A rotating folding bolt-free automatic limit air inlet door structure and operation method

Abstract

The present invention discloses a rotary folding type bolt-free automatic limit air inlet door structure and operation method, comprising an air inlet cover assembly, an insert frame assembly, a face frame hinge assembly, a rotary folding filter device, and a pull rope assembly. The insert frame assembly is hinged to the air inlet cover assembly, the pull rope assembly is connected between the insert frame assembly and the air inlet cover assembly, the rotary folding filter device can be received in the insert frame assembly and can also be pulled out from the insert frame assembly, the left and right pressure plate assemblies are respectively hinged to the two sides of the grille plate assembly, the left pressure plate assembly and the right pressure plate assembly can be rotated and switched between a first position and a second position, in the first position, the left and right pressure plate assemblies are located on both sides of the large pressure plate, and in the second position, the left and right pressure plate assemblies are located on the upper part of the large pressure plate and can rotate together with the large pressure plate. The present invention does not require a bolt-fastened structure and can achieve a high-strength, high-efficiency, easy-to-operate, and automatically limit-fastened structural form to the greatest extent.

Description

Technical Field

[0001] The present invention belongs to the field of rail transportation technology, and in particular relates to a rotary folding bolt-free automatic limiting air inlet door structure and an operating method. Background Art

[0002] Currently, due to the investment in subway construction, the demand for high-power traction and auxiliary converters in the rail transit sector is particularly prominent. As more and more subway lines are put into operation in key cities, the inspection, maintenance, and cleaning of air inlet devices for various equipment require more reasonable, convenient, and efficient operation methods. Conventional high-power converter air inlet devices generally use a stack of stainless steel wire mesh, a single 30-mesh stainless steel wire mesh, or a sediment-type maze air inlet device. For cities with high or dense influx of willow and poplar catkins, flame-retardant filter cotton can be disposable within a frequent replacement cycle (for example, in Nanjing, the air inlet filter needs to be cleaned once a week from April to July. A train with six carriages has eight air inlets for the traction and auxiliary converters alone). This reduces the time required for personnel to clean the filters and the time it takes to dispatch vehicles, significantly reducing labor costs.

[0003] In addition to meeting the daily ventilation volume of the air inlet, the flame-retardant filter cotton can also filter out most dust, particles, catkins, hair, etc. When its specific replacement cycle comes, it can be directly removed and replaced without the need to disassemble the stainless steel filter for cleaning, drying, and then reinstalling.

[0004] Under normal circumstances, the filter cotton is placed in a hinged, opened, and compressed structure, which can compress the filter cotton flatly (compress the filter cotton from 8mm to 2mm), and the hinged compression and tightening with bolts can also make it firm and reliable. However, both of the above methods have the problem of an extra step in the operation process. For example, the hinged filter cotton device needs to be completely extracted from the insertion frame and then opened to replace the filter cotton; while the bolted fixing and tightening requires loosening and tightening the bolts to operate. Summary of the Invention

[0005] The purpose of the present invention is to provide a rotating and folding air inlet door structure and operation method with automatic bolt-free limiting, which realizes lightweight design through the overall simple structural form, meets the requirements of high strength, flatness, easy operation, automatic limiting and fixing without bolt tightening, original area replacement, and no need for overall extraction.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A rotary folding bolt-free automatic limit air inlet door structure, comprising an air inlet cover assembly, an insert frame assembly, a surface frame hinge assembly, a rotary folding filter device, and a pull rope assembly.

[0008] The insertion frame assembly is hinged to the air inlet cover assembly through a face frame hinge assembly, and the pull rope assembly is connected between the insertion frame assembly and the air inlet cover assembly. The rotary folding filter device can be received in the insertion frame assembly and can also be pulled out from the insertion frame assembly. The rotary folding filter device includes a grille plate assembly, a large pressure plate, a left pressure plate assembly, and a right pressure plate assembly. The large pressure plate is hinged to the grille plate assembly, and the filter cotton is placed between the large pressure plate and the grille plate assembly. The left pressure plate assembly and the right pressure plate assembly are respectively hinged to both sides of the grille plate assembly, and the left pressure plate assembly and the right pressure plate assembly can be rotated and switched between a first position and a second position. In the first position, the left pressure plate assembly and the right pressure plate assembly are located on both sides of the large pressure plate. In the second position, the left pressure plate assembly and the right pressure plate assembly are located on the upper part of the large pressure plate and can rotate together with the large pressure plate.

[0009] Furthermore, the rotary folding filter device also includes multiple groups of filter hinge assemblies, each group of filter hinge assemblies includes a first filter hinge and two second filter hinges, the second filter hinge is fixedly connected to the grille plate assembly through the second filter hinge threaded hole at the bottom, and a second filter hinge through hole is provided on the side of the second filter hinge. The first filter hinge includes a first filter hinge body and a rotating shaft located on both sides of the first filter hinge body, and the rotating shafts on both sides of the first filter hinge body are respectively located in the second filter hinge through holes of the two second filter hinges.

[0010] Furthermore, the left pressure plate assembly includes a pressure plate body, and the two ends of the pressure plate body are respectively connected to a pressure plate, the end of one of the pressure plates is hinged to the rotating mounting arm through a rotating column, and a welding circular hole is opened at the end of one of the pressure plates, and the bottom end of the rotating column is welded to the welding circular hole, and a rotating mounting arm through-hole is opened at one end of the rotating mounting arm to accommodate the rotating column, and a rotating mounting arm threaded hole is opened at the bottom of the other end of the rotating mounting arm, and the rotating mounting arm is fixedly connected to the large pressure plate by a countersunk screw that cooperates with the threaded hole of the rotating mounting arm. A cross bar is connected between the two pressure plates, and the left pressure plate assembly and the right pressure plate assembly have the same structure.

