Pressure core welding fixture

Abstract

The application discloses a pressure core welding fixing device, and aims at solving the problem of low yield of the pressure core. The device comprises a clamping mechanism for rotating along the axis thereof, a fixing mechanism coaxial with the clamping mechanism and a force relieving mechanism arranged along the length direction of the clamping mechanism in sequence; the fixing mechanism comprises a positioning seat for fixing the pressure core, and the positioning seat is externally sleeved with a sleeve capable of reciprocating along the axial direction of the positioning seat; the force relieving mechanism comprises a first push rod coaxially arranged with the positioning seat, and a chuck for abutting against the pressure core is rotationally connected to the end of the first push rod close to the positioning seat. The two ends of the pressure core are coaxially pressed through the positioning seat and the first push rod respectively, and meanwhile, the horizontal axial freedom degree is intentionally released, so that the yield is improved.

Description

Technical Field

[0001] This invention relates to the field of welding and fixing device technology, and more specifically, to a pressure core welding and fixing device. Background Technology

[0002] In related technologies, oil-filled silicone piezoresistive pressure cores mainly consist of a pressure ring, a diaphragm, and a sintered base. To ensure internal sealing and achieve pressure transmission, the inner cavity needs to be sealed by welding and filled with silicone oil. The diaphragm thickness used in pressure sensors is typically between 0.02 mm and 0.1 mm, and traditional welding methods are insufficient to meet its precision requirements. However, laser welding, due to its high energy density and small heat-affected zone, has shown excellent results in welding such thin-walled structures and is widely used.

[0003] Technicians believe that the above-mentioned laser welding process has the following defects: the laser welding process requires extremely high stability of the welded parts, it is difficult to maintain high-precision alignment during the rotation welding process, the laser focus cannot be aligned with the weld seam, and problems such as diaphragm light transmission or even ablation are likely to occur, resulting in a decrease in the yield.

[0004] The above problems urgently need to be addressed.

[0005] The above background information does not imply that the applicant accepts it as prior art. Summary of the Invention

[0006] This invention overcomes the low yield of sensors in related technologies by providing a pressure core welding and fixing device, which improves the yield.

[0007] The present invention provides a pressure core welding and fixing device, comprising: a clamping mechanism for rotating along its own axis, and a fixing mechanism and a force relief mechanism coaxial with the clamping mechanism are sequentially provided along the length direction of the clamping mechanism; The fixing mechanism includes a positioning seat for fixing the pressure core, and the positioning seat is fitted with a sleeve that can reciprocate along the axial direction of the positioning seat. The force relief mechanism includes a first push rod, which is coaxially arranged with the positioning seat, and a chuck for abutting the pressure core is rotatably connected to one end of the first push rod near the positioning seat. The positioning seat has a first groove arranged radially therein, and a limiting component is provided in the first groove. The limiting component includes a spring. The first end of the spring abuts against the inner end face of the first groove, and the second end of the spring is provided with a limiting ball. The end of the limiting ball away from the spring extends out of the positioning seat along the first groove and abuts against the inner wall of the sleeve.

[0008] Optionally, the inner wall of the sleeve is provided with at least two sets of second grooves arranged at intervals along its axial direction, the end of the limiting ball away from the spring is inserted into the second groove, and the outer wall of the sleeve is provided with at least two sets of third grooves arranged at intervals along its axial direction.

[0009] Optionally, the pressure core includes a pressure ring, a diaphragm, and a sintered base stacked in sequence. The first end face of the sintered base is tightly fitted with the diaphragm, and the second end face of the sintered base is provided with pins for electrical connection. The end of the pressure ring facing away from the diaphragm is bonded and fixed to the first end face of the positioning seat.

[0010] Optionally, the chuck has a first hole for the pins of the sintering base to pass through, and a rotating bearing is fixedly sleeved on the outer wall of the end of the first push rod near the positioning seat. The first end of the chuck is sleeved on the outside of the rotating bearing, the inner wall of the first end of the chuck is tightly fitted with the outer wall of the rotating bearing, and the second end face of the chuck abuts against the second end face of the sintering base.

[0011] Optionally, the first push rod has a fourth groove arranged along the axial direction of the first push rod at the end opposite to the positioning seat. A piston is provided in the fourth groove. At least one set of fifth grooves arranged along the circumference of the piston is provided on the outer wall of the piston. A sealing ring is sleeved in the fifth groove. The outer wall of the sealing ring fits against the inner wall of the fourth groove. A second push rod is fixed to the end of the piston opposite to the first push rod. The second push rod is connected to a pushing mechanism. The second push rod pushes the first push rod to move axially through the pushing mechanism.

