A riveting device for pressure sensor

Abstract

The utility model provides a pressure sensor riveting device for pressure sensor's shell and base connection fixed, the one end of shell is connected with base, including the top post, drives linear movement through drive assembly, the lateral wall of base and shell junction is provided with the clamping hole, the top post is coaxial with clamping hole, the top post applies pressure to the outside surface of shell, makes shell form the convex block that protrudes inwards, the convex block is clamped with clamping hole. Adopt mechanical riveting to replace high accuracy laser welding, need not to depend on high power laser equipment and precision alignment system, significantly reduce equipment investment and process complexity, solved the problem that traditional full welding led, more fit the working condition characteristics of supermicro sensor low intensity demand.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, specifically a pressure sensor riveting device. Background Technology

[0002] Pressure sensors, which convert pressure signals into electrical signals, are widely used in industrial control, automotive, medical equipment, and many other fields. They typically consist of a sensing chip, signal processing circuitry, housing, and base.

[0003] Currently, the industry commonly uses laser welding technology to fully weld the housing to the base for pressure sensors of standard size. Full welding creates a continuous and complete weld seam, thus providing extremely high structural strength.

[0004] However, with the rapid development of the Internet of Things, portable devices, and miniature actuators (such as ultra-miniature braking systems), there is a growing demand for miniaturization of pressure sensors. In applications of such ultra-miniature brake pressure sensors (XFF), the internal pressure chamber is small, the medium pressure is relatively low, and the installation environment is typically mild. Traditional full-welding mounting methods exhibit the following significant drawbacks in this context: First, for products such as ultra-miniature brake pressure sensors, the actual operating conditions require welding strength far lower than the strength that full welding can provide. Adopting a full welding solution leads to over-design in terms of performance. At the same time, to achieve precise and continuous full welding, high-precision, high-power laser welding equipment is required, which directly results in high production costs.

[0005] Secondly, the laser welding process concentrates a large amount of heat, forming a long, continuous weld seam. For miniature, thin-walled sensor structures, this concentrated heat input can easily lead to significant thermal stress and deformation in the housing or base, potentially causing damage to internal components or deformation of the packaging cavity. Ultimately, this affects the accuracy and reliability of the sensor, reducing product yield.

[0006] Therefore, existing connection methods between the housing and the base, when applied to ultra-miniature pressure sensors, suffer from high costs, excessively demanding manufacturing processes, and potential performance degradation due to heat. There is an urgent need for a housing fixing solution suitable for ultra-miniature pressure sensors that can ensure connection strength while effectively reducing costs and minimizing the heat impact of welding. Utility Model Content

[0007] To address the technical problems in the background art, this utility model discloses a pressure sensor riveting device.

[0008] This utility model provides a pressure sensor riveting device for connecting and fixing the housing and base of a pressure sensor. One end of the housing is sleeved onto the base, including a top column, and is driven to move linearly by a drive assembly. The side wall at the connection between the base and the outer shell is provided with snap-fit ​​holes; The top post is coaxial with the snap-fit ​​hole; The top pillar applies pressure to the outer surface of the casing, causing the casing to form an inwardly convex bump; The protrusion engages with the snap-fit ​​hole.

[0009] Furthermore, the snap-fit ​​holes are arranged in two symmetrical positions.

[0010] Furthermore, the drive assembly includes a bidirectional lead screw, one end of which is driven to rotate by a drive motor; Both the positive and negative leads of the bidirectional lead screw are equipped with lead screw nuts; Each top column is fixedly connected to a lead screw nut.

[0011] Furthermore, the top post is installed on the top block; The top block is fixedly connected to the lead screw nut; A pressure sensor is installed on the top block.

[0012] Furthermore, it also includes a clamp, which is provided with positioning holes; The lower end of the base is engaged in the positioning hole.

[0013] Furthermore, a cylinder is also provided on the upper side of the outer casing; The drive end of the cylinder faces downwards and is connected to a pressure block; The pressure block is used to press the outer casing downwards.

[0014] Furthermore, a hydraulic damper is also installed on the pressure block; Before the pressure block moves down and contacts the outer casing, the hydraulic damper first contacts the fixed support.

[0015] Furthermore, one side of the positioning hole is open and sealed with a sealing plate; The sealing plate is elastically connected by a spring.

[0016] Furthermore, it also includes a displacement sensor, the detection end of which is connected to the pressure block.

[0017] The beneficial effects of this utility model are: 1. Mechanical riveting is used to replace high-precision laser welding, eliminating the need for high-power laser equipment and precision alignment systems. This significantly reduces equipment investment and process complexity, solves the problems caused by traditional full welding, and better meets the working conditions of low-strength requirements of ultra-miniature sensors.

