Ultrasonic transducer assembly tool and assembly method

Abstract

The present invention discloses an ultrasonic transducer assembly tool and assembly method. The assembly tool includes an assembly body having a cylindrical cavity and a front cover flange connected to the assembly body. The assembly body includes a first end face and a second end face. The first end face is provided with a step adapted to the front cover of the ultrasonic transducer. A pressure ring is also provided between the front cover of the ultrasonic transducer and the front cover flange. The inner wall of the cavity is provided with four through grooves that are evenly distributed and parallel to the axis of the cavity. The depth of the through grooves is adapted to the length of the electrode pins of the ultrasonic transducer. The through grooves are evenly distributed along the circumference of the cavity. The middle part of the front cover flange has a through threaded hole. A hollow screw is threaded in the threaded hole so that the pressure ring is tightened by the hollow screw. The assembly device and assembly method can ensure the coaxiality between the front cover, rear cover, and piezoelectric ceramic during assembly of the ultrasonic transducer, thereby improving the assembly quality.

Description

Technical Field

[0001] The present invention relates to an assembly technology of an ultrasonic transducer, and in particular to an assembly tool and an assembly method of an ultrasonic transducer. Background Art

[0002] An ultrasonic transducer is a device that converts electrical energy into ultrasonic frequency mechanical vibration energy. Based on the type of vibrator, it can be divided into magnetostrictive and electrostrictive types. The vibrator element of the electrostrictive type is piezoelectric ceramic. In actual engineering applications, the sandwich piezoelectric ultrasonic transducer is the most widely used configuration. In this configuration, the main components include a front cover, piezoelectric ceramics, electrode sheets, a rear cover, and preload screws. The front and rear covers clamp the piezoelectric ceramics and electrode sheets together using preload screws. The piezoelectric ceramics vibrate under pressure and transmit the vibration energy to the actuator through the end face of the front cover.

[0003] The assembly process of a sandwich piezoelectric ultrasonic transducer is extremely critical. The quality of assembly directly affects various transducer performance parameters, such as resonant frequency, static capacitance, and impedance. These parameters directly affect the transducer's output performance and operating stability. Poor assembly quality can even cause the piezoelectric ceramic to crack. The coaxiality between the front cover, rear cover, and piezoelectric ceramic is a decisive factor affecting assembly quality. Existing transducer assembly devices and methods have complex structures, involve many parts, and have complex assembly methods. As a result, the coaxiality between the front cover, rear cover, and piezoelectric ceramic cannot be accurately guaranteed. Summary of the Invention

[0004] In order to address the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide an ultrasonic transducer assembly tool and assembly method. The assembly device and assembly method can ensure the coaxiality between the front cover plate, rear cover plate, and piezoelectric ceramics during assembly of the ultrasonic transducer, thereby improving the assembly quality.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an ultrasonic transducer assembly tool, including an assembly body having a cylindrical cavity and a front cover flange connected to the assembly body, wherein the cavity is distributed along the axis of the assembly body and passes through the assembly body, and the assembly body includes a first end face and a second end face;

[0006] The first end surface is provided with a step adapted to the front cover of the ultrasonic transducer, so that the front cover of the ultrasonic transducer is just stuck in the step;

[0007] A pressure ring is also provided between the front cover plate of the ultrasonic transducer and the front cover plate flange;

[0008] The inner wall of the cavity is provided with four through grooves that are evenly distributed and parallel to the axis of the cavity, the depth of the through grooves being adapted to the length of the electrode pins of the ultrasonic transducer, and the through grooves being evenly distributed along the circumference of the cavity;

[0009] A threaded hole is provided in the middle of the front cover flange, and a hollow screw is threadedly connected in the threaded hole, so that the pressure ring is tightened by the hollow screw.

[0010] Optionally, a plurality of protrusions are provided in the step, and grooves adapted to the protrusions are provided on the end surface of the front cover flange, and the protrusions are clamped in the grooves;

[0011] The protrusions are evenly distributed along the circumference of the step, and the protrusions and the through grooves are staggered.

[0012] By adopting the above technical solution, compared with the prior art, the present invention adopts an assembly having a step that matches the front cover flange. During assembly, the front cover can be fastened on the first end face first, and then the piezoelectric ceramic and the rear cover can be fixed on the second end face, thereby ensuring the coaxiality between the front cover, the rear cover and the piezoelectric ceramic.