[0012] Optionally, a sixth groove is also formed in the fourth groove along the circumference of the fourth groove, and a retaining spring is engaged in the sixth groove. The retaining spring has an opening inside for the second push rod to pass through.

[0013] Optionally, the pushing mechanism includes a pushing seat, in which a first connecting rod is provided along its length. A second connecting rod is rotatably connected to a first end of the first connecting rod, and a third connecting rod is rotatably connected to a second connecting rod at a second end. The end of the second connecting rod opposite to the first connecting rod is fixed to a second push rod, and the end of the third connecting rod opposite to the first connecting rod is rotatably connected to the pushing seat. The top of the third connecting rod extends upward to form an operating lever. The rotational axes connecting the first, second, and third connecting rods are all perpendicular to the axis of the first push rod and are arranged along the width direction. The rotational axis connecting the third connecting rod to the pushing seat is perpendicular to the axis of the first push rod and is arranged along the width direction.

[0014] Optionally, the first push rod is fitted with a linear bearing, which is coaxially arranged with the positioning seat. The first push rod moves along the linear bearing. A pad is fixed to the bottom of the linear bearing. The pad and the bottom of the push seat are both fixedly installed on the tooling base. The tooling base is used to support the unloading mechanism and the pushing mechanism.

[0015] Optionally, the clamping mechanism includes a bracket, on which a fixed gear plate is rotatably connected. An extension component is clamped inside the fixed gear plate. The extension component includes an extension bar. The first end of the extension bar is clamped and fixed to the fixed gear plate, and the second end of the extension bar is threaded with a collet nut. The collet nut is provided with an elastic collet for clamping the positioning seat.

[0016] Compared with the prior art, the beneficial effects of the present invention are: When fixing the pressure core, the two ends of the pressure core are coaxially pressed together by the positioning seat and the first push rod, respectively. At the same time, its horizontal axial degree of freedom is deliberately released to avoid stress deformation or displacement deviation caused by rigid constraints during rotational welding, ensuring that the laser focus is always aligned with the weld and improving the yield. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of the first embodiment of the present invention. Figure 2 .

[0019] Figure 3 This is an exploded view of the first embodiment of the present invention.

[0020] Figure 4 This is an exploded view of the fixing mechanism, unloading mechanism, and pushing mechanism of the first embodiment of the present invention.

[0021] Figure 5 This is an exploded schematic diagram of the unloading mechanism according to the first embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the pressure core according to the first embodiment of the present invention.

[0023] Figure 7 This is a top view of the first embodiment of the present invention.

[0024] Figure 8 This is the first embodiment of the present invention. Figure 7 A magnified view of a portion of point A in the middle.

[0025] Figure 9 This is the first embodiment of the present invention. Figure 8 Schematic diagram of the cross section at point B.

[0026] Figure 10 This is the first embodiment of the present invention. Figure 9 Enlarged view of a section at point C.

[0027] Figure 11 This is the first embodiment of the present invention. Figure 9 Enlarged view of a section at point D.

[0028] Figure 12 This is a schematic diagram of the assembly of the pressure core and the sleeve in the first embodiment of the present invention.

[0029] In the picture: 1. Clamping mechanism; 11. Bracket; 12. Fixed gear plate; 13. Extension assembly; 131. Extension tool holder; 132. Elastic chuck; 133. Chuck nut; 2. Fixing mechanism; 21. Positioning seat; 211. First groove; 22. Sleeve; 221. Second groove; 222. Third groove; 3. Unloading mechanism; 31. First push rod; 311. Fourth groove; 312. Sixth groove; 32. Second push rod; 33. Chuck; 331. First hole; 34. 35. Snap ring; 351. Piston; 352. Fifth groove; 353. Sealing ring; 4. Pushing mechanism; 41. First connecting rod; 42. Second connecting rod; 43. Third connecting rod; 431. Operating lever; 44. Pushing seat; 5. Linear bearing; 6. Pad; 7. Tooling base; 8. Limiting assembly; 81. Spring; 82. Limiting ball; 9. Pressure core; 91. Pressure ring; 92. Diaphragm; 93. Sintered base; 931. Pin; 10. Rotary bearing. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Similarly, words such as "a" or "one" do not indicate a quantity limitation, but rather indicate the presence of at least one; "multiple" indicates two or more. Unless otherwise stated, words such as "before," "after," "below," and / or "above" are for illustrative purposes only and are not limited to a location or spatial orientation.

