Anti-theft door with air filtering function

Abstract

An antitheft door with an air filtering function comprises an antitheft door body. The anti-theft door body comprises a door frame and a door body. The door body is provided with a window. A cover plate is hinged to the front side of the door body through hinges. And an air filtering structure is arranged in the window. The door body is further provided with a sliding groove, a containing cavity, a mounting cavity and a cavity. And a descending structure is arranged in the door body. The lifting structure comprises a worm, a shaft rod, a rotary knob, a worm gear, an annular lifting frame, two lead screws, two driven gears, two nut seats and two driving gears. And the air filtering structure comprises an annular mounting frame and two filter screens. Activated carbon is filled between the annular mounting frame and the two filter screens. According to the air purifier, air can be filtered, and the safety performance is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field related to entrance doors, in particular to an anti-theft door with an air filtering function. Background Art

[0002] At present, most of the anti-theft doors on the market only have the function of anti-theft, and their functionality is relatively simple. There are also a few anti-theft doors equipped with small windows that can be used for normal indoor ventilation, but this small window cannot filter the air, so it cannot change and improve the indoor air quality.

[0003] To this end, a utility model patent with authorization announcement number CN220504881U discloses an anti-theft door, including a door frame, a door body is movably mounted on the side wall of the door frame through hinges, slots are arranged on both side walls of the door body, and a stirring assembly is arranged on the bottom inner wall of the door body; the mesh frame in the utility model can filter large substances in the air to prevent them from entering the room, and at the same time use activated carbon for adsorption to improve the quality of indoor air.

[0004] However, in addition to facilitating ventilation, opening a small window on the entrance door also has another crucial function, which is to improve safety. Through the small window on the door, you can observe the situation outside the door more clearly without opening the door, or interact directly with strangers outside the door. For example, when signing for a courier, you can open the small window on the door to sign for the courier, avoiding the situation where criminals disguise themselves as deliverymen and trick users into opening the guard door to take items. When users open the guard door, criminals are likely to cause harm to users, resulting in threats to their safety.

[0005] However, the utility model fixes the mesh frame to the window through a fixing rod, and the mesh frame directly blocks the window, making it impossible for people inside the house to clearly observe the situation outside the door through the window, or interact with strangers outside the door. In order to achieve the function of filtering air, the utility model abandons the more important function of improving safety.

[0006] Therefore, the utility model proposes a technical solution to solve the problem that the air filter structure is fixed at the window, blocking the window, so that people inside the house cannot observe the situation outside the door through the window or interact with strangers outside the door. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an anti-theft door with an air filtering function, whose air filtering structure can be raised and lowered. When ventilation and air filtering are required, the air filtering structure blocks the window. When it is necessary to observe the situation outside the door or interact with strangers outside the door, the air filtering structure is moved away from the window, thereby achieving the technical effect of filtering the air without affecting the safety performance.

