CN114289397A - Acoustic reflection top cover structure for ultrasonic cleaning device - Google Patents

Abstract

The invention discloses an acoustic reflection top cover structure for an ultrasonic cleaning device, and relates to the technical field of ultrasonic cleaning. On the basis of not changing the structure of the existing ultrasonic cleaning device, the top cover is additionally arranged, so that the acoustic energy dissipation caused by the fact that tension waves and the atomization effect of a gas-liquid interface are excited can be effectively reduced. The ultrasonic wave diffuse reflection device comprises an acoustic reflection top cover and a two-dimensional motion platform, wherein the bottom surface of the acoustic reflection top cover is a plane or is provided with a microstructure for enhancing the diffuse reflection of ultrasonic waves; the acoustic reflection top cover is driven by the two-dimensional motion platform and is placed in the cleaning solution of the cleaning tank. The top cover is simple in structure and convenient to install, and can conveniently and effectively improve the cleaning efficiency of the large ultrasonic cleaning device.

Description

A sound reflection top cover structure for ultrasonic cleaning device

technical field

The invention relates to the technical field of ultrasonic cleaning, in particular to an acoustic reflection top cover structure for an ultrasonic cleaning device.

Background technique

Ultrasonic cleaning technology first appeared in the 1930s, and its extensive research and application have never been interrupted since then. Ultrasonic cleaning is only a few decades old, but its superior performance and economy have been fully demonstrated. Ultrasonic cleaning has quickly become an integral part of the manufacturing process of many industries and products.

At present, the large-scale ultrasonic cleaning devices commonly used in the industry are mostly open-type without a top cover to facilitate the automatic transportation of cleaning objects, while a few large-scale ultrasonic cleaning devices with protective top covers are mostly considered. The sputtering phenomenon is harmful to operators, but there is also sound energy dissipation caused by surface tension waves and atomization effects at the gas-liquid interface.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention proposes a sound-reflecting top cover structure for an ultrasonic cleaning device. On the basis of not changing the structure of the existing ultrasonic cleaning device, by adding a top cover, the tension wave caused by the excitation of the gas-liquid interface can be effectively reduced And the sound energy dissipation caused by the atomization effect, the structure is simple, the installation is convenient, the cleaning efficiency of the ultrasonic cleaning device can be conveniently and effectively improved, and a more uniform cleaning effect can be obtained.

The technical scheme of the present invention is as follows: the acoustic reflection top cover structure includes an acoustic reflection top cover 1 and a two-dimensional motion platform, the acoustic reflection top cover 1 is provided with a suspension point 2, and the bottom surface of the acoustic reflection top cover 1 is A plane or a microstructure for enhancing the diffuse reflection of ultrasonic waves is provided; the two-dimensional motion platform is connected to the suspension point 2, and the acoustic reflection top cover 1 is driven to reciprocate along the X and Z directions through the two-dimensional motion platform, and is placed on the surface. into the cleaning solution of the cleaning tank. Thereby, the sound field boundary is formed by the top cover to limit the occurrence area of ultrasonic cavitation effect. The vertical distance between it and the transducer radiation surface of the ultrasonic cleaning device is the sound field distance, and the sound field distance can be adjusted with the up and down movement of the sound reflection top cover. , the adjustment range is from the top of the load basket to the surface of the cleaning solution.

The sound reflection top cover 1 is made of metal or polymer material.

The microstructure is in the shape of a plane, a periodic concave surface, a periodic convex surface or a large-curvature miniature periodic concave surface.

As shown in Figures 2a and 2b, when the microstructure has a periodic convex or concave shape, it is composed of a plurality of reflective ridges or reflective grooves evenly distributed on the bottom surface of the sound-reflecting top cover, which can diffusely reflect the sound energy. into the cleaning solution.

As shown in Figure 3-4, when the microstructure is in the shape of a large-curvature micro-periodic concave surface, it consists of a plurality of arc-shaped reflection pits evenly distributed on the bottom surface of the acoustic reflection top cover, and the pits are spherical with large curvature. (preferably, the radius of the large curvature sphere is equal to the liquid level of the cleaning liquid), so that the acoustic energy can be focused on the plane where the center of the sphere lies at a distant position. In this way, the surface tension waves formed by the ultrasonic wave passing through the liquid to the gas-liquid interface can be further reduced with the help of the above-mentioned microstructures of several different forms, and the dissipation of sound energy when the vibration of the interface is driven to produce the atomization effect can be better reduced. .