[0032] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0036] First Embodiment Please refer to Figures 1 to 11 This embodiment provides a pressure core welding and fixing device.

[0037] The present invention provides a pressure core welding and fixing device, comprising: a clamping mechanism 1 for rotating along its own axis, and a fixing mechanism 2 and a force relief mechanism 3 coaxial with the clamping mechanism 1 arranged sequentially along the length direction of the clamping mechanism 1. The fixing mechanism 2 includes a positioning seat 21 for fixing the pressure core 9, and a sleeve 22 that can reciprocate along the axial direction of the positioning seat 21 is provided on the positioning seat 21. The unloading mechanism 3 includes a first push rod 31, which is coaxially arranged with the positioning seat 21. The end of the first push rod 31 near the positioning seat 21 is rotatably connected to a chuck 33 for abutting the pressure core 9.

[0038] For example, the positioning seat 21 is a coaxial rotating body structure, and its outer wall and the inner wall of the sleeve 22 are fitted with a small clearance. The sleeve 22 can slide smoothly along the axial direction of the positioning seat 21 and switch between the assembly positioning station and the welding station.

[0039] The advantage of this design is that the sleeve 22 can wrap around the side of the positioning seat 21 near the pressure core 9 during the assembly stage, providing radial limit for the stacked assembly of the pressure core 9 and ensuring that all parts are coaxially aligned.

[0040] Please refer to Figure 10 The positioning seat 21 has a first groove 211 arranged radially therein. The first groove 211 is provided with a limiting component 8. The limiting component 8 includes a spring 81. The first end of the spring 81 abuts against the inner end face of the first groove 211. The second end of the spring 81 is provided with a limiting ball 82. The end of the limiting ball 82 away from the spring 81 extends out of the positioning seat 21 along the first groove 211 and abuts against the inner wall of the sleeve 22.

[0041] For example, the first groove 211 is columnar, and the spring 81 extends and retracts along the axial direction of the first groove 211; Under normal conditions, spring 81 pushes the limiting ball 82 outward, causing the spherical part of the limiting ball 82 to protrude from the outer wall of the positioning seat 21 and continuously press against the sleeve 22.

[0042] The advantage of this setup is that the continuous radial preload provided by the spring force of spring 81 can not only provide damping for the axial sliding of sleeve 22 and prevent sleeve 22 from moving freely, but also cooperate with the groove on the inner wall of sleeve 22 to achieve gear engagement and positioning.

[0043] Please refer to Figure 12 The inner wall of the sleeve 22 is provided with at least two sets of second grooves 221 arranged at intervals along its axial direction. The end of the limiting ball 82 away from the spring 81 is inserted into the second groove 221. The outer wall of the sleeve 22 is provided with at least two sets of third grooves 222 arranged at intervals along its axial direction.

[0044] For example, the second groove 221 is an annular groove extending circumferentially along the sleeve 22, and multiple sets of second grooves 221 are arranged axially along the sleeve 22 to correspond to pressure cores 9 of different height specifications; the third groove 222 is also an annular groove, used to increase the external friction of the sleeve 22 and facilitate the movement of the sleeve 22.

[0045] The advantage of this design is that multiple sets of annular grooves form a multi-position axial positioning structure, which can be adapted to pressure cores 9 of different heights and sizes, ensuring that the sleeve 22 is stably engaged at the corresponding work position and will not undergo axial displacement due to rotational vibration.

[0046] Please refer to Figure 6The pressure core 9 includes a pressure ring 91, a diaphragm 92 and a sintered base 93 stacked in sequence. The first end face of the sintered base 93 is tightly fitted with the diaphragm 92. The second end face of the sintered base 93 is provided with pins 931 for electrical connection. The end of the pressure ring 91 facing away from the diaphragm 92 is bonded and fixed to the first end face of the positioning seat 21.

[0047] For example, during assembly, the pressure ring 91, diaphragm 92, and sintered base 93 are stacked sequentially from the outside to the inside onto the first end of the positioning seat 21. The outer end face of the pressure ring 91 is pre-fixed to the end face of the first end of the positioning seat 21 by adhesive. The diaphragm 92 is clamped between the pressure ring 91 and the sintered base 93, and the three are coaxially aligned. In the initial state, the sleeve 22 wraps around the outside of the pressure core 9 and is used for the assembly and positioning of the pressure core 9 components. The specific assembly sequence is: pressure ring 91 → diaphragm 92 → sintered base 93. The diaphragm 92 is located between the pressure ring 91 and the sintered base 93, and radial limiting is achieved by relying on the dimensional tolerance of the inner wall of the sleeve 22.