[0011] Furthermore, a retractable groove is provided at the end of the first filter hinge body, a limiting column is provided on both sides of the grille plate assembly, a locking block is provided on the pressure plate body, and the locking block has a notch. When in the second position, the cross bar is at least partially accommodated in the retractable groove, and when in the first position, the limiting column is locked in the notch of the locking block.

[0012] Furthermore, the insertion frame assembly includes an insertion frame assembly body, a pull rope bracket, a limiting spring, two spring mounting blocks, and a clamping slider. The clamping slider is fixed in the insertion frame assembly. One end of the limiting spring is fixed to the insertion frame assembly body through two spring mounting blocks. The other end of the limiting spring extends into the insertion frame assembly. When the rotary folding filter device is received into the insertion frame assembly, it will be compressed between the limiting spring and the clamping slider. The pull rope bracket is fixed to the insertion frame assembly body.

[0013] Furthermore, a threaded hole is provided on the clamping slider through which the clamping slider passes, the end of the clamping slider on the opposite side to the limiting spring has an inclined surface, one end of the limiting spring has a limiting spring fixing hole, a spring mounting block threaded hole is provided on one surface of the spring mounting block, and a limiting spring mounting hole is provided on the other surface.

[0014] Furthermore, the air inlet cover assembly includes a lower frame, an upper frame and two side frames that are interconnected to form a frame structure, the two side frames are respectively connected to an L-shaped bracket through a first rivet, the inner side of the lower frame is connected to a Z-shaped bracket, and the upper frame is connected to a U-shaped top frame through a second rivet, and the side of the U-shaped top frame has a plurality of bosses, and the top of the large pressure plate and the left pressure plate assembly is provided with a tightening rectangular hole that cooperates with the boss, one of the side frames is fixedly connected to the anti-slip pin fixing plate, and the top of the upper frame is connected to the mounting seat through a rivet nut, and the top of the mounting seat is connected with a locking buckle, and the air inlet door structure also includes a buckle that cooperates with the locking buckle and an anti-slip pin that cooperates with the anti-slip pin fixing plate.

[0015] Furthermore, the face frame hinge assembly includes a first face frame hinge and two second face frame hinges, the two second face frame hinges are fixedly connected to the lower frame, the left and right surfaces of one end of the first face frame hinge are hinged to the two second face frame hinges, and the other end is fixedly connected to the insert frame assembly body.

[0016] Furthermore, the pull rope assembly includes a safety rope, a first belt loop spring hook, a cable tie and a second belt loop spring hook, the first belt loop spring hook and the second belt loop spring hook are respectively connected to the two ends of the safety rope, and the cable tie can be tied to the overlap of the safety rope.

[0017] According to the above-mentioned method for operating the rotary folding type bolt-free automatic limit air inlet door structure, the operation includes installing and replacing the filter cotton.

[0018] The steps for installing the filter cotton are:

[0019] Step 1: Install the air inlet duct assembly on the door panel using one bolt. Pass one end of the safety rope through the first loop spring hook and wrap it around it. Then, insert the other end of the safety rope into the second loop spring hook. Pinch open the second loop spring hook and install it in the round hole on the cable bracket of the subrack assembly. Then, pinch open the first loop spring hook and install it in the cable bracket of the door panel. Flip the subrack assembly to an angle between 80° and 85°. Secure the safety rope at the joint with a cable tie to secure the cable assembly.

[0020] Step 2: Flip over the large pressure plate of the assembled rotary folding filter device and insert 8mm filter cotton. Since the grille plate assembly adopts the process of pressing the dead edge on all sides, the area where the ventilation holes are opened forms a 2mm height difference with the dead edge, which can compress the 8mm filter cotton within the height range of 2mm. The tight pressure on the edges makes the filter cotton more firmly placed in the clamping area between the grille plate assembly, the large pressure plate, and the left and right pressure plate assemblies.

[0021] Step 3: Insert the rotary pleated filter device into the U-shaped opening of the insert frame assembly. When it reaches the area of ​​the limit spring, it is blocked by the spring steel characteristics of the limit spring, so that the rotary pleated filter device is blocked at the limit spring. Use force to push it to the bottom so that the rotary pleated filter device can pass through. When passing through, the left and right pressure plate assemblies begin to contact the inclined surface of the pressing slider, giving it a function of limiting and gradually tightening. Therefore, after the rotary pleated filter device is pushed to the bottom, under the action of the pressing slider and the limit spring, the bottom areas on both sides of the rotary pleated filter device are tightly pressed to ensure that the filter cotton is not loose;

[0022] Step 4: Lift the subrack assembly and attach it to the air inlet cover assembly. The row of bosses on the U-shaped top frame of the air inlet cover assembly should extend into the corresponding rectangular holes on the left and right pressure plate assemblies and the upper end of the large pressure plate of the rotary folding filter device. Finally, flip the buckle, lock the buckle, and insert the anti-drop pin to ensure that the subrack assembly is completely combined with the air inlet cover assembly.

[0023] The steps for replacing the filter cotton are:

[0024] Step 5: Release the anti-drop pin, then release the buckle, and then flip the frame assembly. Under the action of the pull rope assembly, the opening angle of the frame assembly is limited to between 80° and 85°. Then pull the rotary folding filter device out a part of it, passing the area of ​​the limit spring, and then release your hand. Due to the characteristics of its spring steel, the limit spring will press into the interior of the frame assembly, forming a stop and limit effect to block the rotary folding filter device.