The two-dimensional motion platform includes a Z-direction drive mechanism fixedly connected to the frame and an X-direction drive mechanism connected to the suspension point 2. Both the Z-direction drive mechanism and the X-direction drive mechanism are linear drive mechanisms, such as hydraulic cylinders, Air cylinders or electric push rods, etc., such linear drive mechanisms all have fixed parts and movable parts, such as cylinder block and cylinder rod, piston cylinder and piston rod, base and screw rod, the fixed part of the Z-direction drive mechanism is fixedly connected to On the frame, the fixed part of the X-direction drive mechanism is fixedly connected to the movable part of the Z-direction drive mechanism, and the movable part of the X-direction drive mechanism is fixedly connected to the suspension point 2 on the acoustic reflection top cover 1 . In this way, the two-dimensional motion platform will be rigidly connected with the sound-reflecting top cover and will not easily shake. After the two-dimensional motion platform is connected with the acoustic reflection top cover, the acoustic reflection top cover can be controlled to move back and forth along the X direction or move up and down along the Z direction. The acoustic reflection top cover first stays on the ground outside the cleaning dish, waits for the basket loaded with the object to be cleaned to be placed in the cleaning dish, moves forward to the top of the cleaning dish, and moves downward to immerse in the cleaning liquid level.

The ultrasonic cleaning device includes a cleaning dish 6, a basket 5 and a lanyard 4. One end of the lanyard 4 is fixedly connected to the frame above the cleaning dish 6, and the other end is fixedly connected to the basket 5. The basket 5 is suspended in the cleaning dish 6 by the lanyard 4;

The acoustic reflection top cover 1 is also provided with a reserved slit 3 arranged along the X direction, and the width of the reserved slit 3 is greater than the outer diameter of the lanyard;

There are multiple lanyards 4, and the multiple lanyards are located on two XZ planes. There are also two reserved slits 3, and the centers of the two reserved slits 3 are located on the two XZ planes respectively. in plane. Therefore, when the acoustic reflection top cover moves in the X direction or the Z direction, the movement interference between the acoustic reflection top cover and the lanyard is avoided.

The working principle of the present invention is:

The ultrasonic transducer on the bottom of the large ultrasonic cleaning device works in the ultrasonic frequency range, and the resulting ultrasonic wave propagates in the cleaning liquid and causes cavitation effect;

The acoustic impedance of the top plate is greatly different from the acoustic impedance of the cleaning liquid, forming a hard acoustic field boundary at the junction, strengthening the ultrasonic reflection, and effectively reducing the acoustic energy dissipation caused by the tension wave that stimulates the gas-liquid interface and the atomization effect.

In addition, by adjusting the distance between the sound reflection top cover and the bottom surface of the cleaning dish, the up and down movement of the dense position of the cavitation bubbles is realized, so as to clean the objects to be cleaned evenly and efficiently.

Before working, first place the acoustic reflection top cover on the ground outside the cleaning dish, and on a plane higher than the top of the cleaning dish, wait for the basket loaded with the object to be cleaned to be placed in the cleaning dish, and move forward to the cleaning dish. Above the dish, dip down into the cleaning solution. At this time, the ultrasonic transducer works, and the sound reflection cover plate reciprocates periodically and moves up and down to achieve efficient and uniform cleaning.

The invention utilizes ultrasonic reflection to improve cleaning efficiency, and has the advantage that it does not need to change the structure of a large-scale ultrasonic cleaning device, only by adding a sound reflection top cover, reducing the sound energy loss at the gas-liquid interface caused by surface tension waves and atomization effects, increasing the The intensity of the sound field in the cleaning solution. By designing the microstructure of the bottom of the top cover, the diffuse reflection of ultrasonic waves can be enhanced, and higher dirt removal efficiency and more uniform cleaning effect can be obtained than the ultrasonic cleaning device without a rotating top cover. The top cover has the advantages of simple structure and convenient installation, which can conveniently and effectively improve the cleaning efficiency of the large-scale ultrasonic cleaning device. Further, the installation of the top cover is suitable for many types of ultrasonic cleaning devices, and has strong applicability and reliability. In particular, in the present invention, the distance between the top cover and the bottom of the cleaning dish can be adjusted, which can effectively avoid the waste of sound energy caused by the standing wave phenomenon for different operating frequencies.

Description of drawings

Fig. 1 is the structural representation of this case;

Figure 2a is a schematic view of the structure when the microstructure in this case is periodic convex;

Figure 2b is a schematic view of the structure when the microstructure in this case is periodic concave;

Figure 3 is a schematic diagram of the structure when the microstructure in this case is in the shape of a large-curvature micro-periodic concave surface;

Fig. 4 is the structural representation of the reflection pit in this case;

In the picture, 1-sound reflection top cover, 2-hanging point, 3-reserved gap, 4-lanyard, 5-carrying basket, 6-cleaning dish.

Detailed ways

In order to clearly illustrate the technical features of the present patent, the present patent will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

As shown in FIG. 1 , the ultrasonic cleaning device used in this embodiment includes: an acoustic reflection top cover 1 for reflecting ultrasonic waves; a two-dimensional motion platform for connecting the acoustic reflection top cover to realize forward and backward movement in the X direction and Z Up and down movement in the direction; a gap 3 is reserved to facilitate the passage of the hanging rope; the hanging rope 4 is used to hang the basket; the basket 5 is used to load the objects to be cleaned; pure water, etc.

As shown in FIG. 1 , the acoustic reflection top cover 1 is used for reflecting ultrasonic waves, forming a sound field boundary, and limiting the occurrence area of ultrasonic cavitation effects. The distance between the bottoms of the other cleaning dishes 6 is the sound field distance, and the sound field distance is adjustable, and the adjustment range is from the top of the basket to the surface of the cleaning liquid.

