A cup-shaped vibrating gyroscope welding tool

Abstract

The application discloses a cup-shaped vibration gyroscope welding tool, which comprises a base, a stand column fixed at four corners of the base, a cover plate sleeved on the stand column, a plurality of mounting holes and at least one first circular positioning hole concentrically arranged in the center of the cover plate, the mounting holes corresponding to welding grooves of pressure strain gauges at the bottom of a resonator of the cup-shaped vibration gyroscope one by one, and the first circular positioning hole corresponding to one of the circular holes at the bottom of the resonator of the cup-shaped vibration gyroscope; a circular ring-shaped boss is arranged at the center of the lower end surface of the cover plate, the inner diameter of the circular ring-shaped boss is matched with the outer diameter of the resonator of the cup-shaped vibration gyroscope, and the circular ring-shaped boss is concentrically arranged at the periphery of the mounting holes and the first circular positioning hole; a lead wire avoiding groove and a second circular positioning hole are arranged on the upper end surface of the base, and the second circular positioning hole is located at the outer side of the lead wire avoiding groove; and a pressing block is inserted into the mounting hole. Through the tool, one-time welding of the cup-shaped vibration gyroscope is realized, the welding quality is improved, and the welding efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of cup-shaped vibrating gyroscope resonator welding technology, specifically to a cup-shaped vibrating gyroscope welding fixture. Background Technology

[0002] The cup-shaped vibration gyroscope uses a high-factor cup-shaped metal resonator as the resonant structure and piezoelectric electrodes as the excitation and detection elements, improving the gyroscope's sensitivity and shock resistance. Eight pressure strain gauges are uniformly bonded to the bottom surface of the resonator to excite and detect the vibration of the resonator under different simulated states; please refer to [link to relevant documentation]. Figures 4-5 Eight welding grooves are evenly distributed across the bottom of the resonator at a 360° angle, with a positional error of less than 0.05 mm. Pressure strain gauges are welded into these grooves. After the strain gauges are welded, the resonator is then welded into the mounting holes of the gyroscope base, forming a cup-shaped vibrating gyroscope. The cup-shaped vibrating gyroscope resonator is made of a high-elasticity alloy and is a typical thin-walled component. Due to the functional characteristics of the resonant sensor, the symmetry of the welding positions of the eight pressure strain gauges at the bottom of the resonator is extremely important. It is crucial to ensure both the reliability of the strain gauge welding and that the positional error after welding is less than 0.05 mm. Large positional errors in the strain gauge welding can lead to a higher sensor breakage frequency and mode shape shift, resulting in poor performance of the cup-shaped vibrating gyroscope.

[0003] Traditional welding methods generally employ a two-stage welding process. In the first welding, the resonator and pressure strain gauge are placed in a eutectic furnace for welding. In the second welding, the resonator and base are placed in the eutectic furnace for welding again. Both welding processes require heating the eutectic furnace to the same temperature, which can compromise the reliability of the first welding during the second welding. Furthermore, the two welding processes require heating and cooling the eutectic furnace twice, which is time-consuming and inefficient. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, the present invention provides a welding fixture for a cup-shaped vibrating gyroscope.

[0005] The technical problem to be solved by this invention is achieved through the following technical solution:

[0006] A welding fixture for a cup-shaped vibrating gyroscope includes a base with columns fixed at its four corners. A cover plate is fitted onto each column. The cover plate has a plurality of mounting holes and at least one first circular positioning hole arranged concentrically in a ring at its center. The mounting holes correspond one-to-one with the welding grooves for the pressure strain gauges at the bottom of the cup-shaped vibrating gyroscope's resonator. The first circular positioning hole corresponds to one of the circular holes at the bottom of the cup-shaped vibrating gyroscope's resonator. A circular boss is located at the center of the lower end face of the cover plate. The inner diameter of the circular boss matches the outer diameter of the cup-shaped vibrating gyroscope's resonator, and the circular boss is concentrically located around the mounting holes and the first circular positioning hole. A lead wire clearance groove and a second circular positioning hole are provided on the upper end face of the base, with the second circular positioning hole located outside the lead wire clearance groove. A pressure block is inserted into each mounting hole.

[0007] Furthermore, the shape of the mounting hole is consistent with the shape of the pressure strain gauge of the cup-shaped vibrating gyroscope resonator, and the gap between the wall of the mounting hole and the pressure strain gauge is less than 0.03 mm.

[0008] Furthermore, the lower end of the pressure block is adapted to the shape of the mounting hole, and the upper end is cylindrical, with the outer diameter of the cylinder being larger than the width of the mounting hole.

[0009] Furthermore, a pressure plate is provided above the pressure block.

[0010] Furthermore, the pressure plate is fixed to the cover plate by screws.