[0008] 1. The anti-theft door according to claim 1, wherein the air filter structure is provided in the window and the air filter structure is provided in the window. The left and right inner walls of the window are provided with slide grooves, and the interior of the door body is provided with a accommodating cavity, an installing cavity and a cavity. The top middle part of the accommodating cavity is communicated with the bottom inner wall of the window, and the left and right sides of the top of the accommodating cavity correspond to two slide grooves respectively, and are respectively communicated with the bottom groove walls of the two slide grooves, the accommodating cavity and the slide groove have the same width, the installing cavity is located directly below the accommodating cavity, and the cavity is located directly to the left of the installing cavity, and a lifting structure for driving the air filtering structure to move up and down is provided between the slide groove, the accommodating cavity, the installing cavity and the cavity, and the lifting structure comprises a worm, a shaft, an annular lifting frame and two screw rods, the two screw rods correspond to the two slide grooves respectively, and the top of the screw rod The top groove wall of the slide groove is rotatably connected with the top groove wall of the slide groove through a bearing, the bottom end of the screw rod is rotatably connected with the bottom cavity wall of the accommodating cavity through a bearing, and penetrates into the installation cavity and is fixed with a driven gear, the outside of the screw rod is sleeved with a nut seat that slides up and down along the groove wall of the slide groove and the cavity wall of the installation cavity in a threaded connection manner, the annular lifting frame is fixedly connected between the two nut seats, the length and height of the annular lifting frame are matched with the window, the width of the annular lifting frame is consistent with the nut seat, the height of the annular lifting frame is smaller than the accommodating cavity, the worm is rotatably connected between the front and rear cavity walls of the cavity through a bearing, the front end of the worm passes through the cavity and is fixed with a knob located on the front side of the door body, the shaft rod is rotatably connected between the left and right cavity walls of the installation cavity through a rotating shaft, the outer fixed sleeve of the shaft rod is provided with two driving gears located in the installation cavity, the two driving gears are respectively meshed with the two driven gears, and the right end of the shaft rod penetrates into the cavity and is fixed with a worm wheel meshed with the worm;

[0009] The air filtration structure includes an annular mounting frame and two filter screens. The annular mounting frame is inserted into the annular lifting frame in a matching manner and is detachably connected to the annular lifting frame. The two filter screens are respectively fixed to the front and rear sides of the annular mounting frame. A placement cavity is formed between the annular mounting frame and the two filter screens, and the placement cavity is filled with activated carbon.

[0010] By adopting the above technical solution, when it is necessary to ventilate and filter the air through the window, just rotate and open the cover. At this time, the annular lifting frame is located in the window, and the annular lifting frame matches the window, so that the annular lifting frame and the air filtering structure can completely cover the window to prevent air from flowing through the gap between the window and the annular lifting frame. Since the front and back sides of the air filtering structure are both filters, the air can flow smoothly. When the air circulates, the activated carbon placed in the cavity will absorb impurities in the air, thereby purifying the air. When it is necessary to observe the outside of the house through the window or interact with strangers outside the house, first rotate and open the cover, and then turn the knob clockwise. The knob drives the worm fixedly connected to it to rotate, and the worm drives the worm wheel meshed with it to rotate. The worm wheel drives the shaft fixedly connected to it to rotate. The shaft drives the driving gear fixedly connected to it to rotate. The driving gear drives the driven gear meshed with it to rotate. The driven gear drives the screw fixedly connected to it to rotate. The screw drives the nut seat to slide downward. The nut seat first slides downward along the slide groove, then slides into the accommodating cavity, and continues to slide downward along the accommodating cavity. The nut seat will drive the annular lifting frame to move downward. The annular lifting frame drives the air filter structure to move downward. Until the annular lifting frame is completely located in the accommodating chamber, at this time, the air filter structure is also located in the accommodating chamber. The window is no longer blocked, and the situation outside the house can be clearly observed through the window without opening the door body. Similarly, when the annular lifting frame needs to be raised again, the annular lifting frame and the air filter structure can be raised and blocked again by rotating the knob counterclockwise, and the self-locking effect between the worm gear and the worm, and the screw and the nut seat can ensure the stability of the annular lifting frame after it rises and blocks the window. The air filter structure of the utility model can be raised and lowered. When ventilation and air filtering are required, the air filter structure blocks the window. When the situation outside the door needs to be observed or interacted with strangers outside the door, the air filter structure descends into the accommodating chamber. It can filter the air without affecting the safety performance. And through the detachable connection between the annular mounting frame and the annular lifting frame, the air filter structure can be disassembled for replacement.

[0011] A further configuration of the utility model is that an outer side wall of the knob is provided with anti-slip patterns.

[0012] By adopting the above technical solution and setting the anti-slip texture, it is convenient for the staff to turn the knob more easily.

[0013] The utility model is further configured as follows: an opening is provided at the top of the annular installation frame, and a top cover is provided on the opening.

