Ultrasonic cleaning machine with noise reduction structure

Abstract

The utility model discloses an ultrasonic cleaning machine with noise reduction structure, including ultrasonic cleaning machine body, the inside fixedly connected with the strengthened cleaning storehouse of cleaning tank of ultrasonic cleaning machine body, the inside installation of strengthened cleaning storehouse has the storage net basket, the top side swing joint of storage net basket has the sealing cover plate, has reduced the high -frequency noise that directly caused by cavitation impact greatly, has also reduced the vibration and noise radiation of the inner box and entire cleaning storehouse structure caused by this impact, and the rigidity and mass of structure can improve its natural frequency and reduce its vibration amplitude when being excited, thereby reducing the noise of structure vibration radiation, horizontal and vertical impact are separated and are absorbed, and the structure vibration noise is greatly reduced, and the air layer between double -layer glass forms acoustic spring, and high -frequency sound wave transmission is weakened, and residual noise hits glass fiber cotton board, and the porous structure converts medium -low frequency sound energy into heat energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic cleaning machine technology, and more specifically, to an ultrasonic cleaning machine with a noise reduction structure. Background Technology

[0002] Modern ultrasonic cleaners utilize high-frequency oscillation signals emitted by an ultrasonic generator to induce a "cavitation effect" in the liquid, generating powerful shock waves that peel away the dirt layer. Ultrasonic cleaners are widely used in the cleaning process of items. Ultrasonic waves propagate in the liquid, causing the liquid and the cleaning tank to vibrate together at the ultrasonic frequency. The liquid and the cleaning tank have their own inherent frequency when they vibrate, and this vibration frequency is the sound wave frequency, so people hear a buzzing sound.

[0003] In the prior art, ultrasonic cleaners generate vibrations during use, which can easily produce noise and affect the physical and mental health of operators. Application No. 202320700190.2 discloses an ultrasonic cleaner with a noise reduction structure, including a machine component, a noise reduction component, and a partition component. The partition component is provided at the top of the machine component, and the noise reduction component is provided at one end of the machine component. The noise reduction component includes a shell, a rubber plate, a sound-absorbing layer, a sound-absorbing layer, and a sound-absorbing ball. The rubber plate is provided at one end of the shell, the sound-absorbing layer is provided at one end of the rubber plate, and the sound-absorbing layer is installed at one end of the sound-absorbing layer. The above device only adds sound insulation and noise reduction structure to the shell of the ultrasonic cleaner, and the noise reduction and sound insulation effect is not comprehensive enough. In particular, the mesh basket for storing materials inside the ultrasonic cleaner is suspended inside the cleaning tank, and the ultrasonic vibration will cause the mesh basket to shake and produce strong noise.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes an ultrasonic cleaning machine with a noise reduction structure to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: An ultrasonic cleaner with a noise reduction structure includes an ultrasonic cleaner body. A reinforced cleaning chamber is fixedly connected inside the cleaning tank of the ultrasonic cleaner body. A storage basket is installed inside the reinforced cleaning chamber. A sealing cover is movably connected to the top side of the storage basket. The sealing cover is embedded inside the top opening of the cleaning tank of the ultrasonic cleaner body, and the top side of the reinforced cleaning chamber is lower than the top opening of the cleaning tank of the ultrasonic cleaner body. A reinforcing steel plate is fixedly connected to the bottom side of the ultrasonic cleaner body. Constraint damping adhesive is fixedly connected to the four corners of the reinforcing steel plate. A support base is fixedly connected to the bottom side of the reinforcing steel plate and the constraint damping adhesive. An installation frame is fitted and fixed to the outer side of the top of the storage basket.

[0007] Preferably, the enhanced cleaning chamber includes an outer box and an inner box. The bottom side of the inner wall of the outer box is fixedly connected to the inner box. Sliding rods are fixedly connected to both sides of the inner side of the outer box. A fixing block is sleeved and fixed in the middle of the sliding rod, and movable blocks are movably sleeved on the outer walls at both ends.