[0048] The advantage of this setup is that the stacked assembly sequence is clear, the radial limit of sleeve 22 can ensure the coaxiality of the three components, and the adhesive pre-fixation can prevent the parts from shifting during assembly, providing a precise alignment basis for subsequent welding.

[0049] The chuck 33 has a first hole 331 for the pins 931 of the sintering base 93 to pass through. The outer wall of the first push rod 31 near the positioning seat 21 is fixedly fitted with a rotating bearing 10. The first end of the chuck 33 is fitted outside the rotating bearing 10. The inner wall of the first end of the chuck 33 is in close contact with the outer wall of the rotating bearing 10. The second end face of the chuck 33 abuts against the second end face of the sintering base 93.

[0050] For example, the first hole 331 at the center of the chuck 33 is a clearance through hole through which the pin 931 of the sintered base 93 can pass to avoid damage to the pin 931 when pressed; the inner ring of the bearing is fixed to the end of the first push rod 31, and the outer ring is tightly fitted with the inner wall of the chuck 33, so that the chuck 33 can rotate freely about the axis relative to the first push rod 31.

[0051] During laser welding, the chuck 33 and positioning seat 21 rotate synchronously with the pressure core 9, while the first push rod 31 remains stationary. Relying on the static friction of the contact surfaces, it is ensured that there is no relative sliding between the pressure ring 91, diaphragm 92, and sintering base 93. The bearing's own clearance can offset a small amount of shaft alignment error. Clearance refers to the clearance allowance between the inner and outer rings of the bearing and the rolling elements, allowing for slight coaxial deviation and tilting between the inner and outer rings.

[0052] The advantage of this design is that the bearing structure decouples the pushing and rotating functions. The first push rod 31 only transmits axial thrust and does not rotate with the core, reducing rotational resistance and wear of parts. The end-face contact pressing method distributes the force evenly. Combined with the self-adaptive capability of the bearing clearance, it can ensure that the layers of the pressure core 9 are tightly fitted, while avoiding stress deformation caused by rigid constraints, and ensuring that the laser focus is always aligned with the weld.

[0053] Please refer to Figure 11 The first push rod 31 has a fourth groove 311 arranged along the axial direction of the first push rod 31 at the end opposite to the positioning seat 21. A piston 35 is provided in the fourth groove 311. At least one set of fifth grooves 351 arranged along the circumference of the piston 35 is opened on the outer wall of the piston 35. A sealing ring 352 is sleeved in the fifth groove 351. The outer wall of the sealing ring 352 fits against the inner wall of the fourth groove 311. A second push rod 32 is fixed at the end of the piston 35 opposite to the first push rod 31. The second push rod 32 is connected to the pushing mechanism 4. The second push rod 32 pushes the first push rod 31 to move axially through the pushing mechanism 4.

[0054] For example, after the piston 35 is inserted into the fourth groove 311, the sealing ring 352 on the outer wall fits tightly against the inner wall of the fourth groove 311, forming a sealed air cavity between the piston 35 and the fourth groove 311, thus constituting an air spring structure; the thrust output by the pushing mechanism 4 is smoothly transmitted to the first push rod 31 through the second push rod 32, the piston 35, and the sealed air cavity, and then the first push rod 31 pushes the pressure core 9 towards the positioning seat 21.

[0055] The advantage of this design is that the air spring formed by the sealed air chamber can buffer the instantaneous impact force during clamping, allowing the axial thrust to be released slowly. For ultra-thin film sheets 92 with a thickness of only 0.02mm-0.1mm, it can effectively avoid deformation or damage caused by rapid clamping impact. At the same time, the pressure equalization characteristics of the air chamber can ensure the centering accuracy of the push rod, so that the top pressure is evenly applied to the end face of the core.

[0056] The fourth groove 311 also has a sixth groove 312 that runs circumferentially around the fourth groove 311. A retaining spring 34 is engaged in the sixth groove 312, and the retaining spring 34 has an opening inside for the second push rod 32 to pass through.

[0057] For example, the sixth groove 312 is an annular groove near the opening of the inner wall of the fourth groove 311. After the snap ring 34 is inserted into the sixth groove 312, its inner ring diameter is smaller than the outer diameter of the piston 35, which can prevent the piston 35 from coming out of the fourth groove 311. The second push rod 32 can pass freely through the through hole of the inner ring of the snap ring 34 without affecting the axial transmission.