[0018] 2. Cold forming completely avoids welding heat input, fundamentally eliminating cavity deformation or internal component damage caused by thermal stress and thermal deformation, ensuring sensor accuracy and long-term reliability, and effectively improving product yield. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a structural schematic diagram of the fixture, top column, pressure block, pressure sensor housing, and base. Figure 4 yes Figure 3 The main view; Figure 5 yes Figure 4 Sectional view of AA; Figure 6 yes Figure 3 Schematic diagram of the fixture's concealed top plate; Figure 7 It is a front sectional view of the connection structure of the top column, shell and base; Figure 8 yes Figure 7 Enlarged view of point B in the middle; In the diagram: 1. Outer shell; 2. Base; 3. Top column; 4. Snap-fit ​​hole; 5. Protrusion; 6. Two-way lead screw; 7. Drive motor; 8. Lead screw nut; 9. Fixture; 10. Positioning hole; 11. Cylinder; 12. Pressure block; 13. Hydraulic buffer; 14. Support component; 15. Sealing plate; 16. Spring; 17. Top block; 18. Pressure sensor; 19. Displacement sensor; 20. Mounting box; 21. Protrusion plate; 22. First linear guide rail; 23. Connecting block; 24. Forming block; 25. Rear plate; 26. Second linear guide rail; 27. Top plate. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] like Figure 1 and Figure 2 As shown, and with Figure 2For reference, this utility model discloses a pressure sensor riveting device for connecting and fixing the housing 1 and base 2 of a pressure sensor, with the lower end of the housing 1 sleeved onto the upper end of the base 2. The side wall at the connection point between the base 2 and the housing 1 is provided with two radially extending, symmetrically arranged snap-fit ​​holes 4.

[0023] This embodiment includes a rectangular mounting box 20 with an opening on its front side. A clamp 9 is bolted to the rear plate 25 of the mounting box 20. The clamp 9 has an upwardly extending positioning hole 10. The lower end of the base 2 is engaged within the positioning hole 10 for positioning and limiting the base 2. To improve the positional stability of the base 2, one side of the upper end of the positioning hole 10 is open, forming an arc shape at the end face of the opening. This opening is sealed by a sealing plate 15, which is elastically connected by a spring 16, so that the plane of the sealing plate 15 exerts pressure on the base 2. The sealing plate 15 is L-shaped, with a horizontal upper end for sealing the notch in the positioning hole 10, and a connecting part at the lower end through which a bolt passes, connecting to the clamp 9. The spring 16 is sleeved on the bolt, with one end abutting the head of the bolt and the other end abutting the connecting part, achieving an elastic connection between the sealing plate 15 and the clamp 9.

[0024] like Figure 3-6 As shown, parallel and symmetrically arranged protruding plates 21 extend outward from both sides of the notch of the clamp 9, forming a limiting groove between the protruding plates 21, and the sealing plate 15 is engaged in the limiting groove. A top plate 27 is also installed on the upper end of the protruding plate 21, and the upper end of the sealing plate 15 abuts against the top plate 27. This improves the stability of the movement of the sealing plate 15 under the limiting action of the protruding plates 21 and the top plate 27.

[0025] The rear plate 25 is also equipped with a horizontally arranged first linear guide rail 22. The first linear guide rail 22 is provided with two sliders, and each slider is fixedly connected to a connecting block 23 located on both sides of the clamp 9. A top block 17 is provided on the side of the connecting block 23 near the clamp 9. A top post 3 coaxial with the snap-fit ​​hole 4 is installed on the inner side of the top block 17.

[0026] A horizontally arranged bidirectional lead screw 6 is mounted on the rear plate 25 below the first linear guide 22. The bidirectional lead screw 6 is movably connected to the rear plate 25 via a bearing with a mounting seat. The right end of the bidirectional lead screw 6 is fixedly connected to the drive end of the drive motor 7 via a coupling. In this embodiment, the drive motor 7 is a combination of a servo motor and a planetary reducer. Lead screw nuts 8 are threaded onto both the forward and reverse leads of the bidirectional lead screw 6, and connecting blocks 23 are fixedly connected to one lead screw nut 8 respectively. When the drive motor 7 starts, it can drive the top column 3 to synchronously approach or move away from the clamp 9. A raised, spherical forming block 24 is provided at the end of the top column 3 near the clamp 9. Figure 7 and Figure 6As shown, when the base 2 with the outer shell 1 attached is engaged in the engagement hole 4, the drive motor 7 drives the top column 3 to move towards the clamp 9 at the same time, and drives the outer shell 1 to deform into the engagement hole 4, thereby forming a spherical protrusion 5 that is engaged in the engagement hole 4, thus completing the engagement and fixation of the outer shell 1 and the base 2.