[0008] Preferably, the bottom side of the fixed block is fixedly connected to the two sides of the top of the inner box, and the front and rear sides of the movable block are respectively fixedly connected to the first springs. The first springs are all sleeved on the outer wall of the sliding rod, and the first springs on the outer sides are respectively fixedly connected to the two sides of the inner wall of the outer box.

[0009] Preferably, each movable block is provided with an adjusting rod at its top, and each adjusting rod has a hinge at its upper and lower ends. The bottom end of the adjusting rod is connected to the top of the movable block through the hinge, and the top end is connected to the bottom of the mounting frame through the hinge.

[0010] Preferably, connecting blocks are fixedly connected to both sides of the bottom of the mounting frame, and groove holes are drilled on the front and rear sides of the connecting blocks, with a guide rod movably passing through the inside of the connecting blocks.

[0011] Preferably, the guide rods pass through the outer ends of the groove holes on both sides and are fixedly connected to both sides of the inner wall of the outer box, and are located above the sliding rod. The outer wall of the sliding rod is symmetrically fitted with second springs, one end of the second spring is fixedly connected to the bottom of the inner wall of the groove hole, and the outer end is fixedly connected to both sides of the inner wall of the outer box.

[0012] Preferably, the sealing cover includes a first movable plate and a second movable plate, the second movable plate being disposed on the top side of the first movable plate, and the top of the first movable plate having a through-hole, and the lower part of the inner wall of the through-hole having a double-layer glass plate.

[0013] Preferably, a rubber sealing strip is fixedly connected to the outer edge of the second movable plate, and a glass fiber cotton board is fixedly connected to the bottom side of the second movable plate. Adjusting shafts are fixedly connected to the bottom sides of the first and second movable plates respectively. The adjusting shaft of the first movable plate is connected to the inner walls of the outer box through bearings, and the adjusting shaft of the second movable plate is connected to the upper sides of the convex opening through bearings. The double-layer glass plate is connected to the lower left side of the inner wall of the convex opening through hinges.

[0014] The beneficial effects of this utility model are as follows: it significantly reduces the high-frequency noise directly caused by cavitation impact, and also reduces the vibration and noise radiation of the inner box and the entire cleaning chamber structure caused by this impact. Increasing the rigidity and mass of the structure can increase its natural frequency and reduce its vibration amplitude when excited, thereby reducing the noise radiated by structural vibration. Horizontal and vertical impacts are separated and absorbed, significantly reducing structural vibration noise. The air layer between the double-layer glass forms an acoustic spring, weakening the transmission of high-frequency sound waves. The residual noise impacts the glass fiber cotton board, and the porous structure converts mid- and low-frequency sound energy into heat energy for consumption. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of an ultrasonic cleaner with a noise reduction structure according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the internal structure of the enhanced cleaning chamber of an ultrasonic cleaner with a noise reduction structure according to an embodiment of the present utility model. Figure 3 This is a schematic diagram of the disassembled structure of the storage basket of an ultrasonic cleaner with a noise reduction structure according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the unfolded structure of the sealing cover plate of an ultrasonic cleaner with a noise reduction structure according to an embodiment of the present utility model.

[0017] In the picture: 1. Ultrasonic cleaner body; 2. Reinforced cleaning chamber; 3. Storage basket; 4. Sealing cover; 5. Reinforcing steel plate; 6. Restraining damping rubber; 7. Support base; 8. Mounting frame; 9. Outer casing; 10. Inner casing; 11. Sliding rod; 12. Fixed block; 13. Movable block; 14. First spring; 15. Adjusting rod; 16. Connecting block; 17. Groove hole; 18. Guide rod; 19. Second spring; 20. First movable plate; 21. Second movable plate; 22. Convex opening; 23. Double-layer glass plate; 24. Rubber sealing strip; 25. Fiberglass wool board; 26. Adjusting shaft. Detailed Implementation

[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0019] According to an embodiment of the present invention, an ultrasonic cleaning machine with a noise reduction structure is provided.