[0058] The advantage of this design is that the snap ring 34 has a simple structure and is easy to install and remove. It can limit the backward travel of the piston 35, preventing the piston 35 from slipping out when the push rod is released after the operation, thus improving the reliability and safety of the device.

[0059] The pushing mechanism 4 includes a pushing seat 44, in which a first connecting rod 41 is provided along the length direction. A second connecting rod 42 is rotatably connected to the first end of the first connecting rod 41, and a third connecting rod 43 is rotatably connected to the second end of the first connecting rod 41. The end of the second connecting rod 42 facing away from the first connecting rod 41 is fixed to a second push rod 32. The end of the third connecting rod 43 facing away from the first connecting rod 41 is rotatably connected to the pushing seat 44. The top of the third connecting rod 43 extends upward to form an operating lever 431. The rotation axis connecting the first connecting rod 41, the second connecting rod 42, and the third connecting rod 43 is perpendicular to the axis of the first push rod 31 and is arranged along the width direction. The rotation axis connecting the third connecting rod 43 and the pushing seat 44 is perpendicular to the axis of the first push rod 31 and is arranged along the width direction.

[0060] For example, all of the above-mentioned rotary connection methods are hinged, wherein the first connecting rod 41, the second connecting rod 42, and the third connecting rod 43 together form a linkage transmission mechanism. By moving the operating lever 431, the third connecting rod 43 can be driven to rotate around its hinge axis with the push seat 44, thereby driving the second push rod 32 to move back and forth along the axial direction through the first connecting rod 41, so as to realize the forward pressing and backward release of the first push rod 31.

[0061] The advantages of this setup are that the manual linkage mechanism is easy to operate and the stroke is controllable, achieving stable axial pressing without the need for an additional power source; all hinge shafts are arranged along the width direction, the transmission plane is coplanar with the push rod axis, resulting in high force transmission efficiency, no lateral force component, and ensuring the coaxiality of the push rod operation.

[0062] The first push rod 31 is fitted with a linear bearing 5. The linear bearing 5 is coaxially arranged with the positioning seat 21. The first push rod 31 moves along the linear bearing 5. A pad 6 is fixed at the bottom of the linear bearing 5. The pad 6 and the bottom of the push seat 44 are both fixedly installed on the tooling base 7. The tooling base 7 is used to support the unloading mechanism 3 and the pushing mechanism 4.

[0063] For example, the linear bearing 5 provides radial support and axial sliding guidance for the first push rod 31, ensuring that the push rod moves smoothly back and forth along the fixed axis; the pad 6 is used to raise the linear bearing 5, compensate for the height difference between the linear bearing 5 and the push mechanism 4, and ensure that the two are coaxial; the tooling base 7 is the overall installation reference, and the height of the base can be adjusted to match the axis height of the clamping mechanism 1.

[0064] The advantage of this setup is that the linear bearing 5 has high guiding accuracy and low motion resistance, which can ensure that there is no radial wobble when the push rod is pressed down; the pad 6 is used to match the coaxiality between the linear bearing 5 and the push mechanism 4; the tooling base 7 is height adjustable and is used to match the coaxiality between the push mechanism 4 and the fixed gear plate 12, thereby reducing rotational runout from the structural basis and avoiding the influence of laser focal length changes on weld quality.

[0065] The clamping mechanism 1 includes a bracket 11, on which a fixed gear plate 12 is rotatably connected. An extension component 13 is clamped inside the fixed gear plate 12. The extension component 13 includes an extension bar 131. The first end of the extension bar 131 is clamped and fixed to the fixed gear plate 12, and the second end of the extension bar 131 is threaded with a collet nut 133. The collet nut 133 is provided with an elastic collet 132 for clamping the positioning seat 21.

[0066] Specifically, the inner wall of the collet nut 133 is provided with an annular locking boss extending circumferentially, and the outer wall of the elastic collet 132 is provided with an annular groove. The elastic collet 132 engages with the locking boss of the collet nut 133 through the annular groove. The elastic collet 132 performs radial opening and closing action along the locking boss through the annular groove to match and clamp positioning seats 21 of different diameters.

[0067] In addition, the middle section of the positioning seat 21 extends outward to form a stop, which abuts against the end face of the collet nut 133.

[0068] For example, the fixed gear disc 12 is driven by an external motor to rotate around its own axis, which is completely coincident with the axis of the positioning seat 21. The elastic chuck 132 is truncated cone-shaped with a diameter that gradually decreases axially towards the extension bar 131 on the side near the extension bar 131, and its outer wall is a tapered mating surface; the extension bar 131 has a corresponding matching inner tapered hole at the corresponding position. When the chuck nut 133 is tightened, the locking boss drives the elastic chuck 132 to move axially backward through the annular groove, and the tapered surface is squeezed by the inner tapered hole. The elastic chuck 132 contracts radially inward and hugs the outer wall of the positioning seat 21; when the chuck nut 133 is loosened, the elastic chuck 132 springs back and opens, thus releasing the positioning seat 21.

