A distributed optical fiber multi-probe liquid level sensing system

Abstract

The utility model relates to liquid level sensing system technical field discloses a kind of distributed optical fiber multi-probe liquid level sensing system, including measurer, the rear middle part of the outer wall of measurer is fixedly connected with fixed plate, the inner wall of fixed plate is slidably connected with sliding plate, the outer wall left and right sides of sliding plate are all set up with clamping hole, the bottom of sliding plate is fixedly connected with bottom plate, the inner wall top left and right sides of fixed plate are slidably connected with fixed round plate, the inner wall of fixed round plate is fixedly connected with clamping shaft, the top of multiple clamping shafts is fixedly connected with adjusting shaft, the outer wall of two clamping shafts is fixedly connected with spring on side away from each other. In the utility model, the rear side of the outer wall of measurer is fixed with fixed plate, while the inner wall of fixed plate is sliding with sliding plate, the convenience of disassembly and installation is realized, and the height can also be adjusted quickly, convenient for user to use.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid level sensing systems, and in particular to a distributed fiber optic multi-probe liquid level sensing system. Background Technology

[0002] Liquid level monitoring is a crucial element in many aspects of modern industrial production and daily life. Whether it's controlling the levels of crude oil and chemical raw materials in various storage tanks in the petrochemical industry, monitoring the real-time water levels of reservoirs and water storage ponds in the water conservancy and water affairs industry, or accurately monitoring the levels of reaction vessels and storage tanks in the food, beverage, and pharmaceutical industries, the accuracy and timeliness of liquid level information directly affect production safety, efficiency, and product quality. Furthermore, with the continuous improvement of industrial automation and intelligence, and the increasing emphasis on safe production and energy conservation and emission reduction across industries, higher demands are being placed on the performance and functionality of distributed fiber optic multi-probe liquid level sensing systems. Developing advanced distributed fiber optic multi-probe liquid level sensing systems with high spatial resolution, rapid response, and intelligent data processing and analysis capabilities has become an inevitable trend to meet the needs of modern industrial production and social development. These systems are expected to play a key role in more fields and drive technological upgrades and development in related industries.

[0003] A search revealed Chinese Patent Publication No. CN206321307U, which discloses a distributed fiber optic multi-probe liquid level sensing system, belonging to the field of fiber optic sensing. An ASE broadband light source is connected to a multiplexer optical switch via a circulator. The circulator guides the laser emitted by the ASE broadband light source into the multiplexer optical switch. One end of a transmission optical cable is connected to the multiplexer optical switch, and the other end is connected to a tapered fiber optic liquid level probe. The multiplexer optical switch is connected to a PD detector via the circulator. The multiplexer optical switch outputs the light signal reflected from the tapered fiber optic liquid level probe to the PD detector. The multiplexer optical switch emits the ASE broadband laser at time intervals into multiple transmission optical cables and outputs it to the tapered fiber optic liquid level probe, while simultaneously collecting the light... The advantages of time-division multiplexing of signals to PD detectors are: simple structure, convenient installation, low cost, suitable for large-scale long-distance deployment, and application in environments with strong electromagnetic interference, flammable and explosive materials, and lightning strikes. It also has good long-term stability and reliability. However, the above-mentioned liquid level sensing device fixing method is not only difficult to operate, but may also damage the stability of the dam structure. In the field of marine engineering, when used to monitor the liquid level of offshore platform oil storage tanks and nearshore aquaculture ponds, the device must withstand seawater corrosion and wave impact. Conventional mechanical fasteners are prone to failure, and underwater installation is costly and extremely risky. In urban underground pipe gallery systems, due to limited space and intersecting pipelines, the wiring and fixing of fiber optic sensing devices must avoid numerous obstacles, making construction extremely difficult. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a distributed fiber optic multi-probe liquid level sensing system, which aims to improve the problem that traditional liquid level sensing devices in the prior art are not easy to install and fix.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a distributed fiber optic multi-probe liquid level sensing system, comprising a measuring device, a fixed plate fixedly connected to the middle of the rear side of the outer wall of the measuring device, a sliding plate slidably connected to the inner wall of the fixed plate, engaging holes on the left and right sides of the outer wall of the sliding plate, a base plate fixedly connected to the bottom of the sliding plate, fixed circular plates slidably connected to the top left and right sides of the inner wall of the fixed plate, engaging shafts fixedly connected to the inner wall of the fixed circular plates, adjusting shafts fixedly connected to the top of multiple engaging shafts, springs fixedly connected to the outer walls of two engaging shafts on opposite sides, the other end of the springs fixed to the top of the inner wall of the fixed plate, and a measuring mechanism provided at the bottom of the measuring device for measuring liquid level information.