[0025] Step 6: Through the position distance of the stopper, the filter hinge assembly of the rotary folding filter device is formed, which is in the area that makes way for the bottom of the plug-in frame assembly. Hold the reinforcing cross bars of the left and right pressure plate assemblies, lift them up, and then rotate the left and right pressure plate assemblies from the first position to the filter hinge assembly of the large pressure plate and rotate it to the bottom to reach the second position. At this time, the cross bar is just placed in the retractable groove of the first filter hinge body. Then flip the large pressure plate to form an open state. Replace the filter cotton, and then there is no need to pull the rotary folding filter device out of the plug-in frame assembly as a whole.

[0026] Compared with the prior art, the present invention has the following significant advantages:

[0027] The present invention achieves a lightweight design through an overall simple structural form, meets the requirements of high strength, flatness, easy operation, automatic limit fixation without bolt fastening, replacement in the original area, and no need for overall extraction, and can replace the filter cotton in situ without the need for bolt fastening, so as to achieve a high strength, high efficiency, easy operation, and automatic limit fastening structural form to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of the opening of the rotating folding bolt-free automatic limit air inlet door structure.

[0029] Figure 2 This is a front view of the closed structure of the rotating and folding bolt-free automatic limit air intake door (with the grille plate hidden).

[0030] Figure 3 yes Figure 2 A partial enlarged view.

[0031] Figure 4 This is a rear view of the closed rotary folding bolt-free automatic limit air intake door structure.

[0032] Figure 5 yes Figure 4 A partial enlarged view.

[0033] Figure 6 This is a schematic diagram of the locking mechanism of the rotating and folding bolt-free automatic limit air inlet door and the door panel.

[0034] Figure 7 This is a schematic diagram of the air intake structure of a rotating, folding, bolt-free, automatic-limiting air intake door.

[0035] Figure 8 This is a side view of the open rotary folding bolt-free automatic limit air intake door structure.

[0036] Figure 9 It is a schematic diagram of the partial extraction of the rotary folding filter device.

[0037] Figure 10 yes Figure 9 Medium AA-directed graph.

[0038] Figure 11 yes Figure 10 A partial enlarged view.

[0039] Figure 12 This is a schematic diagram of the rotary folding filter device not being pulled out.

[0040] Figure 13 yes Figure 12 Medium AA-directed graph.

[0041] Figure 14 yes Figure 13 A partial enlarged view.

[0042] Figure 15 This is a partial structural breakdown diagram of the rotating, folding, bolt-free, automatic-limiting air inlet hood assembly.

[0043] Figure 16 yes Figure 15 Partial enlarged image.

[0044] Figure 17 This is a partial structural breakdown diagram of the rotating and folding air inlet cover assembly with bolt-free automatic limiting.

[0045] Figure 18 This is the main view of the pull rope assembly.

[0046] Figure 19 This is a top view of the pull rope assembly.

[0047] Figure 20 It is a schematic diagram of a rotary pleated filter device.

[0048] Figure 21 It is a schematic diagram of a rotary pleated filter device.

[0049] Figure 22 yes Figure 21 Partial enlarged image.

[0050] Figure 23 This is a schematic diagram of the left pressure plate assembly.

[0051] Figure 24 This is a disassembled diagram of the left pressure plate assembly structure.

[0052] Figure 25 yes Figure 24 Partial enlarged image.

[0053] Figure 26 yes Figure 23 Partial enlarged image.

[0054] Figure 27 is a schematic diagram of a rotating column.

[0055] Figure 28 is a schematic diagram of the rotating mounting arm.

[0056] Figure 29 is a schematic diagram of the rotating mounting arm.

[0057] Figure 30 This is a partial schematic diagram of the left pressure plate assembly.

[0058] Figure 31 This is a schematic diagram of the second filter hinge.

[0059] Figure 32 This is a schematic diagram of the hinge of the first filter.

[0060] Figure 33 This is a schematic diagram of the hinge of the first filter.

[0061] Figure 34 It is a schematic diagram of the opening of the rotary folding filter device.

[0062] Figure 35 Schematic diagram of the rotary pleated filter device closed.

[0063] Figure 36 It is a schematic diagram of the left and right pressure plate assemblies in the second position.

[0064] Figure 37 It is a schematic diagram of the rotation of the left pressure plate assembly.

[0065] Figure 38 It is a schematic diagram of the left and right pressure plate assemblies in the first position.

[0066] Figure 39 It is a schematic diagram of the left and right pressure plate assemblies in the first position.

[0067] Figure 40 yes Figure 39 Partial enlarged image.

[0068] Figure 41 yes Figure 38 Partial enlarged image.

[0069] Figure 42 It is a schematic diagram of the gap between the left and right pressure plate assemblies.

[0070] Figure 43 yes Figure 42 Partial enlarged image.

[0071] Figure 44 This is a schematic diagram of the cooperation between the pressure plate assembly and the limit column.

[0072] Figure 45 yes Figure 44 Partial enlarged image.

[0073] Figure 46 This is the main view of the large pressure plate.

[0074] Figure 47 This is a schematic diagram of the other side of the large pressure plate.

[0075] Figure 48 yes Figure 47 Partial enlarged image.

[0076] Figure 49 Schematic diagram of the clamping slider.

[0077] Figure 50 It is a schematic diagram of the limit spring.

[0078] Figure 51 This is a schematic diagram of the reed mounting block.

[0079] Figure 52 This is a schematic diagram of the reed mounting block.

[0080] Figure 53 This is a schematic diagram of the first face frame hinge.

[0081] Figure 54 This is a schematic diagram of the hinge of the second face frame.

[0082] Figure 55 This is a schematic diagram of the hinge of the second face frame.

[0083] Figure 56 Schematic diagram of the grille plate assembly.

[0084] Figure 57 yes Figure 56 Partial enlarged image.

