A charge output element and assembly method thereof

Abstract

The present invention discloses a charge output element and an assembly method thereof, wherein the charge output element comprises: a bracket, a piezoelectric element, a mass block and a clamping ring, wherein the bracket is a rotating body structure; the inner ring surface of the piezoelectric element is sleeved on the outer ring surface of the bracket, and the piezoelectric element is provided with at least one structural groove penetrating the side wall along its axial direction; the inner ring surface of the mass block is sleeved on the outer ring surface of the piezoelectric element, and the mass block is provided with at least one open groove penetrating the side wall along its axial direction; the clamping ring is a rotating body structure, and the inner ring surface of the clamping ring is interference fit with the outer ring surface of the mass block. The present invention does not require a special production environment and assembly equipment, and can quickly complete assembly under normal temperature. The present invention has a simple structure, is easy to assemble, is simple to operate, and is flexible to assemble. It is suitable for mass production and can ensure the consistency of product performance.

Description

Technical field

[0001] The present invention relates to the technical field of sensors, and in particular to a charge output element and an assembly method thereof. [Background Technology]

[0002] An accelerometer is a test instrument that converts the pressure generated by physical phenomena such as acceleration, vibration, and shock into a measurable electrical signal. When a piezoelectric accelerometer is subjected to vibration, the inertial force exerted by the mass on the piezoelectric element changes accordingly. Piezoelectric accelerometers utilize the piezoelectric effect of the piezoelectric element to detect acceleration.

[0003] A charge output element is provided in a piezoelectric accelerometer. In the prior art, the various components of the charge output element are connected by a connecting layer. Although the connecting layer connection method can enable the various components of the charge output element to be assembled and combined, the connection layer connection method has extremely high requirements on the quality of the connecting layer and the assembly operation. If the connecting layer contains impurities or the assembly operation is improper, the connection strength between the various components of the charge output element will be reduced, resulting in insufficient overall stiffness of the charge output element, which in turn leads to excessively low frequency response and resonance performance of the piezoelectric accelerometer.

[0004] CN201720669166.1 provides a charge output element capable of ensuring its rigidity. However, this requires cooling the mass block, piezoelectric element, and bracket individually to relatively low temperatures to induce sufficient contraction deformation before assembly. This imposes stringent requirements on the operating environment, operator, and assembly precision, significantly limiting the mass production of charge output elements. Because the linear expansion coefficients of the materials used in the mass block, piezoelectric element, and bracket are relatively low (on the order of 10⁻⁶ / °C), achieving a sufficient degree of contraction deformation requires extremely low cooling temperatures, making the process cumbersome and difficult to implement. [Summary of the invention]

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for assembling a charge output element that can be quickly assembled at room temperature without requiring a special production environment or special assembly equipment. The method is simple, fast, efficient, and easy to mass produce.

[0006] Another object of the present invention is to provide a charge output element assembled using the charge output element assembly method, which is simple, fast and efficient to operate and easy to mass produce.

[0007] In order to achieve the above object, the solution of the present invention is:

[0008] A method for assembling a charge output element comprises the following steps:

[0009] Step 1: Place the raising fixture on the bracket;

[0010] Step 2: Insert the piezoelectric element into the bracket until its bottom surface is flush with the upper surface of the raising fixture;

[0011] Step 3: Insert the mass block into the piezoelectric element until its bottom surface is flush with the upper surface of the raising fixture;

[0012] Step 4: Slide the clamping collar onto the outer conical surface of the mass block until its bottom surface contacts the outer conical surface of the mass block. Then apply force along its axial direction until the clamping collar fits against the upper surface of the padding fixture. Once all components are assembled in place, stop applying force.

[0013] Step 5: Remove the raising fixture.

[0014] Furthermore, the bracket is an inverted T-shaped rotating structure with a base plate and a column, and the raising fixture is provided with an opening ≥ the bracket column, the opening of the raising fixture is matched on the bracket column, and the bottom surface of the raising fixture is matched on the top surface of the base plate of the bracket.