[0006] The above technical solution involves a fixed plate fixedly connected to the middle of the rear side of the outer wall of the measuring instrument. A sliding plate is slidably connected to the inner wall of the fixed plate. To ensure the stability of the sliding plate, locking holes are provided on both the left and right sides of its outer wall. In addition, a base plate is fixedly connected to the bottom of the sliding plate, which provides additional support for the sliding plate and ensures its stability during operation. Fixed circular plates are slidably connected to the top left and right sides of the inner wall of the fixed plate. Locking shafts are fixedly connected to the inner walls of these fixed circular plates. An adjusting shaft is fixedly connected to the top of the locking shaft, which is used to adjust the measuring range of the measuring instrument.

[0007] As a further description of the above technical solution:

[0008] The measuring mechanism includes a fixed shaft, the inner wall of which is rotatably connected to the bottom of the measuring device. Optical fibers are fixedly connected to both the left and right sides of the inner wall of the fixed shaft, and probes are fixedly connected to the other ends of the multiple optical fibers. A connecting rod is fixedly connected to the left side of the outer wall of the measuring device, and fixed sleeves are fixedly connected to both the left and right sides of the outer wall of the connecting rod. Optical wave devices are fixedly connected to the inner walls of the multiple fixed sleeves, and transmitting tubes are fixedly connected to the bottom of the optical wave devices.

[0009] The above technical solution involves fixing multiple optical fiber lines to both sides of the inner wall of the fixed shaft. The other end of these optical fiber lines, that is, the end away from the fixed shaft, is fixedly connected to a corresponding probe. In addition, a connecting rod is fixedly connected to the left side of the outer wall of the measuring device. An optical wave device is a device that can emit or receive light waves and is usually used in the field of optical measurement. Finally, a transmitting tube is fixedly connected to the bottom of the optical wave device. The transmitting tube is a device used to emit light waves.

[0010] As a further description of the above technical solution:

[0011] Protective plates are fixedly connected to the upper and lower ends of the rear side of the outer wall of the fixing plate, and flexible strips are fixedly connected to the left and right ends of the outer wall of the fixing plate.

[0012] The above technical solution involves fixing protective plates to both the upper and lower ends of the outer wall of the fixed plate, which can effectively protect the rear side of the fixed plate from external impacts and wear. In addition, to enhance the stability and durability of the fixed plate, soft strips are fixedly connected to both the left and right ends of its outer wall.

[0013] As a further description of the above technical solution:

[0014] Protective pads are fixedly connected to the four corners of the top of the base plate, and protective pads are fixedly connected to the left and right ends of the top front side of the outer wall of the measuring device.

[0015] The above technical solution involves fixing protective pads at the four corners of the top of the base plate. These protective pads are designed to protect the base plate from damage during use.

[0016] As a further description of the above technical solution:

[0017] Protective strips are fixedly connected to the upper and lower ends of the front side of the outer wall of the measuring device, and buttons are provided on the left and right sides of the bottom front side of the outer wall of the measuring device.

[0018] The above technical solution involves fixing protective strips at both the upper and lower ends of the front side of the outer wall of the measuring instrument to protect it from external impacts or scratches during use.

[0019] As a further description of the above technical solution:

[0020] Protective plates are fixedly connected to the front and rear sides of the top of the measuring device, and square pads are fixedly connected to the top left and right sides of the outer wall of the measuring device near the edge.

[0021] The above technical solution involves fixing protective plates to both the front and rear sides of the top of the measuring instrument, which effectively protects the front and rear sides of the top of the measuring instrument from damage by external factors, thereby ensuring the stability and accuracy of the measuring instrument.