[0085] Figure 58 yes Figure 56 Partial enlarged image.

[0086] Figure 59 Schematic diagram of the grille plate assembly.

[0087] Figure 60 This is a top view of the frame assembly body.

[0088] Figure 61 This is the main view of the frame assembly.

[0089] Figure 62 This is a side view of the frame assembly body.

[0090] Figure 63 This is a schematic diagram of the other side of the frame assembly body.

[0091] Figure 64 It is a three-dimensional schematic diagram of the frame assembly body.

[0092] Figure 65 It is a schematic diagram of the opening of the rotary folding filter device.

[0093] Figure 66It is a schematic diagram of extracting the rotary folding filter device.

[0094] Figure 67 It is a schematic diagram of extracting the rotary folding filter device.

[0095] Figure 68 This is a schematic diagram of lifting the large pressure plate and the left and right pressure plate assemblies.

[0096] Figure 69 This is a diagram for replacing filter cotton.

[0097] Figure 70 This is a schematic diagram of the large pressure plate and the left and right pressure plate assemblies being lowered.

[0098] Figure 71 It is a schematic diagram of retracting the rotary folding filter device.

[0099] Figure 72 This is a schematic diagram of the use of a rotating, folding, bolt-free, automatic-limiting air inlet door structure.

[0100] Figure 73 This is an enlarged view of the rotating and folding air inlet door structure with automatic limit and no bolts required.

[0101] The reference numerals in the accompanying drawings are: 1, air inlet cover assembly; 1-1, lower frame; 1-2, upper frame; 1-3, side frame; 1-4, U-shaped top frame; 1-5, large pressure plate; 1-6, Z-shaped bracket; 1-7, boss; 1-8, first rivet; 1-9, second rivet; 1-10, rivet nut; 1-11, locking buckle; 1-12, mounting base; 1-13, anti-drop pin fixing plate; 1-14, bolt; 2, subrack assembly; 2-1, subrack assembly body; 2-2, pull rope bracket; 2-3, clamping slider; 2-4, spring mounting block; 2-5, limit spring; 2-6, inclined surface; 2-7, threaded hole through the clamping slider; 2-8, limit spring fixing hole; 2-9, threaded hole for the spring mounting block; 2-10, limit spring mounting hole; 2-11, countersunk hole on the back side; 2-12, first screwdriver entry hole; 2-13, clamping block fixing hole; 2-14, second screwdriver entry hole; 2-15, buckle mounting block; 2-16, dead edge; 2-17, spring mounting base fixing hole; 2-18, rectangular hole for limit spring; 2-19, first face frame hinge mounting hole; 3, first face frame hinge; 3-1, first face frame hinge non-through threaded hole; 4, second face frame hinge; 4-1, second face frame hinge rotation axis; 4-2, second face frame hinge non-through threaded hole; 5, rotary folding filter device; 5-1, large pressure plate; 5-2, left pressure plate assembly; 5-3, right pressure plate assembly; 5-4, second filter hinge; 5-5, first filter hinge; 5-6, filter pad; 5-7, second filter hinge through hole; 5-8, second filter hinge threaded hole; 5-9. First filter screen hinge body; 5-10. Rotating axis; 5-11. Retractable slot; 5-13. Pressure plate body; 5-14. Pressure plate; 5-15. Cross bar; 5-16. Welding circular hole; 5-17. Rotating mounting arm; 5-18. Rotating column; 5-19. Positioning block; 5-20. Rotating mounting arm through circular hole; 5-21. Clamping rectangular hole; 5-22. Countersunk hole; 5-23. Rotating mounting arm threaded hole; 6. Grille plate assembly; 6-1. Grille plate assembly through circular hole; 6-2. Limiting column; 7. Pull rope assembly; 7-1. First spring hook with loop; 7-2. Cable tie; 7-3. Safety rope; 7-4. Second spring hook with loop; 8. Buckle; 9. Anti-drop pin. DETAILED DESCRIPTION

[0102] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0103] Combine Figure 1-73 A rotary folding type bolt-free automatic limit air inlet door structure, including an air inlet cover assembly 1, an insert frame assembly 2, a surface frame hinge assembly, a rotary folding filter device 5, and a pull rope assembly 7.

[0104] Combine Figure 15 、 17 , the insert frame assembly 2 is hinged to the air inlet cover assembly 1 through the face frame hinge assembly, the pull rope assembly 7 is connected between the insert frame assembly 2 and the air inlet cover assembly 1, the rotary folding filter device 5 can be received in the insert frame assembly 2, and can also be pulled out from the insert frame assembly 2, the rotary folding filter device 5 includes a grille plate assembly 6, a large pressure plate 5-1, a left pressure plate assembly 5-2, and a right pressure plate assembly 5-3, the large pressure plate 5-1 is hinged to the grille plate assembly 6, and the filter cotton 5-6 is placed between the large pressure plate 5-1 and the grille plate assembly 6 (combined with Figure 20-21 , 34-35), the left pressure plate assembly 5-2 and the right pressure plate assembly 5-3 are respectively hinged on both sides of the grid plate assembly 6, and the left pressure plate assembly 5-2 and the right pressure plate assembly 5-3 can be rotated and switched between the first position and the second position (combined with Figures 35-45 ), in the first position (such as Figure 35 As shown), the left pressure plate assembly 5-2 and the right pressure plate assembly 5-3 are located on both sides of the large pressure plate 5-1, and in the second position (as shown Figure 36 As shown in FIG, the left pressure plate assembly 5-2 and the right pressure plate assembly 5-3 are located on the upper portion of the large pressure plate 5-1 and can rotate together with the large pressure plate 5-1.

