An apparatus for assembling an ultrasonic transducer

Abstract

The invention discloses a device for assembling an ultrasonic transducer, comprising: an upper bearing plate, a lower bearing plate is arranged below the upper bearing plate, and the upper bearing plate and the lower bearing plate are connected by support guide rods; a movable bearing plate, slidably mounted on the support guide rods and arranged between the upper bearing plate and the lower bearing plate; a three-jaw centering chuck, fixed on the movable bearing plate and used for centering the electrode plate, the transducer pressing plate and the piezoelectric ceramic; a pressure sensor; a perforated screw, arranged on the upper bearing plate, and a positioning hole for the perforated screw to pass through is formed on the upper bearing plate. The beneficial effects are as follows: The three-jaw centering chuck is used to position the transducer pressing plate, the piezoelectric ceramic and the electrode plate, so as to keep the concentricity between the horn and the above-mentioned components. At the same time, the pressure sensor is used for pressure monitoring, and then the transducer pre-tightening bolt is used for connection and locking, so that the pre-tightening force of each ultrasonic transducer can be ensured to be the same, and the production quality of the transducer can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic devices, and particularly relates to a device for assembling an ultrasonic transducer. Background Art

[0002] The ultrasonic transducer is an important component in the field of ultrasonic applications. The ultrasonic transducer mainly consists of a transducer pre-tightening bolt, a transducer pressure plate, a piezoelectric ceramic, an electrode plate, and a horn. Piezoelectric ceramics of various materials and specifications have strict pre-tightening force requirements. An appropriate pre-tightening force can maximize the ultrasonic energy output, the transducer is not easily aged or shattered, and the electrical performance can achieve the maximum benefit.

[0003] Currently, when assembling and producing ultrasonic transducers, a torque wrench is mostly used to apply a converted pre-tightening force to the piezoelectric ceramic. However, due to different batches, new and old conditions, or uneven quality of the pre-tightening screws, the pre-tightening force will change, affecting the performance of the transducer. In the mild case, the ultrasonic transducer and the ultrasonic generator do not match, and the frequency drifts. In the severe case, the power conversion rate is too low, generating excessive heat, and the piezoelectric ceramic is broken and fails.

[0004] After testing by testers, it is found that the key to transducer assembly is to ensure the concentricity of the components during installation, so that there is no space for ultrasonic leakage. The standard pre-tightening force of the piezoelectric ceramic enables the transducer to achieve the best conversion rate of electrical energy and mechanical energy. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for assembling an ultrasonic transducer to solve the above problems, that is, to solve the technical problem that in the prior art, during installation, the installation accuracy of the ultrasonic transducer is not optimized, and the uniformity of each ultrasonic transducer after installation cannot be guaranteed, affecting the performance of the transducer. Among the many technical solutions provided by the present invention, the preferred technical solution is to position the transducer pressure plate, piezoelectric ceramic, and electrode plate through a three-jaw centering chuck, so as to keep the horn concentric with the above components. At the same time, a pressure sensor is used for pressure monitoring, and then the transducer pre-tightening bolt is used for connection and locking, so as to ensure that the pre-tightening forces of each ultrasonic transducer are the same and improve the production quality of the transducer. The technical effects are described in detail below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The device for assembling an ultrasonic transducer provided by the present invention includes:

[0008] An upper support plate, a lower support plate is provided below the upper support plate, and the upper support plate and the lower support plate are connected by support guide rods;

[0009] A movable support plate, which is slidably installed on the support guide rods and is arranged between the upper support plate and the lower support plate;

[0010] The three-jaw centering chuck is fixed on the movable bearing plate and is used for centering the electrode plate, the transducer pressure plate and the piezoelectric ceramic.

[0011] The pressure sensor is fixedly installed on the lower bearing plate and is used for detecting the pressure state on the horn.

[0012] The perforated screw is arranged on the upper bearing plate. A positioning hole for the perforated screw to pass through is provided on the upper bearing plate, and a through hole for the transducer pre-tightening bolt to pass through is penetrated on the perforated screw.

[0013] Preferably, the number of the support guide rods is four, which are respectively arranged at the four corners of the upper bearing plate and the lower bearing plate.

[0014] Preferably, threaded holes for mating with the support guide rods are provided on the lower bearing plate, positioning holes for installing the support guide rods are penetrated on the upper bearing plate, and hexagon screws for positioning the support guide rods are provided above the upper bearing plate.

[0015] Preferably, guide holes corresponding to the positions of the support guide rods are provided on the movable bearing plate.

[0016] Preferably, a support spring is sleeved on the outer wall of the support guide rod, and the support spring is located between the movable bearing plate and the lower bearing plate.