[0020] Example 1 like Figure 1-4As shown, an ultrasonic cleaner with a noise reduction structure according to an embodiment of the present invention includes an ultrasonic cleaner body 1. A reinforced cleaning chamber 2 is fixedly connected inside the cleaning tank of the ultrasonic cleaner body 1. A storage basket 3 is installed inside the reinforced cleaning chamber 2. A sealing cover 4 is movably connected to the top side of the storage basket 3. The sealing cover 4 is embedded inside the top opening of the cleaning tank of the ultrasonic cleaner body 1, and the top side of the reinforced cleaning chamber 2 is lower than the top opening of the cleaning tank of the ultrasonic cleaner body 1. A reinforcing steel plate 5 is fixedly connected to the bottom side of the ultrasonic cleaner body 1. Constraint damping adhesive 6 is fixedly connected to the four corners of the reinforcing steel plate 5. A support base 7 is fixedly connected to the bottom side of the reinforcing steel plate 5 and the constraint damping adhesive 6. An installation frame is fixedly fitted onto the outer side of the top of the storage basket 3. The frame 8 and the enhanced cleaning chamber 2 include an outer casing 9 and an inner casing 10. The bottom side of the inner wall of the outer casing 9 is fixedly connected to the inner casing 10. Sliding rods 11 are fixedly connected to both sides of the inner side of the outer casing 9. A fixed block 12 is sleeved and fixed in the middle of the sliding rod 11, and movable blocks 13 are movably sleeved on the outer walls at both ends. The bottom side of the fixed block 12 is fixedly connected to the top edges of the inner casing 10. First springs 14 are fixedly connected to the front and rear sides of the movable blocks 13. The first springs 14 are all sleeved on the outer wall of the sliding rod 11, and the outer sides of the first springs 14 are fixedly connected to the inner walls of the outer casing 9. Each movable block 13 has an adjusting rod 15 on its top. The upper and lower ends of the adjusting rod 15 are respectively provided with hinges. The bottom end of the adjusting rod 15 is connected to the top of the movable block 13 through the hinge, and the top end is connected through... The hinge shaft is connected to the bottom of the mounting frame 8. Cleaning fluid is added to the inner chamber 10 of the reinforced cleaning tank. The items to be cleaned are placed in the storage basket 3, and the sealing cover 4 is closed. The ultrasonic cleaner body 1 is started. The ultrasonic generator inside generates a high-frequency electrical signal, which drives the piezoelectric transducer adhered to the bottom of the cleaning tank to vibrate. The transducer vibration is transmitted to the cleaning fluid through the bottom of the tank, generating an ultrasonic cavitation effect. The huge impact force generated when the bubbles collapse cleans the items. The vibration generated by the transducer is transmitted to the entire ultrasonic cleaner body 1. When the vibration is transmitted to the restraining damping rubber 6, the molecular chains inside it will be stretched, bent, and rubbed, converting the mechanical vibration energy into heat energy and dissipating it. Its elastic properties play a vibration isolation role, greatly attenuating the vibration transmitted to the bottom. The basket 3 is connected to the movable block 13 via the mounting frame 8 and adjusting rod 15. The movable block 13 can slide on the sliding rod 11, and its movement is constrained by the first springs 14 on both sides. The impact force is transmitted to the adjusting rod 15 through the mounting frame 8. The adjusting rod 15 acts as a lever, transmitting the force and pushing or pulling the movable block 13 along the sliding rod 11. The movement of the movable block 13 compresses and stretches the first springs 14 on both sides. The deformation of the springs stores most of the kinetic energy generated by the impact. The extension and contraction of the springs buffers the impact force, preventing this violent and transient impact force from being directly and rigidly transmitted to the inner box 10 and outer box 9 structure. After the impact force disappears or weakens,The restoring force of the first spring 14 returns the movable block 13 and the storage basket 3 system to near their initial positions, significantly reducing the high-frequency noise directly caused by cavitation impact. It also reduces the vibration and noise radiation of the inner casing 10 and the entire cleaning chamber 2 structure caused by this impact. The presence of the outer casing 9 and the inner casing 10 significantly increases the overall stiffness and mass of the cleaning chamber. Increasing the structural stiffness and mass raises its natural frequency and reduces its vibration amplitude when excited, thereby reducing the noise radiated by structural vibration.

