A polishing device for a transducer acoustic window

Abstract

The utility model belongs to transducer production technical field relates to a kind of polishing and polishing device of transducer sound-transparent layer, including bottom plate (3), bottom plate (3) is equipped with slide rail rotating seat (5) and polishing disc (26), slide rail rotating seat (5) is installed with slide rail (6), slide rail (6) is equipped with slide rail movable seat (7), slide rail movable seat (7) is installed with crossbeam (11) and crossbeam (11) is installed with transducer fixed seat (13), transducer (1) is installed on transducer fixed seat (13), the outside of bottom plate (3) is equipped with grinding disc (2), slide rail rotating seat (5) can rotate on bottom plate (3), to make transducer (1) can move between the above of grinding disc (2) and the above of polishing disc (26).It can be conveniently and quickly and high-precision to complete transducer plane sound-transparent layer's polishing, polishing work, and the accurate control of sound-transparent adhesive layer, and can be more conveniently assisted measurement acoustic performance work.

Description

Technical Field

[0001] This utility model belongs to the field of transducer manufacturing technology, specifically relating to a grinding and polishing device for the sound-transmitting layer of a transducer. Background Technology

[0002] Currently, in the field of sonar transducer manufacturing technology, whether it is a transmitting transducer, a receiving transducer, or a transducer that integrates both transmitting and receiving, its basic structure consists of piezoelectric ceramics, a sound-permeable adhesive layer, a backing, and a substrate. Among them, the sound-permeable adhesive layer is formed by vulcanizing epoxy resin or other types of adhesives onto the substrate and transducer surface to form a sound-permeable layer, depending on the application and functional requirements of different products. It is a relatively important component of sonar transducers, and the thickness, uniformity, density, and surface smoothness of the adhesive layer can directly affect the acoustic performance and appearance quality of the transducer.

[0003] The shape of the acoustically transparent adhesive layer, depending on the application requirements, commonly includes cylindrical planar, arc-shaped, or spherical forms. For planar acoustically transparent adhesive layers in transducers, a certain thickness is sometimes required based on design needs to meet acoustic performance specifications such as bandwidth, admittance, and impedance. Especially during the product development stage, after design simulation, it is necessary to actually measure different adhesive layer thicknesses to detect differences in actual performance indicators and determine the optimal thickness. The more precise the thickness control of the acoustically transparent layer and the smoother the surface, the more realistic the measured acoustic performance values ​​will be, allowing for more accurate feedback in the design simulation and timely adjustments. Furthermore, for delivered transducer products, in addition to meeting acoustic performance requirements, high requirements are also placed on appearance quality.

[0004] Currently, most methods for grinding the thickness of the acoustic layer in planar shapes rely on manual grinding using a transducer held on a grinding wheel or sandpaper. This often results in an uneven surface and inconsistent thickness of the acoustic layer, leading to distorted performance parameters and affecting the determination of design parameters. During grinding, the acoustic layer thickness needs to be measured simultaneously, followed by performance measurement using an impedance analyzer, which is time-consuming. Furthermore, the surface is rough after grinding, lacks gloss, and fails to meet product appearance requirements. Manual grinding is labor-intensive, slow, and inefficient, making it suitable only for temporary, low-requirement, single-piece grinding, but not for grinding with high testing requirements, high appearance quality requirements, or batch processing.

[0005] In summary, existing sound-transmitting layer grinding devices are insufficient to address the aforementioned problems and requirements, and a convenient, fast, and highly accurate comprehensive solution is still lacking. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, this utility model proposes a transducer sound-transmitting layer grinding and polishing device, which can conveniently, quickly and with high precision complete the grinding and polishing of the transducer planar sound-transmitting layer, as well as the precise control of the sound-transmitting adhesive layer, and can also conveniently assist in measuring acoustic performance.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A grinding and polishing device for the sound-transmitting layer of a transducer includes a base plate. The base plate is characterized by having a slide rail rotating seat and a polishing disc. A slide rail is mounted on the slide rail rotating seat, and a movable slide rail seat that can move up and down along the slide rail is provided on the slide rail. A crossbeam is mounted on the movable slide rail seat, and a transducer fixing seat is mounted on the crossbeam. The transducer is mounted on the transducer fixing seat. A grinding disc is provided on the outer side of the base plate. The slide rail rotating seat can rotate on the base plate so that the transducer can move between above the grinding disc and above the polishing disc.