[0013] The present invention also provides an ultrasonic transducer assembly method, which comprises the following steps:

[0014] Inserting the front cover of the ultrasonic transducer from the first end face of the assembly;

[0015] Put the pressure ring into the ultrasonic transducer, and then put the front cover flange into the ultrasonic transducer, and make the front cover flange just stuck in the step;

[0016] Use screws to securely connect the front cover flange to the first end face;

[0017] Insert the hollow screw into the ultrasonic transducer and screw it into the threaded hole of the front cover flange;

[0018] Tighten the hollow screw so that the hollow screw compresses the pressure ring, and the pressure ring presses the front cover of the ultrasonic transducer;

[0019] Insert the piezoelectric ceramic, the electrode sheet and the back cover into the cavity in sequence from the second end face of the assembly;

[0020] Tighten the rear cover of the ultrasonic transducer from the second end face using a pre-tightening screw;

[0021] Remove the hollow screws, front cover flange and pressure ring in sequence;

[0022] The assembled ultrasonic transducer is pulled out of the cavity from the first end of the assembly.

[0023] Optionally, a plurality of protrusions are provided in the step, and grooves adapted to the protrusions are provided on the end surface of the front cover flange, and the protrusions are clamped in the grooves;

[0024] The protrusions are evenly distributed along the circumference of the step, and the protrusions and the through grooves are staggered.

[0025] Optionally, the surface roughness of the rear cover plate is less than or equal to Ra0.4.

[0026] The present invention adopts the above assembly method. When assembling the ultrasonic transducer, the front cover is first fastened on the first end face, and then the piezoelectric ceramic and the rear cover are fixed on the second end face, thereby ensuring the coaxiality between the front cover, the rear cover and the piezoelectric ceramic. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of assembling the assembly tool and ultrasonic transducer of the present invention;

[0028] Figure 2 yes Figure 1 AA cross-sectional view;

[0029] Figure 3 It is a structural schematic diagram of the assembly tool of the present invention;

[0030] Figure 4 yes Figure 3 Right view;

[0031] Figure 5 It is a schematic structural diagram of the ultrasonic transducer of the present invention. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] like Figures 1 to 5As shown, the present invention discloses an ultrasonic transducer assembly tool. After the ultrasonic transducer is assembled, the assembly tool can ensure the assembly quality of the ultrasonic transducer and improve the output performance and working stability of the ultrasonic transducer. Specifically, the assembly tool includes an assembly body 100 having a cylindrical cavity 110. The cavity 110 is distributed along the axis of the assembly body 100 and penetrates the assembly body 100, so that the cavity 110 forms a through-hole shape. The overall shape of the assembly body 100 is also cylindrical, and a base 120 is fixed to the cylindrical body to facilitate fixing the assembly body 100 on a work surface.

[0035] In the present invention, the two ends of the assembly 100 are respectively referred to as a first end face 130 and a second end face 140. A front cover flange 300 is screwed to the first end face, and a step 150 is provided on the first end face 130 to fit the front cover 210 of the ultrasonic transducer 200. The front cover 210 of the ultrasonic transducer 200 fits neatly into the step 150, thereby ensuring that the ultrasonic transducer 200 remains coaxial with the assembly 100 and the cavity 110. In addition, a pressure ring 400 is provided between the front cover plate 210 and the front cover plate flange 300 of the ultrasonic transducer 200. The pressure ring 400 is used to press the front cover plate 210 of the ultrasonic transducer 200. When pressing, it needs to be tightened by screws, but since the front end of the ultrasonic transducer 200 also has a lead 260 part, it needs to be tightened by a hollow screw 500 with a hollow channel. The outer surface of the hollow screw 500 needs to be provided with an external thread, and the middle part of the front cover plate flange 300 is a threaded hole. The threaded hole is adapted to the hollow screw 500, so that the hollow screw and the threaded hole are threadedly connected. When pressing the pressure ring 400, tighten the hollow screw to squeeze the pressure ring 400, thereby completing the fastening of the front cover plate 210 of the ultrasonic transducer 200. In one embodiment of the present invention, a plurality of protrusions 160 may be provided near the edge of the step 150, and the protrusions 160 are evenly distributed along the circumference of the step 150, and a groove 310 adapted to the protrusion 160 is provided on the end surface of the front cover flange 300. When installing the front cover flange 300, the protrusion 160 can be snapped into the groove 310 to quickly achieve the positioning of the front cover flange 300.

[0036] In the present invention, the inner wall of the cavity 110 is provided with four evenly distributed through-grooves 170 parallel to the axis of the cavity 110. The depth of the through-grooves 170 matches the length of the pins of the electrode sheet 220 of the ultrasonic transducer 200. The through-grooves 170 are evenly distributed along the circumference of the cavity 110. The through-grooves 170 extend longitudinally from the second end surface 140 to the step 150, facilitating the removal of the ultrasonic transducer 200 from the cavity 110 after assembly. In the present invention, the through-grooves 170 and the protrusions 160 are arranged in a staggered manner.

[0037] When assembling the ultrasonic transducer 200, follow the steps below:

[0038] S1. Insert the front cover plate 210 of the ultrasonic transducer 200 into the cavity 110 from the first end surface 130 of the assembly 100 , so that the front end of the front cover plate 210 of the ultrasonic transducer 200 abuts against the step 150 .