[0069] The advantage of this design is that the conical locking structure of the elastic chuck 132 has a large clamping force and high coaxiality, which can ensure that the positioning seat 21 rotates synchronously with the fixed gear plate 12 without relative slippage or radial runout; the engagement of the snap-fit ​​boss and the annular groove can realize the axial linkage between the chuck nut 133 and the elastic chuck 132, making the screwing operation smooth and the clamping efficiency high.

[0070] Specifically, during use, the various parts of the pressure core 9 are first stacked into the sleeve 22, and pre-fixation is completed by the pressing and engagement of the positioning seat 21 and the first push rod 31. After fixing, move the sleeve 22 to the left to completely expose the weld between the pressure ring 91 and the sintered base 93 for subsequent laser welding; In addition, the gear plate rotates around its own axis, which drives the elastic chuck 132 to rotate. The elastic chuck 132 clamps the positioning seat 21 to ensure coaxiality during rotation and avoid the impact of axial runout on the laser focal length change during laser welding, which affects the weld quality. During welding, the operating lever 431 is moved to the left, causing the third connecting rod 43 connected to the operating lever 431 to rotate counterclockwise. This sequentially moves the first connecting rod 41 and the second push rod 32 to the left, pushing the piston 35 to slide within the fourth groove 311. The air spring formed between the piston 35 and the fourth groove 311 slowly releases the thrust, preventing impact damage to the pressure core 9. Simultaneously, the first push rod 31 provides a stable horizontal thrust to the left, ensuring a tight fit between the pressure ring 91 of the pressure core 9 and the sintering base 93. This guarantees a seamless connection between the layers during rotary welding and prevents laser light from burning the diaphragm 92.

[0071] After welding is completed, move the operating lever 431 to the right, and the third connecting rod 43 will rotate clockwise, which will drive the second push rod 32 and the first push rod 31 to move back to the right in sequence, and the chuck 33 will separate from the sintering base 93; loosen the chuck nut 133 to remove the sleeve 22, the positioning seat 21 and the welded pressure core 9 together, and complete the quick clamping.

[0072] Please refer to Figure 10 and Figure 12 The quick clamping design of this application is achieved through the following structure: the sleeve 22 can move left and right and can be used for the assembly and positioning of the pressure core 9. When the sleeve 22 is moved to the left until the weld of the pressure core 9 is completely exposed, it is in the working state. After welding, the sleeve 22 is moved to the right to fix the pressure core 9. The operating rod 431 is rotated to the right, and the third connecting rod 43 connected to the operating rod 431 rotates clockwise, thereby driving the second connecting rod 42, the first connecting rod 41 and the second push rod 32 to move to the right in sequence, so that the chuck 33 is separated from the sintering base 93. Loosening the chuck nut 133 can remove the sleeve 22, the positioning seat 21 and the pressure core 9 together.

[0073] Second Embodiment Unlike the first embodiment, in this embodiment, the push seat 44 is equipped with a pneumatic clamp, which drives the second push rod 32 to reciprocate axially.

[0074] For example, the telescopic rod of the pneumatic clamp is coaxially connected to the second push rod 32. After compressed air is introduced, the telescopic rod extends and pushes the second push rod 32 forward, causing the first push rod 31 to press against the pressure core 9. After the air is exhausted, the telescopic rod retracts, causing the second push rod 32 to move backward and release. During clamping, the pneumatic clamp drives the second push rod 32 to push the first push rod 31, pressing and fixing the pressure core 9. Then, the sleeve 22 is manually moved to the left until the gap to be welded between the pressure ring 91 on the pressure core 9 and the sintering base 93 is completely exposed, and then the gap is laser welded.

[0075] The advantage of this setup is that the pneumatic drive clamping speed is fast and the thrust is stable, which can further improve the efficiency of batch welding operations and is suitable for continuous operation scenarios in mass production lines. At the same time, the pneumatic output thrust has good consistency, which can ensure that the clamping pressure of different workpieces is uniform and improve the consistency of product welding quality.

[0076] Third Embodiment Unlike the first embodiment, in this embodiment, the fifth groove 351 is preferably in two sets, and the sealing ring 352 is an O-ring seal 352.

