Roller shutter door and mobile robot

Abstract

The utility model relates to a roller shutter door and a mobile robot. The roller shutter door comprises a support; the door frame comprises a side frame and a bottom frame, the top of the side frame is fixedly connected with the side edge of the support, and the bottom of the side frame is fixedly connected with the bottom frame; the base is arranged on the support in a striding mode. The base comprises a mounting side edge mounted on the bracket and a connecting transverse edge connected with the mounting side edge; the driving assembly is detachably mounted on the base; the driving assembly comprises a mounting seat detachably mounted on the mounting side edge, a driving roller and a driven roller; the mounting seat is used for mounting the driving mechanism; the end part of the driving roller and the end part of the driven roller are mounted at notches formed in the mounting side edges; the roller shutter assembly comprises a flexible roller shutter, the top end of the flexible roller shutter is fixedly connected with the driving roller, and the bottom end of the flexible roller shutter is wound around the driven roller and then falls down along the inner side of the door frame. The roller shutter door provided by the utility model is higher in adaptability, can adapt to various types of driving systems, and can facilitate repair and maintenance of the driving assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of dustproof equipment, in particular to a rolling door and a mobile robot. Background Art

[0002] Rolling shutter doors are a common door structure in modern production and life, and are widely used in all walks of life. Mobile robots (such as AGV, IGV, AMR) also use this type of rolling shutter door, which plays a role in safety, sealing, and dust prevention.

[0003] Taking the photovoltaic field as an example, in order to realize the flow of silicon wafers between different workstations or production lines, mobile robots with caching functions are generally used to transport silicon wafers. Specifically, a basket carrying multiple silicon wafers is transferred to the silicon wafer processing line by a mobile robot, and an empty silicon wafer basket is received from the silicon wafer processing line. Due to the high quality requirements of silicon wafer processing, dust should be avoided as much as possible during the circulation of silicon wafers. In the prior art, in order to solve this problem, a rolling door device is usually set at the cache entrance of the mobile robot.

[0004] However, the existing rolling door drive system has poor adaptability. For example, different companies have different requirements for rolling door drive systems due to the environment or other factors, while the existing rolling door drive systems are relatively single and can usually only adapt to one type of drive system. Utility Model Content

[0005] Aiming at the deficiencies of the prior art, the utility model discloses a rolling door and a mobile robot.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A rolling door, comprising:

[0008] Bracket;

[0009] The door frame comprises a side frame and a bottom frame, wherein the top of the side frame is fixedly connected to the side of the bracket, and the bottom of the side frame is fixedly connected to the bottom frame;

[0010] A base is straddled on the bracket; the base comprises a mounting side edge mounted on the bracket and a connecting horizontal edge connected to the mounting side edge; the mounting side edge is respectively provided with a first U-shaped groove and a second U-shaped groove;

[0011] A driving assembly is detachably mounted on the base; the driving assembly comprises a mounting seat detachably mounted on the mounting side and a driving roller and a driven roller arranged in parallel; the mounting seat is used to mount the driving mechanism; the end of the driving roller is mounted on the first U-shaped groove, and the end of the driven roller is mounted on the second U-shaped groove;

[0012] The rolling curtain assembly comprises a flexible rolling curtain, the top end of which is fixedly connected to the active roller, and the bottom end of which is wound around the driven roller and then hangs down along the inner side of the door frame.

[0013] In one embodiment of the present invention, the active roller is a motorized roller, and both ends of the motorized roller are fixedly mounted on the first U-shaped groove.

[0014] In one embodiment of the utility model, the active roller is an unpowered roller, and both ends of the unpowered roller are rotatably mounted on the first U-shaped groove; the mounting seat includes a driving mounting seat and an adjusting mounting seat connected by bolts and with adjustable relative positions; the driving mounting seat is detachably mounted on the mounting side;

[0015] The driving mechanism includes a driving motor, a driving sprocket, a driven sprocket and a transmission chain. The driving motor is installed on the adjustment mounting seat; the driving sprocket is installed on the output end of the driving motor, and the driven sprocket is installed on one end of the driving roller; the transmission chain is wound around the driving sprocket and the driven sprocket.