[0021] Example 2 like Figure 1-4 As shown, an ultrasonic cleaner with a noise reduction structure according to an embodiment of the present invention includes an ultrasonic cleaner body 1. A reinforced cleaning chamber 2 is fixedly connected inside the cleaning tank of the ultrasonic cleaner body 1. A storage basket 3 is installed inside the reinforced cleaning chamber 2. A sealing cover 4 is movably connected to the top side of the storage basket 3. The sealing cover 4 is embedded inside the top opening of the cleaning tank of the ultrasonic cleaner body 1, and the top side of the reinforced cleaning chamber 2 is lower than the top opening of the cleaning tank of the ultrasonic cleaner body 1. A reinforcing steel plate 5 is fixedly connected to the bottom side of the ultrasonic cleaner body 1. Constraint damping adhesive 6 is fixedly connected to the four corners of the reinforcing steel plate 5. A support base 7 is fixedly connected to the bottom side of the reinforcing steel plate 5 and the constraint damping adhesive 6. An installation frame 8 is fixedly fitted onto the outer side of the top of the storage basket 3. Connecting... Block 16 has recessed holes 17 on both the front and rear sides. A guide rod 18 is movably connected inside the connecting block 16. The guide rod 18 passes through the outer ends of the recessed holes 17 on both sides and is fixedly connected to the inner walls of the outer box 9. It is located above the sliding rod 11. A second spring 19 is symmetrically sleeved on the outer wall of the sliding rod 11. One end of the second spring 19 is fixedly connected to the bottom of the inner wall of the recessed hole 17, and the outer end is fixedly connected to the inner walls of the outer box 9. The cavitation impact force pushes the storage basket 3, causing the mounting frame 8 and the connecting block 16 to slide along the guide rod 18. The second spring 19 is compressed and stretched, and directly absorbs the horizontal impact energy through the recessed holes 17. It assists the first spring 14 and the sliding rod 11 in suppressing the horizontal impact. The horizontal and vertical impacts are separated and absorbed, which greatly reduces the structural vibration noise.

[0022] Example 3 like Figure 1-4As shown, an ultrasonic cleaner with a noise reduction structure according to an embodiment of the present invention includes an ultrasonic cleaner body 1. A reinforced cleaning chamber 2 is fixedly connected inside the cleaning tank of the ultrasonic cleaner body 1. A storage basket 3 is installed inside the reinforced cleaning chamber 2. A sealing cover 4 is movably connected to the top side of the storage basket 3. The sealing cover 4 is embedded inside the top opening of the cleaning tank of the ultrasonic cleaner body 1, and the top side of the reinforced cleaning chamber 2 is lower than the top opening of the cleaning tank of the ultrasonic cleaner body 1. A reinforcing steel plate 5 is fixedly connected to the bottom side of the ultrasonic cleaner body 1. The reinforcing steel plate 5 has four bends... Constraint damping adhesive 6 is fixedly connected at the corners. A support base 7 is fixedly connected to the bottom side of the reinforcing steel plate 5 and the constraint damping adhesive 6. An installation frame 8 is fixedly fitted on the outer side of the top of the storage basket 3. The sealing cover plate 4 includes a first movable plate 20 and a second movable plate 21. The second movable plate 21 is set on the top side of the first movable plate 20. A convex opening 22 is provided through the top of the first movable plate 20. A double-layer glass plate 23 is provided below the inner wall of the convex opening 22. A rubber sealing strip 24 is fixedly connected to the outer edge of the second movable plate 21. A glass fiber cotton board 2 is fixedly connected to the bottom side of the second movable plate 21. 5. Adjusting shafts 26 are fixedly connected to the bottom sides of the first movable plate 20 and the second movable plate 21 respectively. The adjusting shafts 26 of the first movable plate 20 are connected to the inner sides of the outer casing 9 through bearings. The adjusting shafts 26 of the second movable plate 21 are connected to the upper sides of the inside of the convex opening 22 through bearings. The double-layer glass plate 23 is connected to the lower left side of the inner wall of the convex opening 22 through hinges. When the sealing cover 4 is closed, ultrasonic cleaning is performed, so that the first movable plate 20 is movably embedded into the top opening of the cleaning tank of the ultrasonic cleaner body 1 through the adjusting shafts 26 and abuts against the top side of the outer casing 9 and the second movable plate 21. 1. The adjusting shaft 26 is embedded inside the convex opening 22 at the top of the first movable plate 20. The rubber sealing strip 24 is tightly attached to the inner wall of the top opening of the cleaning tank of the main body to form an elastic sealing interface, blocking the noise leakage path. The air layer between the double-layer glass forms an acoustic spring, weakening the transmission of high-frequency sound waves. The residual noise impacts the glass fiber cotton board 25. The porous structure converts the mid- and low-frequency sound energy into heat energy for consumption. The double-layer glass plate 23 is opened and closed by a hinge, allowing small items to be directly inserted and removed, avoiding the noise explosion caused by fully opening the cover. The light transmittance of the glass allows real-time observation of the cleaning status, reducing the frequency of opening the cover.