[0077] For example, two annular fifth grooves 351 are opened axially on the outer wall of the piston 35, and an O-ring rubber seal 352 is installed in each groove. The two seals 352 together form a dynamic seal with the inner wall of the fourth groove 311.

[0078] The advantage of this design is that the double O-ring rubber seal 352 has a more reliable sealing performance, can better maintain the pressure of the sealed air chamber, and ensure the stable buffering effect of the air spring. The O-ring 352 is a standard part, which has low procurement cost and is easy to replace, thus reducing the later maintenance cost of the equipment.

[0079] Fourth embodiment Unlike the first embodiment, in this embodiment, the axial position and number of the third groove 222 correspond to the second groove 221.

[0080] Specifically, the third groove 222 and the inner second groove 221 are radially aligned, allowing the engagement position of the limiting ball 82 to be visually determined from the outside. Alternatively, the top pin can be inserted to push the limiting ball 82 back, thereby unlocking and sliding the sleeve 22.

[0081] The advantage of this design is that the external third slot 222 also allows for visualization of the positioning status of the internal second slot 221, making disassembly and adjustment more convenient.

[0082] In related technologies, laser welding utilizes high-energy laser pulses to locally heat a small area of ​​material. The laser energy diffuses into the material through heat conduction, causing localized melting to form a specific molten pool. However, the laser welding process demands extremely high stability from the welded area, ensuring no relative movement to prevent energy dissipation or sudden increases due to laser focus shift. Simultaneously, the welded area must be exposed to ensure good heat dissipation, supplemented by a shielding gas to guarantee a beautiful weld formation free of ablation defects.

[0083] Technicians believe that although the welding fixture can ensure that the components of the pressure core 9 do not shift relative to each other during the welding process, it is difficult to maintain high-precision alignment during the rotational welding process, resulting in a low yield and problems such as light transmission or even ablation of the diaphragm 92.

[0084] To address the aforementioned problems, this invention proposes a pressure core welding and fixing device. This device utilizes the dimensional tolerances of the inner wall of the sleeve 22 to limit the positioning of the pressure ring 91, diaphragm 92, and sintering base 93, achieving rapid and precise positioning of the three components. The pressure core 9 fixing mechanism 2 clamps the core and releases its horizontal axial degree of freedom. Furthermore, a force-relieving mechanism 3 is provided to ensure that the core is not damaged by impact forces during rapid clamping, thereby improving welding quality and yield.

[0085] In summary, this application has at least the following advantages: First, it abandons the traditional tooling model that can only clamp and fix, and uses the dimensional tolerance of the inner wall of the sleeve 22 to limit the position of the pressure ring 91, diaphragm 92 and sintered base 93. This design not only ensures coaxiality, but also realizes the rapid assembly and precise positioning of the three, thus improving assembly efficiency.

[0086] Secondly, while the pressure core 9 is clamped by the fixing mechanism 2, its horizontal axial degree of freedom is deliberately released. This avoids stress deformation or displacement deviation caused by rigid constraints during rotational welding, ensuring that the laser focus is always aligned with the weld.

[0087] Third, considering the vulnerability of the diaphragm 92 (with a thickness of 0.02mm-0.1mm), a stress relief mechanism 3 is set up to relieve stress. During rapid clamping, the air spring composed of the fourth groove 311 and the piston 35 buffers and absorbs the impact force, preventing the diaphragm 92 from deforming or being damaged due to instantaneous force, thus significantly improving the yield rate.

[0088] Fourth, the inner wall of the sleeve 22 is designed with multiple sets of second grooves 221 to form a multi-segment limiting structure, ensuring that the device is compatible with pressure cores 9 of different heights.

[0089] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure core welding and fixing device, characterized in that, include: A clamping mechanism (1) for rotating along its own axis is provided with a fixing mechanism (2) and a force-relieving mechanism (3) coaxial with the clamping mechanism (1) along the length direction of the clamping mechanism (1). The fixing mechanism (2) includes a positioning seat (21) for fixing the pressure core (9), and the positioning seat (21) is fitted with a sleeve (22) that can reciprocate along the axial direction of the positioning seat (21). The unloading mechanism (3) includes a first push rod (31), which is coaxially arranged with the positioning seat (21). The end of the first push rod (31) near the positioning seat (21) is rotatably connected to a chuck (33) for abutting the pressure core (9). The positioning seat (21) has a first groove (211) arranged radially therein. The first groove (211) is provided with a limiting component (8). The limiting component (8) includes a spring (81). The first end of the spring (81) abuts against the inner end face of the first groove (211). The second end of the spring (81) is provided with a limiting ball (82). The end of the limiting ball (82) away from the spring (81) extends out of the positioning seat (21) along the first groove (211) and abuts against the inner wall of the sleeve (22).

