A rapid lift door

Abstract

The utility model discloses a kind of fast lift doors, comprising: door frame, two columns of door frame, two columns are equipped with guide slot, sealing brush is equipped on the two sides inner wall of guide slot along its width direction;Driving device, it is set in the top of door frame;Soft curtain door, the upper end of soft curtain door is stretched out from the outside of guide slot and is connected with the output end of driving device, driving device is used to drive the upper end rotation of soft curtain door, soft curtain door includes the alternately arranged multiple door curtain cloth and connecting mechanism along vertical direction, door curtain cloth includes thermal insulation layer and the waterproof coating of setting in the two sides of thermal insulation layer, connecting mechanism extends along first direction and with adjacent two door curtain cloth detachably connected;Protective air bag, it is set in the bottom of soft curtain door, the size of protective air bag in first direction is not less than the interval between two columns.The utility model can improve the sealing effect of lift door, improve the stability of workshop temperature and humidity.

Description

Technical Field

[0001] This utility model relates to the field of lifting door technology, and in particular to a fast lifting door. Background Technology

[0002] In the modern cigarette manufacturing and storage environment, the blending, flavoring, tobacco storage, and temperature and humidity control in the rolling and packaging sections are crucial for tobacco quality and production process stability. Fluctuations in the temperature and humidity of the production environment can lead to product deterioration, process failure, or equipment malfunction, directly impacting production efficiency and product quality.

[0003] Traditional methods for controlling temperature and humidity in workshops typically rely on equipment such as air conditioning systems, humidifiers, or dehumidifiers. However, these devices often cannot completely solve the problem of temperature and humidity fluctuations when workshop doors are frequently opened. Especially when the workshop frequently exchanges with the external environment (logistics channels, loading and unloading areas, equipment maintenance, process inspections, etc.), the wind pressure generated by opening heavy fire doors and the failure to close them in time can cause rapid changes in temperature and humidity inside the workshop, thereby affecting the overall environmental stability of the workshop.

[0004] In existing technologies, a high-speed lifting door is installed at the entrance of the workshop to reduce the impact of the external environment on the workshop by shortening the opening time of the lifting door. However, its design usually lacks an efficient sealing structure and cannot effectively isolate the external temperature and humidity.

[0005] Therefore, there is an urgent need for a lifting door system that can effectively ensure the stability of temperature and humidity in the workshop. Utility Model Content

[0006] The purpose of this invention is to solve the problem of poor sealing performance of existing lifting doors. This invention provides a fast-lifting door that can improve the sealing effect of the lifting door, thereby improving the stability of temperature and humidity in the workshop.

[0007] To solve the above-mentioned technical problems, the present invention provides a quick-lifting door, comprising:

[0008] The door frame includes two columns spaced apart along a first direction. A guide groove is provided on one side of each column that is opposite to the other. The extension direction of the guide groove and the column is perpendicular to the first direction. Sealing brushes are provided on the inner walls of both sides of the guide groove along its width direction.

[0009] The drive unit is located above the door frame;

[0010] The soft curtain door has two sides inserted into two guide grooves and in contact with sealing brushes. The upper end of the soft curtain door extends out of the guide grooves and is connected to the output end of the drive device. The drive device is used to drive the upper end of the soft curtain door to rotate. The soft curtain door includes multiple door curtain fabrics and connecting mechanisms arranged alternately in the vertical direction. The door curtain fabrics include an insulation layer and a waterproof coating disposed on both sides of the insulation layer. The connecting mechanism extends in a first direction and is detachably connected to two adjacent door curtain fabrics.

[0011] The protective airbag is installed at the bottom of the soft curtain door, and the size of the protective airbag in the first direction is not less than the distance between the two uprights.

[0012] According to another specific embodiment of the present invention, the connecting mechanism includes:

[0013] A connecting block has a first gap at its upper end and a second gap at its lower end. The upper part of the connecting block has a first through hole that communicates with the first gap, and the lower part of the connecting block has a second through hole that communicates with the second gap. The first gap, the second gap, the first through hole, and the second through hole all extend along a first direction.

[0014] The first rod is located inside the first through hole, with both ends of the first rod extending outside the first through hole. The bottom of the door curtain fabric located above the connecting block passes through the first gap and then wraps around the first rod.