[0023] In summary, with the help of the above-mentioned technical solution of this utility model, when using this device, cleaning fluid is added to the inner box 10 of the enhanced cleaning chamber, the items to be cleaned are placed in the storage basket 3, the sealing cover 4 is closed, and the ultrasonic cleaner body 1 is started. The ultrasonic generator inside generates a high-frequency electrical signal, which drives the piezoelectric transducer adhered to the bottom of the cleaning tank to vibrate. The transducer vibration is transmitted to the cleaning fluid through the bottom of the tank, generating an ultrasonic cavitation effect. The huge impact force generated when the bubbles collapse cleans the items. The vibration generated by the transducer is transmitted to the entire ultrasonic cleaner. The main body 1 and the basket 3 are connected to the movable block 13 via the mounting frame 8 and the adjusting rod 15. The movable block 13 can slide on the sliding rod 11, and its movement is constrained by the first springs 14 on both sides. The impact force is transmitted to the adjusting rod 15 through the mounting frame 8. The adjusting rod 15 acts as a lever, transmitting the force and pushing or pulling the movable block 13 along the sliding rod 11. The movement of the movable block 13 compresses and stretches the first springs 14 on both sides. The deformation of the springs stores most of the kinetic energy generated by the impact. The extension and contraction of the springs buffers the impact force and prevents this violent and transient impact force. The impact is directly and rigidly transmitted to the inner housing 10 and outer housing 9. After the impact force disappears or weakens, the restoring force of the first spring 14 will cause the movable block 13 and the storage basket 3 system to return to near their initial position. The cavitation impact force pushes the storage basket 3, causing the mounting frame 8 and connecting block 16 to slide along the guide rod 18. The second spring 19 is compressed and stretched, directly absorbing the horizontal impact energy through the groove hole 17, assisting the first spring 14 and sliding rod 11 in suppressing the horizontal impact. The sealing cover 4 is closed for ultrasonic cleaning, allowing the first movable plate 20 to pass through the adjusting shaft 26. The movable plate 21 is embedded in the top opening of the cleaning tank of the ultrasonic cleaner body 1 and abuts against the top side of the outer casing 9. The second movable plate 21 is embedded in the convex opening 22 at the top of the first movable plate 20 through the adjusting shaft 26. The rubber sealing strip 24 is tightly attached to the inner wall of the top opening of the cleaning tank of the main body to form an elastic sealing interface, blocking the noise leakage path. The air layer between the double-layer glass forms an acoustic spring, weakening the transmission of high-frequency sound waves. The residual noise impacts the glass fiber cotton board 25. The porous structure converts the mid- and low-frequency sound energy into heat energy for consumption. The double-layer glass plate 23 is opened and closed through the hinge, and small items can be directly inserted and removed.