[0027] Because there is a gap between the bidirectional lead screw 6 and the lead screw nut 8, the outer shell 1 may be over-deformed or under-deformed. Therefore, a pressure sensor 18 is also provided between the connecting block 23 and the top block 17. When the actual pressure reaches the set pressure, the outer shell 1 and the base 2 are engaged.

[0028] Because the outer shell 1 is fitted onto the base 2, the position of the outer shell 1 is unstable, and it is easy for the outer shell 1 to fail to engage properly. Therefore, a cylinder 11 with its drive end facing downwards is also installed at the upper end of the rear plate 25. A pressure block 12 is installed at the drive end of the cylinder 11. When the pressure block 12 moves downwards, it applies downward pressure to the top of the outer shell 1, thereby improving the engagement accuracy between the outer shell 1 and the base 2. A vertically arranged second linear guide rail 26 is also installed on the rear plate 25. The pressure block 12 is fixedly connected to the slider on the second linear guide rail 26 to improve the movement stability of the pressure block 12.

[0029] Because the piston rod of cylinder 11 moves downwards at a relatively fast speed, it will impact the upper end of the outer casing 1, causing deformation and damage to the outer casing 1. Therefore, a hydraulic damper 13 is also installed on the pressure block 12, and a support member 14 located directly below the hydraulic damper 13 is installed on the rear plate 25. Before the pressure block 12 moves downwards and contacts the outer casing 1, the buffer rod on the hydraulic damper 13 first contacts the fixed support member 14, thereby cushioning the downward pressure of the pressure block 12.

[0030] Because the length of the outer shell 1 does not match the set length, this type of outer shell 1 is considered a defective product that does not meet the usage requirements. In order to detect such defective products, a displacement sensor 19 is also installed on the rear plate 25. Its detection end is connected to the pressure block 12 to detect the distance that the pressure block 12 moves down. The outer shell 1 is then judged to be qualified based on this distance.

[0031] Compared to existing technologies, the advantages of this embodiment are: 1. It uses mechanical riveting instead of high-precision laser welding, eliminating the need for high-power laser equipment and precision alignment systems, significantly reducing equipment investment and process complexity, solving the problems caused by traditional full welding, and better meeting the low-strength requirements of ultra-miniature sensors. 2. Cold-working riveting completely avoids welding heat input, fundamentally eliminating cavity deformation or internal component damage caused by thermal stress and thermal deformation, ensuring sensor accuracy and long-term reliability, and effectively improving product yield.

[0032] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pressure sensor riveting device for connecting and fixing a housing (1) and a base (2) of a pressure sensor, wherein one end of the housing (1) is sleeved onto the base (2), characterized in that: Including the top column (3), which is driven to move linearly through the drive component; The side wall at the connection between the base (2) and the outer shell (1) is provided with a snap-fit ​​hole (4); The top post (3) is coaxial with the snap-fit ​​hole (4); The top post (3) applies pressure to the outer surface of the outer shell (1), causing the outer shell (1) to form an inwardly protruding bump (5). The protrusion (5) engages with the snap-fit ​​hole (4).

2. The pressure sensor riveting device according to claim 1, characterized in that: The snap-fit ​​holes (4) are arranged in two symmetrical arrangements.

3. The pressure sensor riveting device according to claim 2, characterized in that: The drive assembly includes a bidirectional lead screw (6), one end of which is driven to rotate by a drive motor (7); Both the positive and negative leads of the bidirectional lead screw (6) are provided with lead screw nuts (8). The top column (3) is fixedly connected to a lead screw nut (8).

4. The pressure sensor riveting device according to claim 3, characterized in that: The top post (3) is installed on the top block (17); The top block (17) is fixedly connected to the lead screw nut (8); A pressure sensor (18) is installed on the top block (17).

5. The pressure sensor riveting device according to claim 1, characterized in that: It also includes a clamp (9) having a positioning hole (10); The lower end of the base (2) is engaged in the positioning hole (10).

6. The pressure sensor riveting device according to claim 5, characterized in that: A cylinder (11) is also provided on the upper side of the outer casing (1). The driving end of the cylinder (11) faces downward and is connected to a pressure block (12). The pressure block (12) is used to press the outer shell (1) down.

7. A pressure sensor riveting device according to claim 6, characterized in that: A hydraulic damper (13) is also installed on the pressure block (12); Before the pressure block (12) moves down and contacts the outer shell (1), the hydraulic buffer (13) preferentially contacts the fixed support (14).

8. A pressure sensor riveting device according to claim 5, characterized in that: The positioning hole (10) has an opening on one side and is sealed with a sealing plate (15). The sealing plate (15) is elastically connected by a spring (16).

9. A pressure sensor riveting device according to claim 6, characterized in that: It also includes a displacement sensor (19), whose detection end is connected to the pressure block (12).

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