[0009] Preferably, the slide rail rotating seat is mounted on the base plate via a slide rail rotating shaft and a first rolling bearing. The slide rail rotating shaft is located inside the slide rail rotating seat and connected to the first rolling bearing located inside the base plate. The slide rail rotating seat is provided with an assembly hole, and the base plate is provided with holes A and B. By using a positioning pin passing through the assembly hole and hole A or hole B, the transducer can be fixed above the grinding disc or the polishing disc.

[0010] Preferably, the first rolling bearing is installed in the base plate via a first bearing end cover, and the slide rail rotating shaft is installed in the slide rail rotating seat via a pressure plate and pressure seat screws.

[0011] Preferably, the top end of the slide rail is equipped with an upper bearing seat, the upper bearing seat is used to assemble a second rolling bearing, the lead screw is interference-fitted onto the second rolling bearing and passes through the threaded hole of the lead screw movable seat, the lead screw movable seat is connected to the slide rail movable seat and the crossbeam is assembled on the back of the lead screw movable seat, and the top end of the lead screw is equipped with a first handwheel.

[0012] Preferably, the left and right sides of the slide rail are respectively provided with slide rail movable seats that can move up and down along the slide rail, and the two sides of the lead screw movable seat are respectively engaged with the two slide rail movable seats, and the V-shaped groove surface of the slide rail movable seat is engaged with the V-shaped surface on the slide rail for sliding.

[0013] Preferably, the second rolling bearing is mounted in the upper bearing housing via a second bearing cap.

[0014] Preferably, the polishing disc is connected to the driven wheel, and the base plate is provided with a second handwheel and a driving wheel connected to the second handwheel. The driving wheel and the driven wheel are connected by a belt.

[0015] Preferably, a driven wheel shaft and a driving wheel shaft are mounted on the base plate, the polishing disc is mounted on the upper end of the driven wheel shaft, the driven wheel is mounted on the lower end of the driven wheel shaft, the second handwheel is mounted on the upper end of the driving wheel shaft, and the driving wheel is mounted on the lower end of the driving wheel shaft.

[0016] Preferably, a fixed scale is provided on the front of the slide rail, and a vernier scale is mounted on the movable seat of the slide rail.

[0017] Preferably, the transducer further includes an impedance analyzer, the electrode lines of which are connected to the impedance analyzer.

[0018] Compared with the prior art, the transducer sound-transmitting layer polishing device of this utility model has one or more of the following beneficial technical effects:

[0019] 1. This utility model is a convenient, fast, and high-precision transducer acoustic layer grinding and polishing device, which integrates grinding and polishing. It can quickly realize the grinding and polishing of the transducer planar acoustic layer and conveniently assist in measuring acoustic performance. After each process is completed, the transducer does not need to be removed before the next process. Only simple rotation and positioning are required to carry out the next process. It is convenient to use and simple and fast to operate.

[0020] This utility model features a fixed scale and a vernier scale, with a minimum accuracy of 0.02mm. By reading the scale, the thickness of the adhesive layer to be ground off can be accurately controlled. During the grinding process, the transducer does not need to be removed to measure the adhesive layer thickness; changes in thickness can be directly monitored at any time, resulting in more precise thickness control and more accurate feedback for design and adjustments. The resulting sound-permeable layer, after grinding and polishing, has a more uniform thickness, ensuring consistent performance and providing more accurate feedback to the transducer design, thus achieving design goals more quickly. Furthermore, this design results in a smoother surface and better appearance quality after uniform polishing.

[0021] 3. Whether grinding, polishing, or measuring the acoustic performance of a product directly on the device after polishing, the operation of this utility model is relatively simple, labor-saving, and time-saving, which greatly reduces labor costs, significantly improves production efficiency, and increases quality benefits.