[0024] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An ultrasonic cleaning machine having a noise reduction structure, comprising an ultrasonic cleaning machine body (1), characterized in that, The ultrasonic cleaner body (1) has a reinforced cleaning chamber (2) fixedly connected inside the cleaning tank. The reinforced cleaning chamber (2) has a storage basket (3) installed inside. The top side of the storage basket (3) is movably connected to a sealing cover (4). The sealing cover (4) is embedded inside the top opening of the cleaning tank of the ultrasonic cleaner body (1). The top side of the reinforced cleaning chamber (2) is lower than the top opening of the cleaning tank of the ultrasonic cleaner body (1). The bottom side of the ultrasonic cleaner body (1) is fixedly connected to a reinforcing steel plate (5). The four corners of the reinforcing steel plate (5) are respectively fixedly connected to a constraint damping rubber (6). The bottom side of the reinforcing steel plate (5) and the constraint damping rubber (6) are fixedly connected to a support base (7). The top outer side of the storage basket (3) is fitted with a fixed mounting frame (8).

2. The ultrasonic cleaning machine with noise reduction structure according to claim 1, characterized in that, The enhanced cleaning chamber (2) includes an outer box (9) and an inner box (10). The bottom side of the inner wall of the outer box (9) is fixedly connected to the inner box (10). Sliding rods (11) are fixedly connected to both sides of the inner side of the outer box (9). A fixing block (12) is sleeved and fixed in the middle of the sliding rod (11), and movable blocks (13) are movably sleeved on the outer walls at both ends.

3. The ultrasonic cleaning machine with noise reduction structure according to claim 2, characterized in that, The bottom side of the fixed block (12) is fixedly connected to the top two sides of the inner box (10), and the front and rear sides of the movable block (13) are respectively fixedly connected to the first spring (14). The first spring (14) is sleeved on the outer wall of the sliding rod (11), and the first spring (14) on the outer side is fixedly connected to the inner wall of the outer box (9) on both sides.

4. The ultrasonic cleaning machine with noise reduction structure according to claim 3, characterized in that, Each movable block (13) is provided with an adjustment rod (15) at its top. The upper and lower ends of the adjustment rod (15) are respectively provided with hinges. The bottom end of the adjustment rod (15) is connected to the top of the movable block (13) through the hinge, and the top end is connected to the bottom of the mounting frame (8) through the hinge.

5. The ultrasonic cleaning machine with noise reduction structure according to claim 4, characterized in that, The mounting frame (8) has connecting blocks (16) fixedly connected to both sides of its bottom. The connecting blocks (16) have groove holes (17) on their front and rear sides respectively. The connecting blocks (16) have guide rods (18) that can be moved through inside.

6. An ultrasonic cleaning machine with a noise reduction structure according to claim 5, characterized in that, The guide rod (18) passes through the outer ends of the groove holes (17) on both sides and is fixedly connected to the inner walls of the outer box (9). It is located above the sliding rod (11). The outer wall of the sliding rod (11) is symmetrically fitted with a second spring (19). The opposite end of the second spring (19) is fixedly connected to the bottom of the inner wall of the groove hole (17), and the outer end is fixedly connected to the inner walls of the outer box (9).

7. The ultrasonic cleaning machine with noise reduction structure according to claim 6, characterized in that, The sealing cover (4) includes a first movable plate (20) and a second movable plate (21). The second movable plate (21) is disposed on the top side of the first movable plate (20). The top of the first movable plate (20) is provided with a convex opening (22), and a double-layer glass plate (23) is provided below the inner wall of the convex opening (22).

8. The ultrasonic cleaning machine with noise reduction structure according to claim 7, characterized in that, A rubber sealing strip (24) is fixedly connected to the outer edge of the second movable plate (21), and a glass fiber cotton board (25) is fixedly connected to the bottom side of the second movable plate (21). An adjusting shaft (26) is fixedly connected to the bottom sides of the first movable plate (20) and the second movable plate (21). The adjusting shaft (26) of the first movable plate (20) is connected to the inner walls of the outer box (9) through bearings. The adjusting shaft (26) of the second movable plate (21) is connected to the upper sides of the inside of the convex opening (22) through bearings. The double-layer glass plate (23) is connected to the lower left side of the inner wall of the convex opening (22) through a hinge.

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