind the blocking block 63 and provides upward and downward extrusion force, the end of the second hinge shaft group 4 is provided with a sliding block 7, which is slidingly arranged in the sliding groove 12, when the door panel 2 is pulled open to the right from the folded state, the sliding block 7 moves in the sliding groove 12. When the sliding block 7 encounters the blocking block 63, the sliding block 7 will temporarily stop due to the obstruction of the blocking block 63. At this time, the pulling force will act on the door panel 2 that has passed the blocking block 63, making it completely straight. Only when the pulling force is large enough (i.e. the right door panel 2 is locked, and the pulling force is fully transmitted), the side surface of the sliding block 7 extrudes the V-shaped inclined surface of the blocking block 63, generating a component force to force the blocking block 63 to retract into the mounting groove 61, so that the sliding block 7 can pass the blocking point. This ensures that the door panels 2 are pulled out one by one.

[0048] The second hinge shaft group 4 is provided with a heavy load universal wheel 8 at the bottom, which supports the weight of the door panel 2 and reduces the suspension load on the upper door frame 1, making the movement more convenient.

[0049] A tension spring 9 is installed between the inner side surfaces of two adjacent door panels 2 or the mounting blocks 14. When the lock is released (the plug 53 is pulled out), if the door panel 2 is completely straight (180 degrees), the pushing force may cause the hinge to be stuck (dead point). The tension spring 9 provides a pre-tightening force, so that the door panel 2 automatically pops into 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 a folding torque, avoiding sticking.

[0050] The invention adopts a linear motor to directly drive the guide wheel of the rightmost door panel 2, or adopts a servo motor with a ball screw. The control system needs to be provided with a current monitoring module. When an abnormal rise in current is detected (such as sticking), the machine is immediately stopped and retracted to prevent forcibly pulling the locking plug 53.

[0051] The working principle of the invention is as follows:

[0052] Folding door opening process (from the unfolded state to the collapsed state): assuming that the door is in a fully closed state, all door panels 2 are in a straight line to seal the door opening. At this time, all elastic locking members 5 are located in the flat section of the limiting groove 11, and the plug block 53 is inserted into the plug groove 54. All door panels 2 are rigidly connected, the drive motor is started, and the rightmost door panel 2 is pulled to the left through the transmission chain. Since all door panels 2 are locked together, the entire door body moves to the left like a wall. When the first leftmost hinge shaft (and the elastic locking member 5 thereon) moves into the range of the left opening 13 of the door frame 1, the abutment table 51 loses the limit, the spring is pulled out, the plug block 53 is pulled out of the plug groove 54 of the mounting block 14, and the leftmost hinge shaft is unlocked. At the same time, due to the action of the tension spring 9, a small angle is automatically formed between the leftmost two door panels 2, and the folding door begins to rotate outward. At this time, the other hinge shafts have not reached the opening 13, and the two door panels 2 connected by the hinge shaft are still in the locked state, and continue to translate. As the other hinge shafts reach the opening 13, the two door panels 2 connected by the hinge shaft are unlocked, and the door panels 2 from left to right are sequentially unlocked and then neatly stacked in the left storage area. The motor only needs to overcome the folding resistance of a pair of door panels 2 at any time, rather than simultaneously overcoming the folding resistance of all door panels 2, the starting peak current is greatly reduced, the folding action only occurs in a small area on the left, and most of the right side of the door opening remains a straight passage during the opening process, unlike traditional doors that occupy the entire depth space from the beginning.

[0053] Folding door closing process (from the collapsed state to the unfolded state): assuming that the door is in a folded and stored state, all door panels 2 are crowded on the left, the drive motor is reversed, and the rightmost door panel 2 is pulled to the right. The rightmost door panel 2 moves to the right, pulling the door panels 2 connected thereto to unfold. At this time, the slider 7 on the second hinge shaft group 4 encounters the elastic blocking member 6 in the sliding groove 12. The resistance makes the stack of folded door panels 2 on the left not immediately spread out, and the tension 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 the connection thereof moves out of the range of the opening 13 and into the flat section of the limiting groove 11. The lead-in slope of the limiting groove 11 (or the circular table slope of the abutment table 51) forcibly presses down the abutment table 51, compresses the spring, and the plug block 53 is inserted into the plug groove 54. The two rightmost door panels 2 are locked in a straight line. After the current sequence door panel 2 is locked, the tension force is transmitted to the slider 7, overcoming the resistance of the compression spring 62, the slider 7 pushes away the blocking block 63, and overcomes the blocking point. This process occurs in a cycle, one pair is straightened, one pair is locked, and one blocking is overcome. 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 formed by the plug 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 member, ensuring physical safety.