[0015] A charge output element assembled using the charge output element assembly method includes a bracket having a rotating body structure;

[0016] a piezoelectric element, the inner annular surface of which is sleeved on the outer annular surface of the bracket, and the piezoelectric element is provided with at least one structural groove penetrating the side wall along its axial direction;

[0017] a mass block, the inner annular surface of which is sleeved on the outer annular surface of the piezoelectric element, and the mass block is provided with at least one open groove penetrating the side wall along its axial direction;

[0018] A clamping ring, which is a rotating body structure, the inner ring surface of the clamping ring and the outer ring surface of the mass block are interference fit, and an installation guide structure is provided between the clamping ring and the mass block; and

[0019] A detachable heightening fixture that fits on the bracket.

[0020] Furthermore, the bracket is an inverted T-shaped rotating structure with a base plate and a column. The raising fixture has an opening that is larger than or equal to the bracket column. The opening of the raising fixture fits on the bracket column, and the bottom surface of the raising fixture fits on the top surface of the bracket base plate. Furthermore, the outer annular surface of the mass block is provided with an outer conical surface, or the inner annular surface of the clamping collar is provided with an inner conical surface. The outer conical surface of the mass block or the inner conical surface of the clamping collar forms the installation guide structure.

[0021] Furthermore, the outer ring surface of the mass block is provided with an outer conical surface, and the inner ring surface of the clamping ring is provided with an inner conical surface. The outer conical surface of the mass block and the inner conical surface of the clamping ring form the installation guide structure.

[0022] Furthermore, the piezoelectric element has an inner cylindrical surface and an outer cylindrical surface, both of which are provided with a conductive layer. The cross-section of the structural groove of the piezoelectric element or the upper and lower end surfaces of the piezoelectric element has no conductive layer or its conductive layer is not connected to the conductive layer of the inner cylindrical surface and the outer cylindrical surface.

[0023] Furthermore, the piezoelectric element is provided with a plurality of structural grooves along its axial direction, and at least one of the structural grooves passes through the side wall of the piezoelectric element.

[0024] Furthermore, the mass block is provided with a plurality of open slots along its axial direction, and at least one of the open slots passes through the side wall of the mass block.

[0025] Furthermore, the clamping ring is a completely closed annular structure.

[0026] Compared to existing charge output elements using a connection layer, the present invention, with its simple structure, requires no specialized production environment or assembly equipment and can be quickly assembled at room temperature. This device utilizes the piezoelectric effect of a piezoelectric element to generate a charge change proportional to the acceleration mechanics. This charge change is then converted into an IEPE voltage signal output via a built-in miniaturized circuit board, facilitating data acquisition for the detection system. This device boasts a simple structure, easy assembly, simple operation, and flexible assembly, making it suitable for mass production and ensuring consistent product performance.

Brief Description of the Drawings

[0027] Figure 1a A perspective view of a preferred embodiment of the present invention; Figure 1b for Figure 1a A top view of Figure 1c for Figure 1b sectional view of .

[0028] Figure 2a A perspective view of a first embodiment of the bracket of the present invention; Figure 2b for Figure 2a A top view of Figure 2c for Figure 2b sectional view of .

[0029] Figure 3a A perspective view of a second embodiment of the bracket of the present invention; Figure 3b for Figure 3a A top view of Figure 3c for Figure 3b sectional view of .

[0030] Figure 4aA perspective view of a third embodiment of the bracket of the present invention; Figure 4b for Figure 4a A top view of Figure 4c for Figure 4b sectional view of .

[0031] Figure 5a A perspective view of a fourth embodiment of the bracket of the present invention; Figure 5b for Figure 5a A top view of Figure 5c for Figure 5b sectional view of .

[0032] Figure 6a A perspective view of a first embodiment of a piezoelectric element according to the present invention; Figure 6b for Figure 6a A top view of Figure 6c for Figure 5b sectional view of .

[0033] Figure 7a A perspective view of a second embodiment of a piezoelectric element according to the present invention; Figure 7b for Figure 7a A top view of Figure 7c for Figure 7b sectional view of .

