A monitoring device for an elevator internet of things device

Abstract

This invention belongs to the technical field of monitoring devices, specifically a monitoring device for elevator IoT devices. Addressing the issue of poor air circulation inside elevators, which easily leads to water mist affecting monitoring performance, the following solution is proposed: A mounting base, a fixing seat, and an elevator car panel are included. An installation opening is formed on one inner wall of the mounting base. An airflow chamber is fixedly connected to the inner wall of the installation opening, and two air collection buckets are fixedly connected to one outer wall of the airflow chamber. The input ends of the two air collection buckets are fixedly connected to the same air collection chamber. Air inlets are fixedly connected to the top and bottom of the air collection chamber, and three guide plates are evenly spaced inside the two air inlets. Two mounting brackets are fixedly connected inside the airflow chamber. This invention discloses a monitoring device for elevator IoT devices that improves air circulation around the monitoring device, preventing misting on the device's surface, ensuring its effectiveness, and allowing for surface cleaning.

Description

Technical Field

[0001] This invention relates to the field of monitoring device technology, and in particular to a monitoring device for elevator Internet of Things (IoT) devices. Background Technology

[0002] The Internet of Things (IoT) refers to the use of various information sensors, radio frequency identification (RFID) technology, global positioning systems (GPS), infrared sensors, laser scanners, and other devices and technologies to collect real-time information on any object or process that needs to be monitored, connected, or interacted with. This information includes sound, light, heat, electricity, mechanics, chemistry, biology, location, and other necessary data. Through various possible network access methods, ubiquitous connections between things and between things and people are achieved, enabling intelligent perception, identification, and management of objects and processes.

[0003] The Internet of Things (IoT) for elevators is a concept proposed to solve elevator safety issues. A complete elevator IoT monitoring system consists of data acquisition, data transmission, central processing, and application software. The data acquisition device collects elevator operation data, analyzes it, and uploads it to the Internet monitoring center. Combined with the platform application software, this enables relevant units to monitor and maintain elevators in real time.

[0004] When existing monitoring devices are used inside elevators, the poor air circulation inside the elevator, coupled with residual moisture left after cleaning by cleaning staff, creates a humid and hot environment. This can cause water vapor to form on the surface of the monitoring devices, thus affecting the clarity of the monitoring during use. Summary of the Invention

[0005] This invention discloses a monitoring device for elevator Internet of Things (IoT) equipment, aiming to solve the problem in the background art where existing monitoring devices, when used inside elevators, suffer from poor air circulation and residual moisture after cleaning by cleaning personnel, resulting in a humid and hot environment inside the elevator. This causes fogging and water mist on the surface of the monitoring device, thus affecting the monitoring clarity during use.

[0006] This invention proposes a monitoring device for an elevator IoT device, comprising a mounting base, a fixed base, and an elevator car panel. An installation opening is provided on one inner wall of the mounting base. An airflow chamber is fixedly connected to the inner wall of the installation opening, and two air collection buckets are fixedly connected to one outer wall of the airflow chamber. The input ends of the two air collection buckets are fixedly connected to the same air collection chamber. Air inlets are fixedly connected to the top and bottom of the air collection chamber, and three guide plates are evenly spaced inside the two air inlets. Two mounting brackets are fixedly connected inside the airflow chamber, and mounting rods are movably connected to the inner walls of the two mounting brackets. Drive fans are fixedly connected to the outer walls of the two mounting rods. A transmission rod is movably connected to one inner wall of the airflow chamber. One end of the moving rod is fixedly connected to a transmission gear, and the outer wall of the transmission rod and the outer wall of one of the mounting rods are both fixedly connected to transmission wheels. The outer walls of the two transmission wheels are provided with the same transmission belt. The bottom of the fixed base is provided with the monitoring device body, and one side of the outer wall of the airflow chamber is fixedly connected to an airflow pipe. The outer wall of the airflow pipe has multiple air holes, and the monitoring device body is located inside the airflow pipe. The outer wall of the fixed base has an annular groove, and a gear ring is movably connected inside the annular groove. The gear ring meshes with the transmission gear. The bottom of the gear ring is fixedly connected to a cleaning arc plate, and one side of the outer wall of the cleaning arc plate is fixedly connected to a cleaning component. The outer wall of the cleaning component is in contact with the outer wall of the monitoring device body.