[0017] The beneficial effects are as follows:

[0018] The transducer pressure plate, the piezoelectric ceramic and the electrode plate are positioned by the three-jaw centering chuck, so as to keep the horn concentric with the above-mentioned components. At the same time, the pressure sensor is used for pressure monitoring, and then the transducer pre-tightening bolt is used for connection and locking, so that the pre-tightening force of each ultrasonic transducer can be ensured to be the same, and the production quality of the transducer is improved. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is the three-dimensional structure view of the present invention Figure 1 ;

[0021] Figure 2 is the three-dimensional structure view of the present invention Figure 2 ;

[0022] Figure 3is the explosion structure view of the present invention Figure 1 ;

[0023] Figure 4 is the explosion structure view of the present invention Figure 2 。

[0024] The reference numerals are explained as follows:

[0025] 1. Lower bearing plate; 2. Support spring; 3. Movable bearing plate; 4. Guide hole; 5. Piezoelectric ceramic; 6. Support guide rod; 7. Upper bearing plate; 8. Hexagonal screw; 9. Perforated screw; 10. Transducer pre-tightening bolt; 11. Transducer pressing plate; 12. Electrode plate; 13. Horn; 14. Three-jaw centering chuck; 15. Pressure sensor. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present invention.

[0027] See Figures 1-4 as shown, the present invention provides a device for assembling an ultrasonic transducer, including:

[0028] An upper bearing plate 7 is provided below the upper bearing plate 7. Both the upper bearing plate 7 and the lower bearing plate 1 are horizontally arranged flat structures, which are convenient for processing. The upper bearing plate 7 and the lower bearing plate 1 are connected by support guide rods 6. The number of support guide rods 6 is four, which are respectively arranged at the four corners of the upper bearing plate 7 and the lower bearing plate 1, and can form a framework for support;

[0029] A movable bearing plate 3 is slidably installed on the support guide rod 6 and is arranged between the upper bearing plate 7 and the lower bearing plate 1. The structure dimensions of the movable bearing plate 3 correspond to those of the upper bearing plate 7 and the lower bearing plate 1, and it can slide horizontally on the support guide rod 6 between the upper bearing plate 7 and the lower bearing plate 1. The movable bearing plate 3 is provided with guide holes 4 corresponding to the positions of the support guide rods 6. The guide holes 4 and the support guide rods 6 are in sliding fit, which can maintain the stability when the movable bearing plate 3 and the support guide rods 6 move during the installation process and avoid jamming;

[0030] The three-jaw centering chuck 14 is fixed on the movable bearing plate 3 and is used to center the electrode plate 12, the transducer pressing plate 11 and the piezoelectric ceramic 5. The three-jaw centering chuck 14 is a common tool in the field of machining. It is mainly used to position circular workpieces. When in use, it can drive the small bevel gear to rotate through a wrench, and then make the bevel gear rotate. The three jaws are simultaneously driven to approach or withdraw from the center through the flat thread on the back of the bevel gear, so as to realize the clamping of the outer wall of the circular workpiece. Since the main components of the ultrasonic transducer include the horn 13, the electrode plate 12, the piezoelectric ceramic 5, the transducer pressing plate 11 and the transducer pre-tightening bolt 10, and since the sizes of the electrode plate 12, the piezoelectric ceramic 5 and the transducer pressing plate 11 correspond, it is necessary to use the transducer pre-tightening bolt 10 to fixedly install them on the horn 13. For the convenience of installation, the three-jaw centering chuck 14 designed in this application has a through groove in the middle for the bottom of the horn 13 to be inserted into. During the installation process, the horn 13 can be fixed by using this through groove. Since the top of the horn 13 is provided with a positioning ring extending outward, the positioning ring can be stuck at the edge of the through groove inside the three-jaw centering chuck 14 for positioning, reducing the installation difficulty. At the same time, the reason for adopting the through groove structure design in the three-jaw centering chuck 14 is to facilitate the pressure sensor 15 on the lower bearing plate 1 to extend into the through groove at the bottom of the movable bearing plate 3 and the three-jaw centering chuck 14, so as to contact the horn 13, thereby detecting the pressure of the transducer pressing plate 11, the piezoelectric ceramic 5 and the electrode plate 12 on the horn 13. Therefore, during the installation process, the three-jaw centering chuck 14 is used to position the electrode plate 12, the piezoelectric ceramic 5 and the transducer pressing plate 11, so as to ensure the concentricity between the electrode plate 12, the piezoelectric ceramic 5, the transducer pressing plate 11 and the horn 13, reduce the generation of wave leakage, and improve the use effect of the ultrasonic transducer;

[0031] The pressure sensor 15 is fixedly installed on the lower bearing plate 1 and is used to detect the pressure state on the horn 13. The pressure sensor 15 is fixed at the center of the lower bearing plate 1 through bolts and is concentric with the three-jaw centering chuck 14 in the middle of the movable bearing plate 3. The purpose is to ensure that the bottom of the movable bearing plate 3 contacts the pressure sensor 15, so as to detect the pressing force applied to the horn 13 during the installation process;

[0032] The perforated screw 9 is arranged on the upper bearing plate 7. A positioning hole for the perforated screw 9 to pass through is formed in the upper bearing plate 7. The positioning hole is a threaded hole, and the pressure applied by the perforated screw 9 to the transducer pressing plate 11 can be adjusted by rotating the perforated screw 9. A through hole for the transducer pre-tightening bolt 10 to pass through is formed through the center of the perforated screw 9. The aperture is slightly larger than the transducer pre-tightening bolt 10. With the structural design of the through hole, after the perforated screw 9 presses and positions the transducer pressing plate 11, the piezoelectric ceramic 5, and the electrode plate 12 on the horn 13, the transducer pre-tightening bolt 10 can be screwed into the interiors of the transducer pressing plate 11, the piezoelectric ceramic 5, and the electrode plate 12 and then cooperate with the internal threads of the horn 13 to achieve installation and fixation.