[0105] The folding filter device 5 is mainly made of stainless steel through cutting, bending and pressing. It is mainly composed of left and right pressure plate assemblies combined with the large pressure plate 5-1 through countersunk screws; and the large pressure plate 5-1 is combined with the grille plate assembly 6 through the filter hinge with countersunk screws. During the entire operation, the countersunk screws need to be injected with Loctite 263 glue (thread fastener) at the thread, so that the countersunk screws can achieve high-strength installation under the action of the thread fastener to prevent them from loosening. The lightweight air inlet cover assembly 1 is cut and bent into shape by aluminum plates, and then the various parts are riveted into shape by rivets. The high-strength, deformation-resistant plug-in frame assembly 2 is cut and bent into shape by stainless steel plates, and the upper end of the plug-in frame is provided with a pressing process, so that in the case of a large opening, it can enhance the deformation resistance of the area and increase the flatness of the area.

[0106] Specifically, combined Figure 20-22, 31-33, the rotary folding filter device 5 also includes a plurality of groups of filter hinge assemblies, each group of filter hinge assemblies includes a first filter hinge 5-5 and two second filter hinges 5-4, the second filter hinge 5-4 is fixedly connected to the grid plate assembly 6 through the second filter hinge threaded hole 5-8 at the bottom, and a second filter hinge through hole 5-7 is provided on the side of the second filter hinge 5-4, the first filter hinge 5-5 includes a first filter hinge body 5-9 and a rotating shaft 5-10 located on both sides of the first filter hinge body 5-9, and the rotating shafts 5-10 on both sides of the first filter hinge body 5-9 are respectively located in the second filter hinge through holes 5-7 of the two second filter hinges 5-4.

[0107] Specifically, combined Figure 23-30 The left pressure plate assembly 5-2 includes a pressure plate body 5-13, and the two ends of the pressure plate body 5-13 are respectively connected to a pressure plate 5-14, and the end of one of the pressure plates 5-14 is hinged to the rotating mounting arm 5-17 through a rotating column 5-18, and a welding circular hole 5-16 is opened at the end of one of the pressure plates 5-14, and the bottom end of the rotating column 5-18 is welded to the welding circular hole 5-16, and a rotating mounting arm through-hole 5-20 for accommodating the rotating column 5-18 is opened at one end of the rotating mounting arm 5-17, and a rotating mounting arm threaded hole 5-23 is opened at the bottom of the other end of the rotating mounting arm 5-17, and the rotating mounting arm 5-17 is fixedly connected to the large pressure plate 5-1 by a countersunk screw that cooperates with the rotating mounting arm threaded hole 5-23. A cross bar 5-15 is connected between the two pressure plates 5-14, and the left pressure plate assembly 5-2 and the right pressure plate assembly 5-3 have the same structure.

[0108] Specifically, combined Figure 32 、 45 , 56-58, a receiving groove 5-11 is provided at the end of the first filter hinge body 5-9, and a limiting column 6-2 is provided on both sides of the grille plate assembly 6, and a locking block 5-19 is provided on the pressure plate body 5-13, and the locking block 5-19 has a notch. When in the second position, the cross bar 5-15 is at least partially accommodated in the receiving groove 5-11, and when in the first position, the limiting column 6-2 is locked in the notch of the locking block 5-19.

[0109] Specifically, combined Figure 9-14, 16-17, 60-64, the plug-in frame assembly 2 includes a plug-in frame assembly body 2-1, a pull rope bracket 2-2, a limit spring 2-5, two spring mounting blocks 2-4, and a clamping slider 2-3, the clamping slider 2-3 is fixed in the plug-in frame assembly 2, one end of the limit spring 2-5 is fixed to the plug-in frame assembly body 2-1 through two spring mounting blocks 2-4, and the other end of the limit spring 2-5 extends into the plug-in frame assembly 2, when the rotary folding filter device 5 is received into the plug-in frame assembly 2, it will be compressed between the limit spring 2-5 and the clamping slider 2-3, and the pull rope bracket 2-2 is fixed to the plug-in frame assembly body 2-1.

[0110] Specifically, combined Figures 49-52 The clamping slider 2-3 is provided with a threaded hole 2-7 that penetrates the clamping slider. The end of the clamping slider 2-3 on the opposite side to the limiting spring 2-5 has an inclined surface 2-6. One end of the limiting spring 2-5 has a limiting spring fixing hole 2-8. A spring mounting block threaded hole 2-9 is provided on one surface of the spring mounting block 2-4, and a limiting spring mounting hole 2-10 is provided on the other surface.

[0111] Specifically, combined Figure 15 The air inlet cover assembly 1 includes a lower frame 1-1, an upper frame 1-2 and two side frames 1-3 connected to each other to form a frame structure. The two side frames 1-3 are respectively connected to an L-shaped bracket 1-5 through a first rivet 1-8. The inner side of the lower frame 1-1 is connected to a Z-shaped bracket 1-6. The upper frame 1-2 is connected to a U-shaped top frame 1-4 through a second rivet 1-9. The side of the U-shaped top frame 1-4 has a plurality of bosses 1-7. The top of the large pressure plate 5-1 and the left pressure plate assembly is provided with a tightening rectangular hole 5-21 (combined with the boss 1-7) Figure 3-5 , 30, 46), wherein one of the side frames 1-3 is fixedly connected to the anti-slip pin fixing plate 1-13, the top of the upper frame 1-2 is connected to the mounting seat 1-12 through a rivet nut 1-10, the top of the mounting seat 1-12 is connected with a locking buckle 1-11, and the air inlet door structure also includes a buckle 8 cooperating with the locking buckle 1-11 and an anti-slip pin 9 cooperating with the anti-slip pin fixing plate 1-13.