[0007] By incorporating an air intake component, air collection chamber, air collection bucket, gear ring, airflow pipe, cleaning arc plate, cleaning component, drive fan, transmission belt, mounting rod, and transmission gear, the air intake component, air collection bucket, and air collection chamber can deliver external air into the elevator during elevator operation and discharge it through the airflow pipe and air vents. This increases the airflow around the monitoring device, preventing the surface of the monitoring device from fogging up due to the humid and hot environment inside the elevator. This ensures the clarity of the images captured by the monitoring equipment during elevator operation and improves its performance. In addition to increasing airflow, the air collection bucket increases the air velocity, causing the drive fan to rotate. The drive fan, transmission belt, transmission gear, and gear ring drive the cleaning component to clean the surface of the monitoring device, removing dust and watermarks caused by the drying of water vapor adhering to the surface of the monitoring device, thereby further improving the clarity of its images.

[0008] In a preferred embodiment, one outer wall of the mounting base contacts one outer wall of the elevator car panel, and a limiting opening is provided on one outer wall of the elevator car panel. The outer walls of the two air collection hoppers are movably connected to the inner walls of the limiting opening. An installation port is provided on the top of the mounting base, and a fixing frame is fixedly connected inside the installation port. A drive motor is fixedly connected to the inner wall of the fixing frame. The output shaft of the drive motor is connected to a drive gear through a coupling. A rack is fixedly connected to the outer wall of the elevator car panel facing the mounting base, and the drive gear meshes with the rack.

[0009] By incorporating a rack, limit port, drive motor, mounting bracket, and drive gear, a small blind spot will appear beneath the main body of the monitoring device during use. The drive gear and rack can then be used to adjust the position of the monitoring device, thereby changing the location of the blind spot. This allows for monitoring of the previously observed location while simultaneously changing the monitored position. Furthermore, the monitoring range outside the elevator entrance also changes with the change in monitoring location, thus increasing the monitoring range of the main body of the monitoring device. During movement, the limit port and air collection hopper can limit the device's movement, ensuring its stability.

[0010] In a preferred embodiment, the top inner wall of the mounting base has a fixing opening, the top of the fixing base contacts the top inner wall of the fixing opening, and four positioning rods are fixedly connected to the top inner wall of the fixing opening; the top of the fixing base has four positioning holes, the inner walls of the four positioning holes respectively contact the outer walls of the four positioning rods, and four fixing members are fixedly connected inside the fixing opening, each of the four fixing members having two fixing through-holes at its bottom; four mounting members are fixedly connected to one side inner wall of the mounting base, each of the four mounting members having a connecting rod fixedly connected inside, and the outer walls of the four connecting rods are movably connected to limit members, all of the four limit members being located inside the fixing opening; torsion springs are sleeved on the outer walls of the four connecting rods, and one end of each of the four torsion springs is fixedly connected to one side inner wall of each of the four mounting members; the other end of each of the four torsion springs is fixedly connected to one side outer wall of each of the four limit members; two protrusions are fixedly connected to the bottom of each of the four limit members, and the outer walls of the eight protrusions respectively contact the inner walls of the eight fixing through-holes.

[0011] The device is equipped with a fixing port, fixing seat, mounting parts, limiting parts, connecting rods, torsion springs, protrusions, fixing parts, positioning rods, positioning holes, and fixing ports. The positioning rods and positioning holes can limit the position of the fixing seat and the monitoring device body to avoid deviations during installation that could lead to unstable fixation, thereby improving the practicality of the device. During installation and disassembly, the limiting parts, protrusions, and fixing ports allow for quick installation and disassembly of the fixing seat, improving the convenience of installation and maintenance. Furthermore, during installation, the torsion springs can drive the limiting parts to automatically fix the fixing seat, further enhancing the effectiveness and convenience of the device.

[0012] As can be seen from the above, the monitoring device for elevator IoT devices provided by the present invention can improve the air circulation around the monitoring device, prevent fogging on the surface of the monitoring device, ensure its performance, and clean its surface. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the overall structure of a monitoring device for an elevator Internet of Things (IoT) device proposed in this invention.