As shown in Figure 1, the acoustic reflection top cover has two reserved gaps 3, and the reserved gaps match the positions of the lanyards of the basket. When the sound-reflecting top cover moves, it does not contact the lanyard and the load basket, and does not cause the lanyard and the load basket to shake.

Before working, firstly place the acoustic reflection top cover 1 on the ground outside the cleaning dish 6 and on a plane higher than the top of the cleaning dish 6 . Waiting for the basket 5 loaded with the object to be cleaned, after being lowered into the cleaning dish by the sling 4, the acoustic reflection top cover 1 moves forward to the top of the cleaning dish under the action of the two-dimensional motion platform 2, and is immersed in the cleaning solution downward. liquid level.

Further, when the acoustic reflection top cover is immersed in the cleaning liquid, the ultrasonic transducer on the bottom surface of the large ultrasonic cleaning device works in the ultrasonic frequency range, and the generated ultrasonic waves propagate in the cleaning liquid and cause a cavitation effect.

Further, as shown in FIG. 1 , the acoustic reflection top cover 1 reciprocates up and down along the Z direction under the action of the two-dimensional motion platform 2 . The dense position of cavitation bubbles in the cleaning solution is moved up and down, so as to clean all parts of the object to be cleaned evenly and efficiently.

Implementation case 1:

The experimental operating environment is 201°C, and the operating frequency of the ultrasonic transducer is f=65.0KHz. The objects to be cleaned are metal parts, stubborn dirt such as organic oil on the surface of the parts. Select the ultrasonic reflection cover made of metal material, select the concave tooth acoustic focusing structure on the lower surface of the reflection cover, and apply ultrasonic waves for ultrasonic cleaning. Compared with the control group without ultrasonic reflective cover installed with the same cleaning time and power, the cleaning efficiency was increased by 37.3%.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: on the basis of not changing the structure of the existing ultrasonic cleaning device, by adding a top cover, the surface tension wave and the atomization effect can be effectively reduced. The sound energy dissipated by the sound-reflecting device is simple in structure and easy to install and rotate, which can effectively improve the cleaning efficiency of the ultrasonic cleaning device and obtain a more uniform cleaning effect. Strong reliability; in addition, the distance between the top cover and the bottom of the cleaning dish can be adjusted, which can effectively avoid the waste of sound energy caused by standing waves for different operating frequencies.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with the art to understand the content of the present invention and implement it, and cannot limit the scope of the present invention with this, all according to the spirit of the present invention. Substantially equivalent changes or modifications should be included within the protection scope of the present invention.

Claims (5)

1. The sound reflection top cover structure for the ultrasonic cleaning device is characterized by comprising a sound reflection top cover (1) and a two-dimensional motion platform, wherein suspension points (2) are arranged on the sound reflection top cover (1), and the bottom surface of the sound reflection top cover (1) is a plane or is provided with a microstructure for enhancing diffuse reflection of ultrasonic waves; the two-dimensional motion platform is connected with the suspension point (2), and the sound reflection top cover (1) is driven by the two-dimensional motion platform to reciprocate along the X direction and the Z direction.

2. An acoustic reflection roof construction for an ultrasonic cleaning device according to claim 1, characterized in that the acoustic reflection roof (1) is made of metal or polymer material.

3. The acoustic reflection roof structure for an ultrasonic cleaning apparatus of claim 2, wherein the microstructure is a flat surface, a periodic concave surface, a periodic convex surface, or a micro-periodic concave surface with a large curvature.

4. The acoustic reflection roof structure for the ultrasonic cleaning device according to claim 1, 2 or 3, wherein the two-dimensional motion platform comprises a Z-direction driving mechanism fixedly connected to the frame and an X-direction driving mechanism connected to the suspension point (2), the Z-direction driving mechanism and the X-direction driving mechanism are both linear driving mechanisms, a fixed part of the Z-direction driving mechanism is fixedly connected to the frame, a fixed part of the X-direction driving mechanism is fixedly connected to a movable part of the Z-direction driving mechanism, and the movable part of the X-direction driving mechanism is fixedly connected to the suspension point (2) on the acoustic reflection roof (1).

5. The acoustic reflection roof structure for the ultrasonic cleaning device according to claim 1, 2 or 3, wherein the ultrasonic cleaning device comprises a cleaning dish (6), a carrier basket (5) and a hanging rope (4), one end of the hanging rope (4) is fixedly connected to the frame above the cleaning dish (6), the other end of the hanging rope (4) is fixedly connected to the carrier basket (5), and the carrier basket (5) is suspended in the cleaning dish (6) through the hanging rope (4);

a reserved gap (3) arranged along the X direction is further formed in the sound reflection top cover (1), and the width of the reserved gap (3) is larger than the outer diameter of the hanging rope;

the hanging ropes (4) are multiple and are respectively positioned on two XZ planes, the reserved gaps (3) are also two, and the centers of the two reserved gaps (3) are respectively positioned in the two XZ planes.

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