[0112] Specifically, combined Figure 17 、 53 -55, the face frame hinge assembly includes a first face frame hinge 3 and two second face frame hinges 4, the two second face frame hinges 4 are fixedly connected to the lower frame 1-1, the left and right surfaces of one end of the first face frame hinge 3 are hinged to the two second face frame hinges 4, and the other end is fixedly connected to the insert frame assembly body 2-1.

[0113] Specifically, combined Figure 18-19The pull rope assembly 7 includes a safety rope 7-3, a first loop spring hook 7-1, a cable tie 7-2 and a second loop spring hook 7-4. The first loop spring hook 7-1 and the second loop spring hook 7-4 are respectively connected to the two ends of the safety rope 7-3, and the cable tie 7-2 can be tied to the overlap of the safety rope 7-3.

[0114] According to the above-mentioned method for operating the rotary folding type bolt-free automatic limit air inlet door structure, the operation includes installing and replacing the filter cotton.

[0115] The steps for installing the filter cotton are:

[0116] Step 1: Install the air inlet duct assembly on the door panel through a circle of bolts 1-14. After one end of the safety rope 7-3 is passed through the first band spring hook 7-1 and wrapped around it, the other end of the safety rope 7-3 is inserted into the second band spring hook 7-4. Pinch the second band spring hook 7-4 and install it in the round hole on the rope bracket 2-2 of the subframe assembly. Then pinch the first band spring hook 7-1 and install it in the rope bracket of the door panel. After flipping the subframe assembly, control the angle between 80° and 85°. Tie the safety rope at the joint 7-3 with a cable tie 7-2 to complete the fixation of the rope assembly 7. Figure 1 、 8 , 65;

[0117] Step 2: Combine Figure 34 、 68 69. Fold over the large pressure plate 5-1 of the assembled rotary folding filter device and insert the 8mm filter cotton 5-6. Since the grille plate assembly 6 adopts the process of pressing the dead edge on all sides, there is a 2mm height difference between the area where the ventilation holes are opened and the dead edge. This can compress the 8mm filter cotton 5-6 within a height range of 2mm. The tight compression of the edges makes the filter cotton 5-6 more firmly placed in the clamping area between the grille plate assembly 6, the large pressure plate 5-1, and the left and right pressure plate assemblies.

[0118] Step 3: Insert the rotating folding filter device 5 into the U-shaped opening of the insert frame assembly 2, and when it reaches the area of ​​the limit spring 2-5, it is blocked by the spring steel characteristics of the limit spring 2-5, so that the rotating folding filter device 5 is blocked at the limit spring 2-5 (such as Figure 10-11), at this moment, a certain amount of force is needed to push it to the bottom. The most reasonable method is to push it to the bottom quickly during the insertion process. Under the action of the impact force, the R angle area of ​​the limiting spring is subjected to friction and extrusion force, and the elastic recovery of the material properties allows the rotary folded filter device 5 to pass through. When passing through, the left and right pressure plate assemblies begin to contact the inclined surface 2-6 of the pressing slider 2-3, giving it a function of limiting and gradually tightening. Therefore, after the rotary folded filter device 5 is pushed to the bottom, under the action of the pressing slider 2-3 and the limiting spring 2-5, the bottom areas on both sides of the rotary folded filter device 5 are tightly pressed to ensure that the filter cotton 5-6 is not loose. Figure 13-14 As shown;

[0119] Step 4: Lift the insertion frame assembly 2 and fit it onto the air inlet cover assembly 1. A row of bosses 1-7 on the U-shaped top frame 1-4 in the air inlet cover assembly 1 extend into the pressing rectangular holes 5-21 on the left and right pressure plate assemblies of the rotary folding filter device 5 and the upper end of the large pressure plate 5-1. The row of pressing rectangular holes 5-21 are larger than the bosses 1-7 in length and width, so that they can quickly and accurately correspond. The extended surfaces on both sides of the bosses 1-7 can be pressed on the pressure plates of the rotary folding filter device 5, so that they generate mutual force. Finally, flip the buckle 8, lock the buckle 8, and insert the anti-drop pin 9, so that the insertion frame assembly 2 is completely combined with the air inlet cover assembly 1, as shown. Figure 6 As shown;

[0120] The steps for replacing the filter cotton are:

[0121] Step 5: Loosen the anti-drop pin 9, then loosen the three sets of buckles 8, and then flip the frame assembly 2. Under the action of the pull rope assembly 7, the opening angle of the frame assembly 2 is limited to between 80° and 85°. Then pull the rotating folding filter device 5 with a little force. After pulling it out a part (almost past the area of ​​the limit spring 2-5), release your hand. Due to the characteristics of its spring steel, the limit spring 2-5 will press into the interior of the frame assembly 2, forming a stop and limit function to block the rotating folding filter device 5.

[0122] Step 6: Through the position distance of the stopper, the filter hinge assembly of the rotating folding filter device 5 is formed. In the area where the bottom of the frame assembly 2 is cleared, take the reinforcing cross bars 5-15 of the left and right pressure plate assemblies and lift them up (there is a 6mm gap, but only 4mm is needed. Figure 40 、 43 ) and then rotate the left and right pressure plate assemblies from the first position (such as Figure 35 As shown) rotates to the filter hinge assembly of the large pressure plate 5-1 to the end and reaches the second position (as shown) Figure 36 As shown), the flipping process is as follows Figures 35-37As shown, the crossbar 5-15 is now placed in the receiving groove 5-11 of the first filter hinge body 5-9 (as shown in FIG. Figure 22 As shown), then turn over the large pressing plate 5-1 to form an open state, and replace the filter cotton 5-6, as shown Figures 72-73 As shown, there is no need to pull the rotary folding filter device 5 out of the insertion frame assembly as a whole.