[0011] The beneficial effects of this invention are:

[0012] 1. This invention designs a cover plate and fits it onto the bottom surface of the cup-shaped vibrating gyroscope resonator. A pressure strain gauge is placed in the welding groove of the pressure strain gauge coated with solder paste on the bottom surface of the resonator through the mounting hole on the cover plate. A pressure block and a pressure plate are used to apply pre-pressure to it. The base of the cup-shaped vibrating gyroscope is placed on the base of the welding fixture and fixed. The cup-shaped gyroscope resonator is inserted into the mounting hole of the base coated with solder paste through the central column, forming the whole assembly to be welded. The fixture and the assembly to be welded are then placed in a eutectic furnace to complete the welding.

[0013] 2. By utilizing the tooling of this invention, the cup-shaped vibrating gyroscope can be welded in one go, eliminating the problem of traditional methods requiring two welding operations that interfere with and damage each other. This not only improves the welding quality but also significantly increases the welding efficiency, resulting in a marked improvement in the product qualification rate.

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of the present invention (this schematic diagram is a schematic diagram of the tooling in use, and the cup-shaped vibrating gyroscope is not shown in this figure);

[0016] Figure 2 This is a schematic diagram of the bottom structure of the cover plate;

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the bottom (with pressure block) of the cover plate;

[0018] Figure 4 This is a schematic diagram of the bottom structure of the resonator of a cup-shaped vibrating gyroscope.

[0019] Figure 5 This is a schematic cross-sectional view of a cup-shaped vibrating gyroscope.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Base; 2-Column; 3-Cover plate; 4-Cup-shaped vibrating gyroscope resonator; 5-Pressure strain gauge welding groove; 6-Round hole; 7-Pressure strain gauge; 8-Cup-shaped vibrating gyroscope base; 9-Pressure block; 10-Pressure plate; 11-Screw; 12-Cup-shaped vibrating gyroscope base mounting hole; 13-Resonator column; 1-1-Second circular positioning hole; 1-2-Lead wire clearance groove; 3-1-Mounting hole; 3-2-First circular positioning hole; 3-3-Annular boss; 3-4-First threaded hole. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0023] Please see Figures 1-5This invention provides a welding fixture for a cup-shaped vibrating gyroscope, specifically including a base 1. Four columns 2 are fixed at the four corners of the base 1. A cover plate 3 is fitted onto each column 2. The cover plate 3 has a plurality of mounting holes 3-1 and four first circular positioning holes 3-2 arranged concentrically in the center. The mounting holes 3-1 correspond one-to-one with the welding grooves 5 of the pressure strain gauges at the bottom of the cup-shaped vibrating gyroscope resonator 4, and the four first circular positioning holes 3-2 correspond to four circular holes 6 at the bottom of the cup-shaped vibrating gyroscope resonator 4. The lower end face of the cover plate 3 has a circular boss 3-3 at its center. The inner diameter of the annular boss 3-3 is adapted to the outer diameter of the cup-shaped vibrating gyroscope resonator 4, and the annular boss 3-3 is concentrically located around the mounting hole 3-1 and the first circular positioning hole 3-2; the cup-shaped vibrating gyroscope is placed between the cover plate 3 and the base 1, and the bottom surface of the cup-shaped vibrating gyroscope resonator 4 faces upward. The annular boss 3-3 is fitted around the bottom of the cup-shaped vibrating gyroscope resonator 4, and the mounting hole 3-1 and the first circular positioning hole 3-2 are respectively opposite to and attached to the pressure strain gauge welding groove 5 and the circular hole 6 on the bottom surface of the cup-shaped vibrating gyroscope resonator 4. After the first circular positioning hole 3-2 is aligned with the circular hole 6 and temporarily positioned by a pin, the mounting hole 3-1 and the pressure strain gauge welding groove 5 can also ensure accurate positioning. Then, the pressure strain gauge 7 is placed into the pressure strain gauge welding groove 5 through the mounting hole 3-1. The shape of the mounting hole 3-1 is consistent with the shape of the pressure strain gauge 7 of the cup-shaped vibrating gyroscope resonator 4. When the pressure strain gauge 7 enters the mounting hole 3-1, the gap between the pressure strain gauge 7 and the hole wall of the mounting hole is less than 0.03mm, thus ensuring that the positional error of the pressure strain gauge after welding is less than 0.05mm.

[0024] In addition, to facilitate the positioning of the cup-shaped vibrating gyroscope base 8, a second circular positioning hole 1-1 is provided on the upper end face of the welding fixture base 1. The hole on the cup-shaped vibrating gyroscope base 8 and the second circular positioning hole 1-1 are temporarily positioned by a positioning pin to realize the positioning of the cup-shaped vibrating gyroscope base. At the same time, in order to avoid damaging the lead wire at the lower end of the cup-shaped vibrating gyroscope base 8 during installation and welding, a lead wire clearance groove 1-2 is provided on the upper end face of the welding fixture base 1. The lead wire at the lower end of the cup-shaped vibrating gyroscope base 8 is located in the lead wire clearance groove 1-2.