[0033] During the installation process, the operator inserts the horn 13 to be installed into the through groove inside the three-jaw centering chuck 14 for positioning installation, and then places the electrode plate 12, the piezoelectric ceramic 5, and the transducer pressing plate 11. At this time, the operator adjusts the jaws on the three-jaw centering chuck 14 to move towards the center, thereby pushing the electrode plate 12, the piezoelectric ceramic 5, and the transducer pressing plate 11 to move, so that the electrode plate 12, the piezoelectric ceramic 5, and the transducer pressing plate 11 are in a concentric state. Then, continuously tighten the perforated screw 9, so that the pressure generated during the downward movement of the perforated screw 9 is transmitted to the pressure sensor 15 arranged on the lower bearing plate 1 until the appropriate pressure value. At this time, the piezoelectric ceramic 5 of the transducer obtains the appropriate pre-tightening force and can exert the best transducer efficiency. Then, the transducer pre-tightening screw passes through the central through hole of the perforated screw 9 to lock the transducer pressing plate 11, the piezoelectric ceramic 5, the electrode plate 12, and the horn 13 together. At this time, the pressure transmitted to the pressure sensor 15 by tightening and pressurizing through the perforated screw 9 will be released until the pressure of the pressure sensor 15 returns to zero, and the assembly of the ultrasonic transducer is completed. The concentricity and pre-tightening force of the transducer are guaranteed, especially suitable for batch assembly, with completely consistent piezoelectric performance, which can significantly improve the unity of batch installation of ultrasonic transducers and improve product quality.

[0034] In another embodiment, threaded holes for cooperating with the support guide rod 6 to be installed are formed in the lower bearing plate 1. External threads for cooperating with the installation are provided at both ends of the support guide rod 6. When installing the support guide rod 6, the bottom of the support guide rod 6 can be inserted into the threaded hole on the lower bearing plate 1 for support, and then the movable bearing plate 3 is sleeved for installation. It should be noted that a positioning hole for installing the support guide rod 6 is formed through the upper bearing plate 7, and a hexagonal screw 8 for positioning the support guide rod 6 is provided above the upper bearing plate 7. A positioning hole is formed on the bottom surface of the upper bearing plate 7. The positioning hole is a counterbore, and a through hole with a smaller size is formed at the center of the positioning hole. A threaded portion corresponding to the size of the through hole is provided at the top of the support guide rod 6, which can limit the insertion height of the support guide rod 6 by using the counterbore during use and make the threaded portion at the top pass through the upper bearing plate 7, so as to facilitate fixation using the hexagonal screw 8.

[0035] In another embodiment, a support spring 2 is sleeved on the outer wall of the support guide rod 6. The support spring 2 is located between the movable bearing plate 3 and the lower bearing plate 1. The support spring 2 can lift the movable bearing plate 3, so that a gap is reserved between the three-jaw centering chuck 14 and the pressure sensor 15, avoiding contact between the pressure sensor 15 and the movable bearing plate 3 during the weighing process, so as to ensure the accuracy during the detection process.

[0036] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An apparatus for assembling an ultrasonic transducer, characterized in that: include: An upper deck (7), wherein a lower deck (1) is provided below the upper deck (7), and the upper deck (7) and the lower deck (1) are connected via a support guide rod (6); A movable support plate (3) is slidably mounted on the support guide rod (6) and is arranged between the upper support plate (7) and the lower support plate (1); A three-jaw centering chuck (14) fixed on the movable support plate (3) and used for centering the electrode sheet (12), the transducer pressure plate (11) and the piezoelectric ceramic (5); A pressure sensor (15) fixedly mounted on the lower bearing plate (1) for detecting a pressure state on the horn (13); A perforated screw (9) is arranged on the upper bearing plate (7); a positioning hole for the perforated screw (9) to pass through is formed on the upper bearing plate (7); a through hole for the transducer pre-tightening bolt (10) to pass through is formed through the perforated screw (9); a threaded hole for matching the support guide rod (6) for installation is formed on the lower bearing plate (1); a positioning hole for installing the support guide rod (6) is formed through the upper bearing plate (7); a hexagonal screw (8) for positioning the support guide rod (6) is formed above the upper bearing plate (7); a support spring (2) is sleeved on the outer wall of the support guide rod (6); the support spring (2) is located between the movable bearing plate (3) and the lower bearing plate (1).

2. The apparatus for assembling an ultrasonic transducer according to claim 1, characterized in that: There are four supporting guide rods (6), which are respectively arranged at the four corners of the upper bearing plate (7) and the lower bearing plate (1).

3. The apparatus for assembling an ultrasonic transducer according to claim 1, characterized in that: The movable support plate (3) is provided with a guide hole (4) corresponding to the position of the support guide rod (6).

Images