[0034] Figure 8a is a perspective view of a third embodiment of a piezoelectric element of the present invention; Figure 8b for Figure 8a A top view of Figure 8c for Figure 8b sectional view of .

[0035] Figure 9a is a perspective view of a fourth embodiment of a piezoelectric element of the present invention; Figure 9b for Figure 9a A top view of Figure 9c for Figure 9b sectional view of .

[0036] Figure 10a A perspective view of a first embodiment of a mass block according to the present invention; Figure 10b for Figure 10a A top view of Figure 10c for Figure 10b sectional view of .

[0037] Figure 11a A perspective view of a second embodiment of the mass block of the present invention; Figure 11b for Figure 11a A top view of Figure 11c for Figure 11b sectional view of .

[0038] Figure 12a A perspective view of a third embodiment of a mass block according to the present invention; Figure 12b for Figure 12a A top view of Figure 12c for Figure 12b sectional view of .

[0039] Figure 13a is a perspective view of a fourth embodiment of a mass block of the present invention; Figure 13b for Figure 13a A top view of Figure 13c for Figure 13b sectional view of .

[0040] Figure 14a is a perspective view of a fifth embodiment of the mass block of the present invention; Figure 14b for Figure 14a A top view of Figure 14c for Figure 14b sectional view of .

[0041] Figure 15a is a perspective view of a fifth embodiment of the mass block of the present invention; Figure 15b for Figure 15a A top view of Figure 15c for Figure 15b sectional view of .

[0042] Figure 16a A perspective view of a first embodiment of the clamping collar of the present invention; Figure 16b for Figure 16a A top view of Figure 16c for Figure 16b sectional view of .

[0043] Figure 17a A perspective view of a second embodiment of the holding collar of the present invention; Figure 17b for Figure 17a A top view of Figure 17c for Figure 17b sectional view of .

[0044] Figure 18 The figure is a flow chart of a method for assembling a charge output element according to the present invention. [Specific implementation method]

[0045] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0046] like Figure 18 As shown, the present invention discloses a method for assembling a charge output element, which includes the following steps:

[0047] Step 1: Place the raising fixture 5 on the bracket 1;

[0048] Step 2: Insert the piezoelectric element 2 into the bracket until its bottom surface is flush with the upper surface of the raising fixture 5;

[0049] Step 3: Insert the mass block 3 into the piezoelectric element 2 until its bottom surface is flush with the upper surface of the raising fixture 5;

[0050] Step 4: Insert the clamping collar 4 onto the outer conical surface of the mass block 3 until its bottom surface contacts the outer conical surface of the mass block 3, and then apply force along its axial direction until the clamping collar 4 fits the upper surface of the raising fixture 5. When all components are assembled in place, stop applying force.

[0051] Step 5: Remove the raising fixture 5.

[0052] The linear expansion coefficients of the bracket 1, the piezoelectric element 2, the mass block 3 and the clamping ring 4 of the present invention do not need to have a specific size relationship requirement.

[0053] The bracket 1 is an inverted T-shaped rotating structure having a base plate 12 and a column 11. The raising fixture 5 is provided with an opening 51 that is greater than or equal to the bracket column 11. The opening 51 of the raising fixture 5 is fitted on the column 11 of the bracket 1, and the bottom surface of the raising fixture 5 is fitted on the top surface of the base plate 12 of the bracket 1.

[0054] like Figures 1a to 1c As shown, the present invention also discloses a charge output element assembled using the assembly method of the charge output element, which includes: a bracket 1, a piezoelectric element 2, a mass block 3, a clamping ring 4 and a raising fixture 5, the inner ring surface of the piezoelectric element 2 is sleeved on the outer ring surface of the bracket 1, the inner ring surface of the mass block 3 is sleeved on the outer ring surface of the piezoelectric element 2, and the inner ring surface of the clamping ring 4 is sleeved on the outer ring surface of the mass block 3.