[0015] The second rod is located inside the second through hole, with both ends of the second rod extending outside the second through hole. The top of the door curtain fabric located below the connecting block passes through the second gap and then wraps around the second rod.

[0016] Multiple first fixing members are respectively fitted onto the two ends of the first rod and the second rod.

[0017] According to another specific embodiment of the present invention, both ends of the first rod and the second rod are provided with threaded portions, and the first fixing member is a nut, which is threadedly connected to the threaded portion.

[0018] According to another specific embodiment of the present invention, a counterweight plate is provided at the bottom of the soft curtain door, the upper part of the counterweight plate is detachably connected to the bottom of the soft curtain door, and the lower part of the counterweight plate is detachably connected to the protective airbag.

[0019] According to another specific embodiment of this utility model, the counterweight plate includes:

[0020] The counterweight has a third gap at its upper end and a fourth gap at its lower end. The upper part of the counterweight has a third through hole that communicates with the third gap, and the lower part of the counterweight has a fourth through hole that communicates with the fourth gap. The third gap, the fourth gap, the third through hole, and the fourth through hole all extend along the first direction.

[0021] The third rod is located inside the third through hole, with both ends of the third rod extending outside the third through hole. The bottom of the door curtain above the counterweight passes through the third gap and is wrapped around the third rod.

[0022] The fourth rod is located inside the fourth through hole, with both ends of the fourth rod extending outside the fourth through hole. The upper end of the protective airbag passes through the fourth gap and is wrapped around the fourth rod.

[0023] Four second fasteners are respectively fitted onto the two ends of the third and fourth rods.

[0024] According to another specific embodiment of the present invention, it also includes a control unit. A pair of photoelectric detection switches are provided below the two columns. The photoelectric detection switches are electrically connected to the control unit and are used to detect whether an object passes through the lifting door after the soft curtain door is raised.

[0025] According to another specific embodiment of the present invention, the driving device includes a motor and a drum, with the upper end of the top curtain fabric wound around the drum, and the output end of the motor connected to one end of the drum.

[0026] According to another specific embodiment of the present invention, a stroke positioner is provided on the motor and electrically connected to the control unit for detecting the number of rotations of the motor.

[0027] According to another specific embodiment of this utility model, the insulation layer is made of polyester fiber material, and the waterproof coating is made of polyvinyl chloride material.

[0028] According to another specific embodiment of the present invention, orange warning strips are provided around the perimeter of the door curtain fabric.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The high-speed lifting door provided by this utility model ensures a tight seal between the sides of the soft curtain door and the door frame by installing sealing brushes on the inner walls of both sides of the guide groove and ensuring that the sealing brushes are in contact with the soft curtain door. A protective airbag is installed at the bottom of the soft curtain door, and the size of the protective airbag in the first direction is at least larger than the distance between the two door frames, thereby creating a tight seal between the soft curtain door and the ground and improving the airtightness between the soft curtain door and the ground. In addition, the door curtain fabric includes an insulation layer and a waterproof coating on both sides of the insulation layer, which effectively isolates external temperature and humidity, maintains good sealing, and facilitates cleaning of the door curtain fabric. In summary, the high-speed lifting door provided by this utility model can improve the overall sealing performance of the door, thereby enhancing the stability of temperature and humidity within the workshop. Attached Figure Description

[0031] Figure 1This is a front view of a fast-lifting door provided in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 Sectional view along line AA in the middle;

[0033] Figure 3 for Figure 1 BB-direction sectional view.

[0034] Explanation of icon numbers:

[0035] 1. Door frame; 11. Post; 12. Guide groove; 2. Drive device; 21. Motor cover; 3. Soft curtain door; 31. Door curtain fabric; 311. Insulation layer; 312. Waterproof coating; 32. Connecting mechanism; 321. Connecting block; 3211. First gap; 3212. Second gap; 3213. First through hole; 3214. Second through hole; 322. First rod; 323. Second rod; 33. Counterweight plate; 331. Counterweight block; 3311. Third gap; 3312. Fourth gap; 3313. Third through hole; 3314. Fourth through hole; 3215. Recess; 332. Third rod; 333. Fourth rod; 4. Protective airbag; 5. Photoelectric detection switch; 51. Transmitter; 52. Receiver. Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0037] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0039] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0040] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0042] like Figure 1 As shown, Figure 1 This is a front view of a high-speed lifting door according to an embodiment of the present invention. In this embodiment, the high-speed lifting door includes:

[0043] Door frame 1, door frame 1 includes a first direction (e.g. Figure 1 Two columns 11 are spaced apart (as shown in the x-direction), and guide grooves 12 are provided on the opposite sides of the two columns 11 (as shown in the x-direction). Figure 2 As shown), the extension directions of the guide groove 12 and the column 11 (as shown) Figure 1 The guide groove 12 (as shown in the y-direction) is perpendicular to the first direction, and the guide groove 12 is perpendicular to its width direction (as shown in the y-direction). Figure 2 Sealing brushes (not shown in the figure) are provided on both inner walls of the z-direction.

[0044] Drive unit 2 is located above door frame 1;

[0045] The soft curtain door 3 has two sides inserted into two guide grooves 12 and in contact with sealing brushes. The upper end of the soft curtain door 3 extends out of the guide grooves 12 and is connected to the output end of the drive device 2. The drive device 2 drives the upper end of the soft curtain door 3 to rotate, causing it to curl or release, thereby controlling the opening and closing of the soft curtain door 3. The soft curtain door 3 includes multiple curtain fabrics 31 arranged alternately in a vertical direction and a connecting mechanism 32. Each curtain fabric 31 includes an insulation layer 311 and a waterproof coating 312 disposed on both sides of the insulation layer 311. Figure 2 and Figure 3 Only a portion of the waterproof coating 312 is shown as an example; the connecting mechanism 32 extends along the first direction and is detachably connected to two adjacent door curtain fabrics 31.

[0046] The protective airbag 4 is located at the bottom of the soft curtain door 3, and the size of the protective airbag 4 in the first direction is not less than the distance between the two uprights 11.

[0047] This technical solution involves installing sealing brushes on the inner walls of both sides of the guide groove 12, ensuring contact between the sealing brushes and the flexible curtain door 3, thus guaranteeing the seal between the flexible curtain door 3 and the door frame 1. A protective airbag 4 is installed at the bottom of the flexible curtain door 3, with its dimension in the first direction being at least greater than the distance between the two door frames 1. This ensures a tight seal between the flexible curtain door 3 and the ground, improving the seal between the flexible curtain door 3 and the ground. Furthermore, the curtain fabric 31 includes an insulation layer 311 and a waterproof coating 312 on both sides of the insulation layer 311, enhancing the isolation effect from external temperature and humidity, maintaining good sealing, and facilitating cleaning of the curtain fabric 31. In summary, the quick-lifting door provided by this invention improves the overall sealing of the door, thereby enhancing the stability of temperature and humidity within the workshop. Additionally, the sealing brushes on the door frame 1 and the protective airbag 4 at the bottom of the flexible curtain door 3 also serve a dustproof function.

[0048] Specifically, when the drive unit 2 runs in the forward direction and drives the soft curtain door 3 to rise, the soft curtain door 3 rises along the guide groove 12, thereby opening the lifting door; when the soft curtain door 3 is to be lowered, the drive unit 2 runs in the reverse direction, and the soft curtain door 3 can descend along the guide groove 12 by its own weight, thereby closing the lifting door.

[0049] Furthermore, such as Figure 2 As shown, in this embodiment, the connecting mechanism 32 includes:

[0050] The connecting block 321 has a first gap 3211 at its upper end and a second gap 3212 at its lower end. The upper part of the connecting block 321 has a first through hole 3213 that communicates with the first gap 3211, and the lower part of the connecting block 321 has a second through hole 3214 that communicates with the second gap 3212. The first gap 3211, the second gap 3212, the first through hole 3213, and the second through hole 3214 all extend along a first direction.

[0051] The first rod 322 is located inside the first through hole 3213. Both ends of the first rod 322 extend out of the first through hole 3213. The bottom of the door curtain fabric 31 located above the connecting block 321 passes through the first gap 3211 and then wraps around the first rod 322.

[0052] The second rod 323 is located inside the second through hole 3214. Both ends of the second rod 323 extend out of the second through hole 3214. The top of the door curtain 31 located below the connecting block 321 passes through the second gap 3212 and then wraps around the second rod 323.