[0014] Figure 2 This is a schematic diagram of the overall top view of the monitoring device for an elevator Internet of Things (IoT) device proposed in this invention;

[0015] Figure 3 This is a schematic diagram of the combined structure of the airflow chamber and air collection hopper of the monitoring device for an elevator Internet of Things (IoT) device proposed in this invention.

[0016] Figure 4 This is a schematic diagram of the cleaning component and gear ring combination structure of the monitoring device for an elevator Internet of Things (IoT) device proposed in this invention;

[0017] Figure 5 This is a schematic diagram of the combined structure of the guide plate and air intake component of the monitoring device for an elevator Internet of Things (IoT) device proposed in this invention.

[0018] Figure 6 This is a schematic diagram of the combination structure of the fixed base and the annular groove of the monitoring device for an elevator Internet of Things device proposed in this invention;

[0019] Figure 7 This is a schematic diagram of the combination structure of the fixing component and the protrusion of the monitoring device for an elevator Internet of Things (IoT) device proposed in this invention.

[0020] In the diagram: 1. Mounting base; 2. Monitoring device body; 3. Rack; 4. Elevator car panel; 5. Mounting port; 6. Limiting port; 7. Fixing port; 8. Airflow pipe; 9. Air inlet; 10. Fixing frame; 11. Drive motor; 12. Drive gear; 13. Air collection chamber; 14. Air collection bucket; 15. Airflow chamber; 16. Air hole; 17. Mounting frame; 18. Transmission belt; 19. Transmission wheel; 20. Transmission rod; 21. Transmission gear; 22. Gear ring; 23. Cleaning component; 24. Cleaning arc plate; 25. Drive fan; 26. Mounting rod; 27. Guide plate; 28. Fixing seat; 29. ​​Positioning rod; 30. Fixing component; 31. Annular groove; 32. Positioning hole; 33. Fixing port; 34. Limiting component; 35. Protrusion; 36. Torsion spring; 37. Mounting component; 38. Connecting rod. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] The elevator IoT device disclosed in this invention is mainly used in scenarios where the air circulation inside the elevator is poor and water mist is likely to occur, affecting the monitoring effect.

[0023] Reference Figure 1-7 A monitoring device for an elevator IoT device includes a mounting base 1, a fixing base 28, and an elevator car panel 4. An installation opening is provided on one inner wall of the mounting base 1. An airflow chamber 15 is fixedly connected to the inner wall of the installation opening. Two air collection buckets 14 are fixedly connected to one outer wall of the airflow chamber 15. The input ends of the two air collection buckets 14 are fixedly connected to the same air collection chamber 13. Air inlets 9 are fixedly connected to the top and bottom of the air collection chamber 13. Three guide plates 27 are evenly spaced inside the two air inlets 9. Two mounting brackets 17 are fixedly connected inside the airflow chamber 15. Mounting rods 26 are rotatably connected to the inner walls of the two mounting brackets 17. Drive fans 25 are fixedly connected to the outer walls of the two mounting rods 26. A transmission rod 20 is connected to one inner wall of the airflow chamber 15 via a bearing. One end of the transmission rod 20... A transmission gear 21 is fixedly connected, and a transmission wheel 19 is fixedly connected to the outer wall of the transmission rod 20 and the outer wall of one of the mounting rods 26. The outer walls of the two transmission wheels 19 are provided with the same transmission belt 18. The bottom of the fixed seat 28 is provided with the monitoring device body 2, and an airflow pipe 8 is fixedly connected to one side of the outer wall of the airflow chamber 15. Multiple air holes 16 are opened on the outer wall of the airflow pipe 8, and the monitoring device body 2 is located inside the airflow pipe 8. An annular groove 31 is opened on the outer wall of the fixed seat 28. A gear ring 22 is rotatably connected inside the annular groove 31, and the gear ring 22 meshes with the transmission gear 21. A cleaning arc plate 24 is fixedly connected to the bottom of the gear ring 22. A cleaning component 23 is fixedly connected to one side of the outer wall of the cleaning arc plate 24, and the outer wall of the cleaning component 23 is in contact with the outer wall of the monitoring device body 2.