[0055] There are no specific requirements for the fit between the piezoelectric element 2 and the bracket 1, or between the piezoelectric element 2 and the mass 3. The piezoelectric element 2 and the bracket 1, and between the piezoelectric element 1 and the mass 3, can actually be an interference fit, a clearance fit, or a transition fit. The clamping collar 4 and the mass 3 have an interference fit. The heightening fixture 5 is removably attached to the bracket 1, and the final charge output element does not include the heightening fixture 5. The heightening fixture 5 has an opening 51 that is greater than or equal to the column 11 of the bracket 1. The opening 51 of the heightening fixture 5 fits on the column 11 of the bracket 1, and the bottom surface of the heightening fixture 5 fits on the top surface of the bottom plate 12 of the bracket 1.

[0056] Under normal temperature, after the piezoelectric element 2 and the bracket 1, and the piezoelectric element 2 and the mass block 3 are installed in place, the clamping ring 4 is placed on the mass block 3. After the tapered guide cone surface between the two is in place, the clamping ring is applied with a certain amount of extrusion force along its axial direction using a jig, so that the clamping ring moves along the guide cone surface between it and the mass block until the relative position of the clamping ring and the mass block meets the design requirements, and the assembly process of the charge output element is completed.

[0057] like Figures 2a to 5c The following are schematic diagrams of four embodiments of the structure of the bracket 1. The bracket 1 is a T-shaped rotating structure having a column 11 and a bottom plate 12. Figures 2a to 5c In each of the embodiments shown, the bracket 1 is a cylindrical rotating body with a T-shaped structure, but the structure of the bracket 1 is not limited to a T-shaped cylinder, and can also be a T-shaped rotating body structure of other shapes; the rotating body structure 11 of the bracket 1 is a necessary structural feature for cooperating with the inner annular surface 21 of the piezoelectric element 2, and the remaining structural features can be provided according to the design requirements of the matching piezoelectric acceleration sensor.

[0058] Figures 2a to 2c This is the first embodiment of the bracket 1. As shown in the figure, in this embodiment, the center of the bracket 1 is provided with a through hole 13 that penetrates the column 11 and the base plate 12. The outer periphery of the base plate 12 of the bracket 1 is provided with a concave assembly groove 14, and the bottom of the base plate 12 forms a convex clamping wall 15. Figures 3a to 3c This is a second embodiment of the bracket 1. As shown in the figure, in this embodiment, the bottom center of the bottom plate 12 of the bracket 1 is provided with a groove 16 arranged toward the column 11, and the bottom periphery of the bottom plate 12 forms a convex clamping wall 15. Figures 4a to 4c This is a third embodiment of the bracket 1 . As shown in the figure, in this embodiment, the bracket 1 is only provided with an outwardly protruding retaining wall 15 at the bottom of the bottom plate 12 . Figures 5a to 5c This is the fourth embodiment of the bracket 1. As shown in the figure, in this embodiment, the bottom center of the bottom plate 12 of the bracket 1 is provided with a groove 16 arranged toward the column 11, the outer periphery of the bottom plate 12 is provided with an inwardly concave assembly groove 14, and the bottom of the bottom plate 12 forms a convex card wall 15.

[0059] like Figures 6a to 9cThe diagrams shown are schematic diagrams of four embodiments of a piezoelectric element 2. The piezoelectric element 2 can be a piezoelectric ceramic, a quartz crystal, or other piezoelectric sensitive element. Both its inner cylindrical surface 21 and outer cylindrical surface 22 are provided with a conductive layer. The piezoelectric element 2 is provided with a structural groove 23 extending through the side wall along its axial direction. The width of the structural groove 23 is not limited to a specific value and can be greater than 0.1 mm. The two opposing end surfaces 231 and 232 of the structural groove 23 or the upper end surface 201 and the lower end surface 202 of the piezoelectric element do not have a conductive layer, or the conductive layer is not conductive with the conductive layer of the inner cylindrical surface 21 and the outer cylindrical surface 22 of the piezoelectric element 2. The piezoelectric element 2 can have a plurality of structural grooves 23 according to actual needs. Figures 6a to 9c In the embodiment shown, the structural groove 23 is a strip groove, but it is not limited to one, nor is it limited to a strip groove. It can also be other groove structures. When ensuring that there is at least one structural groove 23 that passes through the side wall, other structural grooves 23 do not need to pass through the side wall. Figure 6a In the first embodiment of the piezoelectric element 2 shown in FIG6 c , the structural groove 23 of the piezoelectric element 2 is provided with one; Figures 7a to 7c In the second embodiment of the piezoelectric element 2 shown, the piezoelectric element 2 has two structural grooves 23 , and both structural grooves 23 pass through the side wall of the piezoelectric element 2 ; Figures 8a to 8c In the third embodiment of the piezoelectric element 2 shown, the piezoelectric element 2 has two structural grooves 23 , one of which passes through the side wall of the piezoelectric element 2 , and the other does not pass through the side wall of the piezoelectric element 2 . Figures 9a to 9c In the fourth embodiment of the piezoelectric element 2 shown, the piezoelectric element 2 has three structural grooves 23 , and all three structural grooves pass through the side wall of the piezoelectric element 2 .