[0053] Multiple first fasteners (not shown in the figure) are respectively sleeved on both ends of the first rod 322 and the second rod 323.

[0054] Using this technical solution, the soft curtain door 3 includes multiple curtain fabrics 31, which are detachably connected by a connecting mechanism 32. When one of the curtain fabrics 31 is damaged, it is easy to replace the damaged curtain fabric 31, thus saving costs.

[0055] Specifically, the connecting block 321 is made of aluminum alloy to increase the counterweight of the soft curtain door 3. The connecting block 321 is rectangular, and its length matches the width of the guide groove 12 in the width direction. In the middle of the connecting block 321, two inwardly recessed portions 3215 are provided on its two outer surfaces to reduce damage to the sealing brush and reduce resistance to the rising and falling of the soft curtain door 3.

[0056] In this embodiment, the first rod 322 and the second rod 323 are round rods, and their outer diameters are slightly smaller than the inner diameters of the first through hole 3213 and the second through hole 3214, respectively, so that the rods can be inserted into the through holes after the curtain fabric 31 is rolled up on them. During installation, the lower end of the curtain fabric 31, located above the connecting block 321, is wrapped around the first rod 322 and then sewn to fix the curtain fabric 31 to the first rod 322. Then, the first rod 322 is inserted into the first through hole 3213, and the curtain fabric 31 is inserted into the first gap 3211 along the first gap 3211. The first rod 322 moves along the first through hole 3213 until both ends of the first rod 322 extend a certain distance outside the first through hole 3213. Subsequently, first fixing members are respectively fitted onto both ends of the first rod 322. The first fixing members can prevent the first rod 322 from coming out of the connecting block 321, thereby installing the door curtain fabric 31 onto the upper part of the connecting block 321. In the same manner as described above, the door curtain fabric 31 below the connecting block 321 is installed onto the lower part of the connecting block 321.

[0057] Furthermore, both ends of the first rod 322 and the second rod 323 are provided with threaded portions, that is, both ends of the first rod 322 and the second rod 323 are provided with external threads. The first fixing member is a nut, which is threadedly connected to the threaded portion.

[0058] By employing this technical solution, the two ends of the first rod 322 and the second rod 323 are locked with nuts, preventing the rods from moving left or right in the first direction. Optionally, a washer is provided between the nut and the connecting block 321.

[0059] Furthermore, the bottom of the soft curtain door 3 is provided with a counterweight plate 33, the upper part of the counterweight plate 33 is detachably connected to the bottom of the soft curtain door 3, and the lower part of the counterweight plate 33 is detachably connected to the protective airbag 4.

[0060] By adopting this technical solution, a counterweight plate 33 is set at the bottom of the soft curtain door 3, thereby increasing the weight of the lower part of the soft curtain door 3, so that the soft curtain door 3 can descend by its own weight.

[0061] Furthermore, such as Figure 3 As shown, in this embodiment, the counterweight plate 33 includes:

[0062] The counterweight 331 has a third gap 3311 at its upper end and a fourth gap 3312 at its lower end. The upper part of the counterweight 331 has a third through hole 3313 that communicates with the third gap 3311, and the lower part of the counterweight 331 has a fourth through hole 3314 that communicates with the fourth gap 3312. The third gap 3311, the fourth gap 3312, the third through hole 3313 and the fourth through hole 3314 all extend along the first direction.

[0063] The third rod 332 is located inside the third through hole 3313. Both ends of the third rod 332 extend out of the third through hole 3313. The bottom of the door curtain 31 located above the counterweight 331 passes through the third gap 3311 and is wrapped around the third rod 332.

[0064] The fourth rod 333 is located inside the fourth through hole 3314. Both ends of the fourth rod 333 extend out of the fourth through hole 3314. The upper end of the protective airbag 4 passes through the fourth gap 3312 and is wrapped around the fourth rod 333.

[0065] Four second fasteners are respectively fitted onto the two ends of the third member 332 and the fourth member 333.

[0066] Optionally, the counterweight 331 is made of aluminum alloy. The counterweight 331 is rectangular and has chamfers at its four corners to reduce the resistance of the counterweight plate 33 during the rising and falling process.