[0022] As a further description of the above technical solution:

[0023] A handle is fixedly connected to the center of the top surface of the measuring device, and a protective sleeve is fixedly connected to the outer wall of the handle.

[0024] The above technical solution involves a handle fixedly connected to the center of the top surface of the measuring instrument. This handle not only facilitates user operation but also provides additional safety during use.

[0025] As a further description of the above technical solution:

[0026] The measuring device has interfaces fixedly connected to the upper and lower ends of the right side of its outer wall, and soft pads fixedly connected to the left and right sides of the bottom of its outer wall near the edge.

[0027] The above technical solution involves fixing interfaces at both the top and bottom right sides of the measuring device's outer wall. In addition, to ensure the stability and durability of the measuring device during use, soft pads are also fixedly connected to the bottom left and right sides of the outer wall near the edges.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, a fixing plate is fixed to the rear side of the outer wall of the measuring device, and a sliding plate slides on the inner wall of the fixing plate. Fixing circular plates are slidably connected to the top left and right sides of the inner wall of the fixing plate. At the same time, a spring fixed to the outer wall of the fixing circular plate can squeeze the fixing circular plate under elastic action, so that it can drive the locking shaft on the inner wall to lock into the inner wall of the corresponding locking hole opened on the inner wall of the sliding plate, thereby driving the fixing circular plate to disengage from the inner wall of the locking hole, realizing the convenience of disassembly and installation, and also enabling quick height adjustment for user convenience.

[0030] 2. In this utility model, a light wave generator is fixed on both the left and right sides of the outer wall of the connecting rod fixed on the left side of the measuring device. The light wave generator can generate light waves that are transmitted to the transmitting tube. The transmitting tube can emit light waves at multiple angles in the water. An optical fiber is fixed at the bottom of the fixed shaft that is rotatably connected to the bottom of the measuring device. The probe fixed at the other end of the optical fiber can collect the light waves emitted by the light wave generator after reflection and transmit them into the interior of the measuring device to measure the liquid level. The simple operation meets the usage requirements. Attached Figure Description

[0031] Figure 1 This is a three-dimensional view of the front of the measuring device of a distributed fiber optic multi-probe liquid level sensing system proposed in this utility model.

[0032] Figure 2 This is a structural diagram of a sliding plate in a distributed fiber optic multi-probe liquid level sensing system proposed in this utility model.

[0033] Figure 3 This is a diagram of the fiber optic cable structure of a distributed fiber optic multi-probe liquid level sensing system proposed in this utility model.

[0034] Figure 4 This is a partial structural diagram of the optical waveguide of a distributed fiber optic multi-probe liquid level sensing system proposed in this utility model.

[0035] Figure 5This is a schematic diagram of the fixed plate structure of a distributed fiber optic multi-probe liquid level sensing system proposed in this utility model.

[0036] Legend:

[0037] 1. Measuring instrument; 2. Measuring mechanism; 201. Fixed shaft; 202. Fiber optic cable; 203. Probe; 204. Connecting rod; 205. Fixing sleeve; 206. Optical wave device; 207. Transmitting tube; 3. Fixing plate; 4. Sliding plate; 5. Fixing circular plate; 6. Engaging shaft; 7. Adjusting shaft; 8. Spring; 9. Engaging hole; 10. Base plate; 11. Protective plate; 12. Soft strip; 13. Protective pad; 14. Interface; 15. Square pad; 16. Soft pad; 17. Protective plate; 18. Handle; 19. Protective sleeve; 20. Protective pad; 21. Protective strip; 22. Button. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Please see the appendix Figure 3 - Appendix Figure 5 This utility model provides an embodiment of a distributed fiber optic multi-probe liquid level sensing system, including a measuring device 1. A fixed plate 3 is fixedly connected to the middle of the rear side of the outer wall of the measuring device 1. A sliding plate 4 is slidably connected to the inner wall of the fixed plate 3. The left and right sides of the outer wall of the sliding plate 4 are provided with locking holes 9. A bottom plate 10 is fixedly connected to the bottom of the sliding plate 4. Fixed circular plates 5 are slidably connected to the top left and right sides of the inner wall of the fixed plate 3. A locking shaft 6 is fixedly connected to the inner wall of the fixed circular plate 5. An adjusting shaft 7 is fixedly connected to the top of the multiple locking shafts 6. A spring 8 is fixedly connected to the outer wall of two locking shafts 6 on the side away from each other. The other end of the spring 8 is fixed to the top of the inner wall of the fixed plate 3. A measuring mechanism 2 is provided at the bottom of the measuring device 1. In order to ensure the stability of the locking shafts 6 during the adjustment process, springs 8 are fixedly connected to the outer wall of two locking shafts 6 on the side away from each other. The other end of these springs 8 is fixed to the top of the inner wall of the fixed plate 3. The measuring mechanism 2 is used to measure liquid level information through the elastic force of the springs 8.