[0022] 4. This utility model is applicable to both the research and development stage and the polishing of the sound-transmitting layer of a single transducer product, as well as the processing of the planar sound-transmitting layer of transducers in small or large batches. It has strong applicability and good economic and quality benefits. Attached Figure Description

[0023] Figure 1 This is an isometric schematic diagram of the transducer sound-transmitting layer polishing device of this utility model.

[0024] Figure 2 This is an isometric view of the transducer sound-transmitting layer polishing device of this utility model from another angle.

[0025] Figure 3 This is an isometric view of the transducer sound-transmitting layer polishing device of this utility model from another angle.

[0026] Figure 4 This is a schematic diagram of the main structure of the transducer sound transmission layer polishing device of this utility model. For clarity, the polishing device on the base plate is not shown.

[0027] Figure 5 This is a left-side structural schematic diagram of the transducer sound-transmitting layer polishing device of this utility model, in which a partial cross-section is shown to illustrate the installation structure of the slide rail rotating seat.

[0028] Figure 6 This is a schematic diagram of the AA planar structure. For clarity, the polishing device on the base plate is not shown.

[0029] Figure 7 This is a schematic diagram of the BB cross-section structure.

[0030] Figure 8 This is a schematic diagram of the CC cross-section structure.

[0031] Figure 9 This is a schematic diagram of the DD cross-section structure.

[0032] Figure 10 This is an isometric schematic diagram of the impedance analyzer in this utility model;

[0033] In the diagram: 1. Transducer; 2. Grinding disc; 3. Base plate; 4. Support leg; 5. Slide rail rotating seat; 6. Slide rail; 7. Slide rail movable seat; 8. Fixed scale; 9. Vernier scale; 10. First fixing screw; 11. Crossbeam; 12. Nut; 13. Transducer fixing seat; 14. First handwheel; 15. Second bearing cover; 16. Upper bearing seat; 17. Second rolling bearing; 18. Lead screw; 19. Second fixing screw; 20. Pressure seat screw; 21. Pressure plate ; 22. Slide rail rotating shaft; 23. First bearing cover; 24. First rolling bearing; 25. Locating pin; 26. Polishing disc; 27. Driven wheel shaft; 28. First end cover; 29. ​​Screw; 30. Belt; 31. Second end cover; 32. Drive wheel; 33. Drive wheel shaft; 34. Set screw; 35. Third fixing screw; 36. Locating block; 37. Fourth fixing screw; 38. Lead screw movable seat; 39. Impedance analyzer; 40. Second handwheel. Detailed Implementation

[0034] Before describing any embodiment of this invention in detail, it should be understood that the invention is not limited in its application to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention is capable of other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof herein is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0035] Furthermore, firstly, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation on this utility model. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0036] like Figure 1-4As shown, the transducer sound-transmitting layer polishing device of this utility model includes a base plate 3. The base plate 3 has four adjustable leveling and height support legs 4. By adjusting the support legs 4, a level can be used to find the level during use. A grinding disc 2 is provided on one side of the base plate 3. The grinding disc 2 can be supported by any support structure not shown in the figure and driven by any driving device.

[0037] like Figure 5 As shown, the slide rail 6 is assembled on the base plate 3 via the slide rail rotating seat 5, the slide rail rotating shaft 22, the first rolling bearing 24, the bearing end cover 23, the pressure plate 21, and the pressure seat screw 20.

[0038] Specifically, the slide rail rotating seat 5 is mounted on the base plate 3 via a slide rail rotating shaft 22 and a first rolling bearing 24. The slide rail rotating shaft 22 is located inside the slide rail rotating seat 5 and connected to the first rolling bearing 24 located inside the base plate 3. For example, the first rolling bearing 24 is mounted inside the base plate 3 via a first bearing end cap 23, and the slide rail rotating shaft 22 is mounted inside the slide rail rotating seat 5 via a pressure plate 21 and a pressure seat screw 20.