[0024] Specifically, during elevator operation, external air can enter the air collection chamber 13 through the air intake 9 and be transported to the air collection bucket 14. The air collection bucket 14 then concentrates and transports the air into the airflow chamber 15, and then into the airflow pipe 8. The air inside the airflow pipe 8 is discharged through the air hole 16 to improve the airflow around the monitoring device body 2. At the same time, as the air enters the airflow chamber 15 through the air collection bucket 14, the air can drive the drive fan 25 and the fixed rod to rotate. Through the transmission wheel 19 and the transmission belt 18, the mounting rod 26 drives the transmission rod 20 to rotate, which in turn drives the transmission gear 21 to rotate. Since the transmission gear 21 meshes with the gear ring 22, the transmission gear 21 can drive the gear ring 22 and the cleaning arc plate 24 to rotate, and the cleaning arc plate 24 drives the cleaning component 23 to clean the monitoring device body 2.

[0025] In specific application scenarios, during elevator operation, the air intake component 9, air collection bucket 14, and air collection chamber 13 can deliver external air into the elevator and discharge it through the airflow pipe 8 and air hole 16 to increase the airflow around the monitoring device body 2. This prevents the surface of the monitoring device body 2 from becoming fogged due to the hot and humid environment inside the elevator, thus ensuring the clarity of the images captured by the monitoring equipment during elevator operation and improving its performance. In addition to increasing airflow, the air collection bucket 14 can increase the air velocity, causing the drive fan 25 to rotate. The drive fan 25, transmission belt 18, transmission gear 21, and gear ring 22 can drive the cleaning component 23 to clean the surface of the monitoring device body 2, thereby cleaning the dust and water marks caused by the drying of water mist adhering to the monitoring device surface, further improving its image clarity.

[0026] Reference Figure 1 , Figure 2 and Figure 3 In a preferred embodiment, one outer wall of the mounting base 1 contacts one outer wall of the elevator car 4, and a limiting port 6 is provided on one outer wall of the elevator car 4. The outer walls of the two air collection hoppers 14 are slidably connected to the inner walls of the limiting port 6. An installation opening 5 is provided on the top of the mounting base 1. A fixing frame 10 is fixedly connected inside the installation opening 5, and a drive motor 11 is fixedly connected to the inner wall of the fixing frame 10. The output shaft of the drive motor 11 is connected to a drive gear 12 through a coupling. A rack 3 is fixedly connected to the outer wall of the elevator car 4 facing the mounting base 1, and the drive gear 12 meshes with the rack 3.

[0027] Specifically, when in use, the drive motor 11 is started, which drives the drive gear 12 to rotate. Since the drive gear 12 meshes with the rack 3, the drive gear 12 can drive the mounting base 1 to move. During the movement, the outer wall of the air collecting hopper 14 is slidably connected to the inner wall of the limiting port 6.

[0028] In specific application scenarios, when the monitoring device body 2 is in use, a small monitoring blind spot will appear below it. At this time, the position of the monitoring device body 2 can be adjusted by the drive gear 12 and rack 3, thereby changing the position of the monitoring blind spot. While changing, the previous position can be monitored. At the same time as the monitoring position changes, the monitoring range outside the elevator entrance also changes, thereby increasing the monitoring range of the monitoring device body 2 during use. When moving, the device can be limited by the limit port 6 and the air collection hopper 14 to ensure the stability of the device.

[0029] Reference Figure 1 , Figure 2 , Figure 6 and Figure 7In a preferred embodiment, the top inner wall of the mounting base 1 has a fixing opening 7, the top of the fixing seat 28 contacts the top inner wall of the fixing opening 7, and four positioning rods 29 are fixedly connected to the top inner wall of the fixing opening 7; the top of the fixing seat 28 has four positioning holes 32, the inner walls of the four positioning holes 32 respectively contact the outer walls of the four positioning rods 29, and four fixing members 30 are fixedly connected inside the fixing opening 7, each of the four fixing members 30 having two fixing through openings 33 at its bottom; four mounting members 37 are fixedly connected to one side inner wall of the mounting base, and four... Each mounting component 37 has a connecting rod 38 fixedly connected inside. The outer walls of the four connecting rods 38 are rotatably connected to limiters 34, and the four limiters 34 are all located inside the fixing port 7. The outer walls of the four connecting rods 38 are fitted with torsion springs 36, and one end of each torsion spring 36 is fixedly connected to one side of the inner wall of each of the four mounting components 37. The other end of each torsion spring 36 is fixedly connected to one side of the outer wall of each of the four limiters 34. The bottom of each of the four limiters 34 is fixedly connected with two protrusions 35, and the outer walls of the eight protrusions 35 are in contact with the inner walls of the eight fixing ports 33.