[0040] Specifically, a fixing plate 3 is fixedly connected to the middle of the rear side of the outer wall of the measuring device 1. A sliding plate 4 is slidably connected to the inner wall of the fixing plate 3. To ensure the stability of the sliding plate 4, locking holes 9 are provided on both the left and right sides of its outer wall. In addition, a base plate 10 is fixedly connected to the bottom of the sliding plate 4. The base plate 10 provides additional support for the sliding plate 4 to ensure its stability during operation. Fixed circular plates 5 are slidably connected to the top left and right sides of the inner wall of the fixing plate 3. Locking shafts 6 are fixedly connected to the inner walls of these fixed circular plates 5. An adjusting shaft 7 is fixedly connected to the top of the locking shaft 6. The adjusting shaft 7 is used to adjust the measuring range of the measuring device 1. Finally, a measuring mechanism 2 is provided at the bottom of the measuring device 1. The measuring mechanism 2 is used to measure liquid level information and provide users with accurate liquid level data.

[0041] Please see the appendix Figure 1 - Appendix Figure 3 The measuring mechanism 2 includes a fixed shaft 201, the inner wall of which is rotatably connected to the bottom of the measuring device 1. Fiber optic cables 202 are fixedly connected to the left and right sides of the inner wall of the fixed shaft 201. Probes 203 are fixedly connected to the other ends of the multiple fiber optic cables 202. A connecting rod 204 is fixedly connected to the left side of the outer wall of the measuring device 1. Fixing sleeves 205 are fixedly connected to the left and right sides of the outer wall of the connecting rod 204. Optical wave devices 206 are fixedly connected to the inner walls of the multiple fixing sleeves 205. Transmitting tubes 207 are fixedly connected to the bottom of the optical wave devices 206. Multiple fixing sleeves 205 are also fixedly connected to the left and right sides of the outer wall of the connecting rod 204. Optical wave devices 206 are fixedly connected to the inner walls of these fixing sleeves 205.

[0042] Specifically, multiple optical fiber lines 202 are fixedly connected to both sides of the inner wall of the fixed shaft 201. The other end of these optical fiber lines 202, that is, the end away from the fixed shaft 201, is fixedly connected to a corresponding probe 203. In addition, a connecting rod 204 is fixedly connected to the left side of the outer wall of the measuring device 1. The optical wave device 206 is a device that can emit or receive light waves, usually used in the field of optical measurement. Finally, a transmitting tube 207 is fixedly connected to the bottom of the optical wave device 206. The transmitting tube 207 is a device for emitting light waves. It can emit the light waves generated by the optical wave device 206 for various light wave-related applications.

[0043] Please see the appendix Figure 2 - Appendix Figure 4Protective plates 11 are fixedly connected to the upper and lower ends of the rear side of the outer wall of the fixed plate 3. Flexible strips 12 are fixedly connected to the left and right ends of the outer wall of the fixed plate 3. Protective pads 13 are fixedly connected to the four corners of the top of the bottom plate 10. Protective pads 20 are fixedly connected to the left and right ends of the top front side of the outer wall of the measuring device 1. Protective strips 21 are fixedly connected to the upper and lower ends of the front front side of the measuring device 1. Protective pads 20 are fixedly connected to the left and right ends of the top front side of the outer wall of the measuring device 1. These protective pads 20 can prevent the top of the measuring device 1 from being impacted during use. Buttons 22 are provided on the left and right sides of the bottom front side of the outer wall of the measuring device 1.