2. The pressure core welding and fixing device according to claim 1, characterized in that, The inner wall of the sleeve (22) is provided with at least two sets of second grooves (221) arranged at intervals along its axial direction. The end of the limiting ball (82) away from the spring (81) is inserted into the second groove (221). The outer wall of the sleeve (22) is provided with at least two sets of third grooves (222) arranged at intervals along its axial direction.

3. A pressure core welding and fixing device according to claim 1 or 2, characterized in that, The pressure core (9) includes a pressure ring (91), a diaphragm (92) and a sintered base (93) stacked in sequence. The first end face of the sintered base (93) is tightly fitted to the diaphragm (92). The second end face of the sintered base (93) is provided with pins (931) for electrical connection. The end of the pressure ring (91) facing away from the diaphragm (92) is bonded and fixed to the first end face of the positioning seat (21).

4. The pressure core welding and fixing device according to claim 3, characterized in that, The chuck (33) has a first hole (331) for the pin (931) of the sintering base (93) to pass through. The outer wall of the first push rod (31) near the positioning seat (21) is fixedly fitted with a rotating bearing (10). The first end of the chuck (33) is fitted outside the rotating bearing (10). The inner wall of the first end of the chuck (33) is in close contact with the outer wall of the rotating bearing (10). The second end face of the chuck (33) abuts against the second end face of the sintering base (93).

5. The pressure core welding and fixing device according to claim 4, characterized in that, The first push rod (31) has a fourth groove (311) arranged along the axial direction of the first push rod (31) at one end away from the positioning seat (21). A piston (35) is provided in the fourth groove (311). At least one set of fifth grooves (351) arranged along the circumference of the piston (35) is opened on the outer wall of the piston (35). A sealing ring (352) is sleeved in the fifth groove (351). The outer wall of the sealing ring (352) is in contact with the inner wall of the fourth groove (311). A second push rod (32) is fixed at one end of the piston (35) away from the first push rod (31). The second push rod (32) is connected to the pushing mechanism (4). The second push rod (32) pushes the first push rod (31) to move axially through the pushing mechanism (4).

6. The pressure core welding and fixing device according to claim 5, characterized in that, The fourth groove (311) also has a sixth groove (312) that is circumferentially opened along the fourth groove (311). A retaining ring (34) is engaged in the sixth groove (312). The retaining ring (34) has an opening inside for the second push rod (32) to pass through.

7. The pressure core welding and fixing device according to claim 5, characterized in that, The pushing mechanism (4) includes a pushing seat (44), in which a first connecting rod (41) is provided along the length direction. A second connecting rod (42) is rotatably connected to the first end of the first connecting rod (41), and a third connecting rod (43) is rotatably connected to the second end of the first connecting rod (41). The end of the second connecting rod (42) away from the first connecting rod (41) is fixed to the second push rod (32). The end of the third connecting rod (43) away from the first connecting rod (41) is rotatably connected to the pushing seat (44). The top of the third connecting rod (43) extends upward to form an operating lever (431). The rotation axis directions of the first connecting rod (41), the second connecting rod (42), and the third connecting rod (43) are all perpendicular to the axis of the first push rod (31) and arranged along the width direction. The rotation axis direction of the third connecting rod (43) and the pushing seat (44) is perpendicular to the axis of the first push rod (31) and arranged along the width direction.

8. The pressure core welding and fixing device according to claim 7, characterized in that, The first push rod (31) is fitted with a linear bearing (5), which is coaxially arranged with the positioning seat (21). The first push rod (31) moves along the linear bearing (5). A pad (6) is fixed at the bottom of the linear bearing (5). The pad (6) and the bottom of the push seat (44) are both fixedly installed on the tooling base (7). The tooling base (7) is used to support the unloading mechanism (3) and the push mechanism (4).

9. The pressure core welding and fixing device according to claim 1, characterized in that, The clamping mechanism (1) includes a bracket (11), on which a fixed gear plate (12) is rotatably connected. An extension component (13) is clamped inside the fixed gear plate (12). The extension component (13) includes an extension bar (131). The first end of the extension bar (131) is clamped and fixed to the fixed gear plate (12). The second end of the extension bar (131) is threaded with a collet nut (133). The collet nut (133) is provided with an elastic collet (132) for clamping the positioning seat (21).

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