[0030] Specifically, during the installation and maintenance of the monitoring device body 2, the staff pushes the protrusion 35 upwards to separate it from the fixed opening 33. At this time, the staff can remove the fixing seat 28 from the monitoring device body 2. During installation, the staff first rotates the limiting member 34 so that it is in a vertical position and moves the fixing seat 28 into the fixing opening 7. At this time, the outer wall of the positioning rod 29 contacts the inner wall of the positioning hole 32. When the top of the fixing seat 28 contacts the top inner wall of the fixing opening 7, the limiting member 34 is released. The limiting member 34 is then automatically reset under the action of the torsion spring 36, causing the limiting member 34 to rotate and thus engage the protrusion 35 with the fixed opening 33, thereby completing the fixing of the monitoring device body 2.

[0031] In specific application scenarios, the positioning rod 29 and positioning hole 32 can limit the position of the fixed base 28 and the monitoring device body 2 to avoid deviations during installation that could lead to unstable fixation, thereby improving the practicality of the device. During installation and disassembly, the fixed base 28 can be quickly installed and disassembled through the limiting member 34, the protrusion 35 and the fixing port 33, thereby improving the convenience of device installation and maintenance. During installation, the torsion spring 36 can drive the limiting member 34 to automatically fix the fixed base 28, further increasing the effectiveness and convenience of the device.

[0032] Working Principle: During elevator operation, external air enters the air collection chamber 13 through the air inlet 9 and is then transported to the air collection bucket 14. The air collection bucket 14 concentrates the air and delivers it to the airflow chamber 15, which in turn enters the airflow pipe 8. Air inside the airflow pipe 8 is then discharged through the air vent 16, improving airflow around the monitoring device body 2. Simultaneously, as air enters the airflow chamber 15 through the air collection bucket 14, it drives the drive fan 25 and the fixed rod to rotate. This, in turn, drives the mounting rod 26 to rotate the drive rod 20 via the transmission wheel 19 and the transmission belt 18. This, in turn, drives the transmission gear 21 to rotate. Since the transmission gear 21 meshes with the gear ring 22, it drives the gear ring 22 and the cleaning arc plate 24 to rotate, causing the cleaning arc plate 24 to drive the cleaning component 23 to clean the monitoring device body 2. In use, the drive motor 11 is started, which drives the drive fan 25 to rotate. The drive gear 12 rotates, and because the drive gear 12 meshes with the rack 3, the drive gear 12 can drive the mounting base 1 to move. During the movement, the outer wall of the air collecting hopper 14 slides in connection with the inner wall of the limiting port 6. When installing or repairing the monitoring device body 2, the operator pushes the protrusion 35 upwards to separate the protrusion 35 from the fixing port 33. At this time, the operator can remove the fixing base 28 from the monitoring device body 2. When installing, the operator... First, rotate the limiting member 34 so that it is in a vertical position, and move the fixing seat 28 into the fixing port 7. At this time, the outer wall of the positioning rod 29 contacts the inner wall of the positioning hole 32. When the top of the fixing seat 28 contacts the top inner wall of the fixing port 7, release the limiting member 34. At this time, the limiting member 34 will automatically reset under the action of the torsion spring 36, thereby causing the limiting member 34 to rotate, which in turn drives the protrusion 35 to engage with the fixing port 33, thus completing the fixing of the monitoring device body 2.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A monitoring device for an elevator Internet of Things (IoT) device, comprising a mounting base (1), a fixing seat (28), and an elevator car panel (4), characterized in that, An installation opening is provided on one inner wall of the mounting base (1). An airflow chamber (15) is fixedly connected to the inner wall of the installation opening. Two air collection buckets (14) are fixedly connected to one outer wall of the airflow chamber (15). The input ends of the two air collection buckets (14) are fixedly connected to the same air collection chamber (13). An air inlet (9) is fixedly connected to the top and bottom of the air collection chamber (13). Three guide plates (27) are provided at equal intervals inside the two air inlets (9). Two mounting brackets (17) are fixedly connected inside the airflow chamber (15). Mounting rods (26) are movably connected to the inner walls of the two mounting brackets (17). A drive fan (25) is fixedly connected to the outer walls of the two mounting rods (26). A transmission rod (20) is movably connected to one inner wall of the airflow chamber (15). A transmission gear (21) is fixedly connected to one end of the transmission rod (20). The outer wall of the transmission rod (20) is connected to... One of the mounting rods (26) has a transmission wheel (19) fixedly connected to its outer wall. The two transmission wheels (19) have the same transmission belt (18) on their outer walls. The bottom of the fixed seat (28) has a monitoring device body (2). An airflow pipe (8) is fixedly connected to one side of the airflow chamber (15). The outer wall of the airflow pipe (8) has multiple air holes (16). The monitoring device body (2) is located inside the airflow pipe (8). The outer wall of the fixed seat (28) has an annular groove (31). A gear ring (22) is movably connected inside the annular groove (31). The gear ring (22) meshes with the transmission gear (21). The bottom of the gear ring (22) is fixedly connected to a cleaning arc plate (24). A cleaning component (23) is fixedly connected to one side of the outer wall of the cleaning arc plate (24). The outer wall of the cleaning component (23) is in contact with the outer wall of the monitoring device body (2).