[0060] like Figures 10a to 15c As shown in the figure, there are six embodiments of the mass block 3. The mass block 3 has an inner annular surface 31 and an outer annular surface 32. The mass block 3 is provided with at least one open groove 33 penetrating the side wall along its axial direction. The opening width of the open groove 33 is not limited to a specific value, and it can be greater than 0.1 mm. A number of open grooves 33 can be provided according to actual needs, and is not limited to one. The open grooves 33 provided are not limited to strip grooves, but can also be other groove structures. After ensuring that there is at least one structural groove 33 penetrating the side wall, the remaining open grooves 33 do not need to completely penetrate the side wall. Figures 10a to 10c In the first embodiment shown, the mass block 3 has two opening grooves 33, one of which penetrates the inner and outer walls of the mass block 3, while the other does not. The outer annular surface 32 of the mass block 3 also has an outer conical surface 34 with a certain degree of taper. The purpose of the outer conical surface 34 is to facilitate interference fit with the clamping collar 4. Figures 11a to 11cIn the second embodiment shown, the mass block 3 has two opening slots 33 , one of which passes through the inner and outer side walls of the mass block 3 , and the other opening slot 33 does not pass through the inner and outer side walls of the mass block 3 ; Figures 12a to 12c In the third embodiment shown, the mass block 3 has three opening grooves 33, one of which passes through the inner and outer walls of the mass block 3, and the other two opening grooves 33 do not pass through the inner and outer walls of the mass block 3. The outer annular surface 32 of the mass block 3 is also provided with an outer conical surface 34 of a certain taper; Figures 13a to 13c In the fourth embodiment shown, the mass block 3 has three opening slots 33, one of which passes through the inner and outer side walls of the mass block 3, and the other two opening slots 33 do not pass through the inner and outer side walls of the mass block; Figures 14a to 14c In the fifth embodiment shown in FIG, the mass block 3 has two opening grooves 33, both of which penetrate the inner and outer side walls of the mass block 3. The outer annular surface 32 of the mass block 3 is also provided with an outer conical surface 34 with a certain taper. Figure 14a to Figure 15c In the sixth embodiment shown, the mass block 3 has two opening slots 33 , and both opening slots 33 pass through the inner and outer side walls of the mass block 3 .

[0061] like Figures 16a to 17c The figure shows two embodiments of the clamping ring 4. The clamping ring 4 has an inner ring surface 41 and an outer ring surface 42. The inner ring surface 41 of the clamping ring 4 and the outer ring surface 32 of the mass block 3 are interference-fitted together. Figures 16a to 16c In the embodiment shown, the inner ring surface 41 of the clamping ring 4 is not provided with an inner conical surface 43. Figures 17a to 17c In the embodiment, the inner annular surface 41 of the clamping ring 4 is provided with an inner conical surface 43.

[0062] The outer conical surface 34 of the mass block 3 and the inner conical surface 43 of the clamping collar 4 serve as guides during assembly. Therefore, in practice, either the outer conical surface 34 of the mass block 3 or the inner conical surface 43 of the clamping collar 4 can be tapered. If the outer conical surface 34 of the mass block 3 is tapered, the clamping collar 4 does not necessarily need to have an inner conical surface 43. If the inner conical surface 43 of the clamping collar 4 is tapered, the outer conical surface 34 of the mass block 3 does not necessarily need to be tapered. Of course, both surfaces can also have tapered surfaces to facilitate assembly of the mass block 3 and the clamping collar 4.