[0025] Furthermore, to ensure that the pressure strain gauge does not tilt due to the deformation of the solder paste during welding, thus affecting the positional accuracy, a pressure block 9 is inserted into the mounting hole 3-1. The lower end of the pressure block 9 is adapted to the shape of the mounting hole 3-1, and the upper end is cylindrical, with the outer diameter of the cylinder being larger than the width of the mounting hole 3-1. During welding, the lower end of the pressure block 9 presses against the pressure strain gauge 7, thereby applying a certain pre-pressure to the pressure strain gauge.

[0026] Furthermore, to prevent insufficient weight of the pressure block 9 from compromising the accuracy of the strain gauge position during welding, a pressure plate 10 is placed above the pressure block 9. The cover plate 3 and the pressure plate 10 each have a first threaded hole 3-4 and a second threaded hole. The pressure plate 10 is connected to the cover plate 3 by screws 11 connected to the first threaded hole 3-4 and the second threaded hole, thereby applying a certain pre-pressure to the strain gauge 7 through the pressure plate 10 to prevent the strain gauge from sliding and tilting, which would increase the positional error.

[0027] The process of using this cup-shaped vibrating gyroscope welding fixture is as follows:

[0028] First, after applying solder paste to the mounting holes 12 of the cup-shaped gyroscope base and the welding groove 5 of the resonator pressure strain gauge, the resonator 4 of the cup-shaped gyroscope is inserted into the mounting holes 12 of the cup-shaped gyroscope base through the central resonator column 13 to form a cup-shaped gyroscope assembly. Then, the cup-shaped gyroscope assembly is mounted on the base 1 of the welding fixture, and the cup-shaped gyroscope base 8 is temporarily positioned through the second circular positioning hole 1-1 on the welding fixture base 1. Finally, the cover plate 3 is positioned through the columns 2 around the base 1. The fitting is attached to the outer periphery of the guiding ring of the cup-shaped vibrating gyroscope resonator 4. After temporary positioning through the first circular positioning hole 3-2 on the cover plate 3 and the circular hole 6 on the bottom surface of the cup-shaped vibrating gyroscope resonator 4, the pressure strain gauge 7 is placed in the pressure strain gauge welding groove 5 on the bottom surface of the resonator through the mounting hole 3-1 on the cover plate 3. The pressure block 9 is pressed against the pressure strain gauge 7, and then the pressure plate 10 is pressed onto the pressure block 9. The screws 11 are fixed in the threaded holes in the middle of the cover plate 3 and the pressure plate 10, fixing the cover plate 3 and the pressure plate 10 together. After installation, the welding fixture is placed in the eutectic furnace. After the eutectic furnace is evacuated, it is heated to 230°C. The temperature is conducted through the base 1 and the cover plate 3 of the welding fixture to the mounting hole 12 of the cup-shaped vibrating gyroscope base and the pressure strain gauge welding groove 5, respectively, melting the solder paste inside. After cooling, the welding of the cup-shaped vibrating gyroscope is completed. By using this disposable welding fixture, the problem of traditional methods requiring two welding operations that interfere with and damage each other is eliminated, thus improving welding quality and, in particular, significantly increasing welding efficiency.

[0029] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A cup-shaped vibrating gyroscope welding fixture, characterized by, The device includes a base with columns fixed at its four corners. A cover plate is fitted onto each column. The cover plate has several mounting holes and at least one first circular positioning hole arranged concentrically in a ring at its center. The mounting holes correspond one-to-one with the welding grooves of the pressure strain gauges at the bottom of the cup-shaped gyroscope resonator. The first circular positioning hole corresponds to one of the circular holes at the bottom of the cup-shaped gyroscope resonator. A circular boss is located at the center of the lower end face of the cover plate. The inner diameter of the circular boss matches the outer diameter of the cup-shaped gyroscope resonator, and the circular boss is concentrically located around the mounting holes and the first circular positioning hole. The upper end face of the base has a lead wire clearance groove and a second circular positioning hole, with the second circular positioning hole located outside the lead wire clearance groove. A pressure block is inserted into each mounting hole. The shape of the mounting hole is consistent with the shape of the pressure strain gauge of the cup-shaped vibrating gyroscope resonator, and the gap between the wall of the mounting hole and the pressure strain gauge is less than 0.03 mm; the lower end of the pressure block is adapted to the shape of the mounting hole, the upper end is cylindrical, and the outer diameter of the cylinder is greater than the width of the mounting hole.

2. The cup-shaped vibratory gyroscope welding fixture of claim 1, wherein, A pressure plate is provided above the pressure block.

3. The cup-shaped vibratory gyroscope welding fixture of claim 2, wherein, The pressure plate is fixed to the cover plate by screws.

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