[0039] like Figure 6 and 7 As shown, the slide rail rotating seat 5 is provided with mounting holes, and the base plate 3 is provided with holes A and B. The slide rail 6 and the slide rail rotating seat 5 can rotate freely together. After mounting the positioning pin 25 in hole A or hole B, the free rotation of the slide rail 6 and the slide rail rotating seat 5 can be restricted.

[0040] like Figure 9 As shown, an upper bearing housing 16 is assembled at the top of the slide rail 6. The upper bearing housing 16 can be mounted on the top of the slide rail 6 using a third fixing screw 35. The upper bearing housing 16 is used to assemble a second rolling bearing 17, for example, by mounting the second rolling bearing 17 inside the upper bearing housing 16 using a second bearing cap 15. The second bearing cap 15 can be mounted on the upper bearing housing 16 using a fourth fixing screw 37. A lead screw 18 is connected via the second rolling bearing 17. The lead screw 18 is interference-fitted onto the second rolling bearing 17. And as... Figure 6As shown, the lead screw 18 passes through the threaded hole of the lead screw movable seat 38. Rotating the first handwheel 14 at the top of the lead screw 18 allows the lead screw movable seat 38 to move up and down. Slide rail movable seats 7 are mounted on both sides of the lead screw movable seat 38. The lead screw movable seat 38 can be fixed to the slide rail movable seat 7 by the second fixing screw 19. The V-groove surface of the slide rail movable seat 7 slides in conjunction with the V-shaped surface on the slide rail 6. A crossbeam 11 is mounted on the back of the lead screw movable seat 38, and a transducer fixing seat 13 is connected to the crossbeam 11, for example, by a nut 12. When the lead screw movable seat 38 moves up and down, it drives the slide rail movable seat 7 and the crossbeam 11 to move up and down together. The transducer 1 is then mounted on the transducer fixing seat 13. The electrode wire of the transducer 1 passes through the pre-drilled wire hole in the transducer fixing seat 13, so that after the transducer's sound-permeable adhesive layer is ground and polished, as... Figure 10 As shown, when measuring the acoustic performance of a transducer using an impedance analyzer 39, the measurement can be performed by directly connecting the electrode wires of the transducer without removing the transducer, which saves time and effort.

[0041] Preferably, the slide rail 6 is provided with a positioning hole 36, and the positioning block 36 can limit the upward movement distance of the slide rail movable seat 7.

[0042] A polishing assembly is provided on the base plate 3. The polishing assembly includes a driven wheel shaft 27 and a driving wheel shaft 33. Figure 8 As shown, a driven wheel is mounted on the driven wheel shaft 27 via a first end cap 28 and screws 29. A polishing disc 26 is mounted on the upper end of the driven wheel shaft 27 via set screws 34. A driving wheel 32 is mounted on the driving wheel shaft 33 via a second end cap 31. A second handwheel 40 is mounted on the driving wheel shaft 33. The driving wheel 32 and the driven wheel are connected by a belt 30 for transmission, with a diameter ratio of d2:d3=5:1, resulting in a rotational speed ratio of V2:V3=1:5. The center of the driven wheel shaft 27 is located at a coordinate position with a rotation angle of 50° on the rotation radius trajectory of the transducer fixing seat 13, centered on the rotation center of the slide rail rotating seat 5. After the sound-permeable adhesive layer is polished, the positioning pin 25 on the slide rail rotating seat 5 is removed, as shown... Figure 7 As shown, simply rotating the slide rail swivel seat by 50° will allow the transducer to be polished against the polishing disc 26.

[0043] A fixed scale 8 is provided on the front of the slide rail 6, and a vernier scale 9 is mounted on the slide rail movable seat 7. For example, the vernier scale 9 is mounted on the slide rail movable seat 7 using a first fixing screw 10. The minimum accuracy of the scale is 0.02mm. During the grinding process, the grinding feed amount can be observed at any time through the scale, thereby accurately controlling the amount of grinding required to achieve the desired thickness of the sound-permeable adhesive layer.