[0054] In the second embodiment of the present application, in order to adapt to the demand of larger width of door hole, the folding door of the present application can also be designed as a bidirectional double-leaf structure. In this embodiment, the door panels 2 are divided into two groups, which are 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 vertical column of the door frame 1, and the rightmost door panel 2 of the right door panel group is hinged to the right vertical 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 as follows: the limiting grooves 11 are provided with openings 13 at the leftmost end and the rightmost end of the door frame 1. The opening 13 at the left end is used to cooperate with the elastic locking piece 5 of the left door panel group, and the opening 13 at the right end is used to cooperate with the elastic locking piece 5 of the right door panel group. The sliding groove 12 is provided with two elastic blocking pieces 6. The first elastic blocking piece 6 is located in the left end area of the sliding groove 12 and is used to block the sliding block 7 of the left door panel group. The second elastic blocking piece 6 is located in the right end area of the sliding groove 12 and is used to block the sliding block 7 of the right door panel group. A double linear motor or a bidirectional transmission mechanism is used to drive the rightmost (i.e. the middle joint) door panel 2 of the left door panel group and the leftmost (i.e. the middle joint) door panel 2 of the right door panel group, respectively. The driving device simultaneously pulls the left door panel group to move to the left and the right door panel group to move to the right. When the first hinge shaft group 3 of the left door panel group moves to the left opening 13, the left door panel group is unlocked one by one from left to right and is folded and stored on the left side. At the same time, when the first hinge shaft group 3 of the right door panel group moves to the right opening 13, the right door panel group is unlocked one by one from right to left and is folded and stored on the right side. Finally, the middle of the door hole is completely opened, and the driving device pushes the two groups of door panels 2 to move towards the middle. The left door panel group is affected by the left end elastic blocking piece 6 and is unfolded and locked one by one from right to left. The right door panel group is affected by the right end elastic blocking piece 6 and is unfolded and locked one by one from left to right. Finally, the left door panel group and the right door panel group converge at the center of the door hole, and the closing is completed.

[0055] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A large industrial folding door, comprising upper and lower door frames and multiple door panels slidably disposed within the door frames, wherein adjacent door panels are connected by hinge shafts, characterized in that: The door panel has a retracted state and an extended state, and the hinge shaft includes a first hinge shaft group and a second hinge shaft group. The door frame is provided with a limiting groove and a sliding groove. The end of the first hinge shaft group is slidably disposed in the limiting groove, and the end of the second hinge shaft group is slidably disposed in the sliding groove. The leftmost door panel is hinged to the door frame. All hinge axes are equipped with elastic locking components. The ends of the elastic locking components abut against the limiting grooves so that the elastic locking components lock the two adjacent door panels. There is a notch on the left side of the door frame. When the elastic locking components slide into the notch range, the elastic locking components release the locking of the door panels, so that when the door panels change 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. The hinge shafts on the first hinge shaft group and the hinge shafts on the second hinge shaft group are alternately arranged. The slider is slidably arranged in the slide groove. An elastic blocking element is provided in the slide groove near the left edge of the door frame so that when the door panel is transformed into the unfolded state, all door panels unfold one by one from right to left. The resilient locking mechanism includes a stop, a spring, a plug, and a slot. The stop is sleeved on the hinge shaft and can slide along the axial direction of the hinge shaft. The spring is a spring with one end connected to the stop and the other end connected to the hinge shaft. The plug is placed on the stop and the slot is placed between two adjacent door panels, with the plug and slot engaging. 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 in the mounting groove. The compression spring is installed in 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, thereby allowing the slider to pass over the blocking block.

2. The large industrial folding door according to claim 1, characterized in that, The abutment platform is frustum-shaped. When the abutment platform contacts the limiting groove, the side wall of the limiting groove abuts against the abutment platform so that the elastic element can be compressed.

3. The large industrial folding door according to claim 1, characterized in that, Each hinge axis of the second hinge axis group is provided with a caster wheel at its bottom, and the caster wheel rolls along the door frame below.

4. The large industrial folding door according to claim 1, characterized in that, Each of the two adjacent door panels is provided with a mounting block, and a tension spring is connected between the two mounting blocks. 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 is disengaged from the slot.

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

6. The large industrial folding door according to claim 4, characterized in that, The mounting block is fixedly installed 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.

7. The large industrial folding door according to claim 1, characterized in that, The limiting groove and the sliding groove are arranged parallel to each other on the door frame. 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.

8. The large industrial folding door according to claim 1, characterized in that, The V-shaped end of the blocking block has two bevels, which are used to block the slider when the door panel is unfolded and to guide the slider back to its original position when the door panel is folded.

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