[0039] S2. Insert the pressure ring 400 into the front cover plate 210 of the ultrasonic transducer 200 , and then insert the front cover plate flange 300 into the ultrasonic transducer 200 , so that the groove 310 of the front cover plate flange 300 is exactly stuck in the protrusion 160 .

[0040] S3. Use screws to securely connect the front cover flange 300 to the first end surface 130 .

[0041] S4. Insert the hollow screw 500 into the ultrasonic transducer 200 , and screw the hollow screw 500 into the threaded hole of the front cover flange 300 .

[0042] S5 . Tighten the hollow screw 500 so that the hollow screw 500 compresses the pressure ring 400 , so that the pressure ring 400 presses the front cover plate 210 of the ultrasonic transducer 200 .

[0043] S5. Insert the piezoelectric ceramic 230 , the electrode sheet 220 and the rear cover plate 240 into the cavity 110 in sequence from the second end surface 140 of the assembly 100 , and ensure that the piezoelectric ceramic 230 , the electrode sheet 220 and the rear cover plate 240 are coaxial with the ultrasonic transducer 200 .

[0044] S6. Use the pre-tightening screw 250 to tighten the rear cover 240 of the ultrasonic transducer 200 from the second end surface 140 to fasten the piezoelectric ceramic 230, the electrode sheet 220 and the rear cover 240.

[0045] S7. Remove the hollow screw 500, the front cover flange 300, and the pressure ring 400 in sequence.

[0046] S8 . Pull the assembled ultrasonic transducer 200 out of the cavity 110 from the first end 130 of the assembly 100 .

[0047] In the present invention, in order to ensure that the piezoelectric ceramic 230 does not rotate due to the rotation of the rear cover plate 240 during the application of the pre-tightening force, the end surface roughness of the rear cover plate is required to be less than or equal to Ra0.4, and the end surface roughness of the pre-tightening screw 250 in contact with the rear cover plate 240 is required to be less than or equal to Ra0.4.

[0048] The present invention adopts the above assembly method. When assembling the ultrasonic transducer, the front cover is first fastened on the first end face, and then the piezoelectric ceramic and the rear cover are fixed on the second end face, thereby ensuring the coaxiality between the front cover, the rear cover and the piezoelectric ceramic.

[0049] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0050] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A method for assembling an ultrasonic transducer, characterized in that: When assembling the ultrasonic transducer, the assembly is carried out through an assembly tool, wherein the assembly tool includes an assembly body with a cylindrical cavity and a front cover flange connected to the assembly body, the cavity is distributed along the axis of the assembly body, and the cavity passes through the assembly body, and the assembly body includes a first end face and a second end face; the first end face is provided with a step adapted to the front cover of the ultrasonic transducer, so that the front cover of the ultrasonic transducer is just stuck in the step; a pressure ring is also provided between the front cover of the ultrasonic transducer and the front cover flange; the inner wall of the cavity is provided with four through grooves that are evenly distributed and parallel to the axis of the cavity, the depth of the through grooves is adapted to the length of the electrode pins of the ultrasonic transducer, and the through grooves are evenly distributed along the circumference of the cavity; the middle part of the front cover flange is provided with a through threaded hole, and a hollow screw is threadedly connected to the threaded hole, so that the pressure ring is tightened by the hollow screw; The assembly method of the ultrasonic transducer comprises the following steps: Inserting the front cover of the ultrasonic transducer from the first end face of the assembly; Put the pressure ring into the ultrasonic transducer, and then put the front cover flange into the ultrasonic transducer, and make the front cover flange just stuck in the step; Use screws to securely connect the front cover flange to the first end face; Insert the hollow screw into the ultrasonic transducer and screw it into the threaded hole of the front cover flange; Tighten the hollow screw so that the hollow screw compresses the pressure ring, and the pressure ring presses the front cover of the ultrasonic transducer; Insert the piezoelectric ceramic, the electrode sheet and the back cover into the cavity in sequence from the second end face of the assembly; Tighten the rear cover of the ultrasonic transducer from the second end face using a pre-tightening screw; Remove the hollow screws, front cover flange and pressure ring in sequence; The assembled ultrasonic transducer is pulled out of the cavity from the first end of the assembly.

2. The ultrasonic transducer assembly method according to claim 1, characterized in that: A plurality of protrusions are provided in the step, and grooves adapted to the protrusions are provided on the end surface of the front cover flange, and the protrusions are clamped in the grooves; The protrusions are evenly distributed along the circumference of the step, and the protrusions and the through grooves are staggered.

3. The ultrasonic transducer assembly method according to claim 2, characterized in that: The surface roughness of the rear cover is less than or equal to Ra0.4.

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