[0044] By implementing the above technical solutions, this utility model can achieve quick operation from grinding and polishing to measurement of the transducer's acoustic adhesive layer, and can also achieve precise control of the acoustic adhesive layer. This can provide more realistic feedback to the transducer design, thereby helping to achieve the design goals more quickly, and also ensure the consistency of the transducer's acoustic performance and appearance quality. At the same time, it is labor-saving and time-saving, greatly reducing labor costs and improving production efficiency and quality benefits.

[0045] The transducer sound-transmitting layer polishing device of this utility model includes the following steps in its usage:

[0046] Step 1: Before use, assemble the grinding and polishing device according to the diagram and adjust the level of the base plate 3; check whether the device can be operated flexibly without jamming; check whether the required action can be achieved.

[0047] Step 2: Assemble and fix the transducer 1 to be polished on the transducer mounting base 13. The measuring electrode wires on the transducer 1 are led out through the holes on the mounting base for easy wire clamping measurement.

[0048] Step 3: Attach the sandpaper for sanding to the grinding disc 2, and attach the polishing cloth and apply polishing paste to the polishing disc 26.

[0049] Step 4: Rotate the first handwheel 14 left and right, and the lead screw 18 will slide up and down along the V-shaped surface of the slide rail 6 through the lead screw movable seat 38, thereby driving the crossbeam 11 and the transducer fixed seat 13 to move up and down, realizing the grinding and polishing feed, and the grinding and polishing after leaving the grinding and polishing discs.

[0050] Step 5: When polishing, first determine the thickness of the sound-permeable adhesive layer that needs to be polished away, then place the polishing surface of the lower end of the transducer's sound-permeable layer on the blade, so that the polishing surface just contacts the sandpaper surface, and record the readings of the fixed scale 8 and the vernier scale 9 at this time.

[0051] Step 6: First, raise the transducer by about 1 mm and move it away from the grinding disc 2; turn on the drive device of the grinding disc 2, and the grinding disc 2 will rotate at a speed of about 500 r / min; then slowly and uniformly rotate the first handwheel 14 to make the lower end face of the transducer descend at a uniform speed for grinding feed, while observing the scale reading until the required thickness is achieved.

[0052] The ruler has a minimum precision of 0.02mm. By reading the ruler, the thickness of the sound-transmitting layer that needs to be ground off can be accurately controlled.

[0053] Step 7: After polishing, rotate the first handwheel 14 to lift the transducer 1 a certain distance away from the polishing disc 2, and turn off the power of the drive device of the polishing disc 2; then pull out the positioning pin 25, rotate the slide rail rotating seat 5 by 50°, align it with the B hole, insert the positioning pin 25 into the B hole to limit it, at this time the transducer 1 is just aligned with the polishing disc 26.

[0054] Step 8: Rotate the first handwheel 14 at the upper end of the lead screw 18 so that the lower end face of the transducer just contacts the polishing disc 26; rotate the second handwheel 40 on the drive shaft, and the polishing disc 26 rotates to polish the lower end face of the transducer's sound-permeable adhesive layer. After polishing, rotate the first handwheel 14 so that the lower end face of the transducer moves away from the polishing disc 26.

[0055] Step 9: After polishing the acoustic layer, connect the measuring line of the impedance analyzer 29 to the electrode lead of the transducer, and then the measurement can be performed. If the thickness needs to be further polished according to the acoustic performance requirements, follow the previous operation steps, rotate the slide rail seat 5, return it to the A hole position for limiting, and then polish it again. Repeat the polishing, measurement and grinding process until the acoustic performance index of the required acoustic layer thickness is met.

[0056] In step 7, before polishing after grinding, the transducer does not need to be removed from the transducer mounting base 13. Simply pull out the positioning pin 25 and rotate the slide rail rotating base 5 by 50° to perform the polishing process.

[0057] In step 8, measuring the acoustic performance after polishing, the transducer does not need to be removed from the transducer mounting base 13. The measurement can be performed by directly connecting the measuring line of the impedance analyzer 29 to the lead electrode line of the transducer.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit the scope of protection of this utility model. Those skilled in the art can modify or make equivalent substitutions to the technical solution of this utility model based on the concept of this utility model, without departing from the essence and scope of the technical solution of this utility model.