2. The monitoring device for elevator IoT equipment according to claim 1, characterized in that, One side of the mounting base (1) is in contact with one side of the elevator car panel (4), and a limiting port (6) is opened on one side of the elevator car panel (4). The outer walls of the two air collection hoppers (14) are movably connected to the inner wall of the limiting port (6).

3. The monitoring device for elevator IoT equipment according to claim 2, characterized in that, The mounting base (1) has a mounting opening (5) at the top. A fixing frame (10) is fixedly connected inside the mounting opening (5), and a drive motor (11) is fixedly connected to the inner wall of the fixing frame (10).

4. The monitoring device for elevator IoT equipment according to claim 3, characterized in that, The output shaft of the drive motor (11) is connected to a drive gear (12) via a coupling. A rack (3) is fixedly connected to the outer wall of the elevator car panel (4) facing the mounting base (1), and the drive gear (12) meshes with the rack (3).

5. A monitoring device for elevator IoT equipment according to claim 1, characterized in that, The mounting base (1) has a fixing opening (7) on its top inner wall. The top of the fixing seat (28) is in contact with the top inner wall of the fixing opening (7), and four positioning rods (29) are fixedly connected to the top inner wall of the fixing opening (7).

6. The monitoring device for an elevator Internet of Things (IoT) device according to claim 5, characterized in that, The top of the fixed base (28) is provided with four positioning holes (32), the inner walls of the four positioning holes (32) are in contact with the outer walls of the four positioning rods (29), and four fixing parts (30) are fixedly connected inside the fixing port (7). The bottom of each of the four fixing parts (30) has two fixing ports (33).

7. A monitoring device for elevator IoT equipment according to claim 6, characterized in that, Four mounting parts (37) are fixedly connected to the inner wall of one side of the mounting base. Each of the four mounting parts (37) is fixedly connected to a connecting rod (38). Each of the four connecting rods (38) is movably connected to a limiting part (34) on the outer wall. Each of the four limiting parts (34) is located inside the fixing port (7).

8. A monitoring device for elevator IoT devices according to claim 7, characterized in that, The outer walls of the four connecting rods (38) are fitted with torsion springs (36), and one end of each of the four torsion springs (36) is fixedly connected to one side of the inner wall of each of the four mounting parts (37).

9. A monitoring device for elevator IoT equipment according to claim 8, characterized in that, The other ends of the four torsion springs (36) are respectively fixedly connected to one side of the outer wall of the four limiting members (34).

10. A monitoring device for an elevator Internet of Things (IoT) device according to claim 7, characterized in that, Each of the four limiting members (34) has two protrusions (35) fixedly connected to its bottom, and the outer walls of the eight protrusions (35) are in contact with the inner walls of the eight fixed openings (33).

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