[0123] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotating foldable air inlet door structure with automatic limit without bolts, characterized in that: The utility model comprises an air inlet cover assembly (1), an insert frame assembly (2), a surface frame hinge assembly, a rotary folding filter device (5), and a drawstring assembly (7). The insert frame assembly (2) is hinged to the air inlet cover assembly (1) through the surface frame hinge assembly. The drawstring assembly (7) is connected between the insert frame assembly (2) and the air inlet cover assembly (1). The rotary folding filter device (5) can be received in the insert frame assembly (2) and can also be drawn out from the insert frame assembly (2). The rotary folding filter device (5) comprises a grille plate assembly (6), a large pressure plate (5-1), a left pressure plate assembly (5-2), and a right pressure plate assembly (5-3). The large pressure plate (5-1) and the grille plate assembly (6) are connected to each other. The assembly (6) is hinged, and the filter cotton (5-6) is placed between the large pressure plate (5-1) and the grid plate assembly (6). The left pressure plate assembly (5-2) and the right pressure plate assembly (5-3) are respectively hinged to the two sides of the grid plate assembly (6). The left pressure plate assembly (5-2) and the right pressure plate assembly (5-3) can be rotated and switched between a first position and a second position. In the first position, the left pressure plate assembly (5-2) and the right pressure plate assembly (5-3) are located on both sides of the large pressure plate (5-1). In the second position, the left pressure plate assembly (5-2) and the right pressure plate assembly (5-3) are located on the upper part of the large pressure plate (5-1) and can rotate together with the large pressure plate (5-1). The rotary folding filter device (5) further comprises a plurality of filter hinge assemblies, each filter hinge assembly comprising a first filter hinge (5-5) and two second filter hinges (5-4), the second filter hinge (5-4) being fixedly connected to the grid plate assembly (6) via a second filter hinge threaded hole (5-8) at the bottom, a second filter hinge through hole (5-7) being provided on the side of the second filter hinge (5-4), the first filter hinge (5-5) comprising a first filter hinge body (5-9) and rotating shafts (5-10) located on both sides of the first filter hinge body (5-9), the rotating shafts (5-10) on both sides of the first filter hinge body (5-9) being respectively located in the second filter hinge through holes (5-7) of the two second filter hinges (5-4); The left pressure plate assembly (5-2) includes a pressure plate body (5-13), and the two ends of the pressure plate body (5-13) are respectively connected to a pressure plate (5-14), the end of one of the pressure plates (5-14) is hinged to the rotating mounting arm (5-17) through a rotating column (5-18), and a welding hole (5-16) is opened at the end of one of the pressure plates (5-14), and the bottom end of the rotating column (5-18) is welded to the welding hole (5-16), and the rotating mounting arm (5-17) is hinged to the end of the rotating column (5-18). A rotating mounting arm through-hole (5-20) for accommodating a rotating column (5-18) is provided at one end of the rotating mounting arm (5-17); a rotating mounting arm threaded hole (5-23) is provided at the bottom of the other end of the rotating mounting arm (5-17); the rotating mounting arm (5-17) is fixedly connected to the large pressure plate (5-1) by a countersunk screw matched with the rotating mounting arm threaded hole (5-23); a crossbar (5-15) is connected between the two pressure plates (5-14); and the left pressure plate assembly (5-2) and the right pressure plate assembly (5-3) have the same structure.

2. The rotary foldable bolt-free automatic limit air intake door structure according to claim 1, characterized in that: A receiving and releasing groove (5-11) is provided at the end of the first filter hinge body (5-9), a limiting column (6-2) is respectively provided on both sides of the grid plate assembly (6), a locking block (5-19) is provided on the pressure plate body (5-13), and the locking block (5-19) has a notch. When in the second position, the cross bar (5-15) is at least partially accommodated in the receiving and releasing groove (5-11), and when in the first position, the limiting column (6-2) is locked into the notch of the locking block (5-19).

3. The rotary foldable bolt-free automatic limit air inlet door structure according to claim 2, characterized in that: The insert frame assembly (2) comprises an insert frame assembly body (2-1), a pull rope bracket (2-2), a limit spring (2-5), two spring mounting blocks (2-4), and a pressing slider (2-3). The pressing slider (2-3) is fixed in the insert frame assembly (2). One end of the limit spring (2-5) is fixed to the insert frame assembly body (2-1) through the two spring mounting blocks (2-4). The other end of the limit spring (2-5) extends into the insert frame assembly (2). When the rotary folding filter device (5) is received in the insert frame assembly (2), it is pressed between the limit spring (2-5) and the pressing slider (2-3). The pull rope bracket (2-2) is fixed to the insert frame assembly body (2-1).

4. The rotary foldable bolt-free automatic limit air inlet door structure according to claim 3, characterized in that: The clamping slider (2-3) is provided with a clamping slider penetrating threaded hole (2-7), the end of the clamping slider (2-3) on the surface opposite to the limiting spring (2-5) has an inclined surface (2-6), one end of the limiting spring (2-5) has a limiting spring fixing hole (2-8), and one surface of the spring mounting block (2-4) is provided with a spring mounting block threaded hole (2-9), and the other surface is provided with a limiting spring mounting hole (2-10).