Claims

1. A device for polishing and grinding the acoustic layer of a transducer, comprising a base plate (3), characterized in that, The base plate (3) is provided with a slide rail rotating seat (5) and a polishing disc (26). A slide rail (6) is installed on the slide rail rotating seat (5). A slide rail movable seat (7) that can move up and down along the slide rail (6) is provided on the slide rail movable seat (7). A crossbeam (11) is installed on the slide rail movable seat (7) and a transducer fixing seat (13) is installed on the crossbeam (11). The transducer (1) is installed on the transducer fixing seat (13). A grinding disc (2) is provided on the outer side of the base plate (3). The slide rail rotating seat (5) can rotate on the base plate (3) so that the transducer (1) can move between the top of the grinding disc (2) and the top of the polishing disc (26).

2. The grinding and polishing device for the transducer acoustic layer according to claim 1, characterized in that, The slide rail rotating seat (5) is mounted on the base plate (3) via the slide rail rotating shaft (22) and the first rolling bearing (24). The slide rail rotating shaft (22) is located inside the slide rail rotating seat (5) and connected to the first rolling bearing (24) located inside the base plate (3). The slide rail rotating seat (5) is provided with an assembly hole and the base plate (3) is provided with hole A and hole B. The transducer (1) can be fixed above the grinding disc (2) or above the polishing disc (26) by means of a positioning pin (25) passing through the assembly hole and hole A or hole B.

3. The grinding and polishing device for the transducer acoustic layer according to claim 2, characterized in that, The first rolling bearing (24) is installed in the base plate (3) via the first bearing end cover (23) and the slide rail rotating shaft (22) is installed in the slide rail rotating seat (5) via the pressure plate (21) and the pressure seat screw (20).

4. The grinding and polishing device for the transducer acoustic layer according to claim 1, characterized in that, The top of the slide rail (6) is fitted with an upper bearing seat (16), which is used to assemble a second rolling bearing (17). The lead screw (18) is interference-fitted onto the second rolling bearing (17) and passes through the threaded hole of the lead screw movable seat (38). The lead screw movable seat (38) is connected to the slide rail movable seat (7), and the crossbeam (11) is mounted on the back of the lead screw movable seat (38). The top of the lead screw (18) is fitted with a first handwheel (14).

5. The grinding and polishing device for the transducer acoustic layer according to claim 4, characterized in that, The slide rail (6) is provided with slide rail movable seats (7) on the left and right sides respectively, which can move up and down along the slide rail (6). The two sides of the screw movable seat (38) are respectively engaged with the two slide rail movable seats (7). The V-shaped groove surface of the slide rail movable seat (7) is engaged with the V-shaped surface on the slide rail (6) for sliding.

6. The grinding and polishing device for the transducer acoustic layer according to claim 5, characterized in that, The second rolling bearing (17) is mounted in the upper bearing housing (16) via the second bearing cap (15).

7. The grinding and polishing device for the transducer acoustic layer according to claim 1, characterized in that, The polishing disc (26) is connected to the driven wheel. The base plate (3) is provided with a second handwheel (40) and a driving wheel (32) connected to the second handwheel (40). The driving wheel (32) and the driven wheel are connected by a belt (30).

8. The grinding and polishing apparatus for the transducer acoustic layer according to claim 7, characterized in that, The base plate (3) is equipped with a driven wheel shaft (27) and a driving wheel shaft (33). The polishing disc (26) is installed on the upper end of the driven wheel shaft (27), the driven wheel is installed on the lower end of the driven wheel shaft (27), the second handwheel (40) is installed on the upper end of the driving wheel shaft (33), and the driving wheel (32) is installed on the lower end of the driving wheel shaft (33).

9. The apparatus for polishing the transducer acoustic layer according to any one of claims 1-8, characterized in that, A fixed scale (8) is provided on the front of the slide rail (6), and a vernier scale (9) is mounted on the slide rail movable seat (7).

10. The grinding and polishing apparatus for the transducer acoustic layer according to claim 9, characterized in that, It further includes an impedance analyzer (39), the electrode lines of the transducer (1) being connected to the impedance analyzer (39).

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