[0063] The present invention involves bracket 1, piezoelectric element 2, mass 3, and clamping ring 4. This invention is not limited to a specific piezoelectric accelerometer; similar components, sizes, shapes, and structures fall within the scope of this invention. The present invention is not limited to the specific implementation steps of the embodiments, and the accompanying drawings are merely schematic. Any structural components that meet assembly requirements, or that are appropriately modified or altered based on the embodiments, shall be deemed to fall within the scope of this invention.

Claims

1. A method for assembling a charge output element, characterized in that: The assembly process of the charge output element is completed at room temperature, including the following steps: Step 1: Place the raising fixture on the bracket; Step 2: Place the inner ring surface of the piezoelectric element on the outer ring surface of the bracket until its bottom surface is flush with the upper surface of the raising fixture; Step 3: Place the inner ring surface of the mass block on the outer ring surface of the piezoelectric element until its bottom surface is flush with the upper surface of the raising fixture; Step 4: Slide the clamping collar onto the outer conical surface of the mass block until its bottom surface contacts the outer conical surface of the mass block. Then, use the jig to apply force along its axial direction until the clamping collar fits against the upper surface of the jig. Once all components are assembled, stop applying force. Step 5: Remove the raising fixture.

2. The method for assembling a charge output element according to claim 1, wherein: The bracket is an inverted T-shaped rotating structure with a base plate and a column. The raising fixture is provided with an opening that is larger than or equal to the bracket column. The opening of the raising fixture is matched on the bracket column, and the bottom surface of the raising fixture is matched on the top surface of the base plate of the bracket.

3. A charge output element assembled using the charge output element assembly method according to claim 1 or 2, characterized in that: include: A support having a rotating structure; a piezoelectric element, the inner annular surface of which is sleeved on the outer annular surface of the bracket, and the piezoelectric element is provided with at least one structural groove penetrating the side wall along its axial direction; a mass block, the inner annular surface of which is sleeved on the outer annular surface of the piezoelectric element, and the mass block is provided with at least one open groove penetrating the side wall along its axial direction; A clamping ring, which is a rotating body structure, the inner ring surface of the clamping ring and the outer ring surface of the mass block are interference fit; a mounting guide structure is provided between the clamping ring and the mass block; and a detachable heightening fixture that fits on the bracket; Among them, the outer ring surface of the mass block is provided with an outer conical surface to form the installation guide structure, so that the clamping ring can be inserted into the outer conical surface of the mass block until its bottom surface contacts the outer conical surface of the mass block, and then the tooling fixture is used to apply force along its axial direction until the clamping ring fits the upper surface of the padding fixture, and all components are assembled in place and the force is stopped.

4. The charge output element according to claim 3, wherein: The bracket is an inverted T-shaped rotating structure with a base plate and a column. The raising fixture is provided with an opening that is larger than or equal to the bracket column. The opening of the raising fixture is matched on the bracket column, and the bottom surface of the raising fixture is matched on the top surface of the base plate of the bracket.

5. The charge output element according to claim 3, wherein: The piezoelectric element has an inner cylindrical surface and an outer cylindrical surface, both of which are provided with a conductive layer. The cross-section of the structural groove of the piezoelectric element or the upper and lower end surfaces of the piezoelectric element has no conductive layer or its conductive layer is not connected to the conductive layer of the inner cylindrical surface and the outer cylindrical surface.

6. The charge output element according to claim 3, wherein: The piezoelectric element is provided with a plurality of structural grooves along its axial direction, and at least one of the structural grooves passes through the side wall of the piezoelectric element.

7. The charge output element according to claim 3, wherein: The mass block is provided with a plurality of opening slots along its axial direction, and at least one of the opening slots passes through the side wall of the mass block.

8. The charge output element according to claim 3, wherein: The clamping ring is a completely closed annular structure.

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