[0067] In this embodiment, the connection method between the door curtain 31 above the counterweight 331 and the counterweight 331 is the same as the connection method between the door curtain 31 and the connecting block 321, and will not be described again here.

[0068] The protective airbag 4 is made of rubber, which gives it a certain degree of elasticity to ensure the seal between the soft curtain door 3 and the ground. Specifically, one end of a piece of rubber material is folded in half and pasted onto the lower part of the other end, and the extended end is wrapped around the fourth rod 333 and installed in the fourth through hole 3314 of the counterweight block 331 through the fourth rod 333.

[0069] Optionally, the longitudinal center lines of the first gap 3211, the second gap 3212, the first through hole 3213 and the second through hole 3214 on the connecting block 321 are all located in the same plane as the center lines of the third gap 3311, the fourth gap 3312, the third through hole 3313 and the fourth through hole 3314 on the counterweight block 331 along the z-direction.

[0070] Furthermore, it also includes a control unit. A pair of photoelectric detection switches 5 are provided below the two columns 11. The photoelectric detection switches 5 are electrically connected to the control unit and are used to detect whether an object passes through the lifting door after the soft curtain door 3 is raised.

[0071] Specifically, the photoelectric detection switch 5 includes a transmitter 51 and a receiver 52, which are respectively mounted on two columns 11. The photoelectric detection switch 5 is used to detect whether there is a person or object standing under the door. If a person or object is detected, the control unit controls the drive device 2 to stop running, so that the soft curtain door 3 stops falling, so as to avoid damage to the person or object.

[0072] Furthermore, the drive device 2 includes a motor and a drum, with the upper end of the top curtain fabric 31 wound around the drum, and the output end of the motor connected to one end of the drum.

[0073] Specifically, in this embodiment, a motor cover 21 is provided on the outside of the drive device 2, and the motor and the roller are housed inside the motor cover 21, which serves to prevent dust and provide safety protection. The motor drives the roller to rotate, thereby winding the soft curtain door 3 onto the roller, which in turn causes the soft curtain door 3 to rise upward.

[0074] Furthermore, the motor is equipped with a stroke positioner, which is electrically connected to the control unit and is used to detect the number of rotations of the motor.

[0075] Specifically, the travel positioner uses a rotary pulse counter. The travel positioner is mounted on the motor's output shaft to monitor the motor's rotation count in real time. Both the travel positioner and the motor are electrically connected to the control unit. The travel positioner sends the detected motor rotation count to the control unit. When the rotation count reaches a predetermined value, the control unit stops the motor. This allows for accurate positioning of the flexible curtain door 3.

[0076] Furthermore, the insulation layer 311 is made of polyester fiber material, and the waterproof coating 312 is made of polyvinyl chloride material.

[0077] Using this technical solution, the insulation layer 311 features high strength, high wear resistance, heat resistance, water resistance, and corrosion resistance. Covering both sides of the insulation layer 311 with a polyvinyl chloride waterproof coating 312 provides excellent waterproof and moisture-proof performance, effectively preventing moisture penetration, improving the stability of temperature and humidity inside the workshop, and facilitating the cleaning of the door curtain fabric 31.

[0078] Optionally, the curtain fabric 31 can be made of transparent material. This allows for easy observation of the situation inside and outside the door.

[0079] Furthermore, orange warning strips are provided around the perimeter of the door curtain 31.

[0080] This technical solution is distinctive and can effectively identify the soft curtain door 3.

[0081] According to the quick-lifting door provided by this utility model, a sealing brush is set on the door frame and a protective airbag is set at the bottom of the soft curtain door. The door curtain fabric adopts a structure of waterproof coating, heat insulation layer and waterproof coating, which can improve the overall sealing performance of the door, ensure the stability of temperature and humidity in the workshop, and also play a role in dust prevention.