[0044] Specifically, protective plates 11 are fixedly connected to the upper and lower ends of the rear side of the outer wall of the fixed plate 3. This can effectively protect the rear side of the fixed plate 3 from external impacts and wear. At the same time, soft strips 12 are fixedly connected to the left and right ends of the outer wall of the fixed plate 3. These soft strips 12 can act as a buffer to reduce the impact that may occur during the movement or use of the equipment. In addition, protective pads 13 are fixedly connected to the four corners of the top of the base plate 10. These protective pads 13 can protect the corners of the base plate 10 from damage and also increase the stability and durability of the equipment. Meanwhile, protective strips 21 are fixedly connected to the upper and lower ends of the front side of the outer wall of the measuring device 1. These protective strips 21 can effectively protect the upper and lower parts of the front side of the measuring device 1 from scratches or impacts. Finally, buttons 22 are provided on the left and right sides of the bottom front side of the outer wall of the measuring device 1. These buttons 22 are convenient for users to operate and can withstand a certain amount of pressure to ensure reliability during use.

[0045] Please see the appendix Figure 1 - Appendix Figure 3 Protective plates 17 are fixedly connected to the top front and back sides of the measuring device 1. Square pads 15 are fixedly connected to the top left and right sides of the outer wall of the measuring device 1 near the edge. A handle 18 is fixedly connected to the center of the top surface of the measuring device 1. A protective sleeve 19 is fixedly connected to the outer wall of the handle 18. Interfaces 14 are fixedly connected to the upper and lower ends of the right side of the outer wall of the measuring device 1. In order to protect the user and the equipment, a protective sleeve 19 is fixedly connected to the outer wall of the handle 18. The protective sleeve 19 can reduce the damage to the handle 18 caused by wear or impact during use. In addition, interfaces 14 are fixedly connected to the upper and lower ends of the right side of the outer wall of the measuring device 1, which enhances its functionality and applicability. Soft pads 16 are fixedly connected to the bottom left and right sides of the outer wall of the measuring device 1 near the edge.

[0046] Specifically, protective plates 17 are fixedly connected to the front and rear sides of the top of the measuring device 1. These protective plates 17 can effectively protect the front and rear areas of the top of the measuring device 1 and prevent damage caused by accidental collisions or friction during use. In addition, square pads 15 are fixedly connected to the top left and right sides of the outer wall of the measuring device 1 near the edge. These square pads 15 not only increase the stability of the measuring device 1, but also prevent the measuring device 1 from causing scratches or damage to the surface when used on hard surfaces. A handle 18 is fixedly connected to the center of the top surface of the measuring device 1. The design of this handle 18 allows users to easily carry and move the measuring device 1. Finally, in order to ensure the stability of the measuring device 1 when used on various surfaces and to protect the bottom surface, soft pads 16 are fixedly connected to the bottom left and right sides of the outer wall of the measuring device 1 near the edge. These soft pads 16 can effectively absorb vibration and reduce damage to the bottom of the measuring device 1, while also preventing scratches or damage to the surface when used on hard surfaces.

[0047] Working principle: A fixing plate 3 is fixed to the rear side of the outer wall of the measuring device 1, and a sliding plate 4 slides on the inner wall of the fixing plate 3. Fixing circular plates 5 are slidably connected to the top left and right sides of the inner wall of the fixing plate 3. A spring 8 fixed to the outer wall of the fixing circular plate 5 can compress the fixing circular plate 5 under elastic action, so that it can drive the locking shaft 6 on the inner wall to lock into the corresponding locking hole 9 opened on the inner wall of the sliding plate 4. This achieves the fixing of the measuring device 1 while adjusting its height within a certain range. The adjusting shaft 7 fixed to the top of the fixing circular plate 5 can slide on the top of the measuring device 1, so that it can drive the fixing circular plate 5 to disengage from the inner wall of the locking hole 9, realizing convenient disassembly and installation, and also enabling quick height adjustment for user convenience.