[0014] By adopting the above technical solution, after the annular installation frame is removed from the annular lifting frame and the top cover is opened, the activated carbon in the placement chamber can be replaced.

[0015] The utility model is further configured as follows: limit grooves extending horizontally front and back are provided on the inner side walls on both sides of the left and right sides of the annular lifting frame, the front end of the limit groove passes through the annular lifting frame, a circular guide rod extending horizontally front and back is fixed on the rear end groove wall of the limit groove, the external sliding sleeve of the circular guide rod is provided with a slide plate, a spring sleeved on the outside of the circular guide rod is fixedly connected between the slide plate and the rear end groove wall of the limit groove, the front end rotation sleeve of the circular guide rod is provided with a rotating bar, the rear side of the rotating bar is in contact with the front side of the annular lifting frame, the length of the rotating bar is less than the groove depth of the limit groove and greater than the groove width of the limit groove, and a limit block for slidingly inserting into the limit groove in a matching connection manner is fixed on the outer side wall of the annular mounting frame, and the limit block is provided with a through groove for the rotating bar to pass through.

[0016] By adopting the above technical solution, when the annular installation frame needs to be installed in the annular lifting frame, the rotating bar is first rotated to make the rotating bar horizontal. Then the limit block is slidably inserted into the limit groove. At this time, the rotating bar corresponds to the through groove, and the limit block can smoothly pass through the rotating bar and be set on the outside of the circular guide rod. After the limit block is inserted into the limit groove, it will press the slide plate, thereby driving the slide plate to move backward along the circular guide rod. The spring is compressed to form a rebound force toward the front side. When the front side of the limit block is level with the front side of the annular lifting frame, the rotating bar is rotated 90 degrees, the rotating bar is staggered with the through groove, and the two ends of the rotating bar are stuck on the front side of the annular lifting frame, thereby fixing the limit block in the limit groove, and thus completing the installation between the annular installation frame and the annular lifting frame. Similarly, when the annular installation frame needs to be removed from the annular lifting frame, the rotating bar is rotated to make it correspond to the through groove again, and the limit block automatically pops out of the limit groove under the action of the rebound force of the spring, thereby driving the annular installation frame to automatically pop out of the annular lifting frame.

[0017] The utility model is further configured as follows: an annular baffle is fixed to the rear side of the inner side wall of the annular lifting frame, at least two push-type spring locks are installed on the annular baffle, and a connector that cooperates with the push-type spring locks is fixed to the rear side of the annular mounting frame.

[0018] By adopting the above technical solution, when the annular installation frame needs to be installed in the annular lifting frame, the annular installation frame is directly inserted into the annular lifting frame until the push-type spring lock buckle is matched and connected with the connector. When the annular installation frame needs to be removed from the annular lifting frame, the annular installation frame is pressed downward, and the push-type spring lock buckle is automatically separated from the connector, and the annular installation frame is automatically ejected under the action of the push-type spring lock buckle.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] An anti-theft door with air filtering function. The air filtering structure of the utility model can be raised and lowered. When ventilation and air filtering are required, the air filtering structure blocks the window. When the situation outside the door needs to be observed or interacted with strangers outside the door, the air filtering structure is lowered into the accommodating cavity. The air can be filtered without affecting the safety performance. And through the detachable connection between the annular mounting frame and the annular lifting frame, the air filtering structure can be disassembled for replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of embodiment 1;

[0022] Figure 2 It is a front view of the door body in the first embodiment;

[0023] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0024] Figure 4 is a cross-sectional view of the detachable connecting assembly in the first embodiment from the side;

[0025] Figure 5 It is a cross-sectional view of the annular lifting frame and the air filtering structure in the second embodiment when viewed from above.