[0082] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A high-speed lifting door, characterized in that, include: A door frame (1) includes two columns (11) spaced apart along a first direction. A guide groove (12) is provided on one side of each column (11) facing each other. The extension directions of the guide groove (12) and the column (11) are both perpendicular to the first direction. A sealing brush is provided on the inner walls of both sides of the guide groove (12) along its width direction. A drive unit (2) is disposed above the door frame (1); A soft curtain door (3) is inserted into two guide grooves (12) on both sides and in contact with the sealing brush. The upper end of the soft curtain door (3) extends out of the guide groove (12) and is connected to the output end of the drive device (2). The drive device (2) is used to drive the upper end of the soft curtain door (3) to rotate. The soft curtain door (3) includes a plurality of door curtain fabrics (31) and a connecting mechanism (32) arranged alternately in the vertical direction. The door curtain fabrics (31) include a heat insulation layer (311) and a waterproof coating (312) disposed on both sides of the heat insulation layer (311). The connecting mechanism (32) extends in the first direction and is detachably connected to two adjacent door curtain fabrics (31). A protective airbag (4) is disposed at the bottom of the soft curtain door (3), and the size of the protective airbag (4) in the first direction is not less than the distance between the two columns (11).

2. The lifting door according to claim 1, characterized in that, The connecting mechanism (32) includes: A connecting block (321) is provided with a first gap (3211) at its upper end and a second gap (3212) at its lower end. The upper part of the connecting block (321) is provided with a first through hole (3213) communicating with the first gap (3211), and the lower part of the connecting block (321) is provided with a second through hole (3214) communicating with the second gap (3212). The first gap (3211), the second gap (3212), the first through hole (3213), and the second through hole (3214) all extend along the first direction. The first rod (322) is located inside the first through hole (3213). Both ends of the first rod (322) extend outside the first through hole (3213). The bottom of the door curtain fabric (31) located above the connecting block (321) passes through the first gap (3211) and is wound around the first rod (322). The second rod (323) is located in the second through hole (3214). Both ends of the second rod (323) extend out of the second through hole (3214). The top of the door curtain (31) located below the connecting block (321) passes through the second gap (3212) and is wound around the second rod (323). Multiple first fixing members are respectively sleeved on both ends of the first rod (322) and the second rod (323).

3. The lifting door according to claim 2, characterized in that, Both ends of the first rod (322) and the second rod (323) are provided with threaded portions, and the first fixing member is a nut, which is threadedly connected to the threaded portion.

4. The lifting door according to claim 1, characterized in that, The bottom of the soft curtain door (3) is provided with a counterweight plate (33), the upper part of the counterweight plate (33) is detachably connected to the bottom of the soft curtain door (3), and the lower part of the counterweight plate (33) is detachably connected to the protective airbag (4).

5. The lifting door according to claim 4, characterized in that, The counterweight plate (33) includes: The counterweight (331) has a third gap (3311) at its upper end and a fourth gap (3312) at its lower end. The upper part of the counterweight (331) has a third through hole (3313) communicating with the third gap (3311), and the lower part of the counterweight (331) has a fourth through hole (3314) communicating with the fourth gap (3312). The third gap (3311), the fourth gap (3312), the third through hole (3313), and the fourth through hole (3314) all extend along the first direction. The third rod (332) is located inside the third through hole (3313). Both ends of the third rod (332) extend outside the third through hole (3313). The bottom of the door curtain (31) located above the counterweight (331) passes through the third gap (3311) and is wound around the third rod (332). The fourth rod (333) is located in the fourth through hole (3314), with both ends of the fourth rod (333) extending out of the fourth through hole (3314). The upper end of the protective airbag (4) passes through the fourth gap (3312) and then wraps around the fourth rod (333). Four second fasteners are respectively fitted onto the two ends of the third rod (332) and the fourth rod (333).

6. The lifting door according to claim 1, characterized in that, It also includes a control unit. A pair of photoelectric detection switches (5) are provided below the two columns (11). The photoelectric detection switches (5) are electrically connected to the control unit and are used to detect whether an object passes through the lifting door after the soft curtain door (3) is raised.

7. The lifting door according to claim 6, characterized in that, The drive device (2) includes a motor and a drum. The upper end of the uppermost curtain fabric (31) is wound around the drum, and the output end of the motor is connected to one end of the drum.

8. The lifting door according to claim 7, characterized in that, The motor is equipped with a stroke positioner, which is electrically connected to the control unit and is used to detect the number of rotations of the motor.

9. The lifting door according to claim 1, characterized in that, The insulation layer (311) is made of polyester fiber material, and the waterproof coating (312) is made of polyvinyl chloride material.

10. The lifting door according to claim 1, characterized in that, The curtain (31) has orange warning strips around its perimeter.

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