5. The rotary foldable bolt-free automatic limit air inlet door structure according to claim 4, characterized in that: The air inlet cover assembly (1) comprises a lower frame (1-1), an upper frame (1-2) and two side frames (1-3) connected to each other to form a frame structure, wherein the two side frames (1-3) are respectively connected to an L-shaped bracket (1-5) via a first rivet (1-8), the inner side of the lower frame (1-1) is connected to a Z-shaped bracket (1-6), and the upper frame (1-2) is connected to a U-shaped top frame (1-4) via a second rivet (1-9), and the side of the U-shaped top frame (1-4) has a plurality of bosses (1-7). The large pressure plate (5-1) and the top of the left pressure plate assembly are provided with a tightening rectangular hole (5-21) that cooperates with the boss (1-7), one of the side frames (1-3) is fixedly connected to the anti-dropout pin fixing piece (1-13), the top of the upper frame (1-2) is connected to the mounting seat (1-12) through a rivet nut (1-10), the top of the mounting seat (1-12) is connected with a locking buckle (1-11), and the air inlet door structure also includes a buckle (8) that cooperates with the locking buckle (1-11) and an anti-dropout pin (9) that cooperates with the anti-dropout pin fixing piece (1-13).

6. The rotary foldable bolt-free automatic limit air inlet door structure according to claim 5, characterized in that: The face frame hinge assembly comprises a first face frame hinge (3) and two second face frame hinges (4), wherein the two second face frame hinges (4) are fixedly connected to the lower frame (1-1), and the left and right surfaces of one end of the first face frame hinge (3) are hinged to the two second face frame hinges (4), and the other end is fixedly connected to the insert frame assembly body (2-1).

7. The rotary foldable bolt-free automatic limit air inlet door structure according to claim 6, characterized in that: The pull rope assembly (7) comprises a safety rope (7-3), a first spring hook with a loop (7-1), a cable tie (7-2) and a second spring hook with a loop (7-4); the first spring hook with a loop (7-1) and the second spring hook with a loop (7-4) are respectively connected to two ends of the safety rope (7-3); and the cable tie (7-2) can be tied to the overlapping portion of the safety rope (7-3).

8. The method for operating the rotary foldable bolt-free automatic limiter air inlet door structure according to claim 7, characterized in that: The operation includes installing and replacing filter cotton. The steps for installing the filter cotton are: Step 1: Install the air inlet duct assembly on the door panel through a circle of bolts (1-14), pass one end of the safety rope (7-3) through the first loop spring hook (7-1) and wrap it around it, then insert the other end of the safety rope (7-3) into the second loop spring hook (7-4), pinch open the second loop spring hook (7-4) and install it in the round hole on the rope bracket (2-2) of the plug-in frame assembly, then pinch open the first loop spring hook (7-1) and install it in the rope bracket of the door panel, control the flip angle of the plug-in frame assembly to be between 80° and 85°, tie the safety rope (7-3) at the joint with the cable tie (7-2), thereby completing the fixation of the rope assembly (7); Step 2: Flip open the large pressure plate (5-1) of the assembled rotary folding filter device and insert 8mm filter cotton (5-6). Since the grille plate assembly (6) adopts the process of pressing the dead edge on all sides, a height difference of 2mm is formed between the area where the ventilation holes are opened and the dead edge, so that the 8mm filter cotton (5-6) can be compressed within a height range of 2mm. The edge pressing makes the filter cotton (5-6) more firmly exist in the clamping area between the grille plate assembly (6), the large pressure plate (5-1) and the left and right pressure plate assemblies; Step 3: Insert the rotating folding filter device (5) into the U-shaped opening of the insert frame assembly (2). When it reaches the area of ​​the limiting spring (2-5), it is blocked by the spring steel characteristics of the limiting spring (2-5), so that the rotating folding filter device (5) is blocked at the limiting spring (2-5). Use force to push it to the bottom so that the rotating folding filter device (5) can pass through. When passing through, the left and right pressure plate assemblies begin to contact the inclined surface (2-6) of the pressing slider (2-3), giving it a function of limiting and gradually pressing. Therefore, after the rotating folding filter device (5) is pushed to the bottom, under the action of the pressing slider (2-3) and the limiting spring (2-5), the bottom areas on both sides of the rotating folding filter device (5) are tightly pressed to ensure that the filter cotton (5-6) is not loose. Step 4: Lift the insert frame assembly (2) and fit it onto the air inlet cover assembly (1). The bosses (1-7) on the U-shaped top frame (1-4) in the air inlet cover assembly (1) extend into the pressing rectangular holes (5-21) on the left and right pressure plate assemblies and the upper end of the large pressure plate (5-1) of the rotary folding filter device (5) respectively. Finally, turn over the buckle (8), lock the buckle (8), and insert the anti-drop pin (9) so that the insert frame assembly (2) is completely combined with the air inlet cover assembly (1); The steps for replacing the filter cotton are: Step 5: Release the anti-drop pin (9), then release the buckle (8), and then flip the insert frame assembly (2). Under the action of the pull rope assembly (7), the opening angle of the insert frame assembly (2) is limited to between 80° and 85°. Then, pull the rotating folding filter device (5) and pull it out a part of the way past the area of ​​the limit spring (2-5). Then release your hand. Due to the characteristics of its spring steel, the limit spring (2-5) will press into the inside of the insert frame assembly (2), forming a stopper to block the rotating folding filter device (5). Step 6: Through the position distance of the stopper, the filter hinge assembly of the rotary folding filter device (5) is formed in the area that makes way for the bottom of the insert frame assembly (2). Take the reinforcing crossbars (5-15) of the left and right pressure plate assemblies, lift them up and then rotate the left and right pressure plate assemblies from the first position to the filter hinge assembly of the large pressure plate (5-1) until they are rotated to the second position. At this time, the crossbar (5-15) is just placed in the storage groove (5-11) of the first filter hinge body (5-9). Then, flip the large pressure plate (5-1) to form an open state. Replace the filter cotton (5-6) without pulling the rotary folding filter device (5) out of the insert frame assembly as a whole.

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