[0026] Figure numerals: 1. door frame; 2. door body; 3. window; 4. cover plate; 5. slide groove; 6. accommodating chamber; 7. mounting chamber; 8. cavity; 9. worm; 10. shaft; 11. annular lifting frame; 12. screw; 13. driven gear; 14. knob; 15. driving gear; 16. worm wheel; 17. annular mounting frame; 18. filter screen; 19. activated carbon; 20. opening; 21. top cover; 22. limit groove; 23. circular guide rod; 24. slide plate; 25. spring; 26. rotating bar; 27. limit block; 28. through groove; 29. ​​push-type spring lock; 30. connector; 31. annular baffle. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1:

[0029] An anti-theft door with air filtering function, such as Figure 1-Figure 4As shown, the anti-theft door comprises a main body. The anti-theft door comprises a door frame 1 and a door body 2. A window 3 is provided on the door body 2. A cover plate 4 for shielding the window 3 is hingedly connected to the front side of the door body 2 through a hinge. An air filter structure is provided in the window 3.

[0030] Slide grooves 5 are provided on the inner side walls on both sides of the window 3. The door body 2 is provided with a receiving cavity 6, an installation cavity 7 and a cavity 8. The middle part of the top of the receiving cavity 6 is communicated with the inner side wall of the bottom end of the window 3. The left and right sides of the top of the receiving cavity 6 correspond to two slide grooves 5, respectively, and are communicated with the bottom groove walls of the two slide grooves 5. The width of the receiving cavity 6 is the same as that of the slide groove 5. The installation cavity 7 is located directly below the receiving cavity 6. The cavity 8 is located directly to the left of the installation cavity 7.

[0031] A lifting structure for driving the air filter structure to move up and down is provided between the chute 5, the accommodating chamber 6, the installation chamber 7 and the cavity 8. The lifting structure includes a worm 9, a shaft 10, an annular lifting frame 11 and two screws 12. The two screws 12 correspond to the two chute 5 respectively. The top of the screw 12 is rotatably connected to the top groove wall of the chute 5 through a bearing. The bottom of the screw 12 is rotatably connected to the bottom cavity wall of the accommodating chamber 6 through a bearing, and penetrates into the installation chamber 7 and is fixed with a driven gear 13. The outside of the screw 12 is provided with a nut seat that slides up and down along the groove wall of the chute 5 and the cavity wall of the installation chamber 7 in a threaded connection. The annular lifting frame 11 is fixedly connected between the two nut seats. The length and height of the annular lifting frame 11 are matched with the window 3. The width of the annular lifting frame 11 is consistent with the nut seat. The height of the annular lifting frame 11 is smaller than the accommodating chamber 6. The worm 9 is rotatably connected between the front and rear cavity walls of the cavity 8 through a bearing. The front end of the worm 9 passes through the cavity 8 and is fixed with a knob 14 located on the front side of the door body 2. The outer wall of the knob 14 is provided with anti-skid patterns. The provision of the anti-skid patterns makes it easier for the staff to turn the knob 14. The shaft 10 is rotatably connected between the left and right side walls of the installation cavity 7 through a rotating shaft. The outer fixed sleeve of the shaft 10 is provided with two driving gears 15 located in the installation cavity 7. The two driving gears 15 are respectively meshed with the two driven gears 13. The right end of the shaft 10 passes through the cavity 8 and is fixed with a worm wheel 16 meshed with the worm 9.

[0032] The air filtration structure includes an annular mounting frame 17 and two filter screens 18. The annular mounting frame 17 is inserted into the annular lifting frame 11 in a matching connection manner. A detachable connection structure is provided between the annular mounting frame 17 and the annular lifting frame 11. The two filter screens 18 are respectively fixed to the front and rear sides of the annular mounting frame 17. A placement cavity is formed between the annular mounting frame 17 and the two filter screens 18. The placement cavity is filled with activated carbon 19. An opening 20 is provided at the top of the annular mounting frame 17, and a top cover 21 is provided at the opening 20.

[0033] The detachable connection structure is divided into two groups of detachable connection components that are symmetrically arranged on the left and right. The detachable connection components include a limit groove 22, a circular guide rod 23, a slide plate 24, a spring 25, a rotating bar 26, a limit block 27 and a through groove 28. The limit groove 22 is provided on the inner side wall of the annular lifting frame 11. The limit groove 22 extends horizontally forward and backward and its front end penetrates the annular lifting frame 11. The rear end of the circular guide rod 23 is fixed to the rear end groove wall of the limit groove 22. The rotating bar 26 is sleeved on the front end of the circular guide rod 23 and is located outside the limit groove 22. The rear side of the rotating bar 26 fits the front side of the annular lifting frame 11. The length of the rotating bar 26 is less than the groove depth of the limit groove 22 and greater than the groove width of the limit groove 22. The slide plate 24 is slidably sleeved on the outside of the circular guide rod 23 and is located in the limit groove 22. The spring 25 is fixedly connected between the slide plate 24 and the rear end groove wall of the limit groove 22 and is sleeved on the outside of the circular guide rod 23. The stopper 27 is fixed on the outer side wall of the annular mounting frame 17 and is slidably inserted into the stopper groove 22 in a matching manner. A through groove 28 is formed on the stopper 27 and allows the rotating bar 26 to pass through.

[0034] Working principle: When it is necessary to ventilate and filter the air through the window 3, just rotate and open the cover plate 4. At this time, the annular lifting frame 11 is located in the window 3, and the annular lifting frame 11 matches the window 3, so that the annular lifting frame 11 and the air filtering structure can completely cover the window 3, and prevent the air from flowing through the gap between the window 3 and the annular lifting frame 11. Since the front and back sides of the air filtering structure are both filter screens 18, the air can flow smoothly. When the air circulates, the activated carbon 19 placed in the cavity will absorb impurities in the air, thereby purifying the air.

[0035] When it is necessary to observe the situation outside the house through the window 3 or interact with strangers outside the house, first rotate the cover plate 4 to open it, and then turn the knob 14 clockwise. The knob 14 drives the worm 9 fixedly connected to it to rotate, and the worm 9 drives the worm wheel 16 meshing with it to rotate. The worm wheel 16 drives the shaft 10 fixedly connected to it to rotate. The shaft 10 drives the driving gear 15 fixedly connected to it to rotate. The driving gear 15 drives the driven gear 13 meshing with it to rotate. The driven gear 13 drives the screw rod 12 fixedly connected to it to rotate. The screw rod 12 drives the nut seat to slide downward. The nut seat first slides downward along the slide groove 5, then slides into the accommodating chamber 6, and continues to slide downward along the accommodating chamber 6. The nut seat will drive the annular lifting frame 11 to move downward. The annular lifting frame 11 drives the air filter structure to move downward. Until the annular lifting frame 11 is completely located in the accommodating chamber 6, at this time, the air filter structure is also located in the accommodating chamber 6. The window 3 is no longer blocked, and the user can clearly observe the outside of the house or interact with strangers outside through the window 3 without opening the door body 2. Similarly, when the annular lifting frame 11 needs to be raised again, the knob 14 can be rotated counterclockwise to raise the annular lifting frame 11 and the air filter structure and block the window 3 again. In addition, the self-locking effect between the worm wheel 16 and the worm 9 and the screw 12 and the nut seat can ensure the stability of the annular lifting frame 11 after it is raised and blocks the window 3.

[0036] When the activated carbon 19 needs to be replaced, the rotating bar 26 is rotated so that the rotating bar 26 is in a horizontal state, and the rotating bar 26 corresponds to the through slot 28. Under the action of the rebound force of the spring 25, the limit block 27 automatically pops out of the limit slot 22, thereby driving the annular installation frame 17 to automatically pop out of the annular lifting frame 11. It is worth noting that the rebound force of the spring 25 is not enough to support the annular installation frame 17 to be completely ejected from the annular lifting frame 11. After the front end of the annular installation frame 17 is ejected from the annular lifting frame 11, the user can pinch the annular installation frame 17 by hand to pull it out of the annular lifting frame 11. After the annular installation frame 17 is removed from the annular lifting frame 11, the top cover 21 is opened, and the activated carbon 19 in the placement chamber can be replaced. After filling the new activated carbon 19, the top cover 21 is closed. Then the limit block 27 is slid into the limit slot 22. At this time, the rotating bar 26 corresponds to the through slot 28, and the limit block 27 can smoothly pass through the rotating bar 26 and be sleeved on the outside of the circular guide rod 23. After the limit block 27 is inserted into the limit groove 22, it presses the slide plate 24, thereby driving the slide plate 24 to move backward along the circular guide rod 23. The spring 25 is compressed to form a rebound force toward the front side. When the front side of the limit block 27 is flush with the front side of the annular lifting frame 11, the rotating bar 26 is rotated 90 degrees to make the rotating bar 26 vertical. The rotating bar 26 is staggered with the through groove 28, and the two ends of the rotating bar 26 are stuck on the front side of the annular lifting frame 11, thereby fixing the limit block 27 in the limit groove 22, and the installation between the annular installation frame 17 and the annular lifting frame 11 is completed.

[0037] The air filter structure of the utility model can be raised and lowered. When ventilation and filtering air are required, the air filter structure blocks the window 3. When observing the situation outside the door or interacting with strangers outside the door, the air filter structure is lowered into the accommodating chamber 6. The air can be filtered without affecting the safety performance. And through the detachable connection between the annular mounting frame 17 and the annular lifting frame 11, the air filter structure can be disassembled for replacement.

[0038] Embodiment 2:

[0039] The difference from the first embodiment is that the detachable connection assembly no longer includes the limiting groove 22, the circular guide rod 23, the slide plate 24, the spring 25, the rotating bar 26, the limiting block 27 and the through groove 28. Figure 5 As shown, it includes a push-type spring lock 29 and a connector 30. An annular baffle 31 is fixed to the rear side of the inner side wall of the annular lifting frame 11. The push-type spring lock 29 is installed on the front side wall of the annular baffle 31. The connector 30 is installed on the rear side wall of the annular mounting frame 17 and corresponds to the push-type spring lock 29. The push-type spring lock 29 and the connector 30 connected thereto are mature existing technologies. In this embodiment, a door lock switch with model PR-01 can be used.

[0040] When the annular installation frame 17 needs to be installed in the annular lifting frame 11, the annular installation frame 17 is directly inserted into the annular lifting frame 11 until the push-type spring lock buckle 29 is matched and connected with the connector 30. When the annular installation frame 17 needs to be removed from the annular lifting frame 11, the annular installation frame 17 is pressed downward, and the push-type spring lock buckle 29 is automatically separated from the connector 30, and the annular installation frame 17 is automatically ejected under the action of the push-type spring lock buckle 29.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An anti-theft door with an air filtering function, comprising an anti-theft door body, the anti-theft door body comprising a door frame (1) and a door body (2), a window (3) being provided on the door body (2), a cover plate (4) for shielding the window (3) being hingedly connected to the front side of the door body (2) through a hinge, an air filtering structure being provided in the window (3), characterized in that: The left and right inner walls of the window (3) are provided with slide grooves (5); the interior of the door body (2) is provided with a receiving cavity (6), an installation cavity (7) and a cavity (8); the middle portion of the top end of the receiving cavity (6) is communicated with the inner wall of the bottom end of the window (3); the left and right sides of the top end of the receiving cavity (6) correspond to two slide grooves (5) respectively, and are communicated with the bottom groove walls of the two slide grooves (5) respectively; the widths of the receiving cavity (6) and the slide groove (5) are consistent; the installation cavity (7) is located directly below the receiving cavity (6); and the cavity (8) is located above the installation cavity (7). On the left side of the cavity (7), a lifting structure for driving the air filtering structure to move up and down is arranged between the slide groove (5), the accommodating cavity (6), the installation cavity (7) and the cavity (8), the lifting structure comprises a worm (9), a shaft (10), an annular lifting frame (11) and two screw rods (12), the two screw rods (12) respectively corresponding to the two slide grooves (5), the top end of the screw rod (12) is rotatably connected to the top groove wall of the slide groove (5) through a bearing, the bottom end of the screw rod (12) is rotatably connected to the bottom cavity wall of the accommodating cavity (6) through a bearing, and The driven gear (13) is inserted into the installation cavity (7) and fixed thereon; the outer portion of the screw rod (12) is sleeved with a nut seat that slides up and down along the groove wall of the slide groove (5) and the cavity wall of the installation cavity (7) in a threaded connection manner; the annular lifting frame (11) is fixedly connected between the two nut seats; the length and height of the annular lifting frame (11) are matched with the window (3); the width of the annular lifting frame (11) is consistent with the nut seat; the height of the annular lifting frame (11) is smaller than the accommodating cavity (6); the worm (9) is rotatably connected to the cavity through a bearing. The front end of the worm (9) passes through the cavity (8) and is fixed with a knob (14) located on the front side of the door body (2). The shaft (10) is rotatably connected to the left and right cavity walls of the installation cavity (7) through a rotating shaft. The outer fixed sleeve of the shaft (10) is provided with two driving gears (15) located in the installation cavity (7). The two driving gears (15) are respectively meshed with two driven gears (13). The right end of the shaft (10) passes through the cavity (8) and is fixed with a worm wheel (16) meshed with the worm (9). The air filtering structure comprises an annular mounting frame (17) and two filter screens (18); the annular mounting frame (17) is inserted into the annular lifting frame (11) in a matching manner and is detachably connected to the annular lifting frame (11); the two filter screens (18) are respectively fixed to the front and rear sides of the annular mounting frame (17); a placement cavity is formed between the annular mounting frame (17) and the two filter screens (18); and the placement cavity is filled with activated carbon (19).

2. The anti-theft door with air filtering function according to claim 1, characterized in that: The outer side wall of the knob (14) is provided with anti-slip patterns.

3. The anti-theft door with air filtering function according to claim 1, characterized in that: The top end of the annular installation frame (17) is provided with an opening (20), and the opening (20) is covered with a top cover (21).

4. The anti-theft door with air filtering function according to claim 1, characterized in that: The inner side walls on both sides of the annular lifting frame (11) are provided with limit grooves (22) extending transversely to the front and rear. The front end of the limit groove (22) penetrates the annular lifting frame (11). A circular guide rod (23) extending transversely to the front and rear is fixed on the rear end groove wall of the limit groove (22). A sliding plate (24) is provided on the outside of the circular guide rod (23). A spring (25) sleeved on the outside of the circular guide rod (23) is fixedly connected between the sliding plate (24) and the rear end groove wall of the limit groove (22). The front end of the circular guide rod (23) is rotatably sleeved with a rotating bar (26), the rear side of the rotating bar (26) is in contact with the front side of the annular lifting frame (11), the length of the rotating bar (26) is less than the groove depth of the limiting groove (22) and greater than the groove width of the limiting groove (22), and a limiting block (27) for slidingly inserting into the limiting groove (22) in a matching connection manner is fixed on the outer side wall of the annular mounting frame (17), and a through groove (28) for the rotating bar (26) to pass through is opened on the limiting block (27).

5. The anti-theft door with air filtering function according to claim 1, characterized in that: An annular baffle (31) is fixed to the rear side of the inner side wall of the annular lifting frame (11), and at least two push-type spring lock buckles (29) are installed on the annular baffle (31). A connector (30) that cooperates with the push-type spring lock buckles (29) is fixed to the rear side of the annular installation frame (17).

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