[0048] The connecting rod 204 fixed on the left side of the measuring device 1 has light wave generators 206 fixed on both sides of its outer wall. The light wave generators 206 can generate light waves that are transmitted to the transmitting tube 207. The transmitting tube 207 can emit its light waves at multiple angles in the water. At the bottom of the measuring device 1, the fixed shaft 201 is rotatably connected to the bottom and has an optical fiber 202 fixed at the bottom. The probe 203 fixed at the other end of the optical fiber 202 can collect the light waves emitted by the light wave generators 206 after reflection and transmit them into the measuring device 1 to measure the liquid level. The operation is simple and meets the usage requirements.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A distributed fiber optic multi-probe liquid level sensing system, comprising a measuring device (1), characterized in that: A fixed plate (3) is fixedly connected to the middle of the rear side of the outer wall of the measuring device (1). A sliding plate (4) is slidably connected to the inner wall of the fixed plate (3). A locking hole (9) is opened on the left and right sides of the outer wall of the sliding plate (4). A base plate (10) is fixedly connected to the bottom of the sliding plate (4). A fixed circular plate (5) is slidably connected to the top left and right sides of the inner wall of the fixed plate (3). A locking shaft (6) is fixedly connected to the inner wall of the fixed circular plate (5). An adjusting shaft (7) is fixedly connected to the top of multiple locking shafts (6). A spring (8) is fixedly connected to the outer wall of two locking shafts (6) on the side away from each other. The other end of the spring (8) is fixed to the top of the inner wall of the fixed plate (3). A measuring mechanism (2) is provided at the bottom of the measuring device (1). The measuring mechanism (2) is used to measure liquid level information.

2. The distributed fiber optic multi-probe liquid level sensing system according to claim 1, characterized in that: The measuring mechanism (2) includes a fixed shaft (201), the inner wall of which is rotatably connected to the bottom of the measuring device (1). Fiber optic cables (202) are fixedly connected to the left and right sides of the inner wall of the fixed shaft (201). Probes (203) are fixedly connected to the other ends of the multiple fiber optic cables (202). A connecting rod (204) is fixedly connected to the left side of the outer wall of the measuring device (1). Fixing sleeves (205) are fixedly connected to the left and right sides of the outer wall of the connecting rod (204). Optical wave devices (206) are fixedly connected to the inner walls of the multiple fixing sleeves (205). A transmitting tube (207) is fixedly connected to the bottom of each optical wave device (206).

3. The distributed fiber optic multi-probe liquid level sensing system according to claim 1, characterized in that: Protective plates (11) are fixedly connected to the upper and lower ends of the rear side of the outer wall of the fixed plate (3), and flexible strips (12) are fixedly connected to the left and right ends of the outer wall of the fixed plate (3).

4. The distributed fiber optic multi-probe liquid level sensing system according to claim 1, characterized in that: Protective pads (13) are fixedly connected to the four corners of the top of the base plate (10), and protective pads (20) are fixedly connected to the left and right ends of the top front side of the outer wall of the measuring device (1).

5. The distributed fiber optic multi-probe liquid level sensing system according to claim 1, characterized in that: The measuring device (1) has protective strips (21) fixedly connected to the upper and lower ends of the front side of the outer wall, and buttons (22) are provided on the left and right sides of the bottom of the front side of the outer wall.

6. The distributed fiber optic multi-probe liquid level sensing system according to claim 1, characterized in that: Protective plates (17) are fixedly connected to the front and rear sides of the top of the measuring device (1), and square pads (15) are fixedly connected to the left and right sides of the top of the outer wall of the measuring device (1) near the edge.

7. The distributed fiber optic multi-probe liquid level sensing system according to claim 1, characterized in that: A handle (18) is fixedly connected to the center of the top surface of the measuring instrument (1), and a protective sleeve (19) is fixedly connected to the outer wall of the handle (18).

8. The distributed fiber optic multi-probe liquid level sensing system according to claim 1, characterized in that: The measuring device (1) has an interface (14) fixedly connected to the upper and lower ends of the right side of the outer wall, and a soft pad (16) fixedly connected to the bottom left and right sides of the outer wall near the edge.

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