[0016] In one embodiment of the utility model, at least one waist-shaped hole is provided on the driving mounting seat; the driving mechanism further comprises a fastening bolt, and the fastening bolt passes through the waist-shaped hole and is connected to the adjusting mounting seat.

[0017] In one embodiment of the utility model, a groove is formed on the surface of the active roller along the axial direction, and the top end of the flexible rolling curtain is embedded in the groove and fixed by bonding.

[0018] In one embodiment of the utility model, the rolling shutter assembly also includes a guiding mechanism, which includes a lining plate fixed to the bottom end of the flexible rolling shutter, a counterweight bar, and a guide track arranged on the inner side of the side frame; the lining plate is clamped and fixed to the bottom end of the flexible rolling shutter by the counterweight bar; guide grooves are opened on the opposite sides of the guide track; and both ends of the lining plate extend horizontally into the guide grooves.

[0019] In one embodiment of the utility model, guide wheels are respectively provided at both ends of the lining plate, and the guide wheels can roll along the guide grooves.

[0020] The utility model also provides a mobile robot, comprising:

[0021] Mobile chassis;

[0022] A cache body is arranged on the mobile chassis; one side of the cache body is open, and extends horizontally inward from the opening to form a cache cavity;

[0023] The rolling shutter door as described above is arranged at the opening of the cache body and cooperates with the cache body to close the cache cavity.

[0024] In one embodiment of the utility model, it also includes an air purifier arranged on the top of the cache body.

[0025] In one embodiment of the utility model, it also includes limit sensors arranged at the bottom of the rolling door and the inner wall of the top of the buffer cavity to detect the state of the rolling door.

[0026] The above technical solution of the utility model has the following advantages compared with the prior art:

[0027] The rolling shutter door of the utility model has higher adaptability and can be adapted to various types of drive systems. In addition, the rolling shutter mechanism provided in this embodiment can facilitate the repair and maintenance of the drive system.

[0028] The robot of the utility model has a good dustproof effect, preventing the running materials from being contaminated by floating dust. In addition, it is convenient to upgrade and transform the old mobile robot, reducing the structural damage to the old mobile robot. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0030] Figure 1 It is a structural schematic diagram of the mobile robot in the utility model.

[0031] Figure 2 It is a structural schematic diagram of the rolling shutter door in the utility model.

[0032] Figure 3 It is a structural schematic diagram of a base, a driving assembly and a rolling curtain assembly in the utility model.

[0033] Figure 4 It is a structural schematic diagram of the base and the driving assembly (excluding the driving motor, the driving sprocket, the driven sprocket and the transmission chain) in the utility model.

[0034] Figure 5 It is a structural schematic diagram of a drive assembly (excluding a drive mounting seat and an adjustment mounting seat) and a roller shutter assembly in the utility model.

[0035] Figure 6 It is a cross-sectional view of the rolling curtain assembly in the utility model.

[0036] Description of the Figures in the Specification:

[0037] 100, bracket; 101, first bracket; 102, second bracket;

[0038] 200, door frame; 201, side frame; 2011, connector; 202, bottom frame; 203, exhaust port; 204, track connecting plate;

[0039] 300, base; 301, mounting side; 3011, first U-shaped groove; 3012, second U-shaped groove; 302, connecting horizontal edge; 303, folding edge;

[0040] 400, driving assembly; 401, driving roller; 402, driven roller; 403, driving mounting seat; 4031, waist-shaped hole; 404, adjusting mounting seat; 405, driving motor; 406, driving sprocket; 407, driven sprocket; 408, transmission chain; 409, fastening bolt; 410, bearing seat; 411, mounting plate; 412, limit block;

[0041] 500, rolling curtain assembly; 501, flexible rolling curtain; 502, lining plate; 503, counterweight bar; 504, guide track; 5041, guide groove; 505, guide wheel;

[0042] 600. Mobile chassis; 700. Cache body; 800. Air purifier; 900. Limit sensor. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0044] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions of the reference drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention. In addition, in all embodiments, the same reference numerals represent the same elements.

[0045] It has been found in actual use that the drive system of existing rolling door equipment has poor adaptability. For example, different companies have different requirements for the drive system of rolling door equipment due to the environment or other factors, while the existing drive system of rolling door equipment is relatively single and can usually only adapt to one type of drive system.

[0046] In order to solve the above problems, the utility model provides a rolling door and a mobile robot.

[0047] Reference Figure 1As shown, this embodiment provides a mobile robot, including a mobile chassis 600, a cache body 700, a rolling door and an air purifier 800.

[0048] Specifically, the mobile chassis 600 can adopt a chassis structure of the type of IGV (Intelligent Guided Vehicle), AGV (Automated Guided Vehicles) or AMR (Autonomous Mobile Robot) to realize the movement of the mobile robot between different locations.

[0049] The cache body 700 is arranged on the mobile chassis 600. One side of the cache body 700 is open, and a cache cavity is horizontally extended inward from the opening. The cache cavity is configured to cache a flower basket. For this embodiment, a conveying device is arranged in the cache cavity to move the flower basket in or out. Among them, the conveying device can transport the flower basket by belt conveyor. The conveying device of the belt conveyor structure can also be equivalently replaced by other conveying devices, such as a roller / roller conveyor device. The specific structure of the conveying device is irrelevant to the technical problem to be solved by the application, and will not be described here.

[0050] Reference Figure 2 and Figure 3 As shown, the rolling door includes a bracket 100 , a door frame 200 , a base 300 , a driving assembly 400 and a rolling shutter assembly 500 .

[0051] Among them, combined Figure 1 and Figure 2 , the bracket 100 is horizontally arranged on the top of the cache body 700. In this embodiment, the bracket 100 includes a first bracket 101 and a second bracket 102 arranged in parallel, the first bracket 101 and the second bracket 102 are horizontally arranged on the top of the cache body 700, and the first bracket 101 and the second bracket 102 extend horizontally along the depth direction of the cache cavity of the cache body 700 to form a basis for installing the door frame 200. The first bracket 101 and the second bracket 102 can be made of aluminum profiles.

[0052] The door frame 200 is arranged at the opening of the cache body 700. The top of the door frame 200 is fixedly connected to the bracket 100, and the side of the door frame 200 is fixedly connected to the cache body 700 through a connector 2011. Specifically, the door frame 200 includes a side frame 201 and a bottom frame 202. The top of the side frame 201 is fixedly connected to the side of the bracket 100. The bottom of the side frame 201 is fixedly connected to the bottom frame 202, and a plurality of connectors 2011 are arranged on the inner side of the side frame 201 to connect the inner wall of the cache cavity of the cache body 700. The connector 2011 is provided with a plurality of connecting holes so that the side frame 201 and the inner wall of the cache cavity can be connected by bolts. This arrangement can facilitate the upgrading and transformation of old mobile robots, and directly install a rolling shutter door at the opening of the mobile robot cache body 700 to reduce the structural damage to the old mobile robot.

[0053] Combination Figure 2-Figure 5 , the base 300 is arranged across the bracket 100, and the base 300 includes a mounting side 301 mounted on the bracket 100 and a connecting horizontal side 302 connecting the mounting side 301. Specifically, there are two mounting side 301, and the two mounting side 301 are arranged in parallel. The connecting horizontal side 302 connects the two mounting side 301, that is, the connecting horizontal side 302 is located between the two mounting side 301, and the shape is groove-shaped. The mounting side 301 is respectively provided with a first U-shaped groove 3011 and a second U-shaped groove 3012. Among them, the opening directions of the first U-shaped groove 3011 and the second U-shaped groove 3012 are different. A folded edge 303 is provided at the end of the mounting side 301 away from the connecting horizontal side 302. Among them, the folded edge 303 can be bent to form a rib to improve the strength of the mounting side 301 on the one hand, and on the other hand, it provides an installation foundation for the drive assembly 400. Optionally, the mounting side edge 301 and the folded edge 303 may be integrally formed, or the mounting side edge 301 and the folded edge 303 may be welded or connected in other ways.

[0054] Combination Figure 4 and Figure 5 The driving assembly 400 is detachably mounted on the base 300. The driving assembly 400 includes a mounting seat detachably mounted on the mounting side 301 and a driving roller 401 and a driven roller 402 arranged in parallel. The mounting seat is used to install the driving mechanism. The two ends of the driving roller 401 are mounted on the first U-shaped groove 3011 through the bearing seat 410. The two ends of the driven roller 402 are mounted on the second U-shaped groove 3012 through the mounting plate 411. The specific installation method can be referred to Figure 4 Specifically, Figure 4 As shown, the first U-shaped groove 3011 is opened from top to bottom, and the second U-shaped groove 3012 is opened from bottom to top. The first U-shaped groove 3011 is opened from top to bottom to facilitate the disassembly of the active roller 401, and the second U-shaped groove 3012 is opened from bottom to top to avoid the installation of subsequent other components.

[0055] When the active roller 401 is an unpowered roller, the two ends of the unpowered roller can be rotatably mounted on the first U-shaped groove 3011 through the bearing seat 410. The mounting seat includes a driving mounting seat 403 and an adjusting mounting seat 404 which are connected by bolts and whose relative positions are adjustable. The driving mounting seat 403 is detachably mounted on the mounting side 301. In this embodiment, the driving mechanism includes a driving motor 405, a driving sprocket 406, a driven sprocket 407, a transmission chain 408 and a fastening bolt 409. Specifically, the driving mounting seat 403 is mounted on the folding edge 303 of the base 300. A waist-shaped hole 4031 is provided on the driving mounting seat 403. The fastening bolt 409 passes through the waist-shaped hole 4031 and is connected to the adjusting mounting seat 404. By loosening and tightening the fastening bolt 409, the position of the adjusting mounting seat 404 relative to the driving mounting seat 403 can be adjusted along the direction of the waist-shaped hole 4031. The driving motor 405 is mounted on the adjusting mounting seat 404. The driving sprocket 406 is installed at the output end of the driving motor 405, the driven sprocket 407 is installed at one end of the driving roller 401, and the transmission chain 408 is wound around the driving sprocket 406 and the driven sprocket 407. By utilizing the adjustability of the position of the adjusting mounting seat 404 and the driving mounting seat 403, the transmission chain 408 can be tensioned and adjusted to avoid excessive sag of the transmission chain 408, resulting in poor meshing and transmission vibration, and at the same time, the wrap angle of the transmission chain 408 is increased to meet the transmission design requirements.

[0056] Combination Figure 5 and Figure 6 , the rolling shutter assembly 500 includes a flexible rolling shutter 501 and a guiding mechanism. In the present embodiment, the material of the flexible rolling shutter 501 is preferably polyvinyl chloride (PVC). The top of the flexible rolling shutter 501 is fixedly connected to the active roller 401. Specifically, the active roller 401 is made of aluminum alloy, and a groove is provided on its surface along the axial direction of the active roller 401. The top edge of the flexible rolling shutter 501 is stuck in the groove, and is fixed for a second time by double-sided tape to prevent the flexible rolling shutter 501 and the active roller 401 from easily detaching under the action of external force. The bottom end of the flexible rolling shutter 501 is wound around the driven roller 402 and then hangs down along the inner side of the door frame 200. When the active roller 401 rotates, the flexible rolling shutter 501 can be wound on the active roller 401. Furthermore, the winding direction of the flexible rolling curtain 501 on the active roller 401 is opposite to that of the driven roller 402, so that the flexible rolling curtain 501 can be tensioned between the active roller 401 and the driven roller 402, so that the flexible rolling curtain 501 is tightly wound on the active roller 401. In addition, annular limit blocks 412 are respectively provided at both ends of the driven roller 402 to prevent the flexible rolling curtain 501 from deviating during the rising and falling process.

[0057] The guide mechanism includes a lining plate 502 fixed to the bottom end of the flexible rolling curtain 501, a counterweight bar 503, and a guide track 504 arranged on the inner side of the door frame 200. The lining plate 502 and the counterweight bar 503 are made of steel material, which can play a certain counterweight effect, so that the flexible rolling curtain 501 can be kept flat. Specifically, the steel lining plate 502 is clamped and fixed to the bottom end of the flexible rolling curtain 501 by the steel counterweight bar 503. The guide track 504 is arranged on the inner side of the side frame 201. The opposite side of the guide track 504 is provided with a guide groove 5041. The two ends of the lining plate 502 extend horizontally into the guide groove 5041 of the guide track 504. The moving direction of the lining plate 502 is guided by the guide track 504, so as to facilitate the opening and closing of the flexible rolling curtain 501.

[0058] It should be noted that the guide rail 504 is preferably an extruded aluminum alloy rail. Of course, the guide rail 504 can also be made by sheet metal bending. Compared with the extruded aluminum alloy rail, the sheet metal bending has a large error and many burrs on the edge, which has been verified through implementation.

[0059] In a further embodiment, Figure 6 As shown, guide wheels 505 are respectively provided at both ends of the lining plate 502, and the guide wheels 505 can roll along the guide grooves 5041 of the guide track 504. The guide wheels 505 are preferably made of wear-resistant, corrosion-resistant and low-abrasive material, such as polyoxymethylene POM, to enhance its durability and reduce the generation of abrasive debris.

[0060] In a further embodiment, Figure 2 As shown, a track connecting plate 204 is further provided at the bottom of the door frame 200 , and the parallelism of the guide track 504 is strengthened and fixed by the track connecting plate 204 to avoid large deformation caused by the large length of the guide track 504 .

[0061] As a variation, the drive assembly 400 in this embodiment can cancel the mounting seat and the driving mechanism, namely the drive mounting seat 403, the adjustment mounting seat 404, the drive motor 405, the driving sprocket 406, the driven sprocket 407 and the transmission chain 408, and adjust the active roller 401 to be replaced by an electric roller (not shown in the figure). At this time, the two ends of the electric roller can be directly fixedly installed in the first U-shaped groove 3011. And further fix the flexible roller 501 on the electric roller by double-sided tape. It can be seen that the use of electric roller drive does not require the configuration of transmission parts such as transmission chains and transmission sprockets. The number of required parts is small, the structure is simple, the cost is low, the production cost is reduced after replacement, and the installation is also convenient. In addition, different adjustment mounting seats 404 can be adjusted to adapt to different models of drive motors 405. Therefore, the rolling shutter door provided in this embodiment has higher adaptability and can adapt to various types of drive assemblies 400. In addition, the rolling shutter door provided in this embodiment can facilitate the repair and maintenance of the drive assembly 400.

[0062] In a further embodiment, referring to Figure 1 As shown, the mobile robot also includes an air purifier 800 disposed on the top of the cache body 700. The air purifier 800 can purify the air and introduce it into the cache cavity of the cache body 700, so that high pressure is formed in the cache cavity to prevent air contaminated by external dust from entering the cache cavity. In addition, an exhaust port 203 is provided at the bottom of the door frame 200 for exhausting the cache cavity. Specifically, an air filter element and an ozone aluminum honeycomb are provided in the air purifier 800 to purify the air introduced into the cache body 700 and remove ozone.

[0063] In a further embodiment, referring to Figure 1 As shown, the mobile robot also includes a limit sensor 900 arranged at the bottom of the door frame 200 and the top inner wall of the buffer cavity, which is used to detect the state of the rolling door, that is, whether the rolling door is fully opened or fully closed.

[0064] As can be seen from the above, compared with the prior art, the mobile robot provided by this embodiment has a better dust-proof effect, preventing the running materials from being contaminated by floating dust. In addition, it is convenient to upgrade and transform the old mobile robot, reducing the structural damage to the old mobile robot.

[0065] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it 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.

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A rolling door, characterized in that: include: Bracket (100); A door frame (200), comprising a side frame (201) and a bottom frame (202), wherein the top of the side frame (201) is fixedly connected to the side of the bracket (100), and the bottom of the side frame (201) is fixedly connected to the bottom frame (202); A base (300) is straddled on the bracket (100); the base (300) comprises a mounting side edge (301) mounted on the bracket (100) and a connecting horizontal edge (302) connected to the mounting side edge (301); the mounting side edge (301) is respectively provided with a first U-shaped groove (3011) and a second U-shaped groove (3012); A driving assembly (400) is detachably mounted on the base (300); the driving assembly (400) comprises a mounting seat detachably mounted on the mounting side (301) and a driving roller (401) and a driven roller (402) arranged in parallel; the mounting seat is used to mount a driving mechanism; an end of the driving roller (401) is mounted on the first U-shaped groove (3011), and an end of the driven roller (402) is mounted on the second U-shaped groove (3012); The rolling curtain assembly (500) comprises a flexible rolling curtain (501), wherein the top end of the flexible rolling curtain (501) is fixedly connected to the active roller (401), and the bottom end of the flexible rolling curtain (501) is wound around the driven roller (402) and then hangs down along the inner side of the door frame (200).

2. The rolling door according to claim 1, characterized in that: The active roller (401) is a motorized roller, and both ends of the motorized roller are fixedly mounted in the first U-shaped groove (3011).

3. The rolling door according to claim 1, characterized in that: The active roller (401) is an unpowered roller, and both ends of the unpowered roller are rotatably mounted on the first U-shaped groove (3011); the mounting seat comprises a driving mounting seat (403) and an adjusting mounting seat (404) which are connected by bolts and whose relative positions are adjustable; the driving mounting seat (403) is detachably mounted on the mounting side edge (301); The driving mechanism comprises a driving motor (405), a driving sprocket (406), a driven sprocket (407) and a transmission chain (408); the driving motor (405) is mounted on the adjusting mounting seat (404); the driving sprocket (406) is mounted on the output end of the driving motor (405); the driven sprocket (407) is mounted on one end of the driving roller (401); and the transmission chain (408) is wound around the driving sprocket (406) and the driven sprocket (407).

4. The rolling door according to claim 3, characterized in that: The driving mounting seat (403) is provided with at least one waist-shaped hole (4031); the driving mechanism further comprises a fastening bolt (409), and the fastening bolt (409) passes through the waist-shaped hole and is connected to the adjusting mounting seat (404).

5. The rolling door according to claim 1, characterized in that: A groove is formed on the surface of the active roller (401) along the axial direction, and the top end of the flexible rolling curtain (501) is embedded in the groove and fixed by bonding.

6. The rolling door according to claim 1, characterized in that: The roller blind assembly (500) further comprises a guiding mechanism, which comprises a lining plate (502) fixed to the bottom end of the flexible roller blind (501), a counterweight bar (503) and a guiding track (504) arranged on the inner side of the side frame (201); the lining plate (502) is clamped and fixed to the bottom end of the flexible roller blind (501) by the counterweight bar (503); a guiding groove (5041) is formed on the opposite side of the guiding track (504); and both ends of the lining plate (502) extend horizontally into the guiding groove (5041).

7. The rolling door according to claim 6, characterized in that: Guide wheels (505) are respectively provided at both ends of the lining plate (502), and the guide wheels (505) can roll along the guide grooves (5041).

8. A mobile robot, characterized in that: include: Mobile chassis (600); A cache body (700) is arranged on the mobile chassis (600); one side of the cache body (700) is open, and extends horizontally inward from the opening to form a cache cavity; The rolling shutter door as described in any one of claims 1 to 7 is arranged at the opening of the cache body (700) and cooperates with the cache body (700) to close the cache cavity.

9. The mobile robot according to claim 8, characterized in that: It also includes an air purifier (800) arranged on the top of the cache body (700).

10. The mobile robot according to claim 8, characterized in that: It also includes a limit sensor (900) arranged at the bottom of the rolling door and the inner wall of the top of the buffer cavity, for